/* -*- Mode: Javascript; indent-tabs-mode:nil; js-indent-level: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */

/*************************************************************
 *
 *  MathJax/extensions/MathMenu.js
 *
 *  Implements a right-mouse (or CTRL-click) menu over mathematics
 *  elements that gives the user the ability to copy the source,
 *  change the math size, and zoom settings.
 *
 *  ---------------------------------------------------------------------
 *
 *  Copyright (c) 2010-2015 The MathJax Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

(function (HUB,HTML,AJAX,CALLBACK,OUTPUT) {
  var VERSION = "2.6.1";

  var SIGNAL = MathJax.Callback.Signal("menu");  // signal for menu events

  MathJax.Extension.MathMenu = {
    version: VERSION,
    signal: SIGNAL
  };

  var _ = function (id) {
    return MathJax.Localization._.apply(
      MathJax.Localization,
      [["MathMenu",id]].concat([].slice.call(arguments,1))
    );
  };

  var isPC = HUB.Browser.isPC, isMSIE = HUB.Browser.isMSIE, isIE9 = ((document.documentMode||0) > 8);
  var ROUND = (isPC ? null : "5px");

  var CONFIG = HUB.CombineConfig("MathMenu",{
    delay: 150,                                    // the delay for submenus

    showRenderer: true,                            //  show the "Math Renderer" menu?
    showMathPlayer: true,                          //  show the "MathPlayer" menu?
    showFontMenu: false,                           //  show the "Font Preference" menu?
    showContext:  false,                           //  show the "Context Menu" menu?
    showDiscoverable: false,                       //  show the "Discoverable" menu?
    showLocale: true,                              //  show the "Locale" menu?
    showLocaleURL: false,                          //  show the "Load from URL" menu?

    semanticsAnnotations: {
      "TeX": ["TeX", "LaTeX", "application/x-tex"],
      "StarMath": ["StarMath 5.0"],
      "Maple": ["Maple"],
      "ContentMathML": ["MathML-Content", "application/mathml-content+xml"],
      "OpenMath": ["OpenMath"]
    },

    windowSettings: {                              // for source window
      status: "no", toolbar: "no", locationbar: "no", menubar: "no",
      directories: "no", personalbar: "no", resizable: "yes", scrollbars: "yes",
      width: 400, height: 300,
      left: Math.round((screen.width - 400)/2),
      top:  Math.round((screen.height - 300)/3)
    },

    styles: {
      "#MathJax_About": {
        position:"fixed", left:"50%", width:"auto", "text-align":"center",
        border:"3px outset", padding:"1em 2em", "background-color":"#DDDDDD", color:"black",
        cursor: "default", "font-family":"message-box", "font-size":"120%",
        "font-style":"normal", "text-indent":0, "text-transform":"none",
        "line-height":"normal", "letter-spacing":"normal", "word-spacing":"normal",
        "word-wrap":"normal", "white-space":"nowrap", "float":"none", "z-index":201,

        "border-radius": "15px",                     // Opera 10.5 and IE9
        "-webkit-border-radius": "15px",             // Safari and Chrome
        "-moz-border-radius": "15px",                // Firefox
        "-khtml-border-radius": "15px",              // Konqueror

        "box-shadow":"0px 10px 20px #808080",         // Opera 10.5 and IE9
        "-webkit-box-shadow":"0px 10px 20px #808080", // Safari 3 and Chrome
        "-moz-box-shadow":"0px 10px 20px #808080",    // Forefox 3.5
        "-khtml-box-shadow":"0px 10px 20px #808080",  // Konqueror
        filter: "progid:DXImageTransform.Microsoft.dropshadow(OffX=2, OffY=2, Color='gray', Positive='true')" // IE
      },
      "#MathJax_About.MathJax_MousePost": {
        outline:"none"
      },

      ".MathJax_Menu": {
        position:"absolute", "background-color":"white", color:"black",
        width:"auto", padding:(isPC ? "2px" : "5px 0px"),
        border:"1px solid #CCCCCC", margin:0, cursor:"default",
        font: "menu", "text-align":"left", "text-indent":0, "text-transform":"none",
        "line-height":"normal", "letter-spacing":"normal", "word-spacing":"normal",
        "word-wrap":"normal", "white-space":"nowrap", "float":"none", "z-index":201,

        "border-radius": ROUND,                     // Opera 10.5 and IE9
        "-webkit-border-radius": ROUND,             // Safari and Chrome
        "-moz-border-radius": ROUND,                // Firefox
        "-khtml-border-radius": ROUND,              // Konqueror

        "box-shadow":"0px 10px 20px #808080",         // Opera 10.5 and IE9
        "-webkit-box-shadow":"0px 10px 20px #808080", // Safari 3 and Chrome
        "-moz-box-shadow":"0px 10px 20px #808080",    // Forefox 3.5
        "-khtml-box-shadow":"0px 10px 20px #808080",  // Konqueror
        filter: "progid:DXImageTransform.Microsoft.dropshadow(OffX=2, OffY=2, Color='gray', Positive='true')" // IE
      },

      ".MathJax_MenuItem": {
        padding: (isPC ? "2px 2em" : "1px 2em"),
        background:"transparent"
      },

      ".MathJax_MenuArrow": {
        position:"absolute", right:".5em", "padding-top":".25em", color:"#666666",
        "font-family": (isMSIE ? "'Arial unicode MS'" : null), "font-size": ".75em"
      },
      ".MathJax_MenuActive .MathJax_MenuArrow": {color:"white"},
      ".MathJax_MenuArrow.RTL": {left:".5em", right:"auto"},

      ".MathJax_MenuCheck": {
        position:"absolute", left:".7em",
        "font-family": (isMSIE ? "'Arial unicode MS'" : null)
      },
      ".MathJax_MenuCheck.RTL": {right:".7em", left:"auto"},

