{
  "version": 3,
  "sources": ["sidenav.ts"],
  "sourcesContent": ["/*!\n * @license\n * Copyright 2019-2021 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 * Possible KeyboardEvent key values.\n * @private @enum {string}\n */\nconst Key = {\n  UP: 'ArrowUp',\n  DOWN: 'ArrowDown',\n  LEFT: 'ArrowLeft',\n  RIGHT: 'ArrowRight',\n  ENTER: 'Enter',\n  ASTERISK: '*',\n  SPACE: ' ',\n  END: 'End',\n  HOME: 'Home',\n\n  // Global keyboard shortcuts.\n  // TODO(golang.org/issue/40246): consolidate keyboard shortcut handling to avoid\n  // this duplication.\n  Y: 'y',\n  FORWARD_SLASH: '/',\n  QUESTION_MARK: '?',\n};\n\n/**\n * The navigation tree component of the documentation page.\n */\nclass DocNavTreeController {\n  /**\n   * The currently selected element.\n   */\n  private selectedEl: HTMLElement | null;\n  /**\n   * The index of the currently focused item. Used when navigating the tree\n   * using the keyboard.\n   */\n  private focusedIndex = 0;\n  /**\n   * The elements currently visible (not within a collapsed node of the tree).\n   */\n  private visibleItems: HTMLElement[] = [];\n  /**\n   * The current search string.\n   */\n  private searchString = '';\n  /**\n   * The timestamp of the last keydown event. Used to track whether to use the\n   * current search string.\n   */\n  private lastKeyDownTimeStamp = -Infinity;\n\n  /**\n   * Instantiates a navigation tree.\n   */\n  constructor(private el: Element) {\n    this.el = el;\n    this.selectedEl = null;\n    this.focusedIndex = 0;\n    this.visibleItems = [];\n    this.searchString = '';\n    this.lastKeyDownTimeStamp = -Infinity;\n    this.addEventListeners();\n    this.updateVisibleItems();\n    this.initialize();\n  }\n\n  /**\n   * Initializes the tree. Should be called only once.\n   */\n  private initialize() {\n    this.el.querySelectorAll(`[role='treeitem']`).forEach(el => {\n      el.addEventListener('click', e => this.handleItemClick(e as MouseEvent));\n    });\n\n    // TODO: remove once safehtml supports aria-owns with dynamic values.\n    this.el.querySelectorAll('[data-aria-owns]').forEach(el => {\n      el.setAttribute('aria-owns', el.getAttribute('data-aria-owns') ?? '');\n    });\n  }\n\n  private addEventListeners() {\n    this.el.addEventListener('keydown', e => this.handleKeyDown(e as KeyboardEvent));\n  }\n\n  /**\n   * Sets the visible item with the given index with the proper tabindex and\n   * focuses it.\n   */\n  setFocusedIndex(index: number) {\n    if (index === this.focusedIndex || index === -1) {\n      return;\n    }\n\n    let itemEl = this.visibleItems[this.focusedIndex];\n    itemEl.setAttribute('tabindex', '-1');\n\n    itemEl = this.visibleItems[index];\n    itemEl.setAttribute('tabindex', '0');\n    itemEl.focus();\n\n    this.focusedIndex = index;\n  }\n\n  /**\n   * Marks the navigation node with the given ID as selected. If no ID is\n   * provided, the first visible item in the tree is used.\n   */\n  setSelectedId(opt_id: string) {\n    if (this.selectedEl) {\n      this.selectedEl.removeAttribute('aria-selected');\n      this.selectedEl = null;\n    }\n    if (opt_id) {\n      this.selectedEl = this.el.querySelector(`[role='treeitem'][href='#${opt_id}']`);\n    } else if (this.visibleItems.length > 0) {\n      this.selectedEl = this.visibleItems[0];\n    }\n\n    if (!this.selectedEl) {\n      return;\n    }\n\n    // Close inactive top level item if selected id is not in its tree.\n    const topLevelExpanded = this.el.querySelector<HTMLElement>(\n      '[aria-level=\"1\"][aria-expanded=\"true\"]'\n    );\n    if (topLevelExpanded && !topLevelExpanded.parentElement?.contains(this.selectedEl)) {\n      this.collapseItem(topLevelExpanded);\n    }\n\n    if (this.selectedEl.getAttribute('aria-level') === '1') {\n      this.selectedEl.setAttribute('aria-expanded', 'true');\n    }\n    this.selectedEl.setAttribute('aria-selected', 'true');\n    this.expandAllParents(this.selectedEl);\n    this.scrollElementIntoView(this.selectedEl);\n  }\n\n  /**\n   * Expands all sibling items of the given element.