diff --git a/static/lib/codemirror/AUTHORS b/static/lib/codemirror/AUTHORS
index 67fd2fd..2ac995f 100644
--- a/static/lib/codemirror/AUTHORS
+++ b/static/lib/codemirror/AUTHORS
@@ -2,243 +2,646 @@
 
 4r2r
 Aaron Brooks
+Abdelouahab
+Abe Fettig
+Adam Ahmed
 Adam King
+Adam Particka
 adanlobato
 Adán Lobato
+Adrian Aichner
+Adrian Heine
+Adrien Bertrand
 aeroson
 Ahmad Amireh
 Ahmad M. Zawawi
 ahoward
 Akeksandr Motsjonov
+Alasdair Smith
+Alberto González Palomo
+Alberto Pose
 Albert Xing
 Alexander Pavlov
 Alexander Schepanovski
+Alexander Shvets
+Alexander Solovyov
+Alexandre Bique
 alexey-k
 Alex Piggott
+Aliaksei Chapyzhenka
+Allen Sarkisyan
+Ami Fischman
+Amin Shali
+Amin Ullah Khan
+amshali@google.com
+Amsul
+amuntean
 Amy
 Ananya Sen
+anaran
+AndersMad
+Anders Nawroth
+Anderson Mesquita
+Anders Wåglund
+Andrea G
+Andreas Reischuck
+Andres Taylor
 Andre von Houck
+Andrew Cheng
+Andrey Fedorov
+Andrey Klyuchnikov
 Andrey Lushnikov
+Andrey Shchekin
+Andy Joslin
 Andy Kimball
 Andy Li
+Angelo
 angelozerr
 angelo.zerr@gmail.com
+Ankit
 Ankit Ahuja
 Ansel Santosa
+Anthony Dugois
+anthonygego
+Anthony Gégo
 Anthony Grimes
+Anton Kovalyov
+Apollo Zhu
+AQNOUCH Mohammed
 areos
+Arnab Bose
+Arthur Müller
+Arun Narasani
+as3boyan
+atelierbram
+AtomicPages LLC
 Atul Bhouraskar
 Aurelian Oancea
+Axel Lewenhaupt
+Barret Rennie
+Basarat Ali Syed
 Bastian Müller
+belhaj
+Bem Jones-Bey
 benbro
+Beni Cherniavsky-Paskin
 Benjamin DeCoste
 Ben Keen
+Ben Miller
+Ben Mosher
+Bernhard Sirlinger
+Bert Chang
+Bharad
+BigBlueHat
+Billy Moon
+binny
+B Krishna Chaitanya
+Blaine G
+blukat29
 boomyjee
 borawjm
+Brad Metcalf
 Brandon Frohs
+Brandon Wamboldt
+Brett Zamir
+Brian Grinstead
 Brian Sletten
+brrd
 Bruce Mitchener
+Bryan Massoth
+Caitlin Potter
+Calin Barbat
+callodacity
+Camilo Roca
+Chad Jolly
 Chandra Sekhar Pydi
 Charles Skelton
+Cheah Chu Yeow
 Chris Coyier
+Chris Ford
 Chris Granger
+Chris Houseknecht
+Chris Lohfink
 Chris Morgan
+Chris Smith
+Christian Oyarzun
+Christian Petrov
 Christopher Brown
+Christopher Kramer
+Christopher Mitchell
+Christopher Pfohl
+Chunliang Lyu
+ciaranj
 CodeAnimal
+coderaiser
+Cole R Lawrence
 ComFreek
+Curtis Gagliardi
 dagsta
+daines
+Dale Jung
+Dan Bentley
 Dan Heberden
 Daniel, Dao Quang Minh
+Daniele Di Sarli
 Daniel Faust
 Daniel Huigens
+Daniel Kesler
+Daniel KJ
 Daniel Neel
 Daniel Parnell
 Danny Yoo
+darealshinji
+Darius Roberts
+Dave Brondsema
+Dave Myers
+David Barnett
+David H. Bronke
 David Mignot
 David Pathakjee
+David Vázquez
+David Whittington
 deebugger
 Deep Thought
+Devin Abbott
+Devon Carew
+Dick Choi
+dignifiedquire
+Dimage Sapelkin
+Dmitry Kiselyov
+domagoj412
 Dominator008
 Domizio Demichelis
+Doug Wikle
 Drew Bratcher
 Drew Hintz
 Drew Khoury
+Drini Cami
 Dror BG
 duralog
+eborden
 edsharp
 ekhaled
+Elisée
+Emmanuel Schanzer
+Enam Mijbah Noor
 Eric Allam
+Erik Welander
 eustas
+Fabien Dubosson
+Fabien O'Carroll
+Fabio Zendhi Nagao
+Faiza Alsaied
 Fauntleroy
 fbuchinger
 feizhang365
 Felipe Lalanne
 Felix Raab
+ficristo
 Filip Noetzel
+Filip Stollár
 flack
+Florian Felten
+ForbesLindesay
+Forbes Lindesay
 Ford_Lawnmower
+Forrest Oliphant
+Frank Wiegand
+Gabriel Gheorghian
+Gabriel Horner
 Gabriel Nahmias
 galambalazs
+Gary Sheng
 Gautam Mehta
+Gavin Douglas
+gekkoe
+Geordie Hall
+geowarin
+Gerard Braad
+Gergely Hegykozi
+Giovanni Calò
+Glebov Boris
+Glenn Jorde
 Glenn Ruehle
 Golevka
+Google Inc.
 Gordon Smith
+Grant Skinner
 greengiant
+Gregory Koberger
+Grzegorz Mazur
 Guillaume Massé
+Guillaume Massé
+guraga
+Gustavo Rodrigues
+Hakan Tunc
 Hans Engel
 Hardest
+Harshvardhan Gupta
 Hasan Karahan
+Hector Oswaldo Caballero
+Hendrik Wallbaum
+Herculano Campos
+Hiroyuki Makino
+hitsthings
 Hocdoc
+Hugues Malphettes
 Ian Beck
+Ian Dickinson
 Ian Wehrman
 Ian Wetherbee
 Ice White
 ICHIKAWA, Yuji
+idleberg
+ilvalle
 Ingo Richter
 Irakli Gozalishvili
 Ivan Kurnosov
+Ivoah
 Jacob Lee
+Jake Peyser
+Jakob Miland
 Jakub Vrana
+Jakub Vrána
 James Campos
+James Howard
 James Thorne
 Jamie Hill
+Jamie Morris
 Jan Jongboom
 jankeromnes
 Jan Keromnes
+Jan Odvarko
+Jan Schär
 Jan T. Sott
+Jared Dean
+Jared Forsyth
+Jared Jacobs
 Jason
+Jason Barnabe
 Jason Grout
 Jason Johnston
 Jason San Jose
 Jason Siefken
+Jaydeep Solanki
 Jean Boussier
+Jeff Blaisdell
+Jeff Jenkins
 jeffkenton
 Jeff Pickhardt
 jem (graphite)
+Jeremy Parmenter
+Jim
+Jim Avery
+JobJob
+jochenberger
 Jochen Berger
+Joel Einbinder
+joelpinheiro
+Johan Ask
 John Connor
+John-David Dalton
+John Engler
 John Lees-Miller
 John Snelson
+John Van Der Loo
+Jon Ander Peñalba
+Jonas Döbertin
+Jonathan Malmaud
+Jon Gacnik
 jongalloway
+Jon Malmaud
+Jon Sangster
 Joost-Wim Boekesteijn
 Joseph Pecoraro
+Josh Barnes
+Josh Cohen
+Josh Soref
 Joshua Newman
+Josh Watzman
 jots
+jsoojeon
+ju1ius
 Juan Benavides Romero
 Jucovschi Constantin
+Juho Vuori
+Julien Rebetez
+Justin Andresen
+Justin Hileman
 jwallers@gmail.com
 kaniga
+karevn
+Kayur Patel
+Kazuhito Hokamura
 Ken Newman
+ken restivo
 Ken Rockot
+Kevin Earls
+Kevin Muret
 Kevin Sawicki
+Kevin Ushey
 Klaus Silveira
 Koh Zi Han, Cliff
 komakino
 Konstantin Lopuhin
 koops
+Kris Ciccarello
 ks-ifware
+kubelsmieci
+KwanEsq
+Kyle Kelley
+Lanfei
 Lanny
+Laszlo Vidacs
 leaf corcoran
+Leonid Khachaturov
+Leon Sorokin
 Leonya Khachaturov
 Liam Newman
-List of contributors. Updated before every release.
+Libo Cannici
+LloydMilligan
 LM
+lochel
 Lorenzo Stoakes
+Luca Fabbri
+Luciano Longo
+Lu Fangjian
+Luke Browning
+Luke Granger-Brown
+Luke Stagner
 lynschinzer
+M1cha
+Madhura Jayaratne
 Maksim Lin
 Maksym Taran
+Malay Majithia
+Manideep
+Manuel Rego Casasnovas
 Marat Dreizin
+Marcel Gerber
+Marcelo Camargo
 Marco Aurélio
+Marco Munizaga
+Marcus Bointon
+Marek Rudnicki
 Marijn Haverbeke
+Mário Gonçalves
 Mario Pietsch
+Mark Anderson
 Mark Lentczner
+Marko Bonaci
+Mark Peace
+Markus Bordihn
+Martin Balek
+Martín Gaitán
+Martin Hasoň
+Martin Hunt
+Martin Laine
+Martin Zagora
 Mason Malone
 Mateusz Paprocki
+Mathias Bynens
 mats cronqvist
+Matt Gaide
+Matthew Bauer
 Matthew Beale
+matthewhayes
+Matthew Rathbone
+Matthias Bussonnier
 Matthias BUSSONNIER
 Matt McDonald
 Matt Pass
 Matt Sacks
+mauricio
 Maximilian Hils
+Maxim Kraev
 Max Kirsch
+Max Schaefer
+Max Xiantu
 mbarkhau
+McBrainy
+mce2
+melpon
 Metatheos
 Micah Dubinko
+Michael
+Michael Goderbauer
+Michael Grey
+Michael Kaminsky
 Michael Lehenbauer
 Michael Zhou
+Michal Dorner
 Mighty Guava
 Miguel Castillo
+mihailik
 Mike
 Mike Brevoort
 Mike Diaz
 Mike Ivanov
 Mike Kadin
+Mike Kobit
 MinRK
+Miraculix87
 misfo
+mkaminsky11
+mloginov
+Moritz Schwörer
 mps
+ms
+mtaran-google
+Mu-An Chiou
 Narciso Jaramillo
 Nathan Williams
+ndr
 nerbert
+nextrevision
+ngn
 nguillaumin
+Ng Zhi An
+Nicholas Bollweg
+Nicholas Bollweg (Nick)
+Nick Kreeger
+Nick Small
+Nicolò Ribaudo
 Niels van Groningen
+nightwing
 Nikita Beloglazov
 Nikita Vasilyev
+Nikolay Kostov
+nilp0inter
+Nisarg Jhaveri
 nlwillia
+noragrossman
+Norman Rzepka
+Oreoluwa Onatemowo
+Oskar Segersvärd
 pablo
+pabloferz
+Pablo Zubieta
 Page
+Panupong Pasupat
+paris
+Paris
+Paris Kasidiaris
+Patil Arpith
+Patrick Stoica
 Patrick Strawderman
 Paul Garvin
 Paul Ivanov
+Paul Masson
+Pavel
 Pavel Feldman
+Pavel Petržela
+Pavel Strashkin
 Paweł Bartkiewicz
 peteguhl
+peter
+Peter Flynn
 peterkroon
 Peter Kroon
+Philipp A
+Philip Stadermann
+Pierre Gerold
+Piët Delport
+Pontus Melke
 prasanthj
 Prasanth J
+Prayag Verma
+Radek Piórkowski
 Rahul
+Rahul Anand
+ramwin1
+Randall Mason
+Randy Burden
 Randy Edmunds
+Rasmus Erik Voel Jensen
+ray ratchup
+Ray Ratchup
+Remi Nyborg
+Renaud Durlin
+Richard Denton
+Richard van der Meer
 Richard Z.H. Wang
+Rishi Goomar
+Robert Crossfield
+Roberto Abdelkader Martínez Pérez
 robertop23
 Robert Plummer
+Rrandom
+Rrrandom
 Ruslan Osmanov
+Ryan Petrello
+Ryan Prior
 sabaca
+Sam Lee
 Samuel Ainsworth
+Sam Wilson
 sandeepshetty
+Sander AKA Redsandro
+Sander Verweij
 santec
 Sascha Peilicke
+satamas
 satchmorun
 sathyamoorthi
+Saul Costa
+S. Chris Colbert
 SCLINIC\jdecker
+Scott Aikin
+Scott Goodhew
+Sebastian Zaha
+Sergey Goder
+Sergey Tselovalnikov
+Se-Won Kim
 shaund
 shaun gilchrist
+Shawn A
+Shea Bunge
+sheopory
+Shiv Deepak
 Shmuel Englard
+Shubham Jain
+Siamak Mokhtari
+silverwind
+sinkuu
+snasa
+soliton4
 sonson
 spastorelli
+srajanpaliwal
+Stanislav Oaserele
 Stas Kobzar
 Stefan Borsje
 Steffen Beyer
+Steffen Bruchmann
+Stephen Lavelle
+Steve Champagne
+Steve Hoover
 Steve O'Hara
+stoskov
+Stu Kennedy
+Sungho Kim
+sverweij
+Taha Jahangir
+takamori
+Tako Schotanus
+Takuji Shimokawa
 Tarmil
+TDaglis
+tel
 tfjgeorge
 Thaddee Tyl
+thanasis
+TheHowl
+themrmax
 think
 Thomas Dvornik
+Thomas Kluyver
 Thomas Schmid
+Tim Alby
 Tim Baumann
 Timothy Farrell
+Timothy Gu
 Timothy Hatcher
+TobiasBg
+Todd Berman
+Tomas-A
 Tomas Varaneckas
 Tom Erik Støwer
+Tom Klancer
 Tom MacWright
 Tony Jian
+Travis Heppe
+Triangle717
+Tristan Tarrant
+TSUYUSATO Kitsune
+twifkak
+VapidWorx
 Vestimir Markov
 vf
+Victor Bocharsky
+Vincent Woo
 Volker Mische
+Weiyan Shao
+wenli
+Wes Cossick
+Wesley Wiser
+Will Binns-Smith
+Will Dean
 William Jamieson
+William Stein
+Willy
 Wojtek Ptak
+Wu Cheng-Han
 Xavier Mendez
+Yassin N. Hassan
+YNH Webdev
 Yunchi Luo
 Yuvi Panda
+Zac Anger
 Zachary Dremann
+Zeno Rocha
+Zhang Hao
+Ziv
+zziuni
+魏鹏刚
diff --git a/static/lib/codemirror/LICENSE b/static/lib/codemirror/LICENSE
index ade341c..ff7db4b 100644
--- a/static/lib/codemirror/LICENSE
+++ b/static/lib/codemirror/LICENSE
@@ -1,4 +1,6 @@
-Copyright (C) 2013 by Marijn Haverbeke <marijnh@gmail.com> and others
+MIT License
+
+Copyright (C) 2017 by Marijn Haverbeke <marijnh@gmail.com> and others
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -17,7 +19,3 @@
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
-
-Please note that some subdirectories of the CodeMirror distribution
-include their own LICENSE files, and are released under different
-licences.
diff --git a/static/lib/codemirror/README.md b/static/lib/codemirror/README.md
index 61f6b64..3328e3b 100644
--- a/static/lib/codemirror/README.md
+++ b/static/lib/codemirror/README.md
@@ -1,11 +1,34 @@
 # CodeMirror
-[![Build Status](https://secure.travis-ci.org/marijnh/CodeMirror.png?branch=master)](http://travis-ci.org/marijnh/CodeMirror)
-[![NPM version](https://badge.fury.io/js/codemirror.png)](http://badge.fury.io/js/codemirror)
+[![Build Status](https://travis-ci.org/codemirror/CodeMirror.svg)](https://travis-ci.org/codemirror/CodeMirror)
+[![NPM version](https://img.shields.io/npm/v/codemirror.svg)](https://www.npmjs.org/package/codemirror)
+[![Join the chat at https://gitter.im/codemirror/CodeMirror](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/codemirror/CodeMirror)  
+[Funding status: ![maintainer happiness](https://marijnhaverbeke.nl/fund/status_s.png?again)](https://marijnhaverbeke.nl/fund/)
 
-CodeMirror is a JavaScript component that provides a code editor in
-the browser. When a mode is available for the language you are coding
-in, it will color your code, and optionally help with indentation.
+CodeMirror is a versatile text editor implemented in JavaScript for
+the browser. It is specialized for editing code, and comes with over
+100 language modes and various addons that implement more advanced
+editing functionality.
 
-The project page is http://codemirror.net  
-The manual is at http://codemirror.net/doc/manual.html  
-The contributing guidelines are in [CONTRIBUTING.md](https://github.com/marijnh/CodeMirror/blob/master/CONTRIBUTING.md)
+A rich programming API and a CSS theming system are available for
+customizing CodeMirror to fit your application, and extending it with
+new functionality.
+
+You can find more information (and the
+[manual](http://codemirror.net/doc/manual.html)) on the [project
+page](http://codemirror.net). For questions and discussion, use the
+[discussion forum](https://discuss.codemirror.net/).
+
+See
+[CONTRIBUTING.md](https://github.com/codemirror/CodeMirror/blob/master/CONTRIBUTING.md)
+for contributing guidelines.
+
+The CodeMirror community aims to be welcoming to everybody. We use the
+[Contributor Covenant
+(1.1)](http://contributor-covenant.org/version/1/1/0/) as our code of
+conduct.
+
+### Quickstart
+
+To build the project, make sure you have Node.js installed (at least version 6)
+and then `npm install`. To run, just open `index.html` in your
+browser (you don't need to run a webserver). Run the tests with `npm test`.
diff --git a/static/lib/codemirror/lib/codemirror.css b/static/lib/codemirror/lib/codemirror.css
index c95db64..b962b38 100644
--- a/static/lib/codemirror/lib/codemirror.css
+++ b/static/lib/codemirror/lib/codemirror.css
@@ -4,10 +4,7 @@
   /* Set height, width, borders, and global font properties here */
   font-family: monospace;
   height: 300px;
-}
-.CodeMirror-scroll {
-  /* Set scrolling behaviour here */
-  overflow: auto;
+  color: black;
 }
 
 /* PADDING */
@@ -36,65 +33,115 @@
   min-width: 20px;
   text-align: right;
   color: #999;
+  white-space: nowrap;
 }
 
+.CodeMirror-guttermarker { color: black; }
+.CodeMirror-guttermarker-subtle { color: #999; }
+
 /* CURSOR */
 
-.CodeMirror div.CodeMirror-cursor {
+.CodeMirror-cursor {
   border-left: 1px solid black;
-  z-index: 3;
+  border-right: none;
+  width: 0;
 }
 /* Shown when moving in bi-directional text */
 .CodeMirror div.CodeMirror-secondarycursor {
   border-left: 1px solid silver;
 }
-.CodeMirror.cm-keymap-fat-cursor div.CodeMirror-cursor {
+.cm-fat-cursor .CodeMirror-cursor {
   width: auto;
-  border: 0;
+  border: 0 !important;
   background: #7e7;
+}
+.cm-fat-cursor div.CodeMirror-cursors {
   z-index: 1;
 }
-/* Can style cursor different in overwrite (non-insert) mode */
-.CodeMirror div.CodeMirror-cursor.CodeMirror-overwrite {}
 
-.cm-tab { display: inline-block; }
+.cm-animate-fat-cursor {
+  width: auto;
+  border: 0;
+  -webkit-animation: blink 1.06s steps(1) infinite;
+  -moz-animation: blink 1.06s steps(1) infinite;
+  animation: blink 1.06s steps(1) infinite;
+  background-color: #7e7;
+}
+@-moz-keyframes blink {
+  0% {}
+  50% { background-color: transparent; }
+  100% {}
+}
+@-webkit-keyframes blink {
+  0% {}
+  50% { background-color: transparent; }
+  100% {}
+}
+@keyframes blink {
+  0% {}
+  50% { background-color: transparent; }
+  100% {}
+}
+
+/* Can style cursor different in overwrite (non-insert) mode */
+.CodeMirror-overwrite .CodeMirror-cursor {}
+
+.cm-tab { display: inline-block; text-decoration: inherit; }
+
+.CodeMirror-rulers {
+  position: absolute;
+  left: 0; right: 0; top: -50px; bottom: -20px;
+  overflow: hidden;
+}
+.CodeMirror-ruler {
+  border-left: 1px solid #ccc;
+  top: 0; bottom: 0;
+  position: absolute;
+}
 
 /* DEFAULT THEME */
 
-.cm-s-default .cm-keyword {color: #708;}
-.cm-s-default .cm-atom {color: #219;}
-.cm-s-default .cm-number {color: #164;}
-.cm-s-default .cm-def {color: #00f;}
-.cm-s-default .cm-variable {color: black;}
-.cm-s-default .cm-variable-2 {color: #05a;}
-.cm-s-default .cm-variable-3 {color: #085;}
-.cm-s-default .cm-property {color: black;}
-.cm-s-default .cm-operator {color: black;}
-.cm-s-default .cm-comment {color: #a50;}
-.cm-s-default .cm-string {color: #a11;}
-.cm-s-default .cm-string-2 {color: #f50;}
-.cm-s-default .cm-meta {color: #555;}
-.cm-s-default .cm-error {color: #f00;}
-.cm-s-default .cm-qualifier {color: #555;}
-.cm-s-default .cm-builtin {color: #30a;}
-.cm-s-default .cm-bracket {color: #997;}
-.cm-s-default .cm-tag {color: #170;}
-.cm-s-default .cm-attribute {color: #00c;}
 .cm-s-default .cm-header {color: blue;}
 .cm-s-default .cm-quote {color: #090;}
-.cm-s-default .cm-hr {color: #999;}
-.cm-s-default .cm-link {color: #00c;}
-
 .cm-negative {color: #d44;}
 .cm-positive {color: #292;}
 .cm-header, .cm-strong {font-weight: bold;}
 .cm-em {font-style: italic;}
 .cm-link {text-decoration: underline;}
+.cm-strikethrough {text-decoration: line-through;}
 
+.cm-s-default .cm-keyword {color: #708;}
+.cm-s-default .cm-atom {color: #219;}
+.cm-s-default .cm-number {color: #164;}
+.cm-s-default .cm-def {color: #00f;}
+.cm-s-default .cm-variable,
+.cm-s-default .cm-punctuation,
+.cm-s-default .cm-property,
+.cm-s-default .cm-operator {}
+.cm-s-default .cm-variable-2 {color: #05a;}
+.cm-s-default .cm-variable-3 {color: #085;}
+.cm-s-default .cm-comment {color: #a50;}
+.cm-s-default .cm-string {color: #a11;}
+.cm-s-default .cm-string-2 {color: #f50;}
+.cm-s-default .cm-meta {color: #555;}
+.cm-s-default .cm-qualifier {color: #555;}
+.cm-s-default .cm-builtin {color: #30a;}
+.cm-s-default .cm-bracket {color: #997;}
+.cm-s-default .cm-tag {color: #170;}
+.cm-s-default .cm-attribute {color: #00c;}
+.cm-s-default .cm-hr {color: #999;}
+.cm-s-default .cm-link {color: #00c;}
+
+.cm-s-default .cm-error {color: #f00;}
 .cm-invalidchar {color: #f00;}
 
+.CodeMirror-composing { border-bottom: 2px solid; }
+
+/* Default styles for common addons */
+
 div.CodeMirror span.CodeMirror-matchingbracket {color: #0f0;}
 div.CodeMirror span.CodeMirror-nonmatchingbracket {color: #f22;}
+.CodeMirror-matchingtag { background: rgba(255, 150, 0, .3); }
 .CodeMirror-activeline-background {background: #e8f2ff;}
 
 /* STOP */
@@ -103,28 +150,28 @@
    the editor. You probably shouldn't touch them. */
 
 .CodeMirror {
-  line-height: 1;
   position: relative;
   overflow: hidden;
   background: white;
-  color: black;
 }
 
 .CodeMirror-scroll {
+  overflow: scroll !important; /* Things will break if this is overridden */
   /* 30px is the magic margin used to hide the element's real scrollbars */
   /* See overflow: hidden in .CodeMirror */
   margin-bottom: -30px; margin-right: -30px;
-  padding-bottom: 30px; padding-right: 30px;
+  padding-bottom: 30px;
   height: 100%;
   outline: none; /* Prevent dragging from highlighting the element */
   position: relative;
 }
 .CodeMirror-sizer {
   position: relative;
+  border-right: 30px solid transparent;
 }
 
 /* The fake, visible scrollbars. Used to force redraw during scrolling
-   before actuall scrolling happens, thus preventing shaking and
+   before actual scrolling happens, thus preventing shaking and
    flickering artifacts. */
 .CodeMirror-vscrollbar, .CodeMirror-hscrollbar, .CodeMirror-scrollbar-filler, .CodeMirror-gutter-filler {
   position: absolute;
@@ -150,27 +197,38 @@
 
 .CodeMirror-gutters {
   position: absolute; left: 0; top: 0;
-  padding-bottom: 30px;
+  min-height: 100%;
   z-index: 3;
 }
 .CodeMirror-gutter {
   white-space: normal;
   height: 100%;
-  padding-bottom: 30px;
-  margin-bottom: -32px;
   display: inline-block;
-  /* Hack to make IE7 behave */
-  *zoom:1;
-  *display:inline;
+  vertical-align: top;
+  margin-bottom: -30px;
+}
+.CodeMirror-gutter-wrapper {
+  position: absolute;
+  z-index: 4;
+  background: none !important;
+  border: none !important;
+}
+.CodeMirror-gutter-background {
+  position: absolute;
+  top: 0; bottom: 0;
+  z-index: 4;
 }
 .CodeMirror-gutter-elt {
   position: absolute;
   cursor: default;
   z-index: 4;
 }
+.CodeMirror-gutter-wrapper ::selection { background-color: transparent }
+.CodeMirror-gutter-wrapper ::-moz-selection { background-color: transparent }
 
 .CodeMirror-lines {
   cursor: text;
+  min-height: 1px; /* prevents collapsing before first draw */
 }
 .CodeMirror pre {
   /* Reset some styles that the rest of the page might have set */
@@ -187,22 +245,16 @@
   z-index: 2;
   position: relative;
   overflow: visible;
+  -webkit-tap-highlight-color: transparent;
+  -webkit-font-variant-ligatures: contextual;
+  font-variant-ligatures: contextual;
 }
 .CodeMirror-wrap pre {
   word-wrap: break-word;
   white-space: pre-wrap;
   word-break: normal;
 }
-.CodeMirror-code pre {
-  border-right: 30px solid transparent;
-  width: -webkit-fit-content;
-  width: -moz-fit-content;
-  width: fit-content;
-}
-.CodeMirror-wrap .CodeMirror-code pre {
-  border-right: none;
-  width: auto;
-}
+
 .CodeMirror-linebackground {
   position: absolute;
   left: 0; right: 0; top: 0; bottom: 0;
@@ -215,45 +267,74 @@
   overflow: auto;
 }
 
-.CodeMirror-widget {
+.CodeMirror-widget {}
+
+.CodeMirror-rtl pre { direction: rtl; }
+
+.CodeMirror-code {
+  outline: none;
 }
 
-.CodeMirror-wrap .CodeMirror-scroll {
-  overflow-x: hidden;
+/* Force content-box sizing for the elements where we expect it */
+.CodeMirror-scroll,
+.CodeMirror-sizer,
+.CodeMirror-gutter,
+.CodeMirror-gutters,
+.CodeMirror-linenumber {
+  -moz-box-sizing: content-box;
+  box-sizing: content-box;
 }
 
 .CodeMirror-measure {
   position: absolute;
-  width: 100%; height: 0px;
+  width: 100%;
+  height: 0;
   overflow: hidden;
   visibility: hidden;
 }
+
+.CodeMirror-cursor {
+  position: absolute;
+  pointer-events: none;
+}
 .CodeMirror-measure pre { position: static; }
 
-.CodeMirror div.CodeMirror-cursor {
-  position: absolute;
+div.CodeMirror-cursors {
   visibility: hidden;
-  border-right: none;
-  width: 0;
+  position: relative;
+  z-index: 3;
 }
-.CodeMirror-focused div.CodeMirror-cursor {
+div.CodeMirror-dragcursors {
+  visibility: visible;
+}
+
+.CodeMirror-focused div.CodeMirror-cursors {
   visibility: visible;
 }
 
 .CodeMirror-selected { background: #d9d9d9; }
 .CodeMirror-focused .CodeMirror-selected { background: #d7d4f0; }
+.CodeMirror-crosshair { cursor: crosshair; }
+.CodeMirror-line::selection, .CodeMirror-line > span::selection, .CodeMirror-line > span > span::selection { background: #d7d4f0; }
+.CodeMirror-line::-moz-selection, .CodeMirror-line > span::-moz-selection, .CodeMirror-line > span > span::-moz-selection { background: #d7d4f0; }
 
 .cm-searching {
   background: #ffa;
   background: rgba(255, 255, 0, .4);
 }
 
-/* IE7 hack to prevent it from returning funny offsetTops on the spans */
-.CodeMirror span { *vertical-align: text-bottom; }
+/* Used to force a border model for a node */
+.cm-force-border { padding-right: .1px; }
 
 @media print {
   /* Hide the cursor when printing */
-  .CodeMirror div.CodeMirror-cursor {
+  .CodeMirror div.CodeMirror-cursors {
     visibility: hidden;
   }
 }
+
+/* See issue #2901 */
+.cm-tab-wrap-hack:after { content: ''; }
+
+/* Help users use markselection to safely style text background */
+span.CodeMirror-selectedtext { background: none; }
diff --git a/static/lib/codemirror/lib/codemirror.js b/static/lib/codemirror/lib/codemirror.js
index 120e09b..8f2e33d 100644
--- a/static/lib/codemirror/lib/codemirror.js
+++ b/static/lib/codemirror/lib/codemirror.js
@@ -1,5829 +1,9331 @@
-// CodeMirror version 3.16
+// CodeMirror, copyright (c) by Marijn Haverbeke and others
+// Distributed under an MIT license: http://codemirror.net/LICENSE
+
+// This is CodeMirror (http://codemirror.net), a code editor
+// implemented in JavaScript on top of the browser's DOM.
 //
-// CodeMirror is the only global var we claim
-window.CodeMirror = (function() {
-  "use strict";
+// You can find some technical background for some of the code below
+// at http://marijnhaverbeke.nl/blog/#cm-internals .
 
-  // BROWSER SNIFFING
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
+  typeof define === 'function' && define.amd ? define(factory) :
+  (global.CodeMirror = factory());
+}(this, (function () { 'use strict';
 
-  // Crude, but necessary to handle a number of hard-to-feature-detect
-  // bugs and behavior differences.
-  var gecko = /gecko\/\d/i.test(navigator.userAgent);
-  var ie = /MSIE \d/.test(navigator.userAgent);
-  var ie_lt8 = ie && (document.documentMode == null || document.documentMode < 8);
-  var ie_lt9 = ie && (document.documentMode == null || document.documentMode < 9);
-  var webkit = /WebKit\//.test(navigator.userAgent);
-  var qtwebkit = webkit && /Qt\/\d+\.\d+/.test(navigator.userAgent);
-  var chrome = /Chrome\//.test(navigator.userAgent);
-  var opera = /Opera\//.test(navigator.userAgent);
-  var safari = /Apple Computer/.test(navigator.vendor);
-  var khtml = /KHTML\//.test(navigator.userAgent);
-  var mac_geLion = /Mac OS X 1\d\D([7-9]|\d\d)\D/.test(navigator.userAgent);
-  var mac_geMountainLion = /Mac OS X 1\d\D([8-9]|\d\d)\D/.test(navigator.userAgent);
-  var phantom = /PhantomJS/.test(navigator.userAgent);
+// Kludges for bugs and behavior differences that can't be feature
+// detected are enabled based on userAgent etc sniffing.
+var userAgent = navigator.userAgent
+var platform = navigator.platform
 
-  var ios = /AppleWebKit/.test(navigator.userAgent) && /Mobile\/\w+/.test(navigator.userAgent);
-  // This is woefully incomplete. Suggestions for alternative methods welcome.
-  var mobile = ios || /Android|webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(navigator.userAgent);
-  var mac = ios || /Mac/.test(navigator.platform);
-  var windows = /win/i.test(navigator.platform);
+var gecko = /gecko\/\d/i.test(userAgent)
+var ie_upto10 = /MSIE \d/.test(userAgent)
+var ie_11up = /Trident\/(?:[7-9]|\d{2,})\..*rv:(\d+)/.exec(userAgent)
+var edge = /Edge\/(\d+)/.exec(userAgent)
+var ie = ie_upto10 || ie_11up || edge
+var ie_version = ie && (ie_upto10 ? document.documentMode || 6 : +(edge || ie_11up)[1])
+var webkit = !edge && /WebKit\//.test(userAgent)
+var qtwebkit = webkit && /Qt\/\d+\.\d+/.test(userAgent)
+var chrome = !edge && /Chrome\//.test(userAgent)
+var presto = /Opera\//.test(userAgent)
+var safari = /Apple Computer/.test(navigator.vendor)
+var mac_geMountainLion = /Mac OS X 1\d\D([8-9]|\d\d)\D/.test(userAgent)
+var phantom = /PhantomJS/.test(userAgent)
 
-  var opera_version = opera && navigator.userAgent.match(/Version\/(\d*\.\d*)/);
-  if (opera_version) opera_version = Number(opera_version[1]);
-  if (opera_version && opera_version >= 15) { opera = false; webkit = true; }
-  // Some browsers use the wrong event properties to signal cmd/ctrl on OS X
-  var flipCtrlCmd = mac && (qtwebkit || opera && (opera_version == null || opera_version < 12.11));
-  var captureMiddleClick = gecko || (ie && !ie_lt9);
+var ios = !edge && /AppleWebKit/.test(userAgent) && /Mobile\/\w+/.test(userAgent)
+var android = /Android/.test(userAgent)
+// This is woefully incomplete. Suggestions for alternative methods welcome.
+var mobile = ios || android || /webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(userAgent)
+var mac = ios || /Mac/.test(platform)
+var chromeOS = /\bCrOS\b/.test(userAgent)
+var windows = /win/i.test(platform)
 
-  // Optimize some code when these features are not used
-  var sawReadOnlySpans = false, sawCollapsedSpans = false;
+var presto_version = presto && userAgent.match(/Version\/(\d*\.\d*)/)
+if (presto_version) { presto_version = Number(presto_version[1]) }
+if (presto_version && presto_version >= 15) { presto = false; webkit = true }
+// Some browsers use the wrong event properties to signal cmd/ctrl on OS X
+var flipCtrlCmd = mac && (qtwebkit || presto && (presto_version == null || presto_version < 12.11))
+var captureRightClick = gecko || (ie && ie_version >= 9)
 
-  // CONSTRUCTOR
+function classTest(cls) { return new RegExp("(^|\\s)" + cls + "(?:$|\\s)\\s*") }
 
-  function CodeMirror(place, options) {
-    if (!(this instanceof CodeMirror)) return new CodeMirror(place, options);
+var rmClass = function(node, cls) {
+  var current = node.className
+  var match = classTest(cls).exec(current)
+  if (match) {
+    var after = current.slice(match.index + match[0].length)
+    node.className = current.slice(0, match.index) + (after ? match[1] + after : "")
+  }
+}
 
-    this.options = options = options || {};
-    // Determine effective options based on given values and defaults.
-    for (var opt in defaults) if (!options.hasOwnProperty(opt) && defaults.hasOwnProperty(opt))
-      options[opt] = defaults[opt];
-    setGuttersForLineNumbers(options);
+function removeChildren(e) {
+  for (var count = e.childNodes.length; count > 0; --count)
+    { e.removeChild(e.firstChild) }
+  return e
+}
 
-    var docStart = typeof options.value == "string" ? 0 : options.value.first;
-    var display = this.display = makeDisplay(place, docStart);
-    display.wrapper.CodeMirror = this;
-    updateGutters(this);
-    if (options.autofocus && !mobile) focusInput(this);
+function removeChildrenAndAdd(parent, e) {
+  return removeChildren(parent).appendChild(e)
+}
 
-    this.state = {keyMaps: [],
-                  overlays: [],
-                  modeGen: 0,
-                  overwrite: false, focused: false,
-                  suppressEdits: false, pasteIncoming: false,
-                  draggingText: false,
-                  highlight: new Delayed()};
+function elt(tag, content, className, style) {
+  var e = document.createElement(tag)
+  if (className) { e.className = className }
+  if (style) { e.style.cssText = style }
+  if (typeof content == "string") { e.appendChild(document.createTextNode(content)) }
+  else if (content) { for (var i = 0; i < content.length; ++i) { e.appendChild(content[i]) } }
+  return e
+}
+// wrapper for elt, which removes the elt from the accessibility tree
+function eltP(tag, content, className, style) {
+  var e = elt(tag, content, className, style)
+  e.setAttribute("role", "presentation")
+  return e
+}
 
-    themeChanged(this);
-    if (options.lineWrapping)
-      this.display.wrapper.className += " CodeMirror-wrap";
+var range
+if (document.createRange) { range = function(node, start, end, endNode) {
+  var r = document.createRange()
+  r.setEnd(endNode || node, end)
+  r.setStart(node, start)
+  return r
+} }
+else { range = function(node, start, end) {
+  var r = document.body.createTextRange()
+  try { r.moveToElementText(node.parentNode) }
+  catch(e) { return r }
+  r.collapse(true)
+  r.moveEnd("character", end)
+  r.moveStart("character", start)
+  return r
+} }
 
-    var doc = options.value;
-    if (typeof doc == "string") doc = new Doc(options.value, options.mode);
-    operation(this, attachDoc)(this, doc);
+function contains(parent, child) {
+  if (child.nodeType == 3) // Android browser always returns false when child is a textnode
+    { child = child.parentNode }
+  if (parent.contains)
+    { return parent.contains(child) }
+  do {
+    if (child.nodeType == 11) { child = child.host }
+    if (child == parent) { return true }
+  } while (child = child.parentNode)
+}
 
-    // Override magic textarea content restore that IE sometimes does
-    // on our hidden textarea on reload
-    if (ie) setTimeout(bind(resetInput, this, true), 20);
+function activeElt() {
+  // IE and Edge may throw an "Unspecified Error" when accessing document.activeElement.
+  // IE < 10 will throw when accessed while the page is loading or in an iframe.
+  // IE > 9 and Edge will throw when accessed in an iframe if document.body is unavailable.
+  var activeElement
+  try {
+    activeElement = document.activeElement
+  } catch(e) {
+    activeElement = document.body || null
+  }
+  while (activeElement && activeElement.shadowRoot && activeElement.shadowRoot.activeElement)
+    { activeElement = activeElement.shadowRoot.activeElement }
+  return activeElement
+}
 
-    registerEventHandlers(this);
-    // IE throws unspecified error in certain cases, when
-    // trying to access activeElement before onload
-    var hasFocus; try { hasFocus = (document.activeElement == display.input); } catch(e) { }
-    if (hasFocus || (options.autofocus && !mobile)) setTimeout(bind(onFocus, this), 20);
-    else onBlur(this);
+function addClass(node, cls) {
+  var current = node.className
+  if (!classTest(cls).test(current)) { node.className += (current ? " " : "") + cls }
+}
+function joinClasses(a, b) {
+  var as = a.split(" ")
+  for (var i = 0; i < as.length; i++)
+    { if (as[i] && !classTest(as[i]).test(b)) { b += " " + as[i] } }
+  return b
+}
 
-    operation(this, function() {
-      for (var opt in optionHandlers)
-        if (optionHandlers.propertyIsEnumerable(opt))
-          optionHandlers[opt](this, options[opt], Init);
-      for (var i = 0; i < initHooks.length; ++i) initHooks[i](this);
-    })();
+var selectInput = function(node) { node.select() }
+if (ios) // Mobile Safari apparently has a bug where select() is broken.
+  { selectInput = function(node) { node.selectionStart = 0; node.selectionEnd = node.value.length } }
+else if (ie) // Suppress mysterious IE10 errors
+  { selectInput = function(node) { try { node.select() } catch(_e) {} } }
+
+function bind(f) {
+  var args = Array.prototype.slice.call(arguments, 1)
+  return function(){return f.apply(null, args)}
+}
+
+function copyObj(obj, target, overwrite) {
+  if (!target) { target = {} }
+  for (var prop in obj)
+    { if (obj.hasOwnProperty(prop) && (overwrite !== false || !target.hasOwnProperty(prop)))
+      { target[prop] = obj[prop] } }
+  return target
+}
+
+// Counts the column offset in a string, taking tabs into account.
+// Used mostly to find indentation.
+function countColumn(string, end, tabSize, startIndex, startValue) {
+  if (end == null) {
+    end = string.search(/[^\s\u00a0]/)
+    if (end == -1) { end = string.length }
+  }
+  for (var i = startIndex || 0, n = startValue || 0;;) {
+    var nextTab = string.indexOf("\t", i)
+    if (nextTab < 0 || nextTab >= end)
+      { return n + (end - i) }
+    n += nextTab - i
+    n += tabSize - (n % tabSize)
+    i = nextTab + 1
+  }
+}
+
+var Delayed = function() {this.id = null};
+Delayed.prototype.set = function (ms, f) {
+  clearTimeout(this.id)
+  this.id = setTimeout(f, ms)
+};
+
+function indexOf(array, elt) {
+  for (var i = 0; i < array.length; ++i)
+    { if (array[i] == elt) { return i } }
+  return -1
+}
+
+// Number of pixels added to scroller and sizer to hide scrollbar
+var scrollerGap = 30
+
+// Returned or thrown by various protocols to signal 'I'm not
+// handling this'.
+var Pass = {toString: function(){return "CodeMirror.Pass"}}
+
+// Reused option objects for setSelection & friends
+var sel_dontScroll = {scroll: false};
+var sel_mouse = {origin: "*mouse"};
+var sel_move = {origin: "+move"};
+// The inverse of countColumn -- find the offset that corresponds to
+// a particular column.
+function findColumn(string, goal, tabSize) {
+  for (var pos = 0, col = 0;;) {
+    var nextTab = string.indexOf("\t", pos)
+    if (nextTab == -1) { nextTab = string.length }
+    var skipped = nextTab - pos
+    if (nextTab == string.length || col + skipped >= goal)
+      { return pos + Math.min(skipped, goal - col) }
+    col += nextTab - pos
+    col += tabSize - (col % tabSize)
+    pos = nextTab + 1
+    if (col >= goal) { return pos }
+  }
+}
+
+var spaceStrs = [""]
+function spaceStr(n) {
+  while (spaceStrs.length <= n)
+    { spaceStrs.push(lst(spaceStrs) + " ") }
+  return spaceStrs[n]
+}
+
+function lst(arr) { return arr[arr.length-1] }
+
+function map(array, f) {
+  var out = []
+  for (var i = 0; i < array.length; i++) { out[i] = f(array[i], i) }
+  return out
+}
+
+function insertSorted(array, value, score) {
+  var pos = 0, priority = score(value)
+  while (pos < array.length && score(array[pos]) <= priority) { pos++ }
+  array.splice(pos, 0, value)
+}
+
+function nothing() {}
+
+function createObj(base, props) {
+  var inst
+  if (Object.create) {
+    inst = Object.create(base)
+  } else {
+    nothing.prototype = base
+    inst = new nothing()
+  }
+  if (props) { copyObj(props, inst) }
+  return inst
+}
+
+var nonASCIISingleCaseWordChar = /[\u00df\u0587\u0590-\u05f4\u0600-\u06ff\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc\uac00-\ud7af]/
+function isWordCharBasic(ch) {
+  return /\w/.test(ch) || ch > "\x80" &&
+    (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch))
+}
+function isWordChar(ch, helper) {
+  if (!helper) { return isWordCharBasic(ch) }
+  if (helper.source.indexOf("\\w") > -1 && isWordCharBasic(ch)) { return true }
+  return helper.test(ch)
+}
+
+function isEmpty(obj) {
+  for (var n in obj) { if (obj.hasOwnProperty(n) && obj[n]) { return false } }
+  return true
+}
+
+// Extending unicode characters. A series of a non-extending char +
+// any number of extending chars is treated as a single unit as far
+// as editing and measuring is concerned. This is not fully correct,
+// since some scripts/fonts/browsers also treat other configurations
+// of code points as a group.
+var extendingChars = /[\u0300-\u036f\u0483-\u0489\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610-\u061a\u064b-\u065e\u0670\u06d6-\u06dc\u06de-\u06e4\u06e7\u06e8\u06ea-\u06ed\u0711\u0730-\u074a\u07a6-\u07b0\u07eb-\u07f3\u0816-\u0819\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0900-\u0902\u093c\u0941-\u0948\u094d\u0951-\u0955\u0962\u0963\u0981\u09bc\u09be\u09c1-\u09c4\u09cd\u09d7\u09e2\u09e3\u0a01\u0a02\u0a3c\u0a41\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a70\u0a71\u0a75\u0a81\u0a82\u0abc\u0ac1-\u0ac5\u0ac7\u0ac8\u0acd\u0ae2\u0ae3\u0b01\u0b3c\u0b3e\u0b3f\u0b41-\u0b44\u0b4d\u0b56\u0b57\u0b62\u0b63\u0b82\u0bbe\u0bc0\u0bcd\u0bd7\u0c3e-\u0c40\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c62\u0c63\u0cbc\u0cbf\u0cc2\u0cc6\u0ccc\u0ccd\u0cd5\u0cd6\u0ce2\u0ce3\u0d3e\u0d41-\u0d44\u0d4d\u0d57\u0d62\u0d63\u0dca\u0dcf\u0dd2-\u0dd4\u0dd6\u0ddf\u0e31\u0e34-\u0e3a\u0e47-\u0e4e\u0eb1\u0eb4-\u0eb9\u0ebb\u0ebc\u0ec8-\u0ecd\u0f18\u0f19\u0f35\u0f37\u0f39\u0f71-\u0f7e\u0f80-\u0f84\u0f86\u0f87\u0f90-\u0f97\u0f99-\u0fbc\u0fc6\u102d-\u1030\u1032-\u1037\u1039\u103a\u103d\u103e\u1058\u1059\u105e-\u1060\u1071-\u1074\u1082\u1085\u1086\u108d\u109d\u135f\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17b7-\u17bd\u17c6\u17c9-\u17d3\u17dd\u180b-\u180d\u18a9\u1920-\u1922\u1927\u1928\u1932\u1939-\u193b\u1a17\u1a18\u1a56\u1a58-\u1a5e\u1a60\u1a62\u1a65-\u1a6c\u1a73-\u1a7c\u1a7f\u1b00-\u1b03\u1b34\u1b36-\u1b3a\u1b3c\u1b42\u1b6b-\u1b73\u1b80\u1b81\u1ba2-\u1ba5\u1ba8\u1ba9\u1c2c-\u1c33\u1c36\u1c37\u1cd0-\u1cd2\u1cd4-\u1ce0\u1ce2-\u1ce8\u1ced\u1dc0-\u1de6\u1dfd-\u1dff\u200c\u200d\u20d0-\u20f0\u2cef-\u2cf1\u2de0-\u2dff\u302a-\u302f\u3099\u309a\ua66f-\ua672\ua67c\ua67d\ua6f0\ua6f1\ua802\ua806\ua80b\ua825\ua826\ua8c4\ua8e0-\ua8f1\ua926-\ua92d\ua947-\ua951\ua980-\ua982\ua9b3\ua9b6-\ua9b9\ua9bc\uaa29-\uaa2e\uaa31\uaa32\uaa35\uaa36\uaa43\uaa4c\uaab0\uaab2-\uaab4\uaab7\uaab8\uaabe\uaabf\uaac1\uabe5\uabe8\uabed\udc00-\udfff\ufb1e\ufe00-\ufe0f\ufe20-\ufe26\uff9e\uff9f]/
+function isExtendingChar(ch) { return ch.charCodeAt(0) >= 768 && extendingChars.test(ch) }
+
+// Returns a number from the range [`0`; `str.length`] unless `pos` is outside that range.
+function skipExtendingChars(str, pos, dir) {
+  while ((dir < 0 ? pos > 0 : pos < str.length) && isExtendingChar(str.charAt(pos))) { pos += dir }
+  return pos
+}
+
+// Returns the value from the range [`from`; `to`] that satisfies
+// `pred` and is closest to `from`. Assumes that at least `to` satisfies `pred`.
+function findFirst(pred, from, to) {
+  for (;;) {
+    if (Math.abs(from - to) <= 1) { return pred(from) ? from : to }
+    var mid = Math.floor((from + to) / 2)
+    if (pred(mid)) { to = mid }
+    else { from = mid }
+  }
+}
+
+// The display handles the DOM integration, both for input reading
+// and content drawing. It holds references to DOM nodes and
+// display-related state.
+
+function Display(place, doc, input) {
+  var d = this
+  this.input = input
+
+  // Covers bottom-right square when both scrollbars are present.
+  d.scrollbarFiller = elt("div", null, "CodeMirror-scrollbar-filler")
+  d.scrollbarFiller.setAttribute("cm-not-content", "true")
+  // Covers bottom of gutter when coverGutterNextToScrollbar is on
+  // and h scrollbar is present.
+  d.gutterFiller = elt("div", null, "CodeMirror-gutter-filler")
+  d.gutterFiller.setAttribute("cm-not-content", "true")
+  // Will contain the actual code, positioned to cover the viewport.
+  d.lineDiv = eltP("div", null, "CodeMirror-code")
+  // Elements are added to these to represent selection and cursors.
+  d.selectionDiv = elt("div", null, null, "position: relative; z-index: 1")
+  d.cursorDiv = elt("div", null, "CodeMirror-cursors")
+  // A visibility: hidden element used to find the size of things.
+  d.measure = elt("div", null, "CodeMirror-measure")
+  // When lines outside of the viewport are measured, they are drawn in this.
+  d.lineMeasure = elt("div", null, "CodeMirror-measure")
+  // Wraps everything that needs to exist inside the vertically-padded coordinate system
+  d.lineSpace = eltP("div", [d.measure, d.lineMeasure, d.selectionDiv, d.cursorDiv, d.lineDiv],
+                    null, "position: relative; outline: none")
+  var lines = eltP("div", [d.lineSpace], "CodeMirror-lines")
+  // Moved around its parent to cover visible view.
+  d.mover = elt("div", [lines], null, "position: relative")
+  // Set to the height of the document, allowing scrolling.
+  d.sizer = elt("div", [d.mover], "CodeMirror-sizer")
+  d.sizerWidth = null
+  // Behavior of elts with overflow: auto and padding is
+  // inconsistent across browsers. This is used to ensure the
+  // scrollable area is big enough.
+  d.heightForcer = elt("div", null, null, "position: absolute; height: " + scrollerGap + "px; width: 1px;")
+  // Will contain the gutters, if any.
+  d.gutters = elt("div", null, "CodeMirror-gutters")
+  d.lineGutter = null
+  // Actual scrollable element.
+  d.scroller = elt("div", [d.sizer, d.heightForcer, d.gutters], "CodeMirror-scroll")
+  d.scroller.setAttribute("tabIndex", "-1")
+  // The element in which the editor lives.
+  d.wrapper = elt("div", [d.scrollbarFiller, d.gutterFiller, d.scroller], "CodeMirror")
+
+  // Work around IE7 z-index bug (not perfect, hence IE7 not really being supported)
+  if (ie && ie_version < 8) { d.gutters.style.zIndex = -1; d.scroller.style.paddingRight = 0 }
+  if (!webkit && !(gecko && mobile)) { d.scroller.draggable = true }
+
+  if (place) {
+    if (place.appendChild) { place.appendChild(d.wrapper) }
+    else { place(d.wrapper) }
   }
 
-  // DISPLAY CONSTRUCTOR
+  // Current rendered range (may be bigger than the view window).
+  d.viewFrom = d.viewTo = doc.first
+  d.reportedViewFrom = d.reportedViewTo = doc.first
+  // Information about the rendered lines.
+  d.view = []
+  d.renderedView = null
+  // Holds info about a single rendered line when it was rendered
+  // for measurement, while not in view.
+  d.externalMeasured = null
+  // Empty space (in pixels) above the view
+  d.viewOffset = 0
+  d.lastWrapHeight = d.lastWrapWidth = 0
+  d.updateLineNumbers = null
 
-  function makeDisplay(place, docStart) {
-    var d = {};
+  d.nativeBarWidth = d.barHeight = d.barWidth = 0
+  d.scrollbarsClipped = false
 
-    var input = d.input = elt("textarea", null, null, "position: absolute; padding: 0; width: 1px; height: 1em; outline: none; font-size: 4px;");
-    if (webkit) input.style.width = "1000px";
-    else input.setAttribute("wrap", "off");
-    // if border: 0; -- iOS fails to open keyboard (issue #1287)
-    if (ios) input.style.border = "1px solid black";
-    input.setAttribute("autocorrect", "off"); input.setAttribute("autocapitalize", "off"); input.setAttribute("spellcheck", "false");
+  // Used to only resize the line number gutter when necessary (when
+  // the amount of lines crosses a boundary that makes its width change)
+  d.lineNumWidth = d.lineNumInnerWidth = d.lineNumChars = null
+  // Set to true when a non-horizontal-scrolling line widget is
+  // added. As an optimization, line widget aligning is skipped when
+  // this is false.
+  d.alignWidgets = false
 
-    // Wraps and hides input textarea
-    d.inputDiv = elt("div", [input], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");
-    // The actual fake scrollbars.
-    d.scrollbarH = elt("div", [elt("div", null, null, "height: 1px")], "CodeMirror-hscrollbar");
-    d.scrollbarV = elt("div", [elt("div", null, null, "width: 1px")], "CodeMirror-vscrollbar");
-    d.scrollbarFiller = elt("div", null, "CodeMirror-scrollbar-filler");
-    d.gutterFiller = elt("div", null, "CodeMirror-gutter-filler");
-    // DIVs containing the selection and the actual code
-    d.lineDiv = elt("div", null, "CodeMirror-code");
-    d.selectionDiv = elt("div", null, null, "position: relative; z-index: 1");
-    // Blinky cursor, and element used to ensure cursor fits at the end of a line
-    d.cursor = elt("div", "\u00a0", "CodeMirror-cursor");
-    // Secondary cursor, shown when on a 'jump' in bi-directional text
-    d.otherCursor = elt("div", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor");
-    // Used to measure text size
-    d.measure = elt("div", null, "CodeMirror-measure");
-    // Wraps everything that needs to exist inside the vertically-padded coordinate system
-    d.lineSpace = elt("div", [d.measure, d.selectionDiv, d.lineDiv, d.cursor, d.otherCursor],
-                         null, "position: relative; outline: none");
-    // Moved around its parent to cover visible view
-    d.mover = elt("div", [elt("div", [d.lineSpace], "CodeMirror-lines")], null, "position: relative");
-    // Set to the height of the text, causes scrolling
-    d.sizer = elt("div", [d.mover], "CodeMirror-sizer");
-    // D is needed because behavior of elts with overflow: auto and padding is inconsistent across browsers
-    d.heightForcer = elt("div", null, null, "position: absolute; height: " + scrollerCutOff + "px; width: 1px;");
-    // Will contain the gutters, if any
-    d.gutters = elt("div", null, "CodeMirror-gutters");
-    d.lineGutter = null;
-    // Provides scrolling
-    d.scroller = elt("div", [d.sizer, d.heightForcer, d.gutters], "CodeMirror-scroll");
-    d.scroller.setAttribute("tabIndex", "-1");
-    // The element in which the editor lives.
-    d.wrapper = elt("div", [d.inputDiv, d.scrollbarH, d.scrollbarV,
-                            d.scrollbarFiller, d.gutterFiller, d.scroller], "CodeMirror");
-    // Work around IE7 z-index bug
-    if (ie_lt8) { d.gutters.style.zIndex = -1; d.scroller.style.paddingRight = 0; }
-    if (place.appendChild) place.appendChild(d.wrapper); else place(d.wrapper);
+  d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null
 
-    // Needed to hide big blue blinking cursor on Mobile Safari
-    if (ios) input.style.width = "0px";
-    if (!webkit) d.scroller.draggable = true;
-    // Needed to handle Tab key in KHTML
-    if (khtml) { d.inputDiv.style.height = "1px"; d.inputDiv.style.position = "absolute"; }
-    // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
-    else if (ie_lt8) d.scrollbarH.style.minWidth = d.scrollbarV.style.minWidth = "18px";
+  // Tracks the maximum line length so that the horizontal scrollbar
+  // can be kept static when scrolling.
+  d.maxLine = null
+  d.maxLineLength = 0
+  d.maxLineChanged = false
 
-    // Current visible range (may be bigger than the view window).
-    d.viewOffset = d.lastSizeC = 0;
-    d.showingFrom = d.showingTo = docStart;
+  // Used for measuring wheel scrolling granularity
+  d.wheelDX = d.wheelDY = d.wheelStartX = d.wheelStartY = null
 
-    // Used to only resize the line number gutter when necessary (when
-    // the amount of lines crosses a boundary that makes its width change)
-    d.lineNumWidth = d.lineNumInnerWidth = d.lineNumChars = null;
-    // See readInput and resetInput
-    d.prevInput = "";
-    // Set to true when a non-horizontal-scrolling widget is added. As
-    // an optimization, widget aligning is skipped when d is false.
-    d.alignWidgets = false;
-    // Flag that indicates whether we currently expect input to appear
-    // (after some event like 'keypress' or 'input') and are polling
-    // intensively.
-    d.pollingFast = false;
-    // Self-resetting timeout for the poller
-    d.poll = new Delayed();
+  // True when shift is held down.
+  d.shift = false
 
-    d.cachedCharWidth = d.cachedTextHeight = null;
-    d.measureLineCache = [];
-    d.measureLineCachePos = 0;
+  // Used to track whether anything happened since the context menu
+  // was opened.
+  d.selForContextMenu = null
 
-    // Tracks when resetInput has punted to just putting a short
-    // string instead of the (large) selection.
-    d.inaccurateSelection = false;
+  d.activeTouch = null
 
-    // Tracks the maximum line length so that the horizontal scrollbar
-    // can be kept static when scrolling.
-    d.maxLine = null;
-    d.maxLineLength = 0;
-    d.maxLineChanged = false;
+  input.init(d)
+}
 
-    // Used for measuring wheel scrolling granularity
-    d.wheelDX = d.wheelDY = d.wheelStartX = d.wheelStartY = null;
-
-    return d;
-  }
-
-  // STATE UPDATES
-
-  // Used to get the editor into a consistent state again when options change.
-
-  function loadMode(cm) {
-    cm.doc.mode = CodeMirror.getMode(cm.options, cm.doc.modeOption);
-    cm.doc.iter(function(line) {
-      if (line.stateAfter) line.stateAfter = null;
-      if (line.styles) line.styles = null;
-    });
-    cm.doc.frontier = cm.doc.first;
-    startWorker(cm, 100);
-    cm.state.modeGen++;
-    if (cm.curOp) regChange(cm);
-  }
-
-  function wrappingChanged(cm) {
-    if (cm.options.lineWrapping) {
-      cm.display.wrapper.className += " CodeMirror-wrap";
-      cm.display.sizer.style.minWidth = "";
-    } else {
-      cm.display.wrapper.className = cm.display.wrapper.className.replace(" CodeMirror-wrap", "");
-      computeMaxLength(cm);
+// Find the line object corresponding to the given line number.
+function getLine(doc, n) {
+  n -= doc.first
+  if (n < 0 || n >= doc.size) { throw new Error("There is no line " + (n + doc.first) + " in the document.") }
+  var chunk = doc
+  while (!chunk.lines) {
+    for (var i = 0;; ++i) {
+      var child = chunk.children[i], sz = child.chunkSize()
+      if (n < sz) { chunk = child; break }
+      n -= sz
     }
-    estimateLineHeights(cm);
-    regChange(cm);
-    clearCaches(cm);
-    setTimeout(function(){updateScrollbars(cm);}, 100);
   }
+  return chunk.lines[n]
+}
 
-  function estimateHeight(cm) {
-    var th = textHeight(cm.display), wrapping = cm.options.lineWrapping;
-    var perLine = wrapping && Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3);
-    return function(line) {
-      if (lineIsHidden(cm.doc, line))
-        return 0;
-      else if (wrapping)
-        return (Math.ceil(line.text.length / perLine) || 1) * th;
-      else
-        return th;
-    };
+// Get the part of a document between two positions, as an array of
+// strings.
+function getBetween(doc, start, end) {
+  var out = [], n = start.line
+  doc.iter(start.line, end.line + 1, function (line) {
+    var text = line.text
+    if (n == end.line) { text = text.slice(0, end.ch) }
+    if (n == start.line) { text = text.slice(start.ch) }
+    out.push(text)
+    ++n
+  })
+  return out
+}
+// Get the lines between from and to, as array of strings.
+function getLines(doc, from, to) {
+  var out = []
+  doc.iter(from, to, function (line) { out.push(line.text) }) // iter aborts when callback returns truthy value
+  return out
+}
+
+// Update the height of a line, propagating the height change
+// upwards to parent nodes.
+function updateLineHeight(line, height) {
+  var diff = height - line.height
+  if (diff) { for (var n = line; n; n = n.parent) { n.height += diff } }
+}
+
+// Given a line object, find its line number by walking up through
+// its parent links.
+function lineNo(line) {
+  if (line.parent == null) { return null }
+  var cur = line.parent, no = indexOf(cur.lines, line)
+  for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
+    for (var i = 0;; ++i) {
+      if (chunk.children[i] == cur) { break }
+      no += chunk.children[i].chunkSize()
+    }
   }
+  return no + cur.first
+}
 
-  function estimateLineHeights(cm) {
-    var doc = cm.doc, est = estimateHeight(cm);
-    doc.iter(function(line) {
-      var estHeight = est(line);
-      if (estHeight != line.height) updateLineHeight(line, estHeight);
-    });
+// Find the line at the given vertical position, using the height
+// information in the document tree.
+function lineAtHeight(chunk, h) {
+  var n = chunk.first
+  outer: do {
+    for (var i$1 = 0; i$1 < chunk.children.length; ++i$1) {
+      var child = chunk.children[i$1], ch = child.height
+      if (h < ch) { chunk = child; continue outer }
+      h -= ch
+      n += child.chunkSize()
+    }
+    return n
+  } while (!chunk.lines)
+  var i = 0
+  for (; i < chunk.lines.length; ++i) {
+    var line = chunk.lines[i], lh = line.height
+    if (h < lh) { break }
+    h -= lh
   }
+  return n + i
+}
 
-  function keyMapChanged(cm) {
-    var map = keyMap[cm.options.keyMap], style = map.style;
-    cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-keymap-\S+/g, "") +
-      (style ? " cm-keymap-" + style : "");
-    cm.state.disableInput = map.disableInput;
-  }
+function isLine(doc, l) {return l >= doc.first && l < doc.first + doc.size}
 
-  function themeChanged(cm) {
-    cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-s-\S+/g, "") +
-      cm.options.theme.replace(/(^|\s)\s*/g, " cm-s-");
-    clearCaches(cm);
-  }
+function lineNumberFor(options, i) {
+  return String(options.lineNumberFormatter(i + options.firstLineNumber))
+}
 
-  function guttersChanged(cm) {
-    updateGutters(cm);
-    regChange(cm);
-    setTimeout(function(){alignHorizontally(cm);}, 20);
-  }
+// A Pos instance represents a position within the text.
+function Pos(line, ch, sticky) {
+  if ( sticky === void 0 ) sticky = null;
 
-  function updateGutters(cm) {
-    var gutters = cm.display.gutters, specs = cm.options.gutters;
-    removeChildren(gutters);
-    for (var i = 0; i < specs.length; ++i) {
-      var gutterClass = specs[i];
-      var gElt = gutters.appendChild(elt("div", null, "CodeMirror-gutter " + gutterClass));
-      if (gutterClass == "CodeMirror-linenumbers") {
-        cm.display.lineGutter = gElt;
-        gElt.style.width = (cm.display.lineNumWidth || 1) + "px";
+  if (!(this instanceof Pos)) { return new Pos(line, ch, sticky) }
+  this.line = line
+  this.ch = ch
+  this.sticky = sticky
+}
+
+// Compare two positions, return 0 if they are the same, a negative
+// number when a is less, and a positive number otherwise.
+function cmp(a, b) { return a.line - b.line || a.ch - b.ch }
+
+function equalCursorPos(a, b) { return a.sticky == b.sticky && cmp(a, b) == 0 }
+
+function copyPos(x) {return Pos(x.line, x.ch)}
+function maxPos(a, b) { return cmp(a, b) < 0 ? b : a }
+function minPos(a, b) { return cmp(a, b) < 0 ? a : b }
+
+// Most of the external API clips given positions to make sure they
+// actually exist within the document.
+function clipLine(doc, n) {return Math.max(doc.first, Math.min(n, doc.first + doc.size - 1))}
+function clipPos(doc, pos) {
+  if (pos.line < doc.first) { return Pos(doc.first, 0) }
+  var last = doc.first + doc.size - 1
+  if (pos.line > last) { return Pos(last, getLine(doc, last).text.length) }
+  return clipToLen(pos, getLine(doc, pos.line).text.length)
+}
+function clipToLen(pos, linelen) {
+  var ch = pos.ch
+  if (ch == null || ch > linelen) { return Pos(pos.line, linelen) }
+  else if (ch < 0) { return Pos(pos.line, 0) }
+  else { return pos }
+}
+function clipPosArray(doc, array) {
+  var out = []
+  for (var i = 0; i < array.length; i++) { out[i] = clipPos(doc, array[i]) }
+  return out
+}
+
+// Optimize some code when these features are not used.
+var sawReadOnlySpans = false;
+var sawCollapsedSpans = false;
+function seeReadOnlySpans() {
+  sawReadOnlySpans = true
+}
+
+function seeCollapsedSpans() {
+  sawCollapsedSpans = true
+}
+
+// TEXTMARKER SPANS
+
+function MarkedSpan(marker, from, to) {
+  this.marker = marker
+  this.from = from; this.to = to
+}
+
+// Search an array of spans for a span matching the given marker.
+function getMarkedSpanFor(spans, marker) {
+  if (spans) { for (var i = 0; i < spans.length; ++i) {
+    var span = spans[i]
+    if (span.marker == marker) { return span }
+  } }
+}
+// Remove a span from an array, returning undefined if no spans are
+// left (we don't store arrays for lines without spans).
+function removeMarkedSpan(spans, span) {
+  var r
+  for (var i = 0; i < spans.length; ++i)
+    { if (spans[i] != span) { (r || (r = [])).push(spans[i]) } }
+  return r
+}
+// Add a span to a line.
+function addMarkedSpan(line, span) {
+  line.markedSpans = line.markedSpans ? line.markedSpans.concat([span]) : [span]
+  span.marker.attachLine(line)
+}
+
+// Used for the algorithm that adjusts markers for a change in the
+// document. These functions cut an array of spans at a given
+// character position, returning an array of remaining chunks (or
+// undefined if nothing remains).
+function markedSpansBefore(old, startCh, isInsert) {
+  var nw
+  if (old) { for (var i = 0; i < old.length; ++i) {
+    var span = old[i], marker = span.marker
+    var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= startCh : span.from < startCh)
+    if (startsBefore || span.from == startCh && marker.type == "bookmark" && (!isInsert || !span.marker.insertLeft)) {
+      var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= startCh : span.to > startCh)
+      ;(nw || (nw = [])).push(new MarkedSpan(marker, span.from, endsAfter ? null : span.to))
+    }
+  } }
+  return nw
+}
+function markedSpansAfter(old, endCh, isInsert) {
+  var nw
+  if (old) { for (var i = 0; i < old.length; ++i) {
+    var span = old[i], marker = span.marker
+    var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= endCh : span.to > endCh)
+    if (endsAfter || span.from == endCh && marker.type == "bookmark" && (!isInsert || span.marker.insertLeft)) {
+      var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh)
+      ;(nw || (nw = [])).push(new MarkedSpan(marker, startsBefore ? null : span.from - endCh,
+                                            span.to == null ? null : span.to - endCh))
+    }
+  } }
+  return nw
+}
+
+// Given a change object, compute the new set of marker spans that
+// cover the line in which the change took place. Removes spans
+// entirely within the change, reconnects spans belonging to the
+// same marker that appear on both sides of the change, and cuts off
+// spans partially within the change. Returns an array of span
+// arrays with one element for each line in (after) the change.
+function stretchSpansOverChange(doc, change) {
+  if (change.full) { return null }
+  var oldFirst = isLine(doc, change.from.line) && getLine(doc, change.from.line).markedSpans
+  var oldLast = isLine(doc, change.to.line) && getLine(doc, change.to.line).markedSpans
+  if (!oldFirst && !oldLast) { return null }
+
+  var startCh = change.from.ch, endCh = change.to.ch, isInsert = cmp(change.from, change.to) == 0
+  // Get the spans that 'stick out' on both sides
+  var first = markedSpansBefore(oldFirst, startCh, isInsert)
+  var last = markedSpansAfter(oldLast, endCh, isInsert)
+
+  // Next, merge those two ends
+  var sameLine = change.text.length == 1, offset = lst(change.text).length + (sameLine ? startCh : 0)
+  if (first) {
+    // Fix up .to properties of first
+    for (var i = 0; i < first.length; ++i) {
+      var span = first[i]
+      if (span.to == null) {
+        var found = getMarkedSpanFor(last, span.marker)
+        if (!found) { span.to = startCh }
+        else if (sameLine) { span.to = found.to == null ? null : found.to + offset }
       }
     }
-    gutters.style.display = i ? "" : "none";
   }
-
-  function lineLength(doc, line) {
-    if (line.height == 0) return 0;
-    var len = line.text.length, merged, cur = line;
-    while (merged = collapsedSpanAtStart(cur)) {
-      var found = merged.find();
-      cur = getLine(doc, found.from.line);
-      len += found.from.ch - found.to.ch;
-    }
-    cur = line;
-    while (merged = collapsedSpanAtEnd(cur)) {
-      var found = merged.find();
-      len -= cur.text.length - found.from.ch;
-      cur = getLine(doc, found.to.line);
-      len += cur.text.length - found.to.ch;
-    }
-    return len;
-  }
-
-  function computeMaxLength(cm) {
-    var d = cm.display, doc = cm.doc;
-    d.maxLine = getLine(doc, doc.first);
-    d.maxLineLength = lineLength(doc, d.maxLine);
-    d.maxLineChanged = true;
-    doc.iter(function(line) {
-      var len = lineLength(doc, line);
-      if (len > d.maxLineLength) {
-        d.maxLineLength = len;
-        d.maxLine = line;
-      }
-    });
-  }
-
-  // Make sure the gutters options contains the element
-  // "CodeMirror-linenumbers" when the lineNumbers option is true.
-  function setGuttersForLineNumbers(options) {
-    var found = false;
-    for (var i = 0; i < options.gutters.length; ++i) {
-      if (options.gutters[i] == "CodeMirror-linenumbers") {
-        if (options.lineNumbers) found = true;
-        else options.gutters.splice(i--, 1);
-      }
-    }
-    if (!found && options.lineNumbers)
-      options.gutters.push("CodeMirror-linenumbers");
-  }
-
-  // SCROLLBARS
-
-  // Re-synchronize the fake scrollbars with the actual size of the
-  // content. Optionally force a scrollTop.
-  function updateScrollbars(cm) {
-    var d = cm.display, docHeight = cm.doc.height;
-    var totalHeight = docHeight + paddingVert(d);
-    d.sizer.style.minHeight = d.heightForcer.style.top = totalHeight + "px";
-    d.gutters.style.height = Math.max(totalHeight, d.scroller.clientHeight - scrollerCutOff) + "px";
-    var scrollHeight = Math.max(totalHeight, d.scroller.scrollHeight);
-    var needsH = d.scroller.scrollWidth > (d.scroller.clientWidth + 1);
-    var needsV = scrollHeight > (d.scroller.clientHeight + 1);
-    if (needsV) {
-      d.scrollbarV.style.display = "block";
-      d.scrollbarV.style.bottom = needsH ? scrollbarWidth(d.measure) + "px" : "0";
-      d.scrollbarV.firstChild.style.height =
-        (scrollHeight - d.scroller.clientHeight + d.scrollbarV.clientHeight) + "px";
-    } else {
-      d.scrollbarV.style.display = "";
-      d.scrollbarV.firstChild.style.height = "0";
-    }
-    if (needsH) {
-      d.scrollbarH.style.display = "block";
-      d.scrollbarH.style.right = needsV ? scrollbarWidth(d.measure) + "px" : "0";
-      d.scrollbarH.firstChild.style.width =
-        (d.scroller.scrollWidth - d.scroller.clientWidth + d.scrollbarH.clientWidth) + "px";
-    } else {
-      d.scrollbarH.style.display = "";
-      d.scrollbarH.firstChild.style.width = "0";
-    }
-    if (needsH && needsV) {
-      d.scrollbarFiller.style.display = "block";
-      d.scrollbarFiller.style.height = d.scrollbarFiller.style.width = scrollbarWidth(d.measure) + "px";
-    } else d.scrollbarFiller.style.display = "";
-    if (needsH && cm.options.coverGutterNextToScrollbar && cm.options.fixedGutter) {
-      d.gutterFiller.style.display = "block";
-      d.gutterFiller.style.height = scrollbarWidth(d.measure) + "px";
-      d.gutterFiller.style.width = d.gutters.offsetWidth + "px";
-    } else d.gutterFiller.style.display = "";
-
-    if (mac_geLion && scrollbarWidth(d.measure) === 0)
-      d.scrollbarV.style.minWidth = d.scrollbarH.style.minHeight = mac_geMountainLion ? "18px" : "12px";
-  }
-
-  function visibleLines(display, doc, viewPort) {
-    var top = display.scroller.scrollTop, height = display.wrapper.clientHeight;
-    if (typeof viewPort == "number") top = viewPort;
-    else if (viewPort) {top = viewPort.top; height = viewPort.bottom - viewPort.top;}
-    top = Math.floor(top - paddingTop(display));
-    var bottom = Math.ceil(top + height);
-    return {from: lineAtHeight(doc, top), to: lineAtHeight(doc, bottom)};
-  }
-
-  // LINE NUMBERS
-
-  function alignHorizontally(cm) {
-    var display = cm.display;
-    if (!display.alignWidgets && (!display.gutters.firstChild || !cm.options.fixedGutter)) return;
-    var comp = compensateForHScroll(display) - display.scroller.scrollLeft + cm.doc.scrollLeft;
-    var gutterW = display.gutters.offsetWidth, l = comp + "px";
-    for (var n = display.lineDiv.firstChild; n; n = n.nextSibling) if (n.alignable) {
-      for (var i = 0, a = n.alignable; i < a.length; ++i) a[i].style.left = l;
-    }
-    if (cm.options.fixedGutter)
-      display.gutters.style.left = (comp + gutterW) + "px";
-  }
-
-  function maybeUpdateLineNumberWidth(cm) {
-    if (!cm.options.lineNumbers) return false;
-    var doc = cm.doc, last = lineNumberFor(cm.options, doc.first + doc.size - 1), display = cm.display;
-    if (last.length != display.lineNumChars) {
-      var test = display.measure.appendChild(elt("div", [elt("div", last)],
-                                                 "CodeMirror-linenumber CodeMirror-gutter-elt"));
-      var innerW = test.firstChild.offsetWidth, padding = test.offsetWidth - innerW;
-      display.lineGutter.style.width = "";
-      display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding);
-      display.lineNumWidth = display.lineNumInnerWidth + padding;
-      display.lineNumChars = display.lineNumInnerWidth ? last.length : -1;
-      display.lineGutter.style.width = display.lineNumWidth + "px";
-      return true;
-    }
-    return false;
-  }
-
-  function lineNumberFor(options, i) {
-    return String(options.lineNumberFormatter(i + options.firstLineNumber));
-  }
-  function compensateForHScroll(display) {
-    return getRect(display.scroller).left - getRect(display.sizer).left;
-  }
-
-  // DISPLAY DRAWING
-
-  function updateDisplay(cm, changes, viewPort, forced) {
-    var oldFrom = cm.display.showingFrom, oldTo = cm.display.showingTo, updated;
-    var visible = visibleLines(cm.display, cm.doc, viewPort);
-    for (;;) {
-      if (!updateDisplayInner(cm, changes, visible, forced)) break;
-      forced = false;
-      updated = true;
-      updateSelection(cm);
-      updateScrollbars(cm);
-
-      // Clip forced viewport to actual scrollable area
-      if (viewPort)
-        viewPort = Math.min(cm.display.scroller.scrollHeight - cm.display.scroller.clientHeight,
-                            typeof viewPort == "number" ? viewPort : viewPort.top);
-      visible = visibleLines(cm.display, cm.doc, viewPort);
-      if (visible.from >= cm.display.showingFrom && visible.to <= cm.display.showingTo)
-        break;
-      changes = [];
-    }
-
-    if (updated) {
-      signalLater(cm, "update", cm);
-      if (cm.display.showingFrom != oldFrom || cm.display.showingTo != oldTo)
-        signalLater(cm, "viewportChange", cm, cm.display.showingFrom, cm.display.showingTo);
-    }
-    return updated;
-  }
-
-  // Uses a set of changes plus the current scroll position to
-  // determine which DOM updates have to be made, and makes the
-  // updates.
-  function updateDisplayInner(cm, changes, visible, forced) {
-    var display = cm.display, doc = cm.doc;
-    if (!display.wrapper.clientWidth) {
-      display.showingFrom = display.showingTo = doc.first;
-      display.viewOffset = 0;
-      return;
-    }
-
-    // Bail out if the visible area is already rendered and nothing changed.
-    if (!forced && changes.length == 0 &&
-        visible.from > display.showingFrom && visible.to < display.showingTo)
-      return;
-
-    if (maybeUpdateLineNumberWidth(cm))
-      changes = [{from: doc.first, to: doc.first + doc.size}];
-    var gutterW = display.sizer.style.marginLeft = display.gutters.offsetWidth + "px";
-    display.scrollbarH.style.left = cm.options.fixedGutter ? gutterW : "0";
-
-    // Used to determine which lines need their line numbers updated
-    var positionsChangedFrom = Infinity;
-    if (cm.options.lineNumbers)
-      for (var i = 0; i < changes.length; ++i)
-        if (changes[i].diff && changes[i].from < positionsChangedFrom) { positionsChangedFrom = changes[i].from; }
-
-    var end = doc.first + doc.size;
-    var from = Math.max(visible.from - cm.options.viewportMargin, doc.first);
-    var to = Math.min(end, visible.to + cm.options.viewportMargin);
-    if (display.showingFrom < from && from - display.showingFrom < 20) from = Math.max(doc.first, display.showingFrom);
-    if (display.showingTo > to && display.showingTo - to < 20) to = Math.min(end, display.showingTo);
-    if (sawCollapsedSpans) {
-      from = lineNo(visualLine(doc, getLine(doc, from)));
-      while (to < end && lineIsHidden(doc, getLine(doc, to))) ++to;
-    }
-
-    // Create a range of theoretically intact lines, and punch holes
-    // in that using the change info.
-    var intact = [{from: Math.max(display.showingFrom, doc.first),
-                   to: Math.min(display.showingTo, end)}];
-    if (intact[0].from >= intact[0].to) intact = [];
-    else intact = computeIntact(intact, changes);
-    // When merged lines are present, we might have to reduce the
-    // intact ranges because changes in continued fragments of the
-    // intact lines do require the lines to be redrawn.
-    if (sawCollapsedSpans)
-      for (var i = 0; i < intact.length; ++i) {
-        var range = intact[i], merged;
-        while (merged = collapsedSpanAtEnd(getLine(doc, range.to - 1))) {
-          var newTo = merged.find().from.line;
-          if (newTo > range.from) range.to = newTo;
-          else { intact.splice(i--, 1); break; }
+  if (last) {
+    // Fix up .from in last (or move them into first in case of sameLine)
+    for (var i$1 = 0; i$1 < last.length; ++i$1) {
+      var span$1 = last[i$1]
+      if (span$1.to != null) { span$1.to += offset }
+      if (span$1.from == null) {
+        var found$1 = getMarkedSpanFor(first, span$1.marker)
+        if (!found$1) {
+          span$1.from = offset
+          if (sameLine) { (first || (first = [])).push(span$1) }
         }
-      }
-
-    // Clip off the parts that won't be visible
-    var intactLines = 0;
-    for (var i = 0; i < intact.length; ++i) {
-      var range = intact[i];
-      if (range.from < from) range.from = from;
-      if (range.to > to) range.to = to;
-      if (range.from >= range.to) intact.splice(i--, 1);
-      else intactLines += range.to - range.from;
-    }
-    if (!forced && intactLines == to - from && from == display.showingFrom && to == display.showingTo) {
-      updateViewOffset(cm);
-      return;
-    }
-    intact.sort(function(a, b) {return a.from - b.from;});
-
-    // Avoid crashing on IE's "unspecified error" when in iframes
-    try {
-      var focused = document.activeElement;
-    } catch(e) {}
-    if (intactLines < (to - from) * .7) display.lineDiv.style.display = "none";
-    patchDisplay(cm, from, to, intact, positionsChangedFrom);
-    display.lineDiv.style.display = "";
-    if (focused && document.activeElement != focused && focused.offsetHeight) focused.focus();
-
-    var different = from != display.showingFrom || to != display.showingTo ||
-      display.lastSizeC != display.wrapper.clientHeight;
-    // This is just a bogus formula that detects when the editor is
-    // resized or the font size changes.
-    if (different) {
-      display.lastSizeC = display.wrapper.clientHeight;
-      startWorker(cm, 400);
-    }
-    display.showingFrom = from; display.showingTo = to;
-
-    updateHeightsInViewport(cm);
-    updateViewOffset(cm);
-
-    return true;
-  }
-
-  function updateHeightsInViewport(cm) {
-    var display = cm.display;
-    var prevBottom = display.lineDiv.offsetTop;
-    for (var node = display.lineDiv.firstChild, height; node; node = node.nextSibling) if (node.lineObj) {
-      if (ie_lt8) {
-        var bot = node.offsetTop + node.offsetHeight;
-        height = bot - prevBottom;
-        prevBottom = bot;
       } else {
-        var box = getRect(node);
-        height = box.bottom - box.top;
-      }
-      var diff = node.lineObj.height - height;
-      if (height < 2) height = textHeight(display);
-      if (diff > .001 || diff < -.001) {
-        updateLineHeight(node.lineObj, height);
-        var widgets = node.lineObj.widgets;
-        if (widgets) for (var i = 0; i < widgets.length; ++i)
-          widgets[i].height = widgets[i].node.offsetHeight;
+        span$1.from += offset
+        if (sameLine) { (first || (first = [])).push(span$1) }
       }
     }
   }
+  // Make sure we didn't create any zero-length spans
+  if (first) { first = clearEmptySpans(first) }
+  if (last && last != first) { last = clearEmptySpans(last) }
 
