blob: e0016c16701a0df2fcb7f2956ca6d4ef23410253 [file] [log] [blame]
{
"version": 3,
"sources": ["../shared/header/header.ts", "../shared/carousel/carousel.ts", "../shared/clipboard/clipboard.ts", "../shared/tooltip/tooltip.ts", "../shared/outline/select.ts", "../shared/modal/modal.ts", "../shared/analytics/analytics.ts", "../shared/keyboard/keyboard.ts", "../shared/jump/jump.ts", "frontend.ts"],
"sourcesContent": ["/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nexport function registerHeaderListeners(): void {\n const header = document.querySelector('.js-header') as HTMLElement;\n\n // Desktop menu hover state\n const menuItemHovers = document.querySelectorAll('.js-desktop-menu-hover');\n menuItemHovers.forEach(menuItemHover => {\n // when user clicks on the dropdown menu item on desktop or mobile,\n // force the menu to stay open until the user clicks off of it.\n menuItemHover.addEventListener('mouseenter', e => {\n const target = e.target as HTMLElement;\n const forced = document.querySelector('.forced-open') as HTMLElement;\n if (forced && forced !== menuItemHover) {\n forced.blur();\n forced.classList.remove('forced-open');\n }\n // prevents menus that have been tabbed into from staying open\n // when you hover over another menu\n target.focus();\n target.blur();\n });\n\n const toggleForcedOpen = (e: Event) => {\n const target = e.target as HTMLElement;\n const isForced = target?.classList.contains('forced-open');\n const currentTarget = e.currentTarget as HTMLElement;\n if (isForced) {\n currentTarget.removeEventListener('blur', () =>\n currentTarget.classList.remove('forced-open')\n );\n currentTarget.classList.remove('forced-open');\n currentTarget.classList.add('forced-closed');\n currentTarget.blur();\n currentTarget?.parentNode?.addEventListener('mouseout', () => {\n currentTarget.classList.remove('forced-closed');\n });\n } else {\n currentTarget.classList.remove('forced-closed');\n currentTarget.classList.add('forced-open');\n currentTarget.focus();\n currentTarget.addEventListener('blur', () => currentTarget.classList.remove('forced-open'));\n currentTarget?.parentNode?.removeEventListener('mouseout', () => {\n currentTarget.classList.remove('forced-closed');\n });\n }\n };\n menuItemHover.addEventListener('click', toggleForcedOpen);\n });\n\n // ensure desktop submenus are closed when esc is pressed\n const headerItems = document.querySelectorAll('.Header-menuItem');\n headerItems.forEach(header => {\n header.addEventListener('keyup', e => {\n const event = e as KeyboardEvent;\n if (event.key === 'Escape') {\n (event.target as HTMLElement)?.blur();\n }\n });\n });\n\n // Mobile menu subnav menus\n const headerbuttons = document.querySelectorAll('.js-headerMenuButton');\n headerbuttons.forEach(button => {\n button.addEventListener('click', e => {\n e.preventDefault();\n const isActive = header?.classList.contains('is-active');\n if (isActive) {\n handleNavigationDrawerInactive(header);\n } else {\n handleNavigationDrawerActive(header);\n }\n button.setAttribute('aria-expanded', isActive ? 'true' : 'false');\n });\n });\n\n const scrim = document.querySelector('.js-scrim');\n scrim?.addEventListener('click', e => {\n e.preventDefault();\n\n // find any active submenus and close them\n const activeSubnavs = document.querySelectorAll('.go-NavigationDrawer-submenuItem.is-active');\n activeSubnavs.forEach(subnav => handleNavigationDrawerInactive(subnav as HTMLElement));\n\n handleNavigationDrawerInactive(header);\n\n headerbuttons.forEach(button => {\n button.setAttribute(\n 'aria-expanded',\n header?.classList.contains('is-active') ? 'true' : 'false'\n );\n });\n });\n\n const getNavigationDrawerMenuItems = (navigationDrawer: HTMLElement): HTMLElement[] => {\n if (!navigationDrawer) {\n return [];\n }\n\n const menuItems = Array.from(\n navigationDrawer.querySelectorAll(\n ':scope > .go-NavigationDrawer-nav > .go-NavigationDrawer-list > .go-NavigationDrawer-listItem > a, :scope > .go-NavigationDrawer-nav > .go-NavigationDrawer-list > .go-NavigationDrawer-listItem > .go-Header-socialIcons > a'\n ) || []\n );\n\n const anchorEl = navigationDrawer.querySelector('.go-NavigationDrawer-header > a');\n if (anchorEl) {\n menuItems.unshift(anchorEl);\n }\n return menuItems as HTMLElement[];\n };\n\n const getNavigationDrawerIsSubnav = (navigationDrawer: HTMLElement) => {\n if (!navigationDrawer) {\n return;\n }\n return navigationDrawer.classList.contains('go-NavigationDrawer-submenuItem');\n };\n\n const handleNavigationDrawerInactive = (navigationDrawer: HTMLElement) => {\n if (!navigationDrawer) {\n return;\n }\n const menuItems = getNavigationDrawerMenuItems(navigationDrawer);\n navigationDrawer.classList.remove('is-active');\n const parentMenuItem = navigationDrawer\n .closest('.go-NavigationDrawer-listItem')\n ?.querySelector(':scope > a') as HTMLElement;\n parentMenuItem?.focus();\n menuItems?.forEach(item => item?.setAttribute('tabindex', '-1'));\n if (menuItems && menuItems[0]) {\n menuItems[0].removeEventListener('keydown', handleMenuItemTabLeftFactory(navigationDrawer));\n menuItems[menuItems.length - 1].removeEventListener(\n 'keydown',\n handleMenuItemTabRightFactory(navigationDrawer)\n );\n }\n\n if (navigationDrawer === header) {\n headerbuttons && (headerbuttons[0] as HTMLElement)?.focus();\n }\n };\n\n const handleNavigationDrawerActive = (navigationDrawer: HTMLElement) => {\n const menuItems = getNavigationDrawerMenuItems(navigationDrawer);\n\n navigationDrawer.classList.add('is-active');\n menuItems.forEach(item => item.setAttribute('tabindex', '0'));\n menuItems[0].focus();\n\n menuItems[0].addEventListener('keydown', handleMenuItemTabLeftFactory(navigationDrawer));\n menuItems[menuItems.length - 1].addEventListener(\n 'keydown',\n handleMenuItemTabRightFactory(navigationDrawer)\n );\n };\n\n const handleMenuItemTabLeftFactory = (navigationDrawer: HTMLElement) => {\n return (e: KeyboardEvent) => {\n if (e.key === 'Tab' && e.shiftKey) {\n e.preventDefault();\n handleNavigationDrawerInactive(navigationDrawer);\n }\n };\n };\n\n const handleMenuItemTabRightFactory = (navigationDrawer: HTMLElement) => {\n return (e: KeyboardEvent) => {\n if (e.key === 'Tab' && !e.shiftKey) {\n e.preventDefault();\n handleNavigationDrawerInactive(navigationDrawer);\n }\n };\n };\n\n const prepMobileNavigationDrawer = (navigationDrawer: HTMLElement) => {\n const isSubnav = getNavigationDrawerIsSubnav(navigationDrawer);\n const menuItems = getNavigationDrawerMenuItems(navigationDrawer);\n navigationDrawer.addEventListener('keyup', e => {\n if (e.key === 'Escape') {\n handleNavigationDrawerInactive(navigationDrawer);\n }\n });\n\n menuItems.forEach(item => {\n const parentLi = item.closest('li');\n if (parentLi && parentLi.classList.contains('js-mobile-subnav-trigger')) {\n const submenu = parentLi.querySelector('.go-NavigationDrawer-submenuItem') as HTMLElement;\n item.addEventListener('click', () => {\n handleNavigationDrawerActive(submenu);\n });\n }\n });\n if (isSubnav) {\n handleNavigationDrawerInactive(navigationDrawer);\n navigationDrawer\n ?.querySelector('.go-NavigationDrawer-header')\n ?.addEventListener('click', e => {\n e.preventDefault();\n handleNavigationDrawerInactive(navigationDrawer);\n });\n }\n };\n\n document\n .querySelectorAll('.go-NavigationDrawer')\n .forEach(drawer => prepMobileNavigationDrawer(drawer as HTMLElement));\n\n handleNavigationDrawerInactive(header);\n}\n\nexport function registerSearchFormListeners(): void {\n const searchForm = document.querySelector('.js-searchForm');\n const expandSearch = document.querySelector('.js-expandSearch');\n const input = searchForm?.querySelector('input');\n const headerLogo = document.querySelector('.js-headerLogo');\n const menuButton = document.querySelector('.js-headerMenuButton');\n expandSearch?.addEventListener('click', () => {\n searchForm?.classList.add('go-SearchForm--expanded');\n headerLogo?.classList.add('go-Header-logo--hidden');\n menuButton?.classList.add('go-Header-navOpen--hidden');\n input?.focus();\n });\n document?.addEventListener('click', e => {\n if (!searchForm?.contains(e.target as Node)) {\n searchForm?.classList.remove('go-SearchForm--expanded');\n headerLogo?.classList.remove('go-Header-logo--hidden');\n menuButton?.classList.remove('go-Header-navOpen--hidden');\n }\n });\n}\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n/**\n * Carousel Controller adds event listeners, accessibility enhancements, and\n * control elements to a carousel component.\n */\nexport class CarouselController {\n /**\n * slides is a collection of slides in the carousel.