loadJQuery();
addPolyfills();
addExtensions();

// --- Get infos about this script file ---

var scriptElement = document.querySelector('script[src$="static/content.js"]');
var scriptDir = scriptElement.src.substr(0, scriptElement.src.lastIndexOf('/'));

// --- User data ---

var user = {
  fontSize: 1.0,
  clickTab: 0,
  displaySidebar: true,
  colorScheme: null,
  collapseQuickRef: false
}

// --- Cached data ---

// To have the data remain while navigating through the docs, it'll be stored into
// sessionStorage. Fallbacks to window.name if sessionStorage is not supported.
// Note: CHM doesn't support window.localStorage/sessionStorage or cookies.

var cache = {
  colorScheme: user.colorScheme,
  scriptDir: scriptDir,
  fontSize: user.fontSize,
  forceNoFrame: false,
  forceNoScript: false,
  clickTab: user.clickTab,
  displaySidebar: user.displaySidebar,
  sidebarWidth: '18em',
  collapseQuickRef: user.collapseQuickRef,
  RightIsFocused: true,
  toc_clickItem: null,
  toc_clickItemTemp: null,
  toc_scrollPos: 0,
  index_filter:-1,
  index_input: "",
  index_clickItem: 0,
  index_scrollPos: 0,
  search_data: {},
  search_highlightWords: false,
  search_input: "",
  search_clickItem: 0,
  search_scrollPos: 0,
  load: function() {
    if (window.sessionStorage)
    {
      var data = JSON.parse(window.sessionStorage.getItem('data'));
      if (!data)
        return false;
    }
    else try {
      var data = JSON.parse(window.name);
    } catch(e) {
      return false;
    }
    if (data.scriptDir != scriptDir)
      return false;
    $.extend(this, data);
    return true;
  },
  save: function() {
    if (window.sessionStorage)
      window.sessionStorage.setItem('data', JSON.stringify(this));
    else
      window.name = JSON.stringify(this);
  },
  set: function(prop, value) {
    this[prop] = value;
    try {
      postMessageToFrame('updateCache', [prop, value])
    } catch(e) {}
    return value;
  }
};

// --- Main Execute Area ---

// Set global variables:
var forceNoScript = forceNoScript || false;
var isCacheLoaded = cache.load();
var workingDir = getWorkingDir();
var relPath = getRelativePath(location.href, workingDir);
var equivPath = $('meta[name|="ahk:equiv"]').prop('content');
var isInsideCHM = (location.href.search(/::/) > 0) ? 1 : 0;
var supportsHistory = (history.replaceState) && !isInsideCHM;
var isFrameCapable = !cache.forceNoFrame && (isInsideCHM || supportsHistory);
var isInsideFrame = (window.self !== window.top);
var isSearchBot = navigator.userAgent.match(/googlebot|bingbot|slurp/i);
var isTouch = !!("ontouchstart" in window) || !!(navigator.msMaxTouchPoints);
// http://stackoverflow.com/a/9851769
var isOpera = (!!window.opr && !!opr.addons) || !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0; // Opera 8.0+
var isFirefox = typeof InstallTrigger !== 'undefined'; // Firefox 1.0+
var isSafari = Object.prototype.toString.call(window.HTMLElement).indexOf('Constructor') > 0; // At least Safari 3+: "[object HTMLElementConstructor]"
var isIE = /*@cc_on!@*/false || !!document.documentMode; // Internet Explorer 6-11
var isIE8 = !-[1,]; // Internet Explorer 8 or below
var isIE9 = navigator.userAgent.match(/MSIE 9/); // Internet Explorer 9
var isEdge = !isIE && !!window.StyleMedia; // Edge 20+
var isChrome = !!window.chrome && (!!window.chrome.webstore || !!window.chrome.csi); // Chrome 1+
var isBlink = (isChrome || isOpera) && !!window.CSS; // Blink engine detection
var structure = new ctor_structure;
var toc = new ctor_toc;
var index = new ctor_index;
var search = new ctor_search;
var features = new ctor_features;
var translate = {dataPath: scriptDir + '/source/data_translate.js'};
var deprecate = {dataPath: scriptDir + '/source/data_deprecate.js'};

scriptElement.insertAdjacentHTML('afterend', structure.metaViewport);
var isPhone = (document.documentElement.clientWidth <= 600);

(function() {
  // Exit the script if the user is a search bot. This is done because we want
  // to prevent the search bot from parsing the elements added via javascript,
  // otherwise the search results would be distorted:
  if (isSearchBot)
    return;

  // Get user data:
  if (!isCacheLoaded) {
    if (isInsideCHM) {
      var m = scriptDir.match(/mk:@MSITStore:(.*?)\\[^\\]+\.chm/i);
      if (m[1])
        loadScript(decodeURI(m[1]) + '\\chm_config.js', function () {
          try {
            $.extend(cache, overwriteProps(user, config));
            setInitialSettings();
          } catch (e) {}
        });
    }
    else if (window.localStorage) {
      config = JSON.parse(window.localStorage.getItem('config'));
      $.extend(cache, overwriteProps(user, config));
      setInitialSettings();
    }
    else if (navigator.cookieEnabled) {
      config = document.cookie.match(/config=([^;]+)/);
      config && (config = JSON.parse(config[1]));
      $.extend(cache, overwriteProps(user, config));
      setInitialSettings();
    }
  }
  else
    setInitialSettings();
  
  function setInitialSettings() {
    // font size
    if (!isFrameCapable && cache.fontSize != 1)
      $('head').append('<style>#right .area {font-size:' + cache.fontSize + 'em}</style>');
    // color scheme
    structure.setScheme(cache.colorScheme);
  }

  // Exit the script on sites which doesn't need the sidebar:
  if (forceNoScript || cache.forceNoScript)
    return;

  // Special treatments for pages inside a frame:
  if (isFrameCapable)
  {
    if (isInsideFrame)
    {
      if (cache.fontSize != 1)
        $('head').append('<style>body {font-size:' + cache.fontSize + 'em}</style>');
      normalizeParentURL = function() {
        var url = getUrlParameter('url');
        postMessageToParent('normalizeURL', [url ? {"href": url} : $.extend({}, window.location), document.title, supportsHistory ? history.state : null, equivPath]);
        if (cache.toc_clickItemTemp)
          if (supportsHistory)
            history.replaceState($.extend(history.state, {toc_clickItemTemp: cache.toc_clickItemTemp}), null, null);
        cache.set('toc_clickItemTemp', null);
      }
      normalizeParentURL(); $(window).on('hashchange', normalizeParentURL);
      structure.setScheme(cache.colorScheme);
      structure.addShortcuts();
      structure.addAnchorFlash();
      structure.saveCacheBeforeLeaving();
      if (!isIE) {
        structure.hideFrameBeforeLeaving();
        postMessageToParent('unhideFrame', []);
      }
      $(document).ready(function() {
        $('html').attr({ id: 'right'});
        features.add();
      });
      $(window).on('message onmessage', function(event) {
        var data = parseJSON(event.originalEvent.data);
        if (Array.isArray(data) === false)
          return;
        switch(data[0]) {
          case 'updateCache':
          if(typeof data[1] === 'object')
            $.extend(cache, data[1]);
          else
            cache[data[1]] = data[2];
          break;

          case 'highlightWords':
          search.highlightWords(data[1]);
          break;

          case 'scrollToMatch':
          search.scrollToMatch(data[1]);
          break;

          case 'setScheme':
          structure.setScheme(data[1]);
          break;
        }
      });
      return;
    }
    else
    {
      $(window).on('message onmessage', function(event) {
        var data = parseJSON(event.originalEvent.data);
        if (Array.isArray(data) === false)
          return;
        switch(data[0]) {
          case 'normalizeURL':
          var relPath = getRelativePath(data[1].href, workingDir);
          try {
            if (history.replaceState)
              history.replaceState(null, null, data[1].href);
          }
          catch(e) {
            if (history.replaceState)
              history.replaceState(null, null, "?frame=" + encodeURI(relPath).replace(/#/g, '%23'));
          }
          document.title = data[2];
          if (structure.modifyTools)
            structure.modifyTools(relPath, data[4]);
          if ($('#left > div.toc li > span.selected a').attr('href') == data[1].href)
            break;
          else if (data[3] && data[3].toc_clickItemTemp) {
            toc.deselect($('#left > div.toc'));
            $('#left > div.toc li > span').eq(data[3].toc_clickItemTemp).trigger('select');
          }
          else
            toc.preSelect($('#left > div.toc'), data[1]);
          break;

          case 'pressKey':
          structure.pressKey(data[1]);
          break;

          case 'updateQuickRef':
          structure.updateQuickRef(data[1], data[2]);
          break;

          case 'hideFrame':
          $('#right .load').hide().show(0); // reload animation
          document.getElementById('frame').className = 'hidden';
          break;

          case 'unhideFrame':
          document.getElementById('frame').className = 'visible';
          break;
        }
      });

      $(window).on('hashchange', function() {
        structure.openSite(location.href);
      });
    }
  }

  // Add elements for sidebar:
  structure.build();