-  function updateViewOffset(cm) {
-    var off = cm.display.viewOffset = heightAtLine(cm, getLine(cm.doc, cm.display.showingFrom));
-    // Position the mover div to align with the current virtual scroll position
-    cm.display.mover.style.top = off + "px";
+  var newMarkers = [first]
+  if (!sameLine) {
+    // Fill gap with whole-line-spans
+    var gap = change.text.length - 2, gapMarkers
+    if (gap > 0 && first)
+      { for (var i$2 = 0; i$2 < first.length; ++i$2)
+        { if (first[i$2].to == null)
+          { (gapMarkers || (gapMarkers = [])).push(new MarkedSpan(first[i$2].marker, null, null)) } } }
+    for (var i$3 = 0; i$3 < gap; ++i$3)
+      { newMarkers.push(gapMarkers) }
+    newMarkers.push(last)
+  }
+  return newMarkers
+}
+
+// Remove spans that are empty and don't have a clearWhenEmpty
+// option of false.
+function clearEmptySpans(spans) {
+  for (var i = 0; i < spans.length; ++i) {
+    var span = spans[i]
+    if (span.from != null && span.from == span.to && span.marker.clearWhenEmpty !== false)
+      { spans.splice(i--, 1) }
+  }
+  if (!spans.length) { return null }
+  return spans
+}
+
+// Used to 'clip' out readOnly ranges when making a change.
+function removeReadOnlyRanges(doc, from, to) {
+  var markers = null
+  doc.iter(from.line, to.line + 1, function (line) {
+    if (line.markedSpans) { for (var i = 0; i < line.markedSpans.length; ++i) {
+      var mark = line.markedSpans[i].marker
+      if (mark.readOnly && (!markers || indexOf(markers, mark) == -1))
+        { (markers || (markers = [])).push(mark) }
+    } }
+  })
+  if (!markers) { return null }
+  var parts = [{from: from, to: to}]
+  for (var i = 0; i < markers.length; ++i) {
+    var mk = markers[i], m = mk.find(0)
+    for (var j = 0; j < parts.length; ++j) {
+      var p = parts[j]
+      if (cmp(p.to, m.from) < 0 || cmp(p.from, m.to) > 0) { continue }
+      var newParts = [j, 1], dfrom = cmp(p.from, m.from), dto = cmp(p.to, m.to)
+      if (dfrom < 0 || !mk.inclusiveLeft && !dfrom)
+        { newParts.push({from: p.from, to: m.from}) }
+      if (dto > 0 || !mk.inclusiveRight && !dto)
+        { newParts.push({from: m.to, to: p.to}) }
+      parts.splice.apply(parts, newParts)
+      j += newParts.length - 3
+    }
+  }
+  return parts
+}
+
+// Connect or disconnect spans from a line.
+function detachMarkedSpans(line) {
+  var spans = line.markedSpans
+  if (!spans) { return }
+  for (var i = 0; i < spans.length; ++i)
+    { spans[i].marker.detachLine(line) }
+  line.markedSpans = null
+}
+function attachMarkedSpans(line, spans) {
+  if (!spans) { return }
+  for (var i = 0; i < spans.length; ++i)
+    { spans[i].marker.attachLine(line) }
+  line.markedSpans = spans
+}
+
+// Helpers used when computing which overlapping collapsed span
+// counts as the larger one.
+function extraLeft(marker) { return marker.inclusiveLeft ? -1 : 0 }
+function extraRight(marker) { return marker.inclusiveRight ? 1 : 0 }
+
+// Returns a number indicating which of two overlapping collapsed
+// spans is larger (and thus includes the other). Falls back to
+// comparing ids when the spans cover exactly the same range.
+function compareCollapsedMarkers(a, b) {
+  var lenDiff = a.lines.length - b.lines.length
+  if (lenDiff != 0) { return lenDiff }
+  var aPos = a.find(), bPos = b.find()
+  var fromCmp = cmp(aPos.from, bPos.from) || extraLeft(a) - extraLeft(b)
+  if (fromCmp) { return -fromCmp }
+  var toCmp = cmp(aPos.to, bPos.to) || extraRight(a) - extraRight(b)
+  if (toCmp) { return toCmp }
+  return b.id - a.id
+}
+
+// Find out whether a line ends or starts in a collapsed span. If
+// so, return the marker for that span.
+function collapsedSpanAtSide(line, start) {
+  var sps = sawCollapsedSpans && line.markedSpans, found
+  if (sps) { for (var sp = (void 0), i = 0; i < sps.length; ++i) {
+    sp = sps[i]
+    if (sp.marker.collapsed && (start ? sp.from : sp.to) == null &&
+        (!found || compareCollapsedMarkers(found, sp.marker) < 0))
+      { found = sp.marker }
+  } }
+  return found
+}
+function collapsedSpanAtStart(line) { return collapsedSpanAtSide(line, true) }
+function collapsedSpanAtEnd(line) { return collapsedSpanAtSide(line, false) }
+
+// Test whether there exists a collapsed span that partially
+// overlaps (covers the start or end, but not both) of a new span.
+// Such overlap is not allowed.
+function conflictingCollapsedRange(doc, lineNo, from, to, marker) {
+  var line = getLine(doc, lineNo)
+  var sps = sawCollapsedSpans && line.markedSpans
+  if (sps) { for (var i = 0; i < sps.length; ++i) {
+    var sp = sps[i]
+    if (!sp.marker.collapsed) { continue }
+    var found = sp.marker.find(0)
+    var fromCmp = cmp(found.from, from) || extraLeft(sp.marker) - extraLeft(marker)
+    var toCmp = cmp(found.to, to) || extraRight(sp.marker) - extraRight(marker)
+    if (fromCmp >= 0 && toCmp <= 0 || fromCmp <= 0 && toCmp >= 0) { continue }
+    if (fromCmp <= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.to, from) >= 0 : cmp(found.to, from) > 0) ||
+        fromCmp >= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.from, to) <= 0 : cmp(found.from, to) < 0))
+      { return true }
+  } }
+}
+
+// A visual line is a line as drawn on the screen. Folding, for
+// example, can cause multiple logical lines to appear on the same
+// visual line. This finds the start of the visual line that the
+// given line is part of (usually that is the line itself).
+function visualLine(line) {
+  var merged
+  while (merged = collapsedSpanAtStart(line))
+    { line = merged.find(-1, true).line }
+  return line
+}
+
+function visualLineEnd(line) {
+  var merged
+  while (merged = collapsedSpanAtEnd(line))
+    { line = merged.find(1, true).line }
+  return line
+}
+
+// Returns an array of logical lines that continue the visual line
+// started by the argument, or undefined if there are no such lines.
+function visualLineContinued(line) {
+  var merged, lines
+  while (merged = collapsedSpanAtEnd(line)) {
+    line = merged.find(1, true).line
+    ;(lines || (lines = [])).push(line)
+  }
+  return lines
+}
+
+// Get the line number of the start of the visual line that the
+// given line number is part of.
+function visualLineNo(doc, lineN) {
+  var line = getLine(doc, lineN), vis = visualLine(line)
+  if (line == vis) { return lineN }
+  return lineNo(vis)
+}
+
+// Get the line number of the start of the next visual line after
+// the given line.
+function visualLineEndNo(doc, lineN) {
+  if (lineN > doc.lastLine()) { return lineN }
+  var line = getLine(doc, lineN), merged
+  if (!lineIsHidden(doc, line)) { return lineN }
+  while (merged = collapsedSpanAtEnd(line))
+    { line = merged.find(1, true).line }
+  return lineNo(line) + 1
+}
+
+// Compute whether a line is hidden. Lines count as hidden when they
+// are part of a visual line that starts with another line, or when
+// they are entirely covered by collapsed, non-widget span.
+function lineIsHidden(doc, line) {
+  var sps = sawCollapsedSpans && line.markedSpans
+  if (sps) { for (var sp = (void 0), i = 0; i < sps.length; ++i) {
+    sp = sps[i]
+    if (!sp.marker.collapsed) { continue }
+    if (sp.from == null) { return true }
+    if (sp.marker.widgetNode) { continue }
+    if (sp.from == 0 && sp.marker.inclusiveLeft && lineIsHiddenInner(doc, line, sp))
+      { return true }
+  } }
+}
+function lineIsHiddenInner(doc, line, span) {
+  if (span.to == null) {
+    var end = span.marker.find(1, true)
+    return lineIsHiddenInner(doc, end.line, getMarkedSpanFor(end.line.markedSpans, span.marker))
+  }
+  if (span.marker.inclusiveRight && span.to == line.text.length)
+    { return true }
+  for (var sp = (void 0), i = 0; i < line.markedSpans.length; ++i) {
+    sp = line.markedSpans[i]
+    if (sp.marker.collapsed && !sp.marker.widgetNode && sp.from == span.to &&
+        (sp.to == null || sp.to != span.from) &&
+        (sp.marker.inclusiveLeft || span.marker.inclusiveRight) &&
+        lineIsHiddenInner(doc, line, sp)) { return true }
+  }
+}
+
+// Find the height above the given line.
+function heightAtLine(lineObj) {
+  lineObj = visualLine(lineObj)
+
+  var h = 0, chunk = lineObj.parent
+  for (var i = 0; i < chunk.lines.length; ++i) {
+    var line = chunk.lines[i]
+    if (line == lineObj) { break }
+    else { h += line.height }
+  }
+  for (var p = chunk.parent; p; chunk = p, p = chunk.parent) {
+    for (var i$1 = 0; i$1 < p.children.length; ++i$1) {
+      var cur = p.children[i$1]
+      if (cur == chunk) { break }
+      else { h += cur.height }
+    }
+  }
+  return h
+}
+
+// Compute the character length of a line, taking into account
+// collapsed ranges (see markText) that might hide parts, and join
+// other lines onto it.
+function lineLength(line) {
+  if (line.height == 0) { return 0 }
+  var len = line.text.length, merged, cur = line
+  while (merged = collapsedSpanAtStart(cur)) {
+    var found = merged.find(0, true)
+    cur = found.from.line
+    len += found.from.ch - found.to.ch
+  }
+  cur = line
+  while (merged = collapsedSpanAtEnd(cur)) {
+    var found$1 = merged.find(0, true)
+    len -= cur.text.length - found$1.from.ch
+    cur = found$1.to.line
+    len += cur.text.length - found$1.to.ch
+  }
+  return len
+}
+
+// Find the longest line in the document.
+function findMaxLine(cm) {
+  var d = cm.display, doc = cm.doc
+  d.maxLine = getLine(doc, doc.first)
+  d.maxLineLength = lineLength(d.maxLine)
+  d.maxLineChanged = true
+  doc.iter(function (line) {
+    var len = lineLength(line)
+    if (len > d.maxLineLength) {
+      d.maxLineLength = len
+      d.maxLine = line
+    }
+  })
+}
+
+// BIDI HELPERS
+
+function iterateBidiSections(order, from, to, f) {
+  if (!order) { return f(from, to, "ltr") }
+  var found = false
+  for (var i = 0; i < order.length; ++i) {
+    var part = order[i]
+    if (part.from < to && part.to > from || from == to && part.to == from) {
+      f(Math.max(part.from, from), Math.min(part.to, to), part.level == 1 ? "rtl" : "ltr")
+      found = true
+    }
+  }
+  if (!found) { f(from, to, "ltr") }
+}
+
+var bidiOther = null
+function getBidiPartAt(order, ch, sticky) {
+  var found
+  bidiOther = null
+  for (var i = 0; i < order.length; ++i) {
+    var cur = order[i]
+    if (cur.from < ch && cur.to > ch) { return i }
+    if (cur.to == ch) {
+      if (cur.from != cur.to && sticky == "before") { found = i }
+      else { bidiOther = i }
+    }
+    if (cur.from == ch) {
+      if (cur.from != cur.to && sticky != "before") { found = i }
+      else { bidiOther = i }
+    }
+  }
+  return found != null ? found : bidiOther
+}
+
+// Bidirectional ordering algorithm
+// See http://unicode.org/reports/tr9/tr9-13.html for the algorithm
+// that this (partially) implements.
+
+// One-char codes used for character types:
+// L (L):   Left-to-Right
+// R (R):   Right-to-Left
+// r (AL):  Right-to-Left Arabic
+// 1 (EN):  European Number
+// + (ES):  European Number Separator
+// % (ET):  European Number Terminator
+// n (AN):  Arabic Number
+// , (CS):  Common Number Separator
+// m (NSM): Non-Spacing Mark
+// b (BN):  Boundary Neutral
+// s (B):   Paragraph Separator
+// t (S):   Segment Separator
+// w (WS):  Whitespace
+// N (ON):  Other Neutrals
+
+// Returns null if characters are ordered as they appear
+// (left-to-right), or an array of sections ({from, to, level}
+// objects) in the order in which they occur visually.
+var bidiOrdering = (function() {
+  // Character types for codepoints 0 to 0xff
+  var lowTypes = "bbbbbbbbbtstwsbbbbbbbbbbbbbbssstwNN%%%NNNNNN,N,N1111111111NNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNbbbbbbsbbbbbbbbbbbbbbbbbbbbbbbbbb,N%%%%NNNNLNNNNN%%11NLNNN1LNNNNNLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLN"
+  // Character types for codepoints 0x600 to 0x6f9
+  var arabicTypes = "nnnnnnNNr%%r,rNNmmmmmmmmmmmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmmmmmmmnnnnnnnnnn%nnrrrmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmnNmmmmmmrrmmNmmmmrr1111111111"
+  function charType(code) {
+    if (code <= 0xf7) { return lowTypes.charAt(code) }
+    else if (0x590 <= code && code <= 0x5f4) { return "R" }
+    else if (0x600 <= code && code <= 0x6f9) { return arabicTypes.charAt(code - 0x600) }
+    else if (0x6ee <= code && code <= 0x8ac) { return "r" }
+    else if (0x2000 <= code && code <= 0x200b) { return "w" }
+    else if (code == 0x200c) { return "b" }
+    else { return "L" }
   }
 
-  function computeIntact(intact, changes) {
-    for (var i = 0, l = changes.length || 0; i < l; ++i) {
-      var change = changes[i], intact2 = [], diff = change.diff || 0;
-      for (var j = 0, l2 = intact.length; j < l2; ++j) {
-        var range = intact[j];
-        if (change.to <= range.from && change.diff) {
-          intact2.push({from: range.from + diff, to: range.to + diff});
-        } else if (change.to <= range.from || change.from >= range.to) {
-          intact2.push(range);
-        } else {
-          if (change.from > range.from)
-            intact2.push({from: range.from, to: change.from});
-          if (change.to < range.to)
-            intact2.push({from: change.to + diff, to: range.to + diff});
-        }
+  var bidiRE = /[\u0590-\u05f4\u0600-\u06ff\u0700-\u08ac]/
+  var isNeutral = /[stwN]/, isStrong = /[LRr]/, countsAsLeft = /[Lb1n]/, countsAsNum = /[1n]/
+
+  function BidiSpan(level, from, to) {
+    this.level = level
+    this.from = from; this.to = to
+  }
+
+  return function(str, direction) {
+    var outerType = direction == "ltr" ? "L" : "R"
+
+    if (str.length == 0 || direction == "ltr" && !bidiRE.test(str)) { return false }
+    var len = str.length, types = []
+    for (var i = 0; i < len; ++i)
+      { types.push(charType(str.charCodeAt(i))) }
+
+    // W1. Examine each non-spacing mark (NSM) in the level run, and
+    // change the type of the NSM to the type of the previous
+    // character. If the NSM is at the start of the level run, it will
+    // get the type of sor.
+    for (var i$1 = 0, prev = outerType; i$1 < len; ++i$1) {
+      var type = types[i$1]
+      if (type == "m") { types[i$1] = prev }
+      else { prev = type }
+    }
+
+    // W2. Search backwards from each instance of a European number
+    // until the first strong type (R, L, AL, or sor) is found. If an
+    // AL is found, change the type of the European number to Arabic
+    // number.
+    // W3. Change all ALs to R.
+    for (var i$2 = 0, cur = outerType; i$2 < len; ++i$2) {
+      var type$1 = types[i$2]
+      if (type$1 == "1" && cur == "r") { types[i$2] = "n" }
+      else if (isStrong.test(type$1)) { cur = type$1; if (type$1 == "r") { types[i$2] = "R" } }
+    }
+
+    // W4. A single European separator between two European numbers
+    // changes to a European number. A single common separator between
+    // two numbers of the same type changes to that type.
+    for (var i$3 = 1, prev$1 = types[0]; i$3 < len - 1; ++i$3) {
+      var type$2 = types[i$3]
+      if (type$2 == "+" && prev$1 == "1" && types[i$3+1] == "1") { types[i$3] = "1" }
+      else if (type$2 == "," && prev$1 == types[i$3+1] &&
+               (prev$1 == "1" || prev$1 == "n")) { types[i$3] = prev$1 }
+      prev$1 = type$2
+    }
+
+    // W5. A sequence of European terminators adjacent to European
+    // numbers changes to all European numbers.
+    // W6. Otherwise, separators and terminators change to Other
+    // Neutral.
+    for (var i$4 = 0; i$4 < len; ++i$4) {
+      var type$3 = types[i$4]
+      if (type$3 == ",") { types[i$4] = "N" }
+      else if (type$3 == "%") {
+        var end = (void 0)
+        for (end = i$4 + 1; end < len && types[end] == "%"; ++end) {}
+        var replace = (i$4 && types[i$4-1] == "!") || (end < len && types[end] == "1") ? "1" : "N"
+        for (var j = i$4; j < end; ++j) { types[j] = replace }
+        i$4 = end - 1
       }
-      intact = intact2;
     }
-    return intact;
-  }
 
-  function getDimensions(cm) {
-    var d = cm.display, left = {}, width = {};
-    for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {
-      left[cm.options.gutters[i]] = n.offsetLeft;
-      width[cm.options.gutters[i]] = n.offsetWidth;
+    // W7. Search backwards from each instance of a European number
+    // until the first strong type (R, L, or sor) is found. If an L is
+    // found, then change the type of the European number to L.
+    for (var i$5 = 0, cur$1 = outerType; i$5 < len; ++i$5) {
+      var type$4 = types[i$5]
+      if (cur$1 == "L" && type$4 == "1") { types[i$5] = "L" }
+      else if (isStrong.test(type$4)) { cur$1 = type$4 }
     }
-    return {fixedPos: compensateForHScroll(d),
-            gutterTotalWidth: d.gutters.offsetWidth,
-            gutterLeft: left,
-            gutterWidth: width,
-            wrapperWidth: d.wrapper.clientWidth};
-  }
 
-  function patchDisplay(cm, from, to, intact, updateNumbersFrom) {
-    var dims = getDimensions(cm);
-    var display = cm.display, lineNumbers = cm.options.lineNumbers;
-    if (!intact.length && (!webkit || !cm.display.currentWheelTarget))
-      removeChildren(display.lineDiv);
-    var container = display.lineDiv, cur = container.firstChild;
+    // N1. A sequence of neutrals takes the direction of the
+    // surrounding strong text if the text on both sides has the same
+    // direction. European and Arabic numbers act as if they were R in
+    // terms of their influence on neutrals. Start-of-level-run (sor)
+    // and end-of-level-run (eor) are used at level run boundaries.
+    // N2. Any remaining neutrals take the embedding direction.
+    for (var i$6 = 0; i$6 < len; ++i$6) {
+      if (isNeutral.test(types[i$6])) {
+        var end$1 = (void 0)
+        for (end$1 = i$6 + 1; end$1 < len && isNeutral.test(types[end$1]); ++end$1) {}
+        var before = (i$6 ? types[i$6-1] : outerType) == "L"
+        var after = (end$1 < len ? types[end$1] : outerType) == "L"
+        var replace$1 = before == after ? (before ? "L" : "R") : outerType
+        for (var j$1 = i$6; j$1 < end$1; ++j$1) { types[j$1] = replace$1 }
+        i$6 = end$1 - 1
+      }
+    }
 
-    function rm(node) {
-      var next = node.nextSibling;
-      if (webkit && mac && cm.display.currentWheelTarget == node) {
-        node.style.display = "none";
-        node.lineObj = null;
+    // Here we depart from the documented algorithm, in order to avoid
+    // building up an actual levels array. Since there are only three
+    // levels (0, 1, 2) in an implementation that doesn't take
+    // explicit embedding into account, we can build up the order on
+    // the fly, without following the level-based algorithm.
+    var order = [], m
+    for (var i$7 = 0; i$7 < len;) {
+      if (countsAsLeft.test(types[i$7])) {
+        var start = i$7
+        for (++i$7; i$7 < len && countsAsLeft.test(types[i$7]); ++i$7) {}
+        order.push(new BidiSpan(0, start, i$7))
       } else {
-        node.parentNode.removeChild(node);
+        var pos = i$7, at = order.length
+        for (++i$7; i$7 < len && types[i$7] != "L"; ++i$7) {}
+        for (var j$2 = pos; j$2 < i$7;) {
+          if (countsAsNum.test(types[j$2])) {
+            if (pos < j$2) { order.splice(at, 0, new BidiSpan(1, pos, j$2)) }
+            var nstart = j$2
+            for (++j$2; j$2 < i$7 && countsAsNum.test(types[j$2]); ++j$2) {}
+            order.splice(at, 0, new BidiSpan(2, nstart, j$2))
+            pos = j$2
+          } else { ++j$2 }
+        }
+        if (pos < i$7) { order.splice(at, 0, new BidiSpan(1, pos, i$7)) }
       }
-      return next;
+    }
+    if (order[0].level == 1 && (m = str.match(/^\s+/))) {
+      order[0].from = m[0].length
+      order.unshift(new BidiSpan(0, 0, m[0].length))
+    }
+    if (lst(order).level == 1 && (m = str.match(/\s+$/))) {
+      lst(order).to -= m[0].length
+      order.push(new BidiSpan(0, len - m[0].length, len))
     }
 
-    var nextIntact = intact.shift(), lineN = from;
-    cm.doc.iter(from, to, function(line) {
-      if (nextIntact && nextIntact.to == lineN) nextIntact = intact.shift();
-      if (lineIsHidden(cm.doc, line)) {
-        if (line.height != 0) updateLineHeight(line, 0);
-        if (line.widgets && cur && cur.previousSibling) for (var i = 0; i < line.widgets.length; ++i) {
-          var w = line.widgets[i];
-          if (w.showIfHidden) {
-            var prev = cur.previousSibling;
-            if (/pre/i.test(prev.nodeName)) {
-              var wrap = elt("div", null, null, "position: relative");
-              prev.parentNode.replaceChild(wrap, prev);
-              wrap.appendChild(prev);
-              prev = wrap;
-            }
-            var wnode = prev.appendChild(elt("div", [w.node], "CodeMirror-linewidget"));
-            if (!w.handleMouseEvents) wnode.ignoreEvents = true;
-            positionLineWidget(w, wnode, prev, dims);
-          }
-        }
-      } else if (nextIntact && nextIntact.from <= lineN && nextIntact.to > lineN) {
-        // This line is intact. Skip to the actual node. Update its
-        // line number if needed.
-        while (cur.lineObj != line) cur = rm(cur);
-        if (lineNumbers && updateNumbersFrom <= lineN && cur.lineNumber)
-          setTextContent(cur.lineNumber, lineNumberFor(cm.options, lineN));
-        cur = cur.nextSibling;
-      } else {
-        // For lines with widgets, make an attempt to find and reuse
-        // the existing element, so that widgets aren't needlessly
-        // removed and re-inserted into the dom
-        if (line.widgets) for (var j = 0, search = cur, reuse; search && j < 20; ++j, search = search.nextSibling)
-          if (search.lineObj == line && /div/i.test(search.nodeName)) { reuse = search; break; }
-        // This line needs to be generated.
-        var lineNode = buildLineElement(cm, line, lineN, dims, reuse);
-        if (lineNode != reuse) {
-          container.insertBefore(lineNode, cur);
-        } else {
-          while (cur != reuse) cur = rm(cur);
-          cur = cur.nextSibling;
-        }
+    return direction == "rtl" ? order.reverse() : order
+  }
+})()
 
-        lineNode.lineObj = line;
-      }
-      ++lineN;
-    });
-    while (cur) cur = rm(cur);
+// Get the bidi ordering for the given line (and cache it). Returns
+// false for lines that are fully left-to-right, and an array of
+// BidiSpan objects otherwise.
+function getOrder(line, direction) {
+  var order = line.order
+  if (order == null) { order = line.order = bidiOrdering(line.text, direction) }
+  return order
+}
+
+function moveCharLogically(line, ch, dir) {
+  var target = skipExtendingChars(line.text, ch + dir, dir)
+  return target < 0 || target > line.text.length ? null : target
+}
+
+function moveLogically(line, start, dir) {
+  var ch = moveCharLogically(line, start.ch, dir)
+  return ch == null ? null : new Pos(start.line, ch, dir < 0 ? "after" : "before")
+}
+
+function endOfLine(visually, cm, lineObj, lineNo, dir) {
+  if (visually) {
+    var order = getOrder(lineObj, cm.doc.direction)
+    if (order) {
+      var part = dir < 0 ? lst(order) : order[0]
+      var moveInStorageOrder = (dir < 0) == (part.level == 1)
+      var sticky = moveInStorageOrder ? "after" : "before"
+      var ch
+      // With a wrapped rtl chunk (possibly spanning multiple bidi parts),
+      // it could be that the last bidi part is not on the last visual line,
+      // since visual lines contain content order-consecutive chunks.
+      // Thus, in rtl, we are looking for the first (content-order) character
+      // in the rtl chunk that is on the last line (that is, the same line
+      // as the last (content-order) character).
+      if (part.level > 0) {
+        var prep = prepareMeasureForLine(cm, lineObj)
+        ch = dir < 0 ? lineObj.text.length - 1 : 0
+        var targetTop = measureCharPrepared(cm, prep, ch).top
+        ch = findFirst(function (ch) { return measureCharPrepared(cm, prep, ch).top == targetTop; }, (dir < 0) == (part.level == 1) ? part.from : part.to - 1, ch)
+        if (sticky == "before") { ch = moveCharLogically(lineObj, ch, 1, true) }
+      } else { ch = dir < 0 ? part.to : part.from }
+      return new Pos(lineNo, ch, sticky)
+    }
+  }
+  return new Pos(lineNo, dir < 0 ? lineObj.text.length : 0, dir < 0 ? "before" : "after")
+}
+
+function moveVisually(cm, line, start, dir) {
+  var bidi = getOrder(line, cm.doc.direction)
+  if (!bidi) { return moveLogically(line, start, dir) }
+  if (start.ch >= line.text.length) {
+    start.ch = line.text.length
+    start.sticky = "before"
+  } else if (start.ch <= 0) {
+    start.ch = 0
+    start.sticky = "after"
+  }
+  var partPos = getBidiPartAt(bidi, start.ch, start.sticky), part = bidi[partPos]
+  if (cm.doc.direction == "ltr" && part.level % 2 == 0 && (dir > 0 ? part.to > start.ch : part.from < start.ch)) {
+    // Case 1: We move within an ltr part in an ltr editor. Even with wrapped lines,
+    // nothing interesting happens.
+    return moveLogically(line, start, dir)
   }
 
-  function buildLineElement(cm, line, lineNo, dims, reuse) {
-    var lineElement = lineContent(cm, line);
-    var markers = line.gutterMarkers, display = cm.display, wrap;
-
-    if (!cm.options.lineNumbers && !markers && !line.bgClass && !line.wrapClass && !line.widgets)
-      return lineElement;
-
-    // Lines with gutter elements, widgets or a background class need
-    // to be wrapped again, and have the extra elements added to the
-    // wrapper div
-
-    if (reuse) {
-      reuse.alignable = null;
-      var isOk = true, widgetsSeen = 0, insertBefore = null;
-      for (var n = reuse.firstChild, next; n; n = next) {
-        next = n.nextSibling;
-        if (!/\bCodeMirror-linewidget\b/.test(n.className)) {
-          reuse.removeChild(n);
-        } else {
-          for (var i = 0; i < line.widgets.length; ++i) {
-            var widget = line.widgets[i];
-            if (widget.node == n.firstChild) {
-              if (!widget.above && !insertBefore) insertBefore = n;
-              positionLineWidget(widget, n, reuse, dims);
-              ++widgetsSeen;
-              break;
-            }
-          }
-          if (i == line.widgets.length) { isOk = false; break; }
-        }
-      }
-      reuse.insertBefore(lineElement, insertBefore);
-      if (isOk && widgetsSeen == line.widgets.length) {
-        wrap = reuse;
-        reuse.className = line.wrapClass || "";
-      }
-    }
-    if (!wrap) {
-      wrap = elt("div", null, line.wrapClass, "position: relative");
-      wrap.appendChild(lineElement);
-    }
-    // Kludge to make sure the styled element lies behind the selection (by z-index)
-    if (line.bgClass)
-      wrap.insertBefore(elt("div", null, line.bgClass + " CodeMirror-linebackground"), wrap.firstChild);
-    if (cm.options.lineNumbers || markers) {
-      var gutterWrap = wrap.insertBefore(elt("div", null, null, "position: absolute; left: " +
-                                             (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px"),
-                                         wrap.firstChild);
-      if (cm.options.fixedGutter) (wrap.alignable || (wrap.alignable = [])).push(gutterWrap);
-      if (cm.options.lineNumbers && (!markers || !markers["CodeMirror-linenumbers"]))
-        wrap.lineNumber = gutterWrap.appendChild(
-          elt("div", lineNumberFor(cm.options, lineNo),
-              "CodeMirror-linenumber CodeMirror-gutter-elt",
-              "left: " + dims.gutterLeft["CodeMirror-linenumbers"] + "px; width: "
-              + display.lineNumInnerWidth + "px"));
-      if (markers)
-        for (var k = 0; k < cm.options.gutters.length; ++k) {
-          var id = cm.options.gutters[k], found = markers.hasOwnProperty(id) && markers[id];
-          if (found)
-            gutterWrap.appendChild(elt("div", [found], "CodeMirror-gutter-elt", "left: " +
-                                       dims.gutterLeft[id] + "px; width: " + dims.gutterWidth[id] + "px"));
-        }
-    }
-    if (ie_lt8) wrap.style.zIndex = 2;
-    if (line.widgets && wrap != reuse) for (var i = 0, ws = line.widgets; i < ws.length; ++i) {
-      var widget = ws[i], node = elt("div", [widget.node], "CodeMirror-linewidget");
-      if (!widget.handleMouseEvents) node.ignoreEvents = true;
-      positionLineWidget(widget, node, wrap, dims);
-      if (widget.above)
-        wrap.insertBefore(node, cm.options.lineNumbers && line.height != 0 ? gutterWrap : lineElement);
-      else
-        wrap.appendChild(node);
-      signalLater(widget, "redraw");
-    }
-    return wrap;
+  var mv = function (pos, dir) { return moveCharLogically(line, pos instanceof Pos ? pos.ch : pos, dir); }
+  var prep
+  var getWrappedLineExtent = function (ch) {
+    if (!cm.options.lineWrapping) { return {begin: 0, end: line.text.length} }
+    prep = prep || prepareMeasureForLine(cm, line)
+    return wrappedLineExtentChar(cm, line, prep, ch)
   }
+  var wrappedLineExtent = getWrappedLineExtent(start.sticky == "before" ? mv(start, -1) : start.ch)
 
-  function positionLineWidget(widget, node, wrap, dims) {
-    if (widget.noHScroll) {
-      (wrap.alignable || (wrap.alignable = [])).push(node);
-      var width = dims.wrapperWidth;
-      node.style.left = dims.fixedPos + "px";
-      if (!widget.coverGutter) {
-        width -= dims.gutterTotalWidth;
-        node.style.paddingLeft = dims.gutterTotalWidth + "px";
-      }
-      node.style.width = width + "px";
-    }
-    if (widget.coverGutter) {
-      node.style.zIndex = 5;
-      node.style.position = "relative";
-      if (!widget.noHScroll) node.style.marginLeft = -dims.gutterTotalWidth + "px";
+  if (cm.doc.direction == "rtl" || part.level == 1) {
+    var moveInStorageOrder = (part.level == 1) == (dir < 0)
+    var ch = mv(start, moveInStorageOrder ? 1 : -1)
+    if (ch != null && (!moveInStorageOrder ? ch >= part.from && ch >= wrappedLineExtent.begin : ch <= part.to && ch <= wrappedLineExtent.end)) {
+      // Case 2: We move within an rtl part or in an rtl editor on the same visual line
+      var sticky = moveInStorageOrder ? "before" : "after"
+      return new Pos(start.line, ch, sticky)
     }
   }
 
-  // SELECTION / CURSOR
+  // Case 3: Could not move within this bidi part in this visual line, so leave
+  // the current bidi part
 
-  function updateSelection(cm) {
-    var display = cm.display;
-    var collapsed = posEq(cm.doc.sel.from, cm.doc.sel.to);
-    if (collapsed || cm.options.showCursorWhenSelecting)
-      updateSelectionCursor(cm);
-    else
-      display.cursor.style.display = display.otherCursor.style.display = "none";
-    if (!collapsed)
-      updateSelectionRange(cm);
-    else
-      display.selectionDiv.style.display = "none";
+  var searchInVisualLine = function (partPos, dir, wrappedLineExtent) {
+    var getRes = function (ch, moveInStorageOrder) { return moveInStorageOrder
+      ? new Pos(start.line, mv(ch, 1), "before")
+      : new Pos(start.line, ch, "after"); }
 
-    // Move the hidden textarea near the cursor to prevent scrolling artifacts
-    if (cm.options.moveInputWithCursor) {
-      var headPos = cursorCoords(cm, cm.doc.sel.head, "div");
-      var wrapOff = getRect(display.wrapper), lineOff = getRect(display.lineDiv);
-      display.inputDiv.style.top = Math.max(0, Math.min(display.wrapper.clientHeight - 10,
-                                                        headPos.top + lineOff.top - wrapOff.top)) + "px";
-      display.inputDiv.style.left = Math.max(0, Math.min(display.wrapper.clientWidth - 10,
-                                                         headPos.left + lineOff.left - wrapOff.left)) + "px";
+    for (; partPos >= 0 && partPos < bidi.length; partPos += dir) {
+      var part = bidi[partPos]
+      var moveInStorageOrder = (dir > 0) == (part.level != 1)
+      var ch = moveInStorageOrder ? wrappedLineExtent.begin : mv(wrappedLineExtent.end, -1)
+      if (part.from <= ch && ch < part.to) { return getRes(ch, moveInStorageOrder) }
+      ch = moveInStorageOrder ? part.from : mv(part.to, -1)
+      if (wrappedLineExtent.begin <= ch && ch < wrappedLineExtent.end) { return getRes(ch, moveInStorageOrder) }
     }
   }
 
-  // No selection, plain cursor
-  function updateSelectionCursor(cm) {
-    var display = cm.display, pos = cursorCoords(cm, cm.doc.sel.head, "div");
-    display.cursor.style.left = pos.left + "px";
-    display.cursor.style.top = pos.top + "px";
-    display.cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px";
-    display.cursor.style.display = "";
+  // Case 3a: Look for other bidi parts on the same visual line
+  var res = searchInVisualLine(partPos + dir, dir, wrappedLineExtent)
+  if (res) { return res }
 
-    if (pos.other) {
-      display.otherCursor.style.display = "";
-      display.otherCursor.style.left = pos.other.left + "px";
-      display.otherCursor.style.top = pos.other.top + "px";
-      display.otherCursor.style.height = (pos.other.bottom - pos.other.top) * .85 + "px";
-    } else { display.otherCursor.style.display = "none"; }
+  // Case 3b: Look for other bidi parts on the next visual line
+  var nextCh = dir > 0 ? wrappedLineExtent.end : mv(wrappedLineExtent.begin, -1)
+  if (nextCh != null && !(dir > 0 && nextCh == line.text.length)) {
+    res = searchInVisualLine(dir > 0 ? 0 : bidi.length - 1, dir, getWrappedLineExtent(nextCh))
+    if (res) { return res }
   }
 
-  // Highlight selection
-  function updateSelectionRange(cm) {
-    var display = cm.display, doc = cm.doc, sel = cm.doc.sel;
-    var fragment = document.createDocumentFragment();
-    var clientWidth = display.lineSpace.offsetWidth, pl = paddingLeft(cm.display);
+  // Case 4: Nowhere to move
+  return null
+}
 
-    function add(left, top, width, bottom) {
-      if (top < 0) top = 0;
-      fragment.appendChild(elt("div", null, "CodeMirror-selected", "position: absolute; left: " + left +
-                               "px; top: " + top + "px; width: " + (width == null ? clientWidth - left : width) +
-                               "px; height: " + (bottom - top) + "px"));
+// EVENT HANDLING
+
+// Lightweight event framework. on/off also work on DOM nodes,
+// registering native DOM handlers.
+
+var noHandlers = []
+
+var on = function(emitter, type, f) {
+  if (emitter.addEventListener) {
+    emitter.addEventListener(type, f, false)
+  } else if (emitter.attachEvent) {
+    emitter.attachEvent("on" + type, f)
+  } else {
+    var map = emitter._handlers || (emitter._handlers = {})
+    map[type] = (map[type] || noHandlers).concat(f)
+  }
+}
+
+function getHandlers(emitter, type) {
+  return emitter._handlers && emitter._handlers[type] || noHandlers
+}
+
+function off(emitter, type, f) {
+  if (emitter.removeEventListener) {
+    emitter.removeEventListener(type, f, false)
+  } else if (emitter.detachEvent) {
+    emitter.detachEvent("on" + type, f)
+  } else {
+    var map = emitter._handlers, arr = map && map[type]
+    if (arr) {
+      var index = indexOf(arr, f)
+      if (index > -1)
+        { map[type] = arr.slice(0, index).concat(arr.slice(index + 1)) }
     }
+  }
+}
 
-    function drawForLine(line, fromArg, toArg) {
-      var lineObj = getLine(doc, line);
-      var lineLen = lineObj.text.length;
-      var start, end;
-      function coords(ch, bias) {
-        return charCoords(cm, Pos(line, ch), "div", lineObj, bias);
-      }
+function signal(emitter, type /*, values...*/) {
+  var handlers = getHandlers(emitter, type)
+  if (!handlers.length) { return }
+  var args = Array.prototype.slice.call(arguments, 2)
+  for (var i = 0; i < handlers.length; ++i) { handlers[i].apply(null, args) }
+}
 
-      iterateBidiSections(getOrder(lineObj), fromArg || 0, toArg == null ? lineLen : toArg, function(from, to, dir) {
-        var leftPos = coords(from, "left"), rightPos, left, right;
-        if (from == to) {
-          rightPos = leftPos;
-          left = right = leftPos.left;
-        } else {
-          rightPos = coords(to - 1, "right");
-          if (dir == "rtl") { var tmp = leftPos; leftPos = rightPos; rightPos = tmp; }
-          left = leftPos.left;
-          right = rightPos.right;
-        }
-        if (fromArg == null && from == 0) left = pl;
-        if (rightPos.top - leftPos.top > 3) { // Different lines, draw top part
-          add(left, leftPos.top, null, leftPos.bottom);
-          left = pl;
-          if (leftPos.bottom < rightPos.top) add(left, leftPos.bottom, null, rightPos.top);
-        }
-        if (toArg == null && to == lineLen) right = clientWidth;
-        if (!start || leftPos.top < start.top || leftPos.top == start.top && leftPos.left < start.left)
-          start = leftPos;
-        if (!end || rightPos.bottom > end.bottom || rightPos.bottom == end.bottom && rightPos.right > end.right)
-          end = rightPos;
-        if (left < pl + 1) left = pl;
-        add(left, rightPos.top, right - left, rightPos.bottom);
-      });
-      return {start: start, end: end};
-    }
+// The DOM events that CodeMirror handles can be overridden by
+// registering a (non-DOM) handler on the editor for the event name,
+// and preventDefault-ing the event in that handler.
+function signalDOMEvent(cm, e, override) {
+  if (typeof e == "string")
+    { e = {type: e, preventDefault: function() { this.defaultPrevented = true }} }
+  signal(cm, override || e.type, cm, e)
+  return e_defaultPrevented(e) || e.codemirrorIgnore
+}
 
-    if (sel.from.line == sel.to.line) {
-      drawForLine(sel.from.line, sel.from.ch, sel.to.ch);
+function signalCursorActivity(cm) {
+  var arr = cm._handlers && cm._handlers.cursorActivity
+  if (!arr) { return }
+  var set = cm.curOp.cursorActivityHandlers || (cm.curOp.cursorActivityHandlers = [])
+  for (var i = 0; i < arr.length; ++i) { if (indexOf(set, arr[i]) == -1)
+    { set.push(arr[i]) } }
+}
+
+function hasHandler(emitter, type) {
+  return getHandlers(emitter, type).length > 0
+}
+
+// Add on and off methods to a constructor's prototype, to make
+// registering events on such objects more convenient.
+function eventMixin(ctor) {
+  ctor.prototype.on = function(type, f) {on(this, type, f)}
+  ctor.prototype.off = function(type, f) {off(this, type, f)}
+}
+
+// Due to the fact that we still support jurassic IE versions, some
+// compatibility wrappers are needed.
+
+function e_preventDefault(e) {
+  if (e.preventDefault) { e.preventDefault() }
+  else { e.returnValue = false }
+}
+function e_stopPropagation(e) {
+  if (e.stopPropagation) { e.stopPropagation() }
+  else { e.cancelBubble = true }
+}
+function e_defaultPrevented(e) {
+  return e.defaultPrevented != null ? e.defaultPrevented : e.returnValue == false
+}
+function e_stop(e) {e_preventDefault(e); e_stopPropagation(e)}
+
+function e_target(e) {return e.target || e.srcElement}
+function e_button(e) {
+  var b = e.which
+  if (b == null) {
+    if (e.button & 1) { b = 1 }
+    else if (e.button & 2) { b = 3 }
+    else if (e.button & 4) { b = 2 }
+  }
+  if (mac && e.ctrlKey && b == 1) { b = 3 }
+  return b
+}
+
+// Detect drag-and-drop
+var dragAndDrop = function() {
+  // There is *some* kind of drag-and-drop support in IE6-8, but I
+  // couldn't get it to work yet.
+  if (ie && ie_version < 9) { return false }
+  var div = elt('div')
+  return "draggable" in div || "dragDrop" in div
+}()
+
+var zwspSupported
+function zeroWidthElement(measure) {
+  if (zwspSupported == null) {
+    var test = elt("span", "\u200b")
+    removeChildrenAndAdd(measure, elt("span", [test, document.createTextNode("x")]))
+    if (measure.firstChild.offsetHeight != 0)
+      { zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !(ie && ie_version < 8) }
+  }
+  var node = zwspSupported ? elt("span", "\u200b") :
+    elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px")
+  node.setAttribute("cm-text", "")
+  return node
+}
+
+// Feature-detect IE's crummy client rect reporting for bidi text
+var badBidiRects
+function hasBadBidiRects(measure) {
+  if (badBidiRects != null) { return badBidiRects }
+  var txt = removeChildrenAndAdd(measure, document.createTextNode("A\u062eA"))
+  var r0 = range(txt, 0, 1).getBoundingClientRect()
+  var r1 = range(txt, 1, 2).getBoundingClientRect()
+  removeChildren(measure)
+  if (!r0 || r0.left == r0.right) { return false } // Safari returns null in some cases (#2780)
+  return badBidiRects = (r1.right - r0.right < 3)
+}
+
+// See if "".split is the broken IE version, if so, provide an
+// alternative way to split lines.
+var splitLinesAuto = "\n\nb".split(/\n/).length != 3 ? function (string) {
+  var pos = 0, result = [], l = string.length
+  while (pos <= l) {
+    var nl = string.indexOf("\n", pos)
+    if (nl == -1) { nl = string.length }
+    var line = string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl)
+    var rt = line.indexOf("\r")
+    if (rt != -1) {
+      result.push(line.slice(0, rt))
+      pos += rt + 1
     } else {
-      var fromLine = getLine(doc, sel.from.line), toLine = getLine(doc, sel.to.line);
-      var singleVLine = visualLine(doc, fromLine) == visualLine(doc, toLine);
-      var leftEnd = drawForLine(sel.from.line, sel.from.ch, singleVLine ? fromLine.text.length : null).end;
-      var rightStart = drawForLine(sel.to.line, singleVLine ? 0 : null, sel.to.ch).start;
-      if (singleVLine) {
-        if (leftEnd.top < rightStart.top - 2) {
-          add(leftEnd.right, leftEnd.top, null, leftEnd.bottom);
-          add(pl, rightStart.top, rightStart.left, rightStart.bottom);
-        } else {
-          add(leftEnd.right, leftEnd.top, rightStart.left - leftEnd.right, leftEnd.bottom);
-        }
-      }
-      if (leftEnd.bottom < rightStart.top)
-        add(pl, leftEnd.bottom, null, rightStart.top);
+      result.push(line)
+      pos = nl + 1
     }
-
-    removeChildrenAndAdd(display.selectionDiv, fragment);
-    display.selectionDiv.style.display = "";
   }
+  return result
+} : function (string) { return string.split(/\r\n?|\n/); }
 
-  // Cursor-blinking
-  function restartBlink(cm) {
-    if (!cm.state.focused) return;
-    var display = cm.display;
-    clearInterval(display.blinker);
-    var on = true;
-    display.cursor.style.visibility = display.otherCursor.style.visibility = "";
-    if (cm.options.cursorBlinkRate > 0)
-      display.blinker = setInterval(function() {
-        display.cursor.style.visibility = display.otherCursor.style.visibility = (on = !on) ? "" : "hidden";
-      }, cm.options.cursorBlinkRate);
+var hasSelection = window.getSelection ? function (te) {
+  try { return te.selectionStart != te.selectionEnd }
+  catch(e) { return false }
+} : function (te) {
+  var range
+  try {range = te.ownerDocument.selection.createRange()}
+  catch(e) {}
+  if (!range || range.parentElement() != te) { return false }
+  return range.compareEndPoints("StartToEnd", range) != 0
+}
+
+var hasCopyEvent = (function () {
+  var e = elt("div")
+  if ("oncopy" in e) { return true }
+  e.setAttribute("oncopy", "return;")
+  return typeof e.oncopy == "function"
+})()
+
+var badZoomedRects = null
+function hasBadZoomedRects(measure) {
+  if (badZoomedRects != null) { return badZoomedRects }
+  var node = removeChildrenAndAdd(measure, elt("span", "x"))
+  var normal = node.getBoundingClientRect()
+  var fromRange = range(node, 0, 1).getBoundingClientRect()
+  return badZoomedRects = Math.abs(normal.left - fromRange.left) > 1
+}
+
+var modes = {};
+var mimeModes = {};
+// Extra arguments are stored as the mode's dependencies, which is
+// used by (legacy) mechanisms like loadmode.js to automatically
+// load a mode. (Preferred mechanism is the require/define calls.)
+function defineMode(name, mode) {
+  if (arguments.length > 2)
+    { mode.dependencies = Array.prototype.slice.call(arguments, 2) }
+  modes[name] = mode
+}
+
+function defineMIME(mime, spec) {
+  mimeModes[mime] = spec
+}
+
+// Given a MIME type, a {name, ...options} config object, or a name
+// string, return a mode config object.
+function resolveMode(spec) {
+  if (typeof spec == "string" && mimeModes.hasOwnProperty(spec)) {
+    spec = mimeModes[spec]
+  } else if (spec && typeof spec.name == "string" && mimeModes.hasOwnProperty(spec.name)) {
+    var found = mimeModes[spec.name]
+    if (typeof found == "string") { found = {name: found} }
+    spec = createObj(found, spec)
+    spec.name = found.name
+  } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec)) {
+    return resolveMode("application/xml")
+  } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+json$/.test(spec)) {
+    return resolveMode("application/json")
   }
+  if (typeof spec == "string") { return {name: spec} }
+  else { return spec || {name: "null"} }
+}
 
-  // HIGHLIGHT WORKER
-
-  function startWorker(cm, time) {
-    if (cm.doc.mode.startState && cm.doc.frontier < cm.display.showingTo)
-      cm.state.highlight.set(time, bind(highlightWorker, cm));
+// Given a mode spec (anything that resolveMode accepts), find and
+// initialize an actual mode object.
+function getMode(options, spec) {
+  spec = resolveMode(spec)
+  var mfactory = modes[spec.name]
+  if (!mfactory) { return getMode(options, "text/plain") }
+  var modeObj = mfactory(options, spec)
+  if (modeExtensions.hasOwnProperty(spec.name)) {
+    var exts = modeExtensions[spec.name]
+    for (var prop in exts) {
+      if (!exts.hasOwnProperty(prop)) { continue }
+      if (modeObj.hasOwnProperty(prop)) { modeObj["_" + prop] = modeObj[prop] }
+      modeObj[prop] = exts[prop]
+    }
   }
+  modeObj.name = spec.name
+  if (spec.helperType) { modeObj.helperType = spec.helperType }
+  if (spec.modeProps) { for (var prop$1 in spec.modeProps)
+    { modeObj[prop$1] = spec.modeProps[prop$1] } }
 
-  function highlightWorker(cm) {
-    var doc = cm.doc;
-    if (doc.frontier < doc.first) doc.frontier = doc.first;
-    if (doc.frontier >= cm.display.showingTo) return;
-    var end = +new Date + cm.options.workTime;
-    var state = copyState(doc.mode, getStateBefore(cm, doc.frontier));
-    var changed = [], prevChange;
-    doc.iter(doc.frontier, Math.min(doc.first + doc.size, cm.display.showingTo + 500), function(line) {
-      if (doc.frontier >= cm.display.showingFrom) { // Visible
-        var oldStyles = line.styles;
-        line.styles = highlightLine(cm, line, state);
-        var ischange = !oldStyles || oldStyles.length != line.styles.length;
-        for (var i = 0; !ischange && i < oldStyles.length; ++i) ischange = oldStyles[i] != line.styles[i];
-        if (ischange) {
-          if (prevChange && prevChange.end == doc.frontier) prevChange.end++;
-          else changed.push(prevChange = {start: doc.frontier, end: doc.frontier + 1});
-        }
-        line.stateAfter = copyState(doc.mode, state);
+  return modeObj
+}
+
+// This can be used to attach properties to mode objects from
+// outside the actual mode definition.
+var modeExtensions = {}
+function extendMode(mode, properties) {
+  var exts = modeExtensions.hasOwnProperty(mode) ? modeExtensions[mode] : (modeExtensions[mode] = {})
+  copyObj(properties, exts)
+}
+
+function copyState(mode, state) {
+  if (state === true) { return state }
+  if (mode.copyState) { return mode.copyState(state) }
+  var nstate = {}
+  for (var n in state) {
+    var val = state[n]
+    if (val instanceof Array) { val = val.concat([]) }
+    nstate[n] = val
+  }
+  return nstate
+}
+
+// Given a mode and a state (for that mode), find the inner mode and
+// state at the position that the state refers to.
+function innerMode(mode, state) {
+  var info
+  while (mode.innerMode) {
+    info = mode.innerMode(state)
+    if (!info || info.mode == mode) { break }
+    state = info.state
+    mode = info.mode
+  }
+  return info || {mode: mode, state: state}
+}
+
+function startState(mode, a1, a2) {
+  return mode.startState ? mode.startState(a1, a2) : true
+}
+
+// STRING STREAM
+
+// Fed to the mode parsers, provides helper functions to make
+// parsers more succinct.
+
+var StringStream = function(string, tabSize) {
+  this.pos = this.start = 0
+  this.string = string
+  this.tabSize = tabSize || 8
+  this.lastColumnPos = this.lastColumnValue = 0
+  this.lineStart = 0
+};
+
+StringStream.prototype.eol = function () {return this.pos >= this.string.length};
+StringStream.prototype.sol = function () {return this.pos == this.lineStart};
+StringStream.prototype.peek = function () {return this.string.charAt(this.pos) || undefined};
+StringStream.prototype.next = function () {
+  if (this.pos < this.string.length)
+    { return this.string.charAt(this.pos++) }
+};
+StringStream.prototype.eat = function (match) {
+  var ch = this.string.charAt(this.pos)
+  var ok
+  if (typeof match == "string") { ok = ch == match }
+  else { ok = ch && (match.test ? match.test(ch) : match(ch)) }
+  if (ok) {++this.pos; return ch}
+};
+StringStream.prototype.eatWhile = function (match) {
+  var start = this.pos
+  while (this.eat(match)){}
+  return this.pos > start
+};
+StringStream.prototype.eatSpace = function () {
+    var this$1 = this;
+
+  var start = this.pos
+  while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) { ++this$1.pos }
+  return this.pos > start
+};
+StringStream.prototype.skipToEnd = function () {this.pos = this.string.length};
+StringStream.prototype.skipTo = function (ch) {
+  var found = this.string.indexOf(ch, this.pos)
+  if (found > -1) {this.pos = found; return true}
+};
+StringStream.prototype.backUp = function (n) {this.pos -= n};
+StringStream.prototype.column = function () {
+  if (this.lastColumnPos < this.start) {
+    this.lastColumnValue = countColumn(this.string, this.start, this.tabSize, this.lastColumnPos, this.lastColumnValue)
+    this.lastColumnPos = this.start
+  }
+  return this.lastColumnValue - (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)
+};
+StringStream.prototype.indentation = function () {
+  return countColumn(this.string, null, this.tabSize) -
+    (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)
+};
+StringStream.prototype.match = function (pattern, consume, caseInsensitive) {
+  if (typeof pattern == "string") {
+    var cased = function (str) { return caseInsensitive ? str.toLowerCase() : str; }
+    var substr = this.string.substr(this.pos, pattern.length)
+    if (cased(substr) == cased(pattern)) {
+      if (consume !== false) { this.pos += pattern.length }
+      return true
+    }
+  } else {
+    var match = this.string.slice(this.pos).match(pattern)
+    if (match && match.index > 0) { return null }
+    if (match && consume !== false) { this.pos += match[0].length }
+    return match
+  }
+};
+StringStream.prototype.current = function (){return this.string.slice(this.start, this.pos)};
+StringStream.prototype.hideFirstChars = function (n, inner) {
+  this.lineStart += n
+  try { return inner() }
+  finally { this.lineStart -= n }
+};
+
+// Compute a style array (an array starting with a mode generation
+// -- for invalidation -- followed by pairs of end positions and
+// style strings), which is used to highlight the tokens on the
+// line.
+function highlightLine(cm, line, state, forceToEnd) {
+  // A styles array always starts with a number identifying the
+  // mode/overlays that it is based on (for easy invalidation).
+  var st = [cm.state.modeGen], lineClasses = {}
+  // Compute the base array of styles
+  runMode(cm, line.text, cm.doc.mode, state, function (end, style) { return st.push(end, style); },
+    lineClasses, forceToEnd)
+
+  // Run overlays, adjust style array.
+  var loop = function ( o ) {
+    var overlay = cm.state.overlays[o], i = 1, at = 0
+    runMode(cm, line.text, overlay.mode, true, function (end, style) {
+      var start = i
+      // Ensure there's a token end at the current position, and that i points at it
+      while (at < end) {
+        var i_end = st[i]
+        if (i_end > end)
+          { st.splice(i, 1, end, st[i+1], i_end) }
+        i += 2
+        at = Math.min(end, i_end)
+      }
+      if (!style) { return }
+      if (overlay.opaque) {
+        st.splice(start, i - start, end, "overlay " + style)
+        i = start + 2
       } else {
-        processLine(cm, line, state);
-        line.stateAfter = doc.frontier % 5 == 0 ? copyState(doc.mode, state) : null;
-      }
-      ++doc.frontier;
-      if (+new Date > end) {
-        startWorker(cm, cm.options.workDelay);
-        return true;
-      }
-    });
-    if (changed.length)
-      operation(cm, function() {
-        for (var i = 0; i < changed.length; ++i)
-          regChange(this, changed[i].start, changed[i].end);
-      })();
-  }
-
-  // Finds the line to start with when starting a parse. Tries to
-  // find a line with a stateAfter, so that it can start with a
-  // valid state. If that fails, it returns the line with the
-  // smallest indentation, which tends to need the least context to
-  // parse correctly.
-  function findStartLine(cm, n, precise) {
-    var minindent, minline, doc = cm.doc, maxScan = cm.doc.mode.innerMode ? 1000 : 100;
-    for (var search = n, lim = n - maxScan; search > lim; --search) {
-      if (search <= doc.first) return doc.first;
-      var line = getLine(doc, search - 1);
-      if (line.stateAfter && (!precise || search <= doc.frontier)) return search;
-      var indented = countColumn(line.text, null, cm.options.tabSize);
-      if (minline == null || minindent > indented) {
-        minline = search - 1;
-        minindent = indented;
-      }
-    }
-    return minline;
-  }
-
-  function getStateBefore(cm, n, precise) {
-    var doc = cm.doc, display = cm.display;
-    if (!doc.mode.startState) return true;
-    var pos = findStartLine(cm, n, precise), state = pos > doc.first && getLine(doc, pos-1).stateAfter;
-    if (!state) state = startState(doc.mode);
-    else state = copyState(doc.mode, state);
-    doc.iter(pos, n, function(line) {
-      processLine(cm, line, state);
-      var save = pos == n - 1 || pos % 5 == 0 || pos >= display.showingFrom && pos < display.showingTo;
-      line.stateAfter = save ? copyState(doc.mode, state) : null;
-      ++pos;
-    });
-    return state;
-  }
-
-  // POSITION MEASUREMENT
-
-  function paddingTop(display) {return display.lineSpace.offsetTop;}
-  function paddingVert(display) {return display.mover.offsetHeight - display.lineSpace.offsetHeight;}
-  function paddingLeft(display) {
-    var e = removeChildrenAndAdd(display.measure, elt("pre", null, null, "text-align: left")).appendChild(elt("span", "x"));
-    return e.offsetLeft;
-  }
-
-  function measureChar(cm, line, ch, data, bias) {
-    var dir = -1;
-    data = data || measureLine(cm, line);
-
-    for (var pos = ch;; pos += dir) {
-      var r = data[pos];
-      if (r) break;
-      if (dir < 0 && pos == 0) dir = 1;
-    }
-    bias = pos > ch ? "left" : pos < ch ? "right" : bias;
-    if (bias == "left" && r.leftSide) r = r.leftSide;
-    else if (bias == "right" && r.rightSide) r = r.rightSide;
-    return {left: pos < ch ? r.right : r.left,
-            right: pos > ch ? r.left : r.right,
-            top: r.top,
-            bottom: r.bottom};
-  }
-
-  function findCachedMeasurement(cm, line) {
-    var cache = cm.display.measureLineCache;
-    for (var i = 0; i < cache.length; ++i) {
-      var memo = cache[i];
-      if (memo.text == line.text && memo.markedSpans == line.markedSpans &&
-          cm.display.scroller.clientWidth == memo.width &&
-          memo.classes == line.textClass + "|" + line.bgClass + "|" + line.wrapClass)
-        return memo;
-    }
-  }
-
-  function clearCachedMeasurement(cm, line) {
-    var exists = findCachedMeasurement(cm, line);
-    if (exists) exists.text = exists.measure = exists.markedSpans = null;
-  }
-
-  function measureLine(cm, line) {
-    // First look in the cache
-    var cached = findCachedMeasurement(cm, line);
-    if (cached) return cached.measure;
-
-    // Failing that, recompute and store result in cache
-    var measure = measureLineInner(cm, line);
-    var cache = cm.display.measureLineCache;
-    var memo = {text: line.text, width: cm.display.scroller.clientWidth,
-                markedSpans: line.markedSpans, measure: measure,
-                classes: line.textClass + "|" + line.bgClass + "|" + line.wrapClass};
-    if (cache.length == 16) cache[++cm.display.measureLineCachePos % 16] = memo;
-    else cache.push(memo);
-    return measure;
-  }
-
-  function measureLineInner(cm, line) {
-    var display = cm.display, measure = emptyArray(line.text.length);
-    var pre = lineContent(cm, line, measure, true);
-
-    // IE does not cache element positions of inline elements between
-    // calls to getBoundingClientRect. This makes the loop below,
-    // which gathers the positions of all the characters on the line,
-    // do an amount of layout work quadratic to the number of
-    // characters. When line wrapping is off, we try to improve things
-    // by first subdividing the line into a bunch of inline blocks, so
-    // that IE can reuse most of the layout information from caches
-    // for those blocks. This does interfere with line wrapping, so it
-    // doesn't work when wrapping is on, but in that case the
-    // situation is slightly better, since IE does cache line-wrapping
-    // information and only recomputes per-line.
-    if (ie && !ie_lt8 && !cm.options.lineWrapping && pre.childNodes.length > 100) {
-      var fragment = document.createDocumentFragment();
-      var chunk = 10, n = pre.childNodes.length;
-      for (var i = 0, chunks = Math.ceil(n / chunk); i < chunks; ++i) {
-        var wrap = elt("div", null, null, "display: inline-block");
-        for (var j = 0; j < chunk && n; ++j) {
-          wrap.appendChild(pre.firstChild);
-          --n;
-        }
-        fragment.appendChild(wrap);
-      }
-      pre.appendChild(fragment);
-    }
-
-    removeChildrenAndAdd(display.measure, pre);
-
-    var outer = getRect(display.lineDiv);
-    var vranges = [], data = emptyArray(line.text.length), maxBot = pre.offsetHeight;
-    // Work around an IE7/8 bug where it will sometimes have randomly
-    // replaced our pre with a clone at this point.
-    if (ie_lt9 && display.measure.first != pre)
-      removeChildrenAndAdd(display.measure, pre);
-
-    function measureRect(rect) {
-      var top = rect.top - outer.top, bot = rect.bottom - outer.top;
-      if (bot > maxBot) bot = maxBot;
-      if (top < 0) top = 0;
-      for (var i = vranges.length - 2; i >= 0; i -= 2) {
-        var rtop = vranges[i], rbot = vranges[i+1];
-        if (rtop > bot || rbot < top) continue;
-        if (rtop <= top && rbot >= bot ||
-            top <= rtop && bot >= rbot ||
-            Math.min(bot, rbot) - Math.max(top, rtop) >= (bot - top) >> 1) {
-          vranges[i] = Math.min(top, rtop);
-          vranges[i+1] = Math.max(bot, rbot);
-          break;
+        for (; start < i; start += 2) {
+          var cur = st[start+1]
+          st[start+1] = (cur ? cur + " " : "") + "overlay " + style
         }
       }
-      if (i < 0) { i = vranges.length; vranges.push(top, bot); }
-      return {left: rect.left - outer.left,
-              right: rect.right - outer.left,
-              top: i, bottom: null};
-    }
-    function finishRect(rect) {
-      rect.bottom = vranges[rect.top+1];
-      rect.top = vranges[rect.top];
-    }
-
-    for (var i = 0, cur; i < measure.length; ++i) if (cur = measure[i]) {
-      var node = cur, rect = null;
-      // A widget might wrap, needs special care
-      if (/\bCodeMirror-widget\b/.test(cur.className) && cur.getClientRects) {
-        if (cur.firstChild.nodeType == 1) node = cur.firstChild;
-        var rects = node.getClientRects();
-        if (rects.length > 1) {
-          rect = data[i] = measureRect(rects[0]);
-          rect.rightSide = measureRect(rects[rects.length - 1]);
-        }
-      }
-      if (!rect) rect = data[i] = measureRect(getRect(node));
-      if (cur.measureRight) rect.right = getRect(cur.measureRight).left;
-      if (cur.leftSide) rect.leftSide = measureRect(getRect(cur.leftSide));
-    }
-    removeChildren(cm.display.measure);
-    for (var i = 0, cur; i < data.length; ++i) if (cur = data[i]) {
-      finishRect(cur);
-      if (cur.leftSide) finishRect(cur.leftSide);
-      if (cur.rightSide) finishRect(cur.rightSide);
-    }
-    return data;
-  }
-
-  function measureLineWidth(cm, line) {
-    var hasBadSpan = false;
-    if (line.markedSpans) for (var i = 0; i < line.markedSpans; ++i) {
-      var sp = line.markedSpans[i];
-      if (sp.collapsed && (sp.to == null || sp.to == line.text.length)) hasBadSpan = true;
-    }
-    var cached = !hasBadSpan && findCachedMeasurement(cm, line);
-    if (cached) return measureChar(cm, line, line.text.length, cached.measure, "right").right;
-
-    var pre = lineContent(cm, line, null, true);
-    var end = pre.appendChild(zeroWidthElement(cm.display.measure));
-    removeChildrenAndAdd(cm.display.measure, pre);
-    return getRect(end).right - getRect(cm.display.lineDiv).left;
-  }
-
-  function clearCaches(cm) {
-    cm.display.measureLineCache.length = cm.display.measureLineCachePos = 0;
-    cm.display.cachedCharWidth = cm.display.cachedTextHeight = null;
-    if (!cm.options.lineWrapping) cm.display.maxLineChanged = true;
-    cm.display.lineNumChars = null;
-  }
-
-  function pageScrollX() { return window.pageXOffset || (document.documentElement || document.body).scrollLeft; }
-  function pageScrollY() { return window.pageYOffset || (document.documentElement || document.body).scrollTop; }
-
-  // Context is one of "line", "div" (display.lineDiv), "local"/null (editor), or "page"
-  function intoCoordSystem(cm, lineObj, rect, context) {
-    if (lineObj.widgets) for (var i = 0; i < lineObj.widgets.length; ++i) if (lineObj.widgets[i].above) {
-      var size = widgetHeight(lineObj.widgets[i]);
-      rect.top += size; rect.bottom += size;
-    }
-    if (context == "line") return rect;
-    if (!context) context = "local";
-    var yOff = heightAtLine(cm, lineObj);
-    if (context == "local") yOff += paddingTop(cm.display);
-    else yOff -= cm.display.viewOffset;
-    if (context == "page" || context == "window") {
-      var lOff = getRect(cm.display.lineSpace);
-      yOff += lOff.top + (context == "window" ? 0 : pageScrollY());
-      var xOff = lOff.left + (context == "window" ? 0 : pageScrollX());
-      rect.left += xOff; rect.right += xOff;
-    }
-    rect.top += yOff; rect.bottom += yOff;
-    return rect;
-  }
-
-  // Context may be "window", "page", "div", or "local"/null
-  // Result is in "div" coords
-  function fromCoordSystem(cm, coords, context) {
-    if (context == "div") return coords;
-    var left = coords.left, top = coords.top;
-    // First move into "page" coordinate system
-    if (context == "page") {
-      left -= pageScrollX();
-      top -= pageScrollY();
-    } else if (context == "local" || !context) {
-      var localBox = getRect(cm.display.sizer);
-      left += localBox.left;
-      top += localBox.top;
-    }
-
-    var lineSpaceBox = getRect(cm.display.lineSpace);
-    return {left: left - lineSpaceBox.left, top: top - lineSpaceBox.top};
-  }
-
-  function charCoords(cm, pos, context, lineObj, bias) {
-    if (!lineObj) lineObj = getLine(cm.doc, pos.line);
-    return intoCoordSystem(cm, lineObj, measureChar(cm, lineObj, pos.ch, null, bias), context);
-  }
-
-  function cursorCoords(cm, pos, context, lineObj, measurement) {
-    lineObj = lineObj || getLine(cm.doc, pos.line);
-    if (!measurement) measurement = measureLine(cm, lineObj);
-    function get(ch, right) {
-      var m = measureChar(cm, lineObj, ch, measurement, right ? "right" : "left");
-      if (right) m.left = m.right; else m.right = m.left;
-      return intoCoordSystem(cm, lineObj, m, context);
-    }
-    function getBidi(ch, partPos) {
-      var part = order[partPos], right = part.level % 2;
-      if (ch == bidiLeft(part) && partPos && part.level < order[partPos - 1].level) {
-        part = order[--partPos];
-        ch = bidiRight(part) - (part.level % 2 ? 0 : 1);
-        right = true;
-      } else if (ch == bidiRight(part) && partPos < order.length - 1 && part.level < order[partPos + 1].level) {
-        part = order[++partPos];
-        ch = bidiLeft(part) - part.level % 2;
-        right = false;
-      }
-      if (right && ch == part.to && ch > part.from) return get(ch - 1);
-      return get(ch, right);
-    }
-    var order = getOrder(lineObj), ch = pos.ch;
-    if (!order) return get(ch);
-    var partPos = getBidiPartAt(order, ch);
-    var val = getBidi(ch, partPos);
-    if (bidiOther != null) val.other = getBidi(ch, bidiOther);
-    return val;
-  }
-
-  function PosWithInfo(line, ch, outside, xRel) {
-    var pos = new Pos(line, ch);
-    pos.xRel = xRel;
-    if (outside) pos.outside = true;
-    return pos;
-  }
-
-  // Coords must be lineSpace-local
-  function coordsChar(cm, x, y) {
-    var doc = cm.doc;
-    y += cm.display.viewOffset;
-    if (y < 0) return PosWithInfo(doc.first, 0, true, -1);
-    var lineNo = lineAtHeight(doc, y), last = doc.first + doc.size - 1;
-    if (lineNo > last)
-      return PosWithInfo(doc.first + doc.size - 1, getLine(doc, last).text.length, true, 1);
-    if (x < 0) x = 0;
-
-    for (;;) {
-      var lineObj = getLine(doc, lineNo);
-      var found = coordsCharInner(cm, lineObj, lineNo, x, y);
-      var merged = collapsedSpanAtEnd(lineObj);
-      var mergedPos = merged && merged.find();
-      if (merged && (found.ch > mergedPos.from.ch || found.ch == mergedPos.from.ch && found.xRel > 0))
-        lineNo = mergedPos.to.line;
-      else
-        return found;
-    }
-  }
-
-  function coordsCharInner(cm, lineObj, lineNo, x, y) {
-    var innerOff = y - heightAtLine(cm, lineObj);
-    var wrongLine = false, adjust = 2 * cm.display.wrapper.clientWidth;
-    var measurement = measureLine(cm, lineObj);
-
-    function getX(ch) {
-      var sp = cursorCoords(cm, Pos(lineNo, ch), "line",
-                            lineObj, measurement);
-      wrongLine = true;
-      if (innerOff > sp.bottom) return sp.left - adjust;
-      else if (innerOff < sp.top) return sp.left + adjust;
-      else wrongLine = false;
-      return sp.left;
-    }
-
-    var bidi = getOrder(lineObj), dist = lineObj.text.length;
-    var from = lineLeft(lineObj), to = lineRight(lineObj);
-    var fromX = getX(from), fromOutside = wrongLine, toX = getX(to), toOutside = wrongLine;
-
-    if (x > toX) return PosWithInfo(lineNo, to, toOutside, 1);
-    // Do a binary search between these bounds.
-    for (;;) {
-      if (bidi ? to == from || to == moveVisually(lineObj, from, 1) : to - from <= 1) {
-        var ch = x < fromX || x - fromX <= toX - x ? from : to;
-        var xDiff = x - (ch == from ? fromX : toX);
-        while (isExtendingChar.test(lineObj.text.charAt(ch))) ++ch;
-        var pos = PosWithInfo(lineNo, ch, ch == from ? fromOutside : toOutside,
-                              xDiff < 0 ? -1 : xDiff ? 1 : 0);
-        return pos;
-      }
-      var step = Math.ceil(dist / 2), middle = from + step;
-      if (bidi) {
-        middle = from;
-        for (var i = 0; i < step; ++i) middle = moveVisually(lineObj, middle, 1);
-      }
-      var middleX = getX(middle);
-      if (middleX > x) {to = middle; toX = middleX; if (toOutside = wrongLine) toX += 1000; dist = step;}
-      else {from = middle; fromX = middleX; fromOutside = wrongLine; dist -= step;}
-    }
-  }
-
-  var measureText;
-  function textHeight(display) {
-    if (display.cachedTextHeight != null) return display.cachedTextHeight;
-    if (measureText == null) {
-      measureText = elt("pre");
-      // Measure a bunch of lines, for browsers that compute
-      // fractional heights.
-      for (var i = 0; i < 49; ++i) {
-        measureText.appendChild(document.createTextNode("x"));
-        measureText.appendChild(elt("br"));
-      }
-      measureText.appendChild(document.createTextNode("x"));
-    }
-    removeChildrenAndAdd(display.measure, measureText);
-    var height = measureText.offsetHeight / 50;
-    if (height > 3) display.cachedTextHeight = height;
-    removeChildren(display.measure);
-    return height || 1;
-  }
-
-  function charWidth(display) {
-    if (display.cachedCharWidth != null) return display.cachedCharWidth;
-    var anchor = elt("span", "x");
-    var pre = elt("pre", [anchor]);
-    removeChildrenAndAdd(display.measure, pre);
-    var width = anchor.offsetWidth;
-    if (width > 2) display.cachedCharWidth = width;
-    return width || 10;
-  }
-
-  // OPERATIONS
-
-  // Operations are used to wrap changes in such a way that each
-  // change won't have to update the cursor and display (which would
-  // be awkward, slow, and error-prone), but instead updates are
-  // batched and then all combined and executed at once.
-
-  var nextOpId = 0;
-  function startOperation(cm) {
-    cm.curOp = {
-      // An array of ranges of lines that have to be updated. See
-      // updateDisplay.
-      changes: [],
-      forceUpdate: false,
-      updateInput: null,
-      userSelChange: null,
-      textChanged: null,
-      selectionChanged: false,
-      cursorActivity: false,
-      updateMaxLine: false,
-      updateScrollPos: false,
-      id: ++nextOpId
-    };
-    if (!delayedCallbackDepth++) delayedCallbacks = [];
-  }
-
-  function endOperation(cm) {
-    var op = cm.curOp, doc = cm.doc, display = cm.display;
-    cm.curOp = null;
-
-    if (op.updateMaxLine) computeMaxLength(cm);
-    if (display.maxLineChanged && !cm.options.lineWrapping && display.maxLine) {
-      var width = measureLineWidth(cm, display.maxLine);
-      display.sizer.style.minWidth = Math.max(0, width + 3 + scrollerCutOff) + "px";
-      display.maxLineChanged = false;
-      var maxScrollLeft = Math.max(0, display.sizer.offsetLeft + display.sizer.offsetWidth - display.scroller.clientWidth);
-      if (maxScrollLeft < doc.scrollLeft && !op.updateScrollPos)
-        setScrollLeft(cm, Math.min(display.scroller.scrollLeft, maxScrollLeft), true);
-    }
-    var newScrollPos, updated;
-    if (op.updateScrollPos) {
-      newScrollPos = op.updateScrollPos;
-    } else if (op.selectionChanged && display.scroller.clientHeight) { // don't rescroll if not visible
-      var coords = cursorCoords(cm, doc.sel.head);
-      newScrollPos = calculateScrollPos(cm, coords.left, coords.top, coords.left, coords.bottom);
-    }
-    if (op.changes.length || op.forceUpdate || newScrollPos && newScrollPos.scrollTop != null) {
-      updated = updateDisplay(cm, op.changes, newScrollPos && newScrollPos.scrollTop, op.forceUpdate);
-      if (cm.display.scroller.offsetHeight) cm.doc.scrollTop = cm.display.scroller.scrollTop;
-    }
-    if (!updated && op.selectionChanged) updateSelection(cm);
-    if (op.updateScrollPos) {
-      display.scroller.scrollTop = display.scrollbarV.scrollTop = doc.scrollTop = newScrollPos.scrollTop;
-      display.scroller.scrollLeft = display.scrollbarH.scrollLeft = doc.scrollLeft = newScrollPos.scrollLeft;
-      alignHorizontally(cm);
-      if (op.scrollToPos)
-        scrollPosIntoView(cm, clipPos(cm.doc, op.scrollToPos), op.scrollToPosMargin);
-    } else if (newScrollPos) {
-      scrollCursorIntoView(cm);
-    }
-    if (op.selectionChanged) restartBlink(cm);
-
-    if (cm.state.focused && op.updateInput)
-      resetInput(cm, op.userSelChange);
-
-    var hidden = op.maybeHiddenMarkers, unhidden = op.maybeUnhiddenMarkers;
-    if (hidden) for (var i = 0; i < hidden.length; ++i)
-      if (!hidden[i].lines.length) signal(hidden[i], "hide");
-    if (unhidden) for (var i = 0; i < unhidden.length; ++i)
-      if (unhidden[i].lines.length) signal(unhidden[i], "unhide");
-
-    var delayed;
-    if (!--delayedCallbackDepth) {
-      delayed = delayedCallbacks;
-      delayedCallbacks = null;
-    }
-    if (op.textChanged)
-      signal(cm, "change", cm, op.textChanged);
-    if (op.cursorActivity) signal(cm, "cursorActivity", cm);
-    if (delayed) for (var i = 0; i < delayed.length; ++i) delayed[i]();
-  }
-
-  // Wraps a function in an operation. Returns the wrapped function.
-  function operation(cm1, f) {
-    return function() {
-      var cm = cm1 || this, withOp = !cm.curOp;
-      if (withOp) startOperation(cm);
-      try { var result = f.apply(cm, arguments); }
-      finally { if (withOp) endOperation(cm); }
-      return result;
-    };
-  }
-  function docOperation(f) {
-    return function() {
-      var withOp = this.cm && !this.cm.curOp, result;
-      if (withOp) startOperation(this.cm);
-      try { result = f.apply(this, arguments); }
-      finally { if (withOp) endOperation(this.cm); }
-      return result;
-    };
-  }
-  function runInOp(cm, f) {
-    var withOp = !cm.curOp, result;
-    if (withOp) startOperation(cm);
-    try { result = f(); }
-    finally { if (withOp) endOperation(cm); }
-    return result;
-  }
-
-  function regChange(cm, from, to, lendiff) {
-    if (from == null) from = cm.doc.first;
-    if (to == null) to = cm.doc.first + cm.doc.size;
-    cm.curOp.changes.push({from: from, to: to, diff: lendiff});
-  }
-
-  // INPUT HANDLING
-
-  function slowPoll(cm) {
-    if (cm.display.pollingFast) return;
-    cm.display.poll.set(cm.options.pollInterval, function() {
-      readInput(cm);
-      if (cm.state.focused) slowPoll(cm);
-    });
-  }
-
-  function fastPoll(cm) {
-    var missed = false;
-    cm.display.pollingFast = true;
-    function p() {
-      var changed = readInput(cm);
-      if (!changed && !missed) {missed = true; cm.display.poll.set(60, p);}
-      else {cm.display.pollingFast = false; slowPoll(cm);}
-    }
-    cm.display.poll.set(20, p);
-  }
-
-  // prevInput is a hack to work with IME. If we reset the textarea
-  // on every change, that breaks IME. So we look for changes
-  // compared to the previous content instead. (Modern browsers have
-  // events that indicate IME taking place, but these are not widely
-  // supported or compatible enough yet to rely on.)
-  function readInput(cm) {
-    var input = cm.display.input, prevInput = cm.display.prevInput, doc = cm.doc, sel = doc.sel;
-    if (!cm.state.focused || hasSelection(input) || isReadOnly(cm) || cm.state.disableInput) return false;
-    if (cm.state.pasteIncoming && cm.state.fakedLastChar) {
-      input.value = input.value.substring(0, input.value.length - 1);
-      cm.state.fakedLastChar = false;
-    }
-    var text = input.value;
-    if (text == prevInput && posEq(sel.from, sel.to)) return false;
-    if (ie && !ie_lt9 && cm.display.inputHasSelection === text) {
-      resetInput(cm, true);
-      return false;
-    }
-
-    var withOp = !cm.curOp;
-    if (withOp) startOperation(cm);
-    sel.shift = false;
-    var same = 0, l = Math.min(prevInput.length, text.length);
-    while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) ++same;
-    var from = sel.from, to = sel.to;
-    if (same < prevInput.length)
-      from = Pos(from.line, from.ch - (prevInput.length - same));
-    else if (cm.state.overwrite && posEq(from, to) && !cm.state.pasteIncoming)
-      to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + (text.length - same)));
-
-    var updateInput = cm.curOp.updateInput;
-    var changeEvent = {from: from, to: to, text: splitLines(text.slice(same)),
-                       origin: cm.state.pasteIncoming ? "paste" : "+input"};
-    makeChange(cm.doc, changeEvent, "end");
-    cm.curOp.updateInput = updateInput;
-    signalLater(cm, "inputRead", cm, changeEvent);
-
-    if (text.length > 1000 || text.indexOf("\n") > -1) input.value = cm.display.prevInput = "";
-    else cm.display.prevInput = text;
-    if (withOp) endOperation(cm);
-    cm.state.pasteIncoming = false;
-    return true;
-  }
-
-  function resetInput(cm, user) {
-    var minimal, selected, doc = cm.doc;
-    if (!posEq(doc.sel.from, doc.sel.to)) {
-      cm.display.prevInput = "";
-      minimal = hasCopyEvent &&
-        (doc.sel.to.line - doc.sel.from.line > 100 || (selected = cm.getSelection()).length > 1000);
-      var content = minimal ? "-" : selected || cm.getSelection();
-      cm.display.input.value = content;
-      if (cm.state.focused) selectInput(cm.display.input);
-      if (ie && !ie_lt9) cm.display.inputHasSelection = content;
-    } else if (user) {
-      cm.display.prevInput = cm.display.input.value = "";
-      if (ie && !ie_lt9) cm.display.inputHasSelection = null;
-    }
-    cm.display.inaccurateSelection = minimal;
-  }
-
-  function focusInput(cm) {
-    if (cm.options.readOnly != "nocursor" && (!mobile || document.activeElement != cm.display.input))
-      cm.display.input.focus();
-  }
-
-  function isReadOnly(cm) {
-    return cm.options.readOnly || cm.doc.cantEdit;
-  }
-
-  // EVENT HANDLERS
-
-  function registerEventHandlers(cm) {
-    var d = cm.display;
-    on(d.scroller, "mousedown", operation(cm, onMouseDown));
-    if (ie)
-      on(d.scroller, "dblclick", operation(cm, function(e) {
-        if (signalDOMEvent(cm, e)) return;
-        var pos = posFromMouse(cm, e);
-        if (!pos || clickInGutter(cm, e) || eventInWidget(cm.display, e)) return;
-        e_preventDefault(e);
-        var word = findWordAt(getLine(cm.doc, pos.line).text, pos);
-        extendSelection(cm.doc, word.from, word.to);
-      }));
-    else
-      on(d.scroller, "dblclick", function(e) { signalDOMEvent(cm, e) || e_preventDefault(e); });
-    on(d.lineSpace, "selectstart", function(e) {
-      if (!eventInWidget(d, e)) e_preventDefault(e);
-    });
-    // Gecko browsers fire contextmenu *after* opening the menu, at
-    // which point we can't mess with it anymore. Context menu is
-    // handled in onMouseDown for Gecko.
-    if (!captureMiddleClick) on(d.scroller, "contextmenu", function(e) {onContextMenu(cm, e);});
-
-    on(d.scroller, "scroll", function() {
-      if (d.scroller.clientHeight) {
-        setScrollTop(cm, d.scroller.scrollTop);
-        setScrollLeft(cm, d.scroller.scrollLeft, true);
-        signal(cm, "scroll", cm);
-      }
-    });
-    on(d.scrollbarV, "scroll", function() {
-      if (d.scroller.clientHeight) setScrollTop(cm, d.scrollbarV.scrollTop);
-    });
-    on(d.scrollbarH, "scroll", function() {
-      if (d.scroller.clientHeight) setScrollLeft(cm, d.scrollbarH.scrollLeft);
-    });
-
-    on(d.scroller, "mousewheel", function(e){onScrollWheel(cm, e);});
-    on(d.scroller, "DOMMouseScroll", function(e){onScrollWheel(cm, e);});
-
-    function reFocus() { if (cm.state.focused) setTimeout(bind(focusInput, cm), 0); }
-    on(d.scrollbarH, "mousedown", reFocus);
-    on(d.scrollbarV, "mousedown", reFocus);
-    // Prevent wrapper from ever scrolling
-    on(d.wrapper, "scroll", function() { d.wrapper.scrollTop = d.wrapper.scrollLeft = 0; });
-
-    var resizeTimer;
-    function onResize() {
-      if (resizeTimer == null) resizeTimer = setTimeout(function() {
-        resizeTimer = null;
-        // Might be a text scaling operation, clear size caches.
-        d.cachedCharWidth = d.cachedTextHeight = knownScrollbarWidth = null;
-        clearCaches(cm);
-        runInOp(cm, bind(regChange, cm));
-      }, 100);
-    }
-    on(window, "resize", onResize);
-    // Above handler holds on to the editor and its data structures.
-    // Here we poll to unregister it when the editor is no longer in
-    // the document, so that it can be garbage-collected.
-    function unregister() {
-      for (var p = d.wrapper.parentNode; p && p != document.body; p = p.parentNode) {}
-      if (p) setTimeout(unregister, 5000);
-      else off(window, "resize", onResize);
-    }
-    setTimeout(unregister, 5000);
-
-    on(d.input, "keyup", operation(cm, function(e) {
-      if (signalDOMEvent(cm, e) || cm.options.onKeyEvent && cm.options.onKeyEvent(cm, addStop(e))) return;
-      if (e.keyCode == 16) cm.doc.sel.shift = false;
-    }));
-    on(d.input, "input", bind(fastPoll, cm));
-    on(d.input, "keydown", operation(cm, onKeyDown));
-    on(d.input, "keypress", operation(cm, onKeyPress));
-    on(d.input, "focus", bind(onFocus, cm));
-    on(d.input, "blur", bind(onBlur, cm));
-
-    function drag_(e) {
-      if (signalDOMEvent(cm, e) || cm.options.onDragEvent && cm.options.onDragEvent(cm, addStop(e))) return;
-      e_stop(e);
-    }
-    if (cm.options.dragDrop) {
-      on(d.scroller, "dragstart", function(e){onDragStart(cm, e);});
-      on(d.scroller, "dragenter", drag_);
-      on(d.scroller, "dragover", drag_);
-      on(d.scroller, "drop", operation(cm, onDrop));
-    }
-    on(d.scroller, "paste", function(e) {
-      if (eventInWidget(d, e)) return;
-      focusInput(cm);
-      fastPoll(cm);
-    });
-    on(d.input, "paste", function() {
-      // Workaround for webkit bug https://bugs.webkit.org/show_bug.cgi?id=90206
-      // Add a char to the end of textarea before paste occur so that
-      // selection doesn't span to the end of textarea.
-      if (webkit && !cm.state.fakedLastChar && !(new Date - cm.state.lastMiddleDown < 200)) {
-        var start = d.input.selectionStart, end = d.input.selectionEnd;
-        d.input.value += "$";
-        d.input.selectionStart = start;
-        d.input.selectionEnd = end;
-        cm.state.fakedLastChar = true;
-      }
-      cm.state.pasteIncoming = true;
-      fastPoll(cm);
-    });
-
-    function prepareCopy() {
-      if (d.inaccurateSelection) {
-        d.prevInput = "";
-        d.inaccurateSelection = false;
-        d.input.value = cm.getSelection();
-        selectInput(d.input);
-      }
-    }
-    on(d.input, "cut", prepareCopy);
-    on(d.input, "copy", prepareCopy);
-
-    // Needed to handle Tab key in KHTML
-    if (khtml) on(d.sizer, "mouseup", function() {
-        if (document.activeElement == d.input) d.input.blur();
-        focusInput(cm);
-    });
-  }
-
-  function eventInWidget(display, e) {
-    for (var n = e_target(e); n != display.wrapper; n = n.parentNode) {
-      if (!n || n.ignoreEvents || n.parentNode == display.sizer && n != display.mover) return true;
-    }
-  }
-
-  function posFromMouse(cm, e, liberal) {
-    var display = cm.display;
-    if (!liberal) {
-      var target = e_target(e);
-      if (target == display.scrollbarH || target == display.scrollbarH.firstChild ||
-          target == display.scrollbarV || target == display.scrollbarV.firstChild ||
-          target == display.scrollbarFiller || target == display.gutterFiller) return null;
-    }
-    var x, y, space = getRect(display.lineSpace);
-    // Fails unpredictably on IE[67] when mouse is dragged around quickly.
-    try { x = e.clientX; y = e.clientY; } catch (e) { return null; }
-    return coordsChar(cm, x - space.left, y - space.top);
-  }
-
-  var lastClick, lastDoubleClick;
-  function onMouseDown(e) {
-    if (signalDOMEvent(this, e)) return;
-    var cm = this, display = cm.display, doc = cm.doc, sel = doc.sel;
-    sel.shift = e.shiftKey;
-
-    if (eventInWidget(display, e)) {
-      if (!webkit) {
-        display.scroller.draggable = false;
-        setTimeout(function(){display.scroller.draggable = true;}, 100);
-      }
-      return;
-    }
-    if (clickInGutter(cm, e)) return;
-    var start = posFromMouse(cm, e);
-
-    switch (e_button(e)) {
-    case 3:
-      if (captureMiddleClick) onContextMenu.call(cm, cm, e);
-      return;
-    case 2:
-      if (webkit) cm.state.lastMiddleDown = +new Date;
-      if (start) extendSelection(cm.doc, start);
-      setTimeout(bind(focusInput, cm), 20);
-      e_preventDefault(e);
-      return;
-    }
-    // For button 1, if it was clicked inside the editor
-    // (posFromMouse returning non-null), we have to adjust the
-    // selection.
-    if (!start) {if (e_target(e) == display.scroller) e_preventDefault(e); return;}
-
-    if (!cm.state.focused) onFocus(cm);
-
-    var now = +new Date, type = "single";
-    if (lastDoubleClick && lastDoubleClick.time > now - 400 && posEq(lastDoubleClick.pos, start)) {
-      type = "triple";
-      e_preventDefault(e);
-      setTimeout(bind(focusInput, cm), 20);
-      selectLine(cm, start.line);
-    } else if (lastClick && lastClick.time > now - 400 && posEq(lastClick.pos, start)) {
-      type = "double";
-      lastDoubleClick = {time: now, pos: start};
-      e_preventDefault(e);
-      var word = findWordAt(getLine(doc, start.line).text, start);
-      extendSelection(cm.doc, word.from, word.to);
-    } else { lastClick = {time: now, pos: start}; }
-
-    var last = start;
-    if (cm.options.dragDrop && dragAndDrop && !isReadOnly(cm) && !posEq(sel.from, sel.to) &&
-        !posLess(start, sel.from) && !posLess(sel.to, start) && type == "single") {
-      var dragEnd = operation(cm, function(e2) {
-        if (webkit) display.scroller.draggable = false;
-        cm.state.draggingText = false;
-        off(document, "mouseup", dragEnd);
-        off(display.scroller, "drop", dragEnd);
-        if (Math.abs(e.clientX - e2.clientX) + Math.abs(e.clientY - e2.clientY) < 10) {
-          e_preventDefault(e2);
-          extendSelection(cm.doc, start);
-          focusInput(cm);
-        }
-      });
-      // Let the drag handler handle this.
-      if (webkit) display.scroller.draggable = true;
-      cm.state.draggingText = dragEnd;
-      // IE's approach to draggable
-      if (display.scroller.dragDrop) display.scroller.dragDrop();
-      on(document, "mouseup", dragEnd);
-      on(display.scroller, "drop", dragEnd);
-      return;
-    }
-    e_preventDefault(e);
-    if (type == "single") extendSelection(cm.doc, clipPos(doc, start));
-
-    var startstart = sel.from, startend = sel.to, lastPos = start;
-
-    function doSelect(cur) {
-      if (posEq(lastPos, cur)) return;
-      lastPos = cur;
-
-      if (type == "single") {
-        extendSelection(cm.doc, clipPos(doc, start), cur);
-        return;
-      }
-
-      startstart = clipPos(doc, startstart);
-      startend = clipPos(doc, startend);
-      if (type == "double") {
-        var word = findWordAt(getLine(doc, cur.line).text, cur);
-        if (posLess(cur, startstart)) extendSelection(cm.doc, word.from, startend);
-        else extendSelection(cm.doc, startstart, word.to);
-      } else if (type == "triple") {
-        if (posLess(cur, startstart)) extendSelection(cm.doc, startend, clipPos(doc, Pos(cur.line, 0)));
-        else extendSelection(cm.doc, startstart, clipPos(doc, Pos(cur.line + 1, 0)));
-      }
-    }
-
-    var editorSize = getRect(display.wrapper);
-    // Used to ensure timeout re-tries don't fire when another extend
-    // happened in the meantime (clearTimeout isn't reliable -- at
-    // least on Chrome, the timeouts still happen even when cleared,
-    // if the clear happens after their scheduled firing time).
-    var counter = 0;
-
-    function extend(e) {
-      var curCount = ++counter;
-      var cur = posFromMouse(cm, e, true);
-      if (!cur) return;
-      if (!posEq(cur, last)) {
-        if (!cm.state.focused) onFocus(cm);
-        last = cur;
-        doSelect(cur);
-        var visible = visibleLines(display, doc);
-        if (cur.line >= visible.to || cur.line < visible.from)
-          setTimeout(operation(cm, function(){if (counter == curCount) extend(e);}), 150);
-      } else {
-        var outside = e.clientY < editorSize.top ? -20 : e.clientY > editorSize.bottom ? 20 : 0;
-        if (outside) setTimeout(operation(cm, function() {
-          if (counter != curCount) return;
-          display.scroller.scrollTop += outside;
-          extend(e);
-        }), 50);
-      }
-    }
-
-    function done(e) {
-      counter = Infinity;
-      e_preventDefault(e);
-      focusInput(cm);
-      off(document, "mousemove", move);
-      off(document, "mouseup", up);
-    }
-
-    var move = operation(cm, function(e) {
-      if (!ie && !e_button(e)) done(e);
-      else extend(e);
-    });
-    var up = operation(cm, done);
-    on(document, "mousemove", move);
-    on(document, "mouseup", up);
-  }
-
-  function clickInGutter(cm, e) {
-    var display = cm.display;
-    try { var mX = e.clientX, mY = e.clientY; }
-    catch(e) { return false; }
-
-    if (mX >= Math.floor(getRect(display.gutters).right)) return false;
-    e_preventDefault(e);
-    if (!hasHandler(cm, "gutterClick")) return true;
-
-    var lineBox = getRect(display.lineDiv);
-    if (mY > lineBox.bottom) return true;
-    mY -= lineBox.top - display.viewOffset;
-
-    for (var i = 0; i < cm.options.gutters.length; ++i) {
-      var g = display.gutters.childNodes[i];
-      if (g && getRect(g).right >= mX) {
-        var line = lineAtHeight(cm.doc, mY);
-        var gutter = cm.options.gutters[i];
-        signalLater(cm, "gutterClick", cm, line, gutter, e);
-        break;
-      }
-    }
-    return true;
-  }
-
-  // Kludge to work around strange IE behavior where it'll sometimes
-  // re-fire a series of drag-related events right after the drop (#1551)
-  var lastDrop = 0;
-
-  function onDrop(e) {
-    var cm = this;
-    if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e) || (cm.options.onDragEvent && cm.options.onDragEvent(cm, addStop(e))))
-      return;
-    e_preventDefault(e);
-    if (ie) lastDrop = +new Date;
-    var pos = posFromMouse(cm, e, true), files = e.dataTransfer.files;
-    if (!pos || isReadOnly(cm)) return;
-    if (files && files.length && window.FileReader && window.File) {
-      var n = files.length, text = Array(n), read = 0;
-      var loadFile = function(file, i) {
-        var reader = new FileReader;
-        reader.onload = function() {
-          text[i] = reader.result;
-          if (++read == n) {
-            pos = clipPos(cm.doc, pos);
-            makeChange(cm.doc, {from: pos, to: pos, text: splitLines(text.join("\n")), origin: "paste"}, "around");
-          }
-        };
-        reader.readAsText(file);
-      };
-      for (var i = 0; i < n; ++i) loadFile(files[i], i);
-    } else {
-      // Don't do a replace if the drop happened inside of the selected text.
-      if (cm.state.draggingText && !(posLess(pos, cm.doc.sel.from) || posLess(cm.doc.sel.to, pos))) {
-        cm.state.draggingText(e);
-        // Ensure the editor is re-focused
-        setTimeout(bind(focusInput, cm), 20);
-        return;
-      }
-      try {
-        var text = e.dataTransfer.getData("Text");
-        if (text) {
-          var curFrom = cm.doc.sel.from, curTo = cm.doc.sel.to;
-          setSelection(cm.doc, pos, pos);
-          if (cm.state.draggingText) replaceRange(cm.doc, "", curFrom, curTo, "paste");
-          cm.replaceSelection(text, null, "paste");
-          focusInput(cm);
-          onFocus(cm);
-        }
-      }
-      catch(e){}
-    }
-  }
-
-  function onDragStart(cm, e) {
-    if (ie && (!cm.state.draggingText || +new Date - lastDrop < 100)) { e_stop(e); return; }
-    if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) return;
-
-    var txt = cm.getSelection();
-    e.dataTransfer.setData("Text", txt);
-
-    // Use dummy image instead of default browsers image.
-    // Recent Safari (~6.0.2) have a tendency to segfault when this happens, so we don't do it there.
-    if (e.dataTransfer.setDragImage && !safari) {
-      var img = elt("img", null, null, "position: fixed; left: 0; top: 0;");
-      if (opera) {
-        img.width = img.height = 1;
-        cm.display.wrapper.appendChild(img);
-        // Force a relayout, or Opera won't use our image for some obscure reason
-        img._top = img.offsetTop;
-      }
-      e.dataTransfer.setDragImage(img, 0, 0);
-      if (opera) img.parentNode.removeChild(img);
-    }
-  }
-
-  function setScrollTop(cm, val) {
-    if (Math.abs(cm.doc.scrollTop - val) < 2) return;
-    cm.doc.scrollTop = val;
-    if (!gecko) updateDisplay(cm, [], val);
-    if (cm.display.scroller.scrollTop != val) cm.display.scroller.scrollTop = val;
-    if (cm.display.scrollbarV.scrollTop != val) cm.display.scrollbarV.scrollTop = val;
-    if (gecko) updateDisplay(cm, []);
-    startWorker(cm, 100);
-  }
-  function setScrollLeft(cm, val, isScroller) {
-    if (isScroller ? val == cm.doc.scrollLeft : Math.abs(cm.doc.scrollLeft - val) < 2) return;
-    val = Math.min(val, cm.display.scroller.scrollWidth - cm.display.scroller.clientWidth);
-    cm.doc.scrollLeft = val;
-    alignHorizontally(cm);
-    if (cm.display.scroller.scrollLeft != val) cm.display.scroller.scrollLeft = val;
-    if (cm.display.scrollbarH.scrollLeft != val) cm.display.scrollbarH.scrollLeft = val;
-  }
-
-  // Since the delta values reported on mouse wheel events are
-  // unstandardized between browsers and even browser versions, and
-  // generally horribly unpredictable, this code starts by measuring
-  // the scroll effect that the first few mouse wheel events have,
-  // and, from that, detects the way it can convert deltas to pixel
-  // offsets afterwards.
-  //
-  // The reason we want to know the amount a wheel event will scroll
-  // is that it gives us a chance to update the display before the
-  // actual scrolling happens, reducing flickering.
-
-  var wheelSamples = 0, wheelPixelsPerUnit = null;
-  // Fill in a browser-detected starting value on browsers where we
-  // know one. These don't have to be accurate -- the result of them
-  // being wrong would just be a slight flicker on the first wheel
-  // scroll (if it is large enough).
-  if (ie) wheelPixelsPerUnit = -.53;
-  else if (gecko) wheelPixelsPerUnit = 15;
-  else if (chrome) wheelPixelsPerUnit = -.7;
-  else if (safari) wheelPixelsPerUnit = -1/3;
-
-  function onScrollWheel(cm, e) {
-    var dx = e.wheelDeltaX, dy = e.wheelDeltaY;
-    if (dx == null && e.detail && e.axis == e.HORIZONTAL_AXIS) dx = e.detail;
-    if (dy == null && e.detail && e.axis == e.VERTICAL_AXIS) dy = e.detail;
-    else if (dy == null) dy = e.wheelDelta;
-
-    var display = cm.display, scroll = display.scroller;
-    // Quit if there's nothing to scroll here
-    if (!(dx && scroll.scrollWidth > scroll.clientWidth ||
-          dy && scroll.scrollHeight > scroll.clientHeight)) return;
-
-    // Webkit browsers on OS X abort momentum scrolls when the target
-    // of the scroll event is removed from the scrollable element.
-    // This hack (see related code in patchDisplay) makes sure the
-    // element is kept around.
-    if (dy && mac && webkit) {
-      for (var cur = e.target; cur != scroll; cur = cur.parentNode) {
-        if (cur.lineObj) {
-          cm.display.currentWheelTarget = cur;
-          break;
-        }
-      }
-    }
-
-    // On some browsers, horizontal scrolling will cause redraws to
-    // happen before the gutter has been realigned, causing it to
-    // wriggle around in a most unseemly way. When we have an
-    // estimated pixels/delta value, we just handle horizontal
-    // scrolling entirely here. It'll be slightly off from native, but
-    // better than glitching out.
-    if (dx && !gecko && !opera && wheelPixelsPerUnit != null) {
-      if (dy)
-        setScrollTop(cm, Math.max(0, Math.min(scroll.scrollTop + dy * wheelPixelsPerUnit, scroll.scrollHeight - scroll.clientHeight)));
-      setScrollLeft(cm, Math.max(0, Math.min(scroll.scrollLeft + dx * wheelPixelsPerUnit, scroll.scrollWidth - scroll.clientWidth)));
-      e_preventDefault(e);
-      display.wheelStartX = null; // Abort measurement, if in progress
-      return;
-    }
-
-    if (dy && wheelPixelsPerUnit != null) {
-      var pixels = dy * wheelPixelsPerUnit;
-      var top = cm.doc.scrollTop, bot = top + display.wrapper.clientHeight;
-      if (pixels < 0) top = Math.max(0, top + pixels - 50);
-      else bot = Math.min(cm.doc.height, bot + pixels + 50);
-      updateDisplay(cm, [], {top: top, bottom: bot});
-    }
-
-    if (wheelSamples < 20) {
-      if (display.wheelStartX == null) {
-        display.wheelStartX = scroll.scrollLeft; display.wheelStartY = scroll.scrollTop;
-        display.wheelDX = dx; display.wheelDY = dy;
-        setTimeout(function() {
-          if (display.wheelStartX == null) return;
-          var movedX = scroll.scrollLeft - display.wheelStartX;
-          var movedY = scroll.scrollTop - display.wheelStartY;
-          var sample = (movedY && display.wheelDY && movedY / display.wheelDY) ||
-            (movedX && display.wheelDX && movedX / display.wheelDX);
-          display.wheelStartX = display.wheelStartY = null;
-          if (!sample) return;
-          wheelPixelsPerUnit = (wheelPixelsPerUnit * wheelSamples + sample) / (wheelSamples + 1);
-          ++wheelSamples;
-        }, 200);
-      } else {
-        display.wheelDX += dx; display.wheelDY += dy;
-      }
-    }
-  }
-
-  function doHandleBinding(cm, bound, dropShift) {
-    if (typeof bound == "string") {
-      bound = commands[bound];
-      if (!bound) return false;
-    }
-    // Ensure previous input has been read, so that the handler sees a
-    // consistent view of the document
-    if (cm.display.pollingFast && readInput(cm)) cm.display.pollingFast = false;
-    var doc = cm.doc, prevShift = doc.sel.shift, done = false;
-    try {
-      if (isReadOnly(cm)) cm.state.suppressEdits = true;
-      if (dropShift) doc.sel.shift = false;
-      done = bound(cm) != Pass;
-    } finally {
-      doc.sel.shift = prevShift;
-      cm.state.suppressEdits = false;
-    }
-    return done;
-  }
-
-  function allKeyMaps(cm) {
-    var maps = cm.state.keyMaps.slice(0);
-    if (cm.options.extraKeys) maps.push(cm.options.extraKeys);
-    maps.push(cm.options.keyMap);
-    return maps;
-  }
-
-  var maybeTransition;
-  function handleKeyBinding(cm, e) {
-    // Handle auto keymap transitions
-    var startMap = getKeyMap(cm.options.keyMap), next = startMap.auto;
-    clearTimeout(maybeTransition);
-    if (next && !isModifierKey(e)) maybeTransition = setTimeout(function() {
-      if (getKeyMap(cm.options.keyMap) == startMap) {
-        cm.options.keyMap = (next.call ? next.call(null, cm) : next);
-        keyMapChanged(cm);
-      }
-    }, 50);
-
-    var name = keyName(e, true), handled = false;
-    if (!name) return false;
-    var keymaps = allKeyMaps(cm);
-
-    if (e.shiftKey) {
-      // First try to resolve full name (including 'Shift-'). Failing
-      // that, see if there is a cursor-motion command (starting with
-      // 'go') bound to the keyname without 'Shift-'.
-      handled = lookupKey("Shift-" + name, keymaps, function(b) {return doHandleBinding(cm, b, true);})
-             || lookupKey(name, keymaps, function(b) {
-                  if (typeof b == "string" ? /^go[A-Z]/.test(b) : b.motion)
-                    return doHandleBinding(cm, b);
-                });
-    } else {
-      handled = lookupKey(name, keymaps, function(b) { return doHandleBinding(cm, b); });
-    }
-
-    if (handled) {
-      e_preventDefault(e);
-      restartBlink(cm);
-      if (ie_lt9) { e.oldKeyCode = e.keyCode; e.keyCode = 0; }
-      signalLater(cm, "keyHandled", cm, name, e);
-    }
-    return handled;
-  }
-
-  function handleCharBinding(cm, e, ch) {
-    var handled = lookupKey("'" + ch + "'", allKeyMaps(cm),
-                            function(b) { return doHandleBinding(cm, b, true); });
-    if (handled) {
-      e_preventDefault(e);
-      restartBlink(cm);
-      signalLater(cm, "keyHandled", cm, "'" + ch + "'", e);
-    }
-    return handled;
-  }
-
-  var lastStoppedKey = null;
-  function onKeyDown(e) {
-    var cm = this;
-    if (!cm.state.focused) onFocus(cm);
-    if (signalDOMEvent(cm, e) || cm.options.onKeyEvent && cm.options.onKeyEvent(cm, addStop(e))) return;
-    if (ie && e.keyCode == 27) e.returnValue = false;
-    var code = e.keyCode;
-    // IE does strange things with escape.
-    cm.doc.sel.shift = code == 16 || e.shiftKey;
-    // First give onKeyEvent option a chance to handle this.
-    var handled = handleKeyBinding(cm, e);
-    if (opera) {
-      lastStoppedKey = handled ? code : null;
-      // Opera has no cut event... we try to at least catch the key combo
-      if (!handled && code == 88 && !hasCopyEvent && (mac ? e.metaKey : e.ctrlKey))
-        cm.replaceSelection("");
-    }
-  }
-
-  function onKeyPress(e) {
-    var cm = this;
-    if (signalDOMEvent(cm, e) || cm.options.onKeyEvent && cm.options.onKeyEvent(cm, addStop(e))) return;
-    var keyCode = e.keyCode, charCode = e.charCode;
-    if (opera && keyCode == lastStoppedKey) {lastStoppedKey = null; e_preventDefault(e); return;}
-    if (((opera && (!e.which || e.which < 10)) || khtml) && handleKeyBinding(cm, e)) return;
-    var ch = String.fromCharCode(charCode == null ? keyCode : charCode);
-    if (this.options.electricChars && this.doc.mode.electricChars &&
-        this.options.smartIndent && !isReadOnly(this) &&
-        this.doc.mode.electricChars.indexOf(ch) > -1)
-      setTimeout(operation(cm, function() {indentLine(cm, cm.doc.sel.to.line, "smart");}), 75);
-    if (handleCharBinding(cm, e, ch)) return;
-    if (ie && !ie_lt9) cm.display.inputHasSelection = null;
-    fastPoll(cm);
-  }
-
-  function onFocus(cm) {
-    if (cm.options.readOnly == "nocursor") return;
-    if (!cm.state.focused) {
-      signal(cm, "focus", cm);
-      cm.state.focused = true;
-      if (cm.display.wrapper.className.search(/\bCodeMirror-focused\b/) == -1)
-        cm.display.wrapper.className += " CodeMirror-focused";
-      if (!cm.curOp) {
-        resetInput(cm, true);
-        if (webkit) setTimeout(bind(resetInput, cm, true), 0); // Issue #1730
-      }
-    }
-    slowPoll(cm);
-    restartBlink(cm);
-  }
-  function onBlur(cm) {
-    if (cm.state.focused) {
-      signal(cm, "blur", cm);
-      cm.state.focused = false;
-      cm.display.wrapper.className = cm.display.wrapper.className.replace(" CodeMirror-focused", "");
-    }
-    clearInterval(cm.display.blinker);
-    setTimeout(function() {if (!cm.state.focused) cm.doc.sel.shift = false;}, 150);
-  }
-
-  var detectingSelectAll;
-  function onContextMenu(cm, e) {
-    if (signalDOMEvent(cm, e, "contextmenu")) return;
-    var display = cm.display, sel = cm.doc.sel;
-    if (eventInWidget(display, e)) return;
-
-    var pos = posFromMouse(cm, e), scrollPos = display.scroller.scrollTop;
-    if (!pos || opera) return; // Opera is difficult.
-    if (posEq(sel.from, sel.to) || posLess(pos, sel.from) || !posLess(pos, sel.to))
-      operation(cm, setSelection)(cm.doc, pos, pos);
-
-    var oldCSS = display.input.style.cssText;
-    display.inputDiv.style.position = "absolute";
-    display.input.style.cssText = "position: fixed; width: 30px; height: 30px; top: " + (e.clientY - 5) +
-      "px; left: " + (e.clientX - 5) + "px; z-index: 1000; background: white; outline: none;" +
-      "border-width: 0; outline: none; overflow: hidden; opacity: .05; -ms-opacity: .05; filter: alpha(opacity=5);";
-    focusInput(cm);
-    resetInput(cm, true);
-    // Adds "Select all" to context menu in FF
-    if (posEq(sel.from, sel.to)) display.input.value = display.prevInput = " ";
-
-    function prepareSelectAllHack() {
-      if (display.input.selectionStart != null) {
-        var extval = display.input.value = " " + (posEq(sel.from, sel.to) ? "" : display.input.value);
-        display.prevInput = " ";
-        display.input.selectionStart = 1; display.input.selectionEnd = extval.length;
-      }
-    }
-    function rehide() {
-      display.inputDiv.style.position = "relative";
-      display.input.style.cssText = oldCSS;
-      if (ie_lt9) display.scrollbarV.scrollTop = display.scroller.scrollTop = scrollPos;
-      slowPoll(cm);
-
-      // Try to detect the user choosing select-all
-      if (display.input.selectionStart != null) {
-        if (!ie || ie_lt9) prepareSelectAllHack();
-        clearTimeout(detectingSelectAll);
-        var i = 0, poll = function(){
-          if (display.prevInput == " " && display.input.selectionStart == 0)
-            operation(cm, commands.selectAll)(cm);
-          else if (i++ < 10) detectingSelectAll = setTimeout(poll, 500);
-          else resetInput(cm);
-        };
-        detectingSelectAll = setTimeout(poll, 200);
-      }
-    }
-
-    if (ie && !ie_lt9) prepareSelectAllHack();
-    if (captureMiddleClick) {
-      e_stop(e);
-      var mouseup = function() {
-        off(window, "mouseup", mouseup);
-        setTimeout(rehide, 20);
-      };
-      on(window, "mouseup", mouseup);
-    } else {
-      setTimeout(rehide, 50);
-    }
-  }
-
-  // UPDATING
-
-  var changeEnd = CodeMirror.changeEnd = function(change) {
-    if (!change.text) return change.to;
-    return Pos(change.from.line + change.text.length - 1,
-               lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0));
+    }, lineClasses)
   };
 
