{
  "version": 3,
  "sources": ["../../../shared/playground/playground.ts", "../../../shared/outline/select.ts", "../../../shared/outline/tree.ts", "../../../shared/table/table.ts", "main.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\n// This file implements the playground implementation of the documentation\n// page. The playground involves a \"play\" button that allows you to open up\n// a new link to play.golang.org using the example code.\n\n// The CSS is in static/frontend/unit/main/_doc.css\n\n/**\n * CSS classes used by PlaygroundExampleController\n */\nconst PlayExampleClassName = {\n  PLAY_HREF: '.js-exampleHref',\n  PLAY_CONTAINER: '.js-exampleContainer',\n  EXAMPLE_INPUT: '.Documentation-exampleCode',\n  EXAMPLE_OUTPUT: '.Documentation-exampleOutput',\n  EXAMPLE_ERROR: '.Documentation-exampleError',\n  PLAY_BUTTON: '.Documentation-examplePlayButton',\n  SHARE_BUTTON: '.Documentation-exampleShareButton',\n  FORMAT_BUTTON: '.Documentation-exampleFormatButton',\n  RUN_BUTTON: '.Documentation-exampleRunButton',\n};\n\n/**\n * This controller enables playground examples to expand their dropdown or\n * generate shareable Go Playground URLs.\n */\nexport class PlaygroundExampleController {\n  /**\n   * The anchor tag used to identify the container with an example href.\n   * There is only one in an example container div.\n   */\n  private readonly anchorEl: HTMLAnchorElement | null;\n\n  /**\n   * The error element\n   */\n  private readonly errorEl: Element | null;\n\n  /**\n   * Buttons that redirect to an example's playground, this element\n   * only exists in executable examples.\n   */\n  private readonly playButtonEl: Element | null;\n  private readonly shareButtonEl: Element | null;\n\n  /**\n   * Button that formats the code in an example's playground.\n   */\n  private readonly formatButtonEl: Element | null;\n\n  /**\n   * Button that runs the code in an example's playground, this element\n   * only exists in executable examples.\n   */\n  private readonly runButtonEl: Element | null;\n\n  /**\n   * The executable code of an example.\n   */\n  private readonly inputEl: HTMLTextAreaElement | null;\n\n  /**\n   * The output of the given example code. This only exists if the\n   * author of the package provides an output for this example.\n   */\n  private readonly outputEl: Element | null;\n\n  /**\n   * @param exampleEl The div that contains playground content for the given example.\n   */\n  constructor(private readonly exampleEl: HTMLDetailsElement) {\n    this.exampleEl = exampleEl;\n    this.anchorEl = exampleEl.querySelector('a');\n    this.errorEl = exampleEl.querySelector(PlayExampleClassName.EXAMPLE_ERROR);\n    this.playButtonEl = exampleEl.querySelector(PlayExampleClassName.PLAY_BUTTON);\n    this.shareButtonEl = exampleEl.querySelector(PlayExampleClassName.SHARE_BUTTON);\n    this.formatButtonEl = exampleEl.querySelector(PlayExampleClassName.FORMAT_BUTTON);\n    this.runButtonEl = exampleEl.querySelector(PlayExampleClassName.RUN_BUTTON);\n    this.inputEl = this.makeTextArea(exampleEl.querySelector(PlayExampleClassName.EXAMPLE_INPUT));\n    this.outputEl = exampleEl.querySelector(PlayExampleClassName.EXAMPLE_OUTPUT);\n\n    // This is legacy listener to be replaced the listener for shareButtonEl.\n    this.playButtonEl?.addEventListener('click', () => this.handleShareButtonClick());\n    this.shareButtonEl?.addEventListener('click', () => this.handleShareButtonClick());\n    this.formatButtonEl?.addEventListener('click', () => this.handleFormatButtonClick());\n    this.runButtonEl?.addEventListener('click', () => this.handleRunButtonClick());\n\n    if (!this.inputEl) return;\n\n    this.resize();\n    this.inputEl.addEventListener('keyup', () => this.resize());\n    this.inputEl.addEventListener('keydown', e => this.onKeydown(e));\n  }\n\n  /**\n   * Replace the pre element with a textarea. The examples are initially rendered\n   * as pre elements so they're fully visible when JS is disabled.