  // Load current URL into frame:
  if (isFrameCapable)
    $(document).ready(function() {
      if (window.sessionStorage)
        window.sessionStorage.setItem('data', JSON.stringify(cache));
      else
        document.getElementById('frame').contentWindow.name = JSON.stringify(cache);
      structure.openSite(scriptDir + '/../' + (getUrlParameter('frame') || relPath));
    });

  // Modify the site:
  document.getElementsByTagName('body')[0].className += ' body';
  structure.modify();
  if (!isFrameCapable)
    $(document).ready(features.add);
  toc.modify();
  index.modify();
  search.modify();
})();

// --- Constructor: Table of content ---

function ctor_toc()
{
  var self = this;
  self.dataPath = scriptDir + '/source/data_toc.js';
  self.create = function(input) { // Create and add TOC items.
    var ul = document.createElement("ul");
    for(var i = 0; i < input.length; i++)
    {
      var text = input[i][0];
      var path = input[i][1];
      var subitems = input[i][2];
      if (path != '')
      {
        var el = document.createElement("a");
        el.href = workingDir + path;
        if (cache.deprecate_data[path])
          el.className = "deprecated";
      }
      else
        var el = document.createElement("button");
      if (isIE8)
        el.innerHTML = text;
      else
      {
        el.setAttribute("data-content", text);
        el.setAttribute("aria-label", text);
      }
      var span = document.createElement("span");
      span.innerHTML = el.outerHTML;
      var li = document.createElement("li");
      li.title = text;
      if (cache.deprecate_data[path])
        li.title += "\n\n" + T("Deprecated. New scripts should use {0} instead.").format(cache.deprecate_data[path]);
      if (subitems != undefined && subitems.length > 0)
      {
        li.className = "closed";
        li.innerHTML = span.outerHTML;
        li.innerHTML += self.create(subitems).outerHTML;
      }
      else
        li.innerHTML = span.outerHTML;
      ul.innerHTML += li.outerHTML;
    }
    return ul;
  };
  // --- Modify the elements of the TOC tab ---
  self.modify = function() {

    if (!retrieveData(self.dataPath, "toc_data", "tocData", self.modify))
      return;
    if (!retrieveData(deprecate.dataPath, "deprecate_data", "deprecateData", self.modify))
      return;
    if (!retrieveData(translate.dataPath, "translate_data", "translateData", self.modify))
      return;

    $toc = $('#left div.toc').html(self.create(cache.toc_data));
    $tocList = $toc.find('li > span');
    // --- Fold items with subitems ---

    $toc.find('li > ul').hide();

    // --- Hook up events ---

    // Select the item on click:
    registerEvent($toc, 'click', 'li > span', function() {
      $this = $(this);
      cache.set('toc_clickItem', $tocList.index(this));
      cache.set('toc_scrollPos', $toc.scrollTop());
      // Fold/unfold item with subitems:
      if ($this.parent().has("ul").length) {
        $this.siblings("ul").slideToggle(100);
        $this.closest("li").toggleClass("closed opened");
      }
      // Higlight and open item with link:
      if ($this.has("a").length) {
        self.deselect($toc); $this.trigger('select');
        structure.openSite($this.children('a').attr('href'));
        structure.focusContent();
        return false;
      }
    });

    // Highlight the item and parents on select:
    registerEvent($toc, 'select', 'li > span', function() {
      $this = $(this);
      // Highlight the item:
      $this.addClass("selected");
      // Highlight its parents:
      $this.parent("li").has('ul').addClass('highlighted');
      $this.parent().parents('li').addClass('highlighted');
      // Unfold parent items:
      $this.parents("ul").show();
      $this.parents("ul").closest("li").removeClass('closed').addClass('opened');
    });

    // --- Show scrollbar on mouseover ---

    if (!isTouch) // if not touch device.
    {
      $toc.css("overflow", "hidden").hover(function() {
        $(this).css("overflow", "auto");
      }, function() {
        $(this).css("overflow", "hidden");
      });
    }
    self.preSelect($toc, location);
    if (!isFrameCapable || cache.search_input)
      $(document).ready(function() {
        setTimeout( function() { self.preSelect($toc, location); }, 0);
      });
  };
  self.preSelect = function($toc, url) { // Apply stored settings.
    var tocList = $toc.find('li > span');
    var clicked = tocList.eq(cache.toc_clickItem);
    var found = null;
    var foundList = [];
    var foundNoHashList = [];
    var url_href = (url.href.slice(-1) == '/') ? url.href + 'index.htm' : url.href;
    for (var i = 0; i < tocList.length; i++) {
      var href = tocList[i].firstChild.href;
      if (!href)
        continue;
      // Search for items matching the address:
      if (href == url_href)
        foundList.push($(tocList[i]));
      // Search for items matching the address without anchor:
      else if (href == url_href.substring(0, url_href.length - url.hash.length))
        foundNoHashList.push($(tocList[i]));
    }
    if (foundList.length)
      found = $(foundList).map($.fn.toArray);
    else if (foundNoHashList.length)
      found = $(foundNoHashList).map($.fn.toArray);
    var el = found;
    // If the last clicked item can be found in the matches, use it instead:
    if (clicked.is(found))
      el = clicked;
    else
      cache.set('toc_scrollPos', ""); // Force calculated scrolling.
    // If items are found:
    if (el) {
      // Highlight items and parents:
      self.deselect($toc); el.trigger('select');
      // Scroll to the last match:
      if (cache.toc_scrollPos != "" || cache.toc_scrollPos != 0)
        $toc.scrollTop(cache.toc_scrollPos);
      if (!isScrolledIntoView(el, $toc)) {
        el[el.length-1].scrollIntoView(false);
        $toc.scrollTop($toc.scrollTop()+100);
      }
    }
  }
  self.deselect = function($toc) { // Deselect all items.
    $toc.find("span.selected").removeClass("selected");
    $toc.find(".highlighted").removeClass("highlighted");
  }
}

// --- Constructor: Keyword search ---

function ctor_index()
{
  var self = this;
  self.dataPath = scriptDir + '/source/data_index.js';
  self.create = function(input, filter) { // Create and add the index links.

    var output = '', label, path, type;
    var type_name = {2: T("function"), 4: T("operator"), 6: T("class")};
    var lang = T('en');
    var collator = window.Intl ? new Intl.Collator(lang) : null;
    if (collator)
      input.sort(function(a, b) { return collator.compare(a[0], b[0]); });
    else
      input.sort(function(a, b) { return a[0].localeCompare(b[0], lang); });
    for (var i = 0, len = input.length; i < len; i++)
    {
      label = input[i][0];
      path = input[i][1];
      type = input[i][2];
      if (filter != -1 && type != filter)
        continue;
      // Append type name for ambiguities:
      if (filter == -1 && type && type_name[type])
        if (input[i-1] && input[i-1][0] == label || input[i+1] && input[i+1][0] == label)
          label += ' (' + type_name[type] + ')';
      var a = document.createElement("a");
      a.href = workingDir + path;
      a.setAttribute("tabindex", "-1");
      if (isIE8)
        a.innerHTML = label;
      else
      {
        a.setAttribute("data-content", label);
        a.setAttribute("aria-label", label);
      }
      output += a.outerHTML;
    }
    return output;
  };
  self.modify = function() { // Modify the elements of the index tab.

    if (!retrieveData(self.dataPath, "index_data", "indexData", self.modify))
      return;
    if (!retrieveData(translate.dataPath, "translate_data", "translateData", self.modify))
      return;

    var $index = $('#left div.index');
    var $indexSelect = $index.find('.select select');
    var $indexInput = $index.find('.input input');
    var $indexList = $index.find('div.list');

    // --- Hook up events ---

    // Filter list on change:
    $indexSelect.on('change', function(e) {
      cache.set('index_filter', this.value);
      if(this.value == -1)
        $(this).addClass('empty');
      else
        $(this).removeClass('empty');
      $indexList.html(self.create(cache.index_data, this.value));
      structure.addEventsForListBoxItems($indexList);
    });

    // Select closest index entry and show color indicator on input:
    $indexInput.on('keyup input', function(e, noskip) {
      var $this = $(this);
      var prevInput = cache.index_input; // defaults to undefined
      var input = cache.set('index_input', $this.val().toLowerCase());
      // if no input, remove color indicator and return:
      if (!input) {
        $this.removeAttr('class');
        return;
      }
      // Skip subsequent index-matching if we have the same query as the last search, to prevent double execution:
      if (!noskip && input == prevInput)
        return;
      // Otherwise find the first item which matches the input value:
      var indexListChildren = $indexList.children();
      var match = self.findMatch(indexListChildren, input);
      // Select the found item, scroll to it and add color indicator:
      if (match.length) {
        match.click();
        // Scroll to 5th item below the match to improve readability:
        scrollTarget = match.next().next().next().next().next();
        if (!scrollTarget.length) { scrollTarget = indexListChildren.last(); };
        scrollTarget[0].scrollIntoView(false);
        $this.attr('class', 'match'); // 'items found'
      }
      else
        $this.attr('class', 'mismatch'); // 'items not found'
    });
    $indexSelect.val(cache.index_filter).trigger('change');
    self.preSelect($indexList, $indexInput);
    if (!isFrameCapable || cache.index_input)
      $(document).ready(function() {
        setTimeout( function() { self.preSelect($indexList, $indexInput); }, 0);
      });
  };
  self.findMatch = function(indexListChildren, input) {
    var match = {};
    if (!input)
      return match;
    for (var i = 0; i < indexListChildren.length; i++) {
      var text = isIE8 ? indexListChildren[i].innerText : indexListChildren[i].getAttribute('data-content');
      var listitem = text.substr(0, input.length).toLowerCase();
      if (listitem == input) {
        match = indexListChildren.eq(i);
        break;
      }
    }
    return match;
  };
  self.preSelect = function($indexList, $indexInput) { // Apply stored settings.
    var clicked = $indexList.children().eq(cache.index_clickItem);
    $indexInput.val(cache.index_input);
    if (cache.index_scrollPos == null)
      $indexInput.trigger('keyup', true);
    else
    {
      $indexList.scrollTop(cache.index_scrollPos);
      clicked.click();
    }
  };
}