\n */\n private slides: HTMLLIElement[];\n /**\n * dots is a collection of dot navigation controls, added to the carousel\n * by this controller.\n */\n private dots: HTMLElement[];\n /**\n * liveRegion is a visually hidden element that notifies assitive devices\n * of visual changes to the carousel. They are added to the carousel by\n * this controller.\n */\n private liveRegion: HTMLElement;\n /**\n * activeIndex is the 0-index of the currently active slide.\n */\n private activeIndex: number;\n\n constructor(private el: HTMLElement) {\n this.slides = Array.from(el.querySelectorAll('.go-Carousel-slide'));\n this.dots = [];\n this.liveRegion = document.createElement('div');\n this.activeIndex = Number(el.getAttribute('data-slide-index') ?? 0);\n\n this.initSlides();\n this.initArrows();\n this.initDots();\n this.initLiveRegion();\n }\n\n private initSlides() {\n for (const [i, v] of this.slides.entries()) {\n if (i === this.activeIndex) continue;\n v.setAttribute('aria-hidden', 'true');\n }\n }\n\n private initArrows() {\n const arrows = document.createElement('ul');\n arrows.classList.add('go-Carousel-arrows');\n arrows.innerHTML = `\n <li>\n <button class=\"go-Carousel-prevSlide\" aria-label=\"Go to previous slide\">\n <img class=\"go-Icon\" height=\"24\" width=\"24\" src=\"/static/shared/icon/arrow_left_gm_grey_24dp.svg\" alt=\"\">\n </button>\n </li>\n <li>\n <button class=\"go-Carousel-nextSlide\" aria-label=\"Go to next slide\">\n <img class=\"go-Icon\" height=\"24\" width=\"24\" src=\"/static/shared/icon/arrow_right_gm_grey_24dp.svg\" alt=\"\">\n </button>\n </li>\n `;\n arrows\n .querySelector('.go-Carousel-prevSlide')\n ?.addEventListener('click', () => this.setActive(this.activeIndex - 1));\n arrows\n .querySelector('.go-Carousel-nextSlide')\n ?.addEventListener('click', () => this.setActive(this.activeIndex + 1));\n this.el.append(arrows);\n }\n\n private initDots() {\n const dots = document.createElement('ul');\n dots.classList.add('go-Carousel-dots');\n for (let i = 0; i < this.slides.length; i++) {\n const li = document.createElement('li');\n const button = document.createElement('button');\n button.classList.add('go-Carousel-dot');\n if (i === this.activeIndex) {\n button.classList.add('go-Carousel-dot--active');\n }\n button.innerHTML = `<span class=\"go-Carousel-obscured\">Slide ${i + 1}</span>`;\n button.addEventListener('click', () => this.setActive(i));\n li.append(button);\n dots.append(li);\n this.dots.push(button);\n }\n this.el.append(dots);\n }\n\n private initLiveRegion() {\n this.liveRegion.setAttribute('aria-live', 'polite');\n this.liveRegion.setAttribute('aria-atomic', 'true');\n this.liveRegion.setAttribute('class', 'go-Carousel-obscured');\n this.liveRegion.textContent = `Slide ${this.activeIndex + 1} of ${this.slides.length}`;\n this.el.appendChild(this.liveRegion);\n }\n\n private setActive = (index: number) => {\n this.activeIndex = (index + this.slides.length) % this.slides.length;\n this.el.setAttribute('data-slide-index', String(this.activeIndex));\n for (const d of this.dots) {\n d.classList.remove('go-Carousel-dot--active');\n }\n this.dots[this.activeIndex].classList.add('go-Carousel-dot--active');\n for (const s of this.slides) {\n s.setAttribute('aria-hidden', 'true');\n }\n this.slides[this.activeIndex].removeAttribute('aria-hidden');\n this.liveRegion.textContent = 'Slide ' + (this.activeIndex + 1) + ' of ' + this.slides.length;\n };\n}\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n/**\n * This class decorates an element to copy arbitrary data attached via a data-\n * attribute to the clipboard.\n */\nexport class ClipboardController {\n /**\n * The data to be copied to the clipboard.\n */\n private data: string;\n\n /**\n * @param el The element that will trigger copying text to the clipboard. The text is\n * expected to be within its data-to-copy attribute.\n */\n constructor(private el: HTMLButtonElement) {\n this.data = el.dataset['toCopy'] ?? el.innerText;\n // if data-to-copy is empty and the button is part of an input group\n // capture the value of the input.\n if (!this.data && el.parentElement?.classList.contains('go-InputGroup')) {\n this.data = (this.data || el.parentElement?.querySelector('input')?.value) ?? '';\n }\n el.addEventListener('click', e => this.handleCopyClick(e));\n }\n\n /**\n * Handles when the primary element is clicked.