-  // Make sure a position will be valid after the given change.
-  function clipPostChange(doc, change, pos) {
-    if (!posLess(change.from, pos)) return clipPos(doc, pos);
-    var diff = (change.text.length - 1) - (change.to.line - change.from.line);
-    if (pos.line > change.to.line + diff) {
-      var preLine = pos.line - diff, lastLine = doc.first + doc.size - 1;
-      if (preLine > lastLine) return Pos(lastLine, getLine(doc, lastLine).text.length);
-      return clipToLen(pos, getLine(doc, preLine).text.length);
-    }
-    if (pos.line == change.to.line + diff)
-      return clipToLen(pos, lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0) +
-                       getLine(doc, change.to.line).text.length - change.to.ch);
-    var inside = pos.line - change.from.line;
-    return clipToLen(pos, change.text[inside].length + (inside ? 0 : change.from.ch));
+  for (var o = 0; o < cm.state.overlays.length; ++o) loop( o );
+
+  return {styles: st, classes: lineClasses.bgClass || lineClasses.textClass ? lineClasses : null}
+}
+
+function getLineStyles(cm, line, updateFrontier) {
+  if (!line.styles || line.styles[0] != cm.state.modeGen) {
+    var state = getStateBefore(cm, lineNo(line))
+    var result = highlightLine(cm, line, line.text.length > cm.options.maxHighlightLength ? copyState(cm.doc.mode, state) : state)
+    line.stateAfter = state
+    line.styles = result.styles
+    if (result.classes) { line.styleClasses = result.classes }
+    else if (line.styleClasses) { line.styleClasses = null }
+    if (updateFrontier === cm.doc.frontier) { cm.doc.frontier++ }
   }
+  return line.styles
+}
 
-  // Hint can be null|"end"|"start"|"around"|{anchor,head}
-  function computeSelAfterChange(doc, change, hint) {
-    if (hint && typeof hint == "object") // Assumed to be {anchor, head} object
-      return {anchor: clipPostChange(doc, change, hint.anchor),
-              head: clipPostChange(doc, change, hint.head)};
+function getStateBefore(cm, n, precise) {
+  var doc = cm.doc, display = cm.display
+  if (!doc.mode.startState) { return true }
+  var pos = findStartLine(cm, n, precise), state = pos > doc.first && getLine(doc, pos-1).stateAfter
+  if (!state) { state = startState(doc.mode) }
+  else { state = copyState(doc.mode, state) }
+  doc.iter(pos, n, function (line) {
+    processLine(cm, line.text, state)
+    var save = pos == n - 1 || pos % 5 == 0 || pos >= display.viewFrom && pos < display.viewTo
+    line.stateAfter = save ? copyState(doc.mode, state) : null
+    ++pos
+  })
+  if (precise) { doc.frontier = pos }
+  return state
+}
 
-    if (hint == "start") return {anchor: change.from, head: change.from};
-
-    var end = changeEnd(change);
-    if (hint == "around") return {anchor: change.from, head: end};
-    if (hint == "end") return {anchor: end, head: end};
-
-    // hint is null, leave the selection alone as much as possible
-    var adjustPos = function(pos) {
-      if (posLess(pos, change.from)) return pos;
-      if (!posLess(change.to, pos)) return end;
-
-      var line = pos.line + change.text.length - (change.to.line - change.from.line) - 1, ch = pos.ch;
-      if (pos.line == change.to.line) ch += end.ch - change.to.ch;
-      return Pos(line, ch);
-    };
-    return {anchor: adjustPos(doc.sel.anchor), head: adjustPos(doc.sel.head)};
+// Lightweight form of highlight -- proceed over this line and
+// update state, but don't save a style array. Used for lines that
+// aren't currently visible.
+function processLine(cm, text, state, startAt) {
+  var mode = cm.doc.mode
+  var stream = new StringStream(text, cm.options.tabSize)
+  stream.start = stream.pos = startAt || 0
+  if (text == "") { callBlankLine(mode, state) }
+  while (!stream.eol()) {
+    readToken(mode, stream, state)
+    stream.start = stream.pos
   }
+}
 
-  function filterChange(doc, change, update) {
-    var obj = {
-      canceled: false,
-      from: change.from,
-      to: change.to,
-      text: change.text,
-      origin: change.origin,
-      cancel: function() { this.canceled = true; }
-    };
-    if (update) obj.update = function(from, to, text, origin) {
-      if (from) this.from = clipPos(doc, from);
-      if (to) this.to = clipPos(doc, to);
-      if (text) this.text = text;
-      if (origin !== undefined) this.origin = origin;
-    };
-    signal(doc, "beforeChange", doc, obj);
-    if (doc.cm) signal(doc.cm, "beforeChange", doc.cm, obj);
+function callBlankLine(mode, state) {
+  if (mode.blankLine) { return mode.blankLine(state) }
+  if (!mode.innerMode) { return }
+  var inner = innerMode(mode, state)
+  if (inner.mode.blankLine) { return inner.mode.blankLine(inner.state) }
+}
 
-    if (obj.canceled) return null;
-    return {from: obj.from, to: obj.to, text: obj.text, origin: obj.origin};
+function readToken(mode, stream, state, inner) {
+  for (var i = 0; i < 10; i++) {
+    if (inner) { inner[0] = innerMode(mode, state).mode }
+    var style = mode.token(stream, state)
+    if (stream.pos > stream.start) { return style }
   }
+  throw new Error("Mode " + mode.name + " failed to advance stream.")
+}
 
-  // Replace the range from from to to by the strings in replacement.
-  // change is a {from, to, text [, origin]} object
-  function makeChange(doc, change, selUpdate, ignoreReadOnly) {
-    if (doc.cm) {
-      if (!doc.cm.curOp) return operation(doc.cm, makeChange)(doc, change, selUpdate, ignoreReadOnly);
-      if (doc.cm.state.suppressEdits) return;
-    }
+// Utility for getTokenAt and getLineTokens
+function takeToken(cm, pos, precise, asArray) {
+  var getObj = function (copy) { return ({
+    start: stream.start, end: stream.pos,
+    string: stream.current(),
+    type: style || null,
+    state: copy ? copyState(doc.mode, state) : state
+  }); }
 
-    if (hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")) {
-      change = filterChange(doc, change, true);
-      if (!change) return;
-    }
+  var doc = cm.doc, mode = doc.mode, style
+  pos = clipPos(doc, pos)
+  var line = getLine(doc, pos.line), state = getStateBefore(cm, pos.line, precise)
+  var stream = new StringStream(line.text, cm.options.tabSize), tokens
+  if (asArray) { tokens = [] }
+  while ((asArray || stream.pos < pos.ch) && !stream.eol()) {
+    stream.start = stream.pos
+    style = readToken(mode, stream, state)
+    if (asArray) { tokens.push(getObj(true)) }
+  }
+  return asArray ? tokens : getObj()
+}
 
-    // Possibly split or suppress the update based on the presence
-    // of read-only spans in its range.
-    var split = sawReadOnlySpans && !ignoreReadOnly && removeReadOnlyRanges(doc, change.from, change.to);
-    if (split) {
-      for (var i = split.length - 1; i >= 1; --i)
-        makeChangeNoReadonly(doc, {from: split[i].from, to: split[i].to, text: [""]});
-      if (split.length)
-        makeChangeNoReadonly(doc, {from: split[0].from, to: split[0].to, text: change.text}, selUpdate);
+function extractLineClasses(type, output) {
+  if (type) { for (;;) {
+    var lineClass = type.match(/(?:^|\s+)line-(background-)?(\S+)/)
+    if (!lineClass) { break }
+    type = type.slice(0, lineClass.index) + type.slice(lineClass.index + lineClass[0].length)
+    var prop = lineClass[1] ? "bgClass" : "textClass"
+    if (output[prop] == null)
+      { output[prop] = lineClass[2] }
+    else if (!(new RegExp("(?:^|\s)" + lineClass[2] + "(?:$|\s)")).test(output[prop]))
+      { output[prop] += " " + lineClass[2] }
+  } }
+  return type
+}
+
+// Run the given mode's parser over a line, calling f for each token.
+function runMode(cm, text, mode, state, f, lineClasses, forceToEnd) {
+  var flattenSpans = mode.flattenSpans
+  if (flattenSpans == null) { flattenSpans = cm.options.flattenSpans }
+  var curStart = 0, curStyle = null
+  var stream = new StringStream(text, cm.options.tabSize), style
+  var inner = cm.options.addModeClass && [null]
+  if (text == "") { extractLineClasses(callBlankLine(mode, state), lineClasses) }
+  while (!stream.eol()) {
+    if (stream.pos > cm.options.maxHighlightLength) {
+      flattenSpans = false
+      if (forceToEnd) { processLine(cm, text, state, stream.pos) }
+      stream.pos = text.length
+      style = null
     } else {
-      makeChangeNoReadonly(doc, change, selUpdate);
+      style = extractLineClasses(readToken(mode, stream, state, inner), lineClasses)
+    }
+    if (inner) {
+      var mName = inner[0].name
+      if (mName) { style = "m-" + (style ? mName + " " + style : mName) }
+    }
+    if (!flattenSpans || curStyle != style) {
+      while (curStart < stream.start) {
+        curStart = Math.min(stream.start, curStart + 5000)
+        f(curStart, curStyle)
+      }
+      curStyle = style
+    }
+    stream.start = stream.pos
+  }
+  while (curStart < stream.pos) {
+    // Webkit seems to refuse to render text nodes longer than 57444
+    // characters, and returns inaccurate measurements in nodes
+    // starting around 5000 chars.
+    var pos = Math.min(stream.pos, curStart + 5000)
+    f(pos, curStyle)
+    curStart = pos
+  }
+}
+
+// Finds the line to start with when starting a parse. Tries to
+// find a line with a stateAfter, so that it can start with a
+// valid state. If that fails, it returns the line with the
+// smallest indentation, which tends to need the least context to
+// parse correctly.
+function findStartLine(cm, n, precise) {
+  var minindent, minline, doc = cm.doc
+  var lim = precise ? -1 : n - (cm.doc.mode.innerMode ? 1000 : 100)
+  for (var search = n; search > lim; --search) {
+    if (search <= doc.first) { return doc.first }
+    var line = getLine(doc, search - 1)
+    if (line.stateAfter && (!precise || search <= doc.frontier)) { return search }
+    var indented = countColumn(line.text, null, cm.options.tabSize)
+    if (minline == null || minindent > indented) {
+      minline = search - 1
+      minindent = indented
+    }
+  }
+  return minline
+}
+
+// LINE DATA STRUCTURE
+
+// Line objects. These hold state related to a line, including
+// highlighting info (the styles array).
+var Line = function(text, markedSpans, estimateHeight) {
+  this.text = text
+  attachMarkedSpans(this, markedSpans)
+  this.height = estimateHeight ? estimateHeight(this) : 1
+};
+
+Line.prototype.lineNo = function () { return lineNo(this) };
+eventMixin(Line)
+
+// Change the content (text, markers) of a line. Automatically
+// invalidates cached information and tries to re-estimate the
+// line's height.
+function updateLine(line, text, markedSpans, estimateHeight) {
+  line.text = text
+  if (line.stateAfter) { line.stateAfter = null }
+  if (line.styles) { line.styles = null }
+  if (line.order != null) { line.order = null }
+  detachMarkedSpans(line)
+  attachMarkedSpans(line, markedSpans)
+  var estHeight = estimateHeight ? estimateHeight(line) : 1
+  if (estHeight != line.height) { updateLineHeight(line, estHeight) }
+}
+
+// Detach a line from the document tree and its markers.
+function cleanUpLine(line) {
+  line.parent = null
+  detachMarkedSpans(line)
+}
+
+// Convert a style as returned by a mode (either null, or a string
+// containing one or more styles) to a CSS style. This is cached,
+// and also looks for line-wide styles.
+var styleToClassCache = {};
+var styleToClassCacheWithMode = {};
+function interpretTokenStyle(style, options) {
+  if (!style || /^\s*$/.test(style)) { return null }
+  var cache = options.addModeClass ? styleToClassCacheWithMode : styleToClassCache
+  return cache[style] ||
+    (cache[style] = style.replace(/\S+/g, "cm-$&"))
+}
+
+// Render the DOM representation of the text of a line. Also builds
+// up a 'line map', which points at the DOM nodes that represent
+// specific stretches of text, and is used by the measuring code.
+// The returned object contains the DOM node, this map, and
+// information about line-wide styles that were set by the mode.
+function buildLineContent(cm, lineView) {
+  // The padding-right forces the element to have a 'border', which
+  // is needed on Webkit to be able to get line-level bounding
+  // rectangles for it (in measureChar).
+  var content = eltP("span", null, null, webkit ? "padding-right: .1px" : null)
+  var builder = {pre: eltP("pre", [content], "CodeMirror-line"), content: content,
+                 col: 0, pos: 0, cm: cm,
+                 trailingSpace: false,
+                 splitSpaces: (ie || webkit) && cm.getOption("lineWrapping")}
+  lineView.measure = {}
+
+  // Iterate over the logical lines that make up this visual line.
+  for (var i = 0; i <= (lineView.rest ? lineView.rest.length : 0); i++) {
+    var line = i ? lineView.rest[i - 1] : lineView.line, order = (void 0)
+    builder.pos = 0
+    builder.addToken = buildToken
+    // Optionally wire in some hacks into the token-rendering
+    // algorithm, to deal with browser quirks.
+    if (hasBadBidiRects(cm.display.measure) && (order = getOrder(line, cm.doc.direction)))
+      { builder.addToken = buildTokenBadBidi(builder.addToken, order) }
+    builder.map = []
+    var allowFrontierUpdate = lineView != cm.display.externalMeasured && lineNo(line)
+    insertLineContent(line, builder, getLineStyles(cm, line, allowFrontierUpdate))
+    if (line.styleClasses) {
+      if (line.styleClasses.bgClass)
+        { builder.bgClass = joinClasses(line.styleClasses.bgClass, builder.bgClass || "") }
+      if (line.styleClasses.textClass)
+        { builder.textClass = joinClasses(line.styleClasses.textClass, builder.textClass || "") }
+    }
+
+    // Ensure at least a single node is present, for measuring.
+    if (builder.map.length == 0)
+      { builder.map.push(0, 0, builder.content.appendChild(zeroWidthElement(cm.display.measure))) }
+
+    // Store the map and a cache object for the current logical line
+    if (i == 0) {
+      lineView.measure.map = builder.map
+      lineView.measure.cache = {}
+    } else {
+      ;(lineView.measure.maps || (lineView.measure.maps = [])).push(builder.map)
+      ;(lineView.measure.caches || (lineView.measure.caches = [])).push({})
     }
   }
 
-  function makeChangeNoReadonly(doc, change, selUpdate) {
-    var selAfter = computeSelAfterChange(doc, change, selUpdate);
-    addToHistory(doc, change, selAfter, doc.cm ? doc.cm.curOp.id : NaN);
+  // See issue #2901
+  if (webkit) {
+    var last = builder.content.lastChild
+    if (/\bcm-tab\b/.test(last.className) || (last.querySelector && last.querySelector(".cm-tab")))
+      { builder.content.className = "cm-tab-wrap-hack" }
+  }
 
-    makeChangeSingleDoc(doc, change, selAfter, stretchSpansOverChange(doc, change));
-    var rebased = [];
+  signal(cm, "renderLine", cm, lineView.line, builder.pre)
+  if (builder.pre.className)
+    { builder.textClass = joinClasses(builder.pre.className, builder.textClass || "") }
 