\n   */\n  makeTextArea(el: Element | null): HTMLTextAreaElement {\n    const t = document.createElement('textarea');\n    t.classList.add('Documentation-exampleCode', 'code');\n    t.spellcheck = false;\n    t.value = el?.textContent ?? '';\n    el?.parentElement?.replaceChild(t, el);\n    return t;\n  }\n\n  /**\n   * Retrieve the hash value of the anchor element.\n   */\n  getAnchorHash(): string | undefined {\n    return this.anchorEl?.hash;\n  }\n\n  /**\n   * Expands the current playground example.\n   */\n  expand(): void {\n    this.exampleEl.open = true;\n  }\n\n  /**\n   * Resizes the input element to accommodate the amount of text present.\n   */\n  private resize(): void {\n    if (this.inputEl?.value) {\n      const numLineBreaks = (this.inputEl.value.match(/\\n/g) || []).length;\n      // min-height + lines x line-height + padding + border\n      this.inputEl.style.height = `${(20 + numLineBreaks * 20 + 12 + 2) / 16}rem`;\n    }\n  }\n\n  /**\n   * Handler to override keyboard behavior in the playground's\n   * textarea element.\n   *\n   * Tab key inserts tabs into the example playground instead of\n   * switching to the next interactive element.\n   * @param e input element keyboard event.\n   */\n  private onKeydown(e: KeyboardEvent) {\n    if (e.key === 'Tab') {\n      document.execCommand('insertText', false, '\\t');\n      e.preventDefault();\n    }\n  }\n\n  /**\n   * Changes the text of the example's input box.\n   */\n  private setInputText(output: string) {\n    if (this.inputEl) {\n      this.inputEl.value = output;\n    }\n  }\n\n  /**\n   * Changes the text of the example's output box.\n   */\n  private setOutputText(output: string) {\n    if (this.outputEl) {\n      this.outputEl.textContent = output;\n    }\n  }\n\n  /**\n   * Appends to the text of the example's output box.\n   */\n  private appendToOutputText(output: string) {\n    if (this.outputEl) {\n      this.outputEl.textContent += output;\n    }\n  }\n\n  private setOutputHTML(output: string) {\n    if (this.outputEl) {\n      this.outputEl.innerHTML = output;\n    }\n  }\n\n  /**\n   * Sets the error message text and overwrites\n   * output box to indicate a failed response.\n   */\n  private setErrorText(err: string) {\n    if (this.errorEl) {\n      this.errorEl.textContent = err;\n    }\n    this.setOutputText('An error has occurred\u2026');\n  }\n\n  private getCodeWithModFile(): string {\n    let codeWithModFile = this.inputEl?.value ?? '';\n    const moduleVars = document.querySelector<HTMLDivElement>('.js-playgroundVars')?.dataset ?? {};\n    if (moduleVars.modulepath !== 'std') {\n      codeWithModFile = codeWithModFile.concat(`\n-- go.mod --\nmodule play.ground\n\nrequire ${moduleVars.modulepath} ${moduleVars.version}\n`);\n    }\n\n    return codeWithModFile;\n  }\n\n  /**\n   * Opens a new window to play.golang.org using the\n   * example snippet's code in the playground.\n   */\n  private handleShareButtonClick() {\n    const PLAYGROUND_BASE_URL = 'https://play.golang.org/p/';\n\n    this.setOutputText('Waiting for remote server\u2026');\n\n    fetch('/play/share', {\n      method: 'POST',\n      body: this.getCodeWithModFile(),\n    })\n      .then(res => res.text())\n      .then(shareId => {\n        const href = PLAYGROUND_BASE_URL + shareId;\n        this.setOutputHTML(`<a href=\"${href}\">${href}</a>`);\n        window.open(href);\n      })\n      .catch(err => {\n        this.setErrorText(err);\n      });\n  }\n\n  /**\n   * Runs gofmt on the example snippet in the playground.