      ".MathJax_MenuRadioCheck": {
        position:"absolute", left: (isPC ? "1em" : ".7em")
      },
      ".MathJax_MenuRadioCheck.RTL": {
        right: (isPC ? "1em" : ".7em"), left:"auto"
      },

      ".MathJax_MenuLabel": {
        padding: (isPC ? "2px 2em 4px 1.33em" : "1px 2em 3px 1.33em"),
        "font-style":"italic"
      },

      ".MathJax_MenuRule": {
        "border-top": (isPC ? "1px solid #CCCCCC" : "1px solid #DDDDDD"),
        margin: (isPC ? "4px 1px 0px" : "4px 3px")
      },

      ".MathJax_MenuDisabled": {
        color:"GrayText"
      },
      ".MathJax_MenuActive": {
        "background-color": (isPC ? "Highlight" : "#606872"),
        color: (isPC ? "HighlightText" : "white")
      },

      ".MathJax_MenuDisabled:focus, .MathJax_MenuLabel:focus": {
        "background-color": "#E8E8E8"
      },
      ".MathJax_ContextMenu:focus": {
        outline:"none"
      },
      ".MathJax_ContextMenu .MathJax_MenuItem:focus": {
        outline:"none"
      },

      "#MathJax_AboutClose": {
        top:".2em", right:".2em"
      },
      ".MathJax_Menu .MathJax_MenuClose": {
        top:"-10px", left:"-10px"
      },

      ".MathJax_MenuClose": {
        position:"absolute",
        cursor:"pointer",
        display:"inline-block",
        border:"2px solid #AAA",
        "border-radius":"18px",
        "-webkit-border-radius": "18px",             // Safari and Chrome
        "-moz-border-radius": "18px",                // Firefox
        "-khtml-border-radius": "18px",              // Konqueror
        "font-family":"'Courier New',Courier",
        "font-size":"24px",
        color:"#F0F0F0"
      },
      ".MathJax_MenuClose span": {
        display:"block", "background-color":"#AAA", border:"1.5px solid",
        "border-radius":"18px",
        "-webkit-border-radius": "18px",             // Safari and Chrome
        "-moz-border-radius": "18px",                // Firefox
        "-khtml-border-radius": "18px",              // Konqueror
        "line-height":0,
        padding:"8px 0 6px"     // may need to be browser-specific
      },
      ".MathJax_MenuClose:hover": {
        color:"white!important",
        border:"2px solid #CCC!important"
      },
      ".MathJax_MenuClose:hover span": {
        "background-color":"#CCC!important"
      },
      ".MathJax_MenuClose:hover:focus": {
        outline:"none"
      }
    }
  });

  var FALSE, HOVER, KEY;
  HUB.Register.StartupHook("MathEvents Ready",function () {
    FALSE = MathJax.Extension.MathEvents.Event.False;
    HOVER = MathJax.Extension.MathEvents.Hover;
    KEY = MathJax.Extension.MathEvents.Event.KEY;
  });


  /*************************************************************/
  /*
   *  Abstract class of all keyboard navigatable objects.
   */
  var NAV = MathJax.Object.Subclass({
    /*
     * Moving in the list of items.
     */
    Keydown: function(event, menu) {
      switch (event.keyCode) {
      case KEY.ESCAPE:
        this.Remove(event, menu);
        break;
      case KEY.RIGHT:
        this.Right(event, menu);
        break;
      case KEY.LEFT:
        this.Left(event, menu);
        break;
      case KEY.UP:
        this.Up(event, menu);
        break;
      case KEY.DOWN:
        this.Down(event, menu);
        break;
      case KEY.RETURN:
      case KEY.SPACE:
        this.Space(event, menu);
        break;
      default:
        return;
        break;
      }
      return FALSE(event);
    },
    Escape: function(event, menu) { },
    Right: function(event, menu) { },
    Left: function(event, menu) { },
    Up: function(event, menu) { },
    Down: function(event, menu) { },
    Space: function(event, menu) { }
  }, {});


  /*************************************************************/
  /*
   *  The main menu class
   */
  var MENU = MathJax.Menu = NAV.Subclass({
    version: VERSION,
    items: [],
    posted: false,
    title: null,
    margin: 5,

    Init: function (def) {this.items = [].slice.call(arguments,0)},
    With: function (def) {if (def) {HUB.Insert(this,def)}; return this},

    /*
     *  Display the menu
     */
    Post: function (event,parent,forceLTR) {
      if (!event) {event = window.event||{}}
      var div = document.getElementById("MathJax_MenuFrame");
      if (!div) {
        div = MENU.Background(this);
        delete ITEM.lastItem; delete ITEM.lastMenu;
        delete MENU.skipUp;
        SIGNAL.Post(["post",MENU.jax]);
        MENU.isRTL = (MathJax.Localization.fontDirection() === "rtl");
      }
      var menu = HTML.Element("div",{
        onmouseup: MENU.Mouseup, ondblclick: FALSE,
        ondragstart: FALSE, onselectstart: FALSE, oncontextmenu: FALSE,
        menuItem: this, className: "MathJax_Menu", onkeydown: MENU.Keydown,
        role: "menu"
      });
      if (event.type === "contextmenu" || event.type === "mouseover")
        menu.className += " MathJax_ContextMenu";
      if (!forceLTR) {MathJax.Localization.setCSS(menu)}

      for (var i = 0, m = this.items.length; i < m; i++) {this.items[i].Create(menu)}
      if (MENU.isMobile) {
        HTML.addElement(menu,"span",{
          className: "MathJax_MenuClose", menu: parent,
          ontouchstart: MENU.Close, ontouchend: FALSE, onmousedown: MENU.Close, onmouseup: FALSE
        },[["span",{},"\u00D7"]]);
      }

