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Tab management.\n\nconst _             = require('lodash');\nconst createHistory = require('./history');\n\n\nmodule.exports = class Tabs extends Array {\n\n  constructor(browser) {\n    super();\n    this._current = null;\n    this._browser = browser;\n    this.length   = 0;\n    Object.defineProperty(this, 'length',   { enumerable: false, writable: true });\n    Object.defineProperty(this, '_browser', { enumerable: false, writable: true });\n    Object.defineProperty(this, '_current', { enumerable: false, writable: true });\n  }\n\n  // Get the currently open tab\n  get current() {\n    return this._current;\n  }\n\n  // Sets the currently open tab\n  // - Name   - Pick existing window with this name\n  // - Number - Pick existing window from tab position\n  // - Window - Use this window\n  set current(nameOrWindow) {\n    const window = this.find(nameOrWindow);\n    if (this._indexOf(window) < 0)\n      return;\n    if (!Tabs.sameWindow(this._current, window)) {\n      if (this._current)\n        this._browser.emit('inactive', this._current);\n      this._current = window;\n      this._browser.emit('active', this._current);\n    }\n  }\n\n  // Returns window by index or name. Use this for window names that shadow\n  // existing properties (e.g. tabs['open'] is a function, use\n  find(nameOrWindow) {\n    if (this.propertyIsEnumerable(nameOrWindow))\n      return this[nameOrWindow];\n    const byName = _.find(this, { name: nameOrWindow });\n    if (byName)\n      return byName;\n    if (this._indexOf(nameOrWindow) >= 0)\n      return nameOrWindow;\n    return null;\n  }\n\n  // Index of currently selected tab.\n  get index() {\n    return this._indexOf(this._current);\n  }\n\n  // Opens and returns a tab.  If an open window by the same name already exists,\n  // opens this window in the same tab.  Omit name or use '_blank' to always open\n  // a new tab.\n  //\n  // name    - Window name (optional)\n  // opener  - Opening window (window.open call)\n  // referer - Referrer\n  // url     - Set document location to this URL upon opening\n  // html    - Document contents (browser.load)\n  open(options = {}) {\n\n    // If name window in open tab, reuse that tab. Otherwise, open new window.\n    const named = options.name && this.find(options.name.toString());\n    if (named) {\n      // Select this as the currently open tab. Changing the location would then\n      // select a different window.\n      this._current = named;\n      if (options.url)\n        this._current.location = options.url;\n      return this._current;\n    }\n\n    // When window changes we need to change tab slot. We can't keep the index\n    // around, since tab order changes, so we look up the currently known\n    // active window and switch that around.\n    let active = null;\n    const open = createHistory(this._browser, (window)=> {\n      // Focus changes to different window, make it the active window\n      if (!Tabs.sameWindow(window, active)) {\n        const index = this._indexOf(active);\n        if (index >= 0)\n          this[index] = window;\n        this.current = active = window;\n      }\n      if (window)\n        this._browser._eventLoop.setActiveWindow(window);\n    });\n\n    const name = options.name === '_blank' ? '' : (options.name || '');\n    options.name = name;\n    const window = open(options);\n    this.push(window);\n    if (name && (this.propertyIsEnumerable(name) || !this[name]))\n      this[name] = window;\n    // Select this as the currently open tab\n    this.current = active = window;\n    return window;\n  }\n\n  // Close an open tab.\n  //\n  // With no argument, closes the currently open tab (tabs.current).\n  //\n  // Argument can be the window, window name or tab position (same as find).\n  close(nameOrWindow) {\n    const window = nameOrWindow ?  this.find(nameOrWindow) : this._current;\n    if (this._indexOf(window) >= 0)\n      window.close();\n  }\n\n  // Closes all open tabs/windows.\n  closeAll() {\n    const tabs = this.slice();\n    this._current = null;\n    for (let tab of tabs)\n      tab.close();\n  }\n\n  // Dump list of all open tabs to stdout or output stream.\n  dump(output = process.stdout) {\n    if (this.length === 0) {\n      output.write('No open tabs.\\n');\n      return;\n    }\n    for (let tab of this)\n      output.write(`Window ${tab.name || 'unnamed'} open to ${tab.location.href}\\n`);\n  }\n\n\n  // Find the position of this window in the tabs array\n  _indexOf(window) {\n    if (!window)\n      return -1;\n    return this.slice().map(tab => tab._globalProxy).indexOf(window._globalProxy);\n  }\n\n  // Called when window closed to remove it from tabs list.\n  _closed(window) {\n    const index = this._indexOf(window);\n    if (index >= 0) {\n      this._browser.emit('inactive', window);\n\n      this.splice(index, 1);\n      if (this.propertyIsEnumerable(window.name))\n        delete this[window.name];\n\n      // If we closed the currently open tab, need to select another window.\n      if (Tabs.sameWindow(window, this._current)) {\n        // Don't emit inactive event for closed window.\n        this._current = this[index - 1] || this[0];\n        if (this._current)\n          this._browser.emit('active', this._current);\n      }\n    }\n\n  }\n\n  // Determine if two windows are the same\n  static sameWindow(a, b) {\n    return a && b && a._globalProxy === b._globalProxy;\n  }\n};\n"]}