html: add "in template" insertion mode support
See:
https://html.spec.whatwg.org/multipage/parsing.html#parsing-main-intemplate
Updates golang/go#23071
Change-Id: I36529b7cf5d2adf159ed5c471fba9f67890b7eb9
Reviewed-on: https://go-review.googlesource.com/94838
Run-TryBot: Kunpei Sakai <namusyaka@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Nigel Tao <nigeltao@golang.org>
diff --git a/html/node.go b/html/node.go
index 6f136c4..2c1cade 100644
--- a/html/node.go
+++ b/html/node.go
@@ -174,6 +174,16 @@
return -1
}
+// contains returns whether a is within s.
+func (s *nodeStack) contains(a atom.Atom) bool {
+ for _, n := range *s {
+ if n.DataAtom == a {
+ return true
+ }
+ }
+ return false
+}
+
// insert inserts a node at the given index.
func (s *nodeStack) insert(i int, n *Node) {
(*s) = append(*s, nil)
@@ -192,3 +202,19 @@
(*s)[j] = nil
*s = (*s)[:j]
}
+
+type insertionModeStack []insertionMode
+
+func (s *insertionModeStack) pop() (im insertionMode) {
+ i := len(*s)
+ im = (*s)[i-1]
+ *s = (*s)[:i-1]
+ return im
+}
+
+func (s *insertionModeStack) top() insertionMode {
+ if i := len(*s); i > 0 {
+ return (*s)[i-1]
+ }
+ return nil
+}
diff --git a/html/parse.go b/html/parse.go
index 2a5abdd..46c1cc6 100644
--- a/html/parse.go
+++ b/html/parse.go
@@ -32,6 +32,8 @@
head, form *Node
// Other parsing state flags (section 12.2.4.5).
scripting, framesetOK bool
+ // The stack of template insertion modes
+ templateStack insertionModeStack
// im is the current insertion mode.
im insertionMode
// originalIM is the insertion mode to go back to after completing a text
@@ -126,7 +128,7 @@
return -1
}
case tableScope:
- if tagAtom == a.Html || tagAtom == a.Table {
+ if tagAtom == a.Html || tagAtom == a.Table || tagAtom == a.Template {
return -1
}
case selectScope:
@@ -162,17 +164,17 @@
tagAtom := p.oe[i].DataAtom
switch s {
case tableScope:
- if tagAtom == a.Html || tagAtom == a.Table {
+ if tagAtom == a.Html || tagAtom == a.Table || tagAtom == a.Template {
p.oe = p.oe[:i+1]
return
}
case tableRowScope:
- if tagAtom == a.Html || tagAtom == a.Tr {
+ if tagAtom == a.Html || tagAtom == a.Tr || tagAtom == a.Template {
p.oe = p.oe[:i+1]
return
}
case tableBodyScope:
- if tagAtom == a.Html || tagAtom == a.Tbody || tagAtom == a.Tfoot || tagAtom == a.Thead {
+ if tagAtom == a.Html || tagAtom == a.Tbody || tagAtom == a.Tfoot || tagAtom == a.Thead || tagAtom == a.Template {
p.oe = p.oe[:i+1]
return
}
@@ -183,7 +185,7 @@
}
// generateImpliedEndTags pops nodes off the stack of open elements as long as
-// the top node has a tag name of dd, dt, li, option, optgroup, p, rp, or rt.
+// the top node has a tag name of dd, dt, li, optgroup, option, p, rp, or rt.
// If exceptions are specified, nodes with that name will not be popped off.
func (p *parser) generateImpliedEndTags(exceptions ...string) {
var i int
@@ -192,7 +194,9 @@
n := p.oe[i]
if n.Type == ElementNode {
switch n.DataAtom {
- case a.Dd, a.Dt, a.Li, a.Option, a.Optgroup, a.P, a.Rp, a.Rt:
+ // TODO: add a.Rb and a.Rtc, to match the spec. This needs additions to the
+ // atom package. Ditto for generateAllImpliedEndTags.