      div.appendChild(menu);
      this.posted = true;
      if (menu.offsetWidth) menu.style.width = (menu.offsetWidth+2) + "px";
      var x = event.pageX, y = event.pageY;
      if (!x && !y && "clientX" in event) {
        x = event.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
        y = event.clientY + document.body.scrollTop  + document.documentElement.scrollTop;
      }
      if (!parent) {
        var node = MENU.CurrentNode() || event.target;
        if ((event.type === "keydown" || (!x && !y)) && node) {
          var offsetX = window.pageXOffset || document.documentElement.scrollLeft;
          var offsetY = window.pageYOffset || document.documentElement.scrollTop;
          var rect = node.getBoundingClientRect();
          x = (rect.right + rect.left) / 2 + offsetX;
          y = (rect.bottom + rect.top) / 2 + offsetY;
        }
        if (x + menu.offsetWidth > document.body.offsetWidth - this.margin)
           {x = document.body.offsetWidth - menu.offsetWidth - this.margin}
        if (MENU.isMobile) {x = Math.max(5,x-Math.floor(menu.offsetWidth/2)); y -= 20}
        MENU.skipUp = event.isContextMenu;
      } else {
        var side = "left", mw = parent.offsetWidth;
        x = (MENU.isMobile ? 30 : mw - 2); y = 0;
        while (parent && parent !== div) {
          x += parent.offsetLeft; y += parent.offsetTop;
          parent = parent.parentNode;
        }
        if (!MENU.isMobile) {
          if ((MENU.isRTL && x - mw - menu.offsetWidth > this.margin) ||
              (!MENU.isRTL && x + menu.offsetWidth > document.body.offsetWidth - this.margin))
            {side = "right"; x = Math.max(this.margin,x - mw - menu.offsetWidth + 6)}
        }
        if (!isPC) {
          // in case these ever get implemented
          menu.style["borderRadiusTop"+side] = 0;       // Opera 10.5
          menu.style["WebkitBorderRadiusTop"+side] = 0; // Safari and Chrome
          menu.style["MozBorderRadiusTop"+side] = 0;    // Firefox
          menu.style["KhtmlBorderRadiusTop"+side] = 0;  // Konqueror
        }
      }

      menu.style.left = x+"px"; menu.style.top = y+"px";
      if (document.selection && document.selection.empty) {document.selection.empty()}

      // Focusing while keeping the scroll position.
      var oldX = window.pageXOffset || document.documentElement.scrollLeft;
      var oldY = window.pageYOffset || document.documentElement.scrollTop;
      MENU.Focus(menu);
      if (event.type === "keydown") {
        MENU.skipMouseoverFromKey = true;
        setTimeout(function() {delete MENU.skipMouseoverFromKey;}, CONFIG.delay);
      }
      window.scrollTo(oldX, oldY);
      return FALSE(event);
    },

    /*
     *  Remove the menu from the screen
     */
    Remove: function (event,menu) {
      SIGNAL.Post(["unpost",MENU.jax]);
      var div = document.getElementById("MathJax_MenuFrame");
      if (div) {
        div.parentNode.removeChild(div);
        if (this.msieFixedPositionBug) {detachEvent("onresize",MENU.Resize)}
      }
      if (MENU.jax.hover) {
        delete MENU.jax.hover.nofade;
        HOVER.UnHover(MENU.jax);
      }
      MENU.Unfocus(menu);
      if (event.type === "mousedown") MENU.CurrentNode().blur();
      return FALSE(event);
    },

    /*
     *  Find an item in a menu (or submenu) by name (Find) or ID (FindID).
     *  A list of names or IDs means descend into submenus.
     */
    Find: function (name) {return this.FindN(1,name,[].slice.call(arguments,1))},
    FindId: function (name) {return this.FindN(0,name,[].slice.call(arguments,1))},
    FindN: function (n,name,names) {
      for (var i = 0, m = this.items.length; i < m; i++) {
        if (this.items[i].name[n] === name) {
          if (names.length) {
            if (!this.items[i].submenu) {return null}
            return this.items[i].submenu.FindN(n,names[0],names.slice(1));
          }
          return this.items[i];
        }
      }
      return null;
    },

    /*
     *  Find the index of a menu item (so we can insert before or after it)
     */
    IndexOf: function (name) {return this.IndexOfN(1,name)},
    IndexOfId: function (name) {return this.IndexOfN(0,name)},
    IndexOfN: function (n,name) {
      for (var i = 0, m = this.items.length; i < m; i++)
        {if (this.items[i].name[n] === name) {return i}}
      return null;
    },

    Right: function(event, menu) {
      MENU.Right(event, menu);
    },
    Left: function(event, menu) {
      MENU.Left(event, menu);
    },
    Up: function(event, menu) {
      var node = menu.lastChild;
      node.menuItem.Activate(event, node);
    },
    Down: function(event, menu) {
      var node = menu.firstChild;
      node.menuItem.Activate(event, node);
    },
    Space: function(event, menu) {
      this.Remove(event, menu);
    }
  },{

    config: CONFIG,

    Remove:     function (event) {return MENU.Event(event,this,"Remove")},
    Mouseover:  function (event) {return MENU.Event(event,this,"Mouseover")},
    Mouseout:   function (event) {return MENU.Event(event,this,"Mouseout")},
    Mousedown:  function (event) {return MENU.Event(event,this,"Mousedown")},
    Mouseup:    function (event) {return MENU.Event(event,this,"Mouseup")},
    Keydown:    function (event) {return MENU.Event(event,this,"Keydown")},
    /*
     *  Events for mobile devices.
     */
    Touchstart: function (event) {return MENU.Event(event,this,"Touchstart")},
    Touchend:   function (event) {return MENU.Event(event,this,"Touchend")},
    Close:      function (event) {
      return MENU.Event(event,this.menu||this.parentNode,(this.menu?"Touchend":"Remove"));
    },
    Event: function (event,menu,type,force) {
      if (MENU.skipMouseover && type === "Mouseover" && !force) {return FALSE(event)}
      if (MENU.skipMouseoverFromKey && type === "Mouseover") {
        delete MENU.skipMouseoverFromKey;
        return FALSE(event);
      }
      if (MENU.skipUp) {
        if (type.match(/Mouseup|Touchend/)) {delete MENU.skipUp; return FALSE(event)}
        if (type === "Touchstart" ||
           (type === "Mousedown" && !MENU.skipMousedown)) {delete MENU.skipUp}
      }
      if (!event) {event = window.event}
      var item = menu.menuItem;
      if (item && item[type]) {return item[type](event,menu)}
      return null;
    },
    /*
     *  Style for the background DIV
     */
    BGSTYLE: {
      position:"absolute", left:0, top:0, "z-index":200,
      width:"100%", height:"100%", border:0, padding:0, margin:0
    },