\n   */\n  private expandAllSiblingItems(el: HTMLElement) {\n    const level = el.getAttribute('aria-level');\n    this.el.querySelectorAll(`[aria-level='${level}'][aria-expanded='false']`).forEach(el => {\n      el.setAttribute('aria-expanded', 'true');\n    });\n    this.updateVisibleItems();\n    this.focusedIndex = this.visibleItems.indexOf(el);\n  }\n\n  /**\n   * Expands all parent items of the given element.\n   */\n  private expandAllParents(el: HTMLElement) {\n    if (!this.visibleItems.includes(el)) {\n      let owningItemEl = this.owningItem(el);\n      while (owningItemEl) {\n        this.expandItem(owningItemEl);\n        owningItemEl = this.owningItem(owningItemEl);\n      }\n    }\n  }\n\n  /**\n   * Scrolls the given element into view, aligning the element in the center\n   * of the viewport. If the element is already in view, no scrolling occurs.\n   */\n  private scrollElementIntoView(el: HTMLElement) {\n    const STICKY_HEADER_HEIGHT_PX = 55;\n    const viewportHeightPx = document.documentElement.clientHeight;\n    const elRect = el.getBoundingClientRect();\n    const verticalCenterPointPx = (viewportHeightPx - STICKY_HEADER_HEIGHT_PX) / 2;\n    if (elRect.top < STICKY_HEADER_HEIGHT_PX) {\n      // Element is occluded at top of view by header or by being offscreen.\n      this.el.scrollTop -=\n        STICKY_HEADER_HEIGHT_PX - elRect.top - elRect.height + verticalCenterPointPx;\n    } else if (elRect.bottom > viewportHeightPx) {\n      // Element is below viewport.\n      this.el.scrollTop = elRect.bottom - viewportHeightPx + verticalCenterPointPx;\n    } else {\n      return;\n    }\n  }\n\n  /**\n   * Handles when a tree item is clicked.\n   */\n  private handleItemClick(e: MouseEvent) {\n    const el = e.target as HTMLSelectElement | null;\n    if (!el) return;\n    this.setFocusedIndex(this.visibleItems.indexOf(el));\n    if (el.hasAttribute('aria-expanded')) {\n      this.toggleItemExpandedState(el);\n    }\n    this.closeInactiveDocNavGroups(el);\n  }\n\n  /**\n   * Closes inactive top level nav groups when a new tree item clicked.\n   */\n  private closeInactiveDocNavGroups(el: HTMLElement) {\n    if (el.hasAttribute('aria-expanded')) {\n      const level = el.getAttribute('aria-level');\n      document.querySelectorAll(`[aria-level=\"${level}\"]`).forEach(nav => {\n        if (nav.getAttribute('aria-expanded') === 'true' && nav !== el) {\n          nav.setAttribute('aria-expanded', 'false');\n        }\n      });\n      this.updateVisibleItems();\n      this.focusedIndex = this.visibleItems.indexOf(el);\n    }\n  }\n\n  /**\n   * Handles when a key is pressed when the component is in focus.\n   */\n  handleKeyDown(e: KeyboardEvent) {\n    const targetEl = e.target as HTMLElement | null;\n\n    switch (e.key) {\n      case Key.ASTERISK:\n        if (targetEl) {\n          this.expandAllSiblingItems(targetEl);\n        }\n        e.stopPropagation();\n        e.preventDefault();\n        return;\n\n      // Global keyboard shortcuts.\n      // TODO(golang.org/issue/40246): consolidate keyboard shortcut handling\n      // to avoid this duplication.\n      case Key.FORWARD_SLASH:\n      case Key.QUESTION_MARK:\n        return;\n\n      case Key.DOWN:\n        this.focusNextItem();\n        break;\n\n      case Key.UP:\n        this.focusPreviousItem();\n        break;\n\n      case Key.LEFT:\n        if (targetEl?.getAttribute('aria-expanded') === 'true') {\n          this.collapseItem(targetEl);\n        } else {\n          this.focusParentItem(targetEl);\n        }\n        break;\n\n      case Key.RIGHT: {\n        switch (targetEl?.getAttribute('aria-expanded')) {\n          case 'false':\n            this.expandItem(targetEl);\n            break;\n          case 'true':\n            // Select the first child.\n            this.focusNextItem();\n            break;\n        }\n        break;\n      }\n\n      case Key.HOME:\n        this.setFocusedIndex(0);\n        break;\n\n      case Key.END:\n        this.setFocusedIndex(this.visibleItems.length - 1);\n        break;\n\n      case Key.ENTER:\n        if (targetEl?.tagName === 'A') {\n          // Enter triggers desired behavior by itself.\n          return;\n        }\n      // Fall through for non-anchor items to be handled the same as when\n      // the space key is pressed.