-    linkedDocs(doc, function(doc, sharedHist) {
+  return builder
+}
+
+function defaultSpecialCharPlaceholder(ch) {
+  var token = elt("span", "\u2022", "cm-invalidchar")
+  token.title = "\\u" + ch.charCodeAt(0).toString(16)
+  token.setAttribute("aria-label", token.title)
+  return token
+}
+
+// Build up the DOM representation for a single token, and add it to
+// the line map. Takes care to render special characters separately.
+function buildToken(builder, text, style, startStyle, endStyle, title, css) {
+  if (!text) { return }
+  var displayText = builder.splitSpaces ? splitSpaces(text, builder.trailingSpace) : text
+  var special = builder.cm.state.specialChars, mustWrap = false
+  var content
+  if (!special.test(text)) {
+    builder.col += text.length
+    content = document.createTextNode(displayText)
+    builder.map.push(builder.pos, builder.pos + text.length, content)
+    if (ie && ie_version < 9) { mustWrap = true }
+    builder.pos += text.length
+  } else {
+    content = document.createDocumentFragment()
+    var pos = 0
+    while (true) {
+      special.lastIndex = pos
+      var m = special.exec(text)
+      var skipped = m ? m.index - pos : text.length - pos
+      if (skipped) {
+        var txt = document.createTextNode(displayText.slice(pos, pos + skipped))
+        if (ie && ie_version < 9) { content.appendChild(elt("span", [txt])) }
+        else { content.appendChild(txt) }
+        builder.map.push(builder.pos, builder.pos + skipped, txt)
+        builder.col += skipped
+        builder.pos += skipped
+      }
+      if (!m) { break }
+      pos += skipped + 1
+      var txt$1 = (void 0)
+      if (m[0] == "\t") {
+        var tabSize = builder.cm.options.tabSize, tabWidth = tabSize - builder.col % tabSize
+        txt$1 = content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"))
+        txt$1.setAttribute("role", "presentation")
+        txt$1.setAttribute("cm-text", "\t")
+        builder.col += tabWidth
+      } else if (m[0] == "\r" || m[0] == "\n") {
+        txt$1 = content.appendChild(elt("span", m[0] == "\r" ? "\u240d" : "\u2424", "cm-invalidchar"))
+        txt$1.setAttribute("cm-text", m[0])
+        builder.col += 1
+      } else {
+        txt$1 = builder.cm.options.specialCharPlaceholder(m[0])
+        txt$1.setAttribute("cm-text", m[0])
+        if (ie && ie_version < 9) { content.appendChild(elt("span", [txt$1])) }
+        else { content.appendChild(txt$1) }
+        builder.col += 1
+      }
+      builder.map.push(builder.pos, builder.pos + 1, txt$1)
+      builder.pos++
+    }
+  }
+  builder.trailingSpace = displayText.charCodeAt(text.length - 1) == 32
+  if (style || startStyle || endStyle || mustWrap || css) {
+    var fullStyle = style || ""
+    if (startStyle) { fullStyle += startStyle }
+    if (endStyle) { fullStyle += endStyle }
+    var token = elt("span", [content], fullStyle, css)
+    if (title) { token.title = title }
+    return builder.content.appendChild(token)
+  }
+  builder.content.appendChild(content)
+}
+
+function splitSpaces(text, trailingBefore) {
+  if (text.length > 1 && !/  /.test(text)) { return text }
+  var spaceBefore = trailingBefore, result = ""
+  for (var i = 0; i < text.length; i++) {
+    var ch = text.charAt(i)
+    if (ch == " " && spaceBefore && (i == text.length - 1 || text.charCodeAt(i + 1) == 32))
+      { ch = "\u00a0" }
+    result += ch
+    spaceBefore = ch == " "
+  }
+  return result
+}
+
+// Work around nonsense dimensions being reported for stretches of
+// right-to-left text.
+function buildTokenBadBidi(inner, order) {
+  return function (builder, text, style, startStyle, endStyle, title, css) {
+    style = style ? style + " cm-force-border" : "cm-force-border"
+    var start = builder.pos, end = start + text.length
+    for (;;) {
+      // Find the part that overlaps with the start of this text
+      var part = (void 0)
+      for (var i = 0; i < order.length; i++) {
+        part = order[i]
+        if (part.to > start && part.from <= start) { break }
+      }
+      if (part.to >= end) { return inner(builder, text, style, startStyle, endStyle, title, css) }
+      inner(builder, text.slice(0, part.to - start), style, startStyle, null, title, css)
+      startStyle = null
+      text = text.slice(part.to - start)
+      start = part.to
+    }
+  }
+}
+
+function buildCollapsedSpan(builder, size, marker, ignoreWidget) {
+  var widget = !ignoreWidget && marker.widgetNode
+  if (widget) { builder.map.push(builder.pos, builder.pos + size, widget) }
+  if (!ignoreWidget && builder.cm.display.input.needsContentAttribute) {
+    if (!widget)
+      { widget = builder.content.appendChild(document.createElement("span")) }
+    widget.setAttribute("cm-marker", marker.id)
+  }
+  if (widget) {
+    builder.cm.display.input.setUneditable(widget)
+    builder.content.appendChild(widget)
+  }
+  builder.pos += size
+  builder.trailingSpace = false
+}
+
+// Outputs a number of spans to make up a line, taking highlighting
+// and marked text into account.
+function insertLineContent(line, builder, styles) {
+  var spans = line.markedSpans, allText = line.text, at = 0
+  if (!spans) {
+    for (var i$1 = 1; i$1 < styles.length; i$1+=2)
+      { builder.addToken(builder, allText.slice(at, at = styles[i$1]), interpretTokenStyle(styles[i$1+1], builder.cm.options)) }
+    return
+  }
+
+  var len = allText.length, pos = 0, i = 1, text = "", style, css
+  var nextChange = 0, spanStyle, spanEndStyle, spanStartStyle, title, collapsed
+  for (;;) {
+    if (nextChange == pos) { // Update current marker set
+      spanStyle = spanEndStyle = spanStartStyle = title = css = ""
+      collapsed = null; nextChange = Infinity
+      var foundBookmarks = [], endStyles = (void 0)
+      for (var j = 0; j < spans.length; ++j) {
+        var sp = spans[j], m = sp.marker
+        if (m.type == "bookmark" && sp.from == pos && m.widgetNode) {
+          foundBookmarks.push(m)
+        } else if (sp.from <= pos && (sp.to == null || sp.to > pos || m.collapsed && sp.to == pos && sp.from == pos)) {
+          if (sp.to != null && sp.to != pos && nextChange > sp.to) {
+            nextChange = sp.to
+            spanEndStyle = ""
+          }
+          if (m.className) { spanStyle += " " + m.className }
+          if (m.css) { css = (css ? css + ";" : "") + m.css }
+          if (m.startStyle && sp.from == pos) { spanStartStyle += " " + m.startStyle }
+          if (m.endStyle && sp.to == nextChange) { (endStyles || (endStyles = [])).push(m.endStyle, sp.to) }
+          if (m.title && !title) { title = m.title }
+          if (m.collapsed && (!collapsed || compareCollapsedMarkers(collapsed.marker, m) < 0))
+            { collapsed = sp }
+        } else if (sp.from > pos && nextChange > sp.from) {
+          nextChange = sp.from
+        }
+      }
+      if (endStyles) { for (var j$1 = 0; j$1 < endStyles.length; j$1 += 2)
+        { if (endStyles[j$1 + 1] == nextChange) { spanEndStyle += " " + endStyles[j$1] } } }
+
+      if (!collapsed || collapsed.from == pos) { for (var j$2 = 0; j$2 < foundBookmarks.length; ++j$2)
+        { buildCollapsedSpan(builder, 0, foundBookmarks[j$2]) } }
+      if (collapsed && (collapsed.from || 0) == pos) {
+        buildCollapsedSpan(builder, (collapsed.to == null ? len + 1 : collapsed.to) - pos,
+                           collapsed.marker, collapsed.from == null)
+        if (collapsed.to == null) { return }
+        if (collapsed.to == pos) { collapsed = false }
+      }
+    }
+    if (pos >= len) { break }
+
+    var upto = Math.min(len, nextChange)
+    while (true) {
+      if (text) {
+        var end = pos + text.length
+        if (!collapsed) {
+          var tokenText = end > upto ? text.slice(0, upto - pos) : text
+          builder.addToken(builder, tokenText, style ? style + spanStyle : spanStyle,
+                           spanStartStyle, pos + tokenText.length == nextChange ? spanEndStyle : "", title, css)
+        }
+        if (end >= upto) {text = text.slice(upto - pos); pos = upto; break}
+        pos = end
+        spanStartStyle = ""
+      }
+      text = allText.slice(at, at = styles[i++])
+      style = interpretTokenStyle(styles[i++], builder.cm.options)
+    }
+  }
+}
+
+
+// These objects are used to represent the visible (currently drawn)
+// part of the document. A LineView may correspond to multiple
+// logical lines, if those are connected by collapsed ranges.
+function LineView(doc, line, lineN) {
+  // The starting line
+  this.line = line
+  // Continuing lines, if any
+  this.rest = visualLineContinued(line)
+  // Number of logical lines in this visual line
+  this.size = this.rest ? lineNo(lst(this.rest)) - lineN + 1 : 1
+  this.node = this.text = null
+  this.hidden = lineIsHidden(doc, line)
+}
+
+// Create a range of LineView objects for the given lines.
+function buildViewArray(cm, from, to) {
+  var array = [], nextPos
+  for (var pos = from; pos < to; pos = nextPos) {
+    var view = new LineView(cm.doc, getLine(cm.doc, pos), pos)
+    nextPos = pos + view.size
+    array.push(view)
+  }
+  return array
+}
+
+var operationGroup = null
+
+function pushOperation(op) {
+  if (operationGroup) {
+    operationGroup.ops.push(op)
+  } else {
+    op.ownsGroup = operationGroup = {
+      ops: [op],
+      delayedCallbacks: []
+    }
+  }
+}
+
+function fireCallbacksForOps(group) {
+  // Calls delayed callbacks and cursorActivity handlers until no
+  // new ones appear
+  var callbacks = group.delayedCallbacks, i = 0
+  do {
+    for (; i < callbacks.length; i++)
+      { callbacks[i].call(null) }
+    for (var j = 0; j < group.ops.length; j++) {
+      var op = group.ops[j]
+      if (op.cursorActivityHandlers)
+        { while (op.cursorActivityCalled < op.cursorActivityHandlers.length)
+          { op.cursorActivityHandlers[op.cursorActivityCalled++].call(null, op.cm) } }
+    }
+  } while (i < callbacks.length)
+}
+
+function finishOperation(op, endCb) {
+  var group = op.ownsGroup
+  if (!group) { return }
+
+  try { fireCallbacksForOps(group) }
+  finally {
+    operationGroup = null
+    endCb(group)
+  }
+}
+
+var orphanDelayedCallbacks = null
+
+// Often, we want to signal events at a point where we are in the
+// middle of some work, but don't want the handler to start calling
+// other methods on the editor, which might be in an inconsistent
+// state or simply not expect any other events to happen.
+// signalLater looks whether there are any handlers, and schedules
+// them to be executed when the last operation ends, or, if no
+// operation is active, when a timeout fires.
+function signalLater(emitter, type /*, values...*/) {
+  var arr = getHandlers(emitter, type)
+  if (!arr.length) { return }
+  var args = Array.prototype.slice.call(arguments, 2), list
+  if (operationGroup) {
+    list = operationGroup.delayedCallbacks
+  } else if (orphanDelayedCallbacks) {
+    list = orphanDelayedCallbacks
+  } else {
+    list = orphanDelayedCallbacks = []
+    setTimeout(fireOrphanDelayed, 0)
+  }
+  var loop = function ( i ) {
+    list.push(function () { return arr[i].apply(null, args); })
+  };
+
+  for (var i = 0; i < arr.length; ++i)
+    loop( i );
+}
+
+function fireOrphanDelayed() {
+  var delayed = orphanDelayedCallbacks
+  orphanDelayedCallbacks = null
+  for (var i = 0; i < delayed.length; ++i) { delayed[i]() }
+}
+
+// When an aspect of a line changes, a string is added to
+// lineView.changes. This updates the relevant part of the line's
+// DOM structure.
+function updateLineForChanges(cm, lineView, lineN, dims) {
+  for (var j = 0; j < lineView.changes.length; j++) {
+    var type = lineView.changes[j]
+    if (type == "text") { updateLineText(cm, lineView) }
+    else if (type == "gutter") { updateLineGutter(cm, lineView, lineN, dims) }
+    else if (type == "class") { updateLineClasses(cm, lineView) }
+    else if (type == "widget") { updateLineWidgets(cm, lineView, dims) }
+  }
+  lineView.changes = null
+}
+
+// Lines with gutter elements, widgets or a background class need to
+// be wrapped, and have the extra elements added to the wrapper div
+function ensureLineWrapped(lineView) {
+  if (lineView.node == lineView.text) {
+    lineView.node = elt("div", null, null, "position: relative")
+    if (lineView.text.parentNode)
+      { lineView.text.parentNode.replaceChild(lineView.node, lineView.text) }
+    lineView.node.appendChild(lineView.text)
+    if (ie && ie_version < 8) { lineView.node.style.zIndex = 2 }
+  }
+  return lineView.node
+}
+
+function updateLineBackground(cm, lineView) {
+  var cls = lineView.bgClass ? lineView.bgClass + " " + (lineView.line.bgClass || "") : lineView.line.bgClass
+  if (cls) { cls += " CodeMirror-linebackground" }
+  if (lineView.background) {
+    if (cls) { lineView.background.className = cls }
+    else { lineView.background.parentNode.removeChild(lineView.background); lineView.background = null }
+  } else if (cls) {
+    var wrap = ensureLineWrapped(lineView)
+    lineView.background = wrap.insertBefore(elt("div", null, cls), wrap.firstChild)
+    cm.display.input.setUneditable(lineView.background)
+  }
+}
+
+// Wrapper around buildLineContent which will reuse the structure
+// in display.externalMeasured when possible.
+function getLineContent(cm, lineView) {
+  var ext = cm.display.externalMeasured
+  if (ext && ext.line == lineView.line) {
+    cm.display.externalMeasured = null
+    lineView.measure = ext.measure
+    return ext.built
+  }
+  return buildLineContent(cm, lineView)
+}
+
+// Redraw the line's text. Interacts with the background and text
+// classes because the mode may output tokens that influence these
+// classes.
+function updateLineText(cm, lineView) {
+  var cls = lineView.text.className
+  var built = getLineContent(cm, lineView)
+  if (lineView.text == lineView.node) { lineView.node = built.pre }
+  lineView.text.parentNode.replaceChild(built.pre, lineView.text)
+  lineView.text = built.pre
+  if (built.bgClass != lineView.bgClass || built.textClass != lineView.textClass) {
+    lineView.bgClass = built.bgClass
+    lineView.textClass = built.textClass
+    updateLineClasses(cm, lineView)
+  } else if (cls) {
+    lineView.text.className = cls
+  }
+}
+
+function updateLineClasses(cm, lineView) {
+  updateLineBackground(cm, lineView)
+  if (lineView.line.wrapClass)
+    { ensureLineWrapped(lineView).className = lineView.line.wrapClass }
+  else if (lineView.node != lineView.text)
+    { lineView.node.className = "" }
+  var textClass = lineView.textClass ? lineView.textClass + " " + (lineView.line.textClass || "") : lineView.line.textClass
+  lineView.text.className = textClass || ""
+}
+
+function updateLineGutter(cm, lineView, lineN, dims) {
+  if (lineView.gutter) {
+    lineView.node.removeChild(lineView.gutter)
+    lineView.gutter = null
+  }
+  if (lineView.gutterBackground) {
+    lineView.node.removeChild(lineView.gutterBackground)
+    lineView.gutterBackground = null
+  }
+  if (lineView.line.gutterClass) {
+    var wrap = ensureLineWrapped(lineView)
+    lineView.gutterBackground = elt("div", null, "CodeMirror-gutter-background " + lineView.line.gutterClass,
+                                    ("left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px; width: " + (dims.gutterTotalWidth) + "px"))
+    cm.display.input.setUneditable(lineView.gutterBackground)
+    wrap.insertBefore(lineView.gutterBackground, lineView.text)
+  }
+  var markers = lineView.line.gutterMarkers
+  if (cm.options.lineNumbers || markers) {
+    var wrap$1 = ensureLineWrapped(lineView)
+    var gutterWrap = lineView.gutter = elt("div", null, "CodeMirror-gutter-wrapper", ("left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px"))
+    cm.display.input.setUneditable(gutterWrap)
+    wrap$1.insertBefore(gutterWrap, lineView.text)
+    if (lineView.line.gutterClass)
+      { gutterWrap.className += " " + lineView.line.gutterClass }
+    if (cm.options.lineNumbers && (!markers || !markers["CodeMirror-linenumbers"]))
+      { lineView.lineNumber = gutterWrap.appendChild(
+        elt("div", lineNumberFor(cm.options, lineN),
+            "CodeMirror-linenumber CodeMirror-gutter-elt",
+            ("left: " + (dims.gutterLeft["CodeMirror-linenumbers"]) + "px; width: " + (cm.display.lineNumInnerWidth) + "px"))) }
+    if (markers) { for (var k = 0; k < cm.options.gutters.length; ++k) {
+      var id = cm.options.gutters[k], found = markers.hasOwnProperty(id) && markers[id]
+      if (found)
+        { gutterWrap.appendChild(elt("div", [found], "CodeMirror-gutter-elt",
+                                   ("left: " + (dims.gutterLeft[id]) + "px; width: " + (dims.gutterWidth[id]) + "px"))) }
+    } }
+  }
+}
+
+function updateLineWidgets(cm, lineView, dims) {
+  if (lineView.alignable) { lineView.alignable = null }
+  for (var node = lineView.node.firstChild, next = (void 0); node; node = next) {
+    next = node.nextSibling
+    if (node.className == "CodeMirror-linewidget")
+      { lineView.node.removeChild(node) }
+  }
+  insertLineWidgets(cm, lineView, dims)
+}
+
+// Build a line's DOM representation from scratch
+function buildLineElement(cm, lineView, lineN, dims) {
+  var built = getLineContent(cm, lineView)
+  lineView.text = lineView.node = built.pre
+  if (built.bgClass) { lineView.bgClass = built.bgClass }
+  if (built.textClass) { lineView.textClass = built.textClass }
+
+  updateLineClasses(cm, lineView)
+  updateLineGutter(cm, lineView, lineN, dims)
+  insertLineWidgets(cm, lineView, dims)
+  return lineView.node
+}
+
+// A lineView may contain multiple logical lines (when merged by
+// collapsed spans). The widgets for all of them need to be drawn.
+function insertLineWidgets(cm, lineView, dims) {
+  insertLineWidgetsFor(cm, lineView.line, lineView, dims, true)
+  if (lineView.rest) { for (var i = 0; i < lineView.rest.length; i++)
+    { insertLineWidgetsFor(cm, lineView.rest[i], lineView, dims, false) } }
+}
+
+function insertLineWidgetsFor(cm, line, lineView, dims, allowAbove) {
+  if (!line.widgets) { return }
+  var wrap = ensureLineWrapped(lineView)
+  for (var i = 0, ws = line.widgets; i < ws.length; ++i) {
+    var widget = ws[i], node = elt("div", [widget.node], "CodeMirror-linewidget")
+    if (!widget.handleMouseEvents) { node.setAttribute("cm-ignore-events", "true") }
+    positionLineWidget(widget, node, lineView, dims)
+    cm.display.input.setUneditable(node)
+    if (allowAbove && widget.above)
+      { wrap.insertBefore(node, lineView.gutter || lineView.text) }
+    else
+      { wrap.appendChild(node) }
+    signalLater(widget, "redraw")
+  }
+}
+
+function positionLineWidget(widget, node, lineView, dims) {
+  if (widget.noHScroll) {
+    ;(lineView.alignable || (lineView.alignable = [])).push(node)
+    var width = dims.wrapperWidth
+    node.style.left = dims.fixedPos + "px"
+    if (!widget.coverGutter) {
+      width -= dims.gutterTotalWidth
+      node.style.paddingLeft = dims.gutterTotalWidth + "px"
+    }
+    node.style.width = width + "px"
+  }
+  if (widget.coverGutter) {
+    node.style.zIndex = 5
+    node.style.position = "relative"
+    if (!widget.noHScroll) { node.style.marginLeft = -dims.gutterTotalWidth + "px" }
+  }
+}
+
+function widgetHeight(widget) {
+  if (widget.height != null) { return widget.height }
+  var cm = widget.doc.cm
+  if (!cm) { return 0 }
+  if (!contains(document.body, widget.node)) {
+    var parentStyle = "position: relative;"
+    if (widget.coverGutter)
+      { parentStyle += "margin-left: -" + cm.display.gutters.offsetWidth + "px;" }
+    if (widget.noHScroll)
+      { parentStyle += "width: " + cm.display.wrapper.clientWidth + "px;" }
+    removeChildrenAndAdd(cm.display.measure, elt("div", [widget.node], null, parentStyle))
+  }
+  return widget.height = widget.node.parentNode.offsetHeight
+}
+
+// Return true when the given mouse event happened in a widget
+function eventInWidget(display, e) {
+  for (var n = e_target(e); n != display.wrapper; n = n.parentNode) {
+    if (!n || (n.nodeType == 1 && n.getAttribute("cm-ignore-events") == "true") ||
+        (n.parentNode == display.sizer && n != display.mover))
+      { return true }
+  }
+}
+
+// POSITION MEASUREMENT
+
+function paddingTop(display) {return display.lineSpace.offsetTop}
+function paddingVert(display) {return display.mover.offsetHeight - display.lineSpace.offsetHeight}
+function paddingH(display) {
+  if (display.cachedPaddingH) { return display.cachedPaddingH }
+  var e = removeChildrenAndAdd(display.measure, elt("pre", "x"))
+  var style = window.getComputedStyle ? window.getComputedStyle(e) : e.currentStyle
+  var data = {left: parseInt(style.paddingLeft), right: parseInt(style.paddingRight)}
+  if (!isNaN(data.left) && !isNaN(data.right)) { display.cachedPaddingH = data }
+  return data
+}
+
+function scrollGap(cm) { return scrollerGap - cm.display.nativeBarWidth }
+function displayWidth(cm) {
+  return cm.display.scroller.clientWidth - scrollGap(cm) - cm.display.barWidth
+}
+function displayHeight(cm) {
+  return cm.display.scroller.clientHeight - scrollGap(cm) - cm.display.barHeight
+}
+
+// Ensure the lineView.wrapping.heights array is populated. This is
+// an array of bottom offsets for the lines that make up a drawn
+// line. When lineWrapping is on, there might be more than one
+// height.
+function ensureLineHeights(cm, lineView, rect) {
+  var wrapping = cm.options.lineWrapping
+  var curWidth = wrapping && displayWidth(cm)
+  if (!lineView.measure.heights || wrapping && lineView.measure.width != curWidth) {
+    var heights = lineView.measure.heights = []
+    if (wrapping) {
+      lineView.measure.width = curWidth
+      var rects = lineView.text.firstChild.getClientRects()
+      for (var i = 0; i < rects.length - 1; i++) {
+        var cur = rects[i], next = rects[i + 1]
+        if (Math.abs(cur.bottom - next.bottom) > 2)
+          { heights.push((cur.bottom + next.top) / 2 - rect.top) }
+      }
+    }
+    heights.push(rect.bottom - rect.top)
+  }
+}
+
+// Find a line map (mapping character offsets to text nodes) and a
+// measurement cache for the given line number. (A line view might
+// contain multiple lines when collapsed ranges are present.)
+function mapFromLineView(lineView, line, lineN) {
+  if (lineView.line == line)
+    { return {map: lineView.measure.map, cache: lineView.measure.cache} }
+  for (var i = 0; i < lineView.rest.length; i++)
+    { if (lineView.rest[i] == line)
+      { return {map: lineView.measure.maps[i], cache: lineView.measure.caches[i]} } }
+  for (var i$1 = 0; i$1 < lineView.rest.length; i$1++)
+    { if (lineNo(lineView.rest[i$1]) > lineN)
+      { return {map: lineView.measure.maps[i$1], cache: lineView.measure.caches[i$1], before: true} } }
+}
+
+// Render a line into the hidden node display.externalMeasured. Used
+// when measurement is needed for a line that's not in the viewport.
+function updateExternalMeasurement(cm, line) {
+  line = visualLine(line)
+  var lineN = lineNo(line)
+  var view = cm.display.externalMeasured = new LineView(cm.doc, line, lineN)
+  view.lineN = lineN
+  var built = view.built = buildLineContent(cm, view)
+  view.text = built.pre
+  removeChildrenAndAdd(cm.display.lineMeasure, built.pre)
+  return view
+}
+
+// Get a {top, bottom, left, right} box (in line-local coordinates)
+// for a given character.
+function measureChar(cm, line, ch, bias) {
+  return measureCharPrepared(cm, prepareMeasureForLine(cm, line), ch, bias)
+}
+
+// Find a line view that corresponds to the given line number.
+function findViewForLine(cm, lineN) {
+  if (lineN >= cm.display.viewFrom && lineN < cm.display.viewTo)
+    { return cm.display.view[findViewIndex(cm, lineN)] }
+  var ext = cm.display.externalMeasured
+  if (ext && lineN >= ext.lineN && lineN < ext.lineN + ext.size)
+    { return ext }
+}
+
+// Measurement can be split in two steps, the set-up work that
+// applies to the whole line, and the measurement of the actual
+// character. Functions like coordsChar, that need to do a lot of
+// measurements in a row, can thus ensure that the set-up work is
+// only done once.
+function prepareMeasureForLine(cm, line) {
+  var lineN = lineNo(line)
+  var view = findViewForLine(cm, lineN)
+  if (view && !view.text) {
+    view = null
+  } else if (view && view.changes) {
+    updateLineForChanges(cm, view, lineN, getDimensions(cm))
+    cm.curOp.forceUpdate = true
+  }
+  if (!view)
+    { view = updateExternalMeasurement(cm, line) }
+
+  var info = mapFromLineView(view, line, lineN)
+  return {
+    line: line, view: view, rect: null,
+    map: info.map, cache: info.cache, before: info.before,
+    hasHeights: false
+  }
+}
+
+// Given a prepared measurement object, measures the position of an
+// actual character (or fetches it from the cache).
+function measureCharPrepared(cm, prepared, ch, bias, varHeight) {
+  if (prepared.before) { ch = -1 }
+  var key = ch + (bias || ""), found
+  if (prepared.cache.hasOwnProperty(key)) {
+    found = prepared.cache[key]
+  } else {
+    if (!prepared.rect)
+      { prepared.rect = prepared.view.text.getBoundingClientRect() }
+    if (!prepared.hasHeights) {
+      ensureLineHeights(cm, prepared.view, prepared.rect)
+      prepared.hasHeights = true
+    }
+    found = measureCharInner(cm, prepared, ch, bias)
+    if (!found.bogus) { prepared.cache[key] = found }
+  }
+  return {left: found.left, right: found.right,
+          top: varHeight ? found.rtop : found.top,
+          bottom: varHeight ? found.rbottom : found.bottom}
+}
+
+var nullRect = {left: 0, right: 0, top: 0, bottom: 0}
+
+function nodeAndOffsetInLineMap(map, ch, bias) {
+  var node, start, end, collapse, mStart, mEnd
+  // First, search the line map for the text node corresponding to,
+  // or closest to, the target character.
+  for (var i = 0; i < map.length; i += 3) {
+    mStart = map[i]
+    mEnd = map[i + 1]
+    if (ch < mStart) {
+      start = 0; end = 1
+      collapse = "left"
+    } else if (ch < mEnd) {
+      start = ch - mStart
+      end = start + 1
+    } else if (i == map.length - 3 || ch == mEnd && map[i + 3] > ch) {
+      end = mEnd - mStart
+      start = end - 1
+      if (ch >= mEnd) { collapse = "right" }
+    }
+    if (start != null) {
+      node = map[i + 2]
+      if (mStart == mEnd && bias == (node.insertLeft ? "left" : "right"))
+        { collapse = bias }
+      if (bias == "left" && start == 0)
+        { while (i && map[i - 2] == map[i - 3] && map[i - 1].insertLeft) {
+          node = map[(i -= 3) + 2]
+          collapse = "left"
+        } }
+      if (bias == "right" && start == mEnd - mStart)
+        { while (i < map.length - 3 && map[i + 3] == map[i + 4] && !map[i + 5].insertLeft) {
+          node = map[(i += 3) + 2]
+          collapse = "right"
+        } }
+      break
+    }
+  }
+  return {node: node, start: start, end: end, collapse: collapse, coverStart: mStart, coverEnd: mEnd}
+}
+
+function getUsefulRect(rects, bias) {
+  var rect = nullRect
+  if (bias == "left") { for (var i = 0; i < rects.length; i++) {
+    if ((rect = rects[i]).left != rect.right) { break }
+  } } else { for (var i$1 = rects.length - 1; i$1 >= 0; i$1--) {
+    if ((rect = rects[i$1]).left != rect.right) { break }
+  } }
+  return rect
+}
+
+function measureCharInner(cm, prepared, ch, bias) {
+  var place = nodeAndOffsetInLineMap(prepared.map, ch, bias)
+  var node = place.node, start = place.start, end = place.end, collapse = place.collapse
+
+  var rect
+  if (node.nodeType == 3) { // If it is a text node, use a range to retrieve the coordinates.
+    for (var i$1 = 0; i$1 < 4; i$1++) { // Retry a maximum of 4 times when nonsense rectangles are returned
+      while (start && isExtendingChar(prepared.line.text.charAt(place.coverStart + start))) { --start }
+      while (place.coverStart + end < place.coverEnd && isExtendingChar(prepared.line.text.charAt(place.coverStart + end))) { ++end }
+      if (ie && ie_version < 9 && start == 0 && end == place.coverEnd - place.coverStart)
+        { rect = node.parentNode.getBoundingClientRect() }
+      else
+        { rect = getUsefulRect(range(node, start, end).getClientRects(), bias) }
+      if (rect.left || rect.right || start == 0) { break }
+      end = start
+      start = start - 1
+      collapse = "right"
+    }
+    if (ie && ie_version < 11) { rect = maybeUpdateRectForZooming(cm.display.measure, rect) }
+  } else { // If it is a widget, simply get the box for the whole widget.
+    if (start > 0) { collapse = bias = "right" }
+    var rects
+    if (cm.options.lineWrapping && (rects = node.getClientRects()).length > 1)
+      { rect = rects[bias == "right" ? rects.length - 1 : 0] }
+    else
+      { rect = node.getBoundingClientRect() }
+  }
+  if (ie && ie_version < 9 && !start && (!rect || !rect.left && !rect.right)) {
+    var rSpan = node.parentNode.getClientRects()[0]
+    if (rSpan)
+      { rect = {left: rSpan.left, right: rSpan.left + charWidth(cm.display), top: rSpan.top, bottom: rSpan.bottom} }
+    else
+      { rect = nullRect }
+  }
+
+  var rtop = rect.top - prepared.rect.top, rbot = rect.bottom - prepared.rect.top
+  var mid = (rtop + rbot) / 2
+  var heights = prepared.view.measure.heights
+  var i = 0
+  for (; i < heights.length - 1; i++)
+    { if (mid < heights[i]) { break } }
+  var top = i ? heights[i - 1] : 0, bot = heights[i]
+  var result = {left: (collapse == "right" ? rect.right : rect.left) - prepared.rect.left,
+                right: (collapse == "left" ? rect.left : rect.right) - prepared.rect.left,
+                top: top, bottom: bot}
+  if (!rect.left && !rect.right) { result.bogus = true }
+  if (!cm.options.singleCursorHeightPerLine) { result.rtop = rtop; result.rbottom = rbot }
+
+  return result
+}
+
+// Work around problem with bounding client rects on ranges being
+// returned incorrectly when zoomed on IE10 and below.
+function maybeUpdateRectForZooming(measure, rect) {
+  if (!window.screen || screen.logicalXDPI == null ||
+      screen.logicalXDPI == screen.deviceXDPI || !hasBadZoomedRects(measure))
+    { return rect }
+  var scaleX = screen.logicalXDPI / screen.deviceXDPI
+  var scaleY = screen.logicalYDPI / screen.deviceYDPI
+  return {left: rect.left * scaleX, right: rect.right * scaleX,
+          top: rect.top * scaleY, bottom: rect.bottom * scaleY}
+}
+
+function clearLineMeasurementCacheFor(lineView) {
+  if (lineView.measure) {
+    lineView.measure.cache = {}
+    lineView.measure.heights = null
+    if (lineView.rest) { for (var i = 0; i < lineView.rest.length; i++)
+      { lineView.measure.caches[i] = {} } }
+  }
+}
+
+function clearLineMeasurementCache(cm) {
+  cm.display.externalMeasure = null
+  removeChildren(cm.display.lineMeasure)
+  for (var i = 0; i < cm.display.view.length; i++)
+    { clearLineMeasurementCacheFor(cm.display.view[i]) }
+}
+
+function clearCaches(cm) {
+  clearLineMeasurementCache(cm)
+  cm.display.cachedCharWidth = cm.display.cachedTextHeight = cm.display.cachedPaddingH = null
+  if (!cm.options.lineWrapping) { cm.display.maxLineChanged = true }
+  cm.display.lineNumChars = null
+}
+
+function pageScrollX() {
+  // Work around https://bugs.chromium.org/p/chromium/issues/detail?id=489206
+  // which causes page_Offset and bounding client rects to use
+  // different reference viewports and invalidate our calculations.
+  if (chrome && android) { return -(document.body.getBoundingClientRect().left - parseInt(getComputedStyle(document.body).marginLeft)) }
+  return window.pageXOffset || (document.documentElement || document.body).scrollLeft
+}
+function pageScrollY() {
+  if (chrome && android) { return -(document.body.getBoundingClientRect().top - parseInt(getComputedStyle(document.body).marginTop)) }
+  return window.pageYOffset || (document.documentElement || document.body).scrollTop
+}
+
+// Converts a {top, bottom, left, right} box from line-local
+// coordinates into another coordinate system. Context may be one of
+// "line", "div" (display.lineDiv), "local"./null (editor), "window",
+// or "page".
+function intoCoordSystem(cm, lineObj, rect, context, includeWidgets) {
+  if (!includeWidgets && lineObj.widgets) { for (var i = 0; i < lineObj.widgets.length; ++i) { if (lineObj.widgets[i].above) {
+    var size = widgetHeight(lineObj.widgets[i])
+    rect.top += size; rect.bottom += size
+  } } }
+  if (context == "line") { return rect }
+  if (!context) { context = "local" }
+  var yOff = heightAtLine(lineObj)
+  if (context == "local") { yOff += paddingTop(cm.display) }
+  else { yOff -= cm.display.viewOffset }
+  if (context == "page" || context == "window") {
+    var lOff = cm.display.lineSpace.getBoundingClientRect()
+    yOff += lOff.top + (context == "window" ? 0 : pageScrollY())
+    var xOff = lOff.left + (context == "window" ? 0 : pageScrollX())
+    rect.left += xOff; rect.right += xOff
+  }
+  rect.top += yOff; rect.bottom += yOff
+  return rect
+}
+
+// Coverts a box from "div" coords to another coordinate system.
+// Context may be "window", "page", "div", or "local"./null.
+function fromCoordSystem(cm, coords, context) {
+  if (context == "div") { return coords }
+  var left = coords.left, top = coords.top
+  // First move into "page" coordinate system
+  if (context == "page") {
+    left -= pageScrollX()
+    top -= pageScrollY()
+  } else if (context == "local" || !context) {
+    var localBox = cm.display.sizer.getBoundingClientRect()
+    left += localBox.left
+    top += localBox.top
+  }
+
+  var lineSpaceBox = cm.display.lineSpace.getBoundingClientRect()
+  return {left: left - lineSpaceBox.left, top: top - lineSpaceBox.top}
+}
+
+function charCoords(cm, pos, context, lineObj, bias) {
+  if (!lineObj) { lineObj = getLine(cm.doc, pos.line) }
+  return intoCoordSystem(cm, lineObj, measureChar(cm, lineObj, pos.ch, bias), context)
+}
+
+// Returns a box for a given cursor position, which may have an
+// 'other' property containing the position of the secondary cursor
+// on a bidi boundary.
+// A cursor Pos(line, char, "before") is on the same visual line as `char - 1`
+// and after `char - 1` in writing order of `char - 1`
+// A cursor Pos(line, char, "after") is on the same visual line as `char`
+// and before `char` in writing order of `char`
+// Examples (upper-case letters are RTL, lower-case are LTR):
+//     Pos(0, 1, ...)
+//     before   after
+// ab     a|b     a|b
+// aB     a|B     aB|
+// Ab     |Ab     A|b
+// AB     B|A     B|A
+// Every position after the last character on a line is considered to stick
+// to the last character on the line.
+function cursorCoords(cm, pos, context, lineObj, preparedMeasure, varHeight) {
+  lineObj = lineObj || getLine(cm.doc, pos.line)
+  if (!preparedMeasure) { preparedMeasure = prepareMeasureForLine(cm, lineObj) }
+  function get(ch, right) {
+    var m = measureCharPrepared(cm, preparedMeasure, ch, right ? "right" : "left", varHeight)
+    if (right) { m.left = m.right; } else { m.right = m.left }
+    return intoCoordSystem(cm, lineObj, m, context)
+  }
+  var order = getOrder(lineObj, cm.doc.direction), ch = pos.ch, sticky = pos.sticky
+  if (ch >= lineObj.text.length) {
+    ch = lineObj.text.length
+    sticky = "before"
+  } else if (ch <= 0) {
+    ch = 0
+    sticky = "after"
+  }
+  if (!order) { return get(sticky == "before" ? ch - 1 : ch, sticky == "before") }
+
+  function getBidi(ch, partPos, invert) {
+    var part = order[partPos], right = (part.level % 2) != 0
+    return get(invert ? ch - 1 : ch, right != invert)
+  }
+  var partPos = getBidiPartAt(order, ch, sticky)
+  var other = bidiOther
+  var val = getBidi(ch, partPos, sticky == "before")
+  if (other != null) { val.other = getBidi(ch, other, sticky != "before") }
+  return val
+}
+
+// Used to cheaply estimate the coordinates for a position. Used for
+// intermediate scroll updates.
+function estimateCoords(cm, pos) {
+  var left = 0
+  pos = clipPos(cm.doc, pos)
+  if (!cm.options.lineWrapping) { left = charWidth(cm.display) * pos.ch }
+  var lineObj = getLine(cm.doc, pos.line)
+  var top = heightAtLine(lineObj) + paddingTop(cm.display)
+  return {left: left, right: left, top: top, bottom: top + lineObj.height}
+}
+
+// Positions returned by coordsChar contain some extra information.
+// xRel is the relative x position of the input coordinates compared
+// to the found position (so xRel > 0 means the coordinates are to
+// the right of the character position, for example). When outside
+// is true, that means the coordinates lie outside the line's
+// vertical range.
+function PosWithInfo(line, ch, sticky, outside, xRel) {
+  var pos = Pos(line, ch, sticky)
+  pos.xRel = xRel
+  if (outside) { pos.outside = true }
+  return pos
+}
+
+// Compute the character position closest to the given coordinates.
+// Input must be lineSpace-local ("div" coordinate system).
+function coordsChar(cm, x, y) {
+  var doc = cm.doc
+  y += cm.display.viewOffset
+  if (y < 0) { return PosWithInfo(doc.first, 0, null, true, -1) }
+  var lineN = lineAtHeight(doc, y), last = doc.first + doc.size - 1
+  if (lineN > last)
+    { return PosWithInfo(doc.first + doc.size - 1, getLine(doc, last).text.length, null, true, 1) }
+  if (x < 0) { x = 0 }
+
+  var lineObj = getLine(doc, lineN)
+  for (;;) {
+    var found = coordsCharInner(cm, lineObj, lineN, x, y)
+    var merged = collapsedSpanAtEnd(lineObj)
+    var mergedPos = merged && merged.find(0, true)
+    if (merged && (found.ch > mergedPos.from.ch || found.ch == mergedPos.from.ch && found.xRel > 0))
+      { lineN = lineNo(lineObj = mergedPos.to.line) }
+    else
+      { return found }
+  }
+}
+
+function wrappedLineExtent(cm, lineObj, preparedMeasure, y) {
+  var measure = function (ch) { return intoCoordSystem(cm, lineObj, measureCharPrepared(cm, preparedMeasure, ch), "line"); }
+  var end = lineObj.text.length
+  var begin = findFirst(function (ch) { return measure(ch - 1).bottom <= y; }, end, 0)
+  end = findFirst(function (ch) { return measure(ch).top > y; }, begin, end)
+  return {begin: begin, end: end}
+}
+
+function wrappedLineExtentChar(cm, lineObj, preparedMeasure, target) {
+  var targetTop = intoCoordSystem(cm, lineObj, measureCharPrepared(cm, preparedMeasure, target), "line").top
+  return wrappedLineExtent(cm, lineObj, preparedMeasure, targetTop)
+}
+
+function coordsCharInner(cm, lineObj, lineNo, x, y) {
+  y -= heightAtLine(lineObj)
+  var begin = 0, end = lineObj.text.length
+  var preparedMeasure = prepareMeasureForLine(cm, lineObj)
+  var pos
+  var order = getOrder(lineObj, cm.doc.direction)
+  if (order) {
+    if (cm.options.lineWrapping) {
+      ;var assign;
+      ((assign = wrappedLineExtent(cm, lineObj, preparedMeasure, y), begin = assign.begin, end = assign.end, assign))
+    }
+    pos = new Pos(lineNo, begin)
+    var beginLeft = cursorCoords(cm, pos, "line", lineObj, preparedMeasure).left
+    var dir = beginLeft < x ? 1 : -1
+    var prevDiff, diff = beginLeft - x, prevPos
+    do {
+      prevDiff = diff
+      prevPos = pos
+      pos = moveVisually(cm, lineObj, pos, dir)
+      if (pos == null || pos.ch < begin || end <= (pos.sticky == "before" ? pos.ch - 1 : pos.ch)) {
+        pos = prevPos
+        break
+      }
+      diff = cursorCoords(cm, pos, "line", lineObj, preparedMeasure).left - x
+    } while ((dir < 0) != (diff < 0) && (Math.abs(diff) <= Math.abs(prevDiff)))
+    if (Math.abs(diff) > Math.abs(prevDiff)) {
+      if ((diff < 0) == (prevDiff < 0)) { throw new Error("Broke out of infinite loop in coordsCharInner") }
+      pos = prevPos
+    }
+  } else {
+    var ch = findFirst(function (ch) {
+      var box = intoCoordSystem(cm, lineObj, measureCharPrepared(cm, preparedMeasure, ch), "line")
+      if (box.top > y) {
+        // For the cursor stickiness
+        end = Math.min(ch, end)
+        return true
+      }
+      else if (box.bottom <= y) { return false }
+      else if (box.left > x) { return true }
+      else if (box.right < x) { return false }
+      else { return (x - box.left < box.right - x) }
+    }, begin, end)
+    ch = skipExtendingChars(lineObj.text, ch, 1)
+    pos = new Pos(lineNo, ch, ch == end ? "before" : "after")
+  }
+  var coords = cursorCoords(cm, pos, "line", lineObj, preparedMeasure)
+  if (y < coords.top || coords.bottom < y) { pos.outside = true }
+  pos.xRel = x < coords.left ? -1 : (x > coords.right ? 1 : 0)
+  return pos
+}
+
+var measureText
+// Compute the default text height.
+function textHeight(display) {
+  if (display.cachedTextHeight != null) { return display.cachedTextHeight }
+  if (measureText == null) {
+    measureText = elt("pre")
+    // Measure a bunch of lines, for browsers that compute
+    // fractional heights.
+    for (var i = 0; i < 49; ++i) {
+      measureText.appendChild(document.createTextNode("x"))
+      measureText.appendChild(elt("br"))
+    }
+    measureText.appendChild(document.createTextNode("x"))
+  }
+  removeChildrenAndAdd(display.measure, measureText)
+  var height = measureText.offsetHeight / 50
+  if (height > 3) { display.cachedTextHeight = height }
+  removeChildren(display.measure)
+  return height || 1
+}
+
+// Compute the default character width.
+function charWidth(display) {
+  if (display.cachedCharWidth != null) { return display.cachedCharWidth }
+  var anchor = elt("span", "xxxxxxxxxx")
+  var pre = elt("pre", [anchor])
+  removeChildrenAndAdd(display.measure, pre)
+  var rect = anchor.getBoundingClientRect(), width = (rect.right - rect.left) / 10
+  if (width > 2) { display.cachedCharWidth = width }
+  return width || 10
+}
+
+// Do a bulk-read of the DOM positions and sizes needed to draw the
+// view, so that we don't interleave reading and writing to the DOM.
+function getDimensions(cm) {
+  var d = cm.display, left = {}, width = {}
+  var gutterLeft = d.gutters.clientLeft
+  for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {
+    left[cm.options.gutters[i]] = n.offsetLeft + n.clientLeft + gutterLeft
+    width[cm.options.gutters[i]] = n.clientWidth
+  }
+  return {fixedPos: compensateForHScroll(d),
+          gutterTotalWidth: d.gutters.offsetWidth,
+          gutterLeft: left,
+          gutterWidth: width,
+          wrapperWidth: d.wrapper.clientWidth}
+}
+
+// Computes display.scroller.scrollLeft + display.gutters.offsetWidth,
+// but using getBoundingClientRect to get a sub-pixel-accurate
+// result.
+function compensateForHScroll(display) {
+  return display.scroller.getBoundingClientRect().left - display.sizer.getBoundingClientRect().left
+}
+
+// Returns a function that estimates the height of a line, to use as
+// first approximation until the line becomes visible (and is thus
+// properly measurable).
+function estimateHeight(cm) {
+  var th = textHeight(cm.display), wrapping = cm.options.lineWrapping
+  var perLine = wrapping && Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3)
+  return function (line) {
+    if (lineIsHidden(cm.doc, line)) { return 0 }
+
+    var widgetsHeight = 0
+    if (line.widgets) { for (var i = 0; i < line.widgets.length; i++) {
+      if (line.widgets[i].height) { widgetsHeight += line.widgets[i].height }
+    } }
+
+    if (wrapping)
+      { return widgetsHeight + (Math.ceil(line.text.length / perLine) || 1) * th }
+    else
+      { return widgetsHeight + th }
+  }
+}
+
+function estimateLineHeights(cm) {
+  var doc = cm.doc, est = estimateHeight(cm)
+  doc.iter(function (line) {
+    var estHeight = est(line)
+    if (estHeight != line.height) { updateLineHeight(line, estHeight) }
+  })
+}
+
+// Given a mouse event, find the corresponding position. If liberal
+// is false, it checks whether a gutter or scrollbar was clicked,
+// and returns null if it was. forRect is used by rectangular
+// selections, and tries to estimate a character position even for
+// coordinates beyond the right of the text.
+function posFromMouse(cm, e, liberal, forRect) {
+  var display = cm.display
+  if (!liberal && e_target(e).getAttribute("cm-not-content") == "true") { return null }
+
+  var x, y, space = display.lineSpace.getBoundingClientRect()
+  // Fails unpredictably on IE[67] when mouse is dragged around quickly.
+  try { x = e.clientX - space.left; y = e.clientY - space.top }
+  catch (e) { return null }
+  var coords = coordsChar(cm, x, y), line
+  if (forRect && coords.xRel == 1 && (line = getLine(cm.doc, coords.line).text).length == coords.ch) {
+    var colDiff = countColumn(line, line.length, cm.options.tabSize) - line.length
+    coords = Pos(coords.line, Math.max(0, Math.round((x - paddingH(cm.display).left) / charWidth(cm.display)) - colDiff))
+  }
+  return coords
+}
+
+// Find the view element corresponding to a given line. Return null
+// when the line isn't visible.
+function findViewIndex(cm, n) {
+  if (n >= cm.display.viewTo) { return null }
+  n -= cm.display.viewFrom
+  if (n < 0) { return null }
+  var view = cm.display.view
+  for (var i = 0; i < view.length; i++) {
+    n -= view[i].size
+    if (n < 0) { return i }
+  }
+}
+
+function updateSelection(cm) {
+  cm.display.input.showSelection(cm.display.input.prepareSelection())
+}
+
+function prepareSelection(cm, primary) {
+  var doc = cm.doc, result = {}
+  var curFragment = result.cursors = document.createDocumentFragment()
+  var selFragment = result.selection = document.createDocumentFragment()
+
+  for (var i = 0; i < doc.sel.ranges.length; i++) {
+    if (primary === false && i == doc.sel.primIndex) { continue }
+    var range = doc.sel.ranges[i]
+    if (range.from().line >= cm.display.viewTo || range.to().line < cm.display.viewFrom) { continue }
+    var collapsed = range.empty()
+    if (collapsed || cm.options.showCursorWhenSelecting)
+      { drawSelectionCursor(cm, range.head, curFragment) }
+    if (!collapsed)
+      { drawSelectionRange(cm, range, selFragment) }
+  }
+  return result
+}
+
+// Draws a cursor for the given range
+function drawSelectionCursor(cm, head, output) {
+  var pos = cursorCoords(cm, head, "div", null, null, !cm.options.singleCursorHeightPerLine)
+
+  var cursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor"))
+  cursor.style.left = pos.left + "px"
+  cursor.style.top = pos.top + "px"
+  cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px"
+
+  if (pos.other) {
+    // Secondary cursor, shown when on a 'jump' in bi-directional text
+    var otherCursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor"))
+    otherCursor.style.display = ""
+    otherCursor.style.left = pos.other.left + "px"
+    otherCursor.style.top = pos.other.top + "px"
+    otherCursor.style.height = (pos.other.bottom - pos.other.top) * .85 + "px"
+  }
+}
+
+// Draws the given range as a highlighted selection
+function drawSelectionRange(cm, range, output) {
+  var display = cm.display, doc = cm.doc
+  var fragment = document.createDocumentFragment()
+  var padding = paddingH(cm.display), leftSide = padding.left
+  var rightSide = Math.max(display.sizerWidth, displayWidth(cm) - display.sizer.offsetLeft) - padding.right
+
+  function add(left, top, width, bottom) {
+    if (top < 0) { top = 0 }
+    top = Math.round(top)
+    bottom = Math.round(bottom)
+    fragment.appendChild(elt("div", null, "CodeMirror-selected", ("position: absolute; left: " + left + "px;\n                             top: " + top + "px; width: " + (width == null ? rightSide - left : width) + "px;\n                             height: " + (bottom - top) + "px")))
+  }
+
+  function drawForLine(line, fromArg, toArg) {
+    var lineObj = getLine(doc, line)
+    var lineLen = lineObj.text.length
+    var start, end
+    function coords(ch, bias) {
+      return charCoords(cm, Pos(line, ch), "div", lineObj, bias)
+    }
+
+    iterateBidiSections(getOrder(lineObj, doc.direction), fromArg || 0, toArg == null ? lineLen : toArg, function (from, to, dir) {
+      var leftPos = coords(from, "left"), rightPos, left, right
+      if (from == to) {
+        rightPos = leftPos
+        left = right = leftPos.left
+      } else {
+        rightPos = coords(to - 1, "right")
+        if (dir == "rtl") { var tmp = leftPos; leftPos = rightPos; rightPos = tmp }
+        left = leftPos.left
+        right = rightPos.right
+      }
+      if (fromArg == null && from == 0) { left = leftSide }
+      if (rightPos.top - leftPos.top > 3) { // Different lines, draw top part
+        add(left, leftPos.top, null, leftPos.bottom)
+        left = leftSide
+        if (leftPos.bottom < rightPos.top) { add(left, leftPos.bottom, null, rightPos.top) }
+      }
+      if (toArg == null && to == lineLen) { right = rightSide }
+      if (!start || leftPos.top < start.top || leftPos.top == start.top && leftPos.left < start.left)
+        { start = leftPos }
+      if (!end || rightPos.bottom > end.bottom || rightPos.bottom == end.bottom && rightPos.right > end.right)
+        { end = rightPos }
+      if (left < leftSide + 1) { left = leftSide }
+      add(left, rightPos.top, right - left, rightPos.bottom)
+    })
+    return {start: start, end: end}
+  }
+
+  var sFrom = range.from(), sTo = range.to()
+  if (sFrom.line == sTo.line) {
+    drawForLine(sFrom.line, sFrom.ch, sTo.ch)
+  } else {
+    var fromLine = getLine(doc, sFrom.line), toLine = getLine(doc, sTo.line)
+    var singleVLine = visualLine(fromLine) == visualLine(toLine)
+    var leftEnd = drawForLine(sFrom.line, sFrom.ch, singleVLine ? fromLine.text.length + 1 : null).end
+    var rightStart = drawForLine(sTo.line, singleVLine ? 0 : null, sTo.ch).start
+    if (singleVLine) {
+      if (leftEnd.top < rightStart.top - 2) {
+        add(leftEnd.right, leftEnd.top, null, leftEnd.bottom)
+        add(leftSide, rightStart.top, rightStart.left, rightStart.bottom)
+      } else {
+        add(leftEnd.right, leftEnd.top, rightStart.left - leftEnd.right, leftEnd.bottom)
+      }
+    }
+    if (leftEnd.bottom < rightStart.top)
+      { add(leftSide, leftEnd.bottom, null, rightStart.top) }
+  }
+
+  output.appendChild(fragment)
+}
+
+// Cursor-blinking
+function restartBlink(cm) {
+  if (!cm.state.focused) { return }
+  var display = cm.display
+  clearInterval(display.blinker)
+  var on = true
+  display.cursorDiv.style.visibility = ""
+  if (cm.options.cursorBlinkRate > 0)
+    { display.blinker = setInterval(function () { return display.cursorDiv.style.visibility = (on = !on) ? "" : "hidden"; },
+      cm.options.cursorBlinkRate) }
+  else if (cm.options.cursorBlinkRate < 0)
+    { display.cursorDiv.style.visibility = "hidden" }
+}
+
+function ensureFocus(cm) {
+  if (!cm.state.focused) { cm.display.input.focus(); onFocus(cm) }
+}
+
+function delayBlurEvent(cm) {
+  cm.state.delayingBlurEvent = true
+  setTimeout(function () { if (cm.state.delayingBlurEvent) {
+    cm.state.delayingBlurEvent = false
+    onBlur(cm)
+  } }, 100)
+}
+
+function onFocus(cm, e) {
+  if (cm.state.delayingBlurEvent) { cm.state.delayingBlurEvent = false }
+
+  if (cm.options.readOnly == "nocursor") { return }
+  if (!cm.state.focused) {
+    signal(cm, "focus", cm, e)
+    cm.state.focused = true
+    addClass(cm.display.wrapper, "CodeMirror-focused")
+    // This test prevents this from firing when a context
+    // menu is closed (since the input reset would kill the
+    // select-all detection hack)
+    if (!cm.curOp && cm.display.selForContextMenu != cm.doc.sel) {
+      cm.display.input.reset()
+      if (webkit) { setTimeout(function () { return cm.display.input.reset(true); }, 20) } // Issue #1730
+    }
+    cm.display.input.receivedFocus()
+  }
+  restartBlink(cm)
+}
+function onBlur(cm, e) {
+  if (cm.state.delayingBlurEvent) { return }
+
+  if (cm.state.focused) {
+    signal(cm, "blur", cm, e)
+    cm.state.focused = false
+    rmClass(cm.display.wrapper, "CodeMirror-focused")
+  }
+  clearInterval(cm.display.blinker)
+  setTimeout(function () { if (!cm.state.focused) { cm.display.shift = false } }, 150)
+}
+
+// Re-align line numbers and gutter marks to compensate for
+// horizontal scrolling.
+function alignHorizontally(cm) {
+  var display = cm.display, view = display.view
+  if (!display.alignWidgets && (!display.gutters.firstChild || !cm.options.fixedGutter)) { return }
+  var comp = compensateForHScroll(display) - display.scroller.scrollLeft + cm.doc.scrollLeft
+  var gutterW = display.gutters.offsetWidth, left = comp + "px"
+  for (var i = 0; i < view.length; i++) { if (!view[i].hidden) {
+    if (cm.options.fixedGutter) {
+      if (view[i].gutter)
+        { view[i].gutter.style.left = left }
+      if (view[i].gutterBackground)
+        { view[i].gutterBackground.style.left = left }
+    }
+    var align = view[i].alignable
+    if (align) { for (var j = 0; j < align.length; j++)
+      { align[j].style.left = left } }
+  } }
+  if (cm.options.fixedGutter)
+    { display.gutters.style.left = (comp + gutterW) + "px" }
+}
+
+// Used to ensure that the line number gutter is still the right
+// size for the current document size. Returns true when an update
+// is needed.
+function maybeUpdateLineNumberWidth(cm) {
+  if (!cm.options.lineNumbers) { return false }
+  var doc = cm.doc, last = lineNumberFor(cm.options, doc.first + doc.size - 1), display = cm.display
+  if (last.length != display.lineNumChars) {
+    var test = display.measure.appendChild(elt("div", [elt("div", last)],
+                                               "CodeMirror-linenumber CodeMirror-gutter-elt"))
+    var innerW = test.firstChild.offsetWidth, padding = test.offsetWidth - innerW
+    display.lineGutter.style.width = ""
+    display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding) + 1
+    display.lineNumWidth = display.lineNumInnerWidth + padding
+    display.lineNumChars = display.lineNumInnerWidth ? last.length : -1
+    display.lineGutter.style.width = display.lineNumWidth + "px"
+    updateGutterSpace(cm)
+    return true
+  }
+  return false
+}
+
+// Read the actual heights of the rendered lines, and update their
+// stored heights to match.
+function updateHeightsInViewport(cm) {
+  var display = cm.display
+  var prevBottom = display.lineDiv.offsetTop
+  for (var i = 0; i < display.view.length; i++) {
+    var cur = display.view[i], height = (void 0)
+    if (cur.hidden) { continue }
+    if (ie && ie_version < 8) {
+      var bot = cur.node.offsetTop + cur.node.offsetHeight
+      height = bot - prevBottom
+      prevBottom = bot
+    } else {
+      var box = cur.node.getBoundingClientRect()
+      height = box.bottom - box.top
+    }
+    var diff = cur.line.height - height
+    if (height < 2) { height = textHeight(display) }
+    if (diff > .001 || diff < -.001) {
+      updateLineHeight(cur.line, height)
+      updateWidgetHeight(cur.line)
+      if (cur.rest) { for (var j = 0; j < cur.rest.length; j++)
+        { updateWidgetHeight(cur.rest[j]) } }
+    }
+  }
+}
+
+// Read and store the height of line widgets associated with the
+// given line.
+function updateWidgetHeight(line) {
+  if (line.widgets) { for (var i = 0; i < line.widgets.length; ++i)
+    { line.widgets[i].height = line.widgets[i].node.parentNode.offsetHeight } }
+}
+
+// Compute the lines that are visible in a given viewport (defaults
+// the the current scroll position). viewport may contain top,
+// height, and ensure (see op.scrollToPos) properties.
+function visibleLines(display, doc, viewport) {
+  var top = viewport && viewport.top != null ? Math.max(0, viewport.top) : display.scroller.scrollTop
+  top = Math.floor(top - paddingTop(display))
+  var bottom = viewport && viewport.bottom != null ? viewport.bottom : top + display.wrapper.clientHeight
+
+  var from = lineAtHeight(doc, top), to = lineAtHeight(doc, bottom)
+  // Ensure is a {from: {line, ch}, to: {line, ch}} object, and
+  // forces those lines into the viewport (if possible).
+  if (viewport && viewport.ensure) {
+    var ensureFrom = viewport.ensure.from.line, ensureTo = viewport.ensure.to.line
+    if (ensureFrom < from) {
+      from = ensureFrom
+      to = lineAtHeight(doc, heightAtLine(getLine(doc, ensureFrom)) + display.wrapper.clientHeight)
+    } else if (Math.min(ensureTo, doc.lastLine()) >= to) {
+      from = lineAtHeight(doc, heightAtLine(getLine(doc, ensureTo)) - display.wrapper.clientHeight)
+      to = ensureTo
+    }
+  }
+  return {from: from, to: Math.max(to, from + 1)}
+}
+
+// Sync the scrollable area and scrollbars, ensure the viewport
+// covers the visible area.
+function setScrollTop(cm, val) {
+  if (Math.abs(cm.doc.scrollTop - val) < 2) { return }
+  cm.doc.scrollTop = val
+  if (!gecko) { updateDisplaySimple(cm, {top: val}) }
+  if (cm.display.scroller.scrollTop != val) { cm.display.scroller.scrollTop = val }
+  cm.display.scrollbars.setScrollTop(val)
+  if (gecko) { updateDisplaySimple(cm) }
+  startWorker(cm, 100)
+}
+// Sync scroller and scrollbar, ensure the gutter elements are
+// aligned.
+function setScrollLeft(cm, val, isScroller) {
+  if (isScroller ? val == cm.doc.scrollLeft : Math.abs(cm.doc.scrollLeft - val) < 2) { return }
+  val = Math.min(val, cm.display.scroller.scrollWidth - cm.display.scroller.clientWidth)
+  cm.doc.scrollLeft = val
+  alignHorizontally(cm)
+  if (cm.display.scroller.scrollLeft != val) { cm.display.scroller.scrollLeft = val }
+  cm.display.scrollbars.setScrollLeft(val)
+}
+
+// Since the delta values reported on mouse wheel events are
+// unstandardized between browsers and even browser versions, and
+// generally horribly unpredictable, this code starts by measuring
+// the scroll effect that the first few mouse wheel events have,
+// and, from that, detects the way it can convert deltas to pixel
+// offsets afterwards.
+//
+// The reason we want to know the amount a wheel event will scroll
+// is that it gives us a chance to update the display before the
+// actual scrolling happens, reducing flickering.
+
+var wheelSamples = 0;
+var wheelPixelsPerUnit = null;
+// Fill in a browser-detected starting value on browsers where we
+// know one. These don't have to be accurate -- the result of them
+// being wrong would just be a slight flicker on the first wheel
+// scroll (if it is large enough).
+if (ie) { wheelPixelsPerUnit = -.53 }
+else if (gecko) { wheelPixelsPerUnit = 15 }
+else if (chrome) { wheelPixelsPerUnit = -.7 }
+else if (safari) { wheelPixelsPerUnit = -1/3 }
+
+function wheelEventDelta(e) {
+  var dx = e.wheelDeltaX, dy = e.wheelDeltaY
+  if (dx == null && e.detail && e.axis == e.HORIZONTAL_AXIS) { dx = e.detail }
+  if (dy == null && e.detail && e.axis == e.VERTICAL_AXIS) { dy = e.detail }
+  else if (dy == null) { dy = e.wheelDelta }
+  return {x: dx, y: dy}
+}
+function wheelEventPixels(e) {
+  var delta = wheelEventDelta(e)
+  delta.x *= wheelPixelsPerUnit
+  delta.y *= wheelPixelsPerUnit
+  return delta
+}
+
+function onScrollWheel(cm, e) {
+  var delta = wheelEventDelta(e), dx = delta.x, dy = delta.y
+
+  var display = cm.display, scroll = display.scroller
+  // Quit if there's nothing to scroll here
+  var canScrollX = scroll.scrollWidth > scroll.clientWidth
+  var canScrollY = scroll.scrollHeight > scroll.clientHeight
+  if (!(dx && canScrollX || dy && canScrollY)) { return }
+
+  // Webkit browsers on OS X abort momentum scrolls when the target
+  // of the scroll event is removed from the scrollable element.
+  // This hack (see related code in patchDisplay) makes sure the
+  // element is kept around.
+  if (dy && mac && webkit) {
+    outer: for (var cur = e.target, view = display.view; cur != scroll; cur = cur.parentNode) {
+      for (var i = 0; i < view.length; i++) {
+        if (view[i].node == cur) {
+          cm.display.currentWheelTarget = cur
+          break outer
+        }
+      }
+    }
+  }
+
+  // On some browsers, horizontal scrolling will cause redraws to
+  // happen before the gutter has been realigned, causing it to
+  // wriggle around in a most unseemly way. When we have an
+  // estimated pixels/delta value, we just handle horizontal
+  // scrolling entirely here. It'll be slightly off from native, but
+  // better than glitching out.
+  if (dx && !gecko && !presto && wheelPixelsPerUnit != null) {
+    if (dy && canScrollY)
+      { setScrollTop(cm, Math.max(0, Math.min(scroll.scrollTop + dy * wheelPixelsPerUnit, scroll.scrollHeight - scroll.clientHeight))) }
+    setScrollLeft(cm, Math.max(0, Math.min(scroll.scrollLeft + dx * wheelPixelsPerUnit, scroll.scrollWidth - scroll.clientWidth)))
+    // Only prevent default scrolling if vertical scrolling is
+    // actually possible. Otherwise, it causes vertical scroll
+    // jitter on OSX trackpads when deltaX is small and deltaY
+    // is large (issue #3579)
+    if (!dy || (dy && canScrollY))
+      { e_preventDefault(e) }
+    display.wheelStartX = null // Abort measurement, if in progress
+    return
+  }
+
+  // 'Project' the visible viewport to cover the area that is being
+  // scrolled into view (if we know enough to estimate it).
+  if (dy && wheelPixelsPerUnit != null) {
+    var pixels = dy * wheelPixelsPerUnit
+    var top = cm.doc.scrollTop, bot = top + display.wrapper.clientHeight
+    if (pixels < 0) { top = Math.max(0, top + pixels - 50) }
+    else { bot = Math.min(cm.doc.height, bot + pixels + 50) }
+    updateDisplaySimple(cm, {top: top, bottom: bot})
+  }
+
+  if (wheelSamples < 20) {
+    if (display.wheelStartX == null) {
+      display.wheelStartX = scroll.scrollLeft; display.wheelStartY = scroll.scrollTop
+      display.wheelDX = dx; display.wheelDY = dy
+      setTimeout(function () {
+        if (display.wheelStartX == null) { return }
+        var movedX = scroll.scrollLeft - display.wheelStartX
+        var movedY = scroll.scrollTop - display.wheelStartY
+        var sample = (movedY && display.wheelDY && movedY / display.wheelDY) ||
+          (movedX && display.wheelDX && movedX / display.wheelDX)
+        display.wheelStartX = display.wheelStartY = null
+        if (!sample) { return }
+        wheelPixelsPerUnit = (wheelPixelsPerUnit * wheelSamples + sample) / (wheelSamples + 1)
+        ++wheelSamples
+      }, 200)
+    } else {
+      display.wheelDX += dx; display.wheelDY += dy
+    }
+  }
+}
+
+// SCROLLBARS
+
+// Prepare DOM reads needed to update the scrollbars. Done in one
+// shot to minimize update/measure roundtrips.
+function measureForScrollbars(cm) {
+  var d = cm.display, gutterW = d.gutters.offsetWidth
+  var docH = Math.round(cm.doc.height + paddingVert(cm.display))
+  return {
+    clientHeight: d.scroller.clientHeight,
+    viewHeight: d.wrapper.clientHeight,
+    scrollWidth: d.scroller.scrollWidth, clientWidth: d.scroller.clientWidth,
+    viewWidth: d.wrapper.clientWidth,
+    barLeft: cm.options.fixedGutter ? gutterW : 0,
+    docHeight: docH,
+    scrollHeight: docH + scrollGap(cm) + d.barHeight,
+    nativeBarWidth: d.nativeBarWidth,
+    gutterWidth: gutterW
+  }
+}
+
+var NativeScrollbars = function(place, scroll, cm) {
+  this.cm = cm
+  var vert = this.vert = elt("div", [elt("div", null, null, "min-width: 1px")], "CodeMirror-vscrollbar")
+  var horiz = this.horiz = elt("div", [elt("div", null, null, "height: 100%; min-height: 1px")], "CodeMirror-hscrollbar")
+  place(vert); place(horiz)
+
+  on(vert, "scroll", function () {
+    if (vert.clientHeight) { scroll(vert.scrollTop, "vertical") }
+  })
+  on(horiz, "scroll", function () {
+    if (horiz.clientWidth) { scroll(horiz.scrollLeft, "horizontal") }
+  })
+
+  this.checkedZeroWidth = false
+  // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
+  if (ie && ie_version < 8) { this.horiz.style.minHeight = this.vert.style.minWidth = "18px" }
+};
+
+NativeScrollbars.prototype.update = function (measure) {
+  var needsH = measure.scrollWidth > measure.clientWidth + 1
+  var needsV = measure.scrollHeight > measure.clientHeight + 1
+  var sWidth = measure.nativeBarWidth
+
+  if (needsV) {
+    this.vert.style.display = "block"
+    this.vert.style.bottom = needsH ? sWidth + "px" : "0"
+    var totalHeight = measure.viewHeight - (needsH ? sWidth : 0)
+    // A bug in IE8 can cause this value to be negative, so guard it.
+    this.vert.firstChild.style.height =
+      Math.max(0, measure.scrollHeight - measure.clientHeight + totalHeight) + "px"
+  } else {
+    this.vert.style.display = ""
+    this.vert.firstChild.style.height = "0"
+  }
+
+  if (needsH) {
+    this.horiz.style.display = "block"
+    this.horiz.style.right = needsV ? sWidth + "px" : "0"
+    this.horiz.style.left = measure.barLeft + "px"
+    var totalWidth = measure.viewWidth - measure.barLeft - (needsV ? sWidth : 0)
+    this.horiz.firstChild.style.width =
+      Math.max(0, measure.scrollWidth - measure.clientWidth + totalWidth) + "px"
+  } else {
+    this.horiz.style.display = ""
+    this.horiz.firstChild.style.width = "0"
+  }
+
+  if (!this.checkedZeroWidth && measure.clientHeight > 0) {
+    if (sWidth == 0) { this.zeroWidthHack() }
+    this.checkedZeroWidth = true
+  }
+
+  return {right: needsV ? sWidth : 0, bottom: needsH ? sWidth : 0}
+};
+
+NativeScrollbars.prototype.setScrollLeft = function (pos) {
+  if (this.horiz.scrollLeft != pos) { this.horiz.scrollLeft = pos }
+  if (this.disableHoriz) { this.enableZeroWidthBar(this.horiz, this.disableHoriz, "horiz") }
+};
+
+NativeScrollbars.prototype.setScrollTop = function (pos) {
+  if (this.vert.scrollTop != pos) { this.vert.scrollTop = pos }
+  if (this.disableVert) { this.enableZeroWidthBar(this.vert, this.disableVert, "vert") }
+};
+
+NativeScrollbars.prototype.zeroWidthHack = function () {
+  var w = mac && !mac_geMountainLion ? "12px" : "18px"
+  this.horiz.style.height = this.vert.style.width = w
+  this.horiz.style.pointerEvents = this.vert.style.pointerEvents = "none"
+  this.disableHoriz = new Delayed
+  this.disableVert = new Delayed
+};
+
+NativeScrollbars.prototype.enableZeroWidthBar = function (bar, delay, type) {
+  bar.style.pointerEvents = "auto"
+  function maybeDisable() {
+    // To find out whether the scrollbar is still visible, we
+    // check whether the element under the pixel in the bottom
+    // right corner of the scrollbar box is the scrollbar box
+    // itself (when the bar is still visible) or its filler child
+    // (when the bar is hidden). If it is still visible, we keep
+    // it enabled, if it's hidden, we disable pointer events.
+    var box = bar.getBoundingClientRect()
+    var elt = type == "vert" ? document.elementFromPoint(box.right - 1, (box.top + box.bottom) / 2)
+        : document.elementFromPoint((box.right + box.left) / 2, box.bottom - 1)
+    if (elt != bar) { bar.style.pointerEvents = "none" }
+    else { delay.set(1000, maybeDisable) }
+  }
+  delay.set(1000, maybeDisable)
+};
+
+NativeScrollbars.prototype.clear = function () {
+  var parent = this.horiz.parentNode
+  parent.removeChild(this.horiz)
+  parent.removeChild(this.vert)
+};
+
+var NullScrollbars = function () {};
+
+NullScrollbars.prototype.update = function () { return {bottom: 0, right: 0} };
+NullScrollbars.prototype.setScrollLeft = function () {};
+NullScrollbars.prototype.setScrollTop = function () {};
+NullScrollbars.prototype.clear = function () {};
+
+function updateScrollbars(cm, measure) {
+  if (!measure) { measure = measureForScrollbars(cm) }
+  var startWidth = cm.display.barWidth, startHeight = cm.display.barHeight
+  updateScrollbarsInner(cm, measure)
+  for (var i = 0; i < 4 && startWidth != cm.display.barWidth || startHeight != cm.display.barHeight; i++) {
+    if (startWidth != cm.display.barWidth && cm.options.lineWrapping)
+      { updateHeightsInViewport(cm) }
+    updateScrollbarsInner(cm, measureForScrollbars(cm))
+    startWidth = cm.display.barWidth; startHeight = cm.display.barHeight
+  }
+}
+
+// Re-synchronize the fake scrollbars with the actual size of the
+// content.
+function updateScrollbarsInner(cm, measure) {
+  var d = cm.display
+  var sizes = d.scrollbars.update(measure)
+
+  d.sizer.style.paddingRight = (d.barWidth = sizes.right) + "px"
+  d.sizer.style.paddingBottom = (d.barHeight = sizes.bottom) + "px"
+  d.heightForcer.style.borderBottom = sizes.bottom + "px solid transparent"
+
+  if (sizes.right && sizes.bottom) {
+    d.scrollbarFiller.style.display = "block"
+    d.scrollbarFiller.style.height = sizes.bottom + "px"
+    d.scrollbarFiller.style.width = sizes.right + "px"
+  } else { d.scrollbarFiller.style.display = "" }
+  if (sizes.bottom && cm.options.coverGutterNextToScrollbar && cm.options.fixedGutter) {
+    d.gutterFiller.style.display = "block"
+    d.gutterFiller.style.height = sizes.bottom + "px"
+    d.gutterFiller.style.width = measure.gutterWidth + "px"
+  } else { d.gutterFiller.style.display = "" }
+}
+
+var scrollbarModel = {"native": NativeScrollbars, "null": NullScrollbars}
+
+function initScrollbars(cm) {
+  if (cm.display.scrollbars) {
+    cm.display.scrollbars.clear()
+    if (cm.display.scrollbars.addClass)
+      { rmClass(cm.display.wrapper, cm.display.scrollbars.addClass) }
+  }
+
+  cm.display.scrollbars = new scrollbarModel[cm.options.scrollbarStyle](function (node) {
+    cm.display.wrapper.insertBefore(node, cm.display.scrollbarFiller)
+    // Prevent clicks in the scrollbars from killing focus
+    on(node, "mousedown", function () {
+      if (cm.state.focused) { setTimeout(function () { return cm.display.input.focus(); }, 0) }
+    })
+    node.setAttribute("cm-not-content", "true")
+  }, function (pos, axis) {
+    if (axis == "horizontal") { setScrollLeft(cm, pos) }
+    else { setScrollTop(cm, pos) }
+  }, cm)
+  if (cm.display.scrollbars.addClass)
+    { addClass(cm.display.wrapper, cm.display.scrollbars.addClass) }
+}
+
+// SCROLLING THINGS INTO VIEW
+
+// If an editor sits on the top or bottom of the window, partially
+// scrolled out of view, this ensures that the cursor is visible.
+function maybeScrollWindow(cm, rect) {
+  if (signalDOMEvent(cm, "scrollCursorIntoView")) { return }
+
+  var display = cm.display, box = display.sizer.getBoundingClientRect(), doScroll = null
+  if (rect.top + box.top < 0) { doScroll = true }
+  else if (rect.bottom + box.top > (window.innerHeight || document.documentElement.clientHeight)) { doScroll = false }
+  if (doScroll != null && !phantom) {
+    var scrollNode = elt("div", "\u200b", null, ("position: absolute;\n                         top: " + (rect.top - display.viewOffset - paddingTop(cm.display)) + "px;\n                         height: " + (rect.bottom - rect.top + scrollGap(cm) + display.barHeight) + "px;\n                         left: " + (rect.left) + "px; width: " + (Math.max(2, rect.right - rect.left)) + "px;"))
+    cm.display.lineSpace.appendChild(scrollNode)
+    scrollNode.scrollIntoView(doScroll)
+    cm.display.lineSpace.removeChild(scrollNode)
+  }
+}
+
+// Scroll a given position into view (immediately), verifying that
+// it actually became visible (as line heights are accurately
+// measured, the position of something may 'drift' during drawing).
+function scrollPosIntoView(cm, pos, end, margin) {
+  if (margin == null) { margin = 0 }
+  var rect
+  for (var limit = 0; limit < 5; limit++) {
+    var changed = false
+    var coords = cursorCoords(cm, pos)
+    var endCoords = !end || end == pos ? coords : cursorCoords(cm, end)
+    rect = {left: Math.min(coords.left, endCoords.left),
+            top: Math.min(coords.top, endCoords.top) - margin,
+            right: Math.max(coords.left, endCoords.left),
+            bottom: Math.max(coords.bottom, endCoords.bottom) + margin}
+    var scrollPos = calculateScrollPos(cm, rect)
+    var startTop = cm.doc.scrollTop, startLeft = cm.doc.scrollLeft
+    if (scrollPos.scrollTop != null) {
+      setScrollTop(cm, scrollPos.scrollTop)
+      if (Math.abs(cm.doc.scrollTop - startTop) > 1) { changed = true }
+    }
+    if (scrollPos.scrollLeft != null) {
+      setScrollLeft(cm, scrollPos.scrollLeft)
+      if (Math.abs(cm.doc.scrollLeft - startLeft) > 1) { changed = true }
+    }
+    if (!changed) { break }
+  }
+  return rect
+}
+
+// Scroll a given set of coordinates into view (immediately).
+function scrollIntoView(cm, rect) {
+  var scrollPos = calculateScrollPos(cm, rect)
+  if (scrollPos.scrollTop != null) { setScrollTop(cm, scrollPos.scrollTop) }
+  if (scrollPos.scrollLeft != null) { setScrollLeft(cm, scrollPos.scrollLeft) }
+}
+
+// Calculate a new scroll position needed to scroll the given
+// rectangle into view. Returns an object with scrollTop and
+// scrollLeft properties. When these are undefined, the
+// vertical/horizontal position does not need to be adjusted.
+function calculateScrollPos(cm, rect) {
+  var display = cm.display, snapMargin = textHeight(cm.display)
+  if (rect.top < 0) { rect.top = 0 }
+  var screentop = cm.curOp && cm.curOp.scrollTop != null ? cm.curOp.scrollTop : display.scroller.scrollTop
+  var screen = displayHeight(cm), result = {}
+  if (rect.bottom - rect.top > screen) { rect.bottom = rect.top + screen }
+  var docBottom = cm.doc.height + paddingVert(display)
+  var atTop = rect.top < snapMargin, atBottom = rect.bottom > docBottom - snapMargin
+  if (rect.top < screentop) {
+    result.scrollTop = atTop ? 0 : rect.top
+  } else if (rect.bottom > screentop + screen) {
+    var newTop = Math.min(rect.top, (atBottom ? docBottom : rect.bottom) - screen)
+    if (newTop != screentop) { result.scrollTop = newTop }
+  }
+
+  var screenleft = cm.curOp && cm.curOp.scrollLeft != null ? cm.curOp.scrollLeft : display.scroller.scrollLeft
+  var screenw = displayWidth(cm) - (cm.options.fixedGutter ? display.gutters.offsetWidth : 0)
+  var tooWide = rect.right - rect.left > screenw
+  if (tooWide) { rect.right = rect.left + screenw }
+  if (rect.left < 10)
+    { result.scrollLeft = 0 }
+  else if (rect.left < screenleft)
+    { result.scrollLeft = Math.max(0, rect.left - (tooWide ? 0 : 10)) }
+  else if (rect.right > screenw + screenleft - 3)
+    { result.scrollLeft = rect.right + (tooWide ? 0 : 10) - screenw }
+  return result
+}
+
+// Store a relative adjustment to the scroll position in the current
+// operation (to be applied when the operation finishes).
+function addToScrollPos(cm, left, top) {
+  if (left != null || top != null) { resolveScrollToPos(cm) }
+  if (left != null)
+    { cm.curOp.scrollLeft = (cm.curOp.scrollLeft == null ? cm.doc.scrollLeft : cm.curOp.scrollLeft) + left }
+  if (top != null)
+    { cm.curOp.scrollTop = (cm.curOp.scrollTop == null ? cm.doc.scrollTop : cm.curOp.scrollTop) + top }
+}
+
+// Make sure that at the end of the operation the current cursor is
+// shown.
+function ensureCursorVisible(cm) {
+  resolveScrollToPos(cm)
+  var cur = cm.getCursor(), from = cur, to = cur
+  if (!cm.options.lineWrapping) {
+    from = cur.ch ? Pos(cur.line, cur.ch - 1) : cur
+    to = Pos(cur.line, cur.ch + 1)
+  }
+  cm.curOp.scrollToPos = {from: from, to: to, margin: cm.options.cursorScrollMargin}
+}
+
+// When an operation has its scrollToPos property set, and another
+// scroll action is applied before the end of the operation, this
+// 'simulates' scrolling that position into view in a cheap way, so
+// that the effect of intermediate scroll commands is not ignored.
+function resolveScrollToPos(cm) {
+  var range = cm.curOp.scrollToPos
+  if (range) {
+    cm.curOp.scrollToPos = null
+    var from = estimateCoords(cm, range.from), to = estimateCoords(cm, range.to)
+    var sPos = calculateScrollPos(cm, {
+      left: Math.min(from.left, to.left),
+      top: Math.min(from.top, to.top) - range.margin,
+      right: Math.max(from.right, to.right),
+      bottom: Math.max(from.bottom, to.bottom) + range.margin
+    })
+    cm.scrollTo(sPos.scrollLeft, sPos.scrollTop)
+  }
+}
+
+// Operations are used to wrap a series of changes to the editor
+// state in such a way that each change won't have to update the
+// cursor and display (which would be awkward, slow, and
+// error-prone). Instead, display updates are batched and then all
+// combined and executed at once.
+
+var nextOpId = 0
+// Start a new operation.
+function startOperation(cm) {
+  cm.curOp = {
+    cm: cm,
+    viewChanged: false,      // Flag that indicates that lines might need to be redrawn
+    startHeight: cm.doc.height, // Used to detect need to update scrollbar
+    forceUpdate: false,      // Used to force a redraw
+    updateInput: null,       // Whether to reset the input textarea
+    typing: false,           // Whether this reset should be careful to leave existing text (for compositing)
+    changeObjs: null,        // Accumulated changes, for firing change events
+    cursorActivityHandlers: null, // Set of handlers to fire cursorActivity on
+    cursorActivityCalled: 0, // Tracks which cursorActivity handlers have been called already
+    selectionChanged: false, // Whether the selection needs to be redrawn
+    updateMaxLine: false,    // Set when the widest line needs to be determined anew
+    scrollLeft: null, scrollTop: null, // Intermediate scroll position, not pushed to DOM yet
+    scrollToPos: null,       // Used to scroll to a specific position
+    focus: false,
+    id: ++nextOpId           // Unique ID
+  }
+  pushOperation(cm.curOp)
+}
+
+// Finish an operation, updating the display and signalling delayed events
+function endOperation(cm) {
+  var op = cm.curOp
+  finishOperation(op, function (group) {
+    for (var i = 0; i < group.ops.length; i++)
+      { group.ops[i].cm.curOp = null }
+    endOperations(group)
+  })
+}
+
+// The DOM updates done when an operation finishes are batched so
+// that the minimum number of relayouts are required.
+function endOperations(group) {
+  var ops = group.ops
+  for (var i = 0; i < ops.length; i++) // Read DOM
+    { endOperation_R1(ops[i]) }
+  for (var i$1 = 0; i$1 < ops.length; i$1++) // Write DOM (maybe)
+    { endOperation_W1(ops[i$1]) }
+  for (var i$2 = 0; i$2 < ops.length; i$2++) // Read DOM
+    { endOperation_R2(ops[i$2]) }
+  for (var i$3 = 0; i$3 < ops.length; i$3++) // Write DOM (maybe)
+    { endOperation_W2(ops[i$3]) }
+  for (var i$4 = 0; i$4 < ops.length; i$4++) // Read DOM
+    { endOperation_finish(ops[i$4]) }
+}
+
+function endOperation_R1(op) {
+  var cm = op.cm, display = cm.display
+  maybeClipScrollbars(cm)
+  if (op.updateMaxLine) { findMaxLine(cm) }
+
+  op.mustUpdate = op.viewChanged || op.forceUpdate || op.scrollTop != null ||
+    op.scrollToPos && (op.scrollToPos.from.line < display.viewFrom ||
+                       op.scrollToPos.to.line >= display.viewTo) ||
+    display.maxLineChanged && cm.options.lineWrapping
+  op.update = op.mustUpdate &&
+    new DisplayUpdate(cm, op.mustUpdate && {top: op.scrollTop, ensure: op.scrollToPos}, op.forceUpdate)
+}
+
+function endOperation_W1(op) {
+  op.updatedDisplay = op.mustUpdate && updateDisplayIfNeeded(op.cm, op.update)
+}
+
+function endOperation_R2(op) {
+  var cm = op.cm, display = cm.display
+  if (op.updatedDisplay) { updateHeightsInViewport(cm) }
+
+  op.barMeasure = measureForScrollbars(cm)
+
+  // If the max line changed since it was last measured, measure it,
+  // and ensure the document's width matches it.
+  // updateDisplay_W2 will use these properties to do the actual resizing
+  if (display.maxLineChanged && !cm.options.lineWrapping) {
+    op.adjustWidthTo = measureChar(cm, display.maxLine, display.maxLine.text.length).left + 3
+    cm.display.sizerWidth = op.adjustWidthTo
+    op.barMeasure.scrollWidth =
+      Math.max(display.scroller.clientWidth, display.sizer.offsetLeft + op.adjustWidthTo + scrollGap(cm) + cm.display.barWidth)
+    op.maxScrollLeft = Math.max(0, display.sizer.offsetLeft + op.adjustWidthTo - displayWidth(cm))
+  }
+
+  if (op.updatedDisplay || op.selectionChanged)
+    { op.preparedSelection = display.input.prepareSelection(op.focus) }
+}
+
+function endOperation_W2(op) {
+  var cm = op.cm
+
+  if (op.adjustWidthTo != null) {
+    cm.display.sizer.style.minWidth = op.adjustWidthTo + "px"
+    if (op.maxScrollLeft < cm.doc.scrollLeft)
+      { setScrollLeft(cm, Math.min(cm.display.scroller.scrollLeft, op.maxScrollLeft), true) }
+    cm.display.maxLineChanged = false
+  }
+
+  var takeFocus = op.focus && op.focus == activeElt() && (!document.hasFocus || document.hasFocus())
+  if (op.preparedSelection)
+    { cm.display.input.showSelection(op.preparedSelection, takeFocus) }
+  if (op.updatedDisplay || op.startHeight != cm.doc.height)
+    { updateScrollbars(cm, op.barMeasure) }
+  if (op.updatedDisplay)
+    { setDocumentHeight(cm, op.barMeasure) }
+
+  if (op.selectionChanged) { restartBlink(cm) }
+
+  if (cm.state.focused && op.updateInput)
+    { cm.display.input.reset(op.typing) }
+  if (takeFocus) { ensureFocus(op.cm) }
+}
+
+function endOperation_finish(op) {
+  var cm = op.cm, display = cm.display, doc = cm.doc
+
+  if (op.updatedDisplay) { postUpdateDisplay(cm, op.update) }
+
+  // Abort mouse wheel delta measurement, when scrolling explicitly
+  if (display.wheelStartX != null && (op.scrollTop != null || op.scrollLeft != null || op.scrollToPos))
+    { display.wheelStartX = display.wheelStartY = null }
+
+  // Propagate the scroll position to the actual DOM scroller
+  if (op.scrollTop != null && (display.scroller.scrollTop != op.scrollTop || op.forceScroll)) {
+    doc.scrollTop = Math.max(0, Math.min(display.scroller.scrollHeight - display.scroller.clientHeight, op.scrollTop))
+    display.scrollbars.setScrollTop(doc.scrollTop)
+    display.scroller.scrollTop = doc.scrollTop
+  }
+  if (op.scrollLeft != null && (display.scroller.scrollLeft != op.scrollLeft || op.forceScroll)) {
+    doc.scrollLeft = Math.max(0, Math.min(display.scroller.scrollWidth - display.scroller.clientWidth, op.scrollLeft))
+    display.scrollbars.setScrollLeft(doc.scrollLeft)
+    display.scroller.scrollLeft = doc.scrollLeft
+    alignHorizontally(cm)
+  }
+  // If we need to scroll a specific position into view, do so.
+  if (op.scrollToPos) {
+    var rect = scrollPosIntoView(cm, clipPos(doc, op.scrollToPos.from),
+                                 clipPos(doc, op.scrollToPos.to), op.scrollToPos.margin)
+    maybeScrollWindow(cm, rect)
+  }
+
+  // Fire events for markers that are hidden/unidden by editing or
+  // undoing
+  var hidden = op.maybeHiddenMarkers, unhidden = op.maybeUnhiddenMarkers
+  if (hidden) { for (var i = 0; i < hidden.length; ++i)
+    { if (!hidden[i].lines.length) { signal(hidden[i], "hide") } } }
+  if (unhidden) { for (var i$1 = 0; i$1 < unhidden.length; ++i$1)
+    { if (unhidden[i$1].lines.length) { signal(unhidden[i$1], "unhide") } } }
+
+  if (display.wrapper.offsetHeight)
+    { doc.scrollTop = cm.display.scroller.scrollTop }
+
+  // Fire change events, and delayed event handlers
+  if (op.changeObjs)
+    { signal(cm, "changes", cm, op.changeObjs) }
+  if (op.update)
+    { op.update.finish() }
+}
+
+// Run the given function in an operation
+function runInOp(cm, f) {
+  if (cm.curOp) { return f() }
+  startOperation(cm)
+  try { return f() }
+  finally { endOperation(cm) }
+}
+// Wraps a function in an operation. Returns the wrapped function.
+function operation(cm, f) {
+  return function() {
+    if (cm.curOp) { return f.apply(cm, arguments) }
+    startOperation(cm)
+    try { return f.apply(cm, arguments) }
+    finally { endOperation(cm) }
+  }
+}
+// Used to add methods to editor and doc instances, wrapping them in
+// operations.
+function methodOp(f) {
+  return function() {
+    if (this.curOp) { return f.apply(this, arguments) }
+    startOperation(this)
+    try { return f.apply(this, arguments) }
+    finally { endOperation(this) }
+  }
+}
+function docMethodOp(f) {
+  return function() {
+    var cm = this.cm
+    if (!cm || cm.curOp) { return f.apply(this, arguments) }
+    startOperation(cm)
+    try { return f.apply(this, arguments) }
+    finally { endOperation(cm) }
+  }
+}
+
+// Updates the display.view data structure for a given change to the
+// document. From and to are in pre-change coordinates. Lendiff is
+// the amount of lines added or subtracted by the change. This is
+// used for changes that span multiple lines, or change the way
+// lines are divided into visual lines. regLineChange (below)
+// registers single-line changes.
+function regChange(cm, from, to, lendiff) {
+  if (from == null) { from = cm.doc.first }
+  if (to == null) { to = cm.doc.first + cm.doc.size }
+  if (!lendiff) { lendiff = 0 }
+
+  var display = cm.display
+  if (lendiff && to < display.viewTo &&
+      (display.updateLineNumbers == null || display.updateLineNumbers > from))
+    { display.updateLineNumbers = from }
+
+  cm.curOp.viewChanged = true
+
+  if (from >= display.viewTo) { // Change after
+    if (sawCollapsedSpans && visualLineNo(cm.doc, from) < display.viewTo)
+      { resetView(cm) }
+  } else if (to <= display.viewFrom) { // Change before
+    if (sawCollapsedSpans && visualLineEndNo(cm.doc, to + lendiff) > display.viewFrom) {
+      resetView(cm)
+    } else {
+      display.viewFrom += lendiff
+      display.viewTo += lendiff
+    }
+  } else if (from <= display.viewFrom && to >= display.viewTo) { // Full overlap
+    resetView(cm)
+  } else if (from <= display.viewFrom) { // Top overlap
+    var cut = viewCuttingPoint(cm, to, to + lendiff, 1)
+    if (cut) {
+      display.view = display.view.slice(cut.index)
+      display.viewFrom = cut.lineN
+      display.viewTo += lendiff
+    } else {
+      resetView(cm)
+    }
+  } else if (to >= display.viewTo) { // Bottom overlap
+    var cut$1 = viewCuttingPoint(cm, from, from, -1)
+    if (cut$1) {
+      display.view = display.view.slice(0, cut$1.index)
+      display.viewTo = cut$1.lineN
+    } else {
+      resetView(cm)
+    }
+  } else { // Gap in the middle
+    var cutTop = viewCuttingPoint(cm, from, from, -1)
+    var cutBot = viewCuttingPoint(cm, to, to + lendiff, 1)
+    if (cutTop && cutBot) {
+      display.view = display.view.slice(0, cutTop.index)
+        .concat(buildViewArray(cm, cutTop.lineN, cutBot.lineN))
+        .concat(display.view.slice(cutBot.index))
+      display.viewTo += lendiff
+    } else {
+      resetView(cm)
+    }
+  }
+
+  var ext = display.externalMeasured
+  if (ext) {
+    if (to < ext.lineN)
+      { ext.lineN += lendiff }
+    else if (from < ext.lineN + ext.size)
+      { display.externalMeasured = null }
+  }
+}
+
+// Register a change to a single line. Type must be one of "text",
+// "gutter", "class", "widget"
+function regLineChange(cm, line, type) {
+  cm.curOp.viewChanged = true
+  var display = cm.display, ext = cm.display.externalMeasured
+  if (ext && line >= ext.lineN && line < ext.lineN + ext.size)
+    { display.externalMeasured = null }
+
+  if (line < display.viewFrom || line >= display.viewTo) { return }
+  var lineView = display.view[findViewIndex(cm, line)]
+  if (lineView.node == null) { return }
+  var arr = lineView.changes || (lineView.changes = [])
+  if (indexOf(arr, type) == -1) { arr.push(type) }
+}
+
+// Clear the view.
+function resetView(cm) {
+  cm.display.viewFrom = cm.display.viewTo = cm.doc.first
+  cm.display.view = []
+  cm.display.viewOffset = 0
+}
+
+function viewCuttingPoint(cm, oldN, newN, dir) {
+  var index = findViewIndex(cm, oldN), diff, view = cm.display.view
+  if (!sawCollapsedSpans || newN == cm.doc.first + cm.doc.size)
+    { return {index: index, lineN: newN} }
+  var n = cm.display.viewFrom
+  for (var i = 0; i < index; i++)
+    { n += view[i].size }
+  if (n != oldN) {
+    if (dir > 0) {
+      if (index == view.length - 1) { return null }
+      diff = (n + view[index].size) - oldN
+      index++
+    } else {
+      diff = n - oldN
+    }
+    oldN += diff; newN += diff
+  }
+  while (visualLineNo(cm.doc, newN) != newN) {
+    if (index == (dir < 0 ? 0 : view.length - 1)) { return null }
+    newN += dir * view[index - (dir < 0 ? 1 : 0)].size
+    index += dir
+  }
+  return {index: index, lineN: newN}
+}
+
+// Force the view to cover a given range, adding empty view element
+// or clipping off existing ones as needed.
+function adjustView(cm, from, to) {
+  var display = cm.display, view = display.view
+  if (view.length == 0 || from >= display.viewTo || to <= display.viewFrom) {
+    display.view = buildViewArray(cm, from, to)
+    display.viewFrom = from
+  } else {
+    if (display.viewFrom > from)
+      { display.view = buildViewArray(cm, from, display.viewFrom).concat(display.view) }
+    else if (display.viewFrom < from)
+      { display.view = display.view.slice(findViewIndex(cm, from)) }
+    display.viewFrom = from
+    if (display.viewTo < to)
+      { display.view = display.view.concat(buildViewArray(cm, display.viewTo, to)) }
+    else if (display.viewTo > to)
+      { display.view = display.view.slice(0, findViewIndex(cm, to)) }
+  }
+  display.viewTo = to
+}
+
+// Count the number of lines in the view whose DOM representation is
+// out of date (or nonexistent).
+function countDirtyView(cm) {
+  var view = cm.display.view, dirty = 0
+  for (var i = 0; i < view.length; i++) {
+    var lineView = view[i]
+    if (!lineView.hidden && (!lineView.node || lineView.changes)) { ++dirty }
+  }
+  return dirty
+}
+
+// HIGHLIGHT WORKER
+
+function startWorker(cm, time) {
+  if (cm.doc.mode.startState && cm.doc.frontier < cm.display.viewTo)
+    { cm.state.highlight.set(time, bind(highlightWorker, cm)) }
+}
+
+function highlightWorker(cm) {
+  var doc = cm.doc
+  if (doc.frontier < doc.first) { doc.frontier = doc.first }
+  if (doc.frontier >= cm.display.viewTo) { return }
+  var end = +new Date + cm.options.workTime
+  var state = copyState(doc.mode, getStateBefore(cm, doc.frontier))
+  var changedLines = []
+
+  doc.iter(doc.frontier, Math.min(doc.first + doc.size, cm.display.viewTo + 500), function (line) {
+    if (doc.frontier >= cm.display.viewFrom) { // Visible
+      var oldStyles = line.styles, tooLong = line.text.length > cm.options.maxHighlightLength
+      var highlighted = highlightLine(cm, line, tooLong ? copyState(doc.mode, state) : state, true)
+      line.styles = highlighted.styles
+      var oldCls = line.styleClasses, newCls = highlighted.classes
+      if (newCls) { line.styleClasses = newCls }
+      else if (oldCls) { line.styleClasses = null }
+      var ischange = !oldStyles || oldStyles.length != line.styles.length ||
+        oldCls != newCls && (!oldCls || !newCls || oldCls.bgClass != newCls.bgClass || oldCls.textClass != newCls.textClass)
+      for (var i = 0; !ischange && i < oldStyles.length; ++i) { ischange = oldStyles[i] != line.styles[i] }
+      if (ischange) { changedLines.push(doc.frontier) }
+      line.stateAfter = tooLong ? state : copyState(doc.mode, state)
+    } else {
+      if (line.text.length <= cm.options.maxHighlightLength)
+        { processLine(cm, line.text, state) }
+      line.stateAfter = doc.frontier % 5 == 0 ? copyState(doc.mode, state) : null
+    }
+    ++doc.frontier
+    if (+new Date > end) {
+      startWorker(cm, cm.options.workDelay)
+      return true
+    }
+  })
+  if (changedLines.length) { runInOp(cm, function () {
+    for (var i = 0; i < changedLines.length; i++)
+      { regLineChange(cm, changedLines[i], "text") }
+  }) }
+}
+
+// DISPLAY DRAWING
+
+var DisplayUpdate = function(cm, viewport, force) {
+  var display = cm.display
+
+  this.viewport = viewport
+  // Store some values that we'll need later (but don't want to force a relayout for)
+  this.visible = visibleLines(display, cm.doc, viewport)
+  this.editorIsHidden = !display.wrapper.offsetWidth
+  this.wrapperHeight = display.wrapper.clientHeight
+  this.wrapperWidth = display.wrapper.clientWidth
+  this.oldDisplayWidth = displayWidth(cm)
+  this.force = force
+  this.dims = getDimensions(cm)
+  this.events = []
+};
+
+DisplayUpdate.prototype.signal = function (emitter, type) {
+  if (hasHandler(emitter, type))
+    { this.events.push(arguments) }
+};
+DisplayUpdate.prototype.finish = function () {
+    var this$1 = this;
+
+  for (var i = 0; i < this.events.length; i++)
+    { signal.apply(null, this$1.events[i]) }
+};
+
+function maybeClipScrollbars(cm) {
+  var display = cm.display
+  if (!display.scrollbarsClipped && display.scroller.offsetWidth) {
+    display.nativeBarWidth = display.scroller.offsetWidth - display.scroller.clientWidth
+    display.heightForcer.style.height = scrollGap(cm) + "px"
+    display.sizer.style.marginBottom = -display.nativeBarWidth + "px"
+    display.sizer.style.borderRightWidth = scrollGap(cm) + "px"
+    display.scrollbarsClipped = true
+  }
+}
+
+// Does the actual updating of the line display. Bails out
+// (returning false) when there is nothing to be done and forced is
+// false.
+function updateDisplayIfNeeded(cm, update) {
+  var display = cm.display, doc = cm.doc
+
+  if (update.editorIsHidden) {
+    resetView(cm)
+    return false
+  }
+
+  // Bail out if the visible area is already rendered and nothing changed.
+  if (!update.force &&
+      update.visible.from >= display.viewFrom && update.visible.to <= display.viewTo &&
+      (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo) &&
+      display.renderedView == display.view && countDirtyView(cm) == 0)
+    { return false }
+
+  if (maybeUpdateLineNumberWidth(cm)) {
+    resetView(cm)
+    update.dims = getDimensions(cm)
+  }
+
+  // Compute a suitable new viewport (from & to)
+  var end = doc.first + doc.size
+  var from = Math.max(update.visible.from - cm.options.viewportMargin, doc.first)
+  var to = Math.min(end, update.visible.to + cm.options.viewportMargin)
+  if (display.viewFrom < from && from - display.viewFrom < 20) { from = Math.max(doc.first, display.viewFrom) }
+  if (display.viewTo > to && display.viewTo - to < 20) { to = Math.min(end, display.viewTo) }
+  if (sawCollapsedSpans) {
+    from = visualLineNo(cm.doc, from)
+    to = visualLineEndNo(cm.doc, to)
+  }
+
+  var different = from != display.viewFrom || to != display.viewTo ||
+    display.lastWrapHeight != update.wrapperHeight || display.lastWrapWidth != update.wrapperWidth
+  adjustView(cm, from, to)
+
+  display.viewOffset = heightAtLine(getLine(cm.doc, display.viewFrom))
+  // Position the mover div to align with the current scroll position
+  cm.display.mover.style.top = display.viewOffset + "px"
+
+  var toUpdate = countDirtyView(cm)
+  if (!different && toUpdate == 0 && !update.force && display.renderedView == display.view &&
+      (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo))
+    { return false }
+
+  // For big changes, we hide the enclosing element during the
+  // update, since that speeds up the operations on most browsers.
+  var focused = activeElt()
+  if (toUpdate > 4) { display.lineDiv.style.display = "none" }
+  patchDisplay(cm, display.updateLineNumbers, update.dims)
+  if (toUpdate > 4) { display.lineDiv.style.display = "" }
+  display.renderedView = display.view
+  // There might have been a widget with a focused element that got
+  // hidden or updated, if so re-focus it.
+  if (focused && activeElt() != focused && focused.offsetHeight) { focused.focus() }
+
+  // Prevent selection and cursors from interfering with the scroll
+  // width and height.
+  removeChildren(display.cursorDiv)
+  removeChildren(display.selectionDiv)
+  display.gutters.style.height = display.sizer.style.minHeight = 0
+
+  if (different) {
+    display.lastWrapHeight = update.wrapperHeight
+    display.lastWrapWidth = update.wrapperWidth
+    startWorker(cm, 400)
+  }
+
+  display.updateLineNumbers = null
+
+  return true
+}
+
+function postUpdateDisplay(cm, update) {
+  var viewport = update.viewport
+
+  for (var first = true;; first = false) {
+    if (!first || !cm.options.lineWrapping || update.oldDisplayWidth == displayWidth(cm)) {
+      // Clip forced viewport to actual scrollable area.
+      if (viewport && viewport.top != null)
+        { viewport = {top: Math.min(cm.doc.height + paddingVert(cm.display) - displayHeight(cm), viewport.top)} }
+      // Updated line heights might result in the drawn area not
+      // actually covering the viewport. Keep looping until it does.
+      update.visible = visibleLines(cm.display, cm.doc, viewport)
+      if (update.visible.from >= cm.display.viewFrom && update.visible.to <= cm.display.viewTo)
+        { break }
+    }
+    if (!updateDisplayIfNeeded(cm, update)) { break }
+    updateHeightsInViewport(cm)
+    var barMeasure = measureForScrollbars(cm)
+    updateSelection(cm)
+    updateScrollbars(cm, barMeasure)
+    setDocumentHeight(cm, barMeasure)
+  }
+
+  update.signal(cm, "update", cm)
+  if (cm.display.viewFrom != cm.display.reportedViewFrom || cm.display.viewTo != cm.display.reportedViewTo) {
+    update.signal(cm, "viewportChange", cm, cm.display.viewFrom, cm.display.viewTo)
+    cm.display.reportedViewFrom = cm.display.viewFrom; cm.display.reportedViewTo = cm.display.viewTo
+  }
+}
+
+function updateDisplaySimple(cm, viewport) {
+  var update = new DisplayUpdate(cm, viewport)
+  if (updateDisplayIfNeeded(cm, update)) {
+    updateHeightsInViewport(cm)
+    postUpdateDisplay(cm, update)
+    var barMeasure = measureForScrollbars(cm)
+    updateSelection(cm)
+    updateScrollbars(cm, barMeasure)
+    setDocumentHeight(cm, barMeasure)
+    update.finish()
+  }
+}
+
+// Sync the actual display DOM structure with display.view, removing
+// nodes for lines that are no longer in view, and creating the ones
+// that are not there yet, and updating the ones that are out of
+// date.
+function patchDisplay(cm, updateNumbersFrom, dims) {
+  var display = cm.display, lineNumbers = cm.options.lineNumbers
+  var container = display.lineDiv, cur = container.firstChild
+
+  function rm(node) {
+    var next = node.nextSibling
+    // Works around a throw-scroll bug in OS X Webkit
+    if (webkit && mac && cm.display.currentWheelTarget == node)
+      { node.style.display = "none" }
+    else
+      { node.parentNode.removeChild(node) }
+    return next
+  }
+
+  var view = display.view, lineN = display.viewFrom
+  // Loop over the elements in the view, syncing cur (the DOM nodes
+  // in display.lineDiv) with the view as we go.
+  for (var i = 0; i < view.length; i++) {
+    var lineView = view[i]
+    if (lineView.hidden) {
+    } else if (!lineView.node || lineView.node.parentNode != container) { // Not drawn yet
+      var node = buildLineElement(cm, lineView, lineN, dims)
+      container.insertBefore(node, cur)
+    } else { // Already drawn
+      while (cur != lineView.node) { cur = rm(cur) }
+      var updateNumber = lineNumbers && updateNumbersFrom != null &&
+        updateNumbersFrom <= lineN && lineView.lineNumber
+      if (lineView.changes) {
+        if (indexOf(lineView.changes, "gutter") > -1) { updateNumber = false }
+        updateLineForChanges(cm, lineView, lineN, dims)
+      }
+      if (updateNumber) {
+        removeChildren(lineView.lineNumber)
+        lineView.lineNumber.appendChild(document.createTextNode(lineNumberFor(cm.options, lineN)))
+      }
+      cur = lineView.node.nextSibling
+    }
+    lineN += lineView.size
+  }
+  while (cur) { cur = rm(cur) }
+}
+
+function updateGutterSpace(cm) {
+  var width = cm.display.gutters.offsetWidth
+  cm.display.sizer.style.marginLeft = width + "px"
+}
+
+function setDocumentHeight(cm, measure) {
+  cm.display.sizer.style.minHeight = measure.docHeight + "px"
+  cm.display.heightForcer.style.top = measure.docHeight + "px"
+  cm.display.gutters.style.height = (measure.docHeight + cm.display.barHeight + scrollGap(cm)) + "px"
+}
+
+// Rebuild the gutter elements, ensure the margin to the left of the
+// code matches their width.
+function updateGutters(cm) {
+  var gutters = cm.display.gutters, specs = cm.options.gutters
+  removeChildren(gutters)
+  var i = 0
+  for (; i < specs.length; ++i) {
+    var gutterClass = specs[i]
+    var gElt = gutters.appendChild(elt("div", null, "CodeMirror-gutter " + gutterClass))
+    if (gutterClass == "CodeMirror-linenumbers") {
+      cm.display.lineGutter = gElt
+      gElt.style.width = (cm.display.lineNumWidth || 1) + "px"
+    }
+  }
+  gutters.style.display = i ? "" : "none"
+  updateGutterSpace(cm)
+}
+
+// Make sure the gutters options contains the element
+// "CodeMirror-linenumbers" when the lineNumbers option is true.
+function setGuttersForLineNumbers(options) {
+  var found = indexOf(options.gutters, "CodeMirror-linenumbers")
+  if (found == -1 && options.lineNumbers) {
+    options.gutters = options.gutters.concat(["CodeMirror-linenumbers"])
+  } else if (found > -1 && !options.lineNumbers) {
+    options.gutters = options.gutters.slice(0)
+    options.gutters.splice(found, 1)
+  }
+}
+
+// Selection objects are immutable. A new one is created every time
+// the selection changes. A selection is one or more non-overlapping
+// (and non-touching) ranges, sorted, and an integer that indicates
+// which one is the primary selection (the one that's scrolled into
+// view, that getCursor returns, etc).
+var Selection = function(ranges, primIndex) {
+  this.ranges = ranges
+  this.primIndex = primIndex
+};
+
+Selection.prototype.primary = function () { return this.ranges[this.primIndex] };
+
+Selection.prototype.equals = function (other) {
+    var this$1 = this;
+
+  if (other == this) { return true }
+  if (other.primIndex != this.primIndex || other.ranges.length != this.ranges.length) { return false }
+  for (var i = 0; i < this.ranges.length; i++) {
+    var here = this$1.ranges[i], there = other.ranges[i]
+    if (!equalCursorPos(here.anchor, there.anchor) || !equalCursorPos(here.head, there.head)) { return false }
+  }
+  return true
+};
+
+Selection.prototype.deepCopy = function () {
+    var this$1 = this;
+
+  var out = []
+  for (var i = 0; i < this.ranges.length; i++)
+    { out[i] = new Range(copyPos(this$1.ranges[i].anchor), copyPos(this$1.ranges[i].head)) }
+  return new Selection(out, this.primIndex)
+};
+
+Selection.prototype.somethingSelected = function () {
+    var this$1 = this;
+
+  for (var i = 0; i < this.ranges.length; i++)
+    { if (!this$1.ranges[i].empty()) { return true } }
+  return false
+};
+
+Selection.prototype.contains = function (pos, end) {
+    var this$1 = this;
+
+  if (!end) { end = pos }
+  for (var i = 0; i < this.ranges.length; i++) {
+    var range = this$1.ranges[i]
+    if (cmp(end, range.from()) >= 0 && cmp(pos, range.to()) <= 0)
+      { return i }
+  }
+  return -1
+};
+
+var Range = function(anchor, head) {
+  this.anchor = anchor; this.head = head
+};
+
+Range.prototype.from = function () { return minPos(this.anchor, this.head) };
+Range.prototype.to = function () { return maxPos(this.anchor, this.head) };
+Range.prototype.empty = function () { return this.head.line == this.anchor.line && this.head.ch == this.anchor.ch };
+
+// Take an unsorted, potentially overlapping set of ranges, and
+// build a selection out of it. 'Consumes' ranges array (modifying
+// it).
+function normalizeSelection(ranges, primIndex) {
+  var prim = ranges[primIndex]
+  ranges.sort(function (a, b) { return cmp(a.from(), b.from()); })
+  primIndex = indexOf(ranges, prim)
+  for (var i = 1; i < ranges.length; i++) {
+    var cur = ranges[i], prev = ranges[i - 1]
+    if (cmp(prev.to(), cur.from()) >= 0) {
+      var from = minPos(prev.from(), cur.from()), to = maxPos(prev.to(), cur.to())
+      var inv = prev.empty() ? cur.from() == cur.head : prev.from() == prev.head
+      if (i <= primIndex) { --primIndex }
+      ranges.splice(--i, 2, new Range(inv ? to : from, inv ? from : to))
+    }
+  }
+  return new Selection(ranges, primIndex)
+}
+
+function simpleSelection(anchor, head) {
+  return new Selection([new Range(anchor, head || anchor)], 0)
+}
+
+// Compute the position of the end of a change (its 'to' property
+// refers to the pre-change end).
+function changeEnd(change) {
+  if (!change.text) { return change.to }
+  return Pos(change.from.line + change.text.length - 1,
+             lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0))
+}
+
+// Adjust a position to refer to the post-change position of the
+// same text, or the end of the change if the change covers it.
+function adjustForChange(pos, change) {
+  if (cmp(pos, change.from) < 0) { return pos }
+  if (cmp(pos, change.to) <= 0) { return changeEnd(change) }
+
+  var line = pos.line + change.text.length - (change.to.line - change.from.line) - 1, ch = pos.ch
+  if (pos.line == change.to.line) { ch += changeEnd(change).ch - change.to.ch }
+  return Pos(line, ch)
+}
+
+function computeSelAfterChange(doc, change) {
+  var out = []
+  for (var i = 0; i < doc.sel.ranges.length; i++) {
+    var range = doc.sel.ranges[i]
+    out.push(new Range(adjustForChange(range.anchor, change),
+                       adjustForChange(range.head, change)))
+  }
+  return normalizeSelection(out, doc.sel.primIndex)
+}
+
+function offsetPos(pos, old, nw) {
+  if (pos.line == old.line)
+    { return Pos(nw.line, pos.ch - old.ch + nw.ch) }
+  else
+    { return Pos(nw.line + (pos.line - old.line), pos.ch) }
+}
+
+// Used by replaceSelections to allow moving the selection to the
+// start or around the replaced test. Hint may be "start" or "around".
+function computeReplacedSel(doc, changes, hint) {
+  var out = []
+  var oldPrev = Pos(doc.first, 0), newPrev = oldPrev
+  for (var i = 0; i < changes.length; i++) {
+    var change = changes[i]
+    var from = offsetPos(change.from, oldPrev, newPrev)
+    var to = offsetPos(changeEnd(change), oldPrev, newPrev)
+    oldPrev = change.to
+    newPrev = to
+    if (hint == "around") {
+      var range = doc.sel.ranges[i], inv = cmp(range.head, range.anchor) < 0
+      out[i] = new Range(inv ? to : from, inv ? from : to)
+    } else {
+      out[i] = new Range(from, from)
+    }
+  }
+  return new Selection(out, doc.sel.primIndex)
+}
+
+// Used to get the editor into a consistent state again when options change.
+
+function loadMode(cm) {
+  cm.doc.mode = getMode(cm.options, cm.doc.modeOption)
+  resetModeState(cm)
+}
+
+function resetModeState(cm) {
+  cm.doc.iter(function (line) {
+    if (line.stateAfter) { line.stateAfter = null }
+    if (line.styles) { line.styles = null }
+  })
+  cm.doc.frontier = cm.doc.first
+  startWorker(cm, 100)
+  cm.state.modeGen++
+  if (cm.curOp) { regChange(cm) }
+}
+
+// DOCUMENT DATA STRUCTURE
+
+// By default, updates that start and end at the beginning of a line
+// are treated specially, in order to make the association of line
+// widgets and marker elements with the text behave more intuitive.
+function isWholeLineUpdate(doc, change) {
+  return change.from.ch == 0 && change.to.ch == 0 && lst(change.text) == "" &&
+    (!doc.cm || doc.cm.options.wholeLineUpdateBefore)
+}
+
+// Perform a change on the document data structure.
+function updateDoc(doc, change, markedSpans, estimateHeight) {
+  function spansFor(n) {return markedSpans ? markedSpans[n] : null}
+  function update(line, text, spans) {
+    updateLine(line, text, spans, estimateHeight)
+    signalLater(line, "change", line, change)
+  }
+  function linesFor(start, end) {
+    var result = []
+    for (var i = start; i < end; ++i)
+      { result.push(new Line(text[i], spansFor(i), estimateHeight)) }
+    return result
+  }
+
+  var from = change.from, to = change.to, text = change.text
+  var firstLine = getLine(doc, from.line), lastLine = getLine(doc, to.line)
+  var lastText = lst(text), lastSpans = spansFor(text.length - 1), nlines = to.line - from.line
+
+  // Adjust the line structure
+  if (change.full) {
+    doc.insert(0, linesFor(0, text.length))
+    doc.remove(text.length, doc.size - text.length)
+  } else if (isWholeLineUpdate(doc, change)) {
+    // This is a whole-line replace. Treated specially to make
+    // sure line objects move the way they are supposed to.
+    var added = linesFor(0, text.length - 1)
+    update(lastLine, lastLine.text, lastSpans)
+    if (nlines) { doc.remove(from.line, nlines) }
+    if (added.length) { doc.insert(from.line, added) }
+  } else if (firstLine == lastLine) {
+    if (text.length == 1) {
+      update(firstLine, firstLine.text.slice(0, from.ch) + lastText + firstLine.text.slice(to.ch), lastSpans)
+    } else {
+      var added$1 = linesFor(1, text.length - 1)
+      added$1.push(new Line(lastText + firstLine.text.slice(to.ch), lastSpans, estimateHeight))
+      update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0))
+      doc.insert(from.line + 1, added$1)
+    }
+  } else if (text.length == 1) {
+    update(firstLine, firstLine.text.slice(0, from.ch) + text[0] + lastLine.text.slice(to.ch), spansFor(0))
+    doc.remove(from.line + 1, nlines)
+  } else {
+    update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0))
+    update(lastLine, lastText + lastLine.text.slice(to.ch), lastSpans)
+    var added$2 = linesFor(1, text.length - 1)
+    if (nlines > 1) { doc.remove(from.line + 1, nlines - 1) }
+    doc.insert(from.line + 1, added$2)
+  }
+
+  signalLater(doc, "change", doc, change)
+}
+
+// Call f for all linked documents.
+function linkedDocs(doc, f, sharedHistOnly) {
+  function propagate(doc, skip, sharedHist) {
+    if (doc.linked) { for (var i = 0; i < doc.linked.length; ++i) {
+      var rel = doc.linked[i]
+      if (rel.doc == skip) { continue }
+      var shared = sharedHist && rel.sharedHist
+      if (sharedHistOnly && !shared) { continue }
+      f(rel.doc, shared)
+      propagate(rel.doc, doc, shared)
+    } }
+  }
+  propagate(doc, null, true)
+}
+
+// Attach a document to an editor.
+function attachDoc(cm, doc) {
+  if (doc.cm) { throw new Error("This document is already in use.") }
+  cm.doc = doc
+  doc.cm = cm
+  estimateLineHeights(cm)
+  loadMode(cm)
+  setDirectionClass(cm)
+  if (!cm.options.lineWrapping) { findMaxLine(cm) }
+  cm.options.mode = doc.modeOption
+  regChange(cm)
+}
+
+function setDirectionClass(cm) {
+  ;(cm.doc.direction == "rtl" ? addClass : rmClass)(cm.display.lineDiv, "CodeMirror-rtl")
+}
+
+function directionChanged(cm) {
+  runInOp(cm, function () {
+    setDirectionClass(cm)
+    regChange(cm)
+  })
+}
+
+function History(startGen) {
+  // Arrays of change events and selections. Doing something adds an
+  // event to done and clears undo. Undoing moves events from done
+  // to undone, redoing moves them in the other direction.
+  this.done = []; this.undone = []
+  this.undoDepth = Infinity
+  // Used to track when changes can be merged into a single undo
+  // event
+  this.lastModTime = this.lastSelTime = 0
+  this.lastOp = this.lastSelOp = null
+  this.lastOrigin = this.lastSelOrigin = null
+  // Used by the isClean() method
+  this.generation = this.maxGeneration = startGen || 1
+}
+
+// Create a history change event from an updateDoc-style change
+// object.
+function historyChangeFromChange(doc, change) {
+  var histChange = {from: copyPos(change.from), to: changeEnd(change), text: getBetween(doc, change.from, change.to)}
+  attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1)
+  linkedDocs(doc, function (doc) { return attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1); }, true)
+  return histChange
+}
+
+// Pop all selection events off the end of a history array. Stop at
+// a change event.
+function clearSelectionEvents(array) {
+  while (array.length) {
+    var last = lst(array)
+    if (last.ranges) { array.pop() }
+    else { break }
+  }
+}
+
+// Find the top change event in the history. Pop off selection
+// events that are in the way.
+function lastChangeEvent(hist, force) {
+  if (force) {
+    clearSelectionEvents(hist.done)
+    return lst(hist.done)
+  } else if (hist.done.length && !lst(hist.done).ranges) {
+    return lst(hist.done)
+  } else if (hist.done.length > 1 && !hist.done[hist.done.length - 2].ranges) {
+    hist.done.pop()
+    return lst(hist.done)
+  }
+}
+
+// Register a change in the history. Merges changes that are within
+// a single operation, or are close together with an origin that
+// allows merging (starting with "+") into a single event.
+function addChangeToHistory(doc, change, selAfter, opId) {
+  var hist = doc.history
+  hist.undone.length = 0
+  var time = +new Date, cur
+  var last
+
+  if ((hist.lastOp == opId ||
+       hist.lastOrigin == change.origin && change.origin &&
+       ((change.origin.charAt(0) == "+" && doc.cm && hist.lastModTime > time - doc.cm.options.historyEventDelay) ||
+        change.origin.charAt(0) == "*")) &&
+      (cur = lastChangeEvent(hist, hist.lastOp == opId))) {
+    // Merge this change into the last event
+    last = lst(cur.changes)
+    if (cmp(change.from, change.to) == 0 && cmp(change.from, last.to) == 0) {
+      // Optimized case for simple insertion -- don't want to add
+      // new changesets for every character typed
+      last.to = changeEnd(change)
+    } else {
+      // Add new sub-event
+      cur.changes.push(historyChangeFromChange(doc, change))
+    }
+  } else {
+    // Can not be merged, start a new event.
+    var before = lst(hist.done)
+    if (!before || !before.ranges)
+      { pushSelectionToHistory(doc.sel, hist.done) }
+    cur = {changes: [historyChangeFromChange(doc, change)],
+           generation: hist.generation}
+    hist.done.push(cur)
+    while (hist.done.length > hist.undoDepth) {
+      hist.done.shift()
+      if (!hist.done[0].ranges) { hist.done.shift() }
+    }
+  }
+  hist.done.push(selAfter)
+  hist.generation = ++hist.maxGeneration
+  hist.lastModTime = hist.lastSelTime = time
+  hist.lastOp = hist.lastSelOp = opId
+  hist.lastOrigin = hist.lastSelOrigin = change.origin
+
+  if (!last) { signal(doc, "historyAdded") }
+}
+
+function selectionEventCanBeMerged(doc, origin, prev, sel) {
+  var ch = origin.charAt(0)
+  return ch == "*" ||
+    ch == "+" &&
+    prev.ranges.length == sel.ranges.length &&
+    prev.somethingSelected() == sel.somethingSelected() &&
+    new Date - doc.history.lastSelTime <= (doc.cm ? doc.cm.options.historyEventDelay : 500)
+}
+
+// Called whenever the selection changes, sets the new selection as
+// the pending selection in the history, and pushes the old pending
+// selection into the 'done' array when it was significantly
+// different (in number of selected ranges, emptiness, or time).
+function addSelectionToHistory(doc, sel, opId, options) {
+  var hist = doc.history, origin = options && options.origin
+
+  // A new event is started when the previous origin does not match
+  // the current, or the origins don't allow matching. Origins
+  // starting with * are always merged, those starting with + are
+  // merged when similar and close together in time.
+  if (opId == hist.lastSelOp ||
+      (origin && hist.lastSelOrigin == origin &&
+       (hist.lastModTime == hist.lastSelTime && hist.lastOrigin == origin ||
+        selectionEventCanBeMerged(doc, origin, lst(hist.done), sel))))
+    { hist.done[hist.done.length - 1] = sel }
+  else
+    { pushSelectionToHistory(sel, hist.done) }
+
+  hist.lastSelTime = +new Date
+  hist.lastSelOrigin = origin
+  hist.lastSelOp = opId
+  if (options && options.clearRedo !== false)
+    { clearSelectionEvents(hist.undone) }
+}
+
+function pushSelectionToHistory(sel, dest) {
+  var top = lst(dest)
+  if (!(top && top.ranges && top.equals(sel)))
+    { dest.push(sel) }
+}
+
+// Used to store marked span information in the history.
+function attachLocalSpans(doc, change, from, to) {
+  var existing = change["spans_" + doc.id], n = 0
+  doc.iter(Math.max(doc.first, from), Math.min(doc.first + doc.size, to), function (line) {
+    if (line.markedSpans)
+      { (existing || (existing = change["spans_" + doc.id] = {}))[n] = line.markedSpans }
+    ++n
+  })
+}
+
+// When un/re-doing restores text containing marked spans, those
+// that have been explicitly cleared should not be restored.
+function removeClearedSpans(spans) {
+  if (!spans) { return null }
+  var out
+  for (var i = 0; i < spans.length; ++i) {
+    if (spans[i].marker.explicitlyCleared) { if (!out) { out = spans.slice(0, i) } }
+    else if (out) { out.push(spans[i]) }
+  }
+  return !out ? spans : out.length ? out : null
+}
+
+// Retrieve and filter the old marked spans stored in a change event.
+function getOldSpans(doc, change) {
+  var found = change["spans_" + doc.id]
+  if (!found) { return null }
+  var nw = []
+  for (var i = 0; i < change.text.length; ++i)
+    { nw.push(removeClearedSpans(found[i])) }
+  return nw
+}
+
+// Used for un/re-doing changes from the history. Combines the
+// result of computing the existing spans with the set of spans that
+// existed in the history (so that deleting around a span and then
+// undoing brings back the span).
+function mergeOldSpans(doc, change) {
+  var old = getOldSpans(doc, change)
+  var stretched = stretchSpansOverChange(doc, change)
+  if (!old) { return stretched }
+  if (!stretched) { return old }
+
+  for (var i = 0; i < old.length; ++i) {
+    var oldCur = old[i], stretchCur = stretched[i]
+    if (oldCur && stretchCur) {
+      spans: for (var j = 0; j < stretchCur.length; ++j) {
+        var span = stretchCur[j]
+        for (var k = 0; k < oldCur.length; ++k)
+          { if (oldCur[k].marker == span.marker) { continue spans } }
+        oldCur.push(span)
+      }
+    } else if (stretchCur) {
+      old[i] = stretchCur
+    }
+  }
+  return old
+}
+
+// Used both to provide a JSON-safe object in .getHistory, and, when
+// detaching a document, to split the history in two
+function copyHistoryArray(events, newGroup, instantiateSel) {
+  var copy = []
+  for (var i = 0; i < events.length; ++i) {
+    var event = events[i]
+    if (event.ranges) {
+      copy.push(instantiateSel ? Selection.prototype.deepCopy.call(event) : event)
+      continue
+    }
+    var changes = event.changes, newChanges = []
+    copy.push({changes: newChanges})
+    for (var j = 0; j < changes.length; ++j) {
+      var change = changes[j], m = (void 0)
+      newChanges.push({from: change.from, to: change.to, text: change.text})
+      if (newGroup) { for (var prop in change) { if (m = prop.match(/^spans_(\d+)$/)) {
+        if (indexOf(newGroup, Number(m[1])) > -1) {
+          lst(newChanges)[prop] = change[prop]
+          delete change[prop]
+        }
+      } } }
+    }
+  }
+  return copy
+}
+
+// The 'scroll' parameter given to many of these indicated whether
+// the new cursor position should be scrolled into view after
+// modifying the selection.
+
+// If shift is held or the extend flag is set, extends a range to
+// include a given position (and optionally a second position).
+// Otherwise, simply returns the range between the given positions.
+// Used for cursor motion and such.
+function extendRange(doc, range, head, other) {
+  if (doc.cm && doc.cm.display.shift || doc.extend) {
+    var anchor = range.anchor
+    if (other) {
+      var posBefore = cmp(head, anchor) < 0
+      if (posBefore != (cmp(other, anchor) < 0)) {
+        anchor = head
+        head = other
+      } else if (posBefore != (cmp(head, other) < 0)) {
+        head = other
+      }
+    }
+    return new Range(anchor, head)
+  } else {
+    return new Range(other || head, head)
+  }
+}
+
+// Extend the primary selection range, discard the rest.
+function extendSelection(doc, head, other, options) {
+  setSelection(doc, new Selection([extendRange(doc, doc.sel.primary(), head, other)], 0), options)
+}
+
+// Extend all selections (pos is an array of selections with length
+// equal the number of selections)
+function extendSelections(doc, heads, options) {
+  var out = []
+  for (var i = 0; i < doc.sel.ranges.length; i++)
+    { out[i] = extendRange(doc, doc.sel.ranges[i], heads[i], null) }
+  var newSel = normalizeSelection(out, doc.sel.primIndex)
+  setSelection(doc, newSel, options)
+}
+
+// Updates a single range in the selection.
+function replaceOneSelection(doc, i, range, options) {
+  var ranges = doc.sel.ranges.slice(0)
+  ranges[i] = range
+  setSelection(doc, normalizeSelection(ranges, doc.sel.primIndex), options)
+}
+
+// Reset the selection to a single range.
+function setSimpleSelection(doc, anchor, head, options) {
+  setSelection(doc, simpleSelection(anchor, head), options)
+}
+
+// Give beforeSelectionChange handlers a change to influence a
+// selection update.
+function filterSelectionChange(doc, sel, options) {
+  var obj = {
+    ranges: sel.ranges,
+    update: function(ranges) {
+      var this$1 = this;
+
+      this.ranges = []
+      for (var i = 0; i < ranges.length; i++)
+        { this$1.ranges[i] = new Range(clipPos(doc, ranges[i].anchor),
+                                   clipPos(doc, ranges[i].head)) }
+    },
+    origin: options && options.origin
+  }
+  signal(doc, "beforeSelectionChange", doc, obj)
+  if (doc.cm) { signal(doc.cm, "beforeSelectionChange", doc.cm, obj) }
+  if (obj.ranges != sel.ranges) { return normalizeSelection(obj.ranges, obj.ranges.length - 1) }
+  else { return sel }
+}
+
+function setSelectionReplaceHistory(doc, sel, options) {
+  var done = doc.history.done, last = lst(done)
+  if (last && last.ranges) {
+    done[done.length - 1] = sel
+    setSelectionNoUndo(doc, sel, options)
+  } else {
+    setSelection(doc, sel, options)
+  }
+}
+
+// Set a new selection.
+function setSelection(doc, sel, options) {
+  setSelectionNoUndo(doc, sel, options)
+  addSelectionToHistory(doc, doc.sel, doc.cm ? doc.cm.curOp.id : NaN, options)
+}
+
+function setSelectionNoUndo(doc, sel, options) {
+  if (hasHandler(doc, "beforeSelectionChange") || doc.cm && hasHandler(doc.cm, "beforeSelectionChange"))
+    { sel = filterSelectionChange(doc, sel, options) }
+
+  var bias = options && options.bias ||
+    (cmp(sel.primary().head, doc.sel.primary().head) < 0 ? -1 : 1)
+  setSelectionInner(doc, skipAtomicInSelection(doc, sel, bias, true))
+
+  if (!(options && options.scroll === false) && doc.cm)
+    { ensureCursorVisible(doc.cm) }
+}
+
+function setSelectionInner(doc, sel) {
+  if (sel.equals(doc.sel)) { return }
+
+  doc.sel = sel
+
+  if (doc.cm) {
+    doc.cm.curOp.updateInput = doc.cm.curOp.selectionChanged = true
+    signalCursorActivity(doc.cm)
+  }
+  signalLater(doc, "cursorActivity", doc)
+}
+
+// Verify that the selection does not partially select any atomic
+// marked ranges.
+function reCheckSelection(doc) {
+  setSelectionInner(doc, skipAtomicInSelection(doc, doc.sel, null, false), sel_dontScroll)
+}
+
+// Return a selection that does not partially select any atomic
+// ranges.
+function skipAtomicInSelection(doc, sel, bias, mayClear) {
+  var out
+  for (var i = 0; i < sel.ranges.length; i++) {
+    var range = sel.ranges[i]
+    var old = sel.ranges.length == doc.sel.ranges.length && doc.sel.ranges[i]
+    var newAnchor = skipAtomic(doc, range.anchor, old && old.anchor, bias, mayClear)
+    var newHead = skipAtomic(doc, range.head, old && old.head, bias, mayClear)
+    if (out || newAnchor != range.anchor || newHead != range.head) {
+      if (!out) { out = sel.ranges.slice(0, i) }
+      out[i] = new Range(newAnchor, newHead)
+    }
+  }
+  return out ? normalizeSelection(out, sel.primIndex) : sel
+}
+
+function skipAtomicInner(doc, pos, oldPos, dir, mayClear) {
+  var line = getLine(doc, pos.line)
+  if (line.markedSpans) { for (var i = 0; i < line.markedSpans.length; ++i) {
+    var sp = line.markedSpans[i], m = sp.marker
+    if ((sp.from == null || (m.inclusiveLeft ? sp.from <= pos.ch : sp.from < pos.ch)) &&
+        (sp.to == null || (m.inclusiveRight ? sp.to >= pos.ch : sp.to > pos.ch))) {
+      if (mayClear) {
+        signal(m, "beforeCursorEnter")
+        if (m.explicitlyCleared) {
+          if (!line.markedSpans) { break }
+          else {--i; continue}
+        }
+      }
+      if (!m.atomic) { continue }
+
+      if (oldPos) {
+        var near = m.find(dir < 0 ? 1 : -1), diff = (void 0)
+        if (dir < 0 ? m.inclusiveRight : m.inclusiveLeft)
+          { near = movePos(doc, near, -dir, near && near.line == pos.line ? line : null) }
+        if (near && near.line == pos.line && (diff = cmp(near, oldPos)) && (dir < 0 ? diff < 0 : diff > 0))
+          { return skipAtomicInner(doc, near, pos, dir, mayClear) }
+      }
+
+      var far = m.find(dir < 0 ? -1 : 1)
+      if (dir < 0 ? m.inclusiveLeft : m.inclusiveRight)
+        { far = movePos(doc, far, dir, far.line == pos.line ? line : null) }
+      return far ? skipAtomicInner(doc, far, pos, dir, mayClear) : null
+    }
+  } }
+  return pos
+}
+
+// Ensure a given position is not inside an atomic range.
+function skipAtomic(doc, pos, oldPos, bias, mayClear) {
+  var dir = bias || 1
+  var found = skipAtomicInner(doc, pos, oldPos, dir, mayClear) ||
+      (!mayClear && skipAtomicInner(doc, pos, oldPos, dir, true)) ||
+      skipAtomicInner(doc, pos, oldPos, -dir, mayClear) ||
+      (!mayClear && skipAtomicInner(doc, pos, oldPos, -dir, true))
+  if (!found) {
+    doc.cantEdit = true
+    return Pos(doc.first, 0)
+  }
+  return found
+}
+
+function movePos(doc, pos, dir, line) {
+  if (dir < 0 && pos.ch == 0) {
+    if (pos.line > doc.first) { return clipPos(doc, Pos(pos.line - 1)) }
+    else { return null }
+  } else if (dir > 0 && pos.ch == (line || getLine(doc, pos.line)).text.length) {
+    if (pos.line < doc.first + doc.size - 1) { return Pos(pos.line + 1, 0) }
+    else { return null }
+  } else {
+    return new Pos(pos.line, pos.ch + dir)
+  }
+}
+
+function selectAll(cm) {
+  cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()), sel_dontScroll)
+}
+
+// UPDATING
+
+// Allow "beforeChange" event handlers to influence a change
+function filterChange(doc, change, update) {
+  var obj = {
+    canceled: false,
+    from: change.from,
+    to: change.to,
+    text: change.text,
+    origin: change.origin,
+    cancel: function () { return obj.canceled = true; }
+  }
+  if (update) { obj.update = function (from, to, text, origin) {
+    if (from) { obj.from = clipPos(doc, from) }
+    if (to) { obj.to = clipPos(doc, to) }
+    if (text) { obj.text = text }
+    if (origin !== undefined) { obj.origin = origin }
+  } }
+  signal(doc, "beforeChange", doc, obj)
+  if (doc.cm) { signal(doc.cm, "beforeChange", doc.cm, obj) }
+
+  if (obj.canceled) { return null }
+  return {from: obj.from, to: obj.to, text: obj.text, origin: obj.origin}
+}
+
+// Apply a change to a document, and add it to the document's
+// history, and propagating it to all linked documents.
+function makeChange(doc, change, ignoreReadOnly) {
+  if (doc.cm) {
+    if (!doc.cm.curOp) { return operation(doc.cm, makeChange)(doc, change, ignoreReadOnly) }
+    if (doc.cm.state.suppressEdits) { return }
+  }
+
+  if (hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")) {
+    change = filterChange(doc, change, true)
+    if (!change) { return }
+  }
+
+  // Possibly split or suppress the update based on the presence
+  // of read-only spans in its range.
+  var split = sawReadOnlySpans && !ignoreReadOnly && removeReadOnlyRanges(doc, change.from, change.to)
+  if (split) {
+    for (var i = split.length - 1; i >= 0; --i)
+      { makeChangeInner(doc, {from: split[i].from, to: split[i].to, text: i ? [""] : change.text}) }
+  } else {
+    makeChangeInner(doc, change)
+  }
+}
+
+function makeChangeInner(doc, change) {
+  if (change.text.length == 1 && change.text[0] == "" && cmp(change.from, change.to) == 0) { return }
+  var selAfter = computeSelAfterChange(doc, change)
+  addChangeToHistory(doc, change, selAfter, doc.cm ? doc.cm.curOp.id : NaN)
+
+  makeChangeSingleDoc(doc, change, selAfter, stretchSpansOverChange(doc, change))
+  var rebased = []
+
+  linkedDocs(doc, function (doc, sharedHist) {
+    if (!sharedHist && indexOf(rebased, doc.history) == -1) {
+      rebaseHist(doc.history, change)
+      rebased.push(doc.history)
+    }
+    makeChangeSingleDoc(doc, change, null, stretchSpansOverChange(doc, change))
+  })
+}
+
+// Revert a change stored in a document's history.
+function makeChangeFromHistory(doc, type, allowSelectionOnly) {
+  if (doc.cm && doc.cm.state.suppressEdits && !allowSelectionOnly) { return }
+
+  var hist = doc.history, event, selAfter = doc.sel
+  var source = type == "undo" ? hist.done : hist.undone, dest = type == "undo" ? hist.undone : hist.done
+
+  // Verify that there is a useable event (so that ctrl-z won't
+  // needlessly clear selection events)
+  var i = 0
+  for (; i < source.length; i++) {
+    event = source[i]
+    if (allowSelectionOnly ? event.ranges && !event.equals(doc.sel) : !event.ranges)
+      { break }
+  }
+  if (i == source.length) { return }
+  hist.lastOrigin = hist.lastSelOrigin = null
+
+  for (;;) {
+    event = source.pop()
+    if (event.ranges) {
+      pushSelectionToHistory(event, dest)
+      if (allowSelectionOnly && !event.equals(doc.sel)) {
+        setSelection(doc, event, {clearRedo: false})
+        return
+      }
+      selAfter = event
+    }
+    else { break }
+  }
+
+  // Build up a reverse change object to add to the opposite history
+  // stack (redo when undoing, and vice versa).
+  var antiChanges = []
+  pushSelectionToHistory(selAfter, dest)
+  dest.push({changes: antiChanges, generation: hist.generation})
+  hist.generation = event.generation || ++hist.maxGeneration
+
+  var filter = hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")
+
+  var loop = function ( i ) {
+    var change = event.changes[i]
+    change.origin = type
+    if (filter && !filterChange(doc, change, false)) {
+      source.length = 0
+      return {}
+    }
+
+    antiChanges.push(historyChangeFromChange(doc, change))
+
+    var after = i ? computeSelAfterChange(doc, change) : lst(source)
+    makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change))
+    if (!i && doc.cm) { doc.cm.scrollIntoView({from: change.from, to: changeEnd(change)}) }
+    var rebased = []
+
+    // Propagate to the linked documents
+    linkedDocs(doc, function (doc, sharedHist) {
       if (!sharedHist && indexOf(rebased, doc.history) == -1) {
-        rebaseHist(doc.history, change);
-        rebased.push(doc.history);
+        rebaseHist(doc.history, change)
+        rebased.push(doc.history)
       }
-      makeChangeSingleDoc(doc, change, null, stretchSpansOverChange(doc, change));
-    });
+      makeChangeSingleDoc(doc, change, null, mergeOldSpans(doc, change))
+    })
+  };
+
+  for (var i$1 = event.changes.length - 1; i$1 >= 0; --i$1) {
+    var returned = loop( i$1 );
+
+    if ( returned ) return returned.v;
+  }
+}
+
+// Sub-views need their line numbers shifted when text is added
+// above or below them in the parent document.
+function shiftDoc(doc, distance) {
+  if (distance == 0) { return }
+  doc.first += distance
+  doc.sel = new Selection(map(doc.sel.ranges, function (range) { return new Range(
+    Pos(range.anchor.line + distance, range.anchor.ch),
+    Pos(range.head.line + distance, range.head.ch)
+  ); }), doc.sel.primIndex)
+  if (doc.cm) {
+    regChange(doc.cm, doc.first, doc.first - distance, distance)
+    for (var d = doc.cm.display, l = d.viewFrom; l < d.viewTo; l++)
+      { regLineChange(doc.cm, l, "gutter") }
+  }
+}
+
+// More lower-level change function, handling only a single document
+// (not linked ones).
+function makeChangeSingleDoc(doc, change, selAfter, spans) {
+  if (doc.cm && !doc.cm.curOp)
+    { return operation(doc.cm, makeChangeSingleDoc)(doc, change, selAfter, spans) }
+
+  if (change.to.line < doc.first) {
+    shiftDoc(doc, change.text.length - 1 - (change.to.line - change.from.line))
+    return
+  }
+  if (change.from.line > doc.lastLine()) { return }
+
+  // Clip the change to the size of this doc
+  if (change.from.line < doc.first) {
+    var shift = change.text.length - 1 - (doc.first - change.from.line)
+    shiftDoc(doc, shift)
+    change = {from: Pos(doc.first, 0), to: Pos(change.to.line + shift, change.to.ch),
+              text: [lst(change.text)], origin: change.origin}
+  }
+  var last = doc.lastLine()
+  if (change.to.line > last) {
+    change = {from: change.from, to: Pos(last, getLine(doc, last).text.length),
+              text: [change.text[0]], origin: change.origin}
   }
 