\n   */\n  private handleFormatButtonClick() {\n    this.setOutputText('Waiting for remote server\u2026');\n    const body = new FormData();\n    body.append('body', this.inputEl?.value ?? '');\n\n    fetch('/play/fmt', {\n      method: 'POST',\n      body: body,\n    })\n      .then(res => res.json())\n      .then(({ Body, Error }) => {\n        this.setOutputText(Error || 'Done.');\n        if (Body) {\n          this.setInputText(Body);\n          this.resize();\n        }\n      })\n      .catch(err => {\n        this.setErrorText(err);\n      });\n  }\n\n  /**\n   * Runs the code snippet in the example playground.\n   */\n  private handleRunButtonClick() {\n    this.setOutputText('Waiting for remote server\u2026');\n\n    fetch('/play/compile', {\n      method: 'POST',\n      body: JSON.stringify({ body: this.getCodeWithModFile(), version: 2 }),\n    })\n      .then(res => res.json())\n      .then(async ({ Events, Errors }) => {\n        this.setOutputText(Errors || '');\n        for (const e of Events || []) {\n          this.appendToOutputText(e.Message);\n          await new Promise(resolve => setTimeout(resolve, e.Delay / 1000000));\n        }\n      })\n      .catch(err => {\n        this.setErrorText(err);\n      });\n  }\n}\n\nexport function initPlaygrounds(): void {\n  const exampleHashRegex = location.hash.match(/^#(example-.*)$/);\n  if (exampleHashRegex) {\n    const exampleHashEl = document.getElementById(exampleHashRegex[1]) as HTMLDetailsElement;\n    if (exampleHashEl) {\n      exampleHashEl.open = true;\n    }\n  }\n\n  // We use a spread operator to convert a nodelist into an array of elements.\n  const exampleHrefs = [\n    ...document.querySelectorAll<HTMLAnchorElement>(PlayExampleClassName.PLAY_HREF),\n  ];\n\n  /**\n   * Sometimes exampleHrefs and playContainers are in different order, so we\n   * find an exampleHref from a common hash.\n   * @param playContainer - playground container\n   */\n  const findExampleHash = (playContainer: PlaygroundExampleController) =>\n    exampleHrefs.find(ex => {\n      return ex.hash === playContainer.getAnchorHash();\n    });\n\n  for (const el of document.querySelectorAll(PlayExampleClassName.PLAY_CONTAINER)) {\n    // There should be the same amount of hrefs referencing examples as example containers.\n    const playContainer = new PlaygroundExampleController(el as HTMLDetailsElement);\n    const exampleHref = findExampleHash(playContainer);\n    if (exampleHref) {\n      exampleHref.addEventListener('click', () => {\n        playContainer.expand();\n      });\n    } else {\n      console.warn('example href not found');\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\n/**\n * TreeNavController is the navigation tree component of the documentation page.\n * It adds accessiblity attributes to a tree, observes the heading elements\n * focus the topmost link for headings visible on the page, and implements the\n * WAI-ARIA Treeview Design Pattern with full\n * [keyboard support](https://www.w3.org/TR/wai-aria-practices/examples/treeview/treeview-2/treeview-2a.html#kbd_label).\n */\nexport class TreeNavController {\n  treeitems: TreeItem[];\n\n  /**\n   * firstChars is the first character of each treeitem in the same order\n   * as this.treeitems. We use this array to set focus by character when\n   * navigating the tree with a keyboard.\n   */\n  private firstChars: string[];\n  private firstTreeitem: TreeItem | null;\n  private lastTreeitem: TreeItem | null;\n  private observerCallbacks: ((t: TreeItem) => void)[];\n\n  constructor(private el: HTMLElement) {\n    this.treeitems = [];\n    this.firstChars = [];\n    this.firstTreeitem = null;\n    this.lastTreeitem = null;\n    this.observerCallbacks = [];\n    this.init();\n  }\n\n  private init(): void {\n    this.handleResize();\n    window.addEventListener('resize', this.handleResize);\n    this.findTreeItems();\n    this.updateVisibleTreeitems();\n    this.observeTargets();\n    if (this.firstTreeitem) {\n      this.firstTreeitem.el.tabIndex = 0;\n    }\n  }\n\n  private handleResize = (): void => {\n    this.el.style.setProperty('--js-tree-height', '100vh');\n    this.el.style.setProperty('--js-tree-height', this.el.clientHeight + 'px');\n  };\n\n  private observeTargets() {\n    this.addObserver(treeitem => {\n      this.expandTreeitem(treeitem);\n      this.setSelected(treeitem);\n      // TODO: Fix scroll issue in https://golang.org/issue/47450.