\n */\n handleCopyClick(e: MouseEvent): void {\n e.preventDefault();\n const TOOLTIP_SHOW_DURATION_MS = 1000;\n\n // This API is not available on iOS.\n if (!navigator.clipboard) {\n this.showTooltipText('Unable to copy', TOOLTIP_SHOW_DURATION_MS);\n return;\n }\n navigator.clipboard\n .writeText(this.data)\n .then(() => {\n this.showTooltipText('Copied!', TOOLTIP_SHOW_DURATION_MS);\n })\n .catch(() => {\n this.showTooltipText('Unable to copy', TOOLTIP_SHOW_DURATION_MS);\n });\n }\n\n /**\n * Shows the given text in a tooltip for a specified amount of time, in milliseconds.\n */\n showTooltipText(text: string, durationMs: number): void {\n this.el.setAttribute('data-tooltip', text);\n setTimeout(() => this.el.setAttribute('data-tooltip', ''), durationMs);\n }\n}\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n/**\n * ToolTipController handles closing tooltips on external clicks.\n */\nexport class ToolTipController {\n constructor(private el: HTMLDetailsElement) {\n document.addEventListener('click', e => {\n const insideTooltip = this.el.contains(e.target as Element);\n if (!insideTooltip) {\n this.el.removeAttribute('open');\n }\n });\n }\n}\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nimport { TreeNavController } from './tree.js';\n\nexport class SelectNavController {\n constructor(private el: Element) {\n this.el.addEventListener('change', e => {\n const target = e.target as HTMLSelectElement;\n let href = target.value;\n if (!target.value.startsWith('/')) {\n href = '/' + href;\n }\n window.location.href = href;\n });\n }\n}\n\nexport function makeSelectNav(tree: TreeNavController): HTMLLabelElement {\n const label = document.createElement('label');\n label.classList.add('go-Label');\n label.setAttribute('aria-label', 'Menu');\n const select = document.createElement('select');\n select.classList.add('go-Select', 'js-selectNav');\n label.appendChild(select);\n const outline = document.createElement('optgroup');\n outline.label = 'Outline';\n select.appendChild(outline);\n const groupMap: Record<string, HTMLOptGroupElement> = {};\n let group: HTMLOptGroupElement;\n for (const t of tree.treeitems) {\n if (Number(t.depth) > 4) continue;\n if (t.groupTreeitem) {\n group = groupMap[t.groupTreeitem.label];\n if (!group) {\n group = groupMap[t.groupTreeitem.label] = document.createElement('optgroup');\n group.label = t.groupTreeitem.label;\n select.appendChild(group);\n }\n } else {\n group = outline;\n }\n const o = document.createElement('option');\n o.label = t.label;\n o.textContent = t.label;\n o.value = (t.el as HTMLAnchorElement).href.replace(window.location.origin, '').replace('/', '');\n group.appendChild(o);\n }\n tree.addObserver(t => {\n const hash = (t.el as HTMLAnchorElement).hash;\n const value = select.querySelector<HTMLOptionElement>(`[value$=\"${hash}\"]`)?.value;\n if (value) {\n select.value = value;\n }\n }, 50);\n return label;\n}\n", "/**\n * @license\n * Copyright 2021 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\ninterface Window {\n dialogPolyfill?: {\n registerDialog: (el: HTMLDialogElement) => void;\n };\n}\n\ndeclare const window: Window;\n\n/**\n * ModalController registers a dialog element with the polyfill if\n * necessary for the current browser, add adds event listeners to\n * close and open modals.\n */\nexport class ModalController {\n constructor(private el: HTMLDialogElement) {\n if (window.dialogPolyfill) {\n window.dialogPolyfill.registerDialog(el);\n }\n this.init();\n }\n\n init() {\n const button = document.querySelector<HTMLButtonElement>(`[aria-controls=\"${this.el.id}\"]`);\n if (button) {\n button.addEventListener('click', () => {\n if (this.el.showModal) {\n this.el.showModal();\n } else {\n this.el.setAttribute('opened', 'true');\n }\n this.el.querySelector('input')?.focus();\n });\n }\n for (const btn of this.el.querySelectorAll<HTMLButtonElement>('[data-modal-close]')) {\n btn.addEventListener('click', () => {\n if (this.el.close) {\n this.el.close();\n } else {\n this.el.removeAttribute('opened');\n }\n });\n }\n }\n}\n", "interface TagManagerEvent {\n /**\n * event is the name of the event, used to filter events in\n * Google Analytics.