// --- Constructor: Full text search ---

function ctor_search()
{
  var self = this;
  self.dataPath = scriptDir + '/source/data_search.js';
  self.modify = function() { // Modify the elements of the search tab.

    if (!retrieveData(self.dataPath, "search_index", "SearchIndex", self.modify))
      return;
    if (!retrieveData(self.dataPath, "search_files", "SearchFiles", self.modify))
      return;
    if (!retrieveData(self.dataPath, "search_titles", "SearchTitles", self.modify))
      return;

    var $search = $('#left div.search');
    var $searchList = $search.find('div.list');
    var $searchInput = $search.find('.input input');
    var $searchCheckBox = $search.find('.checkbox input');

    // --- Hook up events ---

    // Refresh the search list and show color indicator on input:
    $searchInput.on('keyup input', function(e, noskip) {
      var $this = $(this);
      var prevInput = cache.search_input; // defaults to undefined
      var input = cache.set('search_input', $this.val());
      // if no input, empty the search list, remove color indicator and return:
      if (!input) {
        $searchList.empty();
        $this.removeAttr('class');
        return;
      }
      // Skip subsequent search if we have the same query as the last search, to prevent double execution:
      if (!noskip && input == prevInput)
        return;
      // Otherwise fill the search list:
      cache.set('search_data', self.create(input));
      $searchList.html(cache.search_data);
      structure.addEventsForListBoxItems($searchList);
      // Select the first item and add color indicator:
      var searchListChildren = $searchList.children();
      if (searchListChildren.length) {
        searchListChildren.first().click();
        cache.set('search_clickItem', 0);
        $this.attr('class', 'match'); // 'items found'
      }
      else
        $this.attr('class', 'mismatch'); // 'items not found'
    });
    self.preSelect($searchList, $searchInput, $searchCheckBox);
    if (!isFrameCapable)
      setTimeout( function() { self.preSelect($searchList, $searchInput, $searchCheckBox); }, 0);
  };
  self.preSelect = function($searchList, $searchInput, $searchCheckBox) { // Apply stored settings.
    $searchInput.val(cache.search_input);
    if (cache.search_scrollPos == null)
      $searchInput.trigger('keyup', true);
    else
    {
      $searchList.html(cache.search_data);
      structure.addEventsForListBoxItems($searchList);
      $searchList.scrollTop(cache.search_scrollPos);
      $searchList.children().eq(cache.search_clickItem).click();
    }
    $searchCheckBox.prop('checked', cache.search_highlightWords);
  };
  self.convertToArray = function(SearchText) { // Convert text to array.
    // Normalize whitespace:
    SearchText = SearchText.toLowerCase().replace(/^ +| +$| +(?= )|\+/, '');
    if (SearchText == '')
      return '';
    else // split and remove undefined or empty strings
      return $(SearchText.split(' ')).filter(function(){return (!!this)});
  }
  self.highlightWords = function(words) {
    var content = $(isInsideFrame ? 'body' : '#right .area');
    if(words)
    {
      var qry = self.convertToArray(words);
      for (var i = 0; i < qry.length; i++) {
        content.highlight(qry[i]);
      }
      self.scrollToMatch(); // Scroll to first match.
    }
    else
      content.removeHighlight();
  }
  self.scrollToMatch = function(direction) {
    var matches = $(isInsideFrame ? 'body' : '#right .area').find('span.search_highlight');
    if (!matches.length)
      return;
    var currMatch = matches.filter('.current');
    if (currMatch.length)
    {
      index = matches.index(currMatch) + (direction == 'next' ? 1 : -1);
      if (index > matches.length - 1)
        index = 0;
      else if (index < 0)
        index = matches.length - 1;
      currMatch.removeClass('current');
    }
    else
      index = 0;
    matches.eq(index).addClass('current');
    matches.eq(index)[0].scrollIntoView(isIE8 ? true : {block: 'center'});
  }
  self.create = function(qry) { // Create search list.
    var PartialIndex = {};
    var RESULT_LIMIT = 50;
    qry = self.convertToArray(qry);
    if (qry == '')
      return

    function file_has_all_words(file_index, words, start) {
      for ( ; start < words.length; ++start) {
        var iw = index_partial(words[start])
        if (!iw || iw.indexOf(file_index) == -1)
          return false
      }
      return true
    }

    // Get each word from index and clone for modification below:
    var all_results = []
    for (var i = 0; i < qry.length; ++i) {
      var t = qry[i].replace(/(\(|\(\))$/,'') // special case for page names ending with ()
      var w = index_partial(t)
      w = w ? w.slice() : []
      all_results[i] = get_results(w)
    }
    var ranked = rank_results(all_results,qry)
    return append_results(ranked);

    // Get normal results for each term:
    function get_results(w) {
      var c = 0
      var ret = []
      for (var i = 0; i < w.length && c < RESULT_LIMIT; ++i) {
        if (!file_has_all_words(w[i], qry, 1))
          continue // Skip files which don't have all the words.
        c++
        var f = cache.search_files[w[i]]
        // data.files excludes '.htm' to save space, so add it back:
        if (f.indexOf('#') != -1)
          f = f.replace('#', '.htm#')
        else
          f = f + '.htm'
        // var ret_i = { u: location.href.replace(/\/docs\/.*/, "/docs/" + f),
        var ret_i = { u: f,
              t: (cache.search_titles[w[i]] || f) }
        ret.push(ret_i)
      }
      return ret
    }

    function rank_results(aro,terms) {
      // Organize the info:
      var aro_k = []
      var aro_ua = []
      var aro_ka = []
      for (var i = 0; i < aro.length; ++i) {
        aro_k[i] = []
        if (aro[i] === undefined) { continue; }
        for (var j = 0; j < aro[i].length; ++j) {
          aro_k[i].push(aro[i][j].t)
          aro_ka.push(aro[i][j].t)
          aro_ua[aro[i][j].t] = aro[i][j].u
        }
      }

      // Assemble list of unique results:
      var ukeys = []
      for (var i = 0; i < aro_ka.length; ++i)
        if (ukeys.indexOf(aro_ka[i]) == -1)
          ukeys.push(aro_ka[i])

      // The lower the rank the better
      // normal ranking (based on page contents):
      var uranks = []
      for (var i = 0; i < ukeys.length; ++i) {
        uranks[ukeys[i]] = []
        for (var j = 0; j < aro_k.length; ++j) {
          uranks[ukeys[i]][j] = ukeys[i].indexOf(aro_k[j])
        }
      }
      // Added ranking (based on page names)
      // and calculate the ranks:
      for (var i = 0; i < ukeys.length; ++i){
        var name = ukeys[i]
        var tmp = uranks[name]
        // If the name contains any of the search terms:
        if ( anyContains(name.toLowerCase(),terms) ) {
          tmp.push(0) // Give it a better rank.
        } else {
          tmp.push(1,8) // Give it a worse rank, Tweakable!
        }
        uranks[name] = array_avg(tmp)
      }

      // Sort results by rank average and finalize:
      var ret = []
      for (var i = 0; i < ukeys.length; ++i){
        var name = ukeys[i]
        var url = aro_ua[name]
        var avg = uranks[name]
        ret.push({n:name,u:url,a:avg})
      }
      ret.sort(function(a,b){return (a.a - b.a)})
      ret.slice(0,RESULT_LIMIT)

      return ret
    }

    function array_avg(arr) {
      var sum = 0
      var total = arr.length
      for (var j = 0; j < arr.length; ++j){
        if ( (arr[j] < 0) || (arr[j-1] == arr[j]) )
          total -= 1 // Give a worse rank, duplicate ranks are ignored.
        else
          sum += arr[j]
      }
      return (sum/total)
    }

    function anyContains(str, arr) { // http://stackoverflow.com/a/5582640/883015
      for (var i = 0, len = arr.length; i < len; ++i) {
        if (str.indexOf(arr[i]) != -1)
          return 1
      }
      return 0
    }

    function append_results(ro) {
      var output = '';
      for (var t = 0; t < ro.length && t < RESULT_LIMIT; ++t) {
        var a = document.createElement("a");
        a.href = workingDir + ro[t].u;
        a.setAttribute("tabindex", "-1");
        if (isIE8)
          a.innerHTML = ro[t].n;
        else
        {
          a.setAttribute("data-content", ro[t].n);
          a.setAttribute("aria-label", ro[t].n);
        }
        output += a.outerHTML;
      }
      return output;
    }