\n      // treeitem.el.scrollIntoView({ block: 'nearest' });\n    });\n\n    const targets = new Map<string, boolean>();\n    const observer = new IntersectionObserver(\n      entries => {\n        for (const entry of entries) {\n          targets.set(entry.target.id, entry.isIntersecting || entry.intersectionRatio === 1);\n        }\n        for (const [id, isIntersecting] of targets) {\n          if (isIntersecting) {\n            const active = this.treeitems.find(t =>\n              (t.el as HTMLAnchorElement)?.href.endsWith(`#${id}`)\n            );\n            if (active) {\n              for (const fn of this.observerCallbacks) {\n                fn(active);\n              }\n            }\n            break;\n          }\n        }\n      },\n      {\n        threshold: 1.0,\n        rootMargin: '-60px 0px 0px 0px',\n      }\n    );\n\n    for (const href of this.treeitems.map(t => t.el.getAttribute('href'))) {\n      if (href) {\n        const id = href.replace(window.location.origin, '').replace('/', '').replace('#', '');\n        const target = document.getElementById(id);\n        if (target) {\n          observer.observe(target);\n        }\n      }\n    }\n  }\n\n  addObserver(fn: (t: TreeItem) => void, delay = 200): void {\n    this.observerCallbacks.push(debounce(fn, delay));\n  }\n\n  setFocusToNextItem(currentItem: TreeItem): void {\n    let nextItem = null;\n    for (let i = currentItem.index + 1; i < this.treeitems.length; i++) {\n      const ti = this.treeitems[i];\n      if (ti.isVisible) {\n        nextItem = ti;\n        break;\n      }\n    }\n    if (nextItem) {\n      this.setFocusToItem(nextItem);\n    }\n  }\n\n  setFocusToPreviousItem(currentItem: TreeItem): void {\n    let prevItem = null;\n    for (let i = currentItem.index - 1; i > -1; i--) {\n      const ti = this.treeitems[i];\n      if (ti.isVisible) {\n        prevItem = ti;\n        break;\n      }\n    }\n    if (prevItem) {\n      this.setFocusToItem(prevItem);\n    }\n  }\n\n  setFocusToParentItem(currentItem: TreeItem): void {\n    if (currentItem.groupTreeitem) {\n      this.setFocusToItem(currentItem.groupTreeitem);\n    }\n  }\n\n  setFocusToFirstItem(): void {\n    this.firstTreeitem && this.setFocusToItem(this.firstTreeitem);\n  }\n\n  setFocusToLastItem(): void {\n    this.lastTreeitem && this.setFocusToItem(this.lastTreeitem);\n  }\n\n  setSelected(currentItem: TreeItem): void {\n    for (const l1 of this.el.querySelectorAll('[aria-expanded=\"true\"]')) {\n      if (l1 === currentItem.el) continue;\n      if (!l1.nextElementSibling?.contains(currentItem.el)) {\n        l1.setAttribute('aria-expanded', 'false');\n      }\n    }\n    for (const l1 of this.el.querySelectorAll('[aria-selected]')) {\n      if (l1 !== currentItem.el) {\n        l1.setAttribute('aria-selected', 'false');\n      }\n    }\n    currentItem.el.setAttribute('aria-selected', 'true');\n    this.updateVisibleTreeitems();\n    this.setFocusToItem(currentItem, false);\n  }\n\n  expandTreeitem(treeitem: TreeItem): void {\n    let currentItem: TreeItem | null = treeitem;\n    while (currentItem) {\n      if (currentItem.isExpandable) {\n        currentItem.el.setAttribute('aria-expanded', 'true');\n      }\n      currentItem = currentItem.groupTreeitem;\n    }\n    this.updateVisibleTreeitems();\n  }\n\n  expandAllSiblingItems(currentItem: TreeItem): void {\n    for (const ti of this.treeitems) {\n      if (ti.groupTreeitem === currentItem.groupTreeitem && ti.isExpandable) {\n        this.expandTreeitem(ti);\n      }\n    }\n  }\n\n  collapseTreeitem(currentItem: TreeItem): void {\n    let groupTreeitem = null;\n\n    if (currentItem.isExpanded()) {\n      groupTreeitem = currentItem;\n    } else {\n      groupTreeitem = currentItem.groupTreeitem;\n    }\n\n    if (groupTreeitem) {\n      groupTreeitem.el.setAttribute('aria-expanded', 'false');\n      this.updateVisibleTreeitems();\n      this.setFocusToItem(groupTreeitem);\n    }\n  }\n\n  setFocusByFirstCharacter(currentItem: TreeItem, char: string): void {\n    let start: number, index: number;\n    char = char.toLowerCase();\n\n    // Get start index for search based on position of currentItem\n    start = currentItem.index + 1;\n    if (start === this.treeitems.length) {\n      start = 0;\n    }\n\n    // Check remaining slots in the menu\n    index = this.getIndexFirstChars(start, char);\n\n    // If not found in remaining slots, check from beginning\n    if (index === -1) {\n      index = this.getIndexFirstChars(0, char);\n    }\n\n    // If match was found...\n    if (index > -1) {\n      this.setFocusToItem(this.treeitems[index]);\n    }\n  }\n\n  private findTreeItems() {\n    const findItems = (el: HTMLElement, group: TreeItem | null) => {\n      let ti = group;\n      let curr = el.firstElementChild as HTMLElement;\n      while (curr) {\n        if (curr.tagName === 'A' || curr.tagName === 'SPAN') {\n          ti = new TreeItem(curr, this, group);\n          this.treeitems.push(ti);\n          this.firstChars.push(ti.label.substring(0, 1).toLowerCase());\n        }\n        if (curr.firstElementChild) {\n          findItems(curr, ti);\n        }\n        curr = curr.nextElementSibling as HTMLElement;\n      }\n    };\n    findItems(this.el as HTMLElement, null);\n    this.treeitems.map((ti, idx) => (ti.index = idx));\n  }\n\n  private updateVisibleTreeitems(): void {\n    this.firstTreeitem = this.treeitems[0];\n\n    for (const ti of this.treeitems) {\n      let parent = ti.groupTreeitem;\n      ti.isVisible = true;\n      while (parent && parent.el !== this.el) {\n        if (!parent.isExpanded()) {\n          ti.isVisible = false;\n        }\n        parent = parent.groupTreeitem;\n      }\n      if (ti.isVisible) {\n        this.lastTreeitem = ti;\n      }\n    }\n  }\n\n  private setFocusToItem(treeitem: TreeItem, focusEl = true) {\n    treeitem.el.tabIndex = 0;\n    if (focusEl) {\n      treeitem.el.focus();\n    }\n    for (const ti of this.treeitems) {\n      if (ti !== treeitem) {\n        ti.el.tabIndex = -1;\n      }\n    }\n  }\n\n  private getIndexFirstChars(startIndex: number, char: string): number {\n    for (let i = startIndex; i < this.firstChars.length; i++) {\n      if (this.treeitems[i].isVisible && char === this.firstChars[i]) {\n        return i;\n      }\n    }\n    return -1;\n  }\n}\n\nclass TreeItem {\n  el: HTMLElement;\n  groupTreeitem: TreeItem | null;\n  label: string;\n  isExpandable: boolean;\n  isVisible: boolean;\n  depth: number;\n  index: number;\n\n  private tree: TreeNavController;\n  private isInGroup: boolean;\n\n  constructor(el: HTMLElement, treeObj: TreeNavController, group: TreeItem | null) {\n    el.tabIndex = -1;\n    this.el = el;\n    this.groupTreeitem = group;\n    this.label = el.textContent?.trim() ?? '';\n    this.tree = treeObj;\n    this.depth = (group?.depth || 0) + 1;\n    this.index = 0;\n\n    const parent = el.parentElement;\n    if (parent?.tagName.toLowerCase() === 'li') {\n      parent?.setAttribute('role', 'none');\n    }\n    el.setAttribute('aria-level', this.depth + '');\n    if (el.getAttribute('aria-label')) {\n      this.label = el?.getAttribute('aria-label')?.trim() ?? '';\n    }\n\n    this.isExpandable = false;\n    this.isVisible = false;\n    this.isInGroup = !!group;\n\n    let curr = el.nextElementSibling;\n    while (curr) {\n      if (curr.tagName.toLowerCase() == 'ul') {\n        const groupId = `${group?.label ?? ''} nav group ${this.label}`.replace(/[\\W_]+/g, '_');\n        el.setAttribute('aria-owns', groupId);\n        