    Background: function (menu) {
      var div = HTML.addElement(document.body,"div",
                    {style:this.BGSTYLE, id:"MathJax_MenuFrame"},
                    [["div",{style: this.BGSTYLE, menuItem: menu, onmousedown: this.Remove}]]);
      var bg = div.firstChild;
      if (MENU.msieBackgroundBug) {
        //  MSIE doesn't allow transparent background to be hit boxes, so
        //  fake it using opacity with solid background color
        bg.style.backgroundColor = "white"; bg.style.filter = "alpha(opacity=0)";
      }
      if (MENU.msieFixedPositionBug) {
        //  MSIE can't do fixed position, so use a full-sized background
        //  and an onresize handler to update it (stupid, but necessary)
        div.width = div.height = 0; this.Resize();
        attachEvent("onresize",this.Resize);
      } else {
        // otherwise, use a fixed position DIV to cover the viewport
        bg.style.position = "fixed";
      }
      return div;
    },
    Resize: function () {setTimeout(MENU.SetWH,0)},
    SetWH: function () {
      var bg = document.getElementById("MathJax_MenuFrame");
      if (bg) {
        bg = bg.firstChild;
        bg.style.width = bg.style.height = "1px"; // so scrollWidth/Height will be right below
        bg.style.width = document.body.scrollWidth + "px";
        bg.style.height = document.body.scrollHeight + "px";
      }
    },

    /*************************************************************/
    /*
     *  Keyboard navigation of menu.
     */
    posted: false,  // Is a menu open?
    active: null,   // The focused in HTML node in the menu.

    GetNode: function(jax) {
      var node = document.getElementById(jax.inputID + "-Frame");
      return node.isMathJax ? node : node.firstChild;
    },
    CurrentNode: function() {
      return MENU.GetNode(MENU.jax);
    },
    AllNodes: function() {
      var jaxs = MathJax.Hub.getAllJax();
      var nodes = [];
      for (var i = 0, jax; jax = jaxs[i]; i++) {
        nodes.push(MENU.GetNode(jax));
      }
      return nodes;
    },
    ActiveNode: function() {
      return MENU.active;
    },
    FocusNode: function(node) {
      MENU.active = node;
      node.focus();
    },
    //
    // Focus is a global affair, since we only ever want a single focused item.
    //
    Focus: function(menu) {
      !MENU.posted ? MENU.Activate(menu) : MENU.ActiveNode().tabIndex = -1;
      menu.tabIndex = 0;
      MENU.FocusNode(menu);
    },
    Activate: function(event, menu) {
      MENU.UnsetTabIndex();
      MENU.posted = true;
    },
    Unfocus: function() {
      MENU.ActiveNode().tabIndex = -1;
      MENU.SetTabIndex();
      MENU.FocusNode(MENU.CurrentNode());
      MENU.posted = false;
    },
    MoveHorizontal: function(event, menu, move) {
      if (!event.shiftKey) return;
      var jaxs = MENU.AllNodes();
      var len = jaxs.length;
      if (len === 0) return;
      var next = jaxs[MENU.Mod(move(MENU.IndexOf(jaxs, MENU.CurrentNode())), len)];
      if (next === MENU.CurrentNode()) return;
      MENU.menu.Remove(event, menu);
      MENU.jax = MathJax.Hub.getJaxFor(next);
      MENU.FocusNode(next);
      MENU.menu.Post(null);
    },
    Right: function(event, menu) {
      MENU.MoveHorizontal(event, menu, function(x) {return x + 1;});
    },
    Left: function(event, menu) {
      MENU.MoveHorizontal(event, menu, function(x) {return x - 1;});
    },
    UnsetTabIndex: function () {
      var jaxs = MENU.AllNodes();
      for (var j = 0, jax; jax = jaxs[j]; j++) {
        if (jax.tabIndex > 0) {
          jax.oldTabIndex = jax.tabIndex;
        }
        jax.tabIndex = -1;
      }
    },
    SetTabIndex: function () {
      var jaxs = MENU.AllNodes();
      for (var j = 0, jax; jax = jaxs[j]; j++) {
        if (jax.oldTabIndex !== undefined) {
          jax.tabIndex = jax.oldTabIndex
          delete jax.oldTabIndex;
        } else {
          jax.tabIndex = HUB.getTabOrder(jax);
        }
      }
    },

    //TODO: Move to utility class.
    // Computes a mod n.
    Mod: function(a, n) {
      return ((a % n) + n) % n;
    },
    IndexOf: (Array.prototype.indexOf ?
              function (A, item, start) {return A.indexOf(item, start);} :
              function (A, item, start) {
                for (var i = (start || 0), j = A.length; i < j; i++) {
                  if (item === A[i]) return i;
                }
                return -1;
              }),

    saveCookie: function () {HTML.Cookie.Set("menu",this.cookie)},
    getCookie: function () {this.cookie = HTML.Cookie.Get("menu")}

  });

  MathJax.Menu.NAV = NAV;

  /*************************************************************/
  /*
   *  Abstract class of menu items.
   */
  var ITEM = MENU.ITEM = NAV.Subclass({

    name: "", // The menu item's label as [id,label] pair.
    node: null,  // The HTML node of the item.
    menu: null,  // The parent menu containing that item. HTML node.