\n */\n event: string;\n\n /**\n * event_category is a name that you supply as a way to group objects\n * that to analyze. Typically, you will use the same category name\n * multiple times over related UI elements (buttons, links, etc).\n */\n event_category?: string;\n\n /**\n * event_action is used to name the type of event or interaction you\n * want to measure for a particular web object. For example, with a\n * single \"form\" category, you can analyze a number of specific events\n * with this parameter, such as: form entered, form submitted.\n */\n event_action?: string;\n\n /**\n * event_label provide additional information for events that you want\n * to analyze, such as the text label of a link.\n */\n event_label?: string;\n\n /**\n * gtm.start is used to initialize Google Tag Manager.\n */\n 'gtm.start'?: number;\n}\n\n// eslint-disable-next-line @typescript-eslint/no-unused-vars\ndeclare global {\n interface Window {\n dataLayer?: (TagManagerEvent | VoidFunction)[];\n ga?: unknown;\n }\n}\n\n/**\n * track sends events to Google Tag Manager.\n */\nexport function track(\n event: string | TagManagerEvent,\n category?: string,\n action?: string,\n label?: string\n): void {\n window.dataLayer ??= [];\n if (typeof event === 'string') {\n window.dataLayer.push({\n event,\n event_category: category,\n event_action: action,\n event_label: label,\n });\n } else {\n window.dataLayer.push(event);\n }\n}\n\n/**\n * func adds functions to run sequentionally after\n * Google Tag Manager is ready.\n */\nexport function func(fn: () => void): void {\n window.dataLayer ??= [];\n window.dataLayer.push(fn);\n}\n", "/*!\n * @license\n * Copyright 2019-2020 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nimport { track } from '../analytics/analytics';\n\n/**\n * Options are keyhandler callback options.\n */\ninterface Options {\n /**\n * target is the element the key event should filter on. The\n * default target is the document.\n */\n target?: Element;\n\n /**\n * withMeta specifies if the event callback should fire when\n * the key is pressed with a meta key (ctrl, alt, etc). By\n * default meta keypresses are ignored.\n */\n withMeta?: boolean;\n}\n\n/**\n * KeyHandler is the config for a keyboard event callback.\n */\ninterface KeyHandler extends Options {\n description: string;\n callback: (e: KeyboardEvent) => void;\n}\n\n/**\n * KeyboardController controls event callbacks for sitewide\n * keyboard events. Multiple callbacks can be registered for\n * a single key and by default the controller ignores events\n * for text input targets.\n */\nclass KeyboardController {\n handlers: Record<string, Set<KeyHandler>>;\n\n constructor() {\n this.handlers = {};\n document.addEventListener('keydown', e => this.handleKeyPress(e));\n }\n\n /**\n * on registers keyboard event callbacks.\n * @param key the key to register.\n * @param description name of the event.\n * @param callback event callback.\n * @param options set target and withMeta options to override the default behaviors.\n */\n on(key: string, description: string, callback: (e: KeyboardEvent) => void, options?: Options) {\n this.handlers[key] ??= new Set();\n this.handlers[key].add({ description, callback, ...options });\n return this;\n }\n\n private handleKeyPress(e: KeyboardEvent) {\n for (const handler of this.handlers[e.key.toLowerCase()] ?? new Set()) {\n if (handler.target && handler.target !== e.target) {\n return;\n }\n const t = e.target as HTMLElement | null;\n if (\n !handler.target &&\n (t?.tagName === 'INPUT' || t?.tagName === 'SELECT' || t?.tagName === 'TEXTAREA')\n ) {\n return;\n }\n if (t?.isContentEditable) {\n return;\n }\n if (\n (handler.withMeta && !(e.ctrlKey || e.metaKey)) ||\n (!handler.withMeta && (e.ctrlKey || e.metaKey))\n ) {\n return;\n }\n track('keypress', 'hotkeys', `${e.key} pressed`, handler.description);\n handler.callback(e);\n }\n }\n}\n\nexport const keyboard = new KeyboardController();\n", "/*!\n * @license\n * Copyright 2019-2020 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n// This file implements the behavior of the \"jump to symbol\" dialog for Go\n// package documentation, as well as the simple dialog that displays keyboard\n// shortcuts.\n\n// The DOM for the dialogs is at the bottom of static/frontend/unit/main/_modals.tmpl.\n// The CSS is in static/frontend/unit/main/_modals.css.