+ case a.Dd, a.Dt, a.Li, a.Optgroup, a.Option, a.P, a.Rp, a.Rt:
for _, except := range exceptions {
if n.Data == except {
break loop
@@ -207,6 +211,27 @@
p.oe = p.oe[:i+1]
}
+// generateAllImpliedEndTags pops nodes off the stack of open elements as long as
+// the top node has a tag name of caption, colgroup, dd, div, dt, li, optgroup, option, p, rp, rt,
+// span, tbody, td, tfoot, th, thead or tr.
+func (p *parser) generateAllImpliedEndTags() {
+ var i int
+ for i = len(p.oe) - 1; i >= 0; i-- {
+ n := p.oe[i]
+ if n.Type == ElementNode {
+ switch n.DataAtom {
+ // TODO: remove this divergence from the HTML5 spec
+ case a.Caption, a.Colgroup, a.Dd, a.Div, a.Dt, a.Li, a.Optgroup, a.Option, a.P, a.Rp, a.Rt,
+ a.Span, a.Tbody, a.Td, a.Tfoot, a.Th, a.Thead, a.Tr:
+ continue
+ }
+ }
+ break
+ }
+
+ p.oe = p.oe[:i+1]
+}
+
// addChild adds a child node n to the top element, and pushes n onto the stack
// of open elements if it is an element node.
func (p *parser) addChild(n *Node) {
@@ -236,7 +261,7 @@
// fosterParent adds a child node according to the foster parenting rules.
// Section 12.2.6.1, "foster parenting".
func (p *parser) fosterParent(n *Node) {
- var table, parent, prev *Node
+ var table, parent, prev, template *Node
var i int
for i = len(p.oe) - 1; i >= 0; i-- {
if p.oe[i].DataAtom == a.Table {
@@ -245,6 +270,19 @@
}
}
+ var j int
+ for j = len(p.oe) - 1; j >= 0; j-- {
+ if p.oe[j].DataAtom == a.Template {
+ template = p.oe[j]
+ break
+ }
+ }
+
+ if template != nil && (table == nil || j < i) {
+ template.AppendChild(n)
+ return
+ }
+
if table == nil {
// The foster parent is the html element.
parent = p.oe[0]
@@ -415,14 +453,34 @@
func (p *parser) resetInsertionMode() {
for i := len(p.oe) - 1; i >= 0; i-- {
n := p.oe[i]
- if i == 0 && p.context != nil {
+ last := i == 0
+ if last && p.context != nil {
n = p.context
}
switch n.DataAtom {
case a.Select:
+ if !last {
+ for ancestor, first := n, p.oe[0]; ancestor != first; {
+ if ancestor == first {
+ break
+ }
+ ancestor = p.oe[p.oe.index(ancestor)-1]
+ switch ancestor.DataAtom {
+ case a.Template:
+ p.im = inSelectIM
+ return
+ case a.Table:
+ p.im = inSelectInTableIM
+ return
+ }
+ }
+ }
p.im = inSelectIM
case a.Td, a.Th:
+ // TODO: remove this divergence from the HTML5 spec.
+ //
+ // See https://bugs.chromium.org/p/chromium/issues/detail?id=829668
p.im = inCellIM
case a.Tr:
p.im = inRowIM
@@ -434,20 +492,32 @@
p.im = inColumnGroupIM
case a.Table:
p.im = inTableIM
+ case a.Template:
+ p.im = p.templateStack.top()
case a.Head:
- p.im = inBodyIM
+ // TODO: remove this divergence from the HTML5 spec.