    Attributes: function(def) {
      return HUB.Insert(
        {onmouseup: MENU.Mouseup,
         ondragstart: FALSE, onselectstart: FALSE, onselectend: FALSE,
         ontouchstart: MENU.Touchstart, ontouchend: MENU.Touchend,
         className: "MathJax_MenuItem", role: this.role,
         menuItem: this},
        def);
    },

    Create: function (menu) {
      if (!this.hidden) {
        var def = this.Attributes();
        var label = this.Label(def,menu);
        HTML.addElement(menu, "div", def, label);
      }
    },
    Name: function () {return _(this.name[0],this.name[1])},

    Mouseover: function (event,menu) {
      if (menu.parentNode === MENU.ActiveNode().parentNode) {
       this.Deactivate(MENU.ActiveNode());
      }
      this.Activate(event, menu);
    },
    Mouseout: function (event,menu) {
      this.Deactivate(menu);
    },
    Mouseup: function (event,menu) {return this.Remove(event,menu)},


    DeactivateSubmenus: function(menu) {
      var menus = document.getElementById("MathJax_MenuFrame").childNodes,
          items = ITEM.GetMenuNode(menu).childNodes;
      for (var i = 0, m = items.length; i < m; i++) {
        var item = items[i].menuItem;
        // Deactivates submenu items.
        if (item && item.submenu && item.submenu.posted &&
            item !== menu.menuItem) {
          item.Deactivate(items[i]);
        }
      }
      this.RemoveSubmenus(menu, menus);
    },
    RemoveSubmenus: function(menu, menus) {
      menus = menus || document.getElementById("MathJax_MenuFrame").childNodes;
      var m = menus.length-1;
      while (m >= 0 && ITEM.GetMenuNode(menu).menuItem !== menus[m].menuItem) {
        menus[m].menuItem.posted = false;
        menus[m].parentNode.removeChild(menus[m]);
        m--;
      }
    },

    Touchstart: function (event,menu) {return this.TouchEvent(event,menu,"Mousedown")},
    Touchend: function (event,menu)   {return this.TouchEvent(event,menu,"Mouseup")},
    TouchEvent: function (event,menu,type) {
      if (this !== ITEM.lastItem) {
        if (ITEM.lastMenu) {MENU.Event(event,ITEM.lastMenu,"Mouseout")}
        MENU.Event(event,menu,"Mouseover",true);
        ITEM.lastItem = this; ITEM.lastMenu = menu;
      }
      if (this.nativeTouch) {return null}
      MENU.Event(event,menu,type);
      return false;
    },

    Remove: function (event,menu) {
      menu = menu.parentNode.menuItem;
      return menu.Remove(event,menu);
    },

    With: function (def) {if (def) {HUB.Insert(this,def)}; return this},

    isRTL: function () {return MENU.isRTL},
    rtlClass: function () {return (this.isRTL() ? " RTL" : "")}
  }, {
    GetMenuNode: function(item) {
      return item.parentNode;
    }
  });

  /*************************************************************/
  /*
   *  Abstract class of menu items that are focusable and perform some action
   */
  MENU.ENTRY = MENU.ITEM.Subclass({
    role: "menuitem",  // Aria role.

    Attributes: function(def) {
      def = HUB.Insert(
        {onmouseover: MENU.Mouseover, onmouseout: MENU.Mouseout,
         onmousedown: MENU.Mousedown, onkeydown: MENU.Keydown,
         "aria-disabled": !!this.disabled},
        def);
      def = this.SUPER(arguments).Attributes.call(this, def);
      if (this.disabled) {
        def.className += " MathJax_MenuDisabled";
      }
      return def;
    },
    MoveVertical: function(event, item, move) {
      var menuNode = ITEM.GetMenuNode(item);
      var items = [];
      for (var i = 0, allItems = menuNode.menuItem.items, it;
           it = allItems[i]; i++) {
        if (!it.hidden) {
          items.push(it);
        }
      }
      var index = MENU.IndexOf(items, this);
      if (index === -1) return;
      var len = items.length;
      var children = menuNode.childNodes;
      do {
        index = MENU.Mod(move(index), len);
      } while (items[index].hidden || !children[index].role ||
               children[index].role === "separator");
      this.Deactivate(item);
      items[index].Activate(event, children[index]);
    },
    Up: function(event, item) {
      this.MoveVertical(event, item, function(x) { return x - 1; });
    },
    Down: function(event, item) {
      this.MoveVertical(event, item, function(x) { return x + 1; });
    },
    Right: function(event, item) {
      this.MoveHorizontal(event, item, MENU.Right, !this.isRTL());
    },
    Left: function(event, item) {
      this.MoveHorizontal(event, item, MENU.Left, this.isRTL());
    },
    MoveHorizontal: function(event, item, move, rtl) {
      var menuNode = ITEM.GetMenuNode(item);
      if (menuNode.menuItem === MENU.menu && event.shiftKey) {
        move(event, item);
      }
      if (rtl) return;
      if (menuNode.menuItem !== MENU.menu) {
        this.Deactivate(item);
      }
      var parentNodes = menuNode.previousSibling.childNodes;
      var length = parentNodes.length;
      while (length--) {
        var parent = parentNodes[length];
        if (parent.menuItem.submenu &&
            parent.menuItem.submenu === menuNode.menuItem) {
          MENU.Focus(parent);
          break;
        }
      }
      this.RemoveSubmenus(item);
    },
    Space: function (event, menu) {
      this.Mouseup(event, menu);
    },

    Activate: function (event, menu) {
      this.Deactivate(menu);
      if (!this.disabled) {
        menu.className += " MathJax_MenuActive";
      }
      this.DeactivateSubmenus(menu);
      MENU.Focus(menu);
    },
    Deactivate: function (menu) {
      menu.className = menu.className.replace(/ MathJax_MenuActive/,"");
    }

  });

  /*************************************************************/
  /*
   *  A menu item that performs a command when selected
   */
  MENU.ITEM.COMMAND = MENU.ENTRY.Subclass({
    action: function () {},