    function decode_numbers(a) {
      // Decode a string of [a-zA-Z] based 'numbers'
      var n = []
      for (i = 0; i < a.length; i += 2)
        n.push(decode_number(a.substr(i, 2)))
      return n
    }

    function decode_number(a) {
      // Decode a number encoded by encode_number() in build_search.ahk:
      var n = 0, c
      for (var i = 0; i < a.length; ++i) {
        c = a.charCodeAt(i)
        n = n*52 + c - ((c >= 97 && c <= 122) ? 97 : 39)
      }
      return n
    }

    function index_whole(word) {
      // Return a word from the index, decoding the list of files
      // if it hasn't been decoded already:
      var files = cache.search_index[word]
      if (typeof(files) == "string") {
        files = decode_numbers(files)
        cache.search_index[word] = files
      }
      return files
    }

    function index_partial(word) {
      if (word[0] == '+') // + prefix disables partial matching.
        return index_whole(word.substr(1))
      // Check if we've already indexed this partial word.
      var files = PartialIndex[word]
      if (files !== undefined)
        return files
      // Find all words in search.index which *contain* this word
      // and cache the result.
      files = []
      var files_low = []
      for (iw in cache.search_index) {
        var p = iw.indexOf(word)
        if (p != -1)
          files.push.apply(p == 0 ? files : files_low, index_whole(iw))
      }
      files = files.concat(files_low)
      var unique = []
      for (var i = 0; i < files.length; ++i)
        if (unique.indexOf(files[i]) == -1)
          unique.push(files[i])
      PartialIndex[word] = unique
      return unique
    }
  };
}

// --- Constructor: Navigation structure ---

function ctor_structure()
{
  var self = this;
  self.metaViewport = '<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">';
  self.template = '<div id="head" role="banner"><button onclick="structure.focusContent();" class="skip-nav" data-translate aria-label="data-content" data-content="Skip navigation"></button><div class="h-area"><div class="h-tabs"><ul><li><button data-translate title="Shortcut: ALT+C" aria-label="Content tab" data-content="C̲ontent"></button></li><li><button data-translate title="Shortcut: ALT+N" aria-label="Index tab" data-content="In̲dex"></button></li><li><button data-translate title="Shortcut: ALT+S" aria-label="Search tab" data-content="S̲earch"></button></li></ul></div><div class="h-tools sidebar"><ul><li class="sidebar"><button title="Hide or show the sidebar" data-translate aria-label="title">&#926;</button></li></ul></div><div class="h-tools online"><ul><li class="home"><a href="{0}" title="Go to the homepage" data-translate aria-label="title">&#916;</a></li><li class="language"><button data-translate title="Change the language" data-translate aria-label="title" data-content="en"></button><ul class="dropdown languages selected"><li><a href="#" title="English" aria-label="title" data-content="en"></a></li><li><a href="#" title="Deutsch (German)" data-content="de" aria-label="title"></a></li><li><a href="#" title="&#x65e5;&#x672c;&#x8a9e; (Japanese)" data-content="ja" aria-label="title"></a></li><li><a href="#" title="&#xD55C;&#xAD6D;&#xC5B4 (Korean)" aria-label="title" data-content="ko"></a></li><li><a href="#" title="Português (Portuguese)" data-content="pt" aria-label="title"></a></li><li><a href="#" title="&#x4E2D;&#x6587; (Chinese)" aria-label="title" data-content="zh"></a></li></ul></li><li class="version"><button title="Change the version" data-translate aria-label="title" data-content="v1"></button><ul class="dropdown versions selected"><li><a href="#" title="AHK v1.1" aria-label="title" data-content="v1"></a></li><li><a href="#" title="AHK v2.0" aria-label="title" data-content="v2"></a></li></ul></li><li class="edit"><a href="#" title="Edit this document on GitHub" data-translate=2 aria-label="title" data-content="E"></a></li></ul></div><div class="h-tools chm"><ul><li class="back"><button title="Go back" data-translate=2 aria-label="title">&#9668;</button></li><li class="forward"><button title="Go forward" data-translate=2 aria-label="title">&#9658;</button></li><li class="zoom"><button title="Change the font size" data-translate=2 aria-label="title" data-content="Z"></button></li><li class="print"><button title="Print this document" data-translate=2 aria-label="title" data-content="P"></button></li><li class="browser"><a href="#" target="_blank" title="Open this document in the default browser (requires internet connection). Middle-click to copy the link address." data-translate aria-label="title">¬</a></li></ul></div><div class="h-tools main visible"><ul><li class="color"><button title="Use the dark or light scheme" data-translate=2 aria-label="title" data-content="C"></button></li><li class="settings"><button title="Open the help settings" data-translate=2 aria-label="title">&#1029;</button></li></ul></div></div></div><div id="main"><div id="left" role="navigation"><div class="tab toc"></div><div class="tab index"><div class="input"><input type="search" placeholder="Search" data-translate=2 /></div><div class="select"><select size="1" class="empty"><option value="-1" class="empty" selected data-translate>Filter</option><option value="0" data-translate>Directives</option><option value="1" data-translate>Built-in Variables</option><option value="2" data-translate>Built-in Functions</option><option value="3" data-translate>Control Flow Statements</option><option value="4" data-translate>Operators</option><option value="5" data-translate>Declarations</option><option value="6" data-translate>Built-in Classes</option><option value="7" data-translate>Built-in Methods/Properties</option><option value="99" data-translate>Ahk2Exe Compiler</option></select></div><div class="list"></div></div><div class="tab search"><div class="input"><input type="search" placeholder="Search" data-translate=2 /></div><div class="checkbox"><input type="checkbox" id="highlightWords"><label for="highlightWords" data-translate>Highlight keywords</label><div class="updown" title="Go to previous/next occurrence" data-translate aria-label="title"><div class="up"><div class="triangle-up"></div></div><div class="down"><div class="triangle-down"></div></div></div></div><div class="list"></div></div><div class="load"><div class="lds-dual-ring"></div></div><div class="quick"><button class="header" title="Collapse or uncollapse the quick reference" data-translate aria-label="title"><div class="chevron"></div><span data-translate data-content="Quick reference"></span></button><div class="main"></div></div></div><div class="dragbar"></div><div id="right" tabIndex="-1"><div class="load"><div class="lds-dual-ring"></div></div><iframe class="hidden" frameBorder="0" id="frame" src="" role="main">';
  self.build = function() { // Write HTML before DOM is loaded to prevent flickering.
    var template = self.template;
    template = template.format(location.protocol + '//' + location.host);
    if (isIE)
    {
      template = template.replace('<div id="right" tabIndex="-1"><div class="load"><div class="lds-dual-ring"></div></div>', '<div id="right" tabIndex="-1">');
      if (isIE8 || isIE9)
      {
        template = template.replace('<div class="quick"><button class="header" title="Collapse or uncollapse the quick reference" data-translate aria-label="title"><div class="chevron"></div><span data-translate data-content="Quick reference"></span></button><div class="main"></div></div>', '');
      }
      if (isIE8)
         template = template.replace(/ data-content="(.*?)">/g, '>$1');
    }
    if (!isFrameCapable)
      template = template.replace('<iframe class="hidden" frameBorder="0" id="frame" src="" role="main">', '<div class="area" role="main">');
    if (isIE)
      template = template.replace('<iframe class="hidden"', '<iframe class="visible"');
    document.write(template);
  };
  self.modify = function() { // Modify elements added via build.

    // --- If phone, hide and overlap sidebar ---

    if (isPhone) { self.displaySidebar(false); $('#left').addClass('phone') }

    // --- 100% tab contents height in IE8 and IE9 (used to disable the quick ref) ---

    if (isIE8 || isIE9)
    {
      var tabs = document.querySelectorAll('#left .tab');
      for (var i = 0; i < tabs.length; i++)
        tabs[i].className += ' no-quick';
    }

    // --- Wait for translation data ---

    if (!retrieveData(translate.dataPath, "translate_data", "translateData", self.modify))
      return;

    // --- Add events ---

    self.saveCacheBeforeLeaving();
    self.addShortcuts();
    self.addAnchorFlash();
    if (!isFrameCapable)
      self.setKeyboardFocus();
    if (supportsHistory) {
      self.saveSiteStateBeforeLeaving();
      self.scrollToPosOnHashChange();
      self.saveScrollPosOnScroll();
    }

    // --- Translate elements with data-translate attribute (value 1 for content only, 2 for attributes only) ---

    $('#head').add($('#left')).find('*[data-translate]').each(function() {
      var $this = $(this);
      var elContent = $this.text();
      var attrTitleValue = $this.attr('title');
      var attrPlaceholder = $this.attr('placeholder');
      var attrAriaLabelValue = $this.attr('aria-label');
      var attrDataContentValue = $this.attr('data-content');
      var attrDataTranslateValue = $this.attr('data-translate');
      if(!attrDataTranslateValue || attrDataTranslateValue == 1)
      {
        if(elContent != '')
          $this.text(T(elContent));
        if(typeof attrDataContentValue !== 'undefined')
          $this.attr('data-content', T(attrDataContentValue));
      }
      if(!attrDataTranslateValue || attrDataTranslateValue == 2)
      {
        if(typeof attrTitleValue !== 'undefined')
          $this.attr('title', T(attrTitleValue));
        if (typeof attrPlaceholder !== 'undefined')
          $this.attr('placeholder', T(attrPlaceholder));
      }
      if (attrAriaLabelValue)
      {
        var value = $this.attr(attrAriaLabelValue);
        $this.attr("aria-label", T(value || attrAriaLabelValue));
      }
    });