+ //
+ // See https://bugs.chromium.org/p/chromium/issues/detail?id=829668
+ p.im = inHeadIM
case a.Body:
p.im = inBodyIM
case a.Frameset:
p.im = inFramesetIM
case a.Html:
- p.im = beforeHeadIM
+ if p.head == nil {
+ p.im = beforeHeadIM
+ } else {
+ p.im = afterHeadIM
+ }
default:
+ if last {
+ p.im = inBodyIM
+ return
+ }
continue
}
return
}
- p.im = inBodyIM
}
const whitespace = " \t\r\n\f"
@@ -590,19 +660,36 @@
case a.Head:
// Ignore the token.
return true
+ case a.Template:
+ p.addElement()
+ p.afe = append(p.afe, &scopeMarker)
+ p.framesetOK = false
+ p.im = inTemplateIM
+ p.templateStack = append(p.templateStack, inTemplateIM)
+ return true
}
case EndTagToken:
switch p.tok.DataAtom {
case a.Head:
- n := p.oe.pop()
- if n.DataAtom != a.Head {
- panic("html: bad parser state: <head> element not found, in the in-head insertion mode")
- }
+ p.oe.pop()
p.im = afterHeadIM
return true
case a.Body, a.Html, a.Br:
p.parseImpliedToken(EndTagToken, a.Head, a.Head.String())
return false
+ case a.Template:
+ if !p.oe.contains(a.Template) {
+ return true
+ }
+ p.generateAllImpliedEndTags()
+ if n := p.oe.top(); n.DataAtom != a.Template {
+ return true
+ }
+ p.popUntil(defaultScope, a.Template)
+ p.clearActiveFormattingElements()
+ p.templateStack.pop()
+ p.resetInsertionMode()
+ return true
default:
// Ignore the token.
return true
@@ -648,7 +735,7 @@
p.addElement()
p.im = inFramesetIM
return true
- case a.Base, a.Basefont, a.Bgsound, a.Link, a.Meta, a.Noframes, a.Script, a.Style, a.Title:
+ case a.Base, a.Basefont, a.Bgsound, a.Link, a.Meta, a.Noframes, a.Script, a.Style, a.Template, a.Title:
p.oe = append(p.oe, p.head)
defer p.oe.remove(p.head)
return inHeadIM(p)
@@ -660,6 +747,8 @@
switch p.tok.DataAtom {
case a.Body, a.Html, a.Br:
// Drop down to creating an implied <body> tag.
+ case a.Template:
+ return inHeadIM(p)
default:
// Ignore the token.
return true
@@ -727,10 +816,16 @@
case StartTagToken:
switch p.tok.DataAtom {
case a.Html:
+ if p.oe.contains(a.Template) {
+ return true
+ }
copyAttributes(p.oe[0], p.tok)
- case a.Base, a.Basefont, a.Bgsound, a.Command, a.Link, a.Meta, a.Noframes, a.Script, a.Style, a.Title:
+ case a.Base, a.Basefont, a.Bgsound, a.Command, a.Link, a.Meta, a.Noframes, a.Script, a.Style, a.Template, a.Title:
return inHeadIM(p)
case a.Body:
+ if p.oe.contains(a.Template) {
+ return true
+ }
if len(p.oe) >= 2 {
body := p.oe[1]
if body.Type == ElementNode && body.DataAtom == a.Body {
@@ -767,7 +862,7 @@
// The newline, if any, will be dealt with by the TextToken case.
p.framesetOK = false
case a.Form:
- if p.form == nil {
+ if p.oe.contains(a.Template) || p.form == nil {
p.popUntil(buttonScope, a.P)
p.addElement()
p.form = p.top()
@@ -972,7 +1067,13 @@
p.acknowledgeSelfClosingTag()
}
return true
- case a.Caption, a.Col, a.Colgroup, a.Frame, a.Head, a.Tbody, a.Td, a.Tfoot, a.Th, a.Thead, a.Tr:
+ case a.Frame:
+ // TODO: remove this divergence from the HTML5 spec.
+ if p.oe.contains(a.Template) {
+ p.addElement()
+ return true
+ }
+ case a.Caption, a.Col, a.Colgroup, a.Head, a.Tbody, a.Td, a.Tfoot, a.Th, a.Thead, a.Tr:
// Ignore the token.
default:
p.reconstructActiveFormattingElements()
@@ -993,15 +1094,28 @@
case a.Address, a.Article, a.Aside, a.Blockquote, a.Button, a.Center, a.Details, a.Dir, a.Div, a.Dl, a.Fieldset, a.Figcaption, a.Figure, a.Footer, a.Header, a.Hgroup, a.Listing, a.Menu, a.Nav, a.Ol, a.Pre, a.Section, a.Summary, a.Ul:
p.popUntil(defaultScope, p.tok.DataAtom)
case a.Form:
- node := p.form
- p.form = nil
- i := p.indexOfElementInScope(defaultScope, a.Form)
- if node == nil || i == -1 || p.oe[i] != node {
- // Ignore the token.