    Init: function (name,action,def) {
      if (!(name instanceof Array)) {name = [name,name]}  // make [id,label] pair
      this.name = name; this.action = action;
      this.With(def);
    },

    Label: function (def,menu) {return [this.Name()]},
    Mouseup: function (event,menu) {
      if (!this.disabled) {
        this.Remove(event,menu);
        SIGNAL.Post(["command",this]);
        this.action.call(this,event);
      }
      return FALSE(event);
    }
  });

  /*************************************************************/
  /*
   *  A menu item that posts a submenu
   */
  MENU.ITEM.SUBMENU = MENU.ENTRY.Subclass({
    submenu: null,        // the submenu
    marker: "\u25BA",  // the submenu arrow
    markerRTL: "\u25C4", // the submenu arrow for RTL

    Attributes: function(def) {
      def = HUB.Insert({"aria-haspopup": "true"}, def);
      def = this.SUPER(arguments).Attributes.call(this, def);
      return def;
    },
    Init: function (name,def) {
      if (!(name instanceof Array)) {name = [name,name]}  // make [id,label] pair
      this.name = name; var i = 1;
      if (!(def instanceof MENU.ITEM)) {this.With(def), i++}
      this.submenu = MENU.apply(MENU,[].slice.call(arguments,i));
    },
    Label: function (def,menu) {
      this.submenu.posted = false;
      return [this.Name()+" ",["span",{
        className:"MathJax_MenuArrow" + this.rtlClass()
      },[this.isRTL() ? this.markerRTL : this.marker]]];
    },
    Timer: function (event,menu) {
      this.ClearTimer();
      event = {type: event.type,
               clientX: event.clientX, clientY: event.clientY}; // MSIE can't pass the event below
      this.timer = setTimeout(CALLBACK(["Mouseup",this,event,menu]),CONFIG.delay);
    },
    ClearTimer: function() {
      if (this.timer) {
        clearTimeout(this.timer);
      }
    },
    Touchend: function (event,menu) {
      var forceout = this.submenu.posted;
      var result = this.SUPER(arguments).Touchend.apply(this,arguments);
      if (forceout) {this.Deactivate(menu); delete ITEM.lastItem; delete ITEM.lastMenu}
      return result;
    },
    Mouseout: function(event, menu) {
      if (!this.submenu.posted) {
        this.Deactivate(menu);
      }
      this.ClearTimer();
    },
    Mouseover: function(event, menu) {
      this.Activate(event, menu);
    },
    Mouseup: function (event,menu) {
      if (!this.disabled) {
        if (!this.submenu.posted) {
          this.ClearTimer();
          this.submenu.Post(event, menu, this.ltr);
          MENU.Focus(menu);
        } else {
          this.DeactivateSubmenus(menu);
        }
      }
      return FALSE(event);
    },
    Activate: function (event, menu) {
      if (!this.disabled) {
        this.Deactivate(menu);
        menu.className += " MathJax_MenuActive";
      }
      if (!this.submenu.posted) {
        this.DeactivateSubmenus(menu);
        if (!MENU.isMobile) {
          this.Timer(event,menu);
        }
      }
      MENU.Focus(menu);
    },
    MoveVertical: function(event, item, move) {
      this.ClearTimer();
      this.SUPER(arguments).MoveVertical.apply(this, arguments);
    },
    MoveHorizontal: function(event, menu, move, rtl) {
      if (!rtl) {
        this.SUPER(arguments).MoveHorizontal.apply(this, arguments);
        return;
      }
      if (this.disabled) return;
      if (!this.submenu.posted) {
        this.Activate(event, menu);
        return;
      }
      var submenuNodes = ITEM.GetMenuNode(menu).nextSibling.childNodes;
      if (submenuNodes.length > 0) {
        this.submenu.items[0].Activate(event, submenuNodes[0]);
      }
    }
  });

  /*************************************************************/
  /*
   *  A menu item that is one of several radio buttons
   */
  MENU.ITEM.RADIO = MENU.ENTRY.Subclass({
    variable: null,     // the variable name
    marker: (isPC ? "\u25CF" : "\u2713"),   // the checkmark
    role: "menuitemradio",

    Attributes: function(def) {
      var checked = CONFIG.settings[this.variable] === this.value ? "true" : "false";
      def = HUB.Insert({"aria-checked": checked}, def);
      def = this.SUPER(arguments).Attributes.call(this, def);
      return def;
    },
    Init: function (name,variable,def) {
      if (!(name instanceof Array)) {name = [name,name]}  // make [id,label] pair
      this.name = name; this.variable = variable; this.With(def);
      if (this.value == null) {this.value = this.name[0]}
    },
    Label: function (def,menu) {
      var span = {className:"MathJax_MenuRadioCheck" + this.rtlClass()};
      if (CONFIG.settings[this.variable] !== this.value) {
        span = {style:{display:"none"}};
      }
      return [["span",span,[this.marker]]," "+this.Name()];
    },
    Mouseup: function (event,menu) {
      if (!this.disabled) {
        var child = menu.parentNode.childNodes;
        for (var i = 0, m = child.length; i < m; i++) {
          var item = child[i].menuItem;
          if (item && item.variable === this.variable) {
            child[i].firstChild.style.display = "none";
          }
        }
        menu.firstChild.display = "";
        CONFIG.settings[this.variable] = this.value;
        MENU.cookie[this.variable] = CONFIG.settings[this.variable]; MENU.saveCookie();
        SIGNAL.Post(["radio button",this]);
      }
      this.Remove(event,menu);
      if (this.action && !this.disabled) {this.action.call(MENU,this)}
      return FALSE(event);
    }
  });

  /*************************************************************/
  /*
   *  A menu item that is checkable
   */
  MENU.ITEM.CHECKBOX = MENU.ENTRY.Subclass({
    variable: null,     // the variable name
    marker: "\u2713",   // the checkmark
    role: "menuitemcheckbox",

