{
  "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", "about/index.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 2022 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 * Left Navigation.\n */\nexport const initJumpLinks = async function () {\n  const pagesWithJumpLinks = ['/about'];\n  if (!pagesWithJumpLinks.includes(window.location.pathname)) {\n    // stop the file from doing anything else if the page doesn't have jumplinks\n    return;\n  }\n\n  // these might be generated or not so don't grab references to the elements until actually need them.\n  const titles = 'h2, h3, h4';\n  const nav = '.LeftNav a';\n  // these are always in the dom so we can get them now and throw errors if they're not.\n  const leftNav = document.querySelector('.LeftNav');\n  const siteContent = document.querySelector('.go-Content');\n  let isObserverDisabled = false;\n\n  /**\n   * El function\n   * @example el('h1', {className: 'title'}, 'Welcome to the site');\n   * @example el('ul', {className: 'list'}, el('li', {}, 'Item one'), el('li', {}, 'Item two'), el('li', {}, 'Item three'));\n   * @example el('img', {src: '/url.svg'});\n   */\n  function el(\n    type = '',\n    props: { [key: string]: string } = {},\n    ...children: (HTMLElement | HTMLElement[] | string | undefined)[]\n  ) {\n    // Error, no type declared.\n    if (!type) {\n      throw new Error('Provide `type` to create document element.');\n    }\n\n    // Create element with optional attribute props\n    const docEl = Object.assign(document.createElement(type), props);\n\n    // Children: array containing strings or elements\n    children.forEach(child => {\n      if (typeof child === 'string') {\n        docEl.appendChild(document.createTextNode(child));\n      } else if (Array.isArray(child)) {\n        child.forEach(c => docEl.appendChild(c));\n      } else if (child instanceof HTMLElement) {\n        docEl.appendChild(child);\n      }\n    });\n\n    return docEl;\n  }\n  /**  Build Nav if data hydrate is present. */\n  function buildNav() {\n    return new Promise((resolve, reject) => {\n      let navItems: { id: string; label: string; subnav?: { id: string; label: string }[] }[] = [];\n      let elements: HTMLElement[] = [];\n\n      if (!siteContent || !leftNav) {\n        return reject('.SiteContent not found.');\n      }\n      if (leftNav instanceof HTMLElement && !leftNav?.dataset?.hydrate) {\n        return resolve(true);\n      }\n\n      for (const title of siteContent.querySelectorAll(titles)) {\n        if (title instanceof HTMLElement && !title?.dataset?.ignore) {\n          switch (title.tagName) {\n            case 'H2':\n              navItems = [\n                ...navItems,\n                {\n                  id: title.id,\n                  label: title?.dataset?.title ? title.dataset.title : title.textContent ?? '',\n                },\n              ];\n              break;\n\n            case 'H3':\n            case 'H4':\n              if (!navItems[navItems.length - 1]?.subnav) {\n                navItems[navItems.length - 1].subnav = [\n                  {\n                    id: title.id,\n                    label: title?.dataset?.title ? title.dataset.title : title.textContent ?? '',\n                  },\n                ];\n              } else if (navItems[navItems.length - 1].subnav) {\n                navItems[navItems.length - 1].subnav?.push({\n                  id: title.id,\n                  label: title?.dataset?.title ? title.dataset.title : title.textContent ?? '',\n                });\n              }\n              break;\n          }\n        }\n      }\n\n      for (const navItem of navItems) {\n        const link = el('a', { href: '#' + navItem.id }, el('span', {}, navItem.label));\n        elements = [...elements, link];\n        if (navItem?.subnav) {\n          let subLinks: HTMLElement[] = [];\n          for (const subnavItem of navItem.subnav) {\n            const subItem = el(\n              'li',\n              {},\n              el(\n                'a',\n                { href: '#' + subnavItem.id },\n                el('img', { src: '/static/frontend/about/dot.svg', width: '5', height: '5' }),\n                el('span', {}, subnavItem.label)\n              )\n            );\n            subLinks = [...subLinks, subItem];\n          }\n          const list = el('ul', { className: 'LeftSubnav' }, subLinks);\n          elements = [...elements, list];\n        }\n      }\n\n      elements.forEach(element => leftNav.appendChild(element));\n\n      return resolve(true);\n    });\n  }\n  /**\n   * Set the correct active element.\n   */\n  function setNav() {\n    return new Promise(resolve => {\n      if (!document.querySelectorAll(nav)) return resolve(true);\n      for (const a of document.querySelectorAll(nav)) {\n        if (a instanceof HTMLAnchorElement && a.href === location.href) {\n          setElementActive(a);\n          break;\n        }\n      }\n      resolve(true);\n    });\n  }\n  /** resetNav: removes all .active from nav elements */\n  function resetNav() {\n    return new Promise(resolve => {\n      if (!document.querySelectorAll(nav)) return resolve(true);\n      for (const a of document.querySelectorAll(nav)) {\n        a.classList.remove('active');\n      }\n      resolve(true);\n    });\n  }\n  /** setElementActive: controls resetting nav and highlighting the appropriate nav items */\n  function setElementActive(element: HTMLAnchorElement) {\n    if (element instanceof HTMLAnchorElement) {\n      resetNav().then(() => {\n        element.classList.add('active');\n        const parent = element?.parentNode?.parentNode;\n        if (parent instanceof HTMLElement && parent?.classList?.contains('LeftSubnav')) {\n          parent.previousElementSibling?.classList.add('active');\n        }\n      });\n    }\n  }\n  /** setLinkManually: disables observer and selects the clicked nav item. */\n  function setLinkManually() {\n    delayObserver();\n    const link = document.querySelector('[href=\"' + location.hash + '\"]');\n    if (link instanceof HTMLAnchorElement) {\n      setElementActive(link);\n    }\n  }\n  /** delayObserver: Quick on off switch for intersection observer. */\n  function delayObserver() {\n    isObserverDisabled = true;\n    setTimeout(() => {\n      isObserverDisabled = false;\n    }, 200);\n  }\n  /** observeSections: kicks off observation of titles as well as manual clicks with hashchange */\n  function observeSections() {\n    window.addEventListener('hashchange', setLinkManually);\n\n    if (siteContent?.querySelectorAll(titles)) {\n      const callback: IntersectionObserverCallback = entries => {\n        if (!isObserverDisabled && Array.isArray(entries) && entries.length > 0) {\n          for (const entry of entries) {\n            if (entry.isIntersecting && entry.target instanceof HTMLElement) {\n              const { id } = entry.target;\n              const link = document.querySelector('[href=\"#' + id + '\"]');\n              if (link instanceof HTMLAnchorElement) {\n                setElementActive(link);\n              }\n              break;\n            }\n          }\n        }\n      };\n      // rootMargin is important when multiple sections are in the observable area **on page load**.\n      // they will still be highlighted on scroll because of the root margin.\n      const ob = new IntersectionObserver(callback, {\n        threshold: 0,\n        rootMargin: '0px 0px -50% 0px',\n      });\n      for (const title of siteContent.querySelectorAll(titles)) {\n        if (title instanceof HTMLElement && !title?.dataset?.ignore) {\n          ob.observe(title);\n        }\n      }\n    }\n  }\n\n  try {\n    await buildNav();\n    await setNav();\n    if (location.hash) {\n      delayObserver();\n    }\n    observeSections();\n  } catch (e) {\n    if (e instanceof Error) {\n      console.error(e.message);\n    } else {\n      console.error(e);\n    }\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';\nimport { initJumpLinks } from './about/index';\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  initJumpLinks();\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. 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}