el.setAttribute('aria-expanded', 'false');\n        curr.setAttribute('role', 'group');\n        curr.setAttribute('id', groupId);\n        this.isExpandable = true;\n        break;\n      }\n\n      curr = curr.nextElementSibling;\n    }\n    this.init();\n  }\n\n  private init() {\n    this.el.tabIndex = -1;\n    if (!this.el.getAttribute('role')) {\n      this.el.setAttribute('role', 'treeitem');\n    }\n    this.el.addEventListener('keydown', this.handleKeydown.bind(this));\n    this.el.addEventListener('click', this.handleClick.bind(this));\n    this.el.addEventListener('focus', this.handleFocus.bind(this));\n    this.el.addEventListener('blur', this.handleBlur.bind(this));\n  }\n\n  isExpanded() {\n    if (this.isExpandable) {\n      return this.el.getAttribute('aria-expanded') === 'true';\n    }\n\n    return false;\n  }\n\n  isSelected() {\n    return this.el.getAttribute('aria-selected') === 'true';\n  }\n\n  private handleClick(event: MouseEvent) {\n    // only process click events that directly happened on this treeitem\n    if (event.target !== this.el && event.target !== this.el.firstElementChild) {\n      return;\n    }\n    if (this.isExpandable) {\n      if (this.isExpanded() && this.isSelected()) {\n        this.tree.collapseTreeitem(this);\n      } else {\n        this.tree.expandTreeitem(this);\n      }\n      event.stopPropagation();\n    }\n    this.tree.setSelected(this);\n  }\n\n  private handleFocus() {\n    let el = this.el;\n    if (this.isExpandable) {\n      el = (el.firstElementChild as HTMLElement) ?? el;\n    }\n    el.classList.add('focus');\n  }\n\n  private handleBlur() {\n    let el = this.el;\n    if (this.isExpandable) {\n      el = (el.firstElementChild as HTMLElement) ?? el;\n    }\n    el.classList.remove('focus');\n  }\n\n  private handleKeydown(event: KeyboardEvent) {\n    if (event.altKey || event.ctrlKey || event.metaKey) {\n      return;\n    }\n\n    let captured = false;\n    switch (event.key) {\n      case ' ':\n      case 'Enter':\n        if (this.isExpandable) {\n          if (this.isExpanded() && this.isSelected()) {\n            this.tree.collapseTreeitem(this);\n          } else {\n            this.tree.expandTreeitem(this);\n          }\n          captured = true;\n        } else {\n          event.stopPropagation();\n        }\n        this.tree.setSelected(this);\n        break;\n\n      case 'ArrowUp':\n        this.tree.setFocusToPreviousItem(this);\n        captured = true;\n        break;\n\n      case 'ArrowDown':\n        this.tree.setFocusToNextItem(this);\n        captured = true;\n        break;\n\n      case 'ArrowRight':\n        if (this.isExpandable) {\n          if (this.isExpanded()) {\n            this.tree.setFocusToNextItem(this);\n          } else {\n            this.tree.expandTreeitem(this);\n          }\n        }\n        captured = true;\n        break;\n\n      case 'ArrowLeft':\n        if (this.isExpandable && this.isExpanded()) {\n          this.tree.collapseTreeitem(this);\n          captured = true;\n        } else {\n          if (this.isInGroup) {\n            this.tree.setFocusToParentItem(this);\n            captured = true;\n          }\n        }\n        break;\n\n      case 'Home':\n        this.tree.setFocusToFirstItem();\n        captured = true;\n        break;\n\n      case 'End':\n        this.tree.setFocusToLastItem();\n        captured = true;\n        break;\n\n      default:\n        if (event.key.length === 1 && event.key.match(/\\S/)) {\n          if (event.key == '*') {\n            this.tree.expandAllSiblingItems(this);\n          } else {\n            this.tree.setFocusByFirstCharacter(this, event.key);\n          }\n          captured = true;\n        }\n        break;\n    }\n\n    if (captured) {\n      event.stopPropagation();\n      event.preventDefault();\n    }\n  }\n}\n\n// eslint-disable-next-line @typescript-eslint/no-explicit-any\nfunction debounce<T extends (...args: any[]) => any>(func: T, wait: number) {\n  let timeout: ReturnType<typeof setTimeout> | null;\n  return (...args: Parameters<T>) => {\n    const later = () => {\n      timeout = null;\n      func(...args);\n    };\n    if (timeout) {\n      clearTimeout(timeout);\n    }\n    timeout = setTimeout(later, wait);\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\n/**\n * Controller for a table element with expandable rows. 