- return true
+ if p.oe.contains(a.Template) {
+ if !p.oe.contains(a.Form) {
+ // Ignore the token.
+ return true
+ }
+ p.generateImpliedEndTags()
+ if p.tok.DataAtom == a.Form {
+ // Ignore the token.
+ return true
+ }
+ p.popUntil(defaultScope, a.Form)
+ } else {
+ node := p.form
+ p.form = nil
+ i := p.indexOfElementInScope(defaultScope, a.Form)
+ if node == nil || i == -1 || p.oe[i] != node {
+ // Ignore the token.
+ return true
+ }
+ p.generateImpliedEndTags()
+ p.oe.remove(node)
}
- p.generateImpliedEndTags()
- p.oe.remove(node)
case a.P:
if !p.elementInScope(buttonScope, a.P) {
p.parseImpliedToken(StartTagToken, a.P, a.P.String())
@@ -1022,6 +1136,8 @@
case a.Br:
p.tok.Type = StartTagToken
return false
+ case a.Template:
+ return inHeadIM(p)
default:
p.inBodyEndTagOther(p.tok.DataAtom)
}
@@ -1030,6 +1146,22 @@
Type: CommentNode,
Data: p.tok.Data,
})
+ case ErrorToken:
+ // TODO: remove this divergence from the HTML5 spec.
+ if len(p.templateStack) > 0 {
+ p.im = inTemplateIM
+ return false
+ } else {
+ for _, e := range p.oe {
+ // TODO(namusyaka): rb and rtc elements should be added after updating atom.
+ switch e.DataAtom {
+ case a.Dd, a.Dt, a.Li, a.Optgroup, a.Option, a.P, a.Rp, a.Rt, a.Tbody, a.Td, a.Tfoot, a.Th,
+ a.Thead, a.Tr, a.Body, a.Html:
+ default:
+ return true
+ }
+ }
+ }
}
return true
@@ -1135,6 +1267,12 @@
switch commonAncestor.DataAtom {
case a.Table, a.Tbody, a.Tfoot, a.Thead, a.Tr:
p.fosterParent(lastNode)
+ case a.Template:
+ // TODO: remove namespace checking
+ if commonAncestor.Namespace == "html" {
+ commonAncestor = commonAncestor.LastChild
+ }
+ fallthrough
default:
commonAncestor.AppendChild(lastNode)
}
@@ -1249,7 +1387,7 @@
}
// Ignore the token.
return true
- case a.Style, a.Script:
+ case a.Style, a.Script, a.Template:
return inHeadIM(p)
case a.Input:
for _, t := range p.tok.Attr {
@@ -1261,7 +1399,7 @@
}
// Otherwise drop down to the default action.
case a.Form:
- if p.form != nil {
+ if p.oe.contains(a.Template) || p.form != nil {
// Ignore the token.
return true
}
@@ -1291,6 +1429,8 @@
case a.Body, a.Caption, a.Col, a.Colgroup, a.Html, a.Tbody, a.Td, a.Tfoot, a.Th, a.Thead, a.Tr:
// Ignore the token.
return true
+ case a.Template:
+ return inHeadIM(p)
}
case CommentToken:
p.addChild(&Node{
@@ -1386,11 +1526,13 @@
p.oe.pop()
p.acknowledgeSelfClosingTag()
return true
+ case a.Template:
+ return inHeadIM(p)
}
case EndTagToken:
switch p.tok.DataAtom {
case a.Colgroup:
- if p.oe.top().DataAtom != a.Html {
+ if p.oe.top().DataAtom == a.Colgroup {
p.oe.pop()
p.im = inTableIM
}
@@ -1398,14 +1540,16 @@
case a.Col:
// Ignore the token.
return true
+ case a.Template:
+ return inHeadIM(p)
}
}
- if p.oe.top().DataAtom != a.Html {
- p.oe.pop()
- p.im = inTableIM
- return false
+ if p.oe.top().DataAtom != a.Colgroup {
+ return true
}
- return true
+ p.oe.pop()
+ p.im = inTableIM
+ return false
}
// Section 12.2.6.4.13.