-  function makeChangeFromHistory(doc, type) {
-    if (doc.cm && doc.cm.state.suppressEdits) return;
+  change.removed = getBetween(doc, change.from, change.to)
 
-    var hist = doc.history;
-    var event = (type == "undo" ? hist.done : hist.undone).pop();
-    if (!event) return;
+  if (!selAfter) { selAfter = computeSelAfterChange(doc, change) }
+  if (doc.cm) { makeChangeSingleDocInEditor(doc.cm, change, spans) }
+  else { updateDoc(doc, change, spans) }
+  setSelectionNoUndo(doc, selAfter, sel_dontScroll)
+}
 
-    var anti = {changes: [], anchorBefore: event.anchorAfter, headBefore: event.headAfter,
-                anchorAfter: event.anchorBefore, headAfter: event.headBefore,
-                generation: hist.generation};
-    (type == "undo" ? hist.undone : hist.done).push(anti);
-    hist.generation = event.generation || ++hist.maxGeneration;
+// Handle the interaction of a change to a document with the editor
+// that this document is part of.
+function makeChangeSingleDocInEditor(cm, change, spans) {
+  var doc = cm.doc, display = cm.display, from = change.from, to = change.to
 
-    var filter = hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange");
-
-    for (var i = event.changes.length - 1; i >= 0; --i) {
-      var change = event.changes[i];
-      change.origin = type;
-      if (filter && !filterChange(doc, change, false)) {
-        (type == "undo" ? hist.done : hist.undone).length = 0;
-        return;
+  var recomputeMaxLength = false, checkWidthStart = from.line
+  if (!cm.options.lineWrapping) {
+    checkWidthStart = lineNo(visualLine(getLine(doc, from.line)))
+    doc.iter(checkWidthStart, to.line + 1, function (line) {
+      if (line == display.maxLine) {
+        recomputeMaxLength = true
+        return true
       }
-
-      anti.changes.push(historyChangeFromChange(doc, change));
-
-      var after = i ? computeSelAfterChange(doc, change, null)
-                    : {anchor: event.anchorBefore, head: event.headBefore};
-      makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change));
-      var rebased = [];
-
-      linkedDocs(doc, function(doc, sharedHist) {
-        if (!sharedHist && indexOf(rebased, doc.history) == -1) {
-          rebaseHist(doc.history, change);
-          rebased.push(doc.history);
-        }
-        makeChangeSingleDoc(doc, change, null, mergeOldSpans(doc, change));
-      });
-    }
+    })
   }
 
-  function shiftDoc(doc, distance) {
-    function shiftPos(pos) {return Pos(pos.line + distance, pos.ch);}
-    doc.first += distance;
-    if (doc.cm) regChange(doc.cm, doc.first, doc.first, distance);
-    doc.sel.head = shiftPos(doc.sel.head); doc.sel.anchor = shiftPos(doc.sel.anchor);
-    doc.sel.from = shiftPos(doc.sel.from); doc.sel.to = shiftPos(doc.sel.to);
-  }
+  if (doc.sel.contains(change.from, change.to) > -1)
+    { signalCursorActivity(cm) }
 
-  function makeChangeSingleDoc(doc, change, selAfter, spans) {
-    if (doc.cm && !doc.cm.curOp)
-      return operation(doc.cm, makeChangeSingleDoc)(doc, change, selAfter, spans);
+  updateDoc(doc, change, spans, estimateHeight(cm))
 
-    if (change.to.line < doc.first) {
-      shiftDoc(doc, change.text.length - 1 - (change.to.line - change.from.line));
-      return;
-    }
-    if (change.from.line > doc.lastLine()) return;
-
-    // Clip the change to the size of this doc
-    if (change.from.line < doc.first) {
-      var shift = change.text.length - 1 - (doc.first - change.from.line);
-      shiftDoc(doc, shift);
-      change = {from: Pos(doc.first, 0), to: Pos(change.to.line + shift, change.to.ch),
-                text: [lst(change.text)], origin: change.origin};
-    }
-    var last = doc.lastLine();
-    if (change.to.line > last) {
-      change = {from: change.from, to: Pos(last, getLine(doc, last).text.length),
-                text: [change.text[0]], origin: change.origin};
-    }
-
-    change.removed = getBetween(doc, change.from, change.to);
-
-    if (!selAfter) selAfter = computeSelAfterChange(doc, change, null);
-    if (doc.cm) makeChangeSingleDocInEditor(doc.cm, change, spans, selAfter);
-    else updateDoc(doc, change, spans, selAfter);
-  }
-
-  function makeChangeSingleDocInEditor(cm, change, spans, selAfter) {
-    var doc = cm.doc, display = cm.display, from = change.from, to = change.to;
-
-    var recomputeMaxLength = false, checkWidthStart = from.line;
-    if (!cm.options.lineWrapping) {
-      checkWidthStart = lineNo(visualLine(doc, getLine(doc, from.line)));
-      doc.iter(checkWidthStart, to.line + 1, function(line) {
-        if (line == display.maxLine) {
-          recomputeMaxLength = true;
-          return true;
-        }
-      });
-    }
-
-    if (!posLess(doc.sel.head, change.from) && !posLess(change.to, doc.sel.head))
-      cm.curOp.cursorActivity = true;
-
-    updateDoc(doc, change, spans, selAfter, estimateHeight(cm));
-
-    if (!cm.options.lineWrapping) {
-      doc.iter(checkWidthStart, from.line + change.text.length, function(line) {
-        var len = lineLength(doc, line);
-        if (len > display.maxLineLength) {
-          display.maxLine = line;
-          display.maxLineLength = len;
-          display.maxLineChanged = true;
-          recomputeMaxLength = false;
-        }
-      });
-      if (recomputeMaxLength) cm.curOp.updateMaxLine = true;
-    }
-
-    // Adjust frontier, schedule worker
-    doc.frontier = Math.min(doc.frontier, from.line);
-    startWorker(cm, 400);
-
-    var lendiff = change.text.length - (to.line - from.line) - 1;
-    // Remember that these lines changed, for updating the display
-    regChange(cm, from.line, to.line + 1, lendiff);
-
-    if (hasHandler(cm, "change")) {
-      var changeObj = {from: from, to: to,
-                       text: change.text,
-                       removed: change.removed,
-                       origin: change.origin};
-      if (cm.curOp.textChanged) {
-        for (var cur = cm.curOp.textChanged; cur.next; cur = cur.next) {}
-        cur.next = changeObj;
-      } else cm.curOp.textChanged = changeObj;
-    }
-  }
-
-  function replaceRange(doc, code, from, to, origin) {
-    if (!to) to = from;
-    if (posLess(to, from)) { var tmp = to; to = from; from = tmp; }
-    if (typeof code == "string") code = splitLines(code);
-    makeChange(doc, {from: from, to: to, text: code, origin: origin}, null);
-  }
-
-  // POSITION OBJECT
-
-  function Pos(line, ch) {
-    if (!(this instanceof Pos)) return new Pos(line, ch);
-    this.line = line; this.ch = ch;
-  }
-  CodeMirror.Pos = Pos;
-
-  function posEq(a, b) {return a.line == b.line && a.ch == b.ch;}
-  function posLess(a, b) {return a.line < b.line || (a.line == b.line && a.ch < b.ch);}
-  function copyPos(x) {return Pos(x.line, x.ch);}
-
-  // SELECTION
-
-  function clipLine(doc, n) {return Math.max(doc.first, Math.min(n, doc.first + doc.size - 1));}
-  function clipPos(doc, pos) {
-    if (pos.line < doc.first) return Pos(doc.first, 0);
-    var last = doc.first + doc.size - 1;
-    if (pos.line > last) return Pos(last, getLine(doc, last).text.length);
-    return clipToLen(pos, getLine(doc, pos.line).text.length);
-  }
-  function clipToLen(pos, linelen) {
-    var ch = pos.ch;
-    if (ch == null || ch > linelen) return Pos(pos.line, linelen);
-    else if (ch < 0) return Pos(pos.line, 0);
-    else return pos;
-  }
-  function isLine(doc, l) {return l >= doc.first && l < doc.first + doc.size;}
-
-  // If shift is held, this will move the selection anchor. Otherwise,
-  // it'll set the whole selection.
-  function extendSelection(doc, pos, other, bias) {
-    if (doc.sel.shift || doc.sel.extend) {
-      var anchor = doc.sel.anchor;
-      if (other) {
-        var posBefore = posLess(pos, anchor);
-        if (posBefore != posLess(other, anchor)) {
-          anchor = pos;
-          pos = other;
-        } else if (posBefore != posLess(pos, other)) {
-          pos = other;
-        }
+  if (!cm.options.lineWrapping) {
+    doc.iter(checkWidthStart, from.line + change.text.length, function (line) {
+      var len = lineLength(line)
+      if (len > display.maxLineLength) {
+        display.maxLine = line
+        display.maxLineLength = len
+        display.maxLineChanged = true
+        recomputeMaxLength = false
       }
-      setSelection(doc, anchor, pos, bias);
+    })
+    if (recomputeMaxLength) { cm.curOp.updateMaxLine = true }
+  }
+
+  // Adjust frontier, schedule worker
+  doc.frontier = Math.min(doc.frontier, from.line)
+  startWorker(cm, 400)
+
+  var lendiff = change.text.length - (to.line - from.line) - 1
+  // Remember that these lines changed, for updating the display
+  if (change.full)
+    { regChange(cm) }
+  else if (from.line == to.line && change.text.length == 1 && !isWholeLineUpdate(cm.doc, change))
+    { regLineChange(cm, from.line, "text") }
+  else
+    { regChange(cm, from.line, to.line + 1, lendiff) }
+
+  var changesHandler = hasHandler(cm, "changes"), changeHandler = hasHandler(cm, "change")
+  if (changeHandler || changesHandler) {
+    var obj = {
+      from: from, to: to,
+      text: change.text,
+      removed: change.removed,
+      origin: change.origin
+    }
+    if (changeHandler) { signalLater(cm, "change", cm, obj) }
+    if (changesHandler) { (cm.curOp.changeObjs || (cm.curOp.changeObjs = [])).push(obj) }
+  }
+  cm.display.selForContextMenu = null
+}
+
+function replaceRange(doc, code, from, to, origin) {
+  if (!to) { to = from }
+  if (cmp(to, from) < 0) { var tmp = to; to = from; from = tmp }
+  if (typeof code == "string") { code = doc.splitLines(code) }
+  makeChange(doc, {from: from, to: to, text: code, origin: origin})
+}
+
+// Rebasing/resetting history to deal with externally-sourced changes
+
+function rebaseHistSelSingle(pos, from, to, diff) {
+  if (to < pos.line) {
+    pos.line += diff
+  } else if (from < pos.line) {
+    pos.line = from
+    pos.ch = 0
+  }
+}
+
+// Tries to rebase an array of history events given a change in the
+// document. If the change touches the same lines as the event, the
+// event, and everything 'behind' it, is discarded. If the change is
+// before the event, the event's positions are updated. Uses a
+// copy-on-write scheme for the positions, to avoid having to
+// reallocate them all on every rebase, but also avoid problems with
+// shared position objects being unsafely updated.
+function rebaseHistArray(array, from, to, diff) {
+  for (var i = 0; i < array.length; ++i) {
+    var sub = array[i], ok = true
+    if (sub.ranges) {
+      if (!sub.copied) { sub = array[i] = sub.deepCopy(); sub.copied = true }
+      for (var j = 0; j < sub.ranges.length; j++) {
+        rebaseHistSelSingle(sub.ranges[j].anchor, from, to, diff)
+        rebaseHistSelSingle(sub.ranges[j].head, from, to, diff)
+      }
+      continue
+    }
+    for (var j$1 = 0; j$1 < sub.changes.length; ++j$1) {
+      var cur = sub.changes[j$1]
+      if (to < cur.from.line) {
+        cur.from = Pos(cur.from.line + diff, cur.from.ch)
+        cur.to = Pos(cur.to.line + diff, cur.to.ch)
+      } else if (from <= cur.to.line) {
+        ok = false
+        break
+      }
+    }
+    if (!ok) {
+      array.splice(0, i + 1)
+      i = 0
+    }
+  }
+}
+
+function rebaseHist(hist, change) {
+  var from = change.from.line, to = change.to.line, diff = change.text.length - (to - from) - 1
+  rebaseHistArray(hist.done, from, to, diff)
+  rebaseHistArray(hist.undone, from, to, diff)
+}
+
+// Utility for applying a change to a line by handle or number,
+// returning the number and optionally registering the line as
+// changed.
+function changeLine(doc, handle, changeType, op) {
+  var no = handle, line = handle
+  if (typeof handle == "number") { line = getLine(doc, clipLine(doc, handle)) }
+  else { no = lineNo(handle) }
+  if (no == null) { return null }
+  if (op(line, no) && doc.cm) { regLineChange(doc.cm, no, changeType) }
+  return line
+}
+
+// The document is represented as a BTree consisting of leaves, with
+// chunk of lines in them, and branches, with up to ten leaves or
+// other branch nodes below them. The top node is always a branch
+// node, and is the document object itself (meaning it has
+// additional methods and properties).
+//
+// All nodes have parent links. The tree is used both to go from
+// line numbers to line objects, and to go from objects to numbers.
+// It also indexes by height, and is used to convert between height
+// and line object, and to find the total height of the document.
+//
+// See also http://marijnhaverbeke.nl/blog/codemirror-line-tree.html
+
+var LeafChunk = function(lines) {
+  var this$1 = this;
+
+  this.lines = lines
+  this.parent = null
+  var height = 0
+  for (var i = 0; i < lines.length; ++i) {
+    lines[i].parent = this$1
+    height += lines[i].height
+  }
+  this.height = height
+};
+
+LeafChunk.prototype.chunkSize = function () { return this.lines.length };
+
+// Remove the n lines at offset 'at'.
+LeafChunk.prototype.removeInner = function (at, n) {
+    var this$1 = this;
+
+  for (var i = at, e = at + n; i < e; ++i) {
+    var line = this$1.lines[i]
+    this$1.height -= line.height
+    cleanUpLine(line)
+    signalLater(line, "delete")
+  }
+  this.lines.splice(at, n)
+};
+
+// Helper used to collapse a small branch into a single leaf.
+LeafChunk.prototype.collapse = function (lines) {
+  lines.push.apply(lines, this.lines)
+};
+
+// Insert the given array of lines at offset 'at', count them as
+// having the given height.
+LeafChunk.prototype.insertInner = function (at, lines, height) {
+    var this$1 = this;
+
+  this.height += height
+  this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at))
+  for (var i = 0; i < lines.length; ++i) { lines[i].parent = this$1 }
+};
+
+// Used to iterate over a part of the tree.
+LeafChunk.prototype.iterN = function (at, n, op) {
+    var this$1 = this;
+
+  for (var e = at + n; at < e; ++at)
+    { if (op(this$1.lines[at])) { return true } }
+};
+
+var BranchChunk = function(children) {
+  var this$1 = this;
+
+  this.children = children
+  var size = 0, height = 0
+  for (var i = 0; i < children.length; ++i) {
+    var ch = children[i]
+    size += ch.chunkSize(); height += ch.height
+    ch.parent = this$1
+  }
+  this.size = size
+  this.height = height
+  this.parent = null
+};
+
+BranchChunk.prototype.chunkSize = function () { return this.size };
+
+BranchChunk.prototype.removeInner = function (at, n) {
+    var this$1 = this;
+
+  this.size -= n
+  for (var i = 0; i < this.children.length; ++i) {
+    var child = this$1.children[i], sz = child.chunkSize()
+    if (at < sz) {
+      var rm = Math.min(n, sz - at), oldHeight = child.height
+      child.removeInner(at, rm)
+      this$1.height -= oldHeight - child.height
+      if (sz == rm) { this$1.children.splice(i--, 1); child.parent = null }
+      if ((n -= rm) == 0) { break }
+      at = 0
+    } else { at -= sz }
+  }
+  // If the result is smaller than 25 lines, ensure that it is a
+  // single leaf node.
+  if (this.size - n < 25 &&
+      (this.children.length > 1 || !(this.children[0] instanceof LeafChunk))) {
+    var lines = []
+    this.collapse(lines)
+    this.children = [new LeafChunk(lines)]
+    this.children[0].parent = this
+  }
+};
+
+BranchChunk.prototype.collapse = function (lines) {
+    var this$1 = this;
+
+  for (var i = 0; i < this.children.length; ++i) { this$1.children[i].collapse(lines) }
+};
+
+BranchChunk.prototype.insertInner = function (at, lines, height) {
+    var this$1 = this;
+
+  this.size += lines.length
+  this.height += height
+  for (var i = 0; i < this.children.length; ++i) {
+    var child = this$1.children[i], sz = child.chunkSize()
+    if (at <= sz) {
+      child.insertInner(at, lines, height)
+      if (child.lines && child.lines.length > 50) {
+        // To avoid memory thrashing when child.lines is huge (e.g. first view of a large file), it's never spliced.
+        // Instead, small slices are taken. They're taken in order because sequential memory accesses are fastest.
+        var remaining = child.lines.length % 25 + 25
+        for (var pos = remaining; pos < child.lines.length;) {
+          var leaf = new LeafChunk(child.lines.slice(pos, pos += 25))
+          child.height -= leaf.height
+          this$1.children.splice(++i, 0, leaf)
+          leaf.parent = this$1
+        }
+        child.lines = child.lines.slice(0, remaining)
+        this$1.maybeSpill()
+      }
+      break
+    }
+    at -= sz
+  }
+};
+
+// When a node has grown, check whether it should be split.
+BranchChunk.prototype.maybeSpill = function () {
+  if (this.children.length <= 10) { return }
+  var me = this
+  do {
+    var spilled = me.children.splice(me.children.length - 5, 5)
+    var sibling = new BranchChunk(spilled)
+    if (!me.parent) { // Become the parent node
+      var copy = new BranchChunk(me.children)
+      copy.parent = me
+      me.children = [copy, sibling]
+      me = copy
+   } else {
+      me.size -= sibling.size
+      me.height -= sibling.height
+      var myIndex = indexOf(me.parent.children, me)
+      me.parent.children.splice(myIndex + 1, 0, sibling)
+    }
+    sibling.parent = me.parent
+  } while (me.children.length > 10)
+  me.parent.maybeSpill()
+};
+
+BranchChunk.prototype.iterN = function (at, n, op) {
+    var this$1 = this;
+
+  for (var i = 0; i < this.children.length; ++i) {
+    var child = this$1.children[i], sz = child.chunkSize()
+    if (at < sz) {
+      var used = Math.min(n, sz - at)
+      if (child.iterN(at, used, op)) { return true }
+      if ((n -= used) == 0) { break }
+      at = 0
+    } else { at -= sz }
+  }
+};
+
+// Line widgets are block elements displayed above or below a line.
+
+var LineWidget = function(doc, node, options) {
+  var this$1 = this;
+
+  if (options) { for (var opt in options) { if (options.hasOwnProperty(opt))
+    { this$1[opt] = options[opt] } } }
+  this.doc = doc
+  this.node = node
+};
+
+LineWidget.prototype.clear = function () {
+    var this$1 = this;
+
+  var cm = this.doc.cm, ws = this.line.widgets, line = this.line, no = lineNo(line)
+  if (no == null || !ws) { return }
+  for (var i = 0; i < ws.length; ++i) { if (ws[i] == this$1) { ws.splice(i--, 1) } }
+  if (!ws.length) { line.widgets = null }
+  var height = widgetHeight(this)
+  updateLineHeight(line, Math.max(0, line.height - height))
+  if (cm) {
+    runInOp(cm, function () {
+      adjustScrollWhenAboveVisible(cm, line, -height)
+      regLineChange(cm, no, "widget")
+    })
+    signalLater(cm, "lineWidgetCleared", cm, this, no)
+  }
+};
+
+LineWidget.prototype.changed = function () {
+    var this$1 = this;
+
+  var oldH = this.height, cm = this.doc.cm, line = this.line
+  this.height = null
+  var diff = widgetHeight(this) - oldH
+  if (!diff) { return }
+  updateLineHeight(line, line.height + diff)
+  if (cm) {
+    runInOp(cm, function () {
+      cm.curOp.forceUpdate = true
+      adjustScrollWhenAboveVisible(cm, line, diff)
+      signalLater(cm, "lineWidgetChanged", cm, this$1, lineNo(line))
+    })
+  }
+};
+eventMixin(LineWidget)
+
+function adjustScrollWhenAboveVisible(cm, line, diff) {
+  if (heightAtLine(line) < ((cm.curOp && cm.curOp.scrollTop) || cm.doc.scrollTop))
+    { addToScrollPos(cm, null, diff) }
+}
+
+function addLineWidget(doc, handle, node, options) {
+  var widget = new LineWidget(doc, node, options)
+  var cm = doc.cm
+  if (cm && widget.noHScroll) { cm.display.alignWidgets = true }
+  changeLine(doc, handle, "widget", function (line) {
+    var widgets = line.widgets || (line.widgets = [])
+    if (widget.insertAt == null) { widgets.push(widget) }
+    else { widgets.splice(Math.min(widgets.length - 1, Math.max(0, widget.insertAt)), 0, widget) }
+    widget.line = line
+    if (cm && !lineIsHidden(doc, line)) {
+      var aboveVisible = heightAtLine(line) < doc.scrollTop
+      updateLineHeight(line, line.height + widgetHeight(widget))
+      if (aboveVisible) { addToScrollPos(cm, null, widget.height) }
+      cm.curOp.forceUpdate = true
+    }
+    return true
+  })
+  signalLater(cm, "lineWidgetAdded", cm, widget, typeof handle == "number" ? handle : lineNo(handle))
+  return widget
+}
+
+// TEXTMARKERS
+
+// Created with markText and setBookmark methods. A TextMarker is a
+// handle that can be used to clear or find a marked position in the
+// document. Line objects hold arrays (markedSpans) containing
+// {from, to, marker} object pointing to such marker objects, and
+// indicating that such a marker is present on that line. Multiple
+// lines may point to the same marker when it spans across lines.
+// The spans will have null for their from/to properties when the
+// marker continues beyond the start/end of the line. Markers have
+// links back to the lines they currently touch.
+
+// Collapsed markers have unique ids, in order to be able to order
+// them, which is needed for uniquely determining an outer marker
+// when they overlap (they may nest, but not partially overlap).
+var nextMarkerId = 0
+
+var TextMarker = function(doc, type) {
+  this.lines = []
+  this.type = type
+  this.doc = doc
+  this.id = ++nextMarkerId
+};
+
+// Clear the marker.
+TextMarker.prototype.clear = function () {
+    var this$1 = this;
+
+  if (this.explicitlyCleared) { return }
+  var cm = this.doc.cm, withOp = cm && !cm.curOp
+  if (withOp) { startOperation(cm) }
+  if (hasHandler(this, "clear")) {
+    var found = this.find()
+    if (found) { signalLater(this, "clear", found.from, found.to) }
+  }
+  var min = null, max = null
+  for (var i = 0; i < this.lines.length; ++i) {
+    var line = this$1.lines[i]
+    var span = getMarkedSpanFor(line.markedSpans, this$1)
+    if (cm && !this$1.collapsed) { regLineChange(cm, lineNo(line), "text") }
+    else if (cm) {
+      if (span.to != null) { max = lineNo(line) }
+      if (span.from != null) { min = lineNo(line) }
+    }
+    line.markedSpans = removeMarkedSpan(line.markedSpans, span)
+    if (span.from == null && this$1.collapsed && !lineIsHidden(this$1.doc, line) && cm)
+      { updateLineHeight(line, textHeight(cm.display)) }
+  }
+  if (cm && this.collapsed && !cm.options.lineWrapping) { for (var i$1 = 0; i$1 < this.lines.length; ++i$1) {
+    var visual = visualLine(this$1.lines[i$1]), len = lineLength(visual)
+    if (len > cm.display.maxLineLength) {
+      cm.display.maxLine = visual
+      cm.display.maxLineLength = len
+      cm.display.maxLineChanged = true
+    }
+  } }
+
+  if (min != null && cm && this.collapsed) { regChange(cm, min, max + 1) }
+  this.lines.length = 0
+  this.explicitlyCleared = true
+  if (this.atomic && this.doc.cantEdit) {
+    this.doc.cantEdit = false
+    if (cm) { reCheckSelection(cm.doc) }
+  }
+  if (cm) { signalLater(cm, "markerCleared", cm, this, min, max) }
+  if (withOp) { endOperation(cm) }
+  if (this.parent) { this.parent.clear() }
+};
+
+// Find the position of the marker in the document. Returns a {from,
+// to} object by default. Side can be passed to get a specific side
+// -- 0 (both), -1 (left), or 1 (right). When lineObj is true, the
+// Pos objects returned contain a line object, rather than a line
+// number (used to prevent looking up the same line twice).
+TextMarker.prototype.find = function (side, lineObj) {
+    var this$1 = this;
+
+  if (side == null && this.type == "bookmark") { side = 1 }
+  var from, to
+  for (var i = 0; i < this.lines.length; ++i) {
+    var line = this$1.lines[i]
+    var span = getMarkedSpanFor(line.markedSpans, this$1)
+    if (span.from != null) {
+      from = Pos(lineObj ? line : lineNo(line), span.from)
+      if (side == -1) { return from }
+    }
+    if (span.to != null) {
+      to = Pos(lineObj ? line : lineNo(line), span.to)
+      if (side == 1) { return to }
+    }
+  }
+  return from && {from: from, to: to}
+};
+
+// Signals that the marker's widget changed, and surrounding layout
+// should be recomputed.
+TextMarker.prototype.changed = function () {
+    var this$1 = this;
+
+  var pos = this.find(-1, true), widget = this, cm = this.doc.cm
+  if (!pos || !cm) { return }
+  runInOp(cm, function () {
+    var line = pos.line, lineN = lineNo(pos.line)
+    var view = findViewForLine(cm, lineN)
+    if (view) {
+      clearLineMeasurementCacheFor(view)
+      cm.curOp.selectionChanged = cm.curOp.forceUpdate = true
+    }
+    cm.curOp.updateMaxLine = true
+    if (!lineIsHidden(widget.doc, line) && widget.height != null) {
+      var oldHeight = widget.height
+      widget.height = null
+      var dHeight = widgetHeight(widget) - oldHeight
+      if (dHeight)
+        { updateLineHeight(line, line.height + dHeight) }
+    }
+    signalLater(cm, "markerChanged", cm, this$1)
+  })
+};
+
+TextMarker.prototype.attachLine = function (line) {
+  if (!this.lines.length && this.doc.cm) {
+    var op = this.doc.cm.curOp
+    if (!op.maybeHiddenMarkers || indexOf(op.maybeHiddenMarkers, this) == -1)
+      { (op.maybeUnhiddenMarkers || (op.maybeUnhiddenMarkers = [])).push(this) }
+  }
+  this.lines.push(line)
+};
+
+TextMarker.prototype.detachLine = function (line) {
+  this.lines.splice(indexOf(this.lines, line), 1)
+  if (!this.lines.length && this.doc.cm) {
+    var op = this.doc.cm.curOp
+    ;(op.maybeHiddenMarkers || (op.maybeHiddenMarkers = [])).push(this)
+  }
+};
+eventMixin(TextMarker)
+
+// Create a marker, wire it up to the right lines, and
+function markText(doc, from, to, options, type) {
+  // Shared markers (across linked documents) are handled separately
+  // (markTextShared will call out to this again, once per
+  // document).
+  if (options && options.shared) { return markTextShared(doc, from, to, options, type) }
+  // Ensure we are in an operation.
+  if (doc.cm && !doc.cm.curOp) { return operation(doc.cm, markText)(doc, from, to, options, type) }
+
+  var marker = new TextMarker(doc, type), diff = cmp(from, to)
+  if (options) { copyObj(options, marker, false) }
+  // Don't connect empty markers unless clearWhenEmpty is false
+  if (diff > 0 || diff == 0 && marker.clearWhenEmpty !== false)
+    { return marker }
+  if (marker.replacedWith) {
+    // Showing up as a widget implies collapsed (widget replaces text)
+    marker.collapsed = true
+    marker.widgetNode = eltP("span", [marker.replacedWith], "CodeMirror-widget")
+    if (!options.handleMouseEvents) { marker.widgetNode.setAttribute("cm-ignore-events", "true") }
+    if (options.insertLeft) { marker.widgetNode.insertLeft = true }
+  }
+  if (marker.collapsed) {
+    if (conflictingCollapsedRange(doc, from.line, from, to, marker) ||
+        from.line != to.line && conflictingCollapsedRange(doc, to.line, from, to, marker))
+      { throw new Error("Inserting collapsed marker partially overlapping an existing one") }
+    seeCollapsedSpans()
+  }
+
+  if (marker.addToHistory)
+    { addChangeToHistory(doc, {from: from, to: to, origin: "markText"}, doc.sel, NaN) }
+
+  var curLine = from.line, cm = doc.cm, updateMaxLine
+  doc.iter(curLine, to.line + 1, function (line) {
+    if (cm && marker.collapsed && !cm.options.lineWrapping && visualLine(line) == cm.display.maxLine)
+      { updateMaxLine = true }
+    if (marker.collapsed && curLine != from.line) { updateLineHeight(line, 0) }
+    addMarkedSpan(line, new MarkedSpan(marker,
+                                       curLine == from.line ? from.ch : null,
+                                       curLine == to.line ? to.ch : null))
+    ++curLine
+  })
+  // lineIsHidden depends on the presence of the spans, so needs a second pass
+  if (marker.collapsed) { doc.iter(from.line, to.line + 1, function (line) {
+    if (lineIsHidden(doc, line)) { updateLineHeight(line, 0) }
+  }) }
+
+  if (marker.clearOnEnter) { on(marker, "beforeCursorEnter", function () { return marker.clear(); }) }
+
+  if (marker.readOnly) {
+    seeReadOnlySpans()
+    if (doc.history.done.length || doc.history.undone.length)
+      { doc.clearHistory() }
+  }
+  if (marker.collapsed) {
+    marker.id = ++nextMarkerId
+    marker.atomic = true
+  }
+  if (cm) {
+    // Sync editor state
+    if (updateMaxLine) { cm.curOp.updateMaxLine = true }
+    if (marker.collapsed)
+      { regChange(cm, from.line, to.line + 1) }
+    else if (marker.className || marker.title || marker.startStyle || marker.endStyle || marker.css)
+      { for (var i = from.line; i <= to.line; i++) { regLineChange(cm, i, "text") } }
+    if (marker.atomic) { reCheckSelection(cm.doc) }
+    signalLater(cm, "markerAdded", cm, marker)
+  }
+  return marker
+}
+
+// SHARED TEXTMARKERS
+
+// A shared marker spans multiple linked documents. It is
+// implemented as a meta-marker-object controlling multiple normal
+// markers.
+var SharedTextMarker = function(markers, primary) {
+  var this$1 = this;
+
+  this.markers = markers
+  this.primary = primary
+  for (var i = 0; i < markers.length; ++i)
+    { markers[i].parent = this$1 }
+};
+
+SharedTextMarker.prototype.clear = function () {
+    var this$1 = this;
+
+  if (this.explicitlyCleared) { return }
+  this.explicitlyCleared = true
+  for (var i = 0; i < this.markers.length; ++i)
+    { this$1.markers[i].clear() }
+  signalLater(this, "clear")
+};
+
+SharedTextMarker.prototype.find = function (side, lineObj) {
+  return this.primary.find(side, lineObj)
+};
+eventMixin(SharedTextMarker)
+
+function markTextShared(doc, from, to, options, type) {
+  options = copyObj(options)
+  options.shared = false
+  var markers = [markText(doc, from, to, options, type)], primary = markers[0]
+  var widget = options.widgetNode
+  linkedDocs(doc, function (doc) {
+    if (widget) { options.widgetNode = widget.cloneNode(true) }
+    markers.push(markText(doc, clipPos(doc, from), clipPos(doc, to), options, type))
+    for (var i = 0; i < doc.linked.length; ++i)
+      { if (doc.linked[i].isParent) { return } }
+    primary = lst(markers)
+  })
+  return new SharedTextMarker(markers, primary)
+}
+
+function findSharedMarkers(doc) {
+  return doc.findMarks(Pos(doc.first, 0), doc.clipPos(Pos(doc.lastLine())), function (m) { return m.parent; })
+}
+
+function copySharedMarkers(doc, markers) {
+  for (var i = 0; i < markers.length; i++) {
+    var marker = markers[i], pos = marker.find()
+    var mFrom = doc.clipPos(pos.from), mTo = doc.clipPos(pos.to)
+    if (cmp(mFrom, mTo)) {
+      var subMark = markText(doc, mFrom, mTo, marker.primary, marker.primary.type)
+      marker.markers.push(subMark)
+      subMark.parent = marker
+    }
+  }
+}
+
+function detachSharedMarkers(markers) {
+  var loop = function ( i ) {
+    var marker = markers[i], linked = [marker.primary.doc]
+    linkedDocs(marker.primary.doc, function (d) { return linked.push(d); })
+    for (var j = 0; j < marker.markers.length; j++) {
+      var subMarker = marker.markers[j]
+      if (indexOf(linked, subMarker.doc) == -1) {
+        subMarker.parent = null
+        marker.markers.splice(j--, 1)
+      }
+    }
+  };
+
+  for (var i = 0; i < markers.length; i++) loop( i );
+}
+
+var nextDocId = 0
+var Doc = function(text, mode, firstLine, lineSep, direction) {
+  if (!(this instanceof Doc)) { return new Doc(text, mode, firstLine, lineSep, direction) }
+  if (firstLine == null) { firstLine = 0 }
+
+  BranchChunk.call(this, [new LeafChunk([new Line("", null)])])
+  this.first = firstLine
+  this.scrollTop = this.scrollLeft = 0
+  this.cantEdit = false
+  this.cleanGeneration = 1
+  this.frontier = firstLine
+  var start = Pos(firstLine, 0)
+  this.sel = simpleSelection(start)
+  this.history = new History(null)
+  this.id = ++nextDocId
+  this.modeOption = mode
+  this.lineSep = lineSep
+  this.direction = (direction == "rtl") ? "rtl" : "ltr"
+  this.extend = false
+
+  if (typeof text == "string") { text = this.splitLines(text) }
+  updateDoc(this, {from: start, to: start, text: text})
+  setSelection(this, simpleSelection(start), sel_dontScroll)
+}
+
+Doc.prototype = createObj(BranchChunk.prototype, {
+  constructor: Doc,
+  // Iterate over the document. Supports two forms -- with only one
+  // argument, it calls that for each line in the document. With
+  // three, it iterates over the range given by the first two (with
+  // the second being non-inclusive).
+  iter: function(from, to, op) {
+    if (op) { this.iterN(from - this.first, to - from, op) }
+    else { this.iterN(this.first, this.first + this.size, from) }
+  },
+
+  // Non-public interface for adding and removing lines.
+  insert: function(at, lines) {
+    var height = 0
+    for (var i = 0; i < lines.length; ++i) { height += lines[i].height }
+    this.insertInner(at - this.first, lines, height)
+  },
+  remove: function(at, n) { this.removeInner(at - this.first, n) },
+
+  // From here, the methods are part of the public interface. Most
+  // are also available from CodeMirror (editor) instances.
+
+  getValue: function(lineSep) {
+    var lines = getLines(this, this.first, this.first + this.size)
+    if (lineSep === false) { return lines }
+    return lines.join(lineSep || this.lineSeparator())
+  },
+  setValue: docMethodOp(function(code) {
+    var top = Pos(this.first, 0), last = this.first + this.size - 1
+    makeChange(this, {from: top, to: Pos(last, getLine(this, last).text.length),
+                      text: this.splitLines(code), origin: "setValue", full: true}, true)
+    if (this.cm) { this.cm.scrollTo(0, 0) }
+    setSelection(this, simpleSelection(top), sel_dontScroll)
+  }),
+  replaceRange: function(code, from, to, origin) {
+    from = clipPos(this, from)
+    to = to ? clipPos(this, to) : from
+    replaceRange(this, code, from, to, origin)
+  },
+  getRange: function(from, to, lineSep) {
+    var lines = getBetween(this, clipPos(this, from), clipPos(this, to))
+    if (lineSep === false) { return lines }
+    return lines.join(lineSep || this.lineSeparator())
+  },
+
+  getLine: function(line) {var l = this.getLineHandle(line); return l && l.text},
+
+  getLineHandle: function(line) {if (isLine(this, line)) { return getLine(this, line) }},
+  getLineNumber: function(line) {return lineNo(line)},
+
+  getLineHandleVisualStart: function(line) {
+    if (typeof line == "number") { line = getLine(this, line) }
+    return visualLine(line)
+  },
+
+  lineCount: function() {return this.size},
+  firstLine: function() {return this.first},
+  lastLine: function() {return this.first + this.size - 1},
+
+  clipPos: function(pos) {return clipPos(this, pos)},
+
+  getCursor: function(start) {
+    var range = this.sel.primary(), pos
+    if (start == null || start == "head") { pos = range.head }
+    else if (start == "anchor") { pos = range.anchor }
+    else if (start == "end" || start == "to" || start === false) { pos = range.to() }
+    else { pos = range.from() }
+    return pos
+  },
+  listSelections: function() { return this.sel.ranges },
+  somethingSelected: function() {return this.sel.somethingSelected()},
+
+  setCursor: docMethodOp(function(line, ch, options) {
+    setSimpleSelection(this, clipPos(this, typeof line == "number" ? Pos(line, ch || 0) : line), null, options)
+  }),
+  setSelection: docMethodOp(function(anchor, head, options) {
+    setSimpleSelection(this, clipPos(this, anchor), clipPos(this, head || anchor), options)
+  }),
+  extendSelection: docMethodOp(function(head, other, options) {
+    extendSelection(this, clipPos(this, head), other && clipPos(this, other), options)
+  }),
+  extendSelections: docMethodOp(function(heads, options) {
+    extendSelections(this, clipPosArray(this, heads), options)
+  }),
+  extendSelectionsBy: docMethodOp(function(f, options) {
+    var heads = map(this.sel.ranges, f)
+    extendSelections(this, clipPosArray(this, heads), options)
+  }),
+  setSelections: docMethodOp(function(ranges, primary, options) {
+    var this$1 = this;
+
+    if (!ranges.length) { return }
+    var out = []
+    for (var i = 0; i < ranges.length; i++)
+      { out[i] = new Range(clipPos(this$1, ranges[i].anchor),
+                         clipPos(this$1, ranges[i].head)) }
+    if (primary == null) { primary = Math.min(ranges.length - 1, this.sel.primIndex) }
+    setSelection(this, normalizeSelection(out, primary), options)
+  }),
+  addSelection: docMethodOp(function(anchor, head, options) {
+    var ranges = this.sel.ranges.slice(0)
+    ranges.push(new Range(clipPos(this, anchor), clipPos(this, head || anchor)))
+    setSelection(this, normalizeSelection(ranges, ranges.length - 1), options)
+  }),
+
+  getSelection: function(lineSep) {
+    var this$1 = this;
+
+    var ranges = this.sel.ranges, lines
+    for (var i = 0; i < ranges.length; i++) {
+      var sel = getBetween(this$1, ranges[i].from(), ranges[i].to())
+      lines = lines ? lines.concat(sel) : sel
+    }
+    if (lineSep === false) { return lines }
+    else { return lines.join(lineSep || this.lineSeparator()) }
+  },
+  getSelections: function(lineSep) {
+    var this$1 = this;
+
+    var parts = [], ranges = this.sel.ranges
+    for (var i = 0; i < ranges.length; i++) {
+      var sel = getBetween(this$1, ranges[i].from(), ranges[i].to())
+      if (lineSep !== false) { sel = sel.join(lineSep || this$1.lineSeparator()) }
+      parts[i] = sel
+    }
+    return parts
+  },
+  replaceSelection: function(code, collapse, origin) {
+    var dup = []
+    for (var i = 0; i < this.sel.ranges.length; i++)
+      { dup[i] = code }
+    this.replaceSelections(dup, collapse, origin || "+input")
+  },
+  replaceSelections: docMethodOp(function(code, collapse, origin) {
+    var this$1 = this;
+
+    var changes = [], sel = this.sel
+    for (var i = 0; i < sel.ranges.length; i++) {
+      var range = sel.ranges[i]
+      changes[i] = {from: range.from(), to: range.to(), text: this$1.splitLines(code[i]), origin: origin}
+    }
+    var newSel = collapse && collapse != "end" && computeReplacedSel(this, changes, collapse)
+    for (var i$1 = changes.length - 1; i$1 >= 0; i$1--)
+      { makeChange(this$1, changes[i$1]) }
+    if (newSel) { setSelectionReplaceHistory(this, newSel) }
+    else if (this.cm) { ensureCursorVisible(this.cm) }
+  }),
+  undo: docMethodOp(function() {makeChangeFromHistory(this, "undo")}),
+  redo: docMethodOp(function() {makeChangeFromHistory(this, "redo")}),
+  undoSelection: docMethodOp(function() {makeChangeFromHistory(this, "undo", true)}),
+  redoSelection: docMethodOp(function() {makeChangeFromHistory(this, "redo", true)}),
+
+  setExtending: function(val) {this.extend = val},
+  getExtending: function() {return this.extend},
+
+  historySize: function() {
+    var hist = this.history, done = 0, undone = 0
+    for (var i = 0; i < hist.done.length; i++) { if (!hist.done[i].ranges) { ++done } }
+    for (var i$1 = 0; i$1 < hist.undone.length; i$1++) { if (!hist.undone[i$1].ranges) { ++undone } }
+    return {undo: done, redo: undone}
+  },
+  clearHistory: function() {this.history = new History(this.history.maxGeneration)},
+
+  markClean: function() {
+    this.cleanGeneration = this.changeGeneration(true)
+  },
+  changeGeneration: function(forceSplit) {
+    if (forceSplit)
+      { this.history.lastOp = this.history.lastSelOp = this.history.lastOrigin = null }
+    return this.history.generation
+  },
+  isClean: function (gen) {
+    return this.history.generation == (gen || this.cleanGeneration)
+  },
+
+  getHistory: function() {
+    return {done: copyHistoryArray(this.history.done),
+            undone: copyHistoryArray(this.history.undone)}
+  },
+  setHistory: function(histData) {
+    var hist = this.history = new History(this.history.maxGeneration)
+    hist.done = copyHistoryArray(histData.done.slice(0), null, true)
+    hist.undone = copyHistoryArray(histData.undone.slice(0), null, true)
+  },
+
+  setGutterMarker: docMethodOp(function(line, gutterID, value) {
+    return changeLine(this, line, "gutter", function (line) {
+      var markers = line.gutterMarkers || (line.gutterMarkers = {})
+      markers[gutterID] = value
+      if (!value && isEmpty(markers)) { line.gutterMarkers = null }
+      return true
+    })
+  }),
+
+  clearGutter: docMethodOp(function(gutterID) {
+    var this$1 = this;
+
+    this.iter(function (line) {
+      if (line.gutterMarkers && line.gutterMarkers[gutterID]) {
+        changeLine(this$1, line, "gutter", function () {
+          line.gutterMarkers[gutterID] = null
+          if (isEmpty(line.gutterMarkers)) { line.gutterMarkers = null }
+          return true
+        })
+      }
+    })
+  }),
+
+  lineInfo: function(line) {
+    var n
+    if (typeof line == "number") {
+      if (!isLine(this, line)) { return null }
+      n = line
+      line = getLine(this, line)
+      if (!line) { return null }
     } else {
-      setSelection(doc, pos, other || pos, bias);
+      n = lineNo(line)
+      if (n == null) { return null }
     }
-    if (doc.cm) doc.cm.curOp.userSelChange = true;
-  }
+    return {line: n, handle: line, text: line.text, gutterMarkers: line.gutterMarkers,
+            textClass: line.textClass, bgClass: line.bgClass, wrapClass: line.wrapClass,
+            widgets: line.widgets}
+  },
 
-  function filterSelectionChange(doc, anchor, head) {
-    var obj = {anchor: anchor, head: head};
-    signal(doc, "beforeSelectionChange", doc, obj);
-    if (doc.cm) signal(doc.cm, "beforeSelectionChange", doc.cm, obj);
-    obj.anchor = clipPos(doc, obj.anchor); obj.head = clipPos(doc, obj.head);
-    return obj;
-  }
+  addLineClass: docMethodOp(function(handle, where, cls) {
+    return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function (line) {
+      var prop = where == "text" ? "textClass"
+               : where == "background" ? "bgClass"
+               : where == "gutter" ? "gutterClass" : "wrapClass"
+      if (!line[prop]) { line[prop] = cls }
+      else if (classTest(cls).test(line[prop])) { return false }
+      else { line[prop] += " " + cls }
+      return true
+    })
+  }),
+  removeLineClass: docMethodOp(function(handle, where, cls) {
+    return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function (line) {
+      var prop = where == "text" ? "textClass"
+               : where == "background" ? "bgClass"
+               : where == "gutter" ? "gutterClass" : "wrapClass"
+      var cur = line[prop]
+      if (!cur) { return false }
+      else if (cls == null) { line[prop] = null }
+      else {
+        var found = cur.match(classTest(cls))
+        if (!found) { return false }
+        var end = found.index + found[0].length
+        line[prop] = cur.slice(0, found.index) + (!found.index || end == cur.length ? "" : " ") + cur.slice(end) || null
+      }
+      return true
+    })
+  }),
 
-  // Update the selection. Last two args are only used by
-  // updateDoc, since they have to be expressed in the line
-  // numbers before the update.
-  function setSelection(doc, anchor, head, bias, checkAtomic) {
-    if (!checkAtomic && hasHandler(doc, "beforeSelectionChange") || doc.cm && hasHandler(doc.cm, "beforeSelectionChange")) {
-      var filtered = filterSelectionChange(doc, anchor, head);
-      head = filtered.head;
-      anchor = filtered.anchor;
+  addLineWidget: docMethodOp(function(handle, node, options) {
+    return addLineWidget(this, handle, node, options)
+  }),
+  removeLineWidget: function(widget) { widget.clear() },
+
+  markText: function(from, to, options) {
+    return markText(this, clipPos(this, from), clipPos(this, to), options, options && options.type || "range")
+  },
+  setBookmark: function(pos, options) {
+    var realOpts = {replacedWith: options && (options.nodeType == null ? options.widget : options),
+                    insertLeft: options && options.insertLeft,
+                    clearWhenEmpty: false, shared: options && options.shared,
+                    handleMouseEvents: options && options.handleMouseEvents}
+    pos = clipPos(this, pos)
+    return markText(this, pos, pos, realOpts, "bookmark")
+  },
+  findMarksAt: function(pos) {
+    pos = clipPos(this, pos)
+    var markers = [], spans = getLine(this, pos.line).markedSpans
+    if (spans) { for (var i = 0; i < spans.length; ++i) {
+      var span = spans[i]
+      if ((span.from == null || span.from <= pos.ch) &&
+          (span.to == null || span.to >= pos.ch))
+        { markers.push(span.marker.parent || span.marker) }
+    } }
+    return markers
+  },
+  findMarks: function(from, to, filter) {
+    from = clipPos(this, from); to = clipPos(this, to)
+    var found = [], lineNo = from.line
+    this.iter(from.line, to.line + 1, function (line) {
+      var spans = line.markedSpans
+      if (spans) { for (var i = 0; i < spans.length; i++) {
+        var span = spans[i]
+        if (!(span.to != null && lineNo == from.line && from.ch >= span.to ||
+              span.from == null && lineNo != from.line ||
+              span.from != null && lineNo == to.line && span.from >= to.ch) &&
+            (!filter || filter(span.marker)))
+          { found.push(span.marker.parent || span.marker) }
+      } }
+      ++lineNo
+    })
+    return found
+  },
+  getAllMarks: function() {
+    var markers = []
+    this.iter(function (line) {
+      var sps = line.markedSpans
+      if (sps) { for (var i = 0; i < sps.length; ++i)
+        { if (sps[i].from != null) { markers.push(sps[i].marker) } } }
+    })
+    return markers
+  },
+
+  posFromIndex: function(off) {
+    var ch, lineNo = this.first, sepSize = this.lineSeparator().length
+    this.iter(function (line) {
+      var sz = line.text.length + sepSize
+      if (sz > off) { ch = off; return true }
+      off -= sz
+      ++lineNo
+    })
+    return clipPos(this, Pos(lineNo, ch))
+  },
+  indexFromPos: function (coords) {
+    coords = clipPos(this, coords)
+    var index = coords.ch
+    if (coords.line < this.first || coords.ch < 0) { return 0 }
+    var sepSize = this.lineSeparator().length
+    this.iter(this.first, coords.line, function (line) { // iter aborts when callback returns a truthy value
+      index += line.text.length + sepSize
+    })
+    return index
+  },
+
+  copy: function(copyHistory) {
+    var doc = new Doc(getLines(this, this.first, this.first + this.size),
+                      this.modeOption, this.first, this.lineSep, this.direction)
+    doc.scrollTop = this.scrollTop; doc.scrollLeft = this.scrollLeft
+    doc.sel = this.sel
+    doc.extend = false
+    if (copyHistory) {
+      doc.history.undoDepth = this.history.undoDepth
+      doc.setHistory(this.getHistory())
     }
+    return doc
+  },
 
-    var sel = doc.sel;
-    sel.goalColumn = null;
-    // Skip over atomic spans.
-    if (checkAtomic || !posEq(anchor, sel.anchor))
-      anchor = skipAtomic(doc, anchor, bias, checkAtomic != "push");
-    if (checkAtomic || !posEq(head, sel.head))
-      head = skipAtomic(doc, head, bias, checkAtomic != "push");
+  linkedDoc: function(options) {
+    if (!options) { options = {} }
+    var from = this.first, to = this.first + this.size
+    if (options.from != null && options.from > from) { from = options.from }
+    if (options.to != null && options.to < to) { to = options.to }
+    var copy = new Doc(getLines(this, from, to), options.mode || this.modeOption, from, this.lineSep, this.direction)
+    if (options.sharedHist) { copy.history = this.history
+    ; }(this.linked || (this.linked = [])).push({doc: copy, sharedHist: options.sharedHist})
+    copy.linked = [{doc: this, isParent: true, sharedHist: options.sharedHist}]
+    copySharedMarkers(copy, findSharedMarkers(this))
+    return copy
+  },
+  unlinkDoc: function(other) {
+    var this$1 = this;
 
-    if (posEq(sel.anchor, anchor) && posEq(sel.head, head)) return;
+    if (other instanceof CodeMirror) { other = other.doc }
+    if (this.linked) { for (var i = 0; i < this.linked.length; ++i) {
+      var link = this$1.linked[i]
+      if (link.doc != other) { continue }
+      this$1.linked.splice(i, 1)
+      other.unlinkDoc(this$1)
+      detachSharedMarkers(findSharedMarkers(this$1))
+      break
+    } }
+    // If the histories were shared, split them again
+    if (other.history == this.history) {
+      var splitIds = [other.id]
+      linkedDocs(other, function (doc) { return splitIds.push(doc.id); }, true)
+      other.history = new History(null)
+      other.history.done = copyHistoryArray(this.history.done, splitIds)
+      other.history.undone = copyHistoryArray(this.history.undone, splitIds)
+    }
+  },
+  iterLinkedDocs: function(f) {linkedDocs(this, f)},
 
-    sel.anchor = anchor; sel.head = head;
-    var inv = posLess(head, anchor);
-    sel.from = inv ? head : anchor;
-    sel.to = inv ? anchor : head;
+  getMode: function() {return this.mode},
+  getEditor: function() {return this.cm},
 
-    if (doc.cm)
-      doc.cm.curOp.updateInput = doc.cm.curOp.selectionChanged =
-        doc.cm.curOp.cursorActivity = true;
+  splitLines: function(str) {
+    if (this.lineSep) { return str.split(this.lineSep) }
+    return splitLinesAuto(str)
+  },
+  lineSeparator: function() { return this.lineSep || "\n" },
 
-    signalLater(doc, "cursorActivity", doc);
+  setDirection: docMethodOp(function (dir) {
+    if (dir != "rtl") { dir = "ltr" }
+    if (dir == this.direction) { return }
+    this.direction = dir
+    this.iter(function (line) { return line.order = null; })
+    if (this.cm) { directionChanged(this.cm) }
+  })
+})
+
+// Public alias.
+Doc.prototype.eachLine = Doc.prototype.iter
+
+// Kludge to work around strange IE behavior where it'll sometimes
+// re-fire a series of drag-related events right after the drop (#1551)
+var lastDrop = 0
+
+function onDrop(e) {
+  var cm = this
+  clearDragCursor(cm)
+  if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e))
+    { return }
+  e_preventDefault(e)
+  if (ie) { lastDrop = +new Date }
+  var pos = posFromMouse(cm, e, true), files = e.dataTransfer.files
+  if (!pos || cm.isReadOnly()) { return }
+  // Might be a file drop, in which case we simply extract the text
+  // and insert it.
+  if (files && files.length && window.FileReader && window.File) {
+    var n = files.length, text = Array(n), read = 0
+    var loadFile = function (file, i) {
+      if (cm.options.allowDropFileTypes &&
+          indexOf(cm.options.allowDropFileTypes, file.type) == -1)
+        { return }
+
+      var reader = new FileReader
+      reader.onload = operation(cm, function () {
+        var content = reader.result
+        if (/[\x00-\x08\x0e-\x1f]{2}/.test(content)) { content = "" }
+        text[i] = content
+        if (++read == n) {
+          pos = clipPos(cm.doc, pos)
+          var change = {from: pos, to: pos,
+                        text: cm.doc.splitLines(text.join(cm.doc.lineSeparator())),
+                        origin: "paste"}
+          makeChange(cm.doc, change)
+          setSelectionReplaceHistory(cm.doc, simpleSelection(pos, changeEnd(change)))
+        }
+      })
+      reader.readAsText(file)
+    }
+    for (var i = 0; i < n; ++i) { loadFile(files[i], i) }
+  } else { // Normal drop
+    // Don't do a replace if the drop happened inside of the selected text.
+    if (cm.state.draggingText && cm.doc.sel.contains(pos) > -1) {
+      cm.state.draggingText(e)
+      // Ensure the editor is re-focused
+      setTimeout(function () { return cm.display.input.focus(); }, 20)
+      return
+    }
+    try {
+      var text$1 = e.dataTransfer.getData("Text")
+      if (text$1) {
+        var selected
+        if (cm.state.draggingText && !cm.state.draggingText.copy)
+          { selected = cm.listSelections() }
+        setSelectionNoUndo(cm.doc, simpleSelection(pos, pos))
+        if (selected) { for (var i$1 = 0; i$1 < selected.length; ++i$1)
+          { replaceRange(cm.doc, "", selected[i$1].anchor, selected[i$1].head, "drag") } }
+        cm.replaceSelection(text$1, "around", "paste")
+        cm.display.input.focus()
+      }
+    }
+    catch(e){}
   }
+}
 
-  function reCheckSelection(cm) {
-    setSelection(cm.doc, cm.doc.sel.from, cm.doc.sel.to, null, "push");
+function onDragStart(cm, e) {
+  if (ie && (!cm.state.draggingText || +new Date - lastDrop < 100)) { e_stop(e); return }
+  if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) { return }
+
+  e.dataTransfer.setData("Text", cm.getSelection())
+  e.dataTransfer.effectAllowed = "copyMove"
+
+  // Use dummy image instead of default browsers image.
+  // Recent Safari (~6.0.2) have a tendency to segfault when this happens, so we don't do it there.
+  if (e.dataTransfer.setDragImage && !safari) {
+    var img = elt("img", null, null, "position: fixed; left: 0; top: 0;")
+    img.src = "data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw=="
+    if (presto) {
+      img.width = img.height = 1
+      cm.display.wrapper.appendChild(img)
+      // Force a relayout, or Opera won't use our image for some obscure reason
+      img._top = img.offsetTop
+    }
+    e.dataTransfer.setDragImage(img, 0, 0)
+    if (presto) { img.parentNode.removeChild(img) }
   }
+}
 
-  function skipAtomic(doc, pos, bias, mayClear) {
-    var flipped = false, curPos = pos;
-    var dir = bias || 1;
-    doc.cantEdit = false;
-    search: for (;;) {
-      var line = getLine(doc, curPos.line);
-      if (line.markedSpans) {
-        for (var i = 0; i < line.markedSpans.length; ++i) {
-          var sp = line.markedSpans[i], m = sp.marker;
-          if ((sp.from == null || (m.inclusiveLeft ? sp.from <= curPos.ch : sp.from < curPos.ch)) &&
-              (sp.to == null || (m.inclusiveRight ? sp.to >= curPos.ch : sp.to > curPos.ch))) {
-            if (mayClear) {
-              signal(m, "beforeCursorEnter");
-              if (m.explicitlyCleared) {
-                if (!line.markedSpans) break;
-                else {--i; continue;}
-              }
-            }
-            if (!m.atomic) continue;
-            var newPos = m.find()[dir < 0 ? "from" : "to"];
-            if (posEq(newPos, curPos)) {
-              newPos.ch += dir;
-              if (newPos.ch < 0) {
-                if (newPos.line > doc.first) newPos = clipPos(doc, Pos(newPos.line - 1));
-                else newPos = null;
-              } else if (newPos.ch > line.text.length) {
-                if (newPos.line < doc.first + doc.size - 1) newPos = Pos(newPos.line + 1, 0);
-                else newPos = null;
-              }
-              if (!newPos) {
-                if (flipped) {
-                  // Driven in a corner -- no valid cursor position found at all
-                  // -- try again *with* clearing, if we didn't already
-                  if (!mayClear) return skipAtomic(doc, pos, bias, true);
-                  // Otherwise, turn off editing until further notice, and return the start of the doc
-                  doc.cantEdit = true;
-                  return Pos(doc.first, 0);
-                }
-                flipped = true; newPos = pos; dir = -dir;
-              }
-            }
-            curPos = newPos;
-            continue search;
+function onDragOver(cm, e) {
+  var pos = posFromMouse(cm, e)
+  if (!pos) { return }
+  var frag = document.createDocumentFragment()
+  drawSelectionCursor(cm, pos, frag)
+  if (!cm.display.dragCursor) {
+    cm.display.dragCursor = elt("div", null, "CodeMirror-cursors CodeMirror-dragcursors")
+    cm.display.lineSpace.insertBefore(cm.display.dragCursor, cm.display.cursorDiv)
+  }
+  removeChildrenAndAdd(cm.display.dragCursor, frag)
+}
+
+function clearDragCursor(cm) {
+  if (cm.display.dragCursor) {
+    cm.display.lineSpace.removeChild(cm.display.dragCursor)
+    cm.display.dragCursor = null
+  }
+}
+
+// These must be handled carefully, because naively registering a
+// handler for each editor will cause the editors to never be
+// garbage collected.
+
+function forEachCodeMirror(f) {
+  if (!document.body.getElementsByClassName) { return }
+  var byClass = document.body.getElementsByClassName("CodeMirror")
+  for (var i = 0; i < byClass.length; i++) {
+    var cm = byClass[i].CodeMirror
+    if (cm) { f(cm) }
+  }
+}
+
+var globalsRegistered = false
+function ensureGlobalHandlers() {
+  if (globalsRegistered) { return }
+  registerGlobalHandlers()
+  globalsRegistered = true
+}
+function registerGlobalHandlers() {
+  // When the window resizes, we need to refresh active editors.
+  var resizeTimer
+  on(window, "resize", function () {
+    if (resizeTimer == null) { resizeTimer = setTimeout(function () {
+      resizeTimer = null
+      forEachCodeMirror(onResize)
+    }, 100) }
+  })
+  // When the window loses focus, we want to show the editor as blurred
+  on(window, "blur", function () { return forEachCodeMirror(onBlur); })
+}
+// Called when the window resizes
+function onResize(cm) {
+  var d = cm.display
+  if (d.lastWrapHeight == d.wrapper.clientHeight && d.lastWrapWidth == d.wrapper.clientWidth)
+    { return }
+  // Might be a text scaling operation, clear size caches.
+  d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null
+  d.scrollbarsClipped = false
+  cm.setSize()
+}
+
+var keyNames = {
+  3: "Enter", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",
+  19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",
+  36: "Home", 37: "Left", 38: "Up", 39: "Right", 40: "Down", 44: "PrintScrn", 45: "Insert",
+  46: "Delete", 59: ";", 61: "=", 91: "Mod", 92: "Mod", 93: "Mod",
+  106: "*", 107: "=", 109: "-", 110: ".", 111: "/", 127: "Delete",
+  173: "-", 186: ";", 187: "=", 188: ",", 189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\",
+  221: "]", 222: "'", 63232: "Up", 63233: "Down", 63234: "Left", 63235: "Right", 63272: "Delete",
+  63273: "Home", 63275: "End", 63276: "PageUp", 63277: "PageDown", 63302: "Insert"
+}
+
+// Number keys
+for (var i = 0; i < 10; i++) { keyNames[i + 48] = keyNames[i + 96] = String(i) }
+// Alphabetic keys
+for (var i$1 = 65; i$1 <= 90; i$1++) { keyNames[i$1] = String.fromCharCode(i$1) }
+// Function keys
+for (var i$2 = 1; i$2 <= 12; i$2++) { keyNames[i$2 + 111] = keyNames[i$2 + 63235] = "F" + i$2 }
+
+var keyMap = {}
+
+keyMap.basic = {
+  "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",
+  "End": "goLineEnd", "Home": "goLineStartSmart", "PageUp": "goPageUp", "PageDown": "goPageDown",
+  "Delete": "delCharAfter", "Backspace": "delCharBefore", "Shift-Backspace": "delCharBefore",
+  "Tab": "defaultTab", "Shift-Tab": "indentAuto",
+  "Enter": "newlineAndIndent", "Insert": "toggleOverwrite",
+  "Esc": "singleSelection"
+}
+// Note that the save and find-related commands aren't defined by
+// default. User code or addons can define them. Unknown commands
+// are simply ignored.
+keyMap.pcDefault = {
+  "Ctrl-A": "selectAll", "Ctrl-D": "deleteLine", "Ctrl-Z": "undo", "Shift-Ctrl-Z": "redo", "Ctrl-Y": "redo",
+  "Ctrl-Home": "goDocStart", "Ctrl-End": "goDocEnd", "Ctrl-Up": "goLineUp", "Ctrl-Down": "goLineDown",
+  "Ctrl-Left": "goGroupLeft", "Ctrl-Right": "goGroupRight", "Alt-Left": "goLineStart", "Alt-Right": "goLineEnd",
+  "Ctrl-Backspace": "delGroupBefore", "Ctrl-Delete": "delGroupAfter", "Ctrl-S": "save", "Ctrl-F": "find",
+  "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",
+  "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",
+  "Ctrl-U": "undoSelection", "Shift-Ctrl-U": "redoSelection", "Alt-U": "redoSelection",
+  fallthrough: "basic"
+}
+// Very basic readline/emacs-style bindings, which are standard on Mac.
+keyMap.emacsy = {
+  "Ctrl-F": "goCharRight", "Ctrl-B": "goCharLeft", "Ctrl-P": "goLineUp", "Ctrl-N": "goLineDown",
+  "Alt-F": "goWordRight", "Alt-B": "goWordLeft", "Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd",
+  "Ctrl-V": "goPageDown", "Shift-Ctrl-V": "goPageUp", "Ctrl-D": "delCharAfter", "Ctrl-H": "delCharBefore",
+  "Alt-D": "delWordAfter", "Alt-Backspace": "delWordBefore", "Ctrl-K": "killLine", "Ctrl-T": "transposeChars",
+  "Ctrl-O": "openLine"
+}
+keyMap.macDefault = {
+  "Cmd-A": "selectAll", "Cmd-D": "deleteLine", "Cmd-Z": "undo", "Shift-Cmd-Z": "redo", "Cmd-Y": "redo",
+  "Cmd-Home": "goDocStart", "Cmd-Up": "goDocStart", "Cmd-End": "goDocEnd", "Cmd-Down": "goDocEnd", "Alt-Left": "goGroupLeft",
+  "Alt-Right": "goGroupRight", "Cmd-Left": "goLineLeft", "Cmd-Right": "goLineRight", "Alt-Backspace": "delGroupBefore",
+  "Ctrl-Alt-Backspace": "delGroupAfter", "Alt-Delete": "delGroupAfter", "Cmd-S": "save", "Cmd-F": "find",
+  "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",
+  "Cmd-[": "indentLess", "Cmd-]": "indentMore", "Cmd-Backspace": "delWrappedLineLeft", "Cmd-Delete": "delWrappedLineRight",
+  "Cmd-U": "undoSelection", "Shift-Cmd-U": "redoSelection", "Ctrl-Up": "goDocStart", "Ctrl-Down": "goDocEnd",
+  fallthrough: ["basic", "emacsy"]
+}
+keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault
+
+// KEYMAP DISPATCH
+
+function normalizeKeyName(name) {
+  var parts = name.split(/-(?!$)/)
+  name = parts[parts.length - 1]
+  var alt, ctrl, shift, cmd
+  for (var i = 0; i < parts.length - 1; i++) {
+    var mod = parts[i]
+    if (/^(cmd|meta|m)$/i.test(mod)) { cmd = true }
+    else if (/^a(lt)?$/i.test(mod)) { alt = true }
+    else if (/^(c|ctrl|control)$/i.test(mod)) { ctrl = true }
+    else if (/^s(hift)?$/i.test(mod)) { shift = true }
+    else { throw new Error("Unrecognized modifier name: " + mod) }
+  }
+  if (alt) { name = "Alt-" + name }
+  if (ctrl) { name = "Ctrl-" + name }
+  if (cmd) { name = "Cmd-" + name }
+  if (shift) { name = "Shift-" + name }
+  return name
+}
+
+// This is a kludge to keep keymaps mostly working as raw objects
+// (backwards compatibility) while at the same time support features
+// like normalization and multi-stroke key bindings. It compiles a
+// new normalized keymap, and then updates the old object to reflect
+// this.
+function normalizeKeyMap(keymap) {
+  var copy = {}
+  for (var keyname in keymap) { if (keymap.hasOwnProperty(keyname)) {
+    var value = keymap[keyname]
+    if (/^(name|fallthrough|(de|at)tach)$/.test(keyname)) { continue }
+    if (value == "...") { delete keymap[keyname]; continue }
+
+    var keys = map(keyname.split(" "), normalizeKeyName)
+    for (var i = 0; i < keys.length; i++) {
+      var val = (void 0), name = (void 0)
+      if (i == keys.length - 1) {
+        name = keys.join(" ")
+        val = value
+      } else {
+        name = keys.slice(0, i + 1).join(" ")
+        val = "..."
+      }
+      var prev = copy[name]
+      if (!prev) { copy[name] = val }
+      else if (prev != val) { throw new Error("Inconsistent bindings for " + name) }
+    }
+    delete keymap[keyname]
+  } }
+  for (var prop in copy) { keymap[prop] = copy[prop] }
+  return keymap
+}
+
+function lookupKey(key, map, handle, context) {
+  map = getKeyMap(map)
+  var found = map.call ? map.call(key, context) : map[key]
+  if (found === false) { return "nothing" }
+  if (found === "...") { return "multi" }
+  if (found != null && handle(found)) { return "handled" }
+
+  if (map.fallthrough) {
+    if (Object.prototype.toString.call(map.fallthrough) != "[object Array]")
+      { return lookupKey(key, map.fallthrough, handle, context) }
+    for (var i = 0; i < map.fallthrough.length; i++) {
+      var result = lookupKey(key, map.fallthrough[i], handle, context)
+      if (result) { return result }
+    }
+  }
+}
+
+// Modifier key presses don't count as 'real' key presses for the
+// purpose of keymap fallthrough.
+function isModifierKey(value) {
+  var name = typeof value == "string" ? value : keyNames[value.keyCode]
+  return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod"
+}
+
+// Look up the name of a key as indicated by an event object.
+function keyName(event, noShift) {
+  if (presto && event.keyCode == 34 && event["char"]) { return false }
+  var base = keyNames[event.keyCode], name = base
+  if (name == null || event.altGraphKey) { return false }
+  if (event.altKey && base != "Alt") { name = "Alt-" + name }
+  if ((flipCtrlCmd ? event.metaKey : event.ctrlKey) && base != "Ctrl") { name = "Ctrl-" + name }
+  if ((flipCtrlCmd ? event.ctrlKey : event.metaKey) && base != "Cmd") { name = "Cmd-" + name }
+  if (!noShift && event.shiftKey && base != "Shift") { name = "Shift-" + name }
+  return name
+}
+
+function getKeyMap(val) {
+  return typeof val == "string" ? keyMap[val] : val
+}
+
+// Helper for deleting text near the selection(s), used to implement
+// backspace, delete, and similar functionality.
+function deleteNearSelection(cm, compute) {
+  var ranges = cm.doc.sel.ranges, kill = []
+  // Build up a set of ranges to kill first, merging overlapping
+  // ranges.
+  for (var i = 0; i < ranges.length; i++) {
+    var toKill = compute(ranges[i])
+    while (kill.length && cmp(toKill.from, lst(kill).to) <= 0) {
+      var replaced = kill.pop()
+      if (cmp(replaced.from, toKill.from) < 0) {
+        toKill.from = replaced.from
+        break
+      }
+    }
+    kill.push(toKill)
+  }
+  // Next, remove those actual ranges.
+  runInOp(cm, function () {
+    for (var i = kill.length - 1; i >= 0; i--)
+      { replaceRange(cm.doc, "", kill[i].from, kill[i].to, "+delete") }
+    ensureCursorVisible(cm)
+  })
+}
+
+// Commands are parameter-less actions that can be performed on an
+// editor, mostly used for keybindings.
+var commands = {
+  selectAll: selectAll,
+  singleSelection: function (cm) { return cm.setSelection(cm.getCursor("anchor"), cm.getCursor("head"), sel_dontScroll); },
+  killLine: function (cm) { return deleteNearSelection(cm, function (range) {
+    if (range.empty()) {
+      var len = getLine(cm.doc, range.head.line).text.length
+      if (range.head.ch == len && range.head.line < cm.lastLine())
+        { return {from: range.head, to: Pos(range.head.line + 1, 0)} }
+      else
+        { return {from: range.head, to: Pos(range.head.line, len)} }
+    } else {
+      return {from: range.from(), to: range.to()}
+    }
+  }); },
+  deleteLine: function (cm) { return deleteNearSelection(cm, function (range) { return ({
+    from: Pos(range.from().line, 0),
+    to: clipPos(cm.doc, Pos(range.to().line + 1, 0))
+  }); }); },
+  delLineLeft: function (cm) { return deleteNearSelection(cm, function (range) { return ({
+    from: Pos(range.from().line, 0), to: range.from()
+  }); }); },
+  delWrappedLineLeft: function (cm) { return deleteNearSelection(cm, function (range) {
+    var top = cm.charCoords(range.head, "div").top + 5
+    var leftPos = cm.coordsChar({left: 0, top: top}, "div")
+    return {from: leftPos, to: range.from()}
+  }); },
+  delWrappedLineRight: function (cm) { return deleteNearSelection(cm, function (range) {
+    var top = cm.charCoords(range.head, "div").top + 5
+    var rightPos = cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div")
+    return {from: range.from(), to: rightPos }
+  }); },
+  undo: function (cm) { return cm.undo(); },
+  redo: function (cm) { return cm.redo(); },
+  undoSelection: function (cm) { return cm.undoSelection(); },
+  redoSelection: function (cm) { return cm.redoSelection(); },
+  goDocStart: function (cm) { return cm.extendSelection(Pos(cm.firstLine(), 0)); },
+  goDocEnd: function (cm) { return cm.extendSelection(Pos(cm.lastLine())); },
+  goLineStart: function (cm) { return cm.extendSelectionsBy(function (range) { return lineStart(cm, range.head.line); },
+    {origin: "+move", bias: 1}
+  ); },
+  goLineStartSmart: function (cm) { return cm.extendSelectionsBy(function (range) { return lineStartSmart(cm, range.head); },
+    {origin: "+move", bias: 1}
+  ); },
+  goLineEnd: function (cm) { return cm.extendSelectionsBy(function (range) { return lineEnd(cm, range.head.line); },
+    {origin: "+move", bias: -1}
+  ); },
+  goLineRight: function (cm) { return cm.extendSelectionsBy(function (range) {
+    var top = cm.charCoords(range.head, "div").top + 5
+    return cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div")
+  }, sel_move); },
+  goLineLeft: function (cm) { return cm.extendSelectionsBy(function (range) {
+    var top = cm.charCoords(range.head, "div").top + 5
+    return cm.coordsChar({left: 0, top: top}, "div")
+  }, sel_move); },
+  goLineLeftSmart: function (cm) { return cm.extendSelectionsBy(function (range) {
+    var top = cm.charCoords(range.head, "div").top + 5
+    var pos = cm.coordsChar({left: 0, top: top}, "div")
+    if (pos.ch < cm.getLine(pos.line).search(/\S/)) { return lineStartSmart(cm, range.head) }
+    return pos
+  }, sel_move); },
+  goLineUp: function (cm) { return cm.moveV(-1, "line"); },
+  goLineDown: function (cm) { return cm.moveV(1, "line"); },
+  goPageUp: function (cm) { return cm.moveV(-1, "page"); },
+  goPageDown: function (cm) { return cm.moveV(1, "page"); },
+  goCharLeft: function (cm) { return cm.moveH(-1, "char"); },
+  goCharRight: function (cm) { return cm.moveH(1, "char"); },
+  goColumnLeft: function (cm) { return cm.moveH(-1, "column"); },
+  goColumnRight: function (cm) { return cm.moveH(1, "column"); },
+  goWordLeft: function (cm) { return cm.moveH(-1, "word"); },
+  goGroupRight: function (cm) { return cm.moveH(1, "group"); },
+  goGroupLeft: function (cm) { return cm.moveH(-1, "group"); },
+  goWordRight: function (cm) { return cm.moveH(1, "word"); },
+  delCharBefore: function (cm) { return cm.deleteH(-1, "char"); },
+  delCharAfter: function (cm) { return cm.deleteH(1, "char"); },
+  delWordBefore: function (cm) { return cm.deleteH(-1, "word"); },
+  delWordAfter: function (cm) { return cm.deleteH(1, "word"); },
+  delGroupBefore: function (cm) { return cm.deleteH(-1, "group"); },
+  delGroupAfter: function (cm) { return cm.deleteH(1, "group"); },
+  indentAuto: function (cm) { return cm.indentSelection("smart"); },
+  indentMore: function (cm) { return cm.indentSelection("add"); },
+  indentLess: function (cm) { return cm.indentSelection("subtract"); },
+  insertTab: function (cm) { return cm.replaceSelection("\t"); },
+  insertSoftTab: function (cm) {
+    var spaces = [], ranges = cm.listSelections(), tabSize = cm.options.tabSize
+    for (var i = 0; i < ranges.length; i++) {
+      var pos = ranges[i].from()
+      var col = countColumn(cm.getLine(pos.line), pos.ch, tabSize)
+      spaces.push(spaceStr(tabSize - col % tabSize))
+    }
+    cm.replaceSelections(spaces)
+  },
+  defaultTab: function (cm) {
+    if (cm.somethingSelected()) { cm.indentSelection("add") }
+    else { cm.execCommand("insertTab") }
+  },
+  // Swap the two chars left and right of each selection's head.
+  // Move cursor behind the two swapped characters afterwards.
+  //
+  // Doesn't consider line feeds a character.
+  // Doesn't scan more than one line above to find a character.
+  // Doesn't do anything on an empty line.
+  // Doesn't do anything with non-empty selections.
+  transposeChars: function (cm) { return runInOp(cm, function () {
+    var ranges = cm.listSelections(), newSel = []
+    for (var i = 0; i < ranges.length; i++) {
+      if (!ranges[i].empty()) { continue }
+      var cur = ranges[i].head, line = getLine(cm.doc, cur.line).text
+      if (line) {
+        if (cur.ch == line.length) { cur = new Pos(cur.line, cur.ch - 1) }
+        if (cur.ch > 0) {
+          cur = new Pos(cur.line, cur.ch + 1)
+          cm.replaceRange(line.charAt(cur.ch - 1) + line.charAt(cur.ch - 2),
+                          Pos(cur.line, cur.ch - 2), cur, "+transpose")
+        } else if (cur.line > cm.doc.first) {
+          var prev = getLine(cm.doc, cur.line - 1).text
+          if (prev) {
+            cur = new Pos(cur.line, 1)
+            cm.replaceRange(line.charAt(0) + cm.doc.lineSeparator() +
+                            prev.charAt(prev.length - 1),
+                            Pos(cur.line - 1, prev.length - 1), cur, "+transpose")
           }
         }
       }
-      return curPos;
+      newSel.push(new Range(cur, cur))
     }
+    cm.setSelections(newSel)
+  }); },
+  newlineAndIndent: function (cm) { return runInOp(cm, function () {
+    var sels = cm.listSelections()
+    for (var i = sels.length - 1; i >= 0; i--)
+      { cm.replaceRange(cm.doc.lineSeparator(), sels[i].anchor, sels[i].head, "+input") }
+    sels = cm.listSelections()
+    for (var i$1 = 0; i$1 < sels.length; i$1++)
+      { cm.indentLine(sels[i$1].from().line, null, true) }
+    ensureCursorVisible(cm)
+  }); },
+  openLine: function (cm) { return cm.replaceSelection("\n", "start"); },
+  toggleOverwrite: function (cm) { return cm.toggleOverwrite(); }
+}
+
+
+function lineStart(cm, lineN) {
+  var line = getLine(cm.doc, lineN)
+  var visual = visualLine(line)
+  if (visual != line) { lineN = lineNo(visual) }
+  return endOfLine(true, cm, visual, lineN, 1)
+}
+function lineEnd(cm, lineN) {
+  var line = getLine(cm.doc, lineN)
+  var visual = visualLineEnd(line)
+  if (visual != line) { lineN = lineNo(visual) }
+  return endOfLine(true, cm, line, lineN, -1)
+}
+function lineStartSmart(cm, pos) {
+  var start = lineStart(cm, pos.line)
+  var line = getLine(cm.doc, start.line)
+  var order = getOrder(line, cm.doc.direction)
+  if (!order || order[0].level == 0) {
+    var firstNonWS = Math.max(0, line.text.search(/\S/))
+    var inWS = pos.line == start.line && pos.ch <= firstNonWS && pos.ch
+    return Pos(start.line, inWS ? 0 : firstNonWS, start.sticky)
   }
+  return start
+}
 