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'false' : 'true');\n    e.stopPropagation();\n    this.update();\n  }\n\n  expandAllItems = (): void => {\n    this.toggles.map(t => t.setAttribute('aria-expanded', 'true'));\n    this.update();\n  };\n\n  private collapseAllItems = () => {\n    this.toggles.map(t => t.setAttribute('aria-expanded', 'false'));\n    this.update();\n  };\n\n  private update = () => {\n    this.updateVisibleItems();\n    setTimeout(() => this.updateGlobalToggle());\n  };\n\n  private updateVisibleItems() {\n    this.rows.map(t => {\n      const isExpanded = t?.getAttribute('aria-expanded') === 'true';\n      const rowIds = t?.getAttribute('aria-controls')?.trimEnd().split(' ');\n      rowIds?.map(id => {\n        const target = document.getElementById(`${id}`);\n        if (isExpanded) {\n          target?.classList.add('visible');\n          target?.classList.remove('hidden');\n        } else {\n          target?.classList.add('hidden');\n          target?.classList.remove('visible');\n        }\n      });\n    });\n  }\n\n  private updateGlobalToggle() {\n    if (!this.toggleAll) return;\n    if (this.rows.some(t => t.hasAttribute('aria-expanded'))) {\n      this.toggleAll.style.display = 'block';\n    }\n    const someCollapsed = this.toggles.some(el => el.getAttribute('aria-expanded') === 'false');\n    if (someCollapsed) {\n      this.toggleAll.innerText = 'Expand all';\n      this.toggleAll.onclick = this.expandAllItems;\n    } else {\n      this.toggleAll.innerText = 'Collapse all';\n      this.toggleAll.onclick = this.collapseAllItems;\n    }\n  }\n}\n", "import { initPlaygrounds } from 'static/shared/playground/playground';\nimport { SelectNavController, makeSelectNav } from 'static/shared/outline/select';\nimport { TreeNavController } from 'static/shared/outline/tree';\nimport { ExpandableRowsTableController } from 'static/shared/table/table';\n\ninitPlaygrounds();\n\nconst directories = document.querySelector<HTMLTableElement>('.js-expandableTable');\nif (directories) {\n  const table = new ExpandableRowsTableController(\n    directories,\n    document.querySelector<HTMLButtonElement>('.js-expandAllDirectories')\n  );\n  // Expand directories on page load with expand-directories query param.\n  if (window.location.search.includes('expand-directories')) {\n    table.expandAllItems();\n  }\n}\n\nconst treeEl = document.querySelector<HTMLElement>('.js-tree');\nif (treeEl) {\n  const treeCtrl = new TreeNavController(treeEl);\n  const select = makeSelectNav(treeCtrl);\n  const mobileNav = document.querySelector('.js-mainNavMobile');\n  if (mobileNav && mobileNav.firstElementChild) {\n    mobileNav?.replaceChild(select, mobileNav.firstElementChild);\n  }\n  if (select.firstElementChild) {\n    new SelectNavController(select.firstElementChild);\n  }\n}\n\n/**\n * Event handlers for expanding and collapsing the readme section.