    // --- Show/Hide selection lists on click ---

    $('#head .h-tools li:has(.dropdown)').on('click', function() {
      $this = $(this);
      $dropdown = $this.children('.dropdown');
      $('#head .h-tools .dropdown').not($dropdown).animate({height: 'hide'}, 100);
      $('#head .h-tools li').not($this).removeClass('selected');
      $dropdown.animate({height: 'toggle'}, 100);
      $this.toggleClass('selected');
    });

    // --- Main tools (always visible) ---

    var $main = $('#head .h-tools.sidebar').add('#head .h-tools.main');
    $main.find('li.sidebar').on('click', function() {
      self.displaySidebar(!cache.displaySidebar);
    });
    $main.find('li.settings').on('click', function() {
      structure.openSite(scriptDir + '/../settings.htm');
    });
    $main.find('li.color').on('click', function() {
      if (cache.colorScheme == 'dark'
      || (cache.colorScheme == null && window.matchMedia('(prefers-color-scheme: dark)').matches))
        cache.set('colorScheme', 'light');
      else
        cache.set('colorScheme', 'dark');
      structure.setScheme(cache.colorScheme);
      if (isFrameCapable)
        postMessageToFrame('setScheme', [cache.colorScheme]);
    });

    // --- Online tools (only visible if help is not CHM) ---

    var $online = $('#head .h-tools.online');
    // Set language code and version:
    var lang = T("en"), ver = T("v1");
    // language links. Keys are based on ISO 639-1 language name standard:
    var link = { 'v1': { 'en': 'https://www.autohotkey.com/docs/v1/',
                         'de': 'https://ahkde.github.io/docs/v1/',
                         'ko': 'https://ahkscript.github.io/ko/docs/',
                         'pt': 'https://ahkscript.github.io/pt/docs/',
                         'zh': 'https://wyagd001.github.io/zh-cn/docs/' },
                 'v2': { 'en': 'https://www.autohotkey.com/docs/v2/',
                         'de': 'https://ahkde.github.io/docs/v2/',
                         'ja': 'https://ahkscript.github.io/ja/docs/v2/',
                         'zh': 'https://wyagd001.github.io/v2/docs/' } }

    var $langList = $online.find('ul.languages')
    var $verList = $online.find('ul.versions')

    self.modifyTools = function(relPath, equivPath) {
      // Bug - IE/Edge doesn't turn off list-style if element is hidden:
      $langList.add($verList).css("list-style", "none");
      // Hide currently selected language and version in the selection lists:
      $(isIE8 ? 'a:contains(' + lang + ')' : 'a[data-content=' + lang + ']', $langList).parent().hide();
      $(isIE8 ? 'a:contains(' + ver + ')' : 'a[data-content=' + ver + ']', $verList).parent().hide();
      // Add the language links:
      $langList.find('li').each( function() {
        var a = $(this).find('a');
        var thisLink = link[ver][isIE8 ? a.text() : a.attr('data-content')];
        if (thisLink == null)
          $(this).hide(); // Hide language button
        else
          a.attr('href', thisLink + relPath);
      });
      // Add the version links:
      $verList.find('li').each( function() {
        var a = $(this).find('a');
        var ver = isIE8 ? a.text() : a.attr('data-content');
        var thisLink = link[ver][lang];
        // Fallback to default docs:
        thisLink = (thisLink == null) ? link[ver]['en'] : thisLink;
        a.attr('href', thisLink + (equivPath || relPath));
      });
      // Hide dropdown list on click with left or middle mouse button:
      registerEvent($langList.add($verList), 'mouseup', '', function(e) {
        if (e.which == 1 || e.which == 2) {
          setTimeout(function() {
            $dropdown.animate({height: 'hide'}, 100);
            $this.removeClass('selected');
          }, 200);
        }
      });
      // 'Edit page on GitHub' button:
      $("li.edit > a").attr({
        href: T("https://github.com/Lexikos/AutoHotkey_L-Docs/edit/v1/docs/") + relPath,
        target: "_blank"
      });

      // --- CHM tools (only visible if help is CHM) ---

      var $chm = $('#head .h-tools.chm');
      // 'Go back' button:
      registerEvent($chm.find('li.back'), 'click', '', function() { history.back(); });
      // 'Go forward' button:
      registerEvent($chm.find('li.forward'), 'click', '', function() { history.forward(); });
      // 'Zoom' button:
      registerEvent($chm.find('li.zoom'), 'click', '', function() {
        cache.set('fontSize', cache.fontSize + 0.2);
        if (cache.fontSize > 1.4)
          cache.set('fontSize', 0.6);
        $('#frame').contents().find('body').css('font-size', cache.fontSize + 'em');
      });
      // 'Print' button:
      registerEvent($chm.find('li.print'), 'click', '', function() { window.parent.document.getElementById('frame').contentWindow.document.execCommand('print', false, null); });
      // 'Open in default browser' button:
      btn = $chm.find('li.browser > a').attr('href', link[ver][lang] + relPath);
      registerEvent(btn, 'mouseup', '', function(e) {
        if (e.which == 2) {
          window.clipboardData.setData('Text', this.href);
        }
      });

      // --- If help is CHM, show CHM tools, else show online tools ---

      (isInsideCHM) ? $chm.show().addClass('visible') : $online.show().addClass('visible');
    };
    self.modifyTools(relPath, equivPath);

    // --- Apply click events for sidebar tabs ---

    registerEvent($('#head div.h-tabs'), 'click', 'li', function() {
      self.showTab($(this).index());
    });

    // --- Apply events for navbar's quick reference ---

    if (!isIE8 && !isIE9)
    {
      $quick_header = $('#left .quick .header');
      $quick_main = $('#left .quick .main');
      registerEvent($quick_header, 'click', function() {
        self.collapseQuickRef(!cache.collapseQuickRef);
      });
      registerEvent($quick_main, 'click', 'li > span', function() {
        self.openSite($(this).children('a').attr('href'));
        structure.focusContent();
        return false;
      });
      if (!isTouch) {
        $quick_main.addClass('no-scroll');
        registerEvent($quick_main, 'mouseenter', function() {
          $(this).removeClass('no-scroll');
        });
        registerEvent($quick_main, 'mouseleave', function() {
          $(this).addClass('no-scroll');
        });
      }
    }

    // --- Apply control events ---

    var Edit = $('#left .input input');
    var ListBox = $('#left div.list');

    // Store current scrollbar position on scroll:
    ListBox.on('scroll', function() {
      var $this = $(this);
      var $parent = $this.parent();
      cache.set($parent.attr('class') + '_scrollPos', $this.scrollTop());
    });

    // Provide ListBox functionality and interaction with the Edit on keypress:
    function processKeys($ListBox, keyCode) {
      var $clicked = $ListBox.find('a.selected');
      switch(keyCode) {
        case 9: // Tab
        return;

        case 13: // Enter. See keyup event below.
        break;

        case 33: // Page Up
        case 34: // Page Down
        var n = Math.floor($ListBox.height() / $ListBox.children().first().outerHeight());
        var direction = keyCode == 33 ? 'prevAll' : 'nextAll';
        if ($clicked[direction]().length < n)
          $ListBox.children()[keyCode == 33 ? 'first' : 'last']().click().focus();
        else
          $clicked[direction]().eq(n).click();
        break;

        case 35: // End
        case 36: // Home
        $ListBox.children()[keyCode == 35 ? 'last' : 'first']().click().focus();
        break;

        case 38: // Up
        case 40: // Down
        $clicked[keyCode == 38 ? 'prev' : 'next']().click().focus();
        break;

        default:
          $ListBox.siblings('div.input').children('input').focus().select(); // Redirect other keys to Edit
        return;
      }
      return false; // Prevent the default action (scroll / move caret).
    }
    ListBox.on('keydown', function(e) { return processKeys($(this), e.which); });
    // If Enter would trigger keydown, it would also trigger
    // the Edit's keyup event after opening the new site.
    ListBox.on('keyup', function(e) {
      var $this = $(this);
      if (e.which == 13) // Enter
        $this.children('a.selected').trigger('dblclick'); // Open the link
      return false;
    });

    // Provide interaction with the ListBox on keypress:
    Edit.on('keydown', function(e) {
      var $ListBox = $(this).parent().siblings('div.list');
      switch(e.which) {
        case 13: // Enter
          $ListBox.children('a.selected').trigger('dblclick');
        break;

        case 33:
        case 34:
        case 38:
        case 40:
          $ListBox.children('a.selected').focus();
          processKeys($ListBox, e.which);
        break;

        default:
        return;
      }
      return false; // Prevent the default action (scroll / move caret).
    });

    // Highlight search words on check:
    $('#left .checkbox input#highlightWords').on('change', function() {
      if(this.checked)
      {
        cache.set('search_highlightWords', true);
        if(isFrameCapable)
          postMessageToFrame('highlightWords', [cache.search_input]);
        else
          search.highlightWords(cache.search_input);
      }
      else
      {
        cache.set('search_highlightWords', false);
        if(isFrameCapable)
          postMessageToFrame('highlightWords', []);
        else
          search.highlightWords('');
      }
    });