\n\n// The dialog is activated by pressing the 'f' key. It presents a list\n// (#JumpDialog-list) of all Go symbols displayed in the documentation.\n// Entering text in the dialog's text box (#JumpDialog-filter) restricts the\n// list to symbols containing the text. Clicking on an symbol jumps to\n// its documentation.\n\n// This code is based on\n// https://go.googlesource.com/gddo/+/refs/heads/master/gddo-server/assets/site.js.\n// It was modified to remove the dependence on jquery and bootstrap.\n\nimport { keyboard } from '../keyboard/keyboard';\n\nexport function initModals(): void {\n const jumpDialog = document.querySelector<HTMLDialogElement>('.JumpDialog');\n const jumpBody = jumpDialog?.querySelector<HTMLDivElement>('.JumpDialog-body');\n const jumpList = jumpDialog?.querySelector<HTMLDivElement>('.JumpDialog-list');\n const jumpFilter = jumpDialog?.querySelector<HTMLInputElement>('.JumpDialog-input');\n const doc = document.querySelector<HTMLDivElement>('.js-documentation');\n\n interface JumpListItem {\n link: HTMLAnchorElement;\n name: string;\n kind: string;\n lower: string;\n }\n\n let jumpListItems: JumpListItem[] | undefined; // All the symbols in the doc; computed only once.\n\n // collectJumpListItems returns a list of items, one for each symbol in the\n // documentation on the current page.\n //\n // It uses the data-kind attribute generated in the documentation HTML to find\n // the symbols and their id attributes.\n //\n // If there are no data-kind attributes, then we have older doc; fall back to\n // a less precise method.\n function collectJumpListItems() {\n const items = [];\n if (!doc) return;\n for (const el of doc.querySelectorAll('[data-kind]')) {\n items.push(newJumpListItem(el));\n }\n\n // Clicking on any of the links closes the dialog.\n for (const item of items) {\n item.link.addEventListener('click', function () {\n jumpDialog?.close();\n });\n }\n // Sort case-insensitively by symbol name.\n items.sort(function (a, b) {\n return a.lower.localeCompare(b.lower);\n });\n return items;\n }\n\n // newJumpListItem creates a new item for the DOM element el.\n // An item is an object with:\n // - name: the element's id (which is the symbol name)\n // - kind: the element's kind (function, variable, etc.),\n // - link: a link ('a' tag) to the element\n // - lower: the name in lower case, just for sorting\n function newJumpListItem(el: Element): JumpListItem {\n const a = document.createElement('a');\n const name = el.getAttribute('id');\n a.setAttribute('href', '#' + name);\n a.setAttribute('tabindex', '-1');\n a.setAttribute('data-gtmc', 'jump to link');\n const kind = el.getAttribute('data-kind');\n return {\n link: a,\n name: name ?? '',\n kind: kind ?? '',\n lower: name?.toLowerCase() ?? '', // for sorting\n };\n }\n\n let lastFilterValue: string; // The last contents of the filter text box.\n let activeJumpItem = -1; // The index of the currently active item in the list.\n\n // updateJumpList sets the elements of the dialog list to\n // everything whose name contains filter.\n function updateJumpList(filter: string) {\n lastFilterValue = filter;\n if (!jumpListItems) {\n jumpListItems = collectJumpListItems();\n }\n setActiveJumpItem(-1);\n\n // Remove all children from list.\n while (jumpList?.firstChild) {\n jumpList.firstChild.remove();\n }\n\n if (filter) {\n // A filter is set. We treat the filter as a substring that can appear in\n // an item name (case insensitive), and find the following matches - in\n // order of priority:\n //\n // 1. Exact matches (the filter matches the item's name exactly)\n // 2. Prefix matches (the item's name starts with filter)\n // 3. Infix matches (the filter is a substring of the item's name)\n const filterLowerCase = filter.toLowerCase();\n\n const exactMatches = [];\n const prefixMatches = [];\n const infixMatches = [];\n\n // makeLinkHtml creates the link name HTML for a list item. item is the DOM\n // item. item.name.substr(boldStart, boldEnd) will be bolded.