\n      // eslint-disable-next-line no-fallthrough\n      case Key.SPACE:\n        targetEl?.click();\n        break;\n\n      default:\n        // Could be a typeahead search.\n        this.handleSearch(e);\n        return;\n    }\n    e.preventDefault();\n    e.stopPropagation();\n  }\n\n  /**\n   * Handles when a key event isn\u2019t matched by shortcut handling, indicating\n   * that the user may be attempting a typeahead search.\n   */\n  private handleSearch(e: KeyboardEvent) {\n    if (\n      e.metaKey ||\n      e.altKey ||\n      e.ctrlKey ||\n      e.isComposing ||\n      e.key.length > 1 ||\n      !e.key.match(/\\S/)\n    ) {\n      return;\n    }\n\n    // KeyDown events should be within one second of each other to be considered\n    // part of the same typeahead search string.\n    const MAX_TYPEAHEAD_THRESHOLD_MS = 1000;\n    if (e.timeStamp - this.lastKeyDownTimeStamp > MAX_TYPEAHEAD_THRESHOLD_MS) {\n      this.searchString = '';\n    }\n    this.lastKeyDownTimeStamp = e.timeStamp;\n    this.searchString += e.key.toLocaleLowerCase();\n    const focusedElementText = this.visibleItems[\n      this.focusedIndex\n    ].textContent?.toLocaleLowerCase();\n    if (this.searchString.length === 1 || !focusedElementText?.startsWith(this.searchString)) {\n      this.focusNextItemWithPrefix(this.searchString);\n    }\n    e.stopPropagation();\n    e.preventDefault();\n  }\n\n  /**\n   * Focuses on the next visible tree item (after the currently focused element,\n   * wrapping the tree) that has a prefix equal to the given search string.\n   */\n  focusNextItemWithPrefix(prefix: string) {\n    let i = this.focusedIndex + 1;\n    if (i > this.visibleItems.length - 1) {\n      i = 0;\n    }\n    while (i !== this.focusedIndex) {\n      if (this.visibleItems[i].textContent?.toLocaleLowerCase().startsWith(prefix)) {\n        this.setFocusedIndex(i);\n        return;\n      }\n      if (i >= this.visibleItems.length - 1) {\n        i = 0;\n      } else {\n        i++;\n      }\n    }\n  }\n\n  private toggleItemExpandedState(el: HTMLElement) {\n    el.getAttribute('aria-expanded') === 'true' ? this.collapseItem(el) : this.expandItem(el);\n  }\n\n  private focusPreviousItem() {\n    this.setFocusedIndex(Math.max(0, this.focusedIndex - 1));\n  }\n\n  private focusNextItem() {\n    this.setFocusedIndex(Math.min(this.visibleItems.length - 1, this.focusedIndex + 1));\n  }\n\n  private collapseItem(el: HTMLElement) {\n    el.setAttribute('aria-expanded', 'false');\n    this.updateVisibleItems();\n  }\n\n  private expandItem(el: HTMLElement) {\n    el.setAttribute('aria-expanded', 'true');\n    this.updateVisibleItems();\n  }\n\n  private focusParentItem(el: HTMLElement | null) {\n    const owningItemEl = this.owningItem(el);\n    if (owningItemEl) {\n      this.setFocusedIndex(this.visibleItems.indexOf(owningItemEl));\n    }\n  }\n\n  /**\n   * @returnThe first parent item that \u201Cowns\u201D the group that el is a member of,\n   * or null if there is none.\n   */\n  owningItem(el: HTMLElement | null) {\n    const groupEl = el?.closest(`[role='group']`);\n    if (!groupEl) {\n      return null;\n    }\n    return groupEl.parentElement?.querySelector<HTMLElement>(`[aria-owns='${groupEl.id}']`);\n  }\n\n  /**\n   * Updates which items are visible (not a child of a collapsed item).\n   */\n  private updateVisibleItems() {\n    const allEls = Array.from(this.el.querySelectorAll<HTMLElement>(`[role='treeitem']`));\n    const hiddenEls = Array.from(\n      this.el.querySelectorAll(`[aria-expanded='false'] + [role='group'] [role='treeitem']`)\n    );\n    this.visibleItems = allEls.filter(el => !hiddenEls.includes(el));\n  }\n}\n\n/**\n * Primary controller for the documentation page, handling coordination between\n * the navigation and content components. This class ensures that any\n * documentation elements in view are properly shown/highlighted in the\n * navigation components.\n *\n * Since navigation is essentially handled by anchor tags with fragment IDs as\n * hrefs, the fragment ID (referenced in this code as simply \u201CID\u201D) is used to\n * look up both navigation and content nodes.