    $('#left .checkbox .up').on('click', function() {
      if (isFrameCapable)
        postMessageToFrame('scrollToMatch', ['prev']);
      else
        search.scrollToMatch('prev');
    });

    $('#left .checkbox .down').on('click', function() {
      if (isFrameCapable)
        postMessageToFrame('scrollToMatch', ['next']);
      else
        search.scrollToMatch('next');
    });

    // --- Apply stored values ---

    self.showTab(cache.clickTab);
    self.displaySidebar(cache.displaySidebar);
    self.collapseQuickRef(isIE8 || isIE9 ? true : cache.collapseQuickRef);

    // --- Resize the sidebar's width via mouse ---

    var dragging = false;
    $('.dragbar').mousedown(function(e) {
      e.preventDefault();
      dragging = true;
      $('#frame').hide(); // Prevent the mouse events from being interrupted.
      var ghostbar = $('<div>', {'class': 'ghostbar', 'css': {left: $('#left').width()+2}});
      ghostbar.appendTo('body');
      $(document).mousemove(function(e) { ghostbar.css("left", e.pageX+2); });
    });

    $(document).mouseup(function(e) {
      if (dragging) 
      {
        cache.set('sidebarWidth', e.pageX+2);
        $('#left').add('#head div.h-tabs').width(cache.sidebarWidth);
        $('div.dragbar').css('left', cache.sidebarWidth);
        $('#frame').fadeIn();
        $('div.ghostbar').remove();
        $(document).unbind('mousemove');
        dragging = false;
      }
    });
  };
  // Display or hide the sidebar:
  self.displaySidebar = function(display) {
    cache.set('displaySidebar', display);
    var $headTabs = $('#head div.h-tabs');
    var $leftArea = $('#left');
    var $dragbar = $('.dragbar');
    var $hTools = $('#head div.h-tools.visible');
    var hide = {width: 0, visibility: "hidden"};
    var show = {width: cache.sidebarWidth, visibility: "visible"};
    if (display) {
      $headTabs.css(show);
      $leftArea.css(show);
      $dragbar.show().css('left', cache.sidebarWidth);
      $leftArea.find('div.input input').focus();
      if(isPhone)
        $hTools.hide();
    }
    else {
      $headTabs.css(hide);
      $leftArea.css(hide);
      $dragbar.hide();
      if(isPhone)
        $hTools.show();
    }
  };
  // Show the specified tab:
  self.showTab = function(pos) {
    cache.set('clickTab', pos);
    var $t = $('#head div.h-tabs li');
    var $s = $('#left > div:not(.quick)');
    $t.removeClass('selected')
      .eq(pos).addClass('selected');
    $s.css("visibility", "hidden")
      .eq(pos).css("visibility", "inherit")
      .focus() // To make internal hotkeys work on startup.
      .find('.input input').focus();
  };
  // Collapse navbar's quick reference:
  self.collapseQuickRef = function(collapse) {
    cache.set('collapseQuickRef', collapse);
    var $tab = $('#left .tab');
    var $chevron = $('#left .quick .header .chevron');
    var $main = $('#left .quick .main');
    if (collapse) {
      $tab.removeClass('shrinked').addClass('full');
      $chevron.removeClass('down').addClass('right');
      $main.hide();
    }
    else {
      $tab.removeClass('full').addClass('shrinked');
      $chevron.removeClass('right').addClass('down');
      $main.show();
    }
  };
  // Update navbar's quick reference:
  self.updateQuickRef = function(relPath, h2s) {
    var ul = document.createElement("ul");
    for (var i = 0; i < h2s.length; i++) {
      var h2 = h2s[i];
      var el = document.createElement("a");
      el.href = workingDir + relPath + ((h2.id) ? ('#' + h2.id) : '');
      el.setAttribute("data-content", h2.innerText);
      el.setAttribute("aria-label", h2.innerText);
      var span = document.createElement("span");
      span.innerHTML = el.outerHTML;
      var li = document.createElement("li");
      li.title = h2.innerText;
      li.innerHTML = span.outerHTML;
      ul.innerHTML += li.outerHTML;
    }
    $('#left .quick .main').html(ul);
  };
  // Save cache before leaving site:
  self.saveCacheBeforeLeaving = function() {
    $(window).on('beforeunload', function() {
      cache.set('RightIsFocused', $(document.activeElement).closest('#right, #left > div.toc').length);
      cache.save();
    });
  }
  // Save site state before leaving site:
  self.saveSiteStateBeforeLeaving = function() {
    $(window).on('beforeunload', function() {
      var state = {
        scrollTop: $('#right')[0].scrollTop
      }
      history.replaceState($.extend(history.state, state), null, null);
    });
  }
  // Hide frame before leaving site:
  self.hideFrameBeforeLeaving = function() {
    $(window).on('beforeunload', function() {
      postMessageToParent('hideFrame', []);
    });
  }
  // Focus content:
  self.focusContent = function() {
    if (isFrameCapable) {
      if (isIE || isEdge)
        $(document.getElementById('frame').contentWindow).focus();
      else if (isFirefox)
        setTimeout(function() {$('#frame').get(0).focus();}, 1);
      else
        $('#frame').get(0).focus();
    }
    else
      $('#right').focus();
  }
  // Set keyboard focus at the right place after loading site:
  self.setKeyboardFocus = function() {
    $(window).on('load', function() {
      if (cache.RightIsFocused && !cache.clickTab)
        self.focusContent();
      else
        $('#left').find('.input input').focus();
    });
  }
  // Scroll to right position:
  self.scrollToPosOnHashChange = function() {
    $(window).on('hashchange', function() {
      if (history.state)
        document.getElementById('right').scrollTop = history.state.scrollTop;
    });
  }
  // Save scroll position of the right pane on scroll:
  self.saveScrollPosOnScroll = function() {
    if (!history.state) // To have scrolling to top by default.
      history.replaceState($.extend(history.state, {scrollTop:0}), null, null);
    $('#right').on('scroll', function() {
      history.replaceState($.extend(history.state, {scrollTop:$(this)[0].scrollTop}), null, null);
    });
  }
  // Add shortcuts:
  self.addShortcuts = function() {
    $(document).on("keydown", function(e) {
      if (e.which == 117) {
        self.pressKey("F6");
        return false;
      }
      if (e.altKey) {
        var keyList = ["C", "N", "S"];
        for (var i = 0; i < keyList.length; i++)
          if (e.which == T(keyList[i]).charCodeAt(0)) {
            self.pressKey(keyList[i]);
            return false;
          }
      }
    });
  }
  // Perform action for specified key:
  self.pressKey = function(keyname) {
    if (isInsideFrame) {
      postMessageToParent('pressKey', [keyname]);
    }
    else {
      switch(keyname) {
        case "C":
        structure.showTab(0); // Content tab
        break;
  
        case "N":
        structure.showTab(1); // Index tab
        break;
  
        case "S":
        structure.showTab(2); // Search tab
        break;
  
        case "F6": // Move focus between left and right area
        if ($(document.activeElement).closest('#right').length)
          $('#left > div').eq(cache.clickTab).children().find(':input, [tabindex="0"]').eq(0).focus();
        else
          structure.focusContent();
        break;
      }
    }
  }
  // Flash anchor on page load and anchor change:
  self.addAnchorFlash = function() {
    $(window).on('load hashchange', function() {
      if (location.hash)
        anchor = document.getElementById(location.hash.slice(1));
      else
        return;
      $(anchor).removeClass('anchor_transition').addClass('anchor_highlight');
      setTimeout( function() {
        $(anchor).addClass('anchor_transition').removeClass('anchor_highlight');
      }, 200);
    });
  }
  // Open new site:
  self.openSite = function(url) {
    if (isFrameCapable) {
      cache.set('toc_clickItemTemp', cache.toc_clickItem);
      document.getElementById('frame').contentWindow.location.href = url;
      cache.save();
      if (isPhone)
        setTimeout(function() { self.displaySidebar(false); }, 200);
    }
    else {
      if (isPhone) {
        cache.set('displaySidebar', false);
        setTimeout(function() {
          self.displaySidebar(false);
          if (location.hash)
            $(location.hash)[0].scrollIntoView();
        }, 200);
      }
      window.location = url;
    }
  }
  // Set color scheme:
  self.setScheme = function(scheme) {
    $('#dark_css').remove();
    if (scheme == 'dark' || scheme == null)
    {
      var link = document.createElement('link');
      link.href = workingDir + 'static/dark.css';
      link.rel = 'stylesheet';
      link.type = 'text/css';
      link.id = 'dark_css';
      if (scheme == null)
        link.media = '(prefers-color-scheme: dark)';
      $('head').append(link);
    }
  };
  // Add events for ListBox items such as double-click:
  self.addEventsForListBoxItems = function(ListBox) {
    // Select the item on click and scroll to it:
    registerEvent(ListBox, 'click', '> a', function() {
      var $this = $(this);
      var $parent = $this.parent();
      // Scroll the item into view:
      if (!isScrolledIntoView($this, $parent)) {
        var half = ($parent.height() + $parent.offset().top) / 2;
        if ($this.offset().top > half)
          $this[0].scrollIntoView(false); // Move down
        else
          $this[0].scrollIntoView(); // Move up
      }
      // Select the item:
      $this.siblings('a.selected').removeClass('selected').attr('tabindex', -1);
      $this.addClass('selected').attr('tabindex', 0);
      return false;
    });
    // Open the link on double-click or touch (for mobile) and store its index
    // relative to its parent:
    var touchmoved;
    registerEvent(ListBox, 'dblclick touchend', '> a', function() {
      if (touchmoved != true) {
        var $this = $(this);
        var $parent = $this.parent();
        var $grandparent = $parent.parent();
        // Store the item's index relative to its parent:
        var className = $grandparent.attr('class');
        cache.set(className + '_clickItem', $this.index());
        self.openSite($this.attr('href'));
      }
    });
    registerEvent(ListBox, 'touchmove', '> a', function() {
      touchmoved = true;
    });
    registerEvent(ListBox, 'touchstart', '> a', function() {
      touchmoved = false;
    });
    // Show tooltip on mouseover if an item exceeds the length of its parent:
    registerEvent(ListBox, 'mouseenter', '> a', function() {
      var $this = $(this);
      if (this.offsetWidth < this.scrollWidth && !$this.attr('title')) {
        $this.attr('title', isIE8 ? $this.text() : $this.attr('data-content'));
      }
    });
  }
}