    Attributes: function(def) {
      var checked = CONFIG.settings[this.variable] ? "true" : "false";
      def = HUB.Insert({"aria-checked": checked}, def);
      def = this.SUPER(arguments).Attributes.call(this, def);
      return def;
    },
    Init: function (name,variable,def) {
      if (!(name instanceof Array)) {name = [name,name]}  // make [id,label] pair
      this.name = name; this.variable = variable; this.With(def);
    },
    Label: function (def,menu) {
      var span = {className:"MathJax_MenuCheck" + this.rtlClass()};
      if (!CONFIG.settings[this.variable]) {span = {style:{display:"none"}}}
      return [["span",span,[this.marker]]," "+this.Name()];
    },
    Mouseup: function (event,menu) {
      if (!this.disabled) {
        menu.firstChild.display = (CONFIG.settings[this.variable] ? "none" : "");
        CONFIG.settings[this.variable] = !CONFIG.settings[this.variable];
        MENU.cookie[this.variable] = CONFIG.settings[this.variable]; MENU.saveCookie();
        SIGNAL.Post(["checkbox",this]);
      }
      this.Remove(event,menu);
      if (this.action && !this.disabled) {this.action.call(MENU,this)}
      return FALSE(event);
    }
  });

  /*************************************************************/
  /*
   *  A menu item that is a label
   */
  MENU.ITEM.LABEL = MENU.ENTRY.Subclass({
    role: "menuitem",  // Aria role.

    Init: function (name,def) {
      if (!(name instanceof Array)) {name = [name,name]}  // make [id,label] pair
      this.name = name; this.With(def);
    },
    Label: function (def,menu) {
      def.className += " MathJax_MenuLabel";
      return [this.Name()];
    },
    Activate: function(event, menu) {
      this.Deactivate(menu);
      MENU.Focus(menu);
    },
    Mouseup: function (event,menu) { }
  });

  /*************************************************************/
  /*
   *  A rule in a menu
   */
  MENU.ITEM.RULE = MENU.ITEM.Subclass({
    role: "separator",

    Attributes: function(def) {
      def = HUB.Insert({"aria-orientation": "vertical"}, def);
      def = this.SUPER(arguments).Attributes.call(this, def);
      return def;
    },
    Label: function (def,menu) {
      def.className += " MathJax_MenuRule";
      return null;
    }
  });

  /*************************************************************/
  /*************************************************************/

  /*
   *  Handle the ABOUT box
   */
  MENU.About = function (event) {
    var font = MENU.About.GetFont();
    var format = MENU.About.GetFormat();
    var jax = ["MathJax.js v"+MathJax.fileversion,["br"]];
    jax.push(["div",{style:{"border-top":"groove 2px",margin:".25em 0"}}]);
    MENU.About.GetJax(jax,MathJax.InputJax,["InputJax","%1 Input Jax v%2"]);
    MENU.About.GetJax(jax,MathJax.OutputJax,["OutputJax","%1 Output Jax v%2"]);
    MENU.About.GetJax(jax,MathJax.ElementJax,["ElementJax","%1 Element Jax v%2"]);
    jax.push(["div",{style:{"border-top":"groove 2px",margin:".25em 0"}}]);
    MENU.About.GetJax(jax,MathJax.Extension,["Extension","%1 Extension v%2"],true);
    jax.push(["div",{style:{"border-top":"groove 2px",margin:".25em 0"}}],["center",{},[
      HUB.Browser + " v"+HUB.Browser.version + (format ?
        " \u2014 " + _(format.replace(/ /g,""),format) : "")
    ]]);
    MENU.About.div = MENU.Background(MENU.About);
    var about = HTML.addElement(MENU.About.div,"div",{
      id: "MathJax_About", tabIndex: 0, onkeydown: MENU.About.Keydown
    },[
      ["b",{style:{fontSize:"120%"}},["MathJax"]]," v"+MathJax.version,["br"],
      _(font.replace(/ /g,""),"using "+font),["br"],["br"],
      ["span",{style:{
        display:"inline-block", "text-align":"left", "font-size":"80%",
        "max-height":"20em", overflow:"auto",
        "background-color":"#E4E4E4", padding:".4em .6em", border:"1px inset"
      }, tabIndex: 0},jax],["br"],["br"],
      ["a",{href:"http://www.mathjax.org/"},["www.mathjax.org"]],
      ["span",{className:"MathJax_MenuClose",id:"MathJax_AboutClose",
               onclick:MENU.About.Remove,
               onkeydown: MENU.About.Keydown, tabIndex: 0, role: "button",
               "aria-label": _("CloseAboutDialog","Close about MathJax dialog")},
        [["span",{},"\u00D7"]]]
    ]);
    if (event.type === "mouseup") about.className += " MathJax_MousePost";
    about.focus();
    MathJax.Localization.setCSS(about);
    var doc = (document.documentElement||{});
    var H = window.innerHeight || doc.clientHeight || doc.scrollHeight || 0;
    if (MENU.prototype.msieAboutBug) {
      about.style.width = "20em"; about.style.position = "absolute";
      about.style.left = Math.floor((document.documentElement.scrollWidth - about.offsetWidth)/2)+"px";
      about.style.top = (Math.floor((H-about.offsetHeight)/3)+document.body.scrollTop)+"px";
    } else {
      about.style.marginLeft = Math.floor(-about.offsetWidth/2)+"px";
      about.style.top = Math.floor((H-about.offsetHeight)/3)+"px";
    }
  };
  MENU.About.Remove = function (event) {
    if (MENU.About.div) {document.body.removeChild(MENU.About.div); delete MENU.About.div}
  };
  MENU.About.Keydown = function(event) {
    if (event.keyCode === KEY.ESCAPE ||
        (this.id === "MathJax_AboutClose" &&
         (event.keyCode === KEY.SPACE || event.keyCode === KEY.RETURN))) {
      MENU.About.Remove(event);
      MENU.CurrentNode().focus();
      FALSE(event);
    }
  },
  MENU.About.GetJax = function (jax,JAX,type,noTypeCheck) {
    var info = [];
    for (var id in JAX) {if (JAX.hasOwnProperty(id) && JAX[id]) {
      if ((noTypeCheck && JAX[id].version) || (JAX[id].isa && JAX[id].isa(JAX)))
        {info.push(_(type[0],type[1],(JAX[id].id||id),JAX[id].version))}
    }}
    info.sort();
    for (var i = 0, m = info.length; i < m; i++) {jax.push(info[i],["br"])}
    return jax;
  };
  MENU.About.GetFont = function () {
    var jax = MathJax.Hub.outputJax["jax/mml"][0] || {};
    var font = {
      SVG: "web SVG",
      CommonHTML: "web TeX",
      "HTML-CSS": (jax.imgFonts ? "image" : (jax.webFonts ? "web" : "local")+" "+jax.fontInUse)
    }[jax.id] || "generic";
    return font + " fonts";
  };
  MENU.About.GetFormat = function () {
    var jax = MathJax.Hub.outputJax["jax/mml"][0] || {};
    if (jax.id !== "HTML-CSS"|| !jax.webFonts || jax.imgFonts) return;
    return jax.allowWebFonts.replace(/otf/,"woff or otf") + " fonts";
  };