\n */\nconst readme = document.querySelector('.js-readme');\nconst readmeContent = document.querySelector('.js-readmeContent');\nconst readmeOutline = document.querySelector('.js-readmeOutline');\nconst readmeExpand = document.querySelectorAll('.js-readmeExpand');\nconst readmeCollapse = document.querySelector('.js-readmeCollapse');\nconst mobileNavSelect = document.querySelector<HTMLSelectElement>('.DocNavMobile-select');\nif (readme && readmeContent && readmeOutline && readmeExpand.length && readmeCollapse) {\n  if (readme.clientHeight > 320) {\n    readme?.classList.remove('UnitReadme--expanded');\n    readme?.classList.add('UnitReadme--toggle');\n  }\n  if (window.location.hash.includes('readme')) {\n    expandReadme();\n  }\n  mobileNavSelect?.addEventListener('change', e => {\n    if ((e.target as HTMLSelectElement).value.startsWith('readme-')) {\n      expandReadme();\n    }\n  });\n  readmeExpand.forEach(el =>\n    el.addEventListener('click', e => {\n      e.preventDefault();\n      expandReadme();\n      readme.scrollIntoView();\n    })\n  );\n  readmeCollapse.addEventListener('click', e => {\n    e.preventDefault();\n    readme.classList.remove('UnitReadme--expanded');\n    if (readmeExpand[1]) {\n      readmeExpand[1].scrollIntoView({ block: 'center' });\n    }\n  });\n  readmeContent.addEventListener('keyup', () => {\n    expandReadme();\n  });\n  readmeContent.addEventListener('click', () => {\n    expandReadme();\n  });\n  readmeOutline.addEventListener('click', () => {\n    expandReadme();\n  });\n  document.addEventListener('keydown', e => {\n    if ((e.ctrlKey || e.metaKey) && e.key === 'f') {\n      expandReadme();\n    }\n  });\n}\n\n/**\n * expandReadme expands the readme and adds the section-readme hash to the\n * URL so it stays expanded when navigating back from an external link.\n */\nfunction expandReadme() {\n  history.replaceState(null, '', `${location.pathname}#section-readme`);\n  readme?.classList.add('UnitReadme--expanded');\n}\n\n/**\n * Expand details items that are focused. This will expand\n * deprecated symbols when they are navigated to from the index\n * or a direct link.\n */\nfunction openDeprecatedSymbol() {\n  if (!location.hash) return;\n  const heading = document.getElementById(location.hash.slice(1));\n  const grandParent = heading?.parentElement?.parentElement as HTMLDetailsElement | null;\n  if (grandParent?.nodeName === 'DETAILS') {\n    grandParent.open = true;\n  }\n}\nopenDeprecatedSymbol();\nwindow.addEventListener('hashchange', () => openDeprecatedSymbol());\n\n/**\n * Listen for changes in the build context dropdown.\n */\ndocument.querySelectorAll('.js-buildContextSelect').forEach(el => {\n  el.addEventListener('change', e => {\n    window.location.search = `?GOOS=${(e.target as HTMLSelectElement).value}`;\n  });\n});\n"],
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  "names": ["PlayExampleClassName", "PlaygroundExampleController", "exampleEl", "_a", "_b", "_c", "_d", "e", "el", "numLineBreaks", "output", "err", "codeWithModFile", "moduleVars", "PLAYGROUND_BASE_URL", "res", "shareId", "href", "body", "Body", "Error", "Events", "Errors", "resolve", "initPlaygrounds", "exampleHashRegex", "exampleHashEl", "exampleHrefs", "findExampleHash", "playContainer", "ex", "exampleHref", "SelectNavController", "el", "e", "target", "href", "makeSelectNav", "tree", "label", "select", "outline", "groupMap", "group", "t", "o", "_a", "hash", "value", "TreeNavController", "el", "treeitem", "targets", "observer", "entries", "entry", "id", "isIntersecting", "active", "t", "_a", "fn", "href", "target", "delay", "debounce", "currentItem", "nextItem", "ti", "prevItem", "l1", "groupTreeitem", "char", "start", "index", "findItems", "group", "curr", "TreeItem", "idx", "parent", "focusEl", "startIndex", "treeObj", "_b", "_c", "_d", "_e", "groupId", "event", "captured", "func", "wait", "timeout", "args", "later", "ExpandableRowsTableController", "table", "toggleAll", "t", "a", "_a", "e", "target", "isExpanded", "rowIds", "id", "el", "initPlaygrounds", "directories", "table", "ExpandableRowsTableController", "treeEl", "treeCtrl", "TreeNavController", "select", "makeSelectNav", "mobileNav", "SelectNavController", "readme", "readmeContent", "readmeOutline", "readmeExpand", "readmeCollapse", "mobileNavSelect", "expandReadme", "e", "el", "openDeprecatedSymbol", "_a", "heading", "grandParent"]
}