// --- Modify elements provided by the HTML site ---

function ctor_features()
{
  var self = this;
  self.add = function() {
    if (!retrieveData(translate.dataPath, "translate_data", "translateData", self.add))
      return;
    self.content = document.querySelectorAll('#right .area, #right body')[0];
    $.queueFunc.add(self.modifyTables);
    $.queueFunc.add(self.modifyHeaders);
    $.queueFunc.add(self.gatherHeadingsForQuickRef);
    $.queueFunc.add(self.modifyExternalLinks);
    $.queueFunc.add(self.modifyDeprecatedLinks);
    $.queueFunc.add(self.modifyVersions);
    $.queueFunc.add(self.modifyCodeBoxes);
    self.addFooter();
    $.queueFunc.add(self.addBackButton);
    self.scrollToPos();
    $.queueFunc.add(self.highlightWords);
  };

  // --- Responsive tables (mobile) ---

  self.modifyTables = function() {
    if (!isPhone)
      return;
    var tables = self.content.querySelectorAll('table.info');
    for(var i = 0; i < tables.length; i++) {
      var table = tables[i], th = {}, newTable = "";
      var id = table.getAttribute('id');
      newTable += (id) ? '<table id="'+id+'"' : '<table';
      newTable += ' class="mobile">';
      var trs = table.querySelectorAll('tr');
      for(var j = 0; j < trs.length; j++) {
        var tr = trs[j];
        ths = tr.querySelectorAll('th');
        if (ths.length) {
          th = ths; continue;
        }
        var id = tr.getAttribute('id');
        newTable += (id) ? '<tbody id="'+id+'">' : '<tbody>';
        var tds = tr.querySelectorAll('td');
        if (tr.querySelectorAll('td[rowspan], td[colspan]').length)
          for (var k = 0; k < tds.length; k++)
          {
            var td = tds[k];
            var rowspan = td.getAttribute('rowspan');
            var colspan = td.getAttribute('colspan');
            if (rowspan)
              for (var l = 1; l < rowspan; l++)
                trs[j + l].insertCell(k).innerHTML = td.innerHTML;
            if (colspan)
            {
              for (var l = 1; l < colspan; l++)
                tr.insertCell(k + l).innerHTML = td.innerHTML;
              tds = tr.querySelectorAll('td');
            }
          }
        for(var k = 0; k < tds.length; k++) {
          var td = tds[k];
          var id = td.getAttribute('id');
          newTable += (id) ? '<tr id="'+id+'">' : '<tr>';
          var first = (th.length) ? (th[k].abbr || th[k].innerHTML) : "";
          newTable += '<td>'+first+'</td><td>'+td.innerHTML+'</td></tr>';
        }
        newTable += '</tbody>';
      }
      newTable += '</table>';
      table.outerHTML = newTable;
    }
  };

  // --- Generate anchors for anchor-less head lines ---

  self.modifyHeaders = function() {
    if (isInsideCHM)
      return;
    var hs = self.content.querySelectorAll('h2, h3, h4, h5, h6');
    for(var i = 0; i < hs.length; i++) {
      var h = hs[i];
      var id = h.getAttribute('id');
      h.className = h.className + " headLine"; // Apply extra CSS.
      if(!id) // If head line doesn't have anchor...
      {
        // As first child, try to use the id of its parent such as .methodShort:
        if (h.parentNode != self.content && h.parentNode.getAttribute('id') && !$(h).prev().length)
          id = h.parentNode.getAttribute('id');
        // Otherwise, generate an id:
        else
        {
          var text = h.textContent || h.innerText;
          var text = text.replace(/\s/g, '_'); // replace spaces with _
          var text = text.replace(/[():.,;'#\[\]\/{}&="|?!]/g, ''); // remove special chars
          // If anchor exist already, use unique anchor, else use anchor:
          id = (document.getElementById(text)) ? (text + '_' + i) : text;
          h.setAttribute('id', id);
          // Jump to the head line if the user hasn't scrolled the page yet:
          if(id == location.hash.substr(1) && !$("html, body").scrollTop())
            h.scrollIntoView();
        }
      }
      var headLink = '<a class="headLink" href="#' + id + '">';
      var innerHTML = h.innerHTML;
      // Nested links are forbidden, so they must be separated from each other:
      var as = h.querySelectorAll('a');
      for(var n = 0; n < as.length; n++) {
        var a = as[n].outerHTML;
        innerHTML = innerHTML.replace(a, '</a>' + a + headLink);
      }
      h.innerHTML = headLink + innerHTML + '</a>';
    }
  };

  // --- Gather headings to show them in the navbar's quick reference ---

  self.gatherHeadingsForQuickRef = function() {
    if (isIE8 || isIE9)
      return;
    var hs = self.content.querySelectorAll('h2');
    var list = [];
    for (var i = 0; i < hs.length; i++) {
      var h = hs[i].cloneNode(true);
      $(h).find('.ver, .headnote').remove();
      list.push({id: h.id, innerText: h.innerText});
    }
    postMessageToParent('updateQuickRef', [relPath.replace(window.location.hash, ''), list]);
  };

  // --- Open external links in a new tab/window ---

  self.modifyExternalLinks = function() {
    var as = self.content.querySelectorAll("a[href^='http']");
    for(var i = 0; i < as.length; i++) {
      var a = as[i];
      if (!a.querySelector('img') && a.className.indexOf('no-ext') == -1) {
        a.className = "extLink";
        a.target = "_blank";
      }
    }
  };

  // --- Mark specific links as deprecated ---

  self.modifyDeprecatedLinks = function() {
    if (!retrieveData(deprecate.dataPath, "deprecate_data", "deprecateData", self.modifyDeprecatedLinks))
      return;
    var as = self.content.querySelectorAll("a");
    for (var i = 0; i < as.length; i++) {
      var a = as[i];
      var is_anchor_only = ((a.getAttribute("href") || "").charAt(0) == "#");
      var force_deprecated = (a.className.indexOf("deprecated") != -1);
      if (a.hasAttribute("title"))
        continue;
      if (force_deprecated)
        a.title = T("Deprecated.");
      if (is_anchor_only && !force_deprecated)
        continue;
      var replacement = cache.deprecate_data[getRelativePath(a.href, workingDir)];
      if (replacement) {
        if (!force_deprecated)
          a.className += " deprecated";
        a.title = T("Deprecated. New scripts should use {0} instead.").format(replacement);
      }
    }
  };

  // --- Add links for version annotations ---

  self.modifyVersions = function() {
    var spans = self.content.querySelectorAll("span.ver");
    for(var i = 0; i < spans.length; i++) {
      var span = spans[i], m, title, href;
      var text = span.textContent || span.innerText;
      if (m = /(v\d\.(\d+\.)?\d+)(\+)?/.exec(text)) {
        title = m[3] ? T("Applies to AutoHotkey {0} and later").format(m[1]) : "AutoHotkey {0}".format(m[1]);
        if (!m[2])
          m[1] = m[1] + '.0';
        href = 'ChangeLog.htm#' + m[1];
      } else continue;
      // outerHTML/innerHTML not possible here because IE8 doesn't allow nested links:
      $(span).html('<a href="' + workingDir + href + '" title="' + title + '">' + text + '</a>');
    }
  };

  // --- Add useful features for code boxes ---
  
  self.modifyCodeBoxes = function() {
    var pres = self.content.querySelectorAll("pre, code");
    self.addCodeBoxButtons(pres);
    self.addSyntaxColors(pres);
  };