  /*
   *  Handle the MathJax HELP menu
   */
  MENU.Help = function (event) {
    AJAX.Require("[MathJax]/extensions/HelpDialog.js",
                 function () {MathJax.Extension.Help.Dialog({type:event.type})});
  };

  /*
   *  Handle showing of element's source
   */
  MENU.ShowSource = function (event) {
    if (!event) {event = window.event}
    var EVENT = {screenX:event.screenX, screenY:event.screenY};
    if (!MENU.jax) return;
    if (this.format === "MathML") {
      var MML = MathJax.ElementJax.mml;
      if (MML && typeof(MML.mbase.prototype.toMathML) !== "undefined") {
        // toMathML() can call MathJax.Hub.RestartAfter, so trap errors and check
        try {MENU.ShowSource.Text(MENU.jax.root.toMathML("",MENU.jax),event)} catch (err) {
          if (!err.restart) {throw err}
          CALLBACK.After([this,MENU.ShowSource,EVENT],err.restart);
        }
      } else if (!AJAX.loadingToMathML) {
        AJAX.loadingToMathML = true;
        MENU.ShowSource.Window(event); // WeBKit needs to open window on click event
        CALLBACK.Queue(
          AJAX.Require("[MathJax]/extensions/toMathML.js"),
          function () {
            delete AJAX.loadingToMathML;
            if (!MML.mbase.prototype.toMathML) {MML.mbase.prototype.toMathML = function () {}}
          },
          [this,MENU.ShowSource,EVENT]  // call this function again
        );
        return;
      }
    } else if (this.format === "Error") {
      MENU.ShowSource.Text(MENU.jax.errorText,event);
    } else if (CONFIG.semanticsAnnotations[this.format]) {
      var annotation = MENU.jax.root.getAnnotation(this.format);
      if (annotation.data[0]) MENU.ShowSource.Text(annotation.data[0].toString());
    } else {
      if (MENU.jax.originalText == null) {
        alert(_("NoOriginalForm","No original form available"));
        return;
      }
      MENU.ShowSource.Text(MENU.jax.originalText,event);
    }
  };
  MENU.ShowSource.Window = function (event) {
    if (!MENU.ShowSource.w) {
      var def = [], DEF = CONFIG.windowSettings;
      for (var id in DEF) {if (DEF.hasOwnProperty(id)) {def.push(id+"="+DEF[id])}}
      MENU.ShowSource.w = window.open("","_blank",def.join(","));
    }
    return MENU.ShowSource.w;
  };
  MENU.ShowSource.Text = function (text,event) {
    var w = MENU.ShowSource.Window(event); delete MENU.ShowSource.w;
    text = text.replace(/^\s*/,"").replace(/\s*$/,"");
    text = text.replace(/&/g,"&amp;").replace(/</g,"&lt;").replace(/>/g,"&gt;");
    var title = _("EqSource","MathJax Equation Source");
    if (MENU.isMobile) {
      w.document.open();
      w.document.write("<html><head><meta name='viewport' content='width=device-width, initial-scale=1.0' /><title>"+title+"</title></head><body style='font-size:85%'>");
      w.document.write("<pre>"+text+"</pre>");
      w.document.write("<hr><input type='button' value='"+_("Close","Close")+"' onclick='window.close()' />");
      w.document.write("</body></html>");
      w.document.close();
    } else {
      w.document.open();
      w.document.write("<html><head><title>"+title+"</title></head><body style='font-size:85%'>");
      w.document.write("<table><tr><td><pre>"+text+"</pre></td></tr></table>");
      w.document.write("</body></html>");
      w.document.close();
      var table = w.document.body.firstChild;
      setTimeout(function () {
        var H = (w.outerHeight-w.innerHeight)||30, W = (w.outerWidth-w.innerWidth)||30, x, y;
        W = Math.max(140,Math.min(Math.floor(.5*screen.width),table.offsetWidth+W+25));
        H = Math.max(40,Math.min(Math.floor(.5*screen.height),table.offsetHeight+H+25));
        if (MENU.prototype.msieHeightBug) {H += 35}; // for title bar in XP
        w.resizeTo(W,H);
        var X; try {X = event.screenX} catch (e) {}; // IE8 throws an error accessing screenX
        if (event && X != null) {
          x = Math.max(0,Math.min(event.screenX-Math.floor(W/2), screen.width-W-20));
          y = Math.max(0,Math.min(event.screenY-Math.floor(H/2), screen.height-H-20));
          w.moveTo(x,y);
        }
      },50);
    }
  };

  /*
   *  Handle rescaling all the math
   */
  MENU.Scale = function () {
    var JAX = ["CommonHTML","HTML-CSS","SVG","NativeMML","PreviewHTML"], m = JAX.length,
        SCALE = 100, i, jax;