@@ -1597,7 +1741,7 @@
p.tokenizer.NextIsNotRawText()
// Ignore the token.
return true
- case a.Script:
+ case a.Script, a.Template:
return inHeadIM(p)
}
case EndTagToken:
@@ -1618,6 +1762,8 @@
if p.popUntil(selectScope, a.Select) {
p.resetInsertionMode()
}
+ case a.Template:
+ return inHeadIM(p)
}
case CommentToken:
p.addChild(&Node{
@@ -1650,6 +1796,61 @@
return inSelectIM(p)
}
+// Section 12.2.6.4.18.
+func inTemplateIM(p *parser) bool {
+ switch p.tok.Type {
+ case TextToken, CommentToken, DoctypeToken:
+ return inBodyIM(p)
+ case StartTagToken:
+ switch p.tok.DataAtom {
+ case a.Base, a.Basefont, a.Bgsound, a.Link, a.Meta, a.Noframes, a.Script, a.Style, a.Template, a.Title:
+ return inHeadIM(p)
+ case a.Caption, a.Colgroup, a.Tbody, a.Tfoot, a.Thead:
+ p.templateStack.pop()
+ p.templateStack = append(p.templateStack, inTableIM)
+ p.im = inTableIM
+ return false
+ case a.Col:
+ p.templateStack.pop()
+ p.templateStack = append(p.templateStack, inColumnGroupIM)
+ p.im = inColumnGroupIM
+ return false
+ case a.Tr:
+ p.templateStack.pop()
+ p.templateStack = append(p.templateStack, inTableBodyIM)
+ p.im = inTableBodyIM
+ return false
+ case a.Td, a.Th:
+ p.templateStack.pop()
+ p.templateStack = append(p.templateStack, inRowIM)
+ p.im = inRowIM
+ return false
+ default:
+ p.templateStack.pop()
+ p.templateStack = append(p.templateStack, inBodyIM)
+ p.im = inBodyIM
+ return false
+ }
+ case EndTagToken:
+ switch p.tok.DataAtom {
+ case a.Template:
+ return inHeadIM(p)
+ default:
+ // Ignore the token.
+ return true
+ }
+ }
+ if !p.oe.contains(a.Template) {
+ // Ignore the token.
+ return true
+ }
+ p.popUntil(defaultScope, a.Template)
+ p.clearActiveFormattingElements()
+ p.templateStack.pop()
+ p.resetInsertionMode()
+ return false
+}
+
// Section 12.2.6.4.19.
func afterBodyIM(p *parser) bool {
switch p.tok.Type {
@@ -1720,6 +1921,11 @@
p.acknowledgeSelfClosingTag()
case a.Noframes:
return inHeadIM(p)
+ case a.Template:
+ // TODO: remove this divergence from the HTML5 spec.