-  // SCROLLING
+// Run a handler that was bound to a key.
+function doHandleBinding(cm, bound, dropShift) {
+  if (typeof bound == "string") {
+    bound = commands[bound]
+    if (!bound) { return false }
+  }
+  // Ensure previous input has been read, so that the handler sees a
+  // consistent view of the document
+  cm.display.input.ensurePolled()
+  var prevShift = cm.display.shift, done = false
+  try {
+    if (cm.isReadOnly()) { cm.state.suppressEdits = true }
+    if (dropShift) { cm.display.shift = false }
+    done = bound(cm) != Pass
+  } finally {
+    cm.display.shift = prevShift
+    cm.state.suppressEdits = false
+  }
+  return done
+}
 
-  function scrollCursorIntoView(cm) {
-    var coords = scrollPosIntoView(cm, cm.doc.sel.head, cm.options.cursorScrollMargin);
-    if (!cm.state.focused) return;
-    var display = cm.display, box = getRect(display.sizer), doScroll = null;
-    if (coords.top + box.top < 0) doScroll = true;
-    else if (coords.bottom + box.top > (window.innerHeight || document.documentElement.clientHeight)) doScroll = false;
-    if (doScroll != null && !phantom) {
-      var hidden = display.cursor.style.display == "none";
-      if (hidden) {
-        display.cursor.style.display = "";
-        display.cursor.style.left = coords.left + "px";
-        display.cursor.style.top = (coords.top - display.viewOffset) + "px";
+function lookupKeyForEditor(cm, name, handle) {
+  for (var i = 0; i < cm.state.keyMaps.length; i++) {
+    var result = lookupKey(name, cm.state.keyMaps[i], handle, cm)
+    if (result) { return result }
+  }
+  return (cm.options.extraKeys && lookupKey(name, cm.options.extraKeys, handle, cm))
+    || lookupKey(name, cm.options.keyMap, handle, cm)
+}
+
+var stopSeq = new Delayed
+function dispatchKey(cm, name, e, handle) {
+  var seq = cm.state.keySeq
+  if (seq) {
+    if (isModifierKey(name)) { return "handled" }
+    stopSeq.set(50, function () {
+      if (cm.state.keySeq == seq) {
+        cm.state.keySeq = null
+        cm.display.input.reset()
       }
-      display.cursor.scrollIntoView(doScroll);
-      if (hidden) display.cursor.style.display = "none";
-    }
+    })
+    name = seq + " " + name
+  }
+  var result = lookupKeyForEditor(cm, name, handle)
+
+  if (result == "multi")
+    { cm.state.keySeq = name }
+  if (result == "handled")
+    { signalLater(cm, "keyHandled", cm, name, e) }
+
+  if (result == "handled" || result == "multi") {
+    e_preventDefault(e)
+    restartBlink(cm)
   }
 
-  function scrollPosIntoView(cm, pos, margin) {
-    if (margin == null) margin = 0;
-    for (;;) {
-      var changed = false, coords = cursorCoords(cm, pos);
-      var scrollPos = calculateScrollPos(cm, coords.left, coords.top - margin, coords.left, coords.bottom + margin);
-      var startTop = cm.doc.scrollTop, startLeft = cm.doc.scrollLeft;
-      if (scrollPos.scrollTop != null) {
-        setScrollTop(cm, scrollPos.scrollTop);
-        if (Math.abs(cm.doc.scrollTop - startTop) > 1) changed = true;
+  if (seq && !result && /\'$/.test(name)) {
+    e_preventDefault(e)
+    return true
+  }
+  return !!result
+}
+
+// Handle a key from the keydown event.
+function handleKeyBinding(cm, e) {
+  var name = keyName(e, true)
+  if (!name) { return false }
+
+  if (e.shiftKey && !cm.state.keySeq) {
+    // First try to resolve full name (including 'Shift-'). Failing
+    // that, see if there is a cursor-motion command (starting with
+    // 'go') bound to the keyname without 'Shift-'.
+    return dispatchKey(cm, "Shift-" + name, e, function (b) { return doHandleBinding(cm, b, true); })
+        || dispatchKey(cm, name, e, function (b) {
+             if (typeof b == "string" ? /^go[A-Z]/.test(b) : b.motion)
+               { return doHandleBinding(cm, b) }
+           })
+  } else {
+    return dispatchKey(cm, name, e, function (b) { return doHandleBinding(cm, b); })
+  }
+}
+
+// Handle a key from the keypress event
+function handleCharBinding(cm, e, ch) {
+  return dispatchKey(cm, "'" + ch + "'", e, function (b) { return doHandleBinding(cm, b, true); })
+}
+
+var lastStoppedKey = null
+function onKeyDown(e) {
+  var cm = this
+  cm.curOp.focus = activeElt()
+  if (signalDOMEvent(cm, e)) { return }
+  // IE does strange things with escape.
+  if (ie && ie_version < 11 && e.keyCode == 27) { e.returnValue = false }
+  var code = e.keyCode
+  cm.display.shift = code == 16 || e.shiftKey
+  var handled = handleKeyBinding(cm, e)
+  if (presto) {
+    lastStoppedKey = handled ? code : null
+    // Opera has no cut event... we try to at least catch the key combo
+    if (!handled && code == 88 && !hasCopyEvent && (mac ? e.metaKey : e.ctrlKey))
+      { cm.replaceSelection("", null, "cut") }
+  }
+
+  // Turn mouse into crosshair when Alt is held on Mac.
+  if (code == 18 && !/\bCodeMirror-crosshair\b/.test(cm.display.lineDiv.className))
+    { showCrossHair(cm) }
+}
+
+function showCrossHair(cm) {
+  var lineDiv = cm.display.lineDiv
+  addClass(lineDiv, "CodeMirror-crosshair")
+
+  function up(e) {
+    if (e.keyCode == 18 || !e.altKey) {
+      rmClass(lineDiv, "CodeMirror-crosshair")
+      off(document, "keyup", up)
+      off(document, "mouseover", up)
+    }
+  }
+  on(document, "keyup", up)
+  on(document, "mouseover", up)
+}
+
+function onKeyUp(e) {
+  if (e.keyCode == 16) { this.doc.sel.shift = false }
+  signalDOMEvent(this, e)
+}
+
+function onKeyPress(e) {
+  var cm = this
+  if (eventInWidget(cm.display, e) || signalDOMEvent(cm, e) || e.ctrlKey && !e.altKey || mac && e.metaKey) { return }
+  var keyCode = e.keyCode, charCode = e.charCode
+  if (presto && keyCode == lastStoppedKey) {lastStoppedKey = null; e_preventDefault(e); return}
+  if ((presto && (!e.which || e.which < 10)) && handleKeyBinding(cm, e)) { return }
+  var ch = String.fromCharCode(charCode == null ? keyCode : charCode)
+  // Some browsers fire keypress events for backspace
+  if (ch == "\x08") { return }
+  if (handleCharBinding(cm, e, ch)) { return }
+  cm.display.input.onKeyPress(e)
+}
+
+// A mouse down can be a single click, double click, triple click,
+// start of selection drag, start of text drag, new cursor
+// (ctrl-click), rectangle drag (alt-drag), or xwin
+// middle-click-paste. Or it might be a click on something we should
+// not interfere with, such as a scrollbar or widget.
+function onMouseDown(e) {
+  var cm = this, display = cm.display
+  if (signalDOMEvent(cm, e) || display.activeTouch && display.input.supportsTouch()) { return }
+  display.input.ensurePolled()
+  display.shift = e.shiftKey
+
+  if (eventInWidget(display, e)) {
+    if (!webkit) {
+      // Briefly turn off draggability, to allow widgets to do
+      // normal dragging things.
+      display.scroller.draggable = false
+      setTimeout(function () { return display.scroller.draggable = true; }, 100)
+    }
+    return
+  }
+  if (clickInGutter(cm, e)) { return }
+  var start = posFromMouse(cm, e)
+  window.focus()
+
+  switch (e_button(e)) {
+  case 1:
+    // #3261: make sure, that we're not starting a second selection
+    if (cm.state.selectingText)
+      { cm.state.selectingText(e) }
+    else if (start)
+      { leftButtonDown(cm, e, start) }
+    else if (e_target(e) == display.scroller)
+      { e_preventDefault(e) }
+    break
+  case 2:
+    if (webkit) { cm.state.lastMiddleDown = +new Date }
+    if (start) { extendSelection(cm.doc, start) }
+    setTimeout(function () { return display.input.focus(); }, 20)
+    e_preventDefault(e)
+    break
+  case 3:
+    if (captureRightClick) { onContextMenu(cm, e) }
+    else { delayBlurEvent(cm) }
+    break
+  }
+}
+
+var lastClick;
+var lastDoubleClick;
+function leftButtonDown(cm, e, start) {
+  if (ie) { setTimeout(bind(ensureFocus, cm), 0) }
+  else { cm.curOp.focus = activeElt() }
+
+  var now = +new Date, type
+  if (lastDoubleClick && lastDoubleClick.time > now - 400 && cmp(lastDoubleClick.pos, start) == 0) {
+    type = "triple"
+  } else if (lastClick && lastClick.time > now - 400 && cmp(lastClick.pos, start) == 0) {
+    type = "double"
+    lastDoubleClick = {time: now, pos: start}
+  } else {
+    type = "single"
+    lastClick = {time: now, pos: start}
+  }
+
+  var sel = cm.doc.sel, modifier = mac ? e.metaKey : e.ctrlKey, contained
+  if (cm.options.dragDrop && dragAndDrop && !cm.isReadOnly() &&
+      type == "single" && (contained = sel.contains(start)) > -1 &&
+      (cmp((contained = sel.ranges[contained]).from(), start) < 0 || start.xRel > 0) &&
+      (cmp(contained.to(), start) > 0 || start.xRel < 0))
+    { leftButtonStartDrag(cm, e, start, modifier) }
+  else
+    { leftButtonSelect(cm, e, start, type, modifier) }
+}
+
+// Start a text drag. When it ends, see if any dragging actually
+// happen, and treat as a click if it didn't.
+function leftButtonStartDrag(cm, e, start, modifier) {
+  var display = cm.display, moved = false
+  var dragEnd = operation(cm, function (e) {
+    if (webkit) { display.scroller.draggable = false }
+    cm.state.draggingText = false
+    off(document, "mouseup", dragEnd)
+    off(document, "mousemove", mouseMove)
+    off(display.scroller, "dragstart", dragStart)
+    off(display.scroller, "drop", dragEnd)
+    if (!moved) {
+      e_preventDefault(e)
+      if (!modifier)
+        { extendSelection(cm.doc, start) }
+      // Work around unexplainable focus problem in IE9 (#2127) and Chrome (#3081)
+      if (webkit || ie && ie_version == 9)
+        { setTimeout(function () {document.body.focus(); display.input.focus()}, 20) }
+      else
+        { display.input.focus() }
+    }
+  })
+  var mouseMove = function(e2) {
+    moved = moved || Math.abs(e.clientX - e2.clientX) + Math.abs(e.clientY - e2.clientY) >= 10
+  }
+  var dragStart = function () { return moved = true; }
+  // Let the drag handler handle this.
+  if (webkit) { display.scroller.draggable = true }
+  cm.state.draggingText = dragEnd
+  dragEnd.copy = mac ? e.altKey : e.ctrlKey
+  // IE's approach to draggable
+  if (display.scroller.dragDrop) { display.scroller.dragDrop() }
+  on(document, "mouseup", dragEnd)
+  on(document, "mousemove", mouseMove)
+  on(display.scroller, "dragstart", dragStart)
+  on(display.scroller, "drop", dragEnd)
+
+  delayBlurEvent(cm)
+  setTimeout(function () { return display.input.focus(); }, 20)
+}
+
+// Normal selection, as opposed to text dragging.
+function leftButtonSelect(cm, e, start, type, addNew) {
+  var display = cm.display, doc = cm.doc
+  e_preventDefault(e)
+
+  var ourRange, ourIndex, startSel = doc.sel, ranges = startSel.ranges
+  if (addNew && !e.shiftKey) {
+    ourIndex = doc.sel.contains(start)
+    if (ourIndex > -1)
+      { ourRange = ranges[ourIndex] }
+    else
+      { ourRange = new Range(start, start) }
+  } else {
+    ourRange = doc.sel.primary()
+    ourIndex = doc.sel.primIndex
+  }
+
+  if (chromeOS ? e.shiftKey && e.metaKey : e.altKey) {
+    type = "rect"
+    if (!addNew) { ourRange = new Range(start, start) }
+    start = posFromMouse(cm, e, true, true)
+    ourIndex = -1
+  } else if (type == "double") {
+    var word = cm.findWordAt(start)
+    if (cm.display.shift || doc.extend)
+      { ourRange = extendRange(doc, ourRange, word.anchor, word.head) }
+    else
+      { ourRange = word }
+  } else if (type == "triple") {
+    var line = new Range(Pos(start.line, 0), clipPos(doc, Pos(start.line + 1, 0)))
+    if (cm.display.shift || doc.extend)
+      { ourRange = extendRange(doc, ourRange, line.anchor, line.head) }
+    else
+      { ourRange = line }
+  } else {
+    ourRange = extendRange(doc, ourRange, start)
+  }
+
+  if (!addNew) {
+    ourIndex = 0
+    setSelection(doc, new Selection([ourRange], 0), sel_mouse)
+    startSel = doc.sel
+  } else if (ourIndex == -1) {
+    ourIndex = ranges.length
+    setSelection(doc, normalizeSelection(ranges.concat([ourRange]), ourIndex),
+                 {scroll: false, origin: "*mouse"})
+  } else if (ranges.length > 1 && ranges[ourIndex].empty() && type == "single" && !e.shiftKey) {
+    setSelection(doc, normalizeSelection(ranges.slice(0, ourIndex).concat(ranges.slice(ourIndex + 1)), 0),
+                 {scroll: false, origin: "*mouse"})
+    startSel = doc.sel
+  } else {
+    replaceOneSelection(doc, ourIndex, ourRange, sel_mouse)
+  }
+
+  var lastPos = start
+  function extendTo(pos) {
+    if (cmp(lastPos, pos) == 0) { return }
+    lastPos = pos
+
+    if (type == "rect") {
+      var ranges = [], tabSize = cm.options.tabSize
+      var startCol = countColumn(getLine(doc, start.line).text, start.ch, tabSize)
+      var posCol = countColumn(getLine(doc, pos.line).text, pos.ch, tabSize)
+      var left = Math.min(startCol, posCol), right = Math.max(startCol, posCol)
+      for (var line = Math.min(start.line, pos.line), end = Math.min(cm.lastLine(), Math.max(start.line, pos.line));
+           line <= end; line++) {
+        var text = getLine(doc, line).text, leftPos = findColumn(text, left, tabSize)
+        if (left == right)
+          { ranges.push(new Range(Pos(line, leftPos), Pos(line, leftPos))) }
+        else if (text.length > leftPos)
+          { ranges.push(new Range(Pos(line, leftPos), Pos(line, findColumn(text, right, tabSize)))) }
       }
-      if (scrollPos.scrollLeft != null) {
-        setScrollLeft(cm, scrollPos.scrollLeft);
-        if (Math.abs(cm.doc.scrollLeft - startLeft) > 1) changed = true;
-      }
-      if (!changed) return coords;
-    }
-  }
-
-  function scrollIntoView(cm, x1, y1, x2, y2) {
-    var scrollPos = calculateScrollPos(cm, x1, y1, x2, y2);
-    if (scrollPos.scrollTop != null) setScrollTop(cm, scrollPos.scrollTop);
-    if (scrollPos.scrollLeft != null) setScrollLeft(cm, scrollPos.scrollLeft);
-  }
-
-  function calculateScrollPos(cm, x1, y1, x2, y2) {
-    var display = cm.display, snapMargin = textHeight(cm.display);
-    if (y1 < 0) y1 = 0;
-    var screen = display.scroller.clientHeight - scrollerCutOff, screentop = display.scroller.scrollTop, result = {};
-    var docBottom = cm.doc.height + paddingVert(display);
-    var atTop = y1 < snapMargin, atBottom = y2 > docBottom - snapMargin;
-    if (y1 < screentop) {
-      result.scrollTop = atTop ? 0 : y1;
-    } else if (y2 > screentop + screen) {
-      var newTop = Math.min(y1, (atBottom ? docBottom : y2) - screen);
-      if (newTop != screentop) result.scrollTop = newTop;
-    }
-
-    var screenw = display.scroller.clientWidth - scrollerCutOff, screenleft = display.scroller.scrollLeft;
-    x1 += display.gutters.offsetWidth; x2 += display.gutters.offsetWidth;
-    var gutterw = display.gutters.offsetWidth;
-    var atLeft = x1 < gutterw + 10;
-    if (x1 < screenleft + gutterw || atLeft) {
-      if (atLeft) x1 = 0;
-      result.scrollLeft = Math.max(0, x1 - 10 - gutterw);
-    } else if (x2 > screenw + screenleft - 3) {
-      result.scrollLeft = x2 + 10 - screenw;
-    }
-    return result;
-  }
-
-  function updateScrollPos(cm, left, top) {
-    cm.curOp.updateScrollPos = {scrollLeft: left == null ? cm.doc.scrollLeft : left,
-                                scrollTop: top == null ? cm.doc.scrollTop : top};
-  }
-
-  function addToScrollPos(cm, left, top) {
-    var pos = cm.curOp.updateScrollPos || (cm.curOp.updateScrollPos = {scrollLeft: cm.doc.scrollLeft, scrollTop: cm.doc.scrollTop});
-    var scroll = cm.display.scroller;
-    pos.scrollTop = Math.max(0, Math.min(scroll.scrollHeight - scroll.clientHeight, pos.scrollTop + top));
-    pos.scrollLeft = Math.max(0, Math.min(scroll.scrollWidth - scroll.clientWidth, pos.scrollLeft + left));
-  }
-
-  // API UTILITIES
-
-  function indentLine(cm, n, how, aggressive) {
-    var doc = cm.doc;
-    if (how == null) how = "add";
-    if (how == "smart") {
-      if (!cm.doc.mode.indent) how = "prev";
-      else var state = getStateBefore(cm, n);
-    }
-
-    var tabSize = cm.options.tabSize;
-    var line = getLine(doc, n), curSpace = countColumn(line.text, null, tabSize);
-    var curSpaceString = line.text.match(/^\s*/)[0], indentation;
-    if (how == "smart") {
-      indentation = cm.doc.mode.indent(state, line.text.slice(curSpaceString.length), line.text);
-      if (indentation == Pass) {
-        if (!aggressive) return;
-        how = "prev";
-      }
-    }
-    if (how == "prev") {
-      if (n > doc.first) indentation = countColumn(getLine(doc, n-1).text, null, tabSize);
-      else indentation = 0;
-    } else if (how == "add") {
-      indentation = curSpace + cm.options.indentUnit;
-    } else if (how == "subtract") {
-      indentation = curSpace - cm.options.indentUnit;
-    } else if (typeof how == "number") {
-      indentation = curSpace + how;
-    }
-    indentation = Math.max(0, indentation);
-
-    var indentString = "", pos = 0;
-    if (cm.options.indentWithTabs)
-      for (var i = Math.floor(indentation / tabSize); i; --i) {pos += tabSize; indentString += "\t";}
-    if (pos < indentation) indentString += spaceStr(indentation - pos);
-
-    if (indentString != curSpaceString)
-      replaceRange(cm.doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), "+input");
-    line.stateAfter = null;
-  }
-
-  function changeLine(cm, handle, op) {
-    var no = handle, line = handle, doc = cm.doc;
-    if (typeof handle == "number") line = getLine(doc, clipLine(doc, handle));
-    else no = lineNo(handle);
-    if (no == null) return null;
-    if (op(line, no)) regChange(cm, no, no + 1);
-    else return null;
-    return line;
-  }
-
-  function findPosH(doc, pos, dir, unit, visually) {
-    var line = pos.line, ch = pos.ch, origDir = dir;
-    var lineObj = getLine(doc, line);
-    var possible = true;
-    function findNextLine() {
-      var l = line + dir;
-      if (l < doc.first || l >= doc.first + doc.size) return (possible = false);
-      line = l;
-      return lineObj = getLine(doc, l);
-    }
-    function moveOnce(boundToLine) {
-      var next = (visually ? moveVisually : moveLogically)(lineObj, ch, dir, true);
-      if (next == null) {
-        if (!boundToLine && findNextLine()) {
-          if (visually) ch = (dir < 0 ? lineRight : lineLeft)(lineObj);
-          else ch = dir < 0 ? lineObj.text.length : 0;
-        } else return (possible = false);
-      } else ch = next;
-      return true;
-    }
-
-    if (unit == "char") moveOnce();
-    else if (unit == "column") moveOnce(true);
-    else if (unit == "word" || unit == "group") {
-      var sawType = null, group = unit == "group";
-      for (var first = true;; first = false) {
-        if (dir < 0 && !moveOnce(!first)) break;
-        var cur = lineObj.text.charAt(ch) || "\n";
-        var type = isWordChar(cur) ? "w"
-          : !group ? null
-          : /\s/.test(cur) ? null
-          : "p";
-        if (sawType && sawType != type) {
-          if (dir < 0) {dir = 1; moveOnce();}
-          break;
+      if (!ranges.length) { ranges.push(new Range(start, start)) }
+      setSelection(doc, normalizeSelection(startSel.ranges.slice(0, ourIndex).concat(ranges), ourIndex),
+                   {origin: "*mouse", scroll: false})
+      cm.scrollIntoView(pos)
+    } else {
+      var oldRange = ourRange
+      var anchor = oldRange.anchor, head = pos
+      if (type != "single") {
+        var range
+        if (type == "double")
+          { range = cm.findWordAt(pos) }
+        else
+          { range = new Range(Pos(pos.line, 0), clipPos(doc, Pos(pos.line + 1, 0))) }
+        if (cmp(range.anchor, anchor) > 0) {
+          head = range.head
+          anchor = minPos(oldRange.from(), range.anchor)
+        } else {
+          head = range.anchor
+          anchor = maxPos(oldRange.to(), range.head)
         }
-        if (type) sawType = type;
-        if (dir > 0 && !moveOnce(!first)) break;
+      }
+      var ranges$1 = startSel.ranges.slice(0)
+      ranges$1[ourIndex] = new Range(clipPos(doc, anchor), head)
+      setSelection(doc, normalizeSelection(ranges$1, ourIndex), sel_mouse)
+    }
+  }
+
+  var editorSize = display.wrapper.getBoundingClientRect()
+  // Used to ensure timeout re-tries don't fire when another extend
+  // happened in the meantime (clearTimeout isn't reliable -- at
+  // least on Chrome, the timeouts still happen even when cleared,
+  // if the clear happens after their scheduled firing time).
+  var counter = 0
+
+  function extend(e) {
+    var curCount = ++counter
+    var cur = posFromMouse(cm, e, true, type == "rect")
+    if (!cur) { return }
+    if (cmp(cur, lastPos) != 0) {
+      cm.curOp.focus = activeElt()
+      extendTo(cur)
+      var visible = visibleLines(display, doc)
+      if (cur.line >= visible.to || cur.line < visible.from)
+        { setTimeout(operation(cm, function () {if (counter == curCount) { extend(e) }}), 150) }
+    } else {
+      var outside = e.clientY < editorSize.top ? -20 : e.clientY > editorSize.bottom ? 20 : 0
+      if (outside) { setTimeout(operation(cm, function () {
+        if (counter != curCount) { return }
+        display.scroller.scrollTop += outside
+        extend(e)
+      }), 50) }
+    }
+  }
+
+  function done(e) {
+    cm.state.selectingText = false
+    counter = Infinity
+    e_preventDefault(e)
+    display.input.focus()
+    off(document, "mousemove", move)
+    off(document, "mouseup", up)
+    doc.history.lastSelOrigin = null
+  }
+
+  var move = operation(cm, function (e) {
+    if (!e_button(e)) { done(e) }
+    else { extend(e) }
+  })
+  var up = operation(cm, done)
+  cm.state.selectingText = up
+  on(document, "mousemove", move)
+  on(document, "mouseup", up)
+}
+
+
+// Determines whether an event happened in the gutter, and fires the
+// handlers for the corresponding event.
+function gutterEvent(cm, e, type, prevent) {
+  var mX, mY
+  try { mX = e.clientX; mY = e.clientY }
+  catch(e) { return false }
+  if (mX >= Math.floor(cm.display.gutters.getBoundingClientRect().right)) { return false }
+  if (prevent) { e_preventDefault(e) }
+
+  var display = cm.display
+  var lineBox = display.lineDiv.getBoundingClientRect()
+
+  if (mY > lineBox.bottom || !hasHandler(cm, type)) { return e_defaultPrevented(e) }
+  mY -= lineBox.top - display.viewOffset
+
+  for (var i = 0; i < cm.options.gutters.length; ++i) {
+    var g = display.gutters.childNodes[i]
+    if (g && g.getBoundingClientRect().right >= mX) {
+      var line = lineAtHeight(cm.doc, mY)
+      var gutter = cm.options.gutters[i]
+      signal(cm, type, cm, line, gutter, e)
+      return e_defaultPrevented(e)
+    }
+  }
+}
+
+function clickInGutter(cm, e) {
+  return gutterEvent(cm, e, "gutterClick", true)
+}
+
+// CONTEXT MENU HANDLING
+
+// To make the context menu work, we need to briefly unhide the
+// textarea (making it as unobtrusive as possible) to let the
+// right-click take effect on it.
+function onContextMenu(cm, e) {
+  if (eventInWidget(cm.display, e) || contextMenuInGutter(cm, e)) { return }
+  if (signalDOMEvent(cm, e, "contextmenu")) { return }
+  cm.display.input.onContextMenu(e)
+}
+
+function contextMenuInGutter(cm, e) {
+  if (!hasHandler(cm, "gutterContextMenu")) { return false }
+  return gutterEvent(cm, e, "gutterContextMenu", false)
+}
+
+function themeChanged(cm) {
+  cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-s-\S+/g, "") +
+    cm.options.theme.replace(/(^|\s)\s*/g, " cm-s-")
+  clearCaches(cm)
+}
+
+var Init = {toString: function(){return "CodeMirror.Init"}}
+
+var defaults = {}
+var optionHandlers = {}
+
+function defineOptions(CodeMirror) {
+  var optionHandlers = CodeMirror.optionHandlers
+
+  function option(name, deflt, handle, notOnInit) {
+    CodeMirror.defaults[name] = deflt
+    if (handle) { optionHandlers[name] =
+      notOnInit ? function (cm, val, old) {if (old != Init) { handle(cm, val, old) }} : handle }
+  }
+
+  CodeMirror.defineOption = option
+
+  // Passed to option handlers when there is no old value.
+  CodeMirror.Init = Init
+
+  // These two are, on init, called from the constructor because they
+  // have to be initialized before the editor can start at all.
+  option("value", "", function (cm, val) { return cm.setValue(val); }, true)
+  option("mode", null, function (cm, val) {
+    cm.doc.modeOption = val
+    loadMode(cm)
+  }, true)
+
+  option("indentUnit", 2, loadMode, true)
+  option("indentWithTabs", false)
+  option("smartIndent", true)
+  option("tabSize", 4, function (cm) {
+    resetModeState(cm)
+    clearCaches(cm)
+    regChange(cm)
+  }, true)
+  option("lineSeparator", null, function (cm, val) {
+    cm.doc.lineSep = val
+    if (!val) { return }
+    var newBreaks = [], lineNo = cm.doc.first
+    cm.doc.iter(function (line) {
+      for (var pos = 0;;) {
+        var found = line.text.indexOf(val, pos)
+        if (found == -1) { break }
+        pos = found + val.length
+        newBreaks.push(Pos(lineNo, found))
+      }
+      lineNo++
+    })
+    for (var i = newBreaks.length - 1; i >= 0; i--)
+      { replaceRange(cm.doc, val, newBreaks[i], Pos(newBreaks[i].line, newBreaks[i].ch + val.length)) }
+  })
+  option("specialChars", /[\u0000-\u001f\u007f-\u009f\u00ad\u061c\u200b-\u200f\u2028\u2029\ufeff]/g, function (cm, val, old) {
+    cm.state.specialChars = new RegExp(val.source + (val.test("\t") ? "" : "|\t"), "g")
+    if (old != Init) { cm.refresh() }
+  })
+  option("specialCharPlaceholder", defaultSpecialCharPlaceholder, function (cm) { return cm.refresh(); }, true)
+  option("electricChars", true)
+  option("inputStyle", mobile ? "contenteditable" : "textarea", function () {
+    throw new Error("inputStyle can not (yet) be changed in a running editor") // FIXME
+  }, true)
+  option("spellcheck", false, function (cm, val) { return cm.getInputField().spellcheck = val; }, true)
+  option("rtlMoveVisually", !windows)
+  option("wholeLineUpdateBefore", true)
+
+  option("theme", "default", function (cm) {
+    themeChanged(cm)
+    guttersChanged(cm)
+  }, true)
+  option("keyMap", "default", function (cm, val, old) {
+    var next = getKeyMap(val)
+    var prev = old != Init && getKeyMap(old)
+    if (prev && prev.detach) { prev.detach(cm, next) }
+    if (next.attach) { next.attach(cm, prev || null) }
+  })
+  option("extraKeys", null)
+
+  option("lineWrapping", false, wrappingChanged, true)
+  option("gutters", [], function (cm) {
+    setGuttersForLineNumbers(cm.options)
+    guttersChanged(cm)
+  }, true)
+  option("fixedGutter", true, function (cm, val) {
+    cm.display.gutters.style.left = val ? compensateForHScroll(cm.display) + "px" : "0"
+    cm.refresh()
+  }, true)
+  option("coverGutterNextToScrollbar", false, function (cm) { return updateScrollbars(cm); }, true)
+  option("scrollbarStyle", "native", function (cm) {
+    initScrollbars(cm)
+    updateScrollbars(cm)
+    cm.display.scrollbars.setScrollTop(cm.doc.scrollTop)
+    cm.display.scrollbars.setScrollLeft(cm.doc.scrollLeft)
+  }, true)
+  option("lineNumbers", false, function (cm) {
+    setGuttersForLineNumbers(cm.options)
+    guttersChanged(cm)
+  }, true)
+  option("firstLineNumber", 1, guttersChanged, true)
+  option("lineNumberFormatter", function (integer) { return integer; }, guttersChanged, true)
+  option("showCursorWhenSelecting", false, updateSelection, true)
+
+  option("resetSelectionOnContextMenu", true)
+  option("lineWiseCopyCut", true)
+
+  option("readOnly", false, function (cm, val) {
+    if (val == "nocursor") {
+      onBlur(cm)
+      cm.display.input.blur()
+      cm.display.disabled = true
+    } else {
+      cm.display.disabled = false
+    }
+    cm.display.input.readOnlyChanged(val)
+  })
+  option("disableInput", false, function (cm, val) {if (!val) { cm.display.input.reset() }}, true)
+  option("dragDrop", true, dragDropChanged)
+  option("allowDropFileTypes", null)
+
+  option("cursorBlinkRate", 530)
+  option("cursorScrollMargin", 0)
+  option("cursorHeight", 1, updateSelection, true)
+  option("singleCursorHeightPerLine", true, updateSelection, true)
+  option("workTime", 100)
+  option("workDelay", 100)
+  option("flattenSpans", true, resetModeState, true)
+  option("addModeClass", false, resetModeState, true)
+  option("pollInterval", 100)
+  option("undoDepth", 200, function (cm, val) { return cm.doc.history.undoDepth = val; })
+  option("historyEventDelay", 1250)
+  option("viewportMargin", 10, function (cm) { return cm.refresh(); }, true)
+  option("maxHighlightLength", 10000, resetModeState, true)
+  option("moveInputWithCursor", true, function (cm, val) {
+    if (!val) { cm.display.input.resetPosition() }
+  })
+
+  option("tabindex", null, function (cm, val) { return cm.display.input.getField().tabIndex = val || ""; })
+  option("autofocus", null)
+  option("direction", "ltr", function (cm, val) { return cm.doc.setDirection(val); }, true)
+}
+
+function guttersChanged(cm) {
+  updateGutters(cm)
+  regChange(cm)
+  alignHorizontally(cm)
+}
+
+function dragDropChanged(cm, value, old) {
+  var wasOn = old && old != Init
+  if (!value != !wasOn) {
+    var funcs = cm.display.dragFunctions
+    var toggle = value ? on : off
+    toggle(cm.display.scroller, "dragstart", funcs.start)
+    toggle(cm.display.scroller, "dragenter", funcs.enter)
+    toggle(cm.display.scroller, "dragover", funcs.over)
+    toggle(cm.display.scroller, "dragleave", funcs.leave)
+    toggle(cm.display.scroller, "drop", funcs.drop)
+  }
+}
+
+function wrappingChanged(cm) {
+  if (cm.options.lineWrapping) {
+    addClass(cm.display.wrapper, "CodeMirror-wrap")
+    cm.display.sizer.style.minWidth = ""
+    cm.display.sizerWidth = null
+  } else {
+    rmClass(cm.display.wrapper, "CodeMirror-wrap")
+    findMaxLine(cm)
+  }
+  estimateLineHeights(cm)
+  regChange(cm)
+  clearCaches(cm)
+  setTimeout(function () { return updateScrollbars(cm); }, 100)
+}
+
+// A CodeMirror instance represents an editor. This is the object
+// that user code is usually dealing with.
+
+function CodeMirror(place, options) {
+  var this$1 = this;
+
+  if (!(this instanceof CodeMirror)) { return new CodeMirror(place, options) }
+
+  this.options = options = options ? copyObj(options) : {}
+  // Determine effective options based on given values and defaults.
+  copyObj(defaults, options, false)
+  setGuttersForLineNumbers(options)
+
+  var doc = options.value
+  if (typeof doc == "string") { doc = new Doc(doc, options.mode, null, options.lineSeparator, options.direction) }
+  this.doc = doc
+
+  var input = new CodeMirror.inputStyles[options.inputStyle](this)
+  var display = this.display = new Display(place, doc, input)
+  display.wrapper.CodeMirror = this
+  updateGutters(this)
+  themeChanged(this)
+  if (options.lineWrapping)
+    { this.display.wrapper.className += " CodeMirror-wrap" }
+  initScrollbars(this)
+
+  this.state = {
+    keyMaps: [],  // stores maps added by addKeyMap
+    overlays: [], // highlighting overlays, as added by addOverlay
+    modeGen: 0,   // bumped when mode/overlay changes, used to invalidate highlighting info
+    overwrite: false,
+    delayingBlurEvent: false,
+    focused: false,
+    suppressEdits: false, // used to disable editing during key handlers when in readOnly mode
+    pasteIncoming: false, cutIncoming: false, // help recognize paste/cut edits in input.poll
+    selectingText: false,
+    draggingText: false,
+    highlight: new Delayed(), // stores highlight worker timeout
+    keySeq: null,  // Unfinished key sequence
+    specialChars: null
+  }
+
+  if (options.autofocus && !mobile) { display.input.focus() }
+
+  // Override magic textarea content restore that IE sometimes does
+  // on our hidden textarea on reload
+  if (ie && ie_version < 11) { setTimeout(function () { return this$1.display.input.reset(true); }, 20) }
+
+  registerEventHandlers(this)
+  ensureGlobalHandlers()
+
+  startOperation(this)
+  this.curOp.forceUpdate = true
+  attachDoc(this, doc)
+
+  if ((options.autofocus && !mobile) || this.hasFocus())
+    { setTimeout(bind(onFocus, this), 20) }
+  else
+    { onBlur(this) }
+
+  for (var opt in optionHandlers) { if (optionHandlers.hasOwnProperty(opt))
+    { optionHandlers[opt](this$1, options[opt], Init) } }
+  maybeUpdateLineNumberWidth(this)
+  if (options.finishInit) { options.finishInit(this) }
+  for (var i = 0; i < initHooks.length; ++i) { initHooks[i](this$1) }
+  endOperation(this)
+  // Suppress optimizelegibility in Webkit, since it breaks text
+  // measuring on line wrapping boundaries.
+  if (webkit && options.lineWrapping &&
+      getComputedStyle(display.lineDiv).textRendering == "optimizelegibility")
+    { display.lineDiv.style.textRendering = "auto" }
+}
+
+// The default configuration options.
+CodeMirror.defaults = defaults
+// Functions to run when options are changed.
+CodeMirror.optionHandlers = optionHandlers
+
+// Attach the necessary event handlers when initializing the editor
+function registerEventHandlers(cm) {
+  var d = cm.display
+  on(d.scroller, "mousedown", operation(cm, onMouseDown))
+  // Older IE's will not fire a second mousedown for a double click
+  if (ie && ie_version < 11)
+    { on(d.scroller, "dblclick", operation(cm, function (e) {
+      if (signalDOMEvent(cm, e)) { return }
+      var pos = posFromMouse(cm, e)
+      if (!pos || clickInGutter(cm, e) || eventInWidget(cm.display, e)) { return }
+      e_preventDefault(e)
+      var word = cm.findWordAt(pos)
+      extendSelection(cm.doc, word.anchor, word.head)
+    })) }
+  else
+    { on(d.scroller, "dblclick", function (e) { return signalDOMEvent(cm, e) || e_preventDefault(e); }) }
+  // Some browsers fire contextmenu *after* opening the menu, at
+  // which point we can't mess with it anymore. Context menu is
+  // handled in onMouseDown for these browsers.
+  if (!captureRightClick) { on(d.scroller, "contextmenu", function (e) { return onContextMenu(cm, e); }) }
+
+  // Used to suppress mouse event handling when a touch happens
+  var touchFinished, prevTouch = {end: 0}
+  function finishTouch() {
+    if (d.activeTouch) {
+      touchFinished = setTimeout(function () { return d.activeTouch = null; }, 1000)
+      prevTouch = d.activeTouch
+      prevTouch.end = +new Date
+    }
+  }
+  function isMouseLikeTouchEvent(e) {
+    if (e.touches.length != 1) { return false }
+    var touch = e.touches[0]
+    return touch.radiusX <= 1 && touch.radiusY <= 1
+  }
+  function farAway(touch, other) {
+    if (other.left == null) { return true }
+    var dx = other.left - touch.left, dy = other.top - touch.top
+    return dx * dx + dy * dy > 20 * 20
+  }
+  on(d.scroller, "touchstart", function (e) {
+    if (!signalDOMEvent(cm, e) && !isMouseLikeTouchEvent(e)) {
+      d.input.ensurePolled()
+      clearTimeout(touchFinished)
+      var now = +new Date
+      d.activeTouch = {start: now, moved: false,
+                       prev: now - prevTouch.end <= 300 ? prevTouch : null}
+      if (e.touches.length == 1) {
+        d.activeTouch.left = e.touches[0].pageX
+        d.activeTouch.top = e.touches[0].pageY
       }
     }
-    var result = skipAtomic(doc, Pos(line, ch), origDir, true);
-    if (!possible) result.hitSide = true;
-    return result;
-  }
-
-  function findPosV(cm, pos, dir, unit) {
-    var doc = cm.doc, x = pos.left, y;
-    if (unit == "page") {
-      var pageSize = Math.min(cm.display.wrapper.clientHeight, window.innerHeight || document.documentElement.clientHeight);
-      y = pos.top + dir * (pageSize - (dir < 0 ? 1.5 : .5) * textHeight(cm.display));
-    } else if (unit == "line") {
-      y = dir > 0 ? pos.bottom + 3 : pos.top - 3;
+  })
+  on(d.scroller, "touchmove", function () {
+    if (d.activeTouch) { d.activeTouch.moved = true }
+  })
+  on(d.scroller, "touchend", function (e) {
+    var touch = d.activeTouch
+    if (touch && !eventInWidget(d, e) && touch.left != null &&
+        !touch.moved && new Date - touch.start < 300) {
+      var pos = cm.coordsChar(d.activeTouch, "page"), range
+      if (!touch.prev || farAway(touch, touch.prev)) // Single tap
+        { range = new Range(pos, pos) }
+      else if (!touch.prev.prev || farAway(touch, touch.prev.prev)) // Double tap
+        { range = cm.findWordAt(pos) }
+      else // Triple tap
+        { range = new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0))) }
+      cm.setSelection(range.anchor, range.head)
+      cm.focus()
+      e_preventDefault(e)
     }
-    for (;;) {
-      var target = coordsChar(cm, x, y);
-      if (!target.outside) break;
-      if (dir < 0 ? y <= 0 : y >= doc.height) { target.hitSide = true; break; }
-      y += dir * 5;
+    finishTouch()
+  })
+  on(d.scroller, "touchcancel", finishTouch)
+
+  // Sync scrolling between fake scrollbars and real scrollable
+  // area, ensure viewport is updated when scrolling.
+  on(d.scroller, "scroll", function () {
+    if (d.scroller.clientHeight) {
+      setScrollTop(cm, d.scroller.scrollTop)
+      setScrollLeft(cm, d.scroller.scrollLeft, true)
+      signal(cm, "scroll", cm)
     }
-    return target;
+  })
+
+  // Listen to wheel events in order to try and update the viewport on time.
+  on(d.scroller, "mousewheel", function (e) { return onScrollWheel(cm, e); })
+  on(d.scroller, "DOMMouseScroll", function (e) { return onScrollWheel(cm, e); })
+
+  // Prevent wrapper from ever scrolling
+  on(d.wrapper, "scroll", function () { return d.wrapper.scrollTop = d.wrapper.scrollLeft = 0; })
+
+  d.dragFunctions = {
+    enter: function (e) {if (!signalDOMEvent(cm, e)) { e_stop(e) }},
+    over: function (e) {if (!signalDOMEvent(cm, e)) { onDragOver(cm, e); e_stop(e) }},
+    start: function (e) { return onDragStart(cm, e); },
+    drop: operation(cm, onDrop),
+    leave: function (e) {if (!signalDOMEvent(cm, e)) { clearDragCursor(cm) }}
   }
 
-  function findWordAt(line, pos) {
-    var start = pos.ch, end = pos.ch;
-    if (line) {
-      if ((pos.xRel < 0 || end == line.length) && start) --start; else ++end;
-      var startChar = line.charAt(start);
-      var check = isWordChar(startChar) ? isWordChar
-        : /\s/.test(startChar) ? function(ch) {return /\s/.test(ch);}
-        : function(ch) {return !/\s/.test(ch) && !isWordChar(ch);};
-      while (start > 0 && check(line.charAt(start - 1))) --start;
-      while (end < line.length && check(line.charAt(end))) ++end;
+  var inp = d.input.getField()
+  on(inp, "keyup", function (e) { return onKeyUp.call(cm, e); })
+  on(inp, "keydown", operation(cm, onKeyDown))
+  on(inp, "keypress", operation(cm, onKeyPress))
+  on(inp, "focus", function (e) { return onFocus(cm, e); })
+  on(inp, "blur", function (e) { return onBlur(cm, e); })
+}
+
+var initHooks = []
+CodeMirror.defineInitHook = function (f) { return initHooks.push(f); }
+
+// Indent the given line. The how parameter can be "smart",
+// "add"/null, "subtract", or "prev". When aggressive is false
+// (typically set to true for forced single-line indents), empty
+// lines are not indented, and places where the mode returns Pass
+// are left alone.
+function indentLine(cm, n, how, aggressive) {
+  var doc = cm.doc, state
+  if (how == null) { how = "add" }
+  if (how == "smart") {
+    // Fall back to "prev" when the mode doesn't have an indentation
+    // method.
+    if (!doc.mode.indent) { how = "prev" }
+    else { state = getStateBefore(cm, n) }
+  }
+
+  var tabSize = cm.options.tabSize
+  var line = getLine(doc, n), curSpace = countColumn(line.text, null, tabSize)
+  if (line.stateAfter) { line.stateAfter = null }
+  var curSpaceString = line.text.match(/^\s*/)[0], indentation
+  if (!aggressive && !/\S/.test(line.text)) {
+    indentation = 0
+    how = "not"
+  } else if (how == "smart") {
+    indentation = doc.mode.indent(state, line.text.slice(curSpaceString.length), line.text)
+    if (indentation == Pass || indentation > 150) {
+      if (!aggressive) { return }
+      how = "prev"
     }
-    return {from: Pos(pos.line, start), to: Pos(pos.line, end)};
+  }
+  if (how == "prev") {
+    if (n > doc.first) { indentation = countColumn(getLine(doc, n-1).text, null, tabSize) }
+    else { indentation = 0 }
+  } else if (how == "add") {
+    indentation = curSpace + cm.options.indentUnit
+  } else if (how == "subtract") {
+    indentation = curSpace - cm.options.indentUnit
+  } else if (typeof how == "number") {
+    indentation = curSpace + how
+  }
+  indentation = Math.max(0, indentation)
+
+  var indentString = "", pos = 0
+  if (cm.options.indentWithTabs)
+    { for (var i = Math.floor(indentation / tabSize); i; --i) {pos += tabSize; indentString += "\t"} }
+  if (pos < indentation) { indentString += spaceStr(indentation - pos) }
+
+  if (indentString != curSpaceString) {
+    replaceRange(doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), "+input")
+    line.stateAfter = null
+    return true
+  } else {
+    // Ensure that, if the cursor was in the whitespace at the start
+    // of the line, it is moved to the end of that space.
+    for (var i$1 = 0; i$1 < doc.sel.ranges.length; i$1++) {
+      var range = doc.sel.ranges[i$1]
+      if (range.head.line == n && range.head.ch < curSpaceString.length) {
+        var pos$1 = Pos(n, curSpaceString.length)
+        replaceOneSelection(doc, i$1, new Range(pos$1, pos$1))
+        break
+      }
+    }
+  }
+}
+
+// This will be set to a {lineWise: bool, text: [string]} object, so
+// that, when pasting, we know what kind of selections the copied
+// text was made out of.
+var lastCopied = null
+
+function setLastCopied(newLastCopied) {
+  lastCopied = newLastCopied
+}
+
+function applyTextInput(cm, inserted, deleted, sel, origin) {
+  var doc = cm.doc
+  cm.display.shift = false
+  if (!sel) { sel = doc.sel }
+
+  var paste = cm.state.pasteIncoming || origin == "paste"
+  var textLines = splitLinesAuto(inserted), multiPaste = null
+  // When pasing N lines into N selections, insert one line per selection
+  if (paste && sel.ranges.length > 1) {
+    if (lastCopied && lastCopied.text.join("\n") == inserted) {
+      if (sel.ranges.length % lastCopied.text.length == 0) {
+        multiPaste = []
+        for (var i = 0; i < lastCopied.text.length; i++)
+          { multiPaste.push(doc.splitLines(lastCopied.text[i])) }
+      }
+    } else if (textLines.length == sel.ranges.length) {
+      multiPaste = map(textLines, function (l) { return [l]; })
+    }
   }
 
-  function selectLine(cm, line) {
-    extendSelection(cm.doc, Pos(line, 0), clipPos(cm.doc, Pos(line + 1, 0)));
+  var updateInput
+  // Normal behavior is to insert the new text into every selection
+  for (var i$1 = sel.ranges.length - 1; i$1 >= 0; i$1--) {
+    var range = sel.ranges[i$1]
+    var from = range.from(), to = range.to()
+    if (range.empty()) {
+      if (deleted && deleted > 0) // Handle deletion
+        { from = Pos(from.line, from.ch - deleted) }
+      else if (cm.state.overwrite && !paste) // Handle overwrite
+        { to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + lst(textLines).length)) }
+      else if (lastCopied && lastCopied.lineWise && lastCopied.text.join("\n") == inserted)
+        { from = to = Pos(from.line, 0) }
+    }
+    updateInput = cm.curOp.updateInput
+    var changeEvent = {from: from, to: to, text: multiPaste ? multiPaste[i$1 % multiPaste.length] : textLines,
+                       origin: origin || (paste ? "paste" : cm.state.cutIncoming ? "cut" : "+input")}
+    makeChange(cm.doc, changeEvent)
+    signalLater(cm, "inputRead", cm, changeEvent)
   }
+  if (inserted && !paste)
+    { triggerElectric(cm, inserted) }
 
-  // PROTOTYPE
+  ensureCursorVisible(cm)
+  cm.curOp.updateInput = updateInput
+  cm.curOp.typing = true
+  cm.state.pasteIncoming = cm.state.cutIncoming = false
+}
 
-  // The publicly visible API. Note that operation(null, f) means
-  // 'wrap f in an operation, performed on its `this` parameter'
+function handlePaste(e, cm) {
+  var pasted = e.clipboardData && e.clipboardData.getData("Text")
+  if (pasted) {
+    e.preventDefault()
+    if (!cm.isReadOnly() && !cm.options.disableInput)
+      { runInOp(cm, function () { return applyTextInput(cm, pasted, 0, null, "paste"); }) }
+    return true
+  }
+}
+
+function triggerElectric(cm, inserted) {
+  // When an 'electric' character is inserted, immediately trigger a reindent
+  if (!cm.options.electricChars || !cm.options.smartIndent) { return }
+  var sel = cm.doc.sel
+
+  for (var i = sel.ranges.length - 1; i >= 0; i--) {
+    var range = sel.ranges[i]
+    if (range.head.ch > 100 || (i && sel.ranges[i - 1].head.line == range.head.line)) { continue }
+    var mode = cm.getModeAt(range.head)
+    var indented = false
+    if (mode.electricChars) {
+      for (var j = 0; j < mode.electricChars.length; j++)
+        { if (inserted.indexOf(mode.electricChars.charAt(j)) > -1) {
+          indented = indentLine(cm, range.head.line, "smart")
+          break
+        } }
+    } else if (mode.electricInput) {
+      if (mode.electricInput.test(getLine(cm.doc, range.head.line).text.slice(0, range.head.ch)))
+        { indented = indentLine(cm, range.head.line, "smart") }
+    }
+    if (indented) { signalLater(cm, "electricInput", cm, range.head.line) }
+  }
+}
+
+function copyableRanges(cm) {
+  var text = [], ranges = []
+  for (var i = 0; i < cm.doc.sel.ranges.length; i++) {
+    var line = cm.doc.sel.ranges[i].head.line
+    var lineRange = {anchor: Pos(line, 0), head: Pos(line + 1, 0)}
+    ranges.push(lineRange)
+    text.push(cm.getRange(lineRange.anchor, lineRange.head))
+  }
+  return {text: text, ranges: ranges}
+}
+
+function disableBrowserMagic(field, spellcheck) {
+  field.setAttribute("autocorrect", "off")
+  field.setAttribute("autocapitalize", "off")
+  field.setAttribute("spellcheck", !!spellcheck)
+}
+
+function hiddenTextarea() {
+  var te = elt("textarea", null, null, "position: absolute; bottom: -1em; padding: 0; width: 1px; height: 1em; outline: none")
+  var div = elt("div", [te], null, "overflow: hidden; position: relative; width: 3px; height: 0px;")
+  // The textarea is kept positioned near the cursor to prevent the
+  // fact that it'll be scrolled into view on input from scrolling
+  // our fake cursor out of view. On webkit, when wrap=off, paste is
+  // very slow. So make the area wide instead.
+  if (webkit) { te.style.width = "1000px" }
+  else { te.setAttribute("wrap", "off") }
+  // If border: 0; -- iOS fails to open keyboard (issue #1287)
+  if (ios) { te.style.border = "1px solid black" }
+  disableBrowserMagic(te)
+  return div
+}
+
+// The publicly visible API. Note that methodOp(f) means
+// 'wrap f in an operation, performed on its `this` parameter'.
+
+// This is not the complete set of editor methods. Most of the
+// methods defined on the Doc type are also injected into
+// CodeMirror.prototype, for backwards compatibility and
+// convenience.
+
+function addEditorMethods(CodeMirror) {
+  var optionHandlers = CodeMirror.optionHandlers
+
+  var helpers = CodeMirror.helpers = {}
 
   CodeMirror.prototype = {
     constructor: CodeMirror,
-    focus: function(){window.focus(); focusInput(this); onFocus(this); fastPoll(this);},
+    focus: function(){window.focus(); this.display.input.focus()},
 
     setOption: function(option, value) {
-      var options = this.options, old = options[option];
-      if (options[option] == value && option != "mode") return;
-      options[option] = value;
+      var options = this.options, old = options[option]
+      if (options[option] == value && option != "mode") { return }
+      options[option] = value
       if (optionHandlers.hasOwnProperty(option))
-        operation(this, optionHandlers[option])(this, value, old);
+        { operation(this, optionHandlers[option])(this, value, old) }
+      signal(this, "optionChange", this, option)
     },
 
-    getOption: function(option) {return this.options[option];},
-    getDoc: function() {return this.doc;},
+    getOption: function(option) {return this.options[option]},
+    getDoc: function() {return this.doc},
 
     addKeyMap: function(map, bottom) {
-      this.state.keyMaps[bottom ? "push" : "unshift"](map);
+      this.state.keyMaps[bottom ? "push" : "unshift"](getKeyMap(map))
     },
     removeKeyMap: function(map) {
-      var maps = this.state.keyMaps;
+      var maps = this.state.keyMaps
       for (var i = 0; i < maps.length; ++i)
-        if (maps[i] == map || (typeof maps[i] != "string" && maps[i].name == map)) {
-          maps.splice(i, 1);
-          return true;
-        }
+        { if (maps[i] == map || maps[i].name == map) {
+          maps.splice(i, 1)
+          return true
+        } }
     },
 
-    addOverlay: operation(null, function(spec, options) {
-      var mode = spec.token ? spec : CodeMirror.getMode(this.options, spec);
-      if (mode.startState) throw new Error("Overlays may not be stateful.");
-      this.state.overlays.push({mode: mode, modeSpec: spec, opaque: options && options.opaque});
-      this.state.modeGen++;
-      regChange(this);
+    addOverlay: methodOp(function(spec, options) {
+      var mode = spec.token ? spec : CodeMirror.getMode(this.options, spec)
+      if (mode.startState) { throw new Error("Overlays may not be stateful.") }
+      insertSorted(this.state.overlays,
+                   {mode: mode, modeSpec: spec, opaque: options && options.opaque,
+                    priority: (options && options.priority) || 0},
+                   function (overlay) { return overlay.priority; })
+      this.state.modeGen++
+      regChange(this)
     }),
-    removeOverlay: operation(null, function(spec) {
-      var overlays = this.state.overlays;
+    removeOverlay: methodOp(function(spec) {
+      var this$1 = this;
+
+      var overlays = this.state.overlays
       for (var i = 0; i < overlays.length; ++i) {
-        var cur = overlays[i].modeSpec;
+        var cur = overlays[i].modeSpec
         if (cur == spec || typeof spec == "string" && cur.name == spec) {
-          overlays.splice(i, 1);
-          this.state.modeGen++;
-          regChange(this);
-          return;
+          overlays.splice(i, 1)
+          this$1.state.modeGen++
+          regChange(this$1)
+          return
         }
       }
     }),
 
-    indentLine: operation(null, function(n, dir, aggressive) {
+    indentLine: methodOp(function(n, dir, aggressive) {
       if (typeof dir != "string" && typeof dir != "number") {
-        if (dir == null) dir = this.options.smartIndent ? "smart" : "prev";
-        else dir = dir ? "add" : "subtract";
+        if (dir == null) { dir = this.options.smartIndent ? "smart" : "prev" }
+        else { dir = dir ? "add" : "subtract" }
       }
-      if (isLine(this.doc, n)) indentLine(this, n, dir, aggressive);
+      if (isLine(this.doc, n)) { indentLine(this, n, dir, aggressive) }
     }),
-    indentSelection: operation(null, function(how) {
-      var sel = this.doc.sel;
-      if (posEq(sel.from, sel.to)) return indentLine(this, sel.from.line, how);
-      var e = sel.to.line - (sel.to.ch ? 0 : 1);
-      for (var i = sel.from.line; i <= e; ++i) indentLine(this, i, how);
+    indentSelection: methodOp(function(how) {
+      var this$1 = this;
+
+      var ranges = this.doc.sel.ranges, end = -1
+      for (var i = 0; i < ranges.length; i++) {
+        var range = ranges[i]
+        if (!range.empty()) {
+          var from = range.from(), to = range.to()
+          var start = Math.max(end, from.line)
+          end = Math.min(this$1.lastLine(), to.line - (to.ch ? 0 : 1)) + 1
+          for (var j = start; j < end; ++j)
+            { indentLine(this$1, j, how) }
+          var newRanges = this$1.doc.sel.ranges
+          if (from.ch == 0 && ranges.length == newRanges.length && newRanges[i].from().ch > 0)
+            { replaceOneSelection(this$1.doc, i, new Range(from, newRanges[i].to()), sel_dontScroll) }
+        } else if (range.head.line > end) {
+          indentLine(this$1, range.head.line, how, true)
+          end = range.head.line
+          if (i == this$1.doc.sel.primIndex) { ensureCursorVisible(this$1) }
+        }
+      }
     }),
 
     // Fetch the parser token for a given character. Useful for hacks
     // that want to inspect the mode state (say, for completion).
     getTokenAt: function(pos, precise) {
-      var doc = this.doc;
-      pos = clipPos(doc, pos);
-      var state = getStateBefore(this, pos.line, precise), mode = this.doc.mode;
-      var line = getLine(doc, pos.line);
-      var stream = new StringStream(line.text, this.options.tabSize);
-      while (stream.pos < pos.ch && !stream.eol()) {
-        stream.start = stream.pos;
-        var style = mode.token(stream, state);
-      }
-      return {start: stream.start,
-              end: stream.pos,
-              string: stream.current(),
-              className: style || null, // Deprecated, use 'type' instead
-              type: style || null,
-              state: state};
+      return takeToken(this, pos, precise)
+    },
+
+    getLineTokens: function(line, precise) {
+      return takeToken(this, Pos(line), precise, true)
     },
 
     getTokenTypeAt: function(pos) {
-      pos = clipPos(this.doc, pos);
-      var styles = getLineStyles(this, getLine(this.doc, pos.line));
-      var before = 0, after = (styles.length - 1) / 2, ch = pos.ch;
-      if (ch == 0) return styles[2];
-      for (;;) {
-        var mid = (before + after) >> 1;
-        if ((mid ? styles[mid * 2 - 1] : 0) >= ch) after = mid;
-        else if (styles[mid * 2 + 1] < ch) before = mid + 1;
-        else return styles[mid * 2 + 2];
-      }
+      pos = clipPos(this.doc, pos)
+      var styles = getLineStyles(this, getLine(this.doc, pos.line))
+      var before = 0, after = (styles.length - 1) / 2, ch = pos.ch
+      var type
+      if (ch == 0) { type = styles[2] }
+      else { for (;;) {
+        var mid = (before + after) >> 1
+        if ((mid ? styles[mid * 2 - 1] : 0) >= ch) { after = mid }
+        else if (styles[mid * 2 + 1] < ch) { before = mid + 1 }
+        else { type = styles[mid * 2 + 2]; break }
+      } }
+      var cut = type ? type.indexOf("overlay ") : -1
+      return cut < 0 ? type : cut == 0 ? null : type.slice(0, cut - 1)
     },
 
     getModeAt: function(pos) {
-      var mode = this.doc.mode;
-      if (!mode.innerMode) return mode;
-      return CodeMirror.innerMode(mode, this.getTokenAt(pos).state).mode;
+      var mode = this.doc.mode
+      if (!mode.innerMode) { return mode }
+      return CodeMirror.innerMode(mode, this.getTokenAt(pos).state).mode
     },
 
     getHelper: function(pos, type) {
-      if (!helpers.hasOwnProperty(type)) return;
-      var help = helpers[type], mode = this.getModeAt(pos);
-      return mode[type] && help[mode[type]] ||
-        mode.helperType && help[mode.helperType] ||
-        help[mode.name];
+      return this.getHelpers(pos, type)[0]
+    },
+
+    getHelpers: function(pos, type) {
+      var this$1 = this;
+
+      var found = []
+      if (!helpers.hasOwnProperty(type)) { return found }
+      var help = helpers[type], mode = this.getModeAt(pos)
+      if (typeof mode[type] == "string") {
+        if (help[mode[type]]) { found.push(help[mode[type]]) }
+      } else if (mode[type]) {
+        for (var i = 0; i < mode[type].length; i++) {
+          var val = help[mode[type][i]]
+          if (val) { found.push(val) }
+        }
+      } else if (mode.helperType && help[mode.helperType]) {
+        found.push(help[mode.helperType])
+      } else if (help[mode.name]) {
+        found.push(help[mode.name])
+      }
+      for (var i$1 = 0; i$1 < help._global.length; i$1++) {
+        var cur = help._global[i$1]
+        if (cur.pred(mode, this$1) && indexOf(found, cur.val) == -1)
+          { found.push(cur.val) }
+      }
+      return found
     },
 
     getStateAfter: function(line, precise) {
-      var doc = this.doc;
-      line = clipLine(doc, line == null ? doc.first + doc.size - 1: line);
-      return getStateBefore(this, line + 1, precise);
+      var doc = this.doc
+      line = clipLine(doc, line == null ? doc.first + doc.size - 1: line)
+      return getStateBefore(this, line + 1, precise)
     },
 
     cursorCoords: function(start, mode) {
-      var pos, sel = this.doc.sel;
-      if (start == null) pos = sel.head;
-      else if (typeof start == "object") pos = clipPos(this.doc, start);
-      else pos = start ? sel.from : sel.to;
-      return cursorCoords(this, pos, mode || "page");
+      var pos, range = this.doc.sel.primary()
+      if (start == null) { pos = range.head }
+      else if (typeof start == "object") { pos = clipPos(this.doc, start) }
+      else { pos = start ? range.from() : range.to() }
+      return cursorCoords(this, pos, mode || "page")
     },
 
     charCoords: function(pos, mode) {
-      return charCoords(this, clipPos(this.doc, pos), mode || "page");
+      return charCoords(this, clipPos(this.doc, pos), mode || "page")
     },
 
     coordsChar: function(coords, mode) {
-      coords = fromCoordSystem(this, coords, mode || "page");
-      return coordsChar(this, coords.left, coords.top);
+      coords = fromCoordSystem(this, coords, mode || "page")
+      return coordsChar(this, coords.left, coords.top)
     },
 
     lineAtHeight: function(height, mode) {
-      height = fromCoordSystem(this, {top: height, left: 0}, mode || "page").top;
-      return lineAtHeight(this.doc, height + this.display.viewOffset);
+      height = fromCoordSystem(this, {top: height, left: 0}, mode || "page").top
+      return lineAtHeight(this.doc, height + this.display.viewOffset)
     },
-    heightAtLine: function(line, mode) {
-      var end = false, last = this.doc.first + this.doc.size - 1;
-      if (line < this.doc.first) line = this.doc.first;
-      else if (line > last) { line = last; end = true; }
-      var lineObj = getLine(this.doc, line);
-      return intoCoordSystem(this, getLine(this.doc, line), {top: 0, left: 0}, mode || "page").top +
-        (end ? lineObj.height : 0);
-    },
-
-    defaultTextHeight: function() { return textHeight(this.display); },
-    defaultCharWidth: function() { return charWidth(this.display); },
-
-    setGutterMarker: operation(null, function(line, gutterID, value) {
-      return changeLine(this, line, function(line) {
-        var markers = line.gutterMarkers || (line.gutterMarkers = {});
-        markers[gutterID] = value;
-        if (!value && isEmpty(markers)) line.gutterMarkers = null;
-        return true;
-      });
-    }),
-
-    clearGutter: operation(null, function(gutterID) {
-      var cm = this, doc = cm.doc, i = doc.first;
-      doc.iter(function(line) {
-        if (line.gutterMarkers && line.gutterMarkers[gutterID]) {
-          line.gutterMarkers[gutterID] = null;
-          regChange(cm, i, i + 1);
-          if (isEmpty(line.gutterMarkers)) line.gutterMarkers = null;
-        }
-        ++i;
-      });
-    }),
-
-    addLineClass: operation(null, function(handle, where, cls) {
-      return changeLine(this, handle, function(line) {
-        var prop = where == "text" ? "textClass" : where == "background" ? "bgClass" : "wrapClass";
-        if (!line[prop]) line[prop] = cls;
-        else if (new RegExp("(?:^|\\s)" + cls + "(?:$|\\s)").test(line[prop])) return false;
-        else line[prop] += " " + cls;
-        return true;
-      });
-    }),
-
-    removeLineClass: operation(null, function(handle, where, cls) {
-      return changeLine(this, handle, function(line) {
-        var prop = where == "text" ? "textClass" : where == "background" ? "bgClass" : "wrapClass";
-        var cur = line[prop];
-        if (!cur) return false;
-        else if (cls == null) line[prop] = null;
-        else {
-          var found = cur.match(new RegExp("(?:^|\\s+)" + cls + "(?:$|\\s+)"));
-          if (!found) return false;
-          var end = found.index + found[0].length;
-          line[prop] = cur.slice(0, found.index) + (!found.index || end == cur.length ? "" : " ") + cur.slice(end) || null;
-        }
-        return true;
-      });
-    }),
-
-    addLineWidget: operation(null, function(handle, node, options) {
-      return addLineWidget(this, handle, node, options);
-    }),
-
-    removeLineWidget: function(widget) { widget.clear(); },
-
-    lineInfo: function(line) {
+    heightAtLine: function(line, mode, includeWidgets) {
+      var end = false, lineObj
       if (typeof line == "number") {
-        if (!isLine(this.doc, line)) return null;
-        var n = line;
-        line = getLine(this.doc, line);
-        if (!line) return null;
+        var last = this.doc.first + this.doc.size - 1
+        if (line < this.doc.first) { line = this.doc.first }
+        else if (line > last) { line = last; end = true }
+        lineObj = getLine(this.doc, line)
       } else {
-        var n = lineNo(line);
-        if (n == null) return null;
+        lineObj = line
       }
-      return {line: n, handle: line, text: line.text, gutterMarkers: line.gutterMarkers,
-              textClass: line.textClass, bgClass: line.bgClass, wrapClass: line.wrapClass,
-              widgets: line.widgets};
+      return intoCoordSystem(this, lineObj, {top: 0, left: 0}, mode || "page", includeWidgets || end).top +
+        (end ? this.doc.height - heightAtLine(lineObj) : 0)
     },
 
-    getViewport: function() { return {from: this.display.showingFrom, to: this.display.showingTo};},
+    defaultTextHeight: function() { return textHeight(this.display) },
+    defaultCharWidth: function() { return charWidth(this.display) },
+
+    getViewport: function() { return {from: this.display.viewFrom, to: this.display.viewTo}},
 
     addWidget: function(pos, node, scroll, vert, horiz) {
-      var display = this.display;
-      pos = cursorCoords(this, clipPos(this.doc, pos));
-      var top = pos.bottom, left = pos.left;
-      node.style.position = "absolute";
-      display.sizer.appendChild(node);
+      var display = this.display
+      pos = cursorCoords(this, clipPos(this.doc, pos))
+      var top = pos.bottom, left = pos.left
+      node.style.position = "absolute"
+      node.setAttribute("cm-ignore-events", "true")
+      this.display.input.setUneditable(node)
+      display.sizer.appendChild(node)
       if (vert == "over") {
-        top = pos.top;
+        top = pos.top
       } else if (vert == "above" || vert == "near") {
         var vspace = Math.max(display.wrapper.clientHeight, this.doc.height),
-        hspace = Math.max(display.sizer.clientWidth, display.lineSpace.clientWidth);
+        hspace = Math.max(display.sizer.clientWidth, display.lineSpace.clientWidth)
         // Default to positioning above (if specified and possible); otherwise default to positioning below
         if ((vert == 'above' || pos.bottom + node.offsetHeight > vspace) && pos.top > node.offsetHeight)
-          top = pos.top - node.offsetHeight;
+          { top = pos.top - node.offsetHeight }
         else if (pos.bottom + node.offsetHeight <= vspace)
-          top = pos.bottom;
+          { top = pos.bottom }
         if (left + node.offsetWidth > hspace)
-          left = hspace - node.offsetWidth;
+          { left = hspace - node.offsetWidth }
       }
-      node.style.top = top + "px";
-      node.style.left = node.style.right = "";
+      node.style.top = top + "px"
+      node.style.left = node.style.right = ""
       if (horiz == "right") {
-        left = display.sizer.clientWidth - node.offsetWidth;
-        node.style.right = "0px";
+        left = display.sizer.clientWidth - node.offsetWidth
+        node.style.right = "0px"
       } else {
-        if (horiz == "left") left = 0;
-        else if (horiz == "middle") left = (display.sizer.clientWidth - node.offsetWidth) / 2;
-        node.style.left = left + "px";
+        if (horiz == "left") { left = 0 }
+        else if (horiz == "middle") { left = (display.sizer.clientWidth - node.offsetWidth) / 2 }
+        node.style.left = left + "px"
       }
       if (scroll)
-        scrollIntoView(this, left, top, left + node.offsetWidth, top + node.offsetHeight);
+        { scrollIntoView(this, {left: left, top: top, right: left + node.offsetWidth, bottom: top + node.offsetHeight}) }
     },
 
-    triggerOnKeyDown: operation(null, onKeyDown),
+    triggerOnKeyDown: methodOp(onKeyDown),
+    triggerOnKeyPress: methodOp(onKeyPress),
+    triggerOnKeyUp: onKeyUp,
 
-    execCommand: function(cmd) {return commands[cmd](this);},
+    execCommand: function(cmd) {
+      if (commands.hasOwnProperty(cmd))
+        { return commands[cmd].call(null, this) }
+    },
+
+    triggerElectric: methodOp(function(text) { triggerElectric(this, text) }),
 
     findPosH: function(from, amount, unit, visually) {
-      var dir = 1;
-      if (amount < 0) { dir = -1; amount = -amount; }
-      for (var i = 0, cur = clipPos(this.doc, from); i < amount; ++i) {
-        cur = findPosH(this.doc, cur, dir, unit, visually);
-        if (cur.hitSide) break;
+      var this$1 = this;
+
+      var dir = 1
+      if (amount < 0) { dir = -1; amount = -amount }
+      var cur = clipPos(this.doc, from)
+      for (var i = 0; i < amount; ++i) {
+        cur = findPosH(this$1.doc, cur, dir, unit, visually)
+        if (cur.hitSide) { break }
       }
-      return cur;
+      return cur
     },
 
-    moveH: operation(null, function(dir, unit) {
-      var sel = this.doc.sel, pos;
-      if (sel.shift || sel.extend || posEq(sel.from, sel.to))
-        pos = findPosH(this.doc, sel.head, dir, unit, this.options.rtlMoveVisually);
-      else
-        pos = dir < 0 ? sel.from : sel.to;
-      extendSelection(this.doc, pos, pos, dir);
+    moveH: methodOp(function(dir, unit) {
+      var this$1 = this;
+
+      this.extendSelectionsBy(function (range) {
+        if (this$1.display.shift || this$1.doc.extend || range.empty())
+          { return findPosH(this$1.doc, range.head, dir, unit, this$1.options.rtlMoveVisually) }
+        else
+          { return dir < 0 ? range.from() : range.to() }
+      }, sel_move)
     }),
 
-    deleteH: operation(null, function(dir, unit) {
-      var sel = this.doc.sel;
-      if (!posEq(sel.from, sel.to)) replaceRange(this.doc, "", sel.from, sel.to, "+delete");
-      else replaceRange(this.doc, "", sel.from, findPosH(this.doc, sel.head, dir, unit, false), "+delete");
-      this.curOp.userSelChange = true;
+    deleteH: methodOp(function(dir, unit) {
+      var sel = this.doc.sel, doc = this.doc
+      if (sel.somethingSelected())
+        { doc.replaceSelection("", null, "+delete") }
+      else
+        { deleteNearSelection(this, function (range) {
+          var other = findPosH(doc, range.head, dir, unit, false)
+          return dir < 0 ? {from: other, to: range.head} : {from: range.head, to: other}
+        }) }
     }),
 
     findPosV: function(from, amount, unit, goalColumn) {
-      var dir = 1, x = goalColumn;
-      if (amount < 0) { dir = -1; amount = -amount; }
-      for (var i = 0, cur = clipPos(this.doc, from); i < amount; ++i) {
-        var coords = cursorCoords(this, cur, "div");
-        if (x == null) x = coords.left;
-        else coords.left = x;
-        cur = findPosV(this, coords, dir, unit);
-        if (cur.hitSide) break;
+      var this$1 = this;
+
+      var dir = 1, x = goalColumn
+      if (amount < 0) { dir = -1; amount = -amount }
+      var cur = clipPos(this.doc, from)
+      for (var i = 0; i < amount; ++i) {
+        var coords = cursorCoords(this$1, cur, "div")
+        if (x == null) { x = coords.left }
+        else { coords.left = x }
+        cur = findPosV(this$1, coords, dir, unit)
+        if (cur.hitSide) { break }
       }
-      return cur;
+      return cur
     },
 
-    moveV: operation(null, function(dir, unit) {
-      var sel = this.doc.sel;
-      var pos = cursorCoords(this, sel.head, "div");
-      if (sel.goalColumn != null) pos.left = sel.goalColumn;
-      var target = findPosV(this, pos, dir, unit);
+    moveV: methodOp(function(dir, unit) {
+      var this$1 = this;
 
-      if (unit == "page") addToScrollPos(this, 0, charCoords(this, target, "div").top - pos.top);
-      extendSelection(this.doc, target, target, dir);
-      sel.goalColumn = pos.left;
+      var doc = this.doc, goals = []
+      var collapse = !this.display.shift && !doc.extend && doc.sel.somethingSelected()
+      doc.extendSelectionsBy(function (range) {
+        if (collapse)
+          { return dir < 0 ? range.from() : range.to() }
+        var headPos = cursorCoords(this$1, range.head, "div")
+        if (range.goalColumn != null) { headPos.left = range.goalColumn }
+        goals.push(headPos.left)
+        var pos = findPosV(this$1, headPos, dir, unit)
+        if (unit == "page" && range == doc.sel.primary())
+          { addToScrollPos(this$1, null, charCoords(this$1, pos, "div").top - headPos.top) }
+        return pos
+      }, sel_move)
+      if (goals.length) { for (var i = 0; i < doc.sel.ranges.length; i++)
+        { doc.sel.ranges[i].goalColumn = goals[i] } }
     }),
 
+    // Find the word at the given position (as returned by coordsChar).
+    findWordAt: function(pos) {
+      var doc = this.doc, line = getLine(doc, pos.line).text
+      var start = pos.ch, end = pos.ch
+      if (line) {
+        var helper = this.getHelper(pos, "wordChars")
+        if ((pos.sticky == "before" || end == line.length) && start) { --start; } else { ++end }
+        var startChar = line.charAt(start)
+        var check = isWordChar(startChar, helper)
+          ? function (ch) { return isWordChar(ch, helper); }
+          : /\s/.test(startChar) ? function (ch) { return /\s/.test(ch); }
+          : function (ch) { return (!/\s/.test(ch) && !isWordChar(ch)); }
+        while (start > 0 && check(line.charAt(start - 1))) { --start }
+        while (end < line.length && check(line.charAt(end))) { ++end }
+      }
+      return new Range(Pos(pos.line, start), Pos(pos.line, end))
+    },
+
     toggleOverwrite: function(value) {
-      if (value != null && value == this.state.overwrite) return;
+      if (value != null && value == this.state.overwrite) { return }
       if (this.state.overwrite = !this.state.overwrite)
-        this.display.cursor.className += " CodeMirror-overwrite";
+        { addClass(this.display.cursorDiv, "CodeMirror-overwrite") }
       else
-        this.display.cursor.className = this.display.cursor.className.replace(" CodeMirror-overwrite", "");
-    },
-    hasFocus: function() { return this.state.focused; },
+        { rmClass(this.display.cursorDiv, "CodeMirror-overwrite") }
 
-    scrollTo: operation(null, function(x, y) {
-      updateScrollPos(this, x, y);
+      signal(this, "overwriteToggle", this, this.state.overwrite)
+    },
+    hasFocus: function() { return this.display.input.getField() == activeElt() },
+    isReadOnly: function() { return !!(this.options.readOnly || this.doc.cantEdit) },
+
+    scrollTo: methodOp(function(x, y) {
+      if (x != null || y != null) { resolveScrollToPos(this) }
+      if (x != null) { this.curOp.scrollLeft = x }
+      if (y != null) { this.curOp.scrollTop = y }
     }),
     getScrollInfo: function() {
-      var scroller = this.display.scroller, co = scrollerCutOff;
+      var scroller = this.display.scroller
       return {left: scroller.scrollLeft, top: scroller.scrollTop,
-              height: scroller.scrollHeight - co, width: scroller.scrollWidth - co,
-              clientHeight: scroller.clientHeight - co, clientWidth: scroller.clientWidth - co};
+              height: scroller.scrollHeight - scrollGap(this) - this.display.barHeight,
+              width: scroller.scrollWidth - scrollGap(this) - this.display.barWidth,
+              clientHeight: displayHeight(this), clientWidth: displayWidth(this)}
     },
 