\n const makeLinkHtml = (item: JumpListItem, boldStart: number, boldEnd: number) => {\n return (\n item.name.substring(0, boldStart) +\n '<b>' +\n item.name.substring(boldStart, boldEnd) +\n '</b>' +\n item.name.substring(boldEnd)\n );\n };\n\n for (const item of jumpListItems ?? []) {\n const nameLowerCase = item.name.toLowerCase();\n\n if (nameLowerCase === filterLowerCase) {\n item.link.innerHTML = makeLinkHtml(item, 0, item.name.length);\n exactMatches.push(item);\n } else if (nameLowerCase.startsWith(filterLowerCase)) {\n item.link.innerHTML = makeLinkHtml(item, 0, filter.length);\n prefixMatches.push(item);\n } else {\n const index = nameLowerCase.indexOf(filterLowerCase);\n if (index > -1) {\n item.link.innerHTML = makeLinkHtml(item, index, index + filter.length);\n infixMatches.push(item);\n }\n }\n }\n\n for (const item of exactMatches.concat(prefixMatches).concat(infixMatches)) {\n jumpList?.appendChild(item.link);\n }\n } else {\n if (!jumpListItems || jumpListItems.length === 0) {\n const msg = document.createElement('i');\n msg.innerHTML = 'There are no symbols on this page.';\n jumpList?.appendChild(msg);\n }\n // No filter set; display all items in their existing order.\n for (const item of jumpListItems ?? []) {\n item.link.innerHTML = item.name + ' <i>' + item.kind + '</i>';\n jumpList?.appendChild(item.link);\n }\n }\n\n if (jumpBody) {\n jumpBody.scrollTop = 0;\n }\n if (jumpListItems?.length && jumpList && jumpList.children.length > 0) {\n setActiveJumpItem(0);\n }\n }\n\n // Set the active jump item to n.\n function setActiveJumpItem(n: number) {\n const cs = jumpList?.children as HTMLCollectionOf<HTMLElement> | null | undefined;\n if (!cs || !jumpBody) {\n return;\n }\n if (activeJumpItem >= 0) {\n cs[activeJumpItem].classList.remove('JumpDialog-active');\n }\n if (n >= cs.length) {\n n = cs.length - 1;\n }\n if (n >= 0) {\n cs[n].classList.add('JumpDialog-active');\n\n // Scroll so the active item is visible.\n // For some reason cs[n].scrollIntoView() doesn't behave as I'd expect:\n // it moves the entire dialog box in the viewport.\n\n // Get the top and bottom of the active item relative to jumpBody.\n const activeTop = cs[n].offsetTop - cs[0].offsetTop;\n const activeBottom = activeTop + cs[n].clientHeight;\n if (activeTop < jumpBody.scrollTop) {\n // Off the top; scroll up.\n jumpBody.scrollTop = activeTop;\n } else if (activeBottom > jumpBody.scrollTop + jumpBody.clientHeight) {\n // Off the bottom; scroll down.\n jumpBody.scrollTop = activeBottom - jumpBody.clientHeight;\n }\n }\n activeJumpItem = n;\n }\n\n // Increment the activeJumpItem by delta.\n function incActiveJumpItem(delta: number) {\n if (activeJumpItem < 0) {\n return;\n }\n let n = activeJumpItem + delta;\n if (n < 0) {\n n = 0;\n }\n setActiveJumpItem(n);\n }\n\n // Pressing a key in the filter updates the list (if the filter actually changed).\n jumpFilter?.addEventListener('keyup', function () {\n if (jumpFilter.value.toUpperCase() != lastFilterValue.toUpperCase()) {\n updateJumpList(jumpFilter.value);\n }\n });\n\n // Pressing enter in the filter selects the first element in the list.\n jumpFilter?.addEventListener('keydown', function (event) {\n const upArrow = 38;\n const downArrow = 40;\n const enterKey = 13;\n switch (event.which) {\n case upArrow:\n incActiveJumpItem(-1);\n event.preventDefault();\n break;\n case downArrow:\n incActiveJumpItem(1);\n event.preventDefault();\n break;\n case enterKey:\n if (activeJumpItem >= 0) {\n if (jumpList) {\n (jumpList.children[activeJumpItem] as HTMLElement).click();\n event.preventDefault();\n }\n }\n break;\n }\n });\n\n const shortcutsDialog = document.querySelector<HTMLDialogElement>('.ShortcutsDialog');\n\n // - Pressing 'f' or 'F' opens the jump-to-symbol dialog.\n // - Pressing '?' opens up the shortcut dialog.\n // Ignore a keypress if a dialog is already open, or if it is pressed on a\n // component that wants to consume it.\n keyboard\n .on('f', 'open jump to modal', e => {\n if (jumpDialog?.open || shortcutsDialog?.open) {\n return;\n }\n e.preventDefault();\n if (jumpFilter) {\n jumpFilter.value = '';\n }\n jumpDialog?.showModal?.();\n jumpFilter?.focus();\n updateJumpList('');\n })\n .on('?', 'open shortcuts modal', () => {\n if (jumpDialog?.open || shortcutsDialog?.open) {\n return;\n }\n shortcutsDialog?.showModal?.();\n });\n\n const jumpOutlineInput = document.querySelector('.js-jumpToInput');\n if (jumpOutlineInput) {\n jumpOutlineInput.addEventListener('click', () => {\n if (jumpFilter) {\n jumpFilter.value = '';\n }\n updateJumpList('');\n if (jumpDialog?.open || shortcutsDialog?.open) {\n return;\n }\n jumpDialog?.showModal?.