+ //
+ // See https://bugs.chromium.org/p/chromium/issues/detail?id=829668
+ return inTemplateIM(p)
}
case EndTagToken:
switch p.tok.DataAtom {
@@ -2064,6 +2270,9 @@
}
p.doc.AppendChild(root)
p.oe = nodeStack{root}
+ if context.DataAtom == a.Template {
+ p.templateStack = append(p.templateStack, inTemplateIM)
+ }
p.resetInsertionMode()
for n := context; n != nil; n = n.Parent {
diff --git a/html/parse_test.go b/html/parse_test.go
index 7e47d11..186f2ad 100644
--- a/html/parse_test.go
+++ b/html/parse_test.go
@@ -125,6 +125,7 @@
func dumpLevel(w io.Writer, n *Node, level int) error {
dumpIndent(w, level)
+ level++
switch n.Type {
case ErrorNode:
return errors.New("unexpected ErrorNode")
@@ -140,13 +141,19 @@
sort.Sort(attr)
for _, a := range attr {
io.WriteString(w, "\n")
- dumpIndent(w, level+1)
+ dumpIndent(w, level)
if a.Namespace != "" {
fmt.Fprintf(w, `%s %s="%s"`, a.Namespace, a.Key, a.Val)
} else {
fmt.Fprintf(w, `%s="%s"`, a.Key, a.Val)
}
}
+ if n.Namespace == "" && n.DataAtom == atom.Template {
+ io.WriteString(w, "\n")
+ dumpIndent(w, level)
+ level++
+ io.WriteString(w, "content")
+ }
case TextNode:
fmt.Fprintf(w, `"%s"`, n.Data)
case CommentNode:
@@ -176,7 +183,7 @@
}
io.WriteString(w, "\n")
for c := n.FirstChild; c != nil; c = c.NextSibling {
- if err := dumpLevel(w, c, level+1); err != nil {
+ if err := dumpLevel(w, c, level); err != nil {
return err
}
}
diff --git a/html/testdata/webkit/template.dat b/html/testdata/webkit/template.dat
new file mode 100644
index 0000000..e25f690
--- /dev/null
+++ b/html/testdata/webkit/template.dat
@@ -0,0 +1,1117 @@
+#data
+<body><template>Hello</template>
+#errors
+#document
+| <html>
+| <head>
+| <body>
+| <template>
+| content
+| "Hello"
+
+#data
+<template>Hello</template>
+#errors
+#document
+| <html>
+| <head>
+| <template>
+| content
+| "Hello"
+| <body>
+
+#data
+<template></template><div></div>
+#errors
+#document
+| <html>
+| <head>
+| <template>
+| content
+| <body>
+| <div>
+
+#data
+<html><template>Hello</template>
+#errors
+#document
+| <html>
+| <head>
+| <template>
+| content
+| "Hello"
+| <body>
+
+#data
+<head><template><div></div></template></head>
+#errors
+#document
+| <html>
+| <head>
+| <template>
+| content
+| <div>
+| <body>
+
+#data
+<div><template><div><span></template><b>
+#errors
+#document
+| <html>
+| <head>
+| <body>
+| <div>
+| <template>
+| content
+| <div>
+| <span>
+| <b>
+
+#data
+<div><template></div>Hello
+#errors
+#document
+| <html>
+| <head>
+| <body>
+| <div>
+| <template>
+| content
+| "Hello"
+
+#data
+<div></template></div>
+#errors
+#document
+| <html>
+| <head>
+| <body>
+| <div>
+
+#data
+<table><template></template></table>
+#errors
+#document
+| <html>
+| <head>
+| <body>
+| <table>
+| <template>
+| content
+
+#data
+<table><template></template></div>
+#errors
+#document
+| <html>
+| <head>
+| <body>
+| <table>
+| <template>
+| content
+
+#data
+<table><div><template></template></div>
+#errors
+#document
+| <html>
+| <head>
+| <body>
+| <div>
+| <template>
+| content
+| <table>
+
+#data
+<table><template></template><div></div>
+#errors
+#document
+| <html>
+| <head>
+| <body>
+| <div>
+| <table>
+| <template>
+| content
+
+#data
+<table> <template></template></table>
+#errors
+#document
+| <html>
+| <head>
+| <body>
+| <table>
+| " "
+| <template>
+| content
+
+#data
+<table><tbody><template></template></tbody>
+#errors
+#document
+| <html>
+| <head>
+| <body>
+| <table>
+| <tbody>
+| <template>
+| content
+
+#data
+<table><tbody><template></tbody></template>
+#errors
+#document
+| <html>
+| <head>
+| <body>
+| <table>
+| <tbody>
+| <template>
+| content
+
+#data
+<table><tbody><template></template></tbody></table>
+#errors
+#document
+| <html>
+| <head>
+| <body>
+| <table>
+| <tbody>
+| <template>
+| content
+
+#data
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