-    scrollIntoView: operation(null, function(pos, margin) {
-      if (typeof pos == "number") pos = Pos(pos, 0);
-      if (!margin) margin = 0;
-      var coords = pos;
-
-      if (!pos || pos.line != null) {
-        this.curOp.scrollToPos = pos ? clipPos(this.doc, pos) : this.doc.sel.head;
-        this.curOp.scrollToPosMargin = margin;
-        coords = cursorCoords(this, this.curOp.scrollToPos);
+    scrollIntoView: methodOp(function(range, margin) {
+      if (range == null) {
+        range = {from: this.doc.sel.primary().head, to: null}
+        if (margin == null) { margin = this.options.cursorScrollMargin }
+      } else if (typeof range == "number") {
+        range = {from: Pos(range, 0), to: null}
+      } else if (range.from == null) {
+        range = {from: range, to: null}
       }
-      var sPos = calculateScrollPos(this, coords.left, coords.top - margin, coords.right, coords.bottom + margin);
-      updateScrollPos(this, sPos.scrollLeft, sPos.scrollTop);
-    }),
+      if (!range.to) { range.to = range.from }
+      range.margin = margin || 0
 
-    setSize: operation(null, function(width, height) {
-      function interpret(val) {
-        return typeof val == "number" || /^\d+$/.test(String(val)) ? val + "px" : val;
+      if (range.from.line != null) {
+        resolveScrollToPos(this)
+        this.curOp.scrollToPos = range
+      } else {
+        var sPos = calculateScrollPos(this, {
+          left: Math.min(range.from.left, range.to.left),
+          top: Math.min(range.from.top, range.to.top) - range.margin,
+          right: Math.max(range.from.right, range.to.right),
+          bottom: Math.max(range.from.bottom, range.to.bottom) + range.margin
+        })
+        this.scrollTo(sPos.scrollLeft, sPos.scrollTop)
       }
-      if (width != null) this.display.wrapper.style.width = interpret(width);
-      if (height != null) this.display.wrapper.style.height = interpret(height);
-      if (this.options.lineWrapping)
-        this.display.measureLineCache.length = this.display.measureLineCachePos = 0;
-      this.curOp.forceUpdate = true;
     }),
 
-    operation: function(f){return runInOp(this, f);},
+    setSize: methodOp(function(width, height) {
+      var this$1 = this;
 
-    refresh: operation(null, function() {
-      clearCaches(this);
-      updateScrollPos(this, this.doc.scrollLeft, this.doc.scrollTop);
-      regChange(this);
+      var interpret = function (val) { return typeof val == "number" || /^\d+$/.test(String(val)) ? val + "px" : val; }
+      if (width != null) { this.display.wrapper.style.width = interpret(width) }
+      if (height != null) { this.display.wrapper.style.height = interpret(height) }
+      if (this.options.lineWrapping) { clearLineMeasurementCache(this) }
+      var lineNo = this.display.viewFrom
+      this.doc.iter(lineNo, this.display.viewTo, function (line) {
+        if (line.widgets) { for (var i = 0; i < line.widgets.length; i++)
+          { if (line.widgets[i].noHScroll) { regLineChange(this$1, lineNo, "widget"); break } } }
+        ++lineNo
+      })
+      this.curOp.forceUpdate = true
+      signal(this, "refresh", this)
     }),
 
-    swapDoc: operation(null, function(doc) {
-      var old = this.doc;
-      old.cm = null;
-      attachDoc(this, doc);
-      clearCaches(this);
-      resetInput(this, true);
-      updateScrollPos(this, doc.scrollLeft, doc.scrollTop);
-      return old;
+    operation: function(f){return runInOp(this, f)},
+
+    refresh: methodOp(function() {
+      var oldHeight = this.display.cachedTextHeight
+      regChange(this)
+      this.curOp.forceUpdate = true
+      clearCaches(this)
+      this.scrollTo(this.doc.scrollLeft, this.doc.scrollTop)
+      updateGutterSpace(this)
+      if (oldHeight == null || Math.abs(oldHeight - textHeight(this.display)) > .5)
+        { estimateLineHeights(this) }
+      signal(this, "refresh", this)
     }),
 
-    getInputField: function(){return this.display.input;},
-    getWrapperElement: function(){return this.display.wrapper;},
-    getScrollerElement: function(){return this.display.scroller;},
-    getGutterElement: function(){return this.display.gutters;}
-  };
-  eventMixin(CodeMirror);
+    swapDoc: methodOp(function(doc) {
+      var old = this.doc
+      old.cm = null
+      attachDoc(this, doc)
+      clearCaches(this)
+      this.display.input.reset()
+      this.scrollTo(doc.scrollLeft, doc.scrollTop)
+      this.curOp.forceScroll = true
+      signalLater(this, "swapDoc", this, old)
+      return old
+    }),
 
-  // OPTION DEFAULTS
-
-  var optionHandlers = CodeMirror.optionHandlers = {};
-
-  // The default configuration options.
-  var defaults = CodeMirror.defaults = {};
-
-  function option(name, deflt, handle, notOnInit) {
-    CodeMirror.defaults[name] = deflt;
-    if (handle) optionHandlers[name] =
-      notOnInit ? function(cm, val, old) {if (old != Init) handle(cm, val, old);} : handle;
+    getInputField: function(){return this.display.input.getField()},
+    getWrapperElement: function(){return this.display.wrapper},
+    getScrollerElement: function(){return this.display.scroller},
+    getGutterElement: function(){return this.display.gutters}
   }
+  eventMixin(CodeMirror)
 
-  var Init = CodeMirror.Init = {toString: function(){return "CodeMirror.Init";}};
-
-  // These two are, on init, called from the constructor because they
-  // have to be initialized before the editor can start at all.
-  option("value", "", function(cm, val) {
-    cm.setValue(val);
-  }, true);
-  option("mode", null, function(cm, val) {
-    cm.doc.modeOption = val;
-    loadMode(cm);
-  }, true);
-
-  option("indentUnit", 2, loadMode, true);
-  option("indentWithTabs", false);
-  option("smartIndent", true);
-  option("tabSize", 4, function(cm) {
-    loadMode(cm);
-    clearCaches(cm);
-    regChange(cm);
-  }, true);
-  option("electricChars", true);
-  option("rtlMoveVisually", !windows);
-
-  option("theme", "default", function(cm) {
-    themeChanged(cm);
-    guttersChanged(cm);
-  }, true);
-  option("keyMap", "default", keyMapChanged);
-  option("extraKeys", null);
-
-  option("onKeyEvent", null);
-  option("onDragEvent", null);
-
-  option("lineWrapping", false, wrappingChanged, true);
-  option("gutters", [], function(cm) {
-    setGuttersForLineNumbers(cm.options);
-    guttersChanged(cm);
-  }, true);
-  option("fixedGutter", true, function(cm, val) {
-    cm.display.gutters.style.left = val ? compensateForHScroll(cm.display) + "px" : "0";
-    cm.refresh();
-  }, true);
-  option("coverGutterNextToScrollbar", false, updateScrollbars, true);
-  option("lineNumbers", false, function(cm) {
-    setGuttersForLineNumbers(cm.options);
-    guttersChanged(cm);
-  }, true);
-  option("firstLineNumber", 1, guttersChanged, true);
-  option("lineNumberFormatter", function(integer) {return integer;}, guttersChanged, true);
-  option("showCursorWhenSelecting", false, updateSelection, true);
-
-  option("readOnly", false, function(cm, val) {
-    if (val == "nocursor") {onBlur(cm); cm.display.input.blur();}
-    else if (!val) resetInput(cm, true);
-  });
-  option("dragDrop", true);
-
-  option("cursorBlinkRate", 530);
-  option("cursorScrollMargin", 0);
-  option("cursorHeight", 1);
-  option("workTime", 100);
-  option("workDelay", 100);
-  option("flattenSpans", true);
-  option("pollInterval", 100);
-  option("undoDepth", 40, function(cm, val){cm.doc.history.undoDepth = val;});
-  option("historyEventDelay", 500);
-  option("viewportMargin", 10, function(cm){cm.refresh();}, true);
-  option("maxHighlightLength", 10000, function(cm){loadMode(cm); cm.refresh();}, true);
-  option("moveInputWithCursor", true, function(cm, val) {
-    if (!val) cm.display.inputDiv.style.top = cm.display.inputDiv.style.left = 0;
-  });
-
-  option("tabindex", null, function(cm, val) {
-    cm.display.input.tabIndex = val || "";
-  });
-  option("autofocus", null);
-
-  // MODE DEFINITION AND QUERYING
-
-  // Known modes, by name and by MIME
-  var modes = CodeMirror.modes = {}, mimeModes = CodeMirror.mimeModes = {};
-
-  CodeMirror.defineMode = function(name, mode) {
-    if (!CodeMirror.defaults.mode && name != "null") CodeMirror.defaults.mode = name;
-    if (arguments.length > 2) {
-      mode.dependencies = [];
-      for (var i = 2; i < arguments.length; ++i) mode.dependencies.push(arguments[i]);
-    }
-    modes[name] = mode;
-  };
-
-  CodeMirror.defineMIME = function(mime, spec) {
-    mimeModes[mime] = spec;
-  };
-
-  CodeMirror.resolveMode = function(spec) {
-    if (typeof spec == "string" && mimeModes.hasOwnProperty(spec)) {
-      spec = mimeModes[spec];
-    } else if (spec && typeof spec.name == "string" && mimeModes.hasOwnProperty(spec.name)) {
-      var found = mimeModes[spec.name];
-      spec = createObj(found, spec);
-      spec.name = found.name;
-    } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec)) {
-      return CodeMirror.resolveMode("application/xml");
-    }
-    if (typeof spec == "string") return {name: spec};
-    else return spec || {name: "null"};
-  };
-
-  CodeMirror.getMode = function(options, spec) {
-    var spec = CodeMirror.resolveMode(spec);
-    var mfactory = modes[spec.name];
-    if (!mfactory) return CodeMirror.getMode(options, "text/plain");
-    var modeObj = mfactory(options, spec);
-    if (modeExtensions.hasOwnProperty(spec.name)) {
-      var exts = modeExtensions[spec.name];
-      for (var prop in exts) {
-        if (!exts.hasOwnProperty(prop)) continue;
-        if (modeObj.hasOwnProperty(prop)) modeObj["_" + prop] = modeObj[prop];
-        modeObj[prop] = exts[prop];
-      }
-    }
-    modeObj.name = spec.name;
-
-    return modeObj;
-  };
-
-  CodeMirror.defineMode("null", function() {
-    return {token: function(stream) {stream.skipToEnd();}};
-  });
-  CodeMirror.defineMIME("text/plain", "null");
-
-  var modeExtensions = CodeMirror.modeExtensions = {};
-  CodeMirror.extendMode = function(mode, properties) {
-    var exts = modeExtensions.hasOwnProperty(mode) ? modeExtensions[mode] : (modeExtensions[mode] = {});
-    copyObj(properties, exts);
-  };
-
-  // EXTENSIONS
-
-  CodeMirror.defineExtension = function(name, func) {
-    CodeMirror.prototype[name] = func;
-  };
-  CodeMirror.defineDocExtension = function(name, func) {
-    Doc.prototype[name] = func;
-  };
-  CodeMirror.defineOption = option;
-
-  var initHooks = [];
-  CodeMirror.defineInitHook = function(f) {initHooks.push(f);};
-
-  var helpers = CodeMirror.helpers = {};
   CodeMirror.registerHelper = function(type, name, value) {
-    if (!helpers.hasOwnProperty(type)) helpers[type] = CodeMirror[type] = {};
-    helpers[type][name] = value;
-  };
+    if (!helpers.hasOwnProperty(type)) { helpers[type] = CodeMirror[type] = {_global: []} }
+    helpers[type][name] = value
+  }
+  CodeMirror.registerGlobalHelper = function(type, name, predicate, value) {
+    CodeMirror.registerHelper(type, name, value)
+    helpers[type]._global.push({pred: predicate, val: value})
+  }
+}
 
-  // UTILITIES
-
-  CodeMirror.isWordChar = isWordChar;
-
-  // MODE STATE HANDLING
-
-  // Utility functions for working with state. Exported because modes
-  // sometimes need to do this.
-  function copyState(mode, state) {
-    if (state === true) return state;
-    if (mode.copyState) return mode.copyState(state);
-    var nstate = {};
-    for (var n in state) {
-      var val = state[n];
-      if (val instanceof Array) val = val.concat([]);
-      nstate[n] = val;
+// Used for horizontal relative motion. Dir is -1 or 1 (left or
+// right), unit can be "char", "column" (like char, but doesn't
+// cross line boundaries), "word" (across next word), or "group" (to
+// the start of next group of word or non-word-non-whitespace
+// chars). The visually param controls whether, in right-to-left
+// text, direction 1 means to move towards the next index in the
+// string, or towards the character to the right of the current
+// position. The resulting position will have a hitSide=true
+// property if it reached the end of the document.
+function findPosH(doc, pos, dir, unit, visually) {
+  var oldPos = pos
+  var origDir = dir
+  var lineObj = getLine(doc, pos.line)
+  function findNextLine() {
+    var l = pos.line + dir
+    if (l < doc.first || l >= doc.first + doc.size) { return false }
+    pos = new Pos(l, pos.ch, pos.sticky)
+    return lineObj = getLine(doc, l)
+  }
+  function moveOnce(boundToLine) {
+    var next
+    if (visually) {
+      next = moveVisually(doc.cm, lineObj, pos, dir)
+    } else {
+      next = moveLogically(lineObj, pos, dir)
     }
-    return nstate;
-  }
-  CodeMirror.copyState = copyState;
-
-  function startState(mode, a1, a2) {
-    return mode.startState ? mode.startState(a1, a2) : true;
-  }
-  CodeMirror.startState = startState;
-
-  CodeMirror.innerMode = function(mode, state) {
-    while (mode.innerMode) {
-      var info = mode.innerMode(state);
-      if (!info || info.mode == mode) break;
-      state = info.state;
-      mode = info.mode;
+    if (next == null) {
+      if (!boundToLine && findNextLine())
+        { pos = endOfLine(visually, doc.cm, lineObj, pos.line, dir) }
+      else
+        { return false }
+    } else {
+      pos = next
     }
-    return info || {mode: mode, state: state};
-  };
-
-  // STANDARD COMMANDS
-
-  var commands = CodeMirror.commands = {
-    selectAll: function(cm) {cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()));},
-    killLine: function(cm) {
-      var from = cm.getCursor(true), to = cm.getCursor(false), sel = !posEq(from, to);
-      if (!sel && cm.getLine(from.line).length == from.ch)
-        cm.replaceRange("", from, Pos(from.line + 1, 0), "+delete");
-      else cm.replaceRange("", from, sel ? to : Pos(from.line), "+delete");
-    },
-    deleteLine: function(cm) {
-      var l = cm.getCursor().line;
-      cm.replaceRange("", Pos(l, 0), Pos(l), "+delete");
-    },
-    delLineLeft: function(cm) {
-      var cur = cm.getCursor();
-      cm.replaceRange("", Pos(cur.line, 0), cur, "+delete");
-    },
-    undo: function(cm) {cm.undo();},
-    redo: function(cm) {cm.redo();},
-    goDocStart: function(cm) {cm.extendSelection(Pos(cm.firstLine(), 0));},
-    goDocEnd: function(cm) {cm.extendSelection(Pos(cm.lastLine()));},
-    goLineStart: function(cm) {
-      cm.extendSelection(lineStart(cm, cm.getCursor().line));
-    },
-    goLineStartSmart: function(cm) {
-      var cur = cm.getCursor(), start = lineStart(cm, cur.line);
-      var line = cm.getLineHandle(start.line);
-      var order = getOrder(line);
-      if (!order || order[0].level == 0) {
-        var firstNonWS = Math.max(0, line.text.search(/\S/));
-        var inWS = cur.line == start.line && cur.ch <= firstNonWS && cur.ch;
-        cm.extendSelection(Pos(start.line, inWS ? 0 : firstNonWS));
-      } else cm.extendSelection(start);
-    },
-    goLineEnd: function(cm) {
-      cm.extendSelection(lineEnd(cm, cm.getCursor().line));
-    },
-    goLineRight: function(cm) {
-      var top = cm.charCoords(cm.getCursor(), "div").top + 5;
-      cm.extendSelection(cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div"));
-    },
-    goLineLeft: function(cm) {
-      var top = cm.charCoords(cm.getCursor(), "div").top + 5;
-      cm.extendSelection(cm.coordsChar({left: 0, top: top}, "div"));
-    },
-    goLineUp: function(cm) {cm.moveV(-1, "line");},
-    goLineDown: function(cm) {cm.moveV(1, "line");},
-    goPageUp: function(cm) {cm.moveV(-1, "page");},
-    goPageDown: function(cm) {cm.moveV(1, "page");},
-    goCharLeft: function(cm) {cm.moveH(-1, "char");},
-    goCharRight: function(cm) {cm.moveH(1, "char");},
-    goColumnLeft: function(cm) {cm.moveH(-1, "column");},
-    goColumnRight: function(cm) {cm.moveH(1, "column");},
-    goWordLeft: function(cm) {cm.moveH(-1, "word");},
-    goGroupRight: function(cm) {cm.moveH(1, "group");},
-    goGroupLeft: function(cm) {cm.moveH(-1, "group");},
-    goWordRight: function(cm) {cm.moveH(1, "word");},
-    delCharBefore: function(cm) {cm.deleteH(-1, "char");},
-    delCharAfter: function(cm) {cm.deleteH(1, "char");},
-    delWordBefore: function(cm) {cm.deleteH(-1, "word");},
-    delWordAfter: function(cm) {cm.deleteH(1, "word");},
-    delGroupBefore: function(cm) {cm.deleteH(-1, "group");},
-    delGroupAfter: function(cm) {cm.deleteH(1, "group");},
-    indentAuto: function(cm) {cm.indentSelection("smart");},
-    indentMore: function(cm) {cm.indentSelection("add");},
-    indentLess: function(cm) {cm.indentSelection("subtract");},
-    insertTab: function(cm) {cm.replaceSelection("\t", "end", "+input");},
-    defaultTab: function(cm) {
-      if (cm.somethingSelected()) cm.indentSelection("add");
-      else cm.replaceSelection("\t", "end", "+input");
-    },
-    transposeChars: function(cm) {
-      var cur = cm.getCursor(), line = cm.getLine(cur.line);
-      if (cur.ch > 0 && cur.ch < line.length - 1)
-        cm.replaceRange(line.charAt(cur.ch) + line.charAt(cur.ch - 1),
-                        Pos(cur.line, cur.ch - 1), Pos(cur.line, cur.ch + 1));
-    },
-    newlineAndIndent: function(cm) {
-      operation(cm, function() {
-        cm.replaceSelection("\n", "end", "+input");
-        cm.indentLine(cm.getCursor().line, null, true);
-      })();
-    },
-    toggleOverwrite: function(cm) {cm.toggleOverwrite();}
-  };
-
-  // STANDARD KEYMAPS
-
-  var keyMap = CodeMirror.keyMap = {};
-  keyMap.basic = {
-    "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",
-    "End": "goLineEnd", "Home": "goLineStartSmart", "PageUp": "goPageUp", "PageDown": "goPageDown",
-    "Delete": "delCharAfter", "Backspace": "delCharBefore", "Tab": "defaultTab", "Shift-Tab": "indentAuto",
-    "Enter": "newlineAndIndent", "Insert": "toggleOverwrite"
-  };
-  // Note that the save and find-related commands aren't defined by
-  // default. Unknown commands are simply ignored.
-  keyMap.pcDefault = {
-    "Ctrl-A": "selectAll", "Ctrl-D": "deleteLine", "Ctrl-Z": "undo", "Shift-Ctrl-Z": "redo", "Ctrl-Y": "redo",
-    "Ctrl-Home": "goDocStart", "Alt-Up": "goDocStart", "Ctrl-End": "goDocEnd", "Ctrl-Down": "goDocEnd",
-    "Ctrl-Left": "goGroupLeft", "Ctrl-Right": "goGroupRight", "Alt-Left": "goLineStart", "Alt-Right": "goLineEnd",
-    "Ctrl-Backspace": "delGroupBefore", "Ctrl-Delete": "delGroupAfter", "Ctrl-S": "save", "Ctrl-F": "find",
-    "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",
-    "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",
-    fallthrough: "basic"
-  };
-  keyMap.macDefault = {
-    "Cmd-A": "selectAll", "Cmd-D": "deleteLine", "Cmd-Z": "undo", "Shift-Cmd-Z": "redo", "Cmd-Y": "redo",
-    "Cmd-Up": "goDocStart", "Cmd-End": "goDocEnd", "Cmd-Down": "goDocEnd", "Alt-Left": "goGroupLeft",
-    "Alt-Right": "goGroupRight", "Cmd-Left": "goLineStart", "Cmd-Right": "goLineEnd", "Alt-Backspace": "delGroupBefore",
-    "Ctrl-Alt-Backspace": "delGroupAfter", "Alt-Delete": "delGroupAfter", "Cmd-S": "save", "Cmd-F": "find",
-    "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",
-    "Cmd-[": "indentLess", "Cmd-]": "indentMore", "Cmd-Backspace": "delLineLeft",
-    fallthrough: ["basic", "emacsy"]
-  };
-  keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;
-  keyMap.emacsy = {
-    "Ctrl-F": "goCharRight", "Ctrl-B": "goCharLeft", "Ctrl-P": "goLineUp", "Ctrl-N": "goLineDown",
-    "Alt-F": "goWordRight", "Alt-B": "goWordLeft", "Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd",
-    "Ctrl-V": "goPageDown", "Shift-Ctrl-V": "goPageUp", "Ctrl-D": "delCharAfter", "Ctrl-H": "delCharBefore",
-    "Alt-D": "delWordAfter", "Alt-Backspace": "delWordBefore", "Ctrl-K": "killLine", "Ctrl-T": "transposeChars"
-  };
-
-  // KEYMAP DISPATCH
-
-  function getKeyMap(val) {
-    if (typeof val == "string") return keyMap[val];
-    else return val;
+    return true
   }
 
-  function lookupKey(name, maps, handle) {
-    function lookup(map) {
-      map = getKeyMap(map);
-      var found = map[name];
-      if (found === false) return "stop";
-      if (found != null && handle(found)) return true;
-      if (map.nofallthrough) return "stop";
-
-      var fallthrough = map.fallthrough;
-      if (fallthrough == null) return false;
-      if (Object.prototype.toString.call(fallthrough) != "[object Array]")
-        return lookup(fallthrough);
-      for (var i = 0, e = fallthrough.length; i < e; ++i) {
-        var done = lookup(fallthrough[i]);
-        if (done) return done;
+  if (unit == "char") {
+    moveOnce()
+  } else if (unit == "column") {
+    moveOnce(true)
+  } else if (unit == "word" || unit == "group") {
+    var sawType = null, group = unit == "group"
+    var helper = doc.cm && doc.cm.getHelper(pos, "wordChars")
+    for (var first = true;; first = false) {
+      if (dir < 0 && !moveOnce(!first)) { break }
+      var cur = lineObj.text.charAt(pos.ch) || "\n"
+      var type = isWordChar(cur, helper) ? "w"
+        : group && cur == "\n" ? "n"
+        : !group || /\s/.test(cur) ? null
+        : "p"
+      if (group && !first && !type) { type = "s" }
+      if (sawType && sawType != type) {
+        if (dir < 0) {dir = 1; moveOnce(); pos.sticky = "after"}
+        break
       }
-      return false;
-    }
 
-    for (var i = 0; i < maps.length; ++i) {
-      var done = lookup(maps[i]);
-      if (done) return done != "stop";
+      if (type) { sawType = type }
+      if (dir > 0 && !moveOnce(!first)) { break }
     }
   }
-  function isModifierKey(event) {
-    var name = keyNames[event.keyCode];
-    return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod";
-  }
-  function keyName(event, noShift) {
-    if (opera && event.keyCode == 34 && event["char"]) return false;
-    var name = keyNames[event.keyCode];
-    if (name == null || event.altGraphKey) return false;
-    if (event.altKey) name = "Alt-" + name;
-    if (flipCtrlCmd ? event.metaKey : event.ctrlKey) name = "Ctrl-" + name;
-    if (flipCtrlCmd ? event.ctrlKey : event.metaKey) name = "Cmd-" + name;
-    if (!noShift && event.shiftKey) name = "Shift-" + name;
-    return name;
-  }
-  CodeMirror.lookupKey = lookupKey;
-  CodeMirror.isModifierKey = isModifierKey;
-  CodeMirror.keyName = keyName;
+  var result = skipAtomic(doc, pos, oldPos, origDir, true)
+  if (equalCursorPos(oldPos, result)) { result.hitSide = true }
+  return result
+}
 
-  // FROMTEXTAREA
+// For relative vertical movement. Dir may be -1 or 1. Unit can be
+// "page" or "line". The resulting position will have a hitSide=true
+// property if it reached the end of the document.
+function findPosV(cm, pos, dir, unit) {
+  var doc = cm.doc, x = pos.left, y
+  if (unit == "page") {
+    var pageSize = Math.min(cm.display.wrapper.clientHeight, window.innerHeight || document.documentElement.clientHeight)
+    var moveAmount = Math.max(pageSize - .5 * textHeight(cm.display), 3)
+    y = (dir > 0 ? pos.bottom : pos.top) + dir * moveAmount
 
-  CodeMirror.fromTextArea = function(textarea, options) {
-    if (!options) options = {};
-    options.value = textarea.value;
-    if (!options.tabindex && textarea.tabindex)
-      options.tabindex = textarea.tabindex;
-    if (!options.placeholder && textarea.placeholder)
-      options.placeholder = textarea.placeholder;
-    // Set autofocus to true if this textarea is focused, or if it has
-    // autofocus and no other element is focused.
-    if (options.autofocus == null) {
-      var hasFocus = document.body;
-      // doc.activeElement occasionally throws on IE
-      try { hasFocus = document.activeElement; } catch(e) {}
-      options.autofocus = hasFocus == textarea ||
-        textarea.getAttribute("autofocus") != null && hasFocus == document.body;
+  } else if (unit == "line") {
+    y = dir > 0 ? pos.bottom + 3 : pos.top - 3
+  }
+  var target
+  for (;;) {
+    target = coordsChar(cm, x, y)
+    if (!target.outside) { break }
+    if (dir < 0 ? y <= 0 : y >= doc.height) { target.hitSide = true; break }
+    y += dir * 5
+  }
+  return target
+}
+
+// CONTENTEDITABLE INPUT STYLE
+
+var ContentEditableInput = function(cm) {
+  this.cm = cm
+  this.lastAnchorNode = this.lastAnchorOffset = this.lastFocusNode = this.lastFocusOffset = null
+  this.polling = new Delayed()
+  this.composing = null
+  this.gracePeriod = false
+  this.readDOMTimeout = null
+};
+
+ContentEditableInput.prototype.init = function (display) {
+    var this$1 = this;
+
+  var input = this, cm = input.cm
+  var div = input.div = display.lineDiv
+  disableBrowserMagic(div, cm.options.spellcheck)
+
+  on(div, "paste", function (e) {
+    if (signalDOMEvent(cm, e) || handlePaste(e, cm)) { return }
+    // IE doesn't fire input events, so we schedule a read for the pasted content in this way
+    if (ie_version <= 11) { setTimeout(operation(cm, function () { return this$1.updateFromDOM(); }), 20) }
+  })
+
+  on(div, "compositionstart", function (e) {
+    this$1.composing = {data: e.data, done: false}
+  })
+  on(div, "compositionupdate", function (e) {
+    if (!this$1.composing) { this$1.composing = {data: e.data, done: false} }
+  })
+  on(div, "compositionend", function (e) {
+    if (this$1.composing) {
+      if (e.data != this$1.composing.data) { this$1.readFromDOMSoon() }
+      this$1.composing.done = true
     }
+  })
 
-    function save() {textarea.value = cm.getValue();}
-    if (textarea.form) {
-      on(textarea.form, "submit", save);
-      // Deplorable hack to make the submit method do the right thing.
-      if (!options.leaveSubmitMethodAlone) {
-        var form = textarea.form, realSubmit = form.submit;
-        try {
-          var wrappedSubmit = form.submit = function() {
-            save();
-            form.submit = realSubmit;
-            form.submit();
-            form.submit = wrappedSubmit;
-          };
-        } catch(e) {}
+  on(div, "touchstart", function () { return input.forceCompositionEnd(); })
+
+  on(div, "input", function () {
+    if (!this$1.composing) { this$1.readFromDOMSoon() }
+  })
+
+  function onCopyCut(e) {
+    if (signalDOMEvent(cm, e)) { return }
+    if (cm.somethingSelected()) {
+      setLastCopied({lineWise: false, text: cm.getSelections()})
+      if (e.type == "cut") { cm.replaceSelection("", null, "cut") }
+    } else if (!cm.options.lineWiseCopyCut) {
+      return
+    } else {
+      var ranges = copyableRanges(cm)
+      setLastCopied({lineWise: true, text: ranges.text})
+      if (e.type == "cut") {
+        cm.operation(function () {
+          cm.setSelections(ranges.ranges, 0, sel_dontScroll)
+          cm.replaceSelection("", null, "cut")
+        })
       }
     }
+    if (e.clipboardData) {
+      e.clipboardData.clearData()
+      var content = lastCopied.text.join("\n")
+      // iOS exposes the clipboard API, but seems to discard content inserted into it
+      e.clipboardData.setData("Text", content)
+      if (e.clipboardData.getData("Text") == content) {
+        e.preventDefault()
+        return
+      }
+    }
+    // Old-fashioned briefly-focus-a-textarea hack
+    var kludge = hiddenTextarea(), te = kludge.firstChild
+    cm.display.lineSpace.insertBefore(kludge, cm.display.lineSpace.firstChild)
+    te.value = lastCopied.text.join("\n")
+    var hadFocus = document.activeElement
+    selectInput(te)
+    setTimeout(function () {
+      cm.display.lineSpace.removeChild(kludge)
+      hadFocus.focus()
+      if (hadFocus == div) { input.showPrimarySelection() }
+    }, 50)
+  }
+  on(div, "copy", onCopyCut)
+  on(div, "cut", onCopyCut)
+};
 
-    textarea.style.display = "none";
-    var cm = CodeMirror(function(node) {
-      textarea.parentNode.insertBefore(node, textarea.nextSibling);
-    }, options);
-    cm.save = save;
-    cm.getTextArea = function() { return textarea; };
-    cm.toTextArea = function() {
-      save();
-      textarea.parentNode.removeChild(cm.getWrapperElement());
-      textarea.style.display = "";
+ContentEditableInput.prototype.prepareSelection = function () {
+  var result = prepareSelection(this.cm, false)
+  result.focus = this.cm.state.focused
+  return result
+};
+
+ContentEditableInput.prototype.showSelection = function (info, takeFocus) {
+  if (!info || !this.cm.display.view.length) { return }
+  if (info.focus || takeFocus) { this.showPrimarySelection() }
+  this.showMultipleSelections(info)
+};
+
+ContentEditableInput.prototype.showPrimarySelection = function () {
+  var sel = window.getSelection(), cm = this.cm, prim = cm.doc.sel.primary()
+  var from = prim.from(), to = prim.to()
+
+  if (cm.display.viewTo == cm.display.viewFrom || from.line >= cm.display.viewTo || to.line < cm.display.viewFrom) {
+    sel.removeAllRanges()
+    return
+  }
+
+  var curAnchor = domToPos(cm, sel.anchorNode, sel.anchorOffset)
+  var curFocus = domToPos(cm, sel.focusNode, sel.focusOffset)
+  if (curAnchor && !curAnchor.bad && curFocus && !curFocus.bad &&
+      cmp(minPos(curAnchor, curFocus), from) == 0 &&
+      cmp(maxPos(curAnchor, curFocus), to) == 0)
+    { return }
+
+  var view = cm.display.view
+  var start = (from.line >= cm.display.viewFrom && posToDOM(cm, from)) ||
+      {node: view[0].measure.map[2], offset: 0}
+  var end = to.line < cm.display.viewTo && posToDOM(cm, to)
+  if (!end) {
+    var measure = view[view.length - 1].measure
+    var map = measure.maps ? measure.maps[measure.maps.length - 1] : measure.map
+    end = {node: map[map.length - 1], offset: map[map.length - 2] - map[map.length - 3]}
+  }
+
+  if (!start || !end) {
+    sel.removeAllRanges()
+    return
+  }
+
+  var old = sel.rangeCount && sel.getRangeAt(0), rng
+  try { rng = range(start.node, start.offset, end.offset, end.node) }
+  catch(e) {} // Our model of the DOM might be outdated, in which case the range we try to set can be impossible
+  if (rng) {
+    if (!gecko && cm.state.focused) {
+      sel.collapse(start.node, start.offset)
+      if (!rng.collapsed) {
+        sel.removeAllRanges()
+        sel.addRange(rng)
+      }
+    } else {
+      sel.removeAllRanges()
+      sel.addRange(rng)
+    }
+    if (old && sel.anchorNode == null) { sel.addRange(old) }
+    else if (gecko) { this.startGracePeriod() }
+  }
+  this.rememberSelection()
+};
+
+ContentEditableInput.prototype.startGracePeriod = function () {
+    var this$1 = this;
+
+  clearTimeout(this.gracePeriod)
+  this.gracePeriod = setTimeout(function () {
+    this$1.gracePeriod = false
+    if (this$1.selectionChanged())
+      { this$1.cm.operation(function () { return this$1.cm.curOp.selectionChanged = true; }) }
+  }, 20)
+};
+
+ContentEditableInput.prototype.showMultipleSelections = function (info) {
+  removeChildrenAndAdd(this.cm.display.cursorDiv, info.cursors)
+  removeChildrenAndAdd(this.cm.display.selectionDiv, info.selection)
+};
+
+ContentEditableInput.prototype.rememberSelection = function () {
+  var sel = window.getSelection()
+  this.lastAnchorNode = sel.anchorNode; this.lastAnchorOffset = sel.anchorOffset
+  this.lastFocusNode = sel.focusNode; this.lastFocusOffset = sel.focusOffset
+};
+
+ContentEditableInput.prototype.selectionInEditor = function () {
+  var sel = window.getSelection()
+  if (!sel.rangeCount) { return false }
+  var node = sel.getRangeAt(0).commonAncestorContainer
+  return contains(this.div, node)
+};
+
+ContentEditableInput.prototype.focus = function () {
+  if (this.cm.options.readOnly != "nocursor") {
+    if (!this.selectionInEditor())
+      { this.showSelection(this.prepareSelection(), true) }
+    this.div.focus()
+  }
+};
+ContentEditableInput.prototype.blur = function () { this.div.blur() };
+ContentEditableInput.prototype.getField = function () { return this.div };
+
+ContentEditableInput.prototype.supportsTouch = function () { return true };
+
+ContentEditableInput.prototype.receivedFocus = function () {
+  var input = this
+  if (this.selectionInEditor())
+    { this.pollSelection() }
+  else
+    { runInOp(this.cm, function () { return input.cm.curOp.selectionChanged = true; }) }
+
+  function poll() {
+    if (input.cm.state.focused) {
+      input.pollSelection()
+      input.polling.set(input.cm.options.pollInterval, poll)
+    }
+  }
+  this.polling.set(this.cm.options.pollInterval, poll)
+};
+
+ContentEditableInput.prototype.selectionChanged = function () {
+  var sel = window.getSelection()
+  return sel.anchorNode != this.lastAnchorNode || sel.anchorOffset != this.lastAnchorOffset ||
+    sel.focusNode != this.lastFocusNode || sel.focusOffset != this.lastFocusOffset
+};
+
+ContentEditableInput.prototype.pollSelection = function () {
+  if (this.readDOMTimeout != null || this.gracePeriod || !this.selectionChanged()) { return }
+  var sel = window.getSelection(), cm = this.cm
+  // On Android Chrome (version 56, at least), backspacing into an
+  // uneditable block element will put the cursor in that element,
+  // and then, because it's not editable, hide the virtual keyboard.
+  // Because Android doesn't allow us to actually detect backspace
+  // presses in a sane way, this code checks for when that happens
+  // and simulates a backspace press in this case.
+  if (android && chrome && this.cm.options.gutters.length && isInGutter(sel.anchorNode)) {
+    this.cm.triggerOnKeyDown({type: "keydown", keyCode: 8, preventDefault: Math.abs})
+    this.blur()
+    this.focus()
+    return
+  }
+  if (this.composing) { return }
+  this.rememberSelection()
+  var anchor = domToPos(cm, sel.anchorNode, sel.anchorOffset)
+  var head = domToPos(cm, sel.focusNode, sel.focusOffset)
+  if (anchor && head) { runInOp(cm, function () {
+    setSelection(cm.doc, simpleSelection(anchor, head), sel_dontScroll)
+    if (anchor.bad || head.bad) { cm.curOp.selectionChanged = true }
+  }) }
+};
+
+ContentEditableInput.prototype.pollContent = function () {
+  if (this.readDOMTimeout != null) {
+    clearTimeout(this.readDOMTimeout)
+    this.readDOMTimeout = null
+  }
+
+  var cm = this.cm, display = cm.display, sel = cm.doc.sel.primary()
+  var from = sel.from(), to = sel.to()
+  if (from.ch == 0 && from.line > cm.firstLine())
+    { from = Pos(from.line - 1, getLine(cm.doc, from.line - 1).length) }
+  if (to.ch == getLine(cm.doc, to.line).text.length && to.line < cm.lastLine())
+    { to = Pos(to.line + 1, 0) }
+  if (from.line < display.viewFrom || to.line > display.viewTo - 1) { return false }
+
+  var fromIndex, fromLine, fromNode
+  if (from.line == display.viewFrom || (fromIndex = findViewIndex(cm, from.line)) == 0) {
+    fromLine = lineNo(display.view[0].line)
+    fromNode = display.view[0].node
+  } else {
+    fromLine = lineNo(display.view[fromIndex].line)
+    fromNode = display.view[fromIndex - 1].node.nextSibling
+  }
+  var toIndex = findViewIndex(cm, to.line)
+  var toLine, toNode
+  if (toIndex == display.view.length - 1) {
+    toLine = display.viewTo - 1
+    toNode = display.lineDiv.lastChild
+  } else {
+    toLine = lineNo(display.view[toIndex + 1].line) - 1
+    toNode = display.view[toIndex + 1].node.previousSibling
+  }
+
+  if (!fromNode) { return false }
+  var newText = cm.doc.splitLines(domTextBetween(cm, fromNode, toNode, fromLine, toLine))
+  var oldText = getBetween(cm.doc, Pos(fromLine, 0), Pos(toLine, getLine(cm.doc, toLine).text.length))
+  while (newText.length > 1 && oldText.length > 1) {
+    if (lst(newText) == lst(oldText)) { newText.pop(); oldText.pop(); toLine-- }
+    else if (newText[0] == oldText[0]) { newText.shift(); oldText.shift(); fromLine++ }
+    else { break }
+  }
+
+  var cutFront = 0, cutEnd = 0
+  var newTop = newText[0], oldTop = oldText[0], maxCutFront = Math.min(newTop.length, oldTop.length)
+  while (cutFront < maxCutFront && newTop.charCodeAt(cutFront) == oldTop.charCodeAt(cutFront))
+    { ++cutFront }
+  var newBot = lst(newText), oldBot = lst(oldText)
+  var maxCutEnd = Math.min(newBot.length - (newText.length == 1 ? cutFront : 0),
+                           oldBot.length - (oldText.length == 1 ? cutFront : 0))
+  while (cutEnd < maxCutEnd &&
+         newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1))
+    { ++cutEnd }
+  // Try to move start of change to start of selection if ambiguous
+  if (newText.length == 1 && oldText.length == 1 && fromLine == from.line) {
+    while (cutFront && cutFront > from.ch &&
+           newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1)) {
+      cutFront--
+      cutEnd++
+    }
+  }
+
+  newText[newText.length - 1] = newBot.slice(0, newBot.length - cutEnd).replace(/^\u200b+/, "")
+  newText[0] = newText[0].slice(cutFront).replace(/\u200b+$/, "")
+
+  var chFrom = Pos(fromLine, cutFront)
+  var chTo = Pos(toLine, oldText.length ? lst(oldText).length - cutEnd : 0)
+  if (newText.length > 1 || newText[0] || cmp(chFrom, chTo)) {
+    replaceRange(cm.doc, newText, chFrom, chTo, "+input")
+    return true
+  }
+};
+
+ContentEditableInput.prototype.ensurePolled = function () {
+  this.forceCompositionEnd()
+};
+ContentEditableInput.prototype.reset = function () {
+  this.forceCompositionEnd()
+};
+ContentEditableInput.prototype.forceCompositionEnd = function () {
+  if (!this.composing) { return }
+  clearTimeout(this.readDOMTimeout)
+  this.composing = null
+  this.updateFromDOM()
+  this.div.blur()
+  this.div.focus()
+};
+ContentEditableInput.prototype.readFromDOMSoon = function () {
+    var this$1 = this;
+
+  if (this.readDOMTimeout != null) { return }
+  this.readDOMTimeout = setTimeout(function () {
+    this$1.readDOMTimeout = null
+    if (this$1.composing) {
+      if (this$1.composing.done) { this$1.composing = null }
+      else { return }
+    }
+    this$1.updateFromDOM()
+  }, 80)
+};
+
+ContentEditableInput.prototype.updateFromDOM = function () {
+    var this$1 = this;
+
+  if (this.cm.isReadOnly() || !this.pollContent())
+    { runInOp(this.cm, function () { return regChange(this$1.cm); }) }
+};
+
+ContentEditableInput.prototype.setUneditable = function (node) {
+  node.contentEditable = "false"
+};
+
+ContentEditableInput.prototype.onKeyPress = function (e) {
+  if (e.charCode == 0) { return }
+  e.preventDefault()
+  if (!this.cm.isReadOnly())
+    { operation(this.cm, applyTextInput)(this.cm, String.fromCharCode(e.charCode == null ? e.keyCode : e.charCode), 0) }
+};
+
+ContentEditableInput.prototype.readOnlyChanged = function (val) {
+  this.div.contentEditable = String(val != "nocursor")
+};
+
+ContentEditableInput.prototype.onContextMenu = function () {};
+ContentEditableInput.prototype.resetPosition = function () {};
+
+ContentEditableInput.prototype.needsContentAttribute = true
+
+function posToDOM(cm, pos) {
+  var view = findViewForLine(cm, pos.line)
+  if (!view || view.hidden) { return null }
+  var line = getLine(cm.doc, pos.line)
+  var info = mapFromLineView(view, line, pos.line)
+
+  var order = getOrder(line, cm.doc.direction), side = "left"
+  if (order) {
+    var partPos = getBidiPartAt(order, pos.ch)
+    side = partPos % 2 ? "right" : "left"
+  }
+  var result = nodeAndOffsetInLineMap(info.map, pos.ch, side)
+  result.offset = result.collapse == "right" ? result.end : result.start
+  return result
+}
+
+function isInGutter(node) {
+  for (var scan = node; scan; scan = scan.parentNode)
+    { if (/CodeMirror-gutter-wrapper/.test(scan.className)) { return true } }
+  return false
+}
+
+function badPos(pos, bad) { if (bad) { pos.bad = true; } return pos }
+
+function domTextBetween(cm, from, to, fromLine, toLine) {
+  var text = "", closing = false, lineSep = cm.doc.lineSeparator()
+  function recognizeMarker(id) { return function (marker) { return marker.id == id; } }
+  function close() {
+    if (closing) {
+      text += lineSep
+      closing = false
+    }
+  }
+  function addText(str) {
+    if (str) {
+      close()
+      text += str
+    }
+  }
+  function walk(node) {
+    if (node.nodeType == 1) {
+      var cmText = node.getAttribute("cm-text")
+      if (cmText != null) {
+        addText(cmText || node.textContent.replace(/\u200b/g, ""))
+        return
+      }
+      var markerID = node.getAttribute("cm-marker"), range
+      if (markerID) {
+        var found = cm.findMarks(Pos(fromLine, 0), Pos(toLine + 1, 0), recognizeMarker(+markerID))
+        if (found.length && (range = found[0].find()))
+          { addText(getBetween(cm.doc, range.from, range.to).join(lineSep)) }
+        return
+      }
+      if (node.getAttribute("contenteditable") == "false") { return }
+      var isBlock = /^(pre|div|p)$/i.test(node.nodeName)
+      if (isBlock) { close() }
+      for (var i = 0; i < node.childNodes.length; i++)
+        { walk(node.childNodes[i]) }
+      if (isBlock) { closing = true }
+    } else if (node.nodeType == 3) {
+      addText(node.nodeValue)
+    }
+  }
+  for (;;) {
+    walk(from)
+    if (from == to) { break }
+    from = from.nextSibling
+  }
+  return text
+}
+
+function domToPos(cm, node, offset) {
+  var lineNode
+  if (node == cm.display.lineDiv) {
+    lineNode = cm.display.lineDiv.childNodes[offset]
+    if (!lineNode) { return badPos(cm.clipPos(Pos(cm.display.viewTo - 1)), true) }
+    node = null; offset = 0
+  } else {
+    for (lineNode = node;; lineNode = lineNode.parentNode) {
+      if (!lineNode || lineNode == cm.display.lineDiv) { return null }
+      if (lineNode.parentNode && lineNode.parentNode == cm.display.lineDiv) { break }
+    }
+  }
+  for (var i = 0; i < cm.display.view.length; i++) {
+    var lineView = cm.display.view[i]
+    if (lineView.node == lineNode)
+      { return locateNodeInLineView(lineView, node, offset) }
+  }
+}
+
+function locateNodeInLineView(lineView, node, offset) {
+  var wrapper = lineView.text.firstChild, bad = false
+  if (!node || !contains(wrapper, node)) { return badPos(Pos(lineNo(lineView.line), 0), true) }
+  if (node == wrapper) {
+    bad = true
+    node = wrapper.childNodes[offset]
+    offset = 0
+    if (!node) {
+      var line = lineView.rest ? lst(lineView.rest) : lineView.line
+      return badPos(Pos(lineNo(line), line.text.length), bad)
+    }
+  }
+
+  var textNode = node.nodeType == 3 ? node : null, topNode = node
+  if (!textNode && node.childNodes.length == 1 && node.firstChild.nodeType == 3) {
+    textNode = node.firstChild
+    if (offset) { offset = textNode.nodeValue.length }
+  }
+  while (topNode.parentNode != wrapper) { topNode = topNode.parentNode }
+  var measure = lineView.measure, maps = measure.maps
+
+  function find(textNode, topNode, offset) {
+    for (var i = -1; i < (maps ? maps.length : 0); i++) {
+      var map = i < 0 ? measure.map : maps[i]
+      for (var j = 0; j < map.length; j += 3) {
+        var curNode = map[j + 2]
+        if (curNode == textNode || curNode == topNode) {
+          var line = lineNo(i < 0 ? lineView.line : lineView.rest[i])
+          var ch = map[j] + offset
+          if (offset < 0 || curNode != textNode) { ch = map[j + (offset ? 1 : 0)] }
+          return Pos(line, ch)
+        }
+      }
+    }
+  }
+  var found = find(textNode, topNode, offset)
+  if (found) { return badPos(found, bad) }
+
+  // FIXME this is all really shaky. might handle the few cases it needs to handle, but likely to cause problems
+  for (var after = topNode.nextSibling, dist = textNode ? textNode.nodeValue.length - offset : 0; after; after = after.nextSibling) {
+    found = find(after, after.firstChild, 0)
+    if (found)
+      { return badPos(Pos(found.line, found.ch - dist), bad) }
+    else
+      { dist += after.textContent.length }
+  }
+  for (var before = topNode.previousSibling, dist$1 = offset; before; before = before.previousSibling) {
+    found = find(before, before.firstChild, -1)
+    if (found)
+      { return badPos(Pos(found.line, found.ch + dist$1), bad) }
+    else
+      { dist$1 += before.textContent.length }
+  }
+}
+
+// TEXTAREA INPUT STYLE
+
+var TextareaInput = function(cm) {
+  this.cm = cm
+  // See input.poll and input.reset
+  this.prevInput = ""
+
+  // Flag that indicates whether we expect input to appear real soon
+  // now (after some event like 'keypress' or 'input') and are
+  // polling intensively.
+  this.pollingFast = false
+  // Self-resetting timeout for the poller
+  this.polling = new Delayed()
+  // Tracks when input.reset has punted to just putting a short
+  // string into the textarea instead of the full selection.
+  this.inaccurateSelection = false
+  // Used to work around IE issue with selection being forgotten when focus moves away from textarea
+  this.hasSelection = false
+  this.composing = null
+};
+
+TextareaInput.prototype.init = function (display) {
+    var this$1 = this;
+
+  var input = this, cm = this.cm
+
+  // Wraps and hides input textarea
+  var div = this.wrapper = hiddenTextarea()
+  // The semihidden textarea that is focused when the editor is
+  // focused, and receives input.
+  var te = this.textarea = div.firstChild
+  display.wrapper.insertBefore(div, display.wrapper.firstChild)
+
+  // Needed to hide big blue blinking cursor on Mobile Safari (doesn't seem to work in iOS 8 anymore)
+  if (ios) { te.style.width = "0px" }
+
+  on(te, "input", function () {
+    if (ie && ie_version >= 9 && this$1.hasSelection) { this$1.hasSelection = null }
+    input.poll()
+  })
+
+  on(te, "paste", function (e) {
+    if (signalDOMEvent(cm, e) || handlePaste(e, cm)) { return }
+
+    cm.state.pasteIncoming = true
+    input.fastPoll()
+  })
+
+  function prepareCopyCut(e) {
+    if (signalDOMEvent(cm, e)) { return }
+    if (cm.somethingSelected()) {
+      setLastCopied({lineWise: false, text: cm.getSelections()})
+      if (input.inaccurateSelection) {
+        input.prevInput = ""
+        input.inaccurateSelection = false
+        te.value = lastCopied.text.join("\n")
+        selectInput(te)
+      }
+    } else if (!cm.options.lineWiseCopyCut) {
+      return
+    } else {
+      var ranges = copyableRanges(cm)
+      setLastCopied({lineWise: true, text: ranges.text})
+      if (e.type == "cut") {
+        cm.setSelections(ranges.ranges, null, sel_dontScroll)
+      } else {
+        input.prevInput = ""
+        te.value = ranges.text.join("\n")
+        selectInput(te)
+      }
+    }
+    if (e.type == "cut") { cm.state.cutIncoming = true }
+  }
+  on(te, "cut", prepareCopyCut)
+  on(te, "copy", prepareCopyCut)
+
+  on(display.scroller, "paste", function (e) {
+    if (eventInWidget(display, e) || signalDOMEvent(cm, e)) { return }
+    cm.state.pasteIncoming = true
+    input.focus()
+  })
+
+  // Prevent normal selection in the editor (we handle our own)
+  on(display.lineSpace, "selectstart", function (e) {
+    if (!eventInWidget(display, e)) { e_preventDefault(e) }
+  })
+
+  on(te, "compositionstart", function () {
+    var start = cm.getCursor("from")
+    if (input.composing) { input.composing.range.clear() }
+    input.composing = {
+      start: start,
+      range: cm.markText(start, cm.getCursor("to"), {className: "CodeMirror-composing"})
+    }
+  })
+  on(te, "compositionend", function () {
+    if (input.composing) {
+      input.poll()
+      input.composing.range.clear()
+      input.composing = null
+    }
+  })
+};
+
+TextareaInput.prototype.prepareSelection = function () {
+  // Redraw the selection and/or cursor
+  var cm = this.cm, display = cm.display, doc = cm.doc
+  var result = prepareSelection(cm)
+
+  // Move the hidden textarea near the cursor to prevent scrolling artifacts
+  if (cm.options.moveInputWithCursor) {
+    var headPos = cursorCoords(cm, doc.sel.primary().head, "div")
+    var wrapOff = display.wrapper.getBoundingClientRect(), lineOff = display.lineDiv.getBoundingClientRect()
+    result.teTop = Math.max(0, Math.min(display.wrapper.clientHeight - 10,
+                                        headPos.top + lineOff.top - wrapOff.top))
+    result.teLeft = Math.max(0, Math.min(display.wrapper.clientWidth - 10,
+                                         headPos.left + lineOff.left - wrapOff.left))
+  }
+
+  return result
+};
+
+TextareaInput.prototype.showSelection = function (drawn) {
+  var cm = this.cm, display = cm.display
+  removeChildrenAndAdd(display.cursorDiv, drawn.cursors)
+  removeChildrenAndAdd(display.selectionDiv, drawn.selection)
+  if (drawn.teTop != null) {
+    this.wrapper.style.top = drawn.teTop + "px"
+    this.wrapper.style.left = drawn.teLeft + "px"
+  }
+};
+
+// Reset the input to correspond to the selection (or to be empty,
+// when not typing and nothing is selected)
+TextareaInput.prototype.reset = function (typing) {
+  if (this.contextMenuPending) { return }
+  var minimal, selected, cm = this.cm, doc = cm.doc
+  if (cm.somethingSelected()) {
+    this.prevInput = ""
+    var range = doc.sel.primary()
+    minimal = hasCopyEvent &&
+      (range.to().line - range.from().line > 100 || (selected = cm.getSelection()).length > 1000)
+    var content = minimal ? "-" : selected || cm.getSelection()
+    this.textarea.value = content
+    if (cm.state.focused) { selectInput(this.textarea) }
+    if (ie && ie_version >= 9) { this.hasSelection = content }
+  } else if (!typing) {
+    this.prevInput = this.textarea.value = ""
+    if (ie && ie_version >= 9) { this.hasSelection = null }
+  }
+  this.inaccurateSelection = minimal
+};
+
+TextareaInput.prototype.getField = function () { return this.textarea };
+
+TextareaInput.prototype.supportsTouch = function () { return false };
+
+TextareaInput.prototype.focus = function () {
+  if (this.cm.options.readOnly != "nocursor" && (!mobile || activeElt() != this.textarea)) {
+    try { this.textarea.focus() }
+    catch (e) {} // IE8 will throw if the textarea is display: none or not in DOM
+  }
+};
+
+TextareaInput.prototype.blur = function () { this.textarea.blur() };
+
+TextareaInput.prototype.resetPosition = function () {
+  this.wrapper.style.top = this.wrapper.style.left = 0
+};
+
+TextareaInput.prototype.receivedFocus = function () { this.slowPoll() };
+
+// Poll for input changes, using the normal rate of polling. This
+// runs as long as the editor is focused.
+TextareaInput.prototype.slowPoll = function () {
+    var this$1 = this;
+
+  if (this.pollingFast) { return }
+  this.polling.set(this.cm.options.pollInterval, function () {
+    this$1.poll()
+    if (this$1.cm.state.focused) { this$1.slowPoll() }
+  })
+};
+
+// When an event has just come in that is likely to add or change
+// something in the input textarea, we poll faster, to ensure that
+// the change appears on the screen quickly.
+TextareaInput.prototype.fastPoll = function () {
+  var missed = false, input = this
+  input.pollingFast = true
+  function p() {
+    var changed = input.poll()
+    if (!changed && !missed) {missed = true; input.polling.set(60, p)}
+    else {input.pollingFast = false; input.slowPoll()}
+  }
+  input.polling.set(20, p)
+};
+
+// Read input from the textarea, and update the document to match.
+// When something is selected, it is present in the textarea, and
+// selected (unless it is huge, in which case a placeholder is
+// used). When nothing is selected, the cursor sits after previously
+// seen text (can be empty), which is stored in prevInput (we must
+// not reset the textarea when typing, because that breaks IME).
+TextareaInput.prototype.poll = function () {
+    var this$1 = this;
+
+  var cm = this.cm, input = this.textarea, prevInput = this.prevInput
+  // Since this is called a *lot*, try to bail out as cheaply as
+  // possible when it is clear that nothing happened. hasSelection
+  // will be the case when there is a lot of text in the textarea,
+  // in which case reading its value would be expensive.
+  if (this.contextMenuPending || !cm.state.focused ||
+      (hasSelection(input) && !prevInput && !this.composing) ||
+      cm.isReadOnly() || cm.options.disableInput || cm.state.keySeq)
+    { return false }
+
+  var text = input.value
+  // If nothing changed, bail.
+  if (text == prevInput && !cm.somethingSelected()) { return false }
+  // Work around nonsensical selection resetting in IE9/10, and
+  // inexplicable appearance of private area unicode characters on
+  // some key combos in Mac (#2689).
+  if (ie && ie_version >= 9 && this.hasSelection === text ||
+      mac && /[\uf700-\uf7ff]/.test(text)) {
+    cm.display.input.reset()
+    return false
+  }
+
+  if (cm.doc.sel == cm.display.selForContextMenu) {
+    var first = text.charCodeAt(0)
+    if (first == 0x200b && !prevInput) { prevInput = "\u200b" }
+    if (first == 0x21da) { this.reset(); return this.cm.execCommand("undo") }
+  }
+  // Find the part of the input that is actually new
+  var same = 0, l = Math.min(prevInput.length, text.length)
+  while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) { ++same }
+
+  runInOp(cm, function () {
+    applyTextInput(cm, text.slice(same), prevInput.length - same,
+                   null, this$1.composing ? "*compose" : null)
+
+    // Don't leave long text in the textarea, since it makes further polling slow
+    if (text.length > 1000 || text.indexOf("\n") > -1) { input.value = this$1.prevInput = "" }
+    else { this$1.prevInput = text }
+
+    if (this$1.composing) {
+      this$1.composing.range.clear()
+      this$1.composing.range = cm.markText(this$1.composing.start, cm.getCursor("to"),
+                                         {className: "CodeMirror-composing"})
+    }
+  })
+  return true
+};
+
+TextareaInput.prototype.ensurePolled = function () {
+  if (this.pollingFast && this.poll()) { this.pollingFast = false }
+};
+
+TextareaInput.prototype.onKeyPress = function () {
+  if (ie && ie_version >= 9) { this.hasSelection = null }
+  this.fastPoll()
+};
+
+TextareaInput.prototype.onContextMenu = function (e) {
+  var input = this, cm = input.cm, display = cm.display, te = input.textarea
+  var pos = posFromMouse(cm, e), scrollPos = display.scroller.scrollTop
+  if (!pos || presto) { return } // Opera is difficult.
+
+  // Reset the current text selection only if the click is done outside of the selection
+  // and 'resetSelectionOnContextMenu' option is true.
+  var reset = cm.options.resetSelectionOnContextMenu
+  if (reset && cm.doc.sel.contains(pos) == -1)
+    { operation(cm, setSelection)(cm.doc, simpleSelection(pos), sel_dontScroll) }
+
+  var oldCSS = te.style.cssText, oldWrapperCSS = input.wrapper.style.cssText
+  input.wrapper.style.cssText = "position: absolute"
+  var wrapperBox = input.wrapper.getBoundingClientRect()
+  te.style.cssText = "position: absolute; width: 30px; height: 30px;\n      top: " + (e.clientY - wrapperBox.top - 5) + "px; left: " + (e.clientX - wrapperBox.left - 5) + "px;\n      z-index: 1000; background: " + (ie ? "rgba(255, 255, 255, .05)" : "transparent") + ";\n      outline: none; border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);"
+  var oldScrollY
+  if (webkit) { oldScrollY = window.scrollY } // Work around Chrome issue (#2712)
+  display.input.focus()
+  if (webkit) { window.scrollTo(null, oldScrollY) }
+  display.input.reset()
+  // Adds "Select all" to context menu in FF
+  if (!cm.somethingSelected()) { te.value = input.prevInput = " " }
+  input.contextMenuPending = true
+  display.selForContextMenu = cm.doc.sel
+  clearTimeout(display.detectingSelectAll)
+
+  // Select-all will be greyed out if there's nothing to select, so
+  // this adds a zero-width space so that we can later check whether
+  // it got selected.
+  function prepareSelectAllHack() {
+    if (te.selectionStart != null) {
+      var selected = cm.somethingSelected()
+      var extval = "\u200b" + (selected ? te.value : "")
+      te.value = "\u21da" // Used to catch context-menu undo
+      te.value = extval
+      input.prevInput = selected ? "" : "\u200b"
+      te.selectionStart = 1; te.selectionEnd = extval.length
+      // Re-set this, in case some other handler touched the
+      // selection in the meantime.
+      display.selForContextMenu = cm.doc.sel
+    }
+  }
+  function rehide() {
+    input.contextMenuPending = false
+    input.wrapper.style.cssText = oldWrapperCSS
+    te.style.cssText = oldCSS
+    if (ie && ie_version < 9) { display.scrollbars.setScrollTop(display.scroller.scrollTop = scrollPos) }
+
+    // Try to detect the user choosing select-all
+    if (te.selectionStart != null) {
+      if (!ie || (ie && ie_version < 9)) { prepareSelectAllHack() }
+      var i = 0, poll = function () {
+        if (display.selForContextMenu == cm.doc.sel && te.selectionStart == 0 &&
+            te.selectionEnd > 0 && input.prevInput == "\u200b") {
+          operation(cm, selectAll)(cm)
+        } else if (i++ < 10) {
+          display.detectingSelectAll = setTimeout(poll, 500)
+        } else {
+          display.selForContextMenu = null
+          display.input.reset()
+        }
+      }
+      display.detectingSelectAll = setTimeout(poll, 200)
+    }
+  }
+
+  if (ie && ie_version >= 9) { prepareSelectAllHack() }
+  if (captureRightClick) {
+    e_stop(e)
+    var mouseup = function () {
+      off(window, "mouseup", mouseup)
+      setTimeout(rehide, 20)
+    }
+    on(window, "mouseup", mouseup)
+  } else {
+    setTimeout(rehide, 50)
+  }
+};
+
+TextareaInput.prototype.readOnlyChanged = function (val) {
+  if (!val) { this.reset() }
+};
+
+TextareaInput.prototype.setUneditable = function () {};
+
+TextareaInput.prototype.needsContentAttribute = false
+
+function fromTextArea(textarea, options) {
+  options = options ? copyObj(options) : {}
+  options.value = textarea.value
+  if (!options.tabindex && textarea.tabIndex)
+    { options.tabindex = textarea.tabIndex }
+  if (!options.placeholder && textarea.placeholder)
+    { options.placeholder = textarea.placeholder }
+  // Set autofocus to true if this textarea is focused, or if it has
+  // autofocus and no other element is focused.
+  if (options.autofocus == null) {
+    var hasFocus = activeElt()
+    options.autofocus = hasFocus == textarea ||
+      textarea.getAttribute("autofocus") != null && hasFocus == document.body
+  }
+
+  function save() {textarea.value = cm.getValue()}
+
+  var realSubmit
+  if (textarea.form) {
+    on(textarea.form, "submit", save)
+    // Deplorable hack to make the submit method do the right thing.
+    if (!options.leaveSubmitMethodAlone) {
+      var form = textarea.form
+      realSubmit = form.submit
+      try {
+        var wrappedSubmit = form.submit = function () {
+          save()
+          form.submit = realSubmit
+          form.submit()
+          form.submit = wrappedSubmit
+        }
+      } catch(e) {}
+    }
+  }
+
+  options.finishInit = function (cm) {
+    cm.save = save
+    cm.getTextArea = function () { return textarea; }
+    cm.toTextArea = function () {
+      cm.toTextArea = isNaN // Prevent this from being ran twice
+      save()
+      textarea.parentNode.removeChild(cm.getWrapperElement())
+      textarea.style.display = ""
       if (textarea.form) {
-        off(textarea.form, "submit", save);
+        off(textarea.form, "submit", save)
         if (typeof textarea.form.submit == "function")
-          textarea.form.submit = realSubmit;
-      }
-    };
-    return cm;
-  };
-
-  // STRING STREAM
-
-  // Fed to the mode parsers, provides helper functions to make
-  // parsers more succinct.
-
-  // The character stream used by a mode's parser.
-  function StringStream(string, tabSize) {
-    this.pos = this.start = 0;
-    this.string = string;
-    this.tabSize = tabSize || 8;
-    this.lastColumnPos = this.lastColumnValue = 0;
-  }
-
-  StringStream.prototype = {
-    eol: function() {return this.pos >= this.string.length;},
-    sol: function() {return this.pos == 0;},
-    peek: function() {return this.string.charAt(this.pos) || undefined;},
-    next: function() {
-      if (this.pos < this.string.length)
-        return this.string.charAt(this.pos++);
-    },
-    eat: function(match) {
-      var ch = this.string.charAt(this.pos);
-      if (typeof match == "string") var ok = ch == match;
-      else var ok = ch && (match.test ? match.test(ch) : match(ch));
-      if (ok) {++this.pos; return ch;}
-    },
-    eatWhile: function(match) {
-      var start = this.pos;
-      while (this.eat(match)){}
-      return this.pos > start;
-    },
-    eatSpace: function() {
-      var start = this.pos;
-      while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) ++this.pos;
-      return this.pos > start;
-    },
-    skipToEnd: function() {this.pos = this.string.length;},
-    skipTo: function(ch) {
-      var found = this.string.indexOf(ch, this.pos);
-      if (found > -1) {this.pos = found; return true;}
-    },
-    backUp: function(n) {this.pos -= n;},
-    column: function() {
-      if (this.lastColumnPos < this.start) {
-        this.lastColumnValue = countColumn(this.string, this.start, this.tabSize, this.lastColumnPos, this.lastColumnValue);
-        this.lastColumnPos = this.start;
-      }
-      return this.lastColumnValue;
-    },
-    indentation: function() {return countColumn(this.string, null, this.tabSize);},
-    match: function(pattern, consume, caseInsensitive) {
-      if (typeof pattern == "string") {
-        var cased = function(str) {return caseInsensitive ? str.toLowerCase() : str;};
-        var substr = this.string.substr(this.pos, pattern.length);
-        if (cased(substr) == cased(pattern)) {
-          if (consume !== false) this.pos += pattern.length;
-          return true;
-        }
-      } else {
-        var match = this.string.slice(this.pos).match(pattern);
-        if (match && match.index > 0) return null;
-        if (match && consume !== false) this.pos += match[0].length;
-        return match;
-      }
-    },
-    current: function(){return this.string.slice(this.start, this.pos);}
-  };
-  CodeMirror.StringStream = StringStream;
-
-  // TEXTMARKERS
-
-  function TextMarker(doc, type) {
-    this.lines = [];
-    this.type = type;
-    this.doc = doc;
-  }
-  CodeMirror.TextMarker = TextMarker;
-  eventMixin(TextMarker);
-
-  TextMarker.prototype.clear = function() {
-    if (this.explicitlyCleared) return;
-    var cm = this.doc.cm, withOp = cm && !cm.curOp;
-    if (withOp) startOperation(cm);
-    if (hasHandler(this, "clear")) {
-      var found = this.find();
-      if (found) signalLater(this, "clear", found.from, found.to);
-    }
-    var min = null, max = null;
-    for (var i = 0; i < this.lines.length; ++i) {
-      var line = this.lines[i];
-      var span = getMarkedSpanFor(line.markedSpans, this);
-      if (span.to != null) max = lineNo(line);
-      line.markedSpans = removeMarkedSpan(line.markedSpans, span);
-      if (span.from != null)
-        min = lineNo(line);
-      else if (this.collapsed && !lineIsHidden(this.doc, line) && cm)
-        updateLineHeight(line, textHeight(cm.display));
-    }
-    if (cm && this.collapsed && !cm.options.lineWrapping) for (var i = 0; i < this.lines.length; ++i) {
-      var visual = visualLine(cm.doc, this.lines[i]), len = lineLength(cm.doc, visual);
-      if (len > cm.display.maxLineLength) {
-        cm.display.maxLine = visual;
-        cm.display.maxLineLength = len;
-        cm.display.maxLineChanged = true;
-      }
-    }
-
-    if (min != null && cm) regChange(cm, min, max + 1);
-    this.lines.length = 0;
-    this.explicitlyCleared = true;
-    if (this.atomic && this.doc.cantEdit) {
-      this.doc.cantEdit = false;
-      if (cm) reCheckSelection(cm);
-    }
-    if (withOp) endOperation(cm);
-  };
-
-  TextMarker.prototype.find = function() {
-    var from, to;
-    for (var i = 0; i < this.lines.length; ++i) {
-      var line = this.lines[i];
-      var span = getMarkedSpanFor(line.markedSpans, this);
-      if (span.from != null || span.to != null) {
-        var found = lineNo(line);
-        if (span.from != null) from = Pos(found, span.from);
-        if (span.to != null) to = Pos(found, span.to);
-      }
-    }
-    if (this.type == "bookmark") return from;
-    return from && {from: from, to: to};
-  };
-
-  TextMarker.prototype.changed = function() {
-    var pos = this.find(), cm = this.doc.cm;
-    if (!pos || !cm) return;
-    if (this.type != "bookmark") pos = pos.from;
-    var line = getLine(this.doc, pos.line);
-    clearCachedMeasurement(cm, line);
-    if (pos.line >= cm.display.showingFrom && pos.line < cm.display.showingTo) {
-      for (var node = cm.display.lineDiv.firstChild; node; node = node.nextSibling) if (node.lineObj == line) {
-        if (node.offsetHeight != line.height) updateLineHeight(line, node.offsetHeight);
-        break;
-      }
-      runInOp(cm, function() {
-        cm.curOp.selectionChanged = cm.curOp.forceUpdate = cm.curOp.updateMaxLine = true;
-      });
-    }
-  };
-
-  TextMarker.prototype.attachLine = function(line) {
-    if (!this.lines.length && this.doc.cm) {
-      var op = this.doc.cm.curOp;
-      if (!op.maybeHiddenMarkers || indexOf(op.maybeHiddenMarkers, this) == -1)
-        (op.maybeUnhiddenMarkers || (op.maybeUnhiddenMarkers = [])).push(this);
-    }
-    this.lines.push(line);
-  };
-  TextMarker.prototype.detachLine = function(line) {
-    this.lines.splice(indexOf(this.lines, line), 1);
-    if (!this.lines.length && this.doc.cm) {
-      var op = this.doc.cm.curOp;
-      (op.maybeHiddenMarkers || (op.maybeHiddenMarkers = [])).push(this);
-    }
-  };
-
-  function markText(doc, from, to, options, type) {
-    if (options && options.shared) return markTextShared(doc, from, to, options, type);
-    if (doc.cm && !doc.cm.curOp) return operation(doc.cm, markText)(doc, from, to, options, type);
-
-    var marker = new TextMarker(doc, type);
-    if (type == "range" && !posLess(from, to)) return marker;
-    if (options) copyObj(options, marker);
-    if (marker.replacedWith) {
-      marker.collapsed = true;
-      marker.replacedWith = elt("span", [marker.replacedWith], "CodeMirror-widget");
-      if (!options.handleMouseEvents) marker.replacedWith.ignoreEvents = true;
-    }
-    if (marker.collapsed) sawCollapsedSpans = true;
-
-    if (marker.addToHistory)
-      addToHistory(doc, {from: from, to: to, origin: "markText"},
-                   {head: doc.sel.head, anchor: doc.sel.anchor}, NaN);
-
-    var curLine = from.line, size = 0, collapsedAtStart, collapsedAtEnd, cm = doc.cm, updateMaxLine;
-    doc.iter(curLine, to.line + 1, function(line) {
-      if (cm && marker.collapsed && !cm.options.lineWrapping && visualLine(doc, line) == cm.display.maxLine)
-        updateMaxLine = true;
-      var span = {from: null, to: null, marker: marker};
-      size += line.text.length;
-      if (curLine == from.line) {span.from = from.ch; size -= from.ch;}
-      if (curLine == to.line) {span.to = to.ch; size -= line.text.length - to.ch;}
-      if (marker.collapsed) {
-        if (curLine == to.line) collapsedAtEnd = collapsedSpanAt(line, to.ch);
-        if (curLine == from.line) collapsedAtStart = collapsedSpanAt(line, from.ch);
-        else updateLineHeight(line, 0);
-      }
-      addMarkedSpan(line, span);
-      ++curLine;
-    });
-    if (marker.collapsed) doc.iter(from.line, to.line + 1, function(line) {
-      if (lineIsHidden(doc, line)) updateLineHeight(line, 0);
-    });
-
-    if (marker.clearOnEnter) on(marker, "beforeCursorEnter", function() { marker.clear(); });
-
-    if (marker.readOnly) {
-      sawReadOnlySpans = true;
-      if (doc.history.done.length || doc.history.undone.length)
-        doc.clearHistory();
-    }
-    if (marker.collapsed) {
-      if (collapsedAtStart != collapsedAtEnd)
-        throw new Error("Inserting collapsed marker overlapping an existing one");
-      marker.size = size;
-      marker.atomic = true;
-    }
-    if (cm) {
-      if (updateMaxLine) cm.curOp.updateMaxLine = true;
-      if (marker.className || marker.title || marker.startStyle || marker.endStyle || marker.collapsed)
-        regChange(cm, from.line, to.line + 1);
-      if (marker.atomic) reCheckSelection(cm);
-    }
-    return marker;
-  }
-
-  // SHARED TEXTMARKERS
-
-  function SharedTextMarker(markers, primary) {
-    this.markers = markers;
-    this.primary = primary;
-    for (var i = 0, me = this; i < markers.length; ++i) {
-      markers[i].parent = this;
-      on(markers[i], "clear", function(){me.clear();});
-    }
-  }
-  CodeMirror.SharedTextMarker = SharedTextMarker;
-  eventMixin(SharedTextMarker);
-
-  SharedTextMarker.prototype.clear = function() {
-    if (this.explicitlyCleared) return;
-    this.explicitlyCleared = true;
-    for (var i = 0; i < this.markers.length; ++i)
-      this.markers[i].clear();
-    signalLater(this, "clear");
-  };
-  SharedTextMarker.prototype.find = function() {
-    return this.primary.find();
-  };
-
-  function markTextShared(doc, from, to, options, type) {
-    options = copyObj(options);
-    options.shared = false;
-    var markers = [markText(doc, from, to, options, type)], primary = markers[0];
-    var widget = options.replacedWith;
-    linkedDocs(doc, function(doc) {
-      if (widget) options.replacedWith = widget.cloneNode(true);
-      markers.push(markText(doc, clipPos(doc, from), clipPos(doc, to), options, type));
-      for (var i = 0; i < doc.linked.length; ++i)
-        if (doc.linked[i].isParent) return;
-      primary = lst(markers);
-    });
-    return new SharedTextMarker(markers, primary);
-  }
-
-  // TEXTMARKER SPANS
-
-  function getMarkedSpanFor(spans, marker) {
-    if (spans) for (var i = 0; i < spans.length; ++i) {
-      var span = spans[i];
-      if (span.marker == marker) return span;
-    }
-  }
-  function removeMarkedSpan(spans, span) {
-    for (var r, i = 0; i < spans.length; ++i)
-      if (spans[i] != span) (r || (r = [])).push(spans[i]);
-    return r;
-  }
-  function addMarkedSpan(line, span) {
-    line.markedSpans = line.markedSpans ? line.markedSpans.concat([span]) : [span];
-    span.marker.attachLine(line);
-  }
-
-  function markedSpansBefore(old, startCh, isInsert) {
-    if (old) for (var i = 0, nw; i < old.length; ++i) {
-      var span = old[i], marker = span.marker;
-      var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= startCh : span.from < startCh);
-      if (startsBefore || marker.type == "bookmark" && span.from == startCh && (!isInsert || !span.marker.insertLeft)) {
-        var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= startCh : span.to > startCh);
-        (nw || (nw = [])).push({from: span.from,
-                                to: endsAfter ? null : span.to,
-                                marker: marker});
-      }
-    }
-    return nw;
-  }
-
-  function markedSpansAfter(old, endCh, isInsert) {
-    if (old) for (var i = 0, nw; i < old.length; ++i) {
-      var span = old[i], marker = span.marker;
-      var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= endCh : span.to > endCh);
-      if (endsAfter || marker.type == "bookmark" && span.from == endCh && (!isInsert || span.marker.insertLeft)) {
-        var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh);
-        (nw || (nw = [])).push({from: startsBefore ? null : span.from - endCh,
-                                to: span.to == null ? null : span.to - endCh,
-                                marker: marker});
-      }
-    }
-    return nw;
-  }
-
-  function stretchSpansOverChange(doc, change) {
-    var oldFirst = isLine(doc, change.from.line) && getLine(doc, change.from.line).markedSpans;
-    var oldLast = isLine(doc, change.to.line) && getLine(doc, change.to.line).markedSpans;
-    if (!oldFirst && !oldLast) return null;
-
-    var startCh = change.from.ch, endCh = change.to.ch, isInsert = posEq(change.from, change.to);
-    // Get the spans that 'stick out' on both sides
-    var first = markedSpansBefore(oldFirst, startCh, isInsert);
-    var last = markedSpansAfter(oldLast, endCh, isInsert);
-
-    // Next, merge those two ends
-    var sameLine = change.text.length == 1, offset = lst(change.text).length + (sameLine ? startCh : 0);
-    if (first) {
-      // Fix up .to properties of first
-      for (var i = 0; i < first.length; ++i) {
-        var span = first[i];
-        if (span.to == null) {
-          var found = getMarkedSpanFor(last, span.marker);
-          if (!found) span.to = startCh;
-          else if (sameLine) span.to = found.to == null ? null : found.to + offset;
-        }
-      }
-    }
-    if (last) {
-      // Fix up .from in last (or move them into first in case of sameLine)
-      for (var i = 0; i < last.length; ++i) {
-        var span = last[i];
-        if (span.to != null) span.to += offset;
-        if (span.from == null) {
-          var found = getMarkedSpanFor(first, span.marker);
-          if (!found) {
-            span.from = offset;
-            if (sameLine) (first || (first = [])).push(span);
-          }
-        } else {
-          span.from += offset;
-          if (sameLine) (first || (first = [])).push(span);
-        }
-      }
-    }
-    if (sameLine && first) {
-      // Make sure we didn't create any zero-length spans
-      for (var i = 0; i < first.length; ++i)
-        if (first[i].from != null && first[i].from == first[i].to && first[i].marker.type != "bookmark")
-          first.splice(i--, 1);
-      if (!first.length) first = null;
-    }
-
-    var newMarkers = [first];
-    if (!sameLine) {
-      // Fill gap with whole-line-spans
-      var gap = change.text.length - 2, gapMarkers;
-      if (gap > 0 && first)
-        for (var i = 0; i < first.length; ++i)
-          if (first[i].to == null)
-            (gapMarkers || (gapMarkers = [])).push({from: null, to: null, marker: first[i].marker});
-      for (var i = 0; i < gap; ++i)
-        newMarkers.push(gapMarkers);
-      newMarkers.push(last);
-    }
-    return newMarkers;
-  }
-
-  function mergeOldSpans(doc, change) {
-    var old = getOldSpans(doc, change);
-    var stretched = stretchSpansOverChange(doc, change);
-    if (!old) return stretched;
-    if (!stretched) return old;
-
-    for (var i = 0; i < old.length; ++i) {
-      var oldCur = old[i], stretchCur = stretched[i];
-      if (oldCur && stretchCur) {
-        spans: for (var j = 0; j < stretchCur.length; ++j) {
-          var span = stretchCur[j];
-          for (var k = 0; k < oldCur.length; ++k)
-            if (oldCur[k].marker == span.marker) continue spans;
-          oldCur.push(span);
-        }
-      } else if (stretchCur) {
-        old[i] = stretchCur;
-      }
-    }
-    return old;
-  }
-
-  function removeReadOnlyRanges(doc, from, to) {
-    var markers = null;
-    doc.iter(from.line, to.line + 1, function(line) {
-      if (line.markedSpans) for (var i = 0; i < line.markedSpans.length; ++i) {
-        var mark = line.markedSpans[i].marker;
-        if (mark.readOnly && (!markers || indexOf(markers, mark) == -1))
-          (markers || (markers = [])).push(mark);
-      }
-    });
-    if (!markers) return null;
-    var parts = [{from: from, to: to}];
-    for (var i = 0; i < markers.length; ++i) {
-      var mk = markers[i], m = mk.find();
-      for (var j = 0; j < parts.length; ++j) {
-        var p = parts[j];
-        if (posLess(p.to, m.from) || posLess(m.to, p.from)) continue;
-        var newParts = [j, 1];
-        if (posLess(p.from, m.from) || !mk.inclusiveLeft && posEq(p.from, m.from))
-          newParts.push({from: p.from, to: m.from});
-        if (posLess(m.to, p.to) || !mk.inclusiveRight && posEq(p.to, m.to))
-          newParts.push({from: m.to, to: p.to});
-        parts.splice.apply(parts, newParts);
-        j += newParts.length - 1;
-      }
-    }
-    return parts;
-  }
-
-  function collapsedSpanAt(line, ch) {
-    var sps = sawCollapsedSpans && line.markedSpans, found;
-    if (sps) for (var sp, i = 0; i < sps.length; ++i) {
-      sp = sps[i];
-      if (!sp.marker.collapsed) continue;
-      if ((sp.from == null || sp.from < ch) &&
-          (sp.to == null || sp.to > ch) &&
-          (!found || found.width < sp.marker.width))
-        found = sp.marker;
-    }
-    return found;
-  }
-  function collapsedSpanAtStart(line) { return collapsedSpanAt(line, -1); }
-  function collapsedSpanAtEnd(line) { return collapsedSpanAt(line, line.text.length + 1); }
-
-  function visualLine(doc, line) {
-    var merged;
-    while (merged = collapsedSpanAtStart(line))
-      line = getLine(doc, merged.find().from.line);
-    return line;
-  }
-
-  function lineIsHidden(doc, line) {
-    var sps = sawCollapsedSpans && line.markedSpans;
-    if (sps) for (var sp, i = 0; i < sps.length; ++i) {
-      sp = sps[i];
-      if (!sp.marker.collapsed) continue;
-      if (sp.from == null) return true;
-      if (sp.marker.replacedWith) continue;
-      if (sp.from == 0 && sp.marker.inclusiveLeft && lineIsHiddenInner(doc, line, sp))
-        return true;
-    }
-  }
-  function lineIsHiddenInner(doc, line, span) {
-    if (span.to == null) {
-      var end = span.marker.find().to, endLine = getLine(doc, end.line);
-      return lineIsHiddenInner(doc, endLine, getMarkedSpanFor(endLine.markedSpans, span.marker));
-    }
-    if (span.marker.inclusiveRight && span.to == line.text.length)
-      return true;
-    for (var sp, i = 0; i < line.markedSpans.length; ++i) {
-      sp = line.markedSpans[i];
-      if (sp.marker.collapsed && !sp.marker.replacedWith && sp.from == span.to &&
-          (sp.marker.inclusiveLeft || span.marker.inclusiveRight) &&
-          lineIsHiddenInner(doc, line, sp)) return true;
-    }
-  }
-
-  function detachMarkedSpans(line) {
-    var spans = line.markedSpans;
-    if (!spans) return;
-    for (var i = 0; i < spans.length; ++i)
-      spans[i].marker.detachLine(line);
-    line.markedSpans = null;
-  }
-
-  function attachMarkedSpans(line, spans) {
-    if (!spans) return;
-    for (var i = 0; i < spans.length; ++i)
-      spans[i].marker.attachLine(line);
-    line.markedSpans = spans;
-  }
-
-  // LINE WIDGETS
-
-  var LineWidget = CodeMirror.LineWidget = function(cm, node, options) {
-    if (options) for (var opt in options) if (options.hasOwnProperty(opt))
-      this[opt] = options[opt];
-    this.cm = cm;
-    this.node = node;
-  };
-  eventMixin(LineWidget);
-  function widgetOperation(f) {
-    return function() {
-      var withOp = !this.cm.curOp;
-      if (withOp) startOperation(this.cm);
-      try {var result = f.apply(this, arguments);}
-      finally {if (withOp) endOperation(this.cm);}
-      return result;
-    };
-  }
-  LineWidget.prototype.clear = widgetOperation(function() {
-    var ws = this.line.widgets, no = lineNo(this.line);
-    if (no == null || !ws) return;
-    for (var i = 0; i < ws.length; ++i) if (ws[i] == this) ws.splice(i--, 1);
-    if (!ws.length) this.line.widgets = null;
-    var aboveVisible = heightAtLine(this.cm, this.line) < this.cm.doc.scrollTop;
-    updateLineHeight(this.line, Math.max(0, this.line.height - widgetHeight(this)));
-    if (aboveVisible) addToScrollPos(this.cm, 0, -this.height);
-    regChange(this.cm, no, no + 1);
-  });
-  LineWidget.prototype.changed = widgetOperation(function() {
-    var oldH = this.height;
-    this.height = null;
-    var diff = widgetHeight(this) - oldH;
-    if (!diff) return;
-    updateLineHeight(this.line, this.line.height + diff);
-    var no = lineNo(this.line);
-    regChange(this.cm, no, no + 1);
-  });
-
-  function widgetHeight(widget) {
-    if (widget.height != null) return widget.height;
-    if (!widget.node.parentNode || widget.node.parentNode.nodeType != 1)
-      removeChildrenAndAdd(widget.cm.display.measure, elt("div", [widget.node], null, "position: relative"));
-    return widget.height = widget.node.offsetHeight;
-  }
-
-  function addLineWidget(cm, handle, node, options) {
-    var widget = new LineWidget(cm, node, options);
-    if (widget.noHScroll) cm.display.alignWidgets = true;
-    changeLine(cm, handle, function(line) {
-      var widgets = line.widgets || (line.widgets = []);
-      if (widget.insertAt == null) widgets.push(widget);
-      else widgets.splice(Math.min(widgets.length - 1, Math.max(0, widget.insertAt)), 0, widget);
-      widget.line = line;
-      if (!lineIsHidden(cm.doc, line) || widget.showIfHidden) {
-        var aboveVisible = heightAtLine(cm, line) < cm.doc.scrollTop;
-        updateLineHeight(line, line.height + widgetHeight(widget));
-        if (aboveVisible) addToScrollPos(cm, 0, widget.height);
-      }
-      return true;
-    });
-    return widget;
-  }
-
-  // LINE DATA STRUCTURE
-
-  // Line objects. These hold state related to a line, including
-  // highlighting info (the styles array).
-  var Line = CodeMirror.Line = function(text, markedSpans, estimateHeight) {
-    this.text = text;
-    attachMarkedSpans(this, markedSpans);
-    this.height = estimateHeight ? estimateHeight(this) : 1;
-  };
-  eventMixin(Line);
-
-  function updateLine(line, text, markedSpans, estimateHeight) {
-    line.text = text;
-    if (line.stateAfter) line.stateAfter = null;
-    if (line.styles) line.styles = null;
-    if (line.order != null) line.order = null;
-    detachMarkedSpans(line);
-    attachMarkedSpans(line, markedSpans);
-    var estHeight = estimateHeight ? estimateHeight(line) : 1;
-    if (estHeight != line.height) updateLineHeight(line, estHeight);
-  }
-
-  function cleanUpLine(line) {
-    line.parent = null;
-    detachMarkedSpans(line);
-  }
-
-  // Run the given mode's parser over a line, update the styles
-  // array, which contains alternating fragments of text and CSS
-  // classes.
-  function runMode(cm, text, mode, state, f) {
-    var flattenSpans = mode.flattenSpans;
-    if (flattenSpans == null) flattenSpans = cm.options.flattenSpans;
-    var curStart = 0, curStyle = null;
-    var stream = new StringStream(text, cm.options.tabSize), style;
-    if (text == "" && mode.blankLine) mode.blankLine(state);
-    while (!stream.eol()) {
-      if (stream.pos > cm.options.maxHighlightLength) {
-        flattenSpans = false;
-        // Webkit seems to refuse to render text nodes longer than 57444 characters
-        stream.pos = Math.min(text.length, stream.start + 50000);
-        style = null;
-      } else {
-        style = mode.token(stream, state);
-      }
-      if (!flattenSpans || curStyle != style) {
-        if (curStart < stream.start) f(stream.start, curStyle);
-        curStart = stream.start; curStyle = style;
-      }
-      stream.start = stream.pos;
-    }
-    if (curStart < stream.pos) f(stream.pos, curStyle);
-  }
-
-  function highlightLine(cm, line, state) {
-    // A styles array always starts with a number identifying the
-    // mode/overlays that it is based on (for easy invalidation).
-    var st = [cm.state.modeGen];
-    // Compute the base array of styles
-    runMode(cm, line.text, cm.doc.mode, state, function(end, style) {st.push(end, style);});
-
-    // Run overlays, adjust style array.
-    for (var o = 0; o < cm.state.overlays.length; ++o) {
-      var overlay = cm.state.overlays[o], i = 1, at = 0;
-      runMode(cm, line.text, overlay.mode, true, function(end, style) {
-        var start = i;
-        // Ensure there's a token end at the current position, and that i points at it
-        while (at < end) {
-          var i_end = st[i];
-          if (i_end > end)
-            st.splice(i, 1, end, st[i+1], i_end);
-          i += 2;
-          at = Math.min(end, i_end);
-        }
-        if (!style) return;
-        if (overlay.opaque) {
-          st.splice(start, i - start, end, style);
-          i = start + 2;
-        } else {
-          for (; start < i; start += 2) {
-            var cur = st[start+1];
-            st[start+1] = cur ? cur + " " + style : style;
-          }
-        }
-      });
-    }
-
-    return st;
-  }
-
-  function getLineStyles(cm, line) {
-    if (!line.styles || line.styles[0] != cm.state.modeGen)
-      line.styles = highlightLine(cm, line, line.stateAfter = getStateBefore(cm, lineNo(line)));
-    return line.styles;
-  }
-
-  // Lightweight form of highlight -- proceed over this line and
-  // update state, but don't save a style array.
-  function processLine(cm, line, state) {
-    var mode = cm.doc.mode;
-    var stream = new StringStream(line.text, cm.options.tabSize);
-    if (line.text == "" && mode.blankLine) mode.blankLine(state);
-    while (!stream.eol() && stream.pos <= cm.options.maxHighlightLength) {
-      mode.token(stream, state);
-      stream.start = stream.pos;
-    }
-  }
-
-  var styleToClassCache = {};
-  function styleToClass(style) {
-    if (!style) return null;
-    return styleToClassCache[style] ||
-      (styleToClassCache[style] = "cm-" + style.replace(/ +/g, " cm-"));
-  }
-
-  function lineContent(cm, realLine, measure, copyWidgets) {
-    var merged, line = realLine, empty = true;
-    while (merged = collapsedSpanAtStart(line))
-      line = getLine(cm.doc, merged.find().from.line);
-
-    var builder = {pre: elt("pre"), col: 0, pos: 0,
-                   measure: null, measuredSomething: false, cm: cm,
-                   copyWidgets: copyWidgets};
-    if (line.textClass) builder.pre.className = line.textClass;
-
-    do {
-      if (line.text) empty = false;
-      builder.measure = line == realLine && measure;
-      builder.pos = 0;
-      builder.addToken = builder.measure ? buildTokenMeasure : buildToken;
-      if ((ie || webkit) && cm.getOption("lineWrapping"))
-        builder.addToken = buildTokenSplitSpaces(builder.addToken);
-      var next = insertLineContent(line, builder, getLineStyles(cm, line));
-      if (measure && line == realLine && !builder.measuredSomething) {
-        measure[0] = builder.pre.appendChild(zeroWidthElement(cm.display.measure));
-        builder.measuredSomething = true;
-      }
-      if (next) line = getLine(cm.doc, next.to.line);
-    } while (next);
-
-    if (measure && !builder.measuredSomething && !measure[0])
-      measure[0] = builder.pre.appendChild(empty ? elt("span", "\u00a0") : zeroWidthElement(cm.display.measure));
-    if (!builder.pre.firstChild && !lineIsHidden(cm.doc, realLine))
-      builder.pre.appendChild(document.createTextNode("\u00a0"));
-
-    var order;
-    // Work around problem with the reported dimensions of single-char
-    // direction spans on IE (issue #1129). See also the comment in
-    // cursorCoords.
-    if (measure && ie && (order = getOrder(line))) {
-      var l = order.length - 1;
-      if (order[l].from == order[l].to) --l;
-      var last = order[l], prev = order[l - 1];
-      if (last.from + 1 == last.to && prev && last.level < prev.level) {
-        var span = measure[builder.pos - 1];
-        if (span) span.parentNode.insertBefore(span.measureRight = zeroWidthElement(cm.display.measure),
-                                               span.nextSibling);
-      }
-    }
-
-    signal(cm, "renderLine", cm, realLine, builder.pre);
-    return builder.pre;
-  }
-
-  var tokenSpecialChars = /[\t\u0000-\u0019\u00ad\u200b\u2028\u2029\uFEFF]/g;
-  function buildToken(builder, text, style, startStyle, endStyle, title) {
-    if (!text) return;
-    if (!tokenSpecialChars.test(text)) {
-      builder.col += text.length;
-      var content = document.createTextNode(text);
-    } else {
-      var content = document.createDocumentFragment(), pos = 0;
-      while (true) {
-        tokenSpecialChars.lastIndex = pos;
-        var m = tokenSpecialChars.exec(text);
-        var skipped = m ? m.index - pos : text.length - pos;
-        if (skipped) {
-          content.appendChild(document.createTextNode(text.slice(pos, pos + skipped)));
-          builder.col += skipped;
-        }
-        if (!m) break;
-        pos += skipped + 1;
-        if (m[0] == "\t") {
-          var tabSize = builder.cm.options.tabSize, tabWidth = tabSize - builder.col % tabSize;
-          content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"));
-          builder.col += tabWidth;
-        } else {
-          var token = elt("span", "\u2022", "cm-invalidchar");
-          token.title = "\\u" + m[0].charCodeAt(0).toString(16);
-          content.appendChild(token);
-          builder.col += 1;
-        }
-      }
-    }
-    if (style || startStyle || endStyle || builder.measure) {
-      var fullStyle = style || "";
-      if (startStyle) fullStyle += startStyle;
-      if (endStyle) fullStyle += endStyle;
-      var token = elt("span", [content], fullStyle);
-      if (title) token.title = title;
-      return builder.pre.appendChild(token);
-    }
-    builder.pre.appendChild(content);
-  }
-
-  function buildTokenMeasure(builder, text, style, startStyle, endStyle) {
-    var wrapping = builder.cm.options.lineWrapping;
-    for (var i = 0; i < text.length; ++i) {
-      var ch = text.charAt(i), start = i == 0;
-      if (ch >= "\ud800" && ch < "\udbff" && i < text.length - 1) {
-        ch = text.slice(i, i + 2);
-        ++i;
-      } else if (i && wrapping && spanAffectsWrapping(text, i)) {
-        builder.pre.appendChild(elt("wbr"));
-      }
-      var old = builder.measure[builder.pos];
-      var span = builder.measure[builder.pos] =
-        buildToken(builder, ch, style,
-                   start && startStyle, i == text.length - 1 && endStyle);
-      if (old) span.leftSide = old.leftSide || old;
-      // In IE single-space nodes wrap differently than spaces
-      // embedded in larger text nodes, except when set to
-      // white-space: normal (issue #1268).
-      if (ie && wrapping && ch == " " && i && !/\s/.test(text.charAt(i - 1)) &&
-          i < text.length - 1 && !/\s/.test(text.charAt(i + 1)))
-        span.style.whiteSpace = "normal";
-      builder.pos += ch.length;
-    }
-    if (text.length) builder.measuredSomething = true;
-  }
-
-  function buildTokenSplitSpaces(inner) {
-    function split(old) {
-      var out = " ";
-      for (var i = 0; i < old.length - 2; ++i) out += i % 2 ? " " : "\u00a0";
-      out += " ";
-      return out;
-    }
-    return function(builder, text, style, startStyle, endStyle, title) {
-      return inner(builder, text.replace(/ {3,}/, split), style, startStyle, endStyle, title);
-    };
-  }
-
-  function buildCollapsedSpan(builder, size, marker, ignoreWidget) {
-    var widget = !ignoreWidget && marker.replacedWith;
-    if (widget) {
-      if (builder.copyWidgets) widget = widget.cloneNode(true);
-      builder.pre.appendChild(widget);
-      if (builder.measure) {
-        if (size) {
-          builder.measure[builder.pos] = widget;
-        } else {
-          var elt = zeroWidthElement(builder.cm.display.measure);
-          if (marker.type == "bookmark" && !marker.insertLeft)
-            builder.measure[builder.pos] = builder.pre.appendChild(elt);
-          else if (builder.measure[builder.pos])
-            return;
-          else
-            builder.measure[builder.pos] = builder.pre.insertBefore(elt, widget);
-        }
-        builder.measuredSomething = true;
-      }
-    }
-    builder.pos += size;
-  }
-
-  // Outputs a number of spans to make up a line, taking highlighting
-  // and marked text into account.
-  function insertLineContent(line, builder, styles) {
-    var spans = line.markedSpans, allText = line.text, at = 0;
-    if (!spans) {
-      for (var i = 1; i < styles.length; i+=2)
-        builder.addToken(builder, allText.slice(at, at = styles[i]), styleToClass(styles[i+1]));
-      return;
-    }
-
-    var len = allText.length, pos = 0, i = 1, text = "", style;
-    var nextChange = 0, spanStyle, spanEndStyle, spanStartStyle, title, collapsed;
-    for (;;) {
-      if (nextChange == pos) { // Update current marker set
-        spanStyle = spanEndStyle = spanStartStyle = title = "";
-        collapsed = null; nextChange = Infinity;
-        var foundBookmarks = [];
-        for (var j = 0; j < spans.length; ++j) {
-          var sp = spans[j], m = sp.marker;
-          if (sp.from <= pos && (sp.to == null || sp.to > pos)) {
-            if (sp.to != null && nextChange > sp.to) { nextChange = sp.to; spanEndStyle = ""; }
-            if (m.className) spanStyle += " " + m.className;
-            if (m.startStyle && sp.from == pos) spanStartStyle += " " + m.startStyle;
-            if (m.endStyle && sp.to == nextChange) spanEndStyle += " " + m.endStyle;
-            if (m.title && !title) title = m.title;
-            if (m.collapsed && (!collapsed || collapsed.marker.size < m.size))
-              collapsed = sp;
-          } else if (sp.from > pos && nextChange > sp.from) {
-            nextChange = sp.from;
-          }
-          if (m.type == "bookmark" && sp.from == pos && m.replacedWith) foundBookmarks.push(m);
-        }
-        if (collapsed && (collapsed.from || 0) == pos) {
-          buildCollapsedSpan(builder, (collapsed.to == null ? len : collapsed.to) - pos,
-                             collapsed.marker, collapsed.from == null);
-          if (collapsed.to == null) return collapsed.marker.find();
-        }
-        if (!collapsed && foundBookmarks.length) for (var j = 0; j < foundBookmarks.length; ++j)
-          buildCollapsedSpan(builder, 0, foundBookmarks[j]);
-      }
-      if (pos >= len) break;
-
-      var upto = Math.min(len, nextChange);
-      while (true) {
-        if (text) {
-          var end = pos + text.length;
-          if (!collapsed) {
-            var tokenText = end > upto ? text.slice(0, upto - pos) : text;
-            builder.addToken(builder, tokenText, style ? style + spanStyle : spanStyle,
-                             spanStartStyle, pos + tokenText.length == nextChange ? spanEndStyle : "", title);
-          }
-          if (end >= upto) {text = text.slice(upto - pos); pos = upto; break;}
-          pos = end;
-          spanStartStyle = "";
-        }
-        text = allText.slice(at, at = styles[i++]);
-        style = styleToClass(styles[i++]);
+          { textarea.form.submit = realSubmit }
       }
     }
   }
 