  // --- Add select and download buttons for code boxes ---

  self.addCodeBoxButtons = function(pres) {
    for (var i = 0; i < pres.length; i++) {
      var pre = pres[i];
      if (pre.tagName == 'CODE')
        continue;
      var isSyntax = (pre.className.indexOf('Syntax') != -1);
      var isNoHighlight = (pre.className.indexOf('no-highlight') != -1);
      var supportsBlob = (typeof Blob != 'undefined');
      var parent = document.createElement('pre'); parent.className = 'parent ' + pre.className;
      if (isSyntax || isNoHighlight)
        pre.className = 'origin no-highlight';
      else
        pre.className = 'origin';
      pre.parentNode.insertBefore(parent, pre);
      parent.appendChild(pre);
      var buttons = document.createElement('div'); buttons.className = 'buttons';
      parent.appendChild(buttons);
      var sel = document.createElement('a');
      sel.className = 'selectCode';
      sel.title = T("Select code");
      if (isIE8)
        sel.innerHTML = 'S';
      else
        sel.setAttribute("data-content", 'S');
      buttons.appendChild(sel);
      if (supportsBlob && !isSyntax && !isNoHighlight) {
        var dwn = document.createElement('a');
        dwn.className = 'downloadCode';
        dwn.title = T("Download code");
        if (isIE8)
          dwn.innerHTML = '↓';
        else
          dwn.setAttribute("data-content", '↓');
        buttons.appendChild(dwn);
      }
      $(parent) // Show these buttons on hover:
        .mouseenter(function() {
          $(this).children('div.buttons').fadeTo(200, 0.8);
        })
        .mouseleave(function() {
          $(this).children('div.buttons').fadeTo(200, 0);
        });
      $(parent).find('div.buttons > a.selectCode') // Select the code on click:
        .on('click', function() {
          var doc = document
            , text = $(this).parent().siblings('pre.origin')[0]
            , range, selection;
          if (doc.body.createTextRange) {
            range = document.body.createTextRange();
            range.moveToElementText(text);
            range.select();
          } else if (window.getSelection) {
            selection = window.getSelection();
            range = document.createRange();
            range.selectNodeContents(text);
            selection.removeAllRanges();
            selection.addRange(range);
          }
        });
      $(parent).find('div.buttons > a.downloadCode') // Download the code on click:
        .on('click', function(e) {
          var pre = $(this).parent().siblings('pre.origin');
          var textToWrite = '\ufeff' + pre.text().replace(/\n/g, "\r\n");
          var textFileAsBlob = new Blob([textToWrite], {type: 'text/csv'});
          var fileNameToSaveAs = pre.attr("filename") || location.pathname.match(/([^\/]+)(?=\.\w+$)/)[0] + "-Script.ahk";

          var downloadLink = document.createElement("a");
          downloadLink.download = fileNameToSaveAs;
          downloadLink.innerHTML = "Download File";

          if (isIE || isEdge) {
            navigator.msSaveBlob(textFileAsBlob, fileNameToSaveAs);
          }
          if (isChrome || isBlink) {
            downloadLink.href = window.webkitURL.createObjectURL(textFileAsBlob);
            downloadLink.click();
          }
          if (isFirefox) {
            downloadLink.href = window.URL.createObjectURL(textFileAsBlob);
            downloadLink.style.display = "none";
            document.body.appendChild(downloadLink);
            downloadLink.click();
          }
        });
    }
  };

  // --- Add syntax highlighting for AutoHotkey code ---

  self.addSyntaxColors = function(pres) {
    var docs_path = scriptDir + '/../';
    if (typeof highlighter == 'undefined')
    {
      if (!retrieveData(index.dataPath, "index_data", "indexData", function() { self.addSyntaxColors(pres); }))
        return;
      loadScript(scriptDir + '/highlighter/highlighter.js', function() { highlighter.addSyntaxColors(pres, cache.index_data, docs_path, false); });
    }
    else
      highlighter.addSyntaxColors(pres, cache.index_data, docs_path, false);
  };

  // --- Add footer at the bottom of the site ---

  self.addFooter = function() {
    var div = document.createElement('div');
    div.className = 'footer';
    div.innerHTML = 'Copyright &copy; 2003-' + new Date().getFullYear() + ' ' + location.host + ' - LIC: <a href="' + scriptDir + '/../license.htm" class="no-ext">GNU GPLv2</a>';
    self.content.appendChild(div);
  };

  // --- Add back-to-top button ---

  self.addBackButton = function() {
    var div = document.createElement('div');
    div.className = 'back-to-top';
    div.title = T('Back to top');
    self.content.appendChild(div);

    var isVisible = false;
    $('#right').add(window).on('scroll', showBackButton); showBackButton();

    $('div.back-to-top').on('click', function() {
      $(document.body).add(document.documentElement).add('#right').animate({scrollTop: 0}, 100);
    });

    function showBackButton() {
      var scrollTop = $(this).scrollTop();
      if (scrollTop > 20 && !isVisible) {
        isVisible = true;
        $('div.back-to-top').fadeIn();
      } else if (scrollTop < 20 && isVisible) {
        isVisible = false;
        $('div.back-to-top').fadeOut();
      }
    }
  };

  // --- Ensure setting right scroll position when traversing history ---

  self.scrollToPos = function() {
    if (supportsHistory && history.state)
      document.getElementById('right').scrollTop = history.state.scrollTop;
  };

  // --- Highlight search words with jQuery Highlight plugin ---

  self.highlightWords = function() {
    if (cache.search_highlightWords && cache.clickTab == 2)
      search.highlightWords(cache.search_input);
  };

}

// --- Get the working directory of the site ---

function getWorkingDir()
{
  var wDir = '';
  var pathArray = scriptDir.split('/');
  for (i = 0; i < pathArray.length - 1; i++)
    wDir += pathArray[i] + "/";
  return wDir;
}

// --- Get relative path ---

function getRelativePath(href, workingDir) {
  if (href.indexOf(workingDir) == 0)
    return href.substring(workingDir.length);
  return href;
}

// --- Check if an element is visible after scrolling ---

function isScrolledIntoView(el, container)
{
  var viewport = {};
  var bounds = el.offset();
  bounds.right = bounds.left + el.outerWidth();
  bounds.bottom = bounds.top + el.outerHeight();
  viewport.bottom = container.height() + container.offset().top;
  return ((container.offset().top < bounds.top) && (viewport.bottom > bounds.bottom));
}

// --- Load scripts dynamically ---

function loadScript(url, callback) {

    var script = document.createElement("script")
    script.type = "text/javascript";

    if (script.readyState){  // IE
        script.onreadystatechange = function() {
            if (script.readyState == "loaded" ||
                    script.readyState == "complete") {
                script.onreadystatechange = null;
                callback();
            }
        };
    } else {  // Others
        script.onload = function() {
            callback();
        };
    }

    script.src = url;
    document.getElementsByTagName("head")[0].appendChild(script);
}

// --- Retrieve data if not already done ---

function retrieveData(path, propName, varName, callback) {
  if (!cache[propName]) {
    loadScript(path, function() {
      cache.set(propName, window[varName]);
      callback();
    });
    return false;
  }
  return true;
}

// --- Use a translation for the given string if available ---

function T(original) {
  translation = cache.translate_data[original];
  if (translation == true) { translation = original; }
  return translation;
}

// --- Enables interaction between frame and parent ---

function postMessageToParent(id, param) {
  param.unshift(id);
  window.parent.postMessage(JSON.stringify(param), '*');
}

function postMessageToFrame(id, param) {
  param.unshift(id);
  document.getElementById('frame').contentWindow.postMessage(JSON.stringify(param), '*');
}

// https://stackoverflow.com/a/21903119
function getUrlParameter(sParam) {
    var sParameterName, i;
    var sPageURL = window.location.search.substring(1);
    var sURLVariables = sPageURL.split('&');
    for (i = 0; i < sURLVariables.length; i++) {
        sParameterName = sURLVariables[i].split('=');

        if (sParameterName[0] === sParam) {
            return sParameterName[1] === undefined ? true : decodeURIComponent(sParameterName[1]);
        }
    }
}

// Similar to $.extend but without adding new properties:
function overwriteProps(a, b) {
  for (var key in b) {
    if (key in a) {
      a[key] = b[key];
    }
  }
  return a;
}

// Prevent event delegation on IE8/Edge to bypass performance issues
// but results in longer initial load time for these browsers:
function registerEvent(el, events, children, func) {
  if (children && (isIE8 || isEdge))
  {
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a,b=n.timers,c=0;for(hb=n.now();c<b.length;c++)a=b[c],a()||b[c]!==a||b.splice(c--,1);b.length||n.fx.stop(),hb=void 0},n.fx.timer=function(a){n.timers.push(a),a()?n.fx.start():n.timers.pop()},n.fx.interval=13,n.fx.start=function(){ib||(ib=a.setInterval(n.fx.tick,n.fx.interval))},n.fx.stop=function(){a.clearInterval(ib),ib=null},n.fx.speeds={slow:600,fast:200,_default:400},n.fn.delay=function(b,c){return b=n.fx?n.fx.speeds[b]||b:b,c=c||"fx",this.queue(c,function(c,d){var e=a.setTimeout(c,b);d.stop=function(){a.clearTimeout(e)}})},function(){var a,b=d.createElement("input"),c=d.createElement("div"),e=d.createElement("select"),f=e.appendChild(d.createElement("option"));c=d.createElement("div"),c.setAttribute("className","t"),c.innerHTML="  <link/><table></table><a href='/a'>a</a><input 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