\n */\nclass DocPageController {\n  private navController?: DocNavTreeController;\n  private mobileNavController?: MobileNavController;\n  /**\n   * Instantiates the controller, setting up the navigation controller (both\n   * desktop and mobile), and event listeners. This should only be called once.\n   */\n  constructor(\n    sideNavEl: HTMLElement | null,\n    mobileNavEl: HTMLElement | null,\n    private contentEl: HTMLElement | null\n  ) {\n    if (!sideNavEl || !contentEl) {\n      console.warn('Unable to find all elements needed for navigation');\n      return;\n    }\n\n    this.navController = new DocNavTreeController(sideNavEl);\n\n    if (mobileNavEl) {\n      this.mobileNavController = new MobileNavController(mobileNavEl);\n    }\n    window.addEventListener('hashchange', () => this.handleHashChange());\n\n    this.updateSelectedIdFromWindowHash();\n  }\n\n  /**\n   * Handles when the location hash changes.\n   */\n  private handleHashChange() {\n    this.updateSelectedIdFromWindowHash();\n  }\n\n  private updateSelectedIdFromWindowHash() {\n    const targetId = this.targetIdFromLocationHash();\n    this.navController?.setSelectedId(targetId);\n    if (this.mobileNavController) {\n      this.mobileNavController.setSelectedId(targetId);\n    }\n    if (targetId !== '') {\n      const targetEl = this.contentEl?.querySelector<HTMLElement>(`[id='${targetId}']`);\n      if (targetEl) {\n        targetEl.focus();\n      }\n    }\n  }\n\n  targetIdFromLocationHash() {\n    return window.location.hash && window.location.hash.substr(1);\n  }\n}\n\n/**\n * Controller for the navigation element used on smaller viewports. It utilizes\n * a native <select> element for interactivity and a styled <label> for\n * displaying the selected option.\n *\n * It presumes a fixed header and that the container for the control will be\n * sticky right below the header when scrolled enough.\n */\nclass MobileNavController {\n  private selectEl: HTMLSelectElement | null;\n  private labelTextEl: HTMLElement | null;\n  private intersectionObserver: IntersectionObserver;\n\n  constructor(private el: HTMLElement) {\n    this.selectEl = el.querySelector<HTMLSelectElement>('select');\n    this.labelTextEl = el.querySelector<HTMLElement>('.js-mobileNavSelectText');\n\n    this.selectEl?.addEventListener('change', e => this.handleSelectChange(e));\n\n    // We use a slight hack to detect if the mobile nav container is pinned to\n    // the bottom of the site header. The root viewport of an IntersectionObserver\n    // is inset by the header height plus one pixel to ensure that the container is\n    // considered \u201Cout of view\u201D when in a fixed position and can be styled appropriately.\n    const ROOT_TOP_MARGIN = '-57px';\n\n    this.intersectionObserver = new IntersectionObserver(\n      entries => this.intersectionObserverCallback(entries),\n      {\n        rootMargin: `${ROOT_TOP_MARGIN} 0px 0px 0px`,\n        threshold: 1.0,\n      }\n    );\n    this.intersectionObserver.observe(this.el);\n  }\n\n  setSelectedId(id: string) {\n    if (!this.selectEl) return;\n    this.selectEl.value = id;\n    this.updateLabelText();\n  }\n\n  private updateLabelText() {\n    if (!this.labelTextEl || !this.selectEl) return;\n    const selectedIndex = this.selectEl?.selectedIndex;\n    if (selectedIndex === -1) {\n      this.labelTextEl.textContent = '';\n      return;\n    }\n    this.labelTextEl.textContent = this.selectEl.options[selectedIndex].textContent;\n  }\n\n  private handleSelectChange(e: Event) {\n    window.location.hash = `#${(e.target as HTMLSelectElement).value}`;\n    this.updateLabelText();\n  }\n\n  private intersectionObserverCallback(entries: IntersectionObserverEntry[]) {\n    const SHADOW_CSS_CLASS = 'DocNavMobile--withShadow';\n    entries.forEach(entry => {\n      // entry.isIntersecting isn\u2019t reliable on Firefox.\n      const fullyInView = entry.intersectionRatio === 1.0;\n      entry.target.classList.toggle(SHADOW_CSS_CLASS, !fullyInView);\n    });\n  }\n}\n\nnew DocPageController(\n  document.querySelector('.js-tree'),\n  document.querySelector('.js-mobileNav'),\n  document.querySelector('.js-unitDetailsContent')\n);\n"],
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