-  // DOCUMENT DATA STRUCTURE
+  textarea.style.display = "none"
+  var cm = CodeMirror(function (node) { return textarea.parentNode.insertBefore(node, textarea.nextSibling); },
+    options)
+  return cm
+}
 
-  function updateDoc(doc, change, markedSpans, selAfter, estimateHeight) {
-    function spansFor(n) {return markedSpans ? markedSpans[n] : null;}
-    function update(line, text, spans) {
-      updateLine(line, text, spans, estimateHeight);
-      signalLater(line, "change", line, change);
-    }
+function addLegacyProps(CodeMirror) {
+  CodeMirror.off = off
+  CodeMirror.on = on
+  CodeMirror.wheelEventPixels = wheelEventPixels
+  CodeMirror.Doc = Doc
+  CodeMirror.splitLines = splitLinesAuto
+  CodeMirror.countColumn = countColumn
+  CodeMirror.findColumn = findColumn
+  CodeMirror.isWordChar = isWordCharBasic
+  CodeMirror.Pass = Pass
+  CodeMirror.signal = signal
+  CodeMirror.Line = Line
+  CodeMirror.changeEnd = changeEnd
+  CodeMirror.scrollbarModel = scrollbarModel
+  CodeMirror.Pos = Pos
+  CodeMirror.cmpPos = cmp
+  CodeMirror.modes = modes
+  CodeMirror.mimeModes = mimeModes
+  CodeMirror.resolveMode = resolveMode
+  CodeMirror.getMode = getMode
+  CodeMirror.modeExtensions = modeExtensions
+  CodeMirror.extendMode = extendMode
+  CodeMirror.copyState = copyState
+  CodeMirror.startState = startState
+  CodeMirror.innerMode = innerMode
+  CodeMirror.commands = commands
+  CodeMirror.keyMap = keyMap
+  CodeMirror.keyName = keyName
+  CodeMirror.isModifierKey = isModifierKey
+  CodeMirror.lookupKey = lookupKey
+  CodeMirror.normalizeKeyMap = normalizeKeyMap
+  CodeMirror.StringStream = StringStream
+  CodeMirror.SharedTextMarker = SharedTextMarker
+  CodeMirror.TextMarker = TextMarker
+  CodeMirror.LineWidget = LineWidget
+  CodeMirror.e_preventDefault = e_preventDefault
+  CodeMirror.e_stopPropagation = e_stopPropagation
+  CodeMirror.e_stop = e_stop
+  CodeMirror.addClass = addClass
+  CodeMirror.contains = contains
+  CodeMirror.rmClass = rmClass
+  CodeMirror.keyNames = keyNames
+}
 
-    var from = change.from, to = change.to, text = change.text;
-    var firstLine = getLine(doc, from.line), lastLine = getLine(doc, to.line);
-    var lastText = lst(text), lastSpans = spansFor(text.length - 1), nlines = to.line - from.line;
+// EDITOR CONSTRUCTOR
 
-    // First adjust the line structure
-    if (from.ch == 0 && to.ch == 0 && lastText == "") {
-      // This is a whole-line replace. Treated specially to make
-      // sure line objects move the way they are supposed to.
-      for (var i = 0, e = text.length - 1, added = []; i < e; ++i)
-        added.push(new Line(text[i], spansFor(i), estimateHeight));
-      update(lastLine, lastLine.text, lastSpans);
-      if (nlines) doc.remove(from.line, nlines);
-      if (added.length) doc.insert(from.line, added);
-    } else if (firstLine == lastLine) {
-      if (text.length == 1) {
-        update(firstLine, firstLine.text.slice(0, from.ch) + lastText + firstLine.text.slice(to.ch), lastSpans);
-      } else {
-        for (var added = [], i = 1, e = text.length - 1; i < e; ++i)
-          added.push(new Line(text[i], spansFor(i), estimateHeight));
-        added.push(new Line(lastText + firstLine.text.slice(to.ch), lastSpans, estimateHeight));
-        update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
-        doc.insert(from.line + 1, added);
-      }
-    } else if (text.length == 1) {
-      update(firstLine, firstLine.text.slice(0, from.ch) + text[0] + lastLine.text.slice(to.ch), spansFor(0));
-      doc.remove(from.line + 1, nlines);
-    } else {
-      update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
-      update(lastLine, lastText + lastLine.text.slice(to.ch), lastSpans);
-      for (var i = 1, e = text.length - 1, added = []; i < e; ++i)
-        added.push(new Line(text[i], spansFor(i), estimateHeight));
-      if (nlines > 1) doc.remove(from.line + 1, nlines - 1);
-      doc.insert(from.line + 1, added);
-    }
+defineOptions(CodeMirror)
 
-    signalLater(doc, "change", doc, change);
-    setSelection(doc, selAfter.anchor, selAfter.head, null, true);
-  }
+addEditorMethods(CodeMirror)
 
-  function LeafChunk(lines) {
-    this.lines = lines;
-    this.parent = null;
-    for (var i = 0, e = lines.length, height = 0; i < e; ++i) {
-      lines[i].parent = this;
-      height += lines[i].height;
-    }
-    this.height = height;
-  }
+// Set up methods on CodeMirror's prototype to redirect to the editor's document.
+var dontDelegate = "iter insert remove copy getEditor constructor".split(" ")
+for (var prop in Doc.prototype) { if (Doc.prototype.hasOwnProperty(prop) && indexOf(dontDelegate, prop) < 0)
+  { CodeMirror.prototype[prop] = (function(method) {
+    return function() {return method.apply(this.doc, arguments)}
+  })(Doc.prototype[prop]) } }
 
-  LeafChunk.prototype = {
-    chunkSize: function() { return this.lines.length; },
-    removeInner: function(at, n) {
-      for (var i = at, e = at + n; i < e; ++i) {
-        var line = this.lines[i];
-        this.height -= line.height;
-        cleanUpLine(line);
-        signalLater(line, "delete");
-      }
-      this.lines.splice(at, n);
-    },
-    collapse: function(lines) {
-      lines.splice.apply(lines, [lines.length, 0].concat(this.lines));
-    },
-    insertInner: function(at, lines, height) {
-      this.height += height;
-      this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at));
-      for (var i = 0, e = lines.length; i < e; ++i) lines[i].parent = this;
-    },
-    iterN: function(at, n, op) {
-      for (var e = at + n; at < e; ++at)
-        if (op(this.lines[at])) return true;
-    }
-  };
+eventMixin(Doc)
 
-  function BranchChunk(children) {
-    this.children = children;
-    var size = 0, height = 0;
-    for (var i = 0, e = children.length; i < e; ++i) {
-      var ch = children[i];
-      size += ch.chunkSize(); height += ch.height;
-      ch.parent = this;
-    }
-    this.size = size;
-    this.height = height;
-    this.parent = null;
-  }
+// INPUT HANDLING
 
-  BranchChunk.prototype = {
-    chunkSize: function() { return this.size; },
-    removeInner: function(at, n) {
-      this.size -= n;
-      for (var i = 0; i < this.children.length; ++i) {
-        var child = this.children[i], sz = child.chunkSize();
-        if (at < sz) {
-          var rm = Math.min(n, sz - at), oldHeight = child.height;
-          child.removeInner(at, rm);
-          this.height -= oldHeight - child.height;
-          if (sz == rm) { this.children.splice(i--, 1); child.parent = null; }
-          if ((n -= rm) == 0) break;
-          at = 0;
-        } else at -= sz;
-      }
-      if (this.size - n < 25) {
-        var lines = [];
-        this.collapse(lines);
-        this.children = [new LeafChunk(lines)];
-        this.children[0].parent = this;
-      }
-    },
-    collapse: function(lines) {
-      for (var i = 0, e = this.children.length; i < e; ++i) this.children[i].collapse(lines);
-    },
-    insertInner: function(at, lines, height) {
-      this.size += lines.length;
-      this.height += height;
-      for (var i = 0, e = this.children.length; i < e; ++i) {
-        var child = this.children[i], sz = child.chunkSize();
-        if (at <= sz) {
-          child.insertInner(at, lines, height);
-          if (child.lines && child.lines.length > 50) {
-            while (child.lines.length > 50) {
-              var spilled = child.lines.splice(child.lines.length - 25, 25);
-              var newleaf = new LeafChunk(spilled);
-              child.height -= newleaf.height;
-              this.children.splice(i + 1, 0, newleaf);
-              newleaf.parent = this;
-            }
-            this.maybeSpill();
-          }
-          break;
-        }
-        at -= sz;
-      }
-    },
-    maybeSpill: function() {
-      if (this.children.length <= 10) return;
-      var me = this;
-      do {
-        var spilled = me.children.splice(me.children.length - 5, 5);
-        var sibling = new BranchChunk(spilled);
-        if (!me.parent) { // Become the parent node
-          var copy = new BranchChunk(me.children);
-          copy.parent = me;
-          me.children = [copy, sibling];
-          me = copy;
-        } else {
-          me.size -= sibling.size;
-          me.height -= sibling.height;
-          var myIndex = indexOf(me.parent.children, me);
-          me.parent.children.splice(myIndex + 1, 0, sibling);
-        }
-        sibling.parent = me.parent;
-      } while (me.children.length > 10);
-      me.parent.maybeSpill();
-    },
-    iterN: function(at, n, op) {
-      for (var i = 0, e = this.children.length; i < e; ++i) {
-        var child = this.children[i], sz = child.chunkSize();
-        if (at < sz) {
-          var used = Math.min(n, sz - at);
-          if (child.iterN(at, used, op)) return true;
-          if ((n -= used) == 0) break;
-          at = 0;
-        } else at -= sz;
-      }
-    }
-  };
+CodeMirror.inputStyles = {"textarea": TextareaInput, "contenteditable": ContentEditableInput}
 
-  var nextDocId = 0;
-  var Doc = CodeMirror.Doc = function(text, mode, firstLine) {
-    if (!(this instanceof Doc)) return new Doc(text, mode, firstLine);
-    if (firstLine == null) firstLine = 0;
+// MODE DEFINITION AND QUERYING
 
-    BranchChunk.call(this, [new LeafChunk([new Line("", null)])]);
-    this.first = firstLine;
-    this.scrollTop = this.scrollLeft = 0;
-    this.cantEdit = false;
-    this.history = makeHistory();
-    this.cleanGeneration = 1;
-    this.frontier = firstLine;
-    var start = Pos(firstLine, 0);
-    this.sel = {from: start, to: start, head: start, anchor: start, shift: false, extend: false, goalColumn: null};
-    this.id = ++nextDocId;
-    this.modeOption = mode;
+// Extra arguments are stored as the mode's dependencies, which is
+// used by (legacy) mechanisms like loadmode.js to automatically
+// load a mode. (Preferred mechanism is the require/define calls.)
+CodeMirror.defineMode = function(name/*, mode, …*/) {
+  if (!CodeMirror.defaults.mode && name != "null") { CodeMirror.defaults.mode = name }
+  defineMode.apply(this, arguments)
+}
 
-    if (typeof text == "string") text = splitLines(text);
-    updateDoc(this, {from: start, to: start, text: text}, null, {head: start, anchor: start});
-  };
+CodeMirror.defineMIME = defineMIME
 
-  Doc.prototype = createObj(BranchChunk.prototype, {
-    constructor: Doc,
-    iter: function(from, to, op) {
-      if (op) this.iterN(from - this.first, to - from, op);
-      else this.iterN(this.first, this.first + this.size, from);
-    },
+// Minimal default mode.
+CodeMirror.defineMode("null", function () { return ({token: function (stream) { return stream.skipToEnd(); }}); })
+CodeMirror.defineMIME("text/plain", "null")
 
-    insert: function(at, lines) {
-      var height = 0;
-      for (var i = 0, e = lines.length; i < e; ++i) height += lines[i].height;
-      this.insertInner(at - this.first, lines, height);
-    },
-    remove: function(at, n) { this.removeInner(at - this.first, n); },
+// EXTENSIONS
 
-    getValue: function(lineSep) {
-      var lines = getLines(this, this.first, this.first + this.size);
-      if (lineSep === false) return lines;
-      return lines.join(lineSep || "\n");
-    },
-    setValue: function(code) {
-      var top = Pos(this.first, 0), last = this.first + this.size - 1;
-      makeChange(this, {from: top, to: Pos(last, getLine(this, last).text.length),
-                        text: splitLines(code), origin: "setValue"},
-                 {head: top, anchor: top}, true);
-    },
-    replaceRange: function(code, from, to, origin) {
-      from = clipPos(this, from);
-      to = to ? clipPos(this, to) : from;
-      replaceRange(this, code, from, to, origin);
-    },
-    getRange: function(from, to, lineSep) {
-      var lines = getBetween(this, clipPos(this, from), clipPos(this, to));
-      if (lineSep === false) return lines;
-      return lines.join(lineSep || "\n");
-    },
+CodeMirror.defineExtension = function (name, func) {
+  CodeMirror.prototype[name] = func
+}
+CodeMirror.defineDocExtension = function (name, func) {
+  Doc.prototype[name] = func
+}
 
-    getLine: function(line) {var l = this.getLineHandle(line); return l && l.text;},
-    setLine: function(line, text) {
-      if (isLine(this, line))
-        replaceRange(this, text, Pos(line, 0), clipPos(this, Pos(line)));
-    },
-    removeLine: function(line) {
-      if (line) replaceRange(this, "", clipPos(this, Pos(line - 1)), clipPos(this, Pos(line)));
-      else replaceRange(this, "", Pos(0, 0), clipPos(this, Pos(1, 0)));
-    },
+CodeMirror.fromTextArea = fromTextArea
 
-    getLineHandle: function(line) {if (isLine(this, line)) return getLine(this, line);},
-    getLineNumber: function(line) {return lineNo(line);},
+addLegacyProps(CodeMirror)
 
-    getLineHandleVisualStart: function(line) {
-      if (typeof line == "number") line = getLine(this, line);
-      return visualLine(this, line);
-    },
+CodeMirror.version = "5.25.2"
 
-    lineCount: function() {return this.size;},
-    firstLine: function() {return this.first;},
-    lastLine: function() {return this.first + this.size - 1;},
+return CodeMirror;
 
-    clipPos: function(pos) {return clipPos(this, pos);},
-
-    getCursor: function(start) {
-      var sel = this.sel, pos;
-      if (start == null || start == "head") pos = sel.head;
-      else if (start == "anchor") pos = sel.anchor;
-      else if (start == "end" || start === false) pos = sel.to;
-      else pos = sel.from;
-      return copyPos(pos);
-    },
-    somethingSelected: function() {return !posEq(this.sel.head, this.sel.anchor);},
-
-    setCursor: docOperation(function(line, ch, extend) {
-      var pos = clipPos(this, typeof line == "number" ? Pos(line, ch || 0) : line);
-      if (extend) extendSelection(this, pos);
-      else setSelection(this, pos, pos);
-    }),
-    setSelection: docOperation(function(anchor, head, bias) {
-      setSelection(this, clipPos(this, anchor), clipPos(this, head || anchor), bias);
-    }),
-    extendSelection: docOperation(function(from, to, bias) {
-      extendSelection(this, clipPos(this, from), to && clipPos(this, to), bias);
-    }),
-
-    getSelection: function(lineSep) {return this.getRange(this.sel.from, this.sel.to, lineSep);},
-    replaceSelection: function(code, collapse, origin) {
-      makeChange(this, {from: this.sel.from, to: this.sel.to, text: splitLines(code), origin: origin}, collapse || "around");
-    },
-    undo: docOperation(function() {makeChangeFromHistory(this, "undo");}),
-    redo: docOperation(function() {makeChangeFromHistory(this, "redo");}),
-
-    setExtending: function(val) {this.sel.extend = val;},
-
-    historySize: function() {
-      var hist = this.history;
-      return {undo: hist.done.length, redo: hist.undone.length};
-    },
-    clearHistory: function() {this.history = makeHistory(this.history.maxGeneration);},
-
-    markClean: function() {
-      this.cleanGeneration = this.changeGeneration();
-    },
-    changeGeneration: function() {
-      this.history.lastOp = this.history.lastOrigin = null;
-      return this.history.generation;
-    },
-    isClean: function (gen) {
-      return this.history.generation == (gen || this.cleanGeneration);
-    },
-
-    getHistory: function() {
-      return {done: copyHistoryArray(this.history.done),
-              undone: copyHistoryArray(this.history.undone)};
-    },
-    setHistory: function(histData) {
-      var hist = this.history = makeHistory(this.history.maxGeneration);
-      hist.done = histData.done.slice(0);
-      hist.undone = histData.undone.slice(0);
-    },
-
-    markText: function(from, to, options) {
-      return markText(this, clipPos(this, from), clipPos(this, to), options, "range");
-    },
-    setBookmark: function(pos, options) {
-      var realOpts = {replacedWith: options && (options.nodeType == null ? options.widget : options),
-                      insertLeft: options && options.insertLeft};
-      pos = clipPos(this, pos);
-      return markText(this, pos, pos, realOpts, "bookmark");
-    },
-    findMarksAt: function(pos) {
-      pos = clipPos(this, pos);
-      var markers = [], spans = getLine(this, pos.line).markedSpans;
-      if (spans) for (var i = 0; i < spans.length; ++i) {
-        var span = spans[i];
-        if ((span.from == null || span.from <= pos.ch) &&
-            (span.to == null || span.to >= pos.ch))
-          markers.push(span.marker.parent || span.marker);
-      }
-      return markers;
-    },
-    getAllMarks: function() {
-      var markers = [];
-      this.iter(function(line) {
-        var sps = line.markedSpans;
-        if (sps) for (var i = 0; i < sps.length; ++i)
-          if (sps[i].from != null) markers.push(sps[i].marker);
-      });
-      return markers;
-    },
-
-    posFromIndex: function(off) {
-      var ch, lineNo = this.first;
-      this.iter(function(line) {
-        var sz = line.text.length + 1;
-        if (sz > off) { ch = off; return true; }
-        off -= sz;
-        ++lineNo;
-      });
-      return clipPos(this, Pos(lineNo, ch));
-    },
-    indexFromPos: function (coords) {
-      coords = clipPos(this, coords);
-      var index = coords.ch;
-      if (coords.line < this.first || coords.ch < 0) return 0;
-      this.iter(this.first, coords.line, function (line) {
-        index += line.text.length + 1;
-      });
-      return index;
-    },
-
-    copy: function(copyHistory) {
-      var doc = new Doc(getLines(this, this.first, this.first + this.size), this.modeOption, this.first);
-      doc.scrollTop = this.scrollTop; doc.scrollLeft = this.scrollLeft;
-      doc.sel = {from: this.sel.from, to: this.sel.to, head: this.sel.head, anchor: this.sel.anchor,
-                 shift: this.sel.shift, extend: false, goalColumn: this.sel.goalColumn};
-      if (copyHistory) {
-        doc.history.undoDepth = this.history.undoDepth;
-        doc.setHistory(this.getHistory());
-      }
-      return doc;
-    },
-
-    linkedDoc: function(options) {
-      if (!options) options = {};
-      var from = this.first, to = this.first + this.size;
-      if (options.from != null && options.from > from) from = options.from;
-      if (options.to != null && options.to < to) to = options.to;
-      var copy = new Doc(getLines(this, from, to), options.mode || this.modeOption, from);
-      if (options.sharedHist) copy.history = this.history;
-      (this.linked || (this.linked = [])).push({doc: copy, sharedHist: options.sharedHist});
-      copy.linked = [{doc: this, isParent: true, sharedHist: options.sharedHist}];
-      return copy;
-    },
-    unlinkDoc: function(other) {
-      if (other instanceof CodeMirror) other = other.doc;
-      if (this.linked) for (var i = 0; i < this.linked.length; ++i) {
-        var link = this.linked[i];
-        if (link.doc != other) continue;
-        this.linked.splice(i, 1);
-        other.unlinkDoc(this);
-        break;
-      }
-      // If the histories were shared, split them again
-      if (other.history == this.history) {
-        var splitIds = [other.id];
-        linkedDocs(other, function(doc) {splitIds.push(doc.id);}, true);
-        other.history = makeHistory();
-        other.history.done = copyHistoryArray(this.history.done, splitIds);
-        other.history.undone = copyHistoryArray(this.history.undone, splitIds);
-      }
-    },
-    iterLinkedDocs: function(f) {linkedDocs(this, f);},
-
-    getMode: function() {return this.mode;},
-    getEditor: function() {return this.cm;}
-  });
-
-  Doc.prototype.eachLine = Doc.prototype.iter;
-
-  // The Doc methods that should be available on CodeMirror instances
-  var dontDelegate = "iter insert remove copy getEditor".split(" ");
-  for (var prop in Doc.prototype) if (Doc.prototype.hasOwnProperty(prop) && indexOf(dontDelegate, prop) < 0)
-    CodeMirror.prototype[prop] = (function(method) {
-      return function() {return method.apply(this.doc, arguments);};
-    })(Doc.prototype[prop]);
-
-  eventMixin(Doc);
-
-  function linkedDocs(doc, f, sharedHistOnly) {
-    function propagate(doc, skip, sharedHist) {
-      if (doc.linked) for (var i = 0; i < doc.linked.length; ++i) {
-        var rel = doc.linked[i];
-        if (rel.doc == skip) continue;
-        var shared = sharedHist && rel.sharedHist;
-        if (sharedHistOnly && !shared) continue;
-        f(rel.doc, shared);
-        propagate(rel.doc, doc, shared);
-      }
-    }
-    propagate(doc, null, true);
-  }
-
-  function attachDoc(cm, doc) {
-    if (doc.cm) throw new Error("This document is already in use.");
-    cm.doc = doc;
-    doc.cm = cm;
-    estimateLineHeights(cm);
-    loadMode(cm);
-    if (!cm.options.lineWrapping) computeMaxLength(cm);
-    cm.options.mode = doc.modeOption;
-    regChange(cm);
-  }
-
-  // LINE UTILITIES
-
-  function getLine(chunk, n) {
-    n -= chunk.first;
-    while (!chunk.lines) {
-      for (var i = 0;; ++i) {
-        var child = chunk.children[i], sz = child.chunkSize();
-        if (n < sz) { chunk = child; break; }
-        n -= sz;
-      }
-    }
-    return chunk.lines[n];
-  }
-
-  function getBetween(doc, start, end) {
-    var out = [], n = start.line;
-    doc.iter(start.line, end.line + 1, function(line) {
-      var text = line.text;
-      if (n == end.line) text = text.slice(0, end.ch);
-      if (n == start.line) text = text.slice(start.ch);
-      out.push(text);
-      ++n;
-    });
-    return out;
-  }
-  function getLines(doc, from, to) {
-    var out = [];
-    doc.iter(from, to, function(line) { out.push(line.text); });
-    return out;
-  }
-
-  function updateLineHeight(line, height) {
-    var diff = height - line.height;
-    for (var n = line; n; n = n.parent) n.height += diff;
-  }
-
-  function lineNo(line) {
-    if (line.parent == null) return null;
-    var cur = line.parent, no = indexOf(cur.lines, line);
-    for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
-      for (var i = 0;; ++i) {
-        if (chunk.children[i] == cur) break;
-        no += chunk.children[i].chunkSize();
-      }
-    }
-    return no + cur.first;
-  }
-
-  function lineAtHeight(chunk, h) {
-    var n = chunk.first;
-    outer: do {
-      for (var i = 0, e = chunk.children.length; i < e; ++i) {
-        var child = chunk.children[i], ch = child.height;
-        if (h < ch) { chunk = child; continue outer; }
-        h -= ch;
-        n += child.chunkSize();
-      }
-      return n;
-    } while (!chunk.lines);
-    for (var i = 0, e = chunk.lines.length; i < e; ++i) {
-      var line = chunk.lines[i], lh = line.height;
-      if (h < lh) break;
-      h -= lh;
-    }
-    return n + i;
-  }
-
-  function heightAtLine(cm, lineObj) {
-    lineObj = visualLine(cm.doc, lineObj);
-
-    var h = 0, chunk = lineObj.parent;
-    for (var i = 0; i < chunk.lines.length; ++i) {
-      var line = chunk.lines[i];
-      if (line == lineObj) break;
-      else h += line.height;
-    }
-    for (var p = chunk.parent; p; chunk = p, p = chunk.parent) {
-      for (var i = 0; i < p.children.length; ++i) {
-        var cur = p.children[i];
-        if (cur == chunk) break;
-        else h += cur.height;
-      }
-    }
-    return h;
-  }
-
-  function getOrder(line) {
-    var order = line.order;
-    if (order == null) order = line.order = bidiOrdering(line.text);
-    return order;
-  }
-
-  // HISTORY
-
-  function makeHistory(startGen) {
-    return {
-      // Arrays of history events. Doing something adds an event to
-      // done and clears undo. Undoing moves events from done to
-      // undone, redoing moves them in the other direction.
-      done: [], undone: [], undoDepth: Infinity,
-      // Used to track when changes can be merged into a single undo
-      // event
-      lastTime: 0, lastOp: null, lastOrigin: null,
-      // Used by the isClean() method
-      generation: startGen || 1, maxGeneration: startGen || 1
-    };
-  }
-
-  function attachLocalSpans(doc, change, from, to) {
-    var existing = change["spans_" + doc.id], n = 0;
-    doc.iter(Math.max(doc.first, from), Math.min(doc.first + doc.size, to), function(line) {
-      if (line.markedSpans)
-        (existing || (existing = change["spans_" + doc.id] = {}))[n] = line.markedSpans;
-      ++n;
-    });
-  }
-
-  function historyChangeFromChange(doc, change) {
-    var from = { line: change.from.line, ch: change.from.ch };
-    var histChange = {from: from, to: changeEnd(change), text: getBetween(doc, change.from, change.to)};
-    attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);
-    linkedDocs(doc, function(doc) {attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);}, true);
-    return histChange;
-  }
-
-  function addToHistory(doc, change, selAfter, opId) {
-    var hist = doc.history;
-    hist.undone.length = 0;
-    var time = +new Date, cur = lst(hist.done);
-
-    if (cur &&
-        (hist.lastOp == opId ||
-         hist.lastOrigin == change.origin && change.origin &&
-         ((change.origin.charAt(0) == "+" && doc.cm && hist.lastTime > time - doc.cm.options.historyEventDelay) ||
-          change.origin.charAt(0) == "*"))) {
-      // Merge this change into the last event
-      var last = lst(cur.changes);
-      if (posEq(change.from, change.to) && posEq(change.from, last.to)) {
-        // Optimized case for simple insertion -- don't want to add
-        // new changesets for every character typed
-        last.to = changeEnd(change);
-      } else {
-        // Add new sub-event
-        cur.changes.push(historyChangeFromChange(doc, change));
-      }
-      cur.anchorAfter = selAfter.anchor; cur.headAfter = selAfter.head;
-    } else {
-      // Can not be merged, start a new event.
-      cur = {changes: [historyChangeFromChange(doc, change)],
-             generation: hist.generation,
-             anchorBefore: doc.sel.anchor, headBefore: doc.sel.head,
-             anchorAfter: selAfter.anchor, headAfter: selAfter.head};
-      hist.done.push(cur);
-      hist.generation = ++hist.maxGeneration;
-      while (hist.done.length > hist.undoDepth)
-        hist.done.shift();
-    }
-    hist.lastTime = time;
-    hist.lastOp = opId;
-    hist.lastOrigin = change.origin;
-  }
-
-  function removeClearedSpans(spans) {
-    if (!spans) return null;
-    for (var i = 0, out; i < spans.length; ++i) {
-      if (spans[i].marker.explicitlyCleared) { if (!out) out = spans.slice(0, i); }
-      else if (out) out.push(spans[i]);
-    }
-    return !out ? spans : out.length ? out : null;
-  }
-
-  function getOldSpans(doc, change) {
-    var found = change["spans_" + doc.id];
-    if (!found) return null;
-    for (var i = 0, nw = []; i < change.text.length; ++i)
-      nw.push(removeClearedSpans(found[i]));
-    return nw;
-  }
-
-  // Used both to provide a JSON-safe object in .getHistory, and, when
-  // detaching a document, to split the history in two
-  function copyHistoryArray(events, newGroup) {
-    for (var i = 0, copy = []; i < events.length; ++i) {
-      var event = events[i], changes = event.changes, newChanges = [];
-      copy.push({changes: newChanges, anchorBefore: event.anchorBefore, headBefore: event.headBefore,
-                 anchorAfter: event.anchorAfter, headAfter: event.headAfter});
-      for (var j = 0; j < changes.length; ++j) {
-        var change = changes[j], m;
-        newChanges.push({from: change.from, to: change.to, text: change.text});
-        if (newGroup) for (var prop in change) if (m = prop.match(/^spans_(\d+)$/)) {
-          if (indexOf(newGroup, Number(m[1])) > -1) {
-            lst(newChanges)[prop] = change[prop];
-            delete change[prop];
-          }
-        }
-      }
-    }
-    return copy;
-  }
-
-  // Rebasing/resetting history to deal with externally-sourced changes
-
-  function rebaseHistSel(pos, from, to, diff) {
-    if (to < pos.line) {
-      pos.line += diff;
-    } else if (from < pos.line) {
-      pos.line = from;
-      pos.ch = 0;
-    }
-  }
-
-  // Tries to rebase an array of history events given a change in the
-  // document. If the change touches the same lines as the event, the
-  // event, and everything 'behind' it, is discarded. If the change is
-  // before the event, the event's positions are updated. Uses a
-  // copy-on-write scheme for the positions, to avoid having to
-  // reallocate them all on every rebase, but also avoid problems with
-  // shared position objects being unsafely updated.
-  function rebaseHistArray(array, from, to, diff) {
-    for (var i = 0; i < array.length; ++i) {
-      var sub = array[i], ok = true;
-      for (var j = 0; j < sub.changes.length; ++j) {
-        var cur = sub.changes[j];
-        if (!sub.copied) { cur.from = copyPos(cur.from); cur.to = copyPos(cur.to); }
-        if (to < cur.from.line) {
-          cur.from.line += diff;
-          cur.to.line += diff;
-        } else if (from <= cur.to.line) {
-          ok = false;
-          break;
-        }
-      }
-      if (!sub.copied) {
-        sub.anchorBefore = copyPos(sub.anchorBefore); sub.headBefore = copyPos(sub.headBefore);
-        sub.anchorAfter = copyPos(sub.anchorAfter); sub.readAfter = copyPos(sub.headAfter);
-        sub.copied = true;
-      }
-      if (!ok) {
-        array.splice(0, i + 1);
-        i = 0;
-      } else {
-        rebaseHistSel(sub.anchorBefore); rebaseHistSel(sub.headBefore);
-        rebaseHistSel(sub.anchorAfter); rebaseHistSel(sub.headAfter);
-      }
-    }
-  }
-
-  function rebaseHist(hist, change) {
-    var from = change.from.line, to = change.to.line, diff = change.text.length - (to - from) - 1;
-    rebaseHistArray(hist.done, from, to, diff);
-    rebaseHistArray(hist.undone, from, to, diff);
-  }
-
-  // EVENT OPERATORS
-
-  function stopMethod() {e_stop(this);}
-  // Ensure an event has a stop method.
-  function addStop(event) {
-    if (!event.stop) event.stop = stopMethod;
-    return event;
-  }
-
-  function e_preventDefault(e) {
-    if (e.preventDefault) e.preventDefault();
-    else e.returnValue = false;
-  }
-  function e_stopPropagation(e) {
-    if (e.stopPropagation) e.stopPropagation();
-    else e.cancelBubble = true;
-  }
-  function e_defaultPrevented(e) {
-    return e.defaultPrevented != null ? e.defaultPrevented : e.returnValue == false;
-  }
-  function e_stop(e) {e_preventDefault(e); e_stopPropagation(e);}
-  CodeMirror.e_stop = e_stop;
-  CodeMirror.e_preventDefault = e_preventDefault;
-  CodeMirror.e_stopPropagation = e_stopPropagation;
-
-  function e_target(e) {return e.target || e.srcElement;}
-  function e_button(e) {
-    var b = e.which;
-    if (b == null) {
-      if (e.button & 1) b = 1;
-      else if (e.button & 2) b = 3;
-      else if (e.button & 4) b = 2;
-    }
-    if (mac && e.ctrlKey && b == 1) b = 3;
-    return b;
-  }
-
-  // EVENT HANDLING
-
-  function on(emitter, type, f) {
-    if (emitter.addEventListener)
-      emitter.addEventListener(type, f, false);
-    else if (emitter.attachEvent)
-      emitter.attachEvent("on" + type, f);
-    else {
-      var map = emitter._handlers || (emitter._handlers = {});
-      var arr = map[type] || (map[type] = []);
-      arr.push(f);
-    }
-  }
-
-  function off(emitter, type, f) {
-    if (emitter.removeEventListener)
-      emitter.removeEventListener(type, f, false);
-    else if (emitter.detachEvent)
-      emitter.detachEvent("on" + type, f);
-    else {
-      var arr = emitter._handlers && emitter._handlers[type];
-      if (!arr) return;
-      for (var i = 0; i < arr.length; ++i)
-        if (arr[i] == f) { arr.splice(i, 1); break; }
-    }
-  }
-
-  function signal(emitter, type /*, values...*/) {
-    var arr = emitter._handlers && emitter._handlers[type];
-    if (!arr) return;
-    var args = Array.prototype.slice.call(arguments, 2);
-    for (var i = 0; i < arr.length; ++i) arr[i].apply(null, args);
-  }
-
-  var delayedCallbacks, delayedCallbackDepth = 0;
-  function signalLater(emitter, type /*, values...*/) {
-    var arr = emitter._handlers && emitter._handlers[type];
-    if (!arr) return;
-    var args = Array.prototype.slice.call(arguments, 2);
-    if (!delayedCallbacks) {
-      ++delayedCallbackDepth;
-      delayedCallbacks = [];
-      setTimeout(fireDelayed, 0);
-    }
-    function bnd(f) {return function(){f.apply(null, args);};};
-    for (var i = 0; i < arr.length; ++i)
-      delayedCallbacks.push(bnd(arr[i]));
-  }
-
-  function signalDOMEvent(cm, e, override) {
-    signal(cm, override || e.type, cm, e);
-    return e_defaultPrevented(e) || e.codemirrorIgnore;
-  }
-
-  function fireDelayed() {
-    --delayedCallbackDepth;
-    var delayed = delayedCallbacks;
-    delayedCallbacks = null;
-    for (var i = 0; i < delayed.length; ++i) delayed[i]();
-  }
-
-  function hasHandler(emitter, type) {
-    var arr = emitter._handlers && emitter._handlers[type];
-    return arr && arr.length > 0;
-  }
-
-  CodeMirror.on = on; CodeMirror.off = off; CodeMirror.signal = signal;
-
-  function eventMixin(ctor) {
-    ctor.prototype.on = function(type, f) {on(this, type, f);};
-    ctor.prototype.off = function(type, f) {off(this, type, f);};
-  }
-
-  // MISC UTILITIES
-
-  // Number of pixels added to scroller and sizer to hide scrollbar
-  var scrollerCutOff = 30;
-
-  // Returned or thrown by various protocols to signal 'I'm not
-  // handling this'.
-  var Pass = CodeMirror.Pass = {toString: function(){return "CodeMirror.Pass";}};
-
-  function Delayed() {this.id = null;}
-  Delayed.prototype = {set: function(ms, f) {clearTimeout(this.id); this.id = setTimeout(f, ms);}};
-
-  // Counts the column offset in a string, taking tabs into account.
-  // Used mostly to find indentation.
-  function countColumn(string, end, tabSize, startIndex, startValue) {
-    if (end == null) {
-      end = string.search(/[^\s\u00a0]/);
-      if (end == -1) end = string.length;
-    }
-    for (var i = startIndex || 0, n = startValue || 0; i < end; ++i) {
-      if (string.charAt(i) == "\t") n += tabSize - (n % tabSize);
-      else ++n;
-    }
-    return n;
-  }
-  CodeMirror.countColumn = countColumn;
-
-  var spaceStrs = [""];
-  function spaceStr(n) {
-    while (spaceStrs.length <= n)
-      spaceStrs.push(lst(spaceStrs) + " ");
-    return spaceStrs[n];
-  }
-
-  function lst(arr) { return arr[arr.length-1]; }
-
-  function selectInput(node) {
-    if (ios) { // Mobile Safari apparently has a bug where select() is broken.
-      node.selectionStart = 0;
-      node.selectionEnd = node.value.length;
-    } else {
-      // Suppress mysterious IE10 errors
-      try { node.select(); }
-      catch(_e) {}
-    }
-  }
-
-  function indexOf(collection, elt) {
-    if (collection.indexOf) return collection.indexOf(elt);
-    for (var i = 0, e = collection.length; i < e; ++i)
-      if (collection[i] == elt) return i;
-    return -1;
-  }
-
-  function createObj(base, props) {
-    function Obj() {}
-    Obj.prototype = base;
-    var inst = new Obj();
-    if (props) copyObj(props, inst);
-    return inst;
-  }
-
-  function copyObj(obj, target) {
-    if (!target) target = {};
-    for (var prop in obj) if (obj.hasOwnProperty(prop)) target[prop] = obj[prop];
-    return target;
-  }
-
-  function emptyArray(size) {
-    for (var a = [], i = 0; i < size; ++i) a.push(undefined);
-    return a;
-  }
-
-  function bind(f) {
-    var args = Array.prototype.slice.call(arguments, 1);
-    return function(){return f.apply(null, args);};
-  }
-
-  var nonASCIISingleCaseWordChar = /[\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc\uac00-\ud7af]/;
-  function isWordChar(ch) {
-    return /\w/.test(ch) || ch > "\x80" &&
-      (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch));
-  }
-
-  function isEmpty(obj) {
-    for (var n in obj) if (obj.hasOwnProperty(n) && obj[n]) return false;
-    return true;
-  }
-
-  var isExtendingChar = /[\u0300-\u036F\u0483-\u0487\u0488-\u0489\u0591-\u05BD\u05BF\u05C1-\u05C2\u05C4-\u05C5\u05C7\u0610-\u061A\u064B-\u065F\u0670\u06D6-\u06DC\u06DF-\u06E4\u06E7-\u06E8\u06EA-\u06ED\uA66F\uA670-\uA672\uA674-\uA67D\uA69F\udc00-\udfff]/;
-
-  // DOM UTILITIES
-
-  function elt(tag, content, className, style) {
-    var e = document.createElement(tag);
-    if (className) e.className = className;
-    if (style) e.style.cssText = style;
-    if (typeof content == "string") setTextContent(e, content);
-    else if (content) for (var i = 0; i < content.length; ++i) e.appendChild(content[i]);
-    return e;
-  }
-
-  function removeChildren(e) {
-    for (var count = e.childNodes.length; count > 0; --count)
-      e.removeChild(e.firstChild);
-    return e;
-  }
-
-  function removeChildrenAndAdd(parent, e) {
-    return removeChildren(parent).appendChild(e);
-  }
-
-  function setTextContent(e, str) {
-    if (ie_lt9) {
-      e.innerHTML = "";
-      e.appendChild(document.createTextNode(str));
-    } else e.textContent = str;
-  }
-
-  function getRect(node) {
-    return node.getBoundingClientRect();
-  }
-  CodeMirror.replaceGetRect = function(f) { getRect = f; };
-
-  // FEATURE DETECTION
-
-  // Detect drag-and-drop
-  var dragAndDrop = function() {
-    // There is *some* kind of drag-and-drop support in IE6-8, but I
-    // couldn't get it to work yet.
-    if (ie_lt9) return false;
-    var div = elt('div');
-    return "draggable" in div || "dragDrop" in div;
-  }();
-
-  // For a reason I have yet to figure out, some browsers disallow
-  // word wrapping between certain characters *only* if a new inline
-  // element is started between them. This makes it hard to reliably
-  // measure the position of things, since that requires inserting an
-  // extra span. This terribly fragile set of tests matches the
-  // character combinations that suffer from this phenomenon on the
-  // various browsers.
-  function spanAffectsWrapping() { return false; }
-  if (gecko) // Only for "$'"
-    spanAffectsWrapping = function(str, i) {
-      return str.charCodeAt(i - 1) == 36 && str.charCodeAt(i) == 39;
-    };
-  else if (safari && !/Version\/([6-9]|\d\d)\b/.test(navigator.userAgent))
-    spanAffectsWrapping = function(str, i) {
-      return /\-[^ \-?]|\?[^ !\'\"\),.\-\/:;\?\]\}]/.test(str.slice(i - 1, i + 1));
-    };
-  else if (webkit && !/Chrome\/(?:29|[3-9]\d|\d\d\d)\./.test(navigator.userAgent))
-    spanAffectsWrapping = function(str, i) {
-      if (i > 1 && str.charCodeAt(i - 1) == 45) {
-        if (/\w/.test(str.charAt(i - 2)) && /[^\-?\.]/.test(str.charAt(i))) return true;
-        if (i > 2 && /[\d\.,]/.test(str.charAt(i - 2)) && /[\d\.,]/.test(str.charAt(i))) return false;
-      }
-      return /[~!#%&*)=+}\]|\"\.>,:;][({[<]|-[^\-?\.\u2010-\u201f\u2026]|\?[\w~`@#$%\^&*(_=+{[|><]|…[\w~`@#$%\^&*(_=+{[><]/.test(str.slice(i - 1, i + 1));
-    };
-
-  var knownScrollbarWidth;
-  function scrollbarWidth(measure) {
-    if (knownScrollbarWidth != null) return knownScrollbarWidth;
-    var test = elt("div", null, null, "width: 50px; height: 50px; overflow-x: scroll");
-    removeChildrenAndAdd(measure, test);
-    if (test.offsetWidth)
-      knownScrollbarWidth = test.offsetHeight - test.clientHeight;
-    return knownScrollbarWidth || 0;
-  }
-
-  var zwspSupported;
-  function zeroWidthElement(measure) {
-    if (zwspSupported == null) {
-      var test = elt("span", "\u200b");
-      removeChildrenAndAdd(measure, elt("span", [test, document.createTextNode("x")]));
-      if (measure.firstChild.offsetHeight != 0)
-        zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !ie_lt8;
-    }
-    if (zwspSupported) return elt("span", "\u200b");
-    else return elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px");
-  }
-
-  // See if "".split is the broken IE version, if so, provide an
-  // alternative way to split lines.
-  var splitLines = "\n\nb".split(/\n/).length != 3 ? function(string) {
-    var pos = 0, result = [], l = string.length;
-    while (pos <= l) {
-      var nl = string.indexOf("\n", pos);
-      if (nl == -1) nl = string.length;
-      var line = string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl);
-      var rt = line.indexOf("\r");
-      if (rt != -1) {
-        result.push(line.slice(0, rt));
-        pos += rt + 1;
-      } else {
-        result.push(line);
-        pos = nl + 1;
-      }
-    }
-    return result;
-  } : function(string){return string.split(/\r\n?|\n/);};
-  CodeMirror.splitLines = splitLines;
-
-  var hasSelection = window.getSelection ? function(te) {
-    try { return te.selectionStart != te.selectionEnd; }
-    catch(e) { return false; }
-  } : function(te) {
-    try {var range = te.ownerDocument.selection.createRange();}
-    catch(e) {}
-    if (!range || range.parentElement() != te) return false;
-    return range.compareEndPoints("StartToEnd", range) != 0;
-  };
-
-  var hasCopyEvent = (function() {
-    var e = elt("div");
-    if ("oncopy" in e) return true;
-    e.setAttribute("oncopy", "return;");
-    return typeof e.oncopy == 'function';
-  })();
-
-  // KEY NAMING
-
-  var keyNames = {3: "Enter", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",
-                  19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",
-                  36: "Home", 37: "Left", 38: "Up", 39: "Right", 40: "Down", 44: "PrintScrn", 45: "Insert",
-                  46: "Delete", 59: ";", 91: "Mod", 92: "Mod", 93: "Mod", 109: "-", 107: "=", 127: "Delete",
-                  186: ";", 187: "=", 188: ",", 189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\",
-                  221: "]", 222: "'", 63276: "PageUp", 63277: "PageDown", 63275: "End", 63273: "Home",
-                  63234: "Left", 63232: "Up", 63235: "Right", 63233: "Down", 63302: "Insert", 63272: "Delete"};
-  CodeMirror.keyNames = keyNames;
-  (function() {
-    // Number keys
-    for (var i = 0; i < 10; i++) keyNames[i + 48] = String(i);
-    // Alphabetic keys
-    for (var i = 65; i <= 90; i++) keyNames[i] = String.fromCharCode(i);
-    // Function keys
-    for (var i = 1; i <= 12; i++) keyNames[i + 111] = keyNames[i + 63235] = "F" + i;
-  })();
-
-  // BIDI HELPERS
-
-  function iterateBidiSections(order, from, to, f) {
-    if (!order) return f(from, to, "ltr");
-    var found = false;
-    for (var i = 0; i < order.length; ++i) {
-      var part = order[i];
-      if (part.from < to && part.to > from || from == to && part.to == from) {
-        f(Math.max(part.from, from), Math.min(part.to, to), part.level == 1 ? "rtl" : "ltr");
-        found = true;
-      }
-    }
-    if (!found) f(from, to, "ltr");
-  }
-
-  function bidiLeft(part) { return part.level % 2 ? part.to : part.from; }
-  function bidiRight(part) { return part.level % 2 ? part.from : part.to; }
-
-  function lineLeft(line) { var order = getOrder(line); return order ? bidiLeft(order[0]) : 0; }
-  function lineRight(line) {
-    var order = getOrder(line);
-    if (!order) return line.text.length;
-    return bidiRight(lst(order));
-  }
-
-  function lineStart(cm, lineN) {
-    var line = getLine(cm.doc, lineN);
-    var visual = visualLine(cm.doc, line);
-    if (visual != line) lineN = lineNo(visual);
-    var order = getOrder(visual);
-    var ch = !order ? 0 : order[0].level % 2 ? lineRight(visual) : lineLeft(visual);
-    return Pos(lineN, ch);
-  }
-  function lineEnd(cm, lineN) {
-    var merged, line;
-    while (merged = collapsedSpanAtEnd(line = getLine(cm.doc, lineN)))
-      lineN = merged.find().to.line;
-    var order = getOrder(line);
-    var ch = !order ? line.text.length : order[0].level % 2 ? lineLeft(line) : lineRight(line);
-    return Pos(lineN, ch);
-  }
-
-  function compareBidiLevel(order, a, b) {
-    var linedir = order[0].level;
-    if (a == linedir) return true;
-    if (b == linedir) return false;
-    return a < b;
-  }
-  var bidiOther;
-  function getBidiPartAt(order, pos) {
-    for (var i = 0, found; i < order.length; ++i) {
-      var cur = order[i];
-      if (cur.from < pos && cur.to > pos) { bidiOther = null; return i; }
-      if (cur.from == pos || cur.to == pos) {
-        if (found == null) {
-          found = i;
-        } else if (compareBidiLevel(order, cur.level, order[found].level)) {
-          bidiOther = found;
-          return i;
-        } else {
-          bidiOther = i;
-          return found;
-        }
-      }
-    }
-    bidiOther = null;
-    return found;
-  }
-
-  function moveInLine(line, pos, dir, byUnit) {
-    if (!byUnit) return pos + dir;
-    do pos += dir;
-    while (pos > 0 && isExtendingChar.test(line.text.charAt(pos)));
-    return pos;
-  }
-
-  // This is somewhat involved. It is needed in order to move
-  // 'visually' through bi-directional text -- i.e., pressing left
-  // should make the cursor go left, even when in RTL text. The
-  // tricky part is the 'jumps', where RTL and LTR text touch each
-  // other. This often requires the cursor offset to move more than
-  // one unit, in order to visually move one unit.
-  function moveVisually(line, start, dir, byUnit) {
-    var bidi = getOrder(line);
-    if (!bidi) return moveLogically(line, start, dir, byUnit);
-    var pos = getBidiPartAt(bidi, start), part = bidi[pos];
-    var target = moveInLine(line, start, part.level % 2 ? -dir : dir, byUnit);
-
-    for (;;) {
-      if (target > part.from && target < part.to) return target;
-      if (target == part.from || target == part.to) {
-        if (getBidiPartAt(bidi, target) == pos) return target;
-        part = bidi[pos += dir];
-        return (dir > 0) == part.level % 2 ? part.to : part.from;
-      } else {
-        part = bidi[pos += dir];
-        if (!part) return null;
-        if ((dir > 0) == part.level % 2)
-          target = moveInLine(line, part.to, -1, byUnit);
-        else
-          target = moveInLine(line, part.from, 1, byUnit);
-      }
-    }
-  }
-
-  function moveLogically(line, start, dir, byUnit) {
-    var target = start + dir;
-    if (byUnit) while (target > 0 && isExtendingChar.test(line.text.charAt(target))) target += dir;
-    return target < 0 || target > line.text.length ? null : target;
-  }
-
-  // Bidirectional ordering algorithm
-  // See http://unicode.org/reports/tr9/tr9-13.html for the algorithm
-  // that this (partially) implements.
-
-  // One-char codes used for character types:
-  // L (L):   Left-to-Right
-  // R (R):   Right-to-Left
-  // r (AL):  Right-to-Left Arabic
-  // 1 (EN):  European Number
-  // + (ES):  European Number Separator
-  // % (ET):  European Number Terminator
-  // n (AN):  Arabic Number
-  // , (CS):  Common Number Separator
-  // m (NSM): Non-Spacing Mark
-  // b (BN):  Boundary Neutral
-  // s (B):   Paragraph Separator
-  // t (S):   Segment Separator
-  // w (WS):  Whitespace
-  // N (ON):  Other Neutrals
-
-  // Returns null if characters are ordered as they appear
-  // (left-to-right), or an array of sections ({from, to, level}
-  // objects) in the order in which they occur visually.
-  var bidiOrdering = (function() {
-    // Character types for codepoints 0 to 0xff
-    var lowTypes = "bbbbbbbbbtstwsbbbbbbbbbbbbbbssstwNN%%%NNNNNN,N,N1111111111NNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNbbbbbbsbbbbbbbbbbbbbbbbbbbbbbbbbb,N%%%%NNNNLNNNNN%%11NLNNN1LNNNNNLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLL";
-    // Character types for codepoints 0x600 to 0x6ff
-    var arabicTypes = "rrrrrrrrrrrr,rNNmmmmmmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmrrrrrrrnnnnnnnnnn%nnrrrmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmmmmmNmmmmrrrrrrrrrrrrrrrrrr";
-    function charType(code) {
-      if (code <= 0xff) return lowTypes.charAt(code);
-      else if (0x590 <= code && code <= 0x5f4) return "R";
-      else if (0x600 <= code && code <= 0x6ff) return arabicTypes.charAt(code - 0x600);
-      else if (0x700 <= code && code <= 0x8ac) return "r";
-      else return "L";
-    }
-
-    var bidiRE = /[\u0590-\u05f4\u0600-\u06ff\u0700-\u08ac]/;
-    var isNeutral = /[stwN]/, isStrong = /[LRr]/, countsAsLeft = /[Lb1n]/, countsAsNum = /[1n]/;
-    // Browsers seem to always treat the boundaries of block elements as being L.
-    var outerType = "L";
-
-    return function(str) {
-      if (!bidiRE.test(str)) return false;
-      var len = str.length, types = [];
-      for (var i = 0, type; i < len; ++i)
-        types.push(type = charType(str.charCodeAt(i)));
-
-      // W1. Examine each non-spacing mark (NSM) in the level run, and
-      // change the type of the NSM to the type of the previous
-      // character. If the NSM is at the start of the level run, it will
-      // get the type of sor.
-      for (var i = 0, prev = outerType; i < len; ++i) {
-        var type = types[i];
-        if (type == "m") types[i] = prev;
-        else prev = type;
-      }
-
-      // W2. Search backwards from each instance of a European number
-      // until the first strong type (R, L, AL, or sor) is found. If an
-      // AL is found, change the type of the European number to Arabic
-      // number.
-      // W3. Change all ALs to R.
-      for (var i = 0, cur = outerType; i < len; ++i) {
-        var type = types[i];
-        if (type == "1" && cur == "r") types[i] = "n";
-        else if (isStrong.test(type)) { cur = type; if (type == "r") types[i] = "R"; }
-      }
-
-      // W4. A single European separator between two European numbers
-      // changes to a European number. A single common separator between
-      // two numbers of the same type changes to that type.
-      for (var i = 1, prev = types[0]; i < len - 1; ++i) {
-        var type = types[i];
-        if (type == "+" && prev == "1" && types[i+1] == "1") types[i] = "1";
-        else if (type == "," && prev == types[i+1] &&
-                 (prev == "1" || prev == "n")) types[i] = prev;
-        prev = type;
-      }
-
-      // W5. A sequence of European terminators adjacent to European
-      // numbers changes to all European numbers.
-      // W6. Otherwise, separators and terminators change to Other
-      // Neutral.
-      for (var i = 0; i < len; ++i) {
-        var type = types[i];
-        if (type == ",") types[i] = "N";
-        else if (type == "%") {
-          for (var end = i + 1; end < len && types[end] == "%"; ++end) {}
-          var replace = (i && types[i-1] == "!") || (end < len - 1 && types[end] == "1") ? "1" : "N";
-          for (var j = i; j < end; ++j) types[j] = replace;
-          i = end - 1;
-        }
-      }
-
-      // W7. Search backwards from each instance of a European number
-      // until the first strong type (R, L, or sor) is found. If an L is
-      // found, then change the type of the European number to L.
-      for (var i = 0, cur = outerType; i < len; ++i) {
-        var type = types[i];
-        if (cur == "L" && type == "1") types[i] = "L";
-        else if (isStrong.test(type)) cur = type;
-      }
-
-      // N1. A sequence of neutrals takes the direction of the
-      // surrounding strong text if the text on both sides has the same
-      // direction. European and Arabic numbers act as if they were R in
-      // terms of their influence on neutrals. Start-of-level-run (sor)
-      // and end-of-level-run (eor) are used at level run boundaries.
-      // N2. Any remaining neutrals take the embedding direction.
-      for (var i = 0; i < len; ++i) {
-        if (isNeutral.test(types[i])) {
-          for (var end = i + 1; end < len && isNeutral.test(types[end]); ++end) {}
-          var before = (i ? types[i-1] : outerType) == "L";
-          var after = (end < len - 1 ? types[end] : outerType) == "L";
-          var replace = before || after ? "L" : "R";
-          for (var j = i; j < end; ++j) types[j] = replace;
-          i = end - 1;
-        }
-      }
-
-      // Here we depart from the documented algorithm, in order to avoid
-      // building up an actual levels array. Since there are only three
-      // levels (0, 1, 2) in an implementation that doesn't take
-      // explicit embedding into account, we can build up the order on
-      // the fly, without following the level-based algorithm.
-      var order = [], m;
-      for (var i = 0; i < len;) {
-        if (countsAsLeft.test(types[i])) {
-          var start = i;
-          for (++i; i < len && countsAsLeft.test(types[i]); ++i) {}
-          order.push({from: start, to: i, level: 0});
-        } else {
-          var pos = i, at = order.length;
-          for (++i; i < len && types[i] != "L"; ++i) {}
-          for (var j = pos; j < i;) {
-            if (countsAsNum.test(types[j])) {
-              if (pos < j) order.splice(at, 0, {from: pos, to: j, level: 1});
-              var nstart = j;
-              for (++j; j < i && countsAsNum.test(types[j]); ++j) {}
-              order.splice(at, 0, {from: nstart, to: j, level: 2});
-              pos = j;
-            } else ++j;
-          }
-          if (pos < i) order.splice(at, 0, {from: pos, to: i, level: 1});
-        }
-      }
-      if (order[0].level == 1 && (m = str.match(/^\s+/))) {
-        order[0].from = m[0].length;
-        order.unshift({from: 0, to: m[0].length, level: 0});
-      }
-      if (lst(order).level == 1 && (m = str.match(/\s+$/))) {
-        lst(order).to -= m[0].length;
-        order.push({from: len - m[0].length, to: len, level: 0});
-      }
-      if (order[0].level != lst(order).level)
-        order.push({from: len, to: len, level: order[0].level});
-
-      return order;
-    };
-  })();
-
-  // THE END
-
-  CodeMirror.version = "3.16.0";
-
-  return CodeMirror;
-})();
+})));
\ No newline at end of file
diff --git a/static/lib/codemirror/mode/go/go.js b/static/lib/codemirror/mode/go/go.js
index d1f989f..8896b57 100644
--- a/static/lib/codemirror/mode/go/go.js
+++ b/static/lib/codemirror/mode/go/go.js
@@ -1,183 +1,187 @@
-function goMode(commentsOnly) {
-    return function(config) {
-        var indentUnit = config.indentUnit;
+// CodeMirror, copyright (c) by Marijn Haverbeke and others
+// Distributed under an MIT license: http://codemirror.net/LICENSE
 
-        var keywords = {
-          "break":true, "case":true, "chan":true, "const":true, "continue":true,
-          "default":true, "defer":true, "else":true, "fallthrough":true, "for":true,
-          "func":true, "go":true, "goto":true, "if":true, "import":true,
-          "interface":true, "map":true, "package":true, "range":true, "return":true,
-          "select":true, "struct":true, "switch":true, "type":true, "var":true,
-          "bool":true, "byte":true, "complex64":true, "complex128":true, "error":true,
-          "float32":true, "float64":true, "int8":true, "int16":true, "int32":true,
-          "int64":true, "rune":true, "string":true, "uint8":true, "uint16":true, "uint32":true,
-          "uint64":true, "int":true, "uint":true, "uintptr":true
-        };
+(function(mod) {
+  if (typeof exports == "object" && typeof module == "object") // CommonJS
+    mod(require("../../lib/codemirror"));
+  else if (typeof define == "function" && define.amd) // AMD
+    define(["../../lib/codemirror"], mod);
+  else // Plain browser env
+    mod(CodeMirror);
+})(function(CodeMirror) {
+"use strict";
 
-        var atoms = {
-          "true":true, "false":true, "iota":true, "nil":true, "append":true,
-          "cap":true, "close":true, "complex":true, "copy":true, "delete":true, "imag":true,
-          "len":true, "make":true, "new":true, "panic":true, "print":true,
-          "println":true, "real":true, "recover":true
-        };
+CodeMirror.defineMode("go", function(config) {
+  var indentUnit = config.indentUnit;
 
-        var isOperatorChar = /[+\-*&^%:=<>!|\/]/;
+  var keywords = {
+    "break":true, "case":true, "chan":true, "const":true, "continue":true,
+    "default":true, "defer":true, "else":true, "fallthrough":true, "for":true,
+    "func":true, "go":true, "goto":true, "if":true, "import":true,
+    "interface":true, "map":true, "package":true, "range":true, "return":true,
+    "select":true, "struct":true, "switch":true, "type":true, "var":true,
+    "bool":true, "byte":true, "complex64":true, "complex128":true,
+    "float32":true, "float64":true, "int8":true, "int16":true, "int32":true,
+    "int64":true, "string":true, "uint8":true, "uint16":true, "uint32":true,
+    "uint64":true, "int":true, "uint":true, "uintptr":true, "error": true,
+    "rune":true
+  };
 
-        var curPunc;
+  var atoms = {
+    "true":true, "false":true, "iota":true, "nil":true, "append":true,
+    "cap":true, "close":true, "complex":true, "copy":true, "delete":true, "imag":true,
+    "len":true, "make":true, "new":true, "panic":true, "print":true,
+    "println":true, "real":true, "recover":true
+  };
 
-        function tokenBase(stream, state) {
-            var ch = stream.next();
-            if (ch == '"' || ch == "'" || ch == "`") {
-                state.tokenize = tokenString(ch);
-                return state.tokenize(stream, state);
-            }
-            if (/[\d\.]/.test(ch)) {
-                if (ch == ".") {
-                    stream.match(/^[0-9]+([eE][\-+]?[0-9]+)?/);
-                } else if (ch == "0") {
-                    stream.match(/^[xX][0-9a-fA-F]+/) || stream.match(/^0[0-7]+/);
-                } else {
-                    stream.match(/^[0-9]*\.?[0-9]*([eE][\-+]?[0-9]+)?/);
-                }
-                return "number";
-            }
-            if (/[\[\]{}\(\),;\:\.]/.test(ch)) {
-                curPunc = ch;
-                return null;
-            }
-            if (ch == "/") {
-                if (stream.eat("*")) {
-                    state.tokenize = tokenComment;
-                    return tokenComment(stream, state);
-                }
-                if (stream.eat("/")) {
-                    stream.skipToEnd();
-                    return "comment";
-                }
-            }
-            if (isOperatorChar.test(ch)) {
-                stream.eatWhile(isOperatorChar);
-                return "operator";
-            }
-            stream.eatWhile(/[\w\$_]/);
-            var cur = stream.current();
-            if (keywords.propertyIsEnumerable(cur)) {
-                if (cur == "case" || cur == "default") curPunc = "case";
-                return "keyword";
-            }
-            if (atoms.propertyIsEnumerable(cur)) return "atom";
-            return "variable";
-        }
+  var isOperatorChar = /[+\-*&^%:=<>!|\/]/;
 
-        function tokenString(quote) {
-            return function(stream, state) {
-                var escaped = false,
-                    next, end = false;
-                while ((next = stream.next()) != null) {
-                    if (next == quote && !escaped) {
-                        end = true;
-                        break;
-                    }
-                    escaped = !escaped && next == "\\";
-                }
-                if (end || !(escaped || quote == "`"))
-                    state.tokenize = tokenBase;
-                return "string";
-            };
-        }
+  var curPunc;
 
-        function tokenComment(stream, state) {
-            var maybeEnd = false,
-                ch;
-            while (ch = stream.next()) {
-                if (ch == "/" && maybeEnd) {
-                    state.tokenize = tokenBase;
-                    break;
-                }
-                maybeEnd = (ch == "*");
-            }
-            return "comment";
-        }
-
-        function Context(indented, column, type, align, prev) {
-            this.indented = indented;
-            this.column = column;
-            this.type = type;
-            this.align = align;
-            this.prev = prev;
-        }
-
-        function pushContext(state, col, type) {
-            return state.context = new Context(state.indented, col, type, null, state.context);
-        }
-
-        function popContext(state) {
-            var t = state.context.type;
-            if (t == ")" || t == "]" || t == "}")
-                state.indented = state.context.indented;
-            return state.context = state.context.prev;
-        }
-
-        // Interface
-
-        return {
-            startState: function(basecolumn) {
-                return {
-                    tokenize: null,
-                    context: new Context((basecolumn || 0) - indentUnit, 0, "top", false),
-                    indented: 0,
-                    startOfLine: true
-                };
-            },
-
-            token: function(stream, state) {
-                var ctx = state.context;
-                if (stream.sol()) {
-                    if (ctx.align == null) ctx.align = false;
-                    state.indented = stream.indentation();
-                    state.startOfLine = true;
-                    if (ctx.type == "case") ctx.type = "}";
-                }
-                if (stream.eatSpace()) return null;
-                curPunc = null;
-                var style = (state.tokenize || tokenBase)(stream, state);
-                if (style == "comment") return style;
-                if (ctx.align == null) ctx.align = true;
-
-                if (curPunc == "{") pushContext(state, stream.column(), "}");
-                else if (curPunc == "[") pushContext(state, stream.column(), "]");
-                else if (curPunc == "(") pushContext(state, stream.column(), ")");
-                else if (curPunc == "case") ctx.type = "case";
-                else if (curPunc == "}" && ctx.type == "}") ctx = popContext(state);
-                else if (curPunc == ctx.type) popContext(state);
-                state.startOfLine = false;
-                if (commentsOnly) return "";
-                return style;
-            },
-
-            indent: function(state, textAfter) {
-                if (state.tokenize != tokenBase && state.tokenize != null) return 0;
-                var ctx = state.context,
-                    firstChar = textAfter && textAfter.charAt(0);
-                if (ctx.type == "case" && /^(?:case|default)\b/.test(textAfter)) {
-                    state.context.type = "}";
-                    return ctx.indented;
-                }
-                var closing = firstChar == ctx.type;
-                if (ctx.align) return ctx.column + (closing ? 0 : 1);
-                else return ctx.indented + (closing ? 0 : indentUnit);
-            },
-
-            electricChars: "{}:",
-            blockCommentStart: "/*",
-            blockCommentEnd: "*/",
-            lineComment: "//"
-        };
+  function tokenBase(stream, state) {
+    var ch = stream.next();
+    if (ch == '"' || ch == "'" || ch == "`") {
+      state.tokenize = tokenString(ch);
+      return state.tokenize(stream, state);
     }
-}
+    if (/[\d\.]/.test(ch)) {
+      if (ch == ".") {
+        stream.match(/^[0-9]+([eE][\-+]?[0-9]+)?/);
+      } else if (ch == "0") {
+        stream.match(/^[xX][0-9a-fA-F]+/) || stream.match(/^0[0-7]+/);
+      } else {
+        stream.match(/^[0-9]*\.?[0-9]*([eE][\-+]?[0-9]+)?/);
+      }
+      return "number";
+    }
+    if (/[\[\]{}\(\),;\:\.]/.test(ch)) {
+      curPunc = ch;
+      return null;
+    }
+    if (ch == "/") {
+      if (stream.eat("*")) {
+        state.tokenize = tokenComment;
+        return tokenComment(stream, state);
+      }
+      if (stream.eat("/")) {
+        stream.skipToEnd();
+        return "comment";
+      }
+    }
+    if (isOperatorChar.test(ch)) {
+      stream.eatWhile(isOperatorChar);
+      return "operator";
+    }
+    stream.eatWhile(/[\w\$_\xa1-\uffff]/);
+    var cur = stream.current();
+    if (keywords.propertyIsEnumerable(cur)) {
+      if (cur == "case" || cur == "default") curPunc = "case";
+      return "keyword";
+    }
+    if (atoms.propertyIsEnumerable(cur)) return "atom";
+    return "variable";
+  }
 
-CodeMirror.defineMode("go", goMode(false));
+  function tokenString(quote) {
+    return function(stream, state) {
+      var escaped = false, next, end = false;
+      while ((next = stream.next()) != null) {
+        if (next == quote && !escaped) {end = true; break;}
+        escaped = !escaped && quote != "`" && next == "\\";
+      }
+      if (end || !(escaped || quote == "`"))
+        state.tokenize = tokenBase;
+      return "string";
+    };
+  }
+
+  function tokenComment(stream, state) {
+    var maybeEnd = false, ch;
+    while (ch = stream.next()) {
+      if (ch == "/" && maybeEnd) {
+        state.tokenize = tokenBase;
+        break;
+      }
+      maybeEnd = (ch == "*");
+    }
+    return "comment";
+  }
+
+  function Context(indented, column, type, align, prev) {
+    this.indented = indented;
+    this.column = column;
+    this.type = type;
+    this.align = align;
+    this.prev = prev;
+  }
+  function pushContext(state, col, type) {
+    return state.context = new Context(state.indented, col, type, null, state.context);
+  }
+  function popContext(state) {
+    if (!state.context.prev) return;
+    var t = state.context.type;
+    if (t == ")" || t == "]" || t == "}")
+      state.indented = state.context.indented;
+    return state.context = state.context.prev;
+  }
+
+  // Interface
+
+  return {
+    startState: function(basecolumn) {
+      return {
+        tokenize: null,
+        context: new Context((basecolumn || 0) - indentUnit, 0, "top", false),
+        indented: 0,
+        startOfLine: true
+      };
+    },
+
+    token: function(stream, state) {
+      var ctx = state.context;
+      if (stream.sol()) {
+        if (ctx.align == null) ctx.align = false;
+        state.indented = stream.indentation();
+        state.startOfLine = true;
+        if (ctx.type == "case") ctx.type = "}";
+      }
+      if (stream.eatSpace()) return null;
+      curPunc = null;
+      var style = (state.tokenize || tokenBase)(stream, state);
+      if (style == "comment") return style;
+      if (ctx.align == null) ctx.align = true;
+
+      if (curPunc == "{") pushContext(state, stream.column(), "}");
+      else if (curPunc == "[") pushContext(state, stream.column(), "]");
+      else if (curPunc == "(") pushContext(state, stream.column(), ")");
+      else if (curPunc == "case") ctx.type = "case";
+      else if (curPunc == "}" && ctx.type == "}") ctx = popContext(state);
+      else if (curPunc == ctx.type) popContext(state);
+      state.startOfLine = false;
+      return style;
+    },
+
+    indent: function(state, textAfter) {
+      if (state.tokenize != tokenBase && state.tokenize != null) return 0;
+      var ctx = state.context, firstChar = textAfter && textAfter.charAt(0);
+      if (ctx.type == "case" && /^(?:case|default)\b/.test(textAfter)) {
+        state.context.type = "}";
+        return ctx.indented;
+      }
+      var closing = firstChar == ctx.type;
+      if (ctx.align) return ctx.column + (closing ? 0 : 1);
+      else return ctx.indented + (closing ? 0 : indentUnit);
+    },
+
+    electricChars: "{}):",
+    closeBrackets: "()[]{}''\"\"``",
+    fold: "brace",
+    blockCommentStart: "/*",
+    blockCommentEnd: "*/",
+    lineComment: "//"
+  };
+});
+
 CodeMirror.defineMIME("text/x-go", "go");
 
-CodeMirror.defineMode("goComments", goMode(true));
-CodeMirror.defineMIME("text/x-go-comments", "goComments");
+});