();\n jumpFilter?.focus();\n });\n }\n\n document.querySelector('.js-openShortcuts')?.addEventListener('click', () => {\n shortcutsDialog?.showModal?.();\n });\n}\n", "/**\n * @license\n * Copyright 2020 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\nimport { registerHeaderListeners, registerSearchFormListeners } from 'static/shared/header/header';\nimport { CarouselController } from 'static/shared/carousel/carousel';\nimport { ClipboardController } from 'static/shared/clipboard/clipboard';\nimport { ToolTipController } from 'static/shared/tooltip/tooltip';\nimport { SelectNavController } from 'static/shared/outline/select';\nimport { ModalController } from 'static/shared/modal/modal';\nimport { initModals } from 'static/shared/jump/jump';\n\nimport { keyboard } from 'static/shared/keyboard/keyboard';\nimport * as analytics from 'static/shared/analytics/analytics';\n\nwindow.addEventListener('load', () => {\n for (const el of document.querySelectorAll<HTMLButtonElement>('.js-clipboard')) {\n new ClipboardController(el);\n }\n\n for (const el of document.querySelectorAll<HTMLDialogElement>('.js-modal')) {\n new ModalController(el);\n }\n\n for (const t of document.querySelectorAll<HTMLDetailsElement>('.js-tooltip')) {\n new ToolTipController(t);\n }\n\n for (const el of document.querySelectorAll<HTMLSelectElement>('.js-selectNav')) {\n new SelectNavController(el);\n }\n\n for (const el of document.querySelectorAll<HTMLSelectElement>('.js-carousel')) {\n new CarouselController(el);\n }\n\n for (const el of document.querySelectorAll('.js-toggleTheme')) {\n el.addEventListener('click', () => {\n toggleTheme();\n });\n }\n\n if (document.querySelector<HTMLElement>('.js-gtmID')?.dataset.gtmid && window.dataLayer) {\n analytics.func(function () {\n removeUTMSource();\n });\n } else {\n removeUTMSource();\n }\n\n registerHeaderListeners();\n registerSearchFormListeners();\n initModals();\n});\n\n// Pressing '/' focuses the search box\nkeyboard.on('/', 'focus search', e => {\n const searchInput = Array.from(\n document.querySelectorAll<HTMLInputElement>('.js-searchFocus')\n ).pop();\n // Favoring the Firefox quick find feature over search input\n // focus. See: https://github.com/golang/go/issues/41093.\n if (searchInput && !window.navigator.userAgent.includes('Firefox')) {\n e.preventDefault();\n searchInput.focus();\n }\n});\n\n// Pressing 'y' changes the browser URL to the canonical URL\n// without triggering a reload.\nkeyboard.on('y', 'set canonical url', () => {\n let canonicalURLPath = document.querySelector<HTMLDivElement>('.js-canonicalURLPath')?.dataset[\n 'canonicalUrlPath'\n ];\n if (canonicalURLPath && canonicalURLPath !== '') {\n const fragment = window.location.hash;\n if (fragment) {\n canonicalURLPath += fragment;\n }\n window.history.replaceState(null, '', canonicalURLPath);\n }\n});\n\n/**\n * setupGoogleTagManager initializes Google Tag Manager.\n */\n(function setupGoogleTagManager() {\n analytics.track({\n 'gtm.start': new Date().getTime(),\n event: 'gtm.js',\n });\n})();\n\n/**\n * removeUTMSource removes the utm_source GET parameter if present.\n * This is done using JavaScript, so that the utm_source is still\n * captured by Google Analytics.\n */\nfunction removeUTMSource() {\n const urlParams = new URLSearchParams(window.location.search);\n const utmSource = urlParams.get('utm_source');\n if (utmSource !== 'gopls' && utmSource !== 'godoc' && utmSource !== 'pkggodev') {\n return;\n }\n\n /** Strip the utm_source query parameter and replace the URL. **/\n const newURL = new URL(window.location.href);\n urlParams.delete('utm_source');\n newURL.search = urlParams.toString();\n window.history.replaceState(null, '', newURL.toString());\n}\n\n/**\n * toggleTheme switches the preferred color scheme between auto, light, and dark.\n */\nfunction toggleTheme() {\n let nextTheme = 'dark';\n const theme = document.documentElement.getAttribute('data-theme');\n if (theme === 'dark') {\n nextTheme = 'light';\n } else if (theme === 'light') {\n nextTheme = 'auto';\n }\n let domain = '';\n if (location.hostname.endsWith('go.dev')) {\n domain = 'domain=.go.dev;';\n }\n document.documentElement.setAttribute('data-theme', nextTheme);\n document.cookie = `prefers-color-scheme=${nextTheme};${domain}path=/;max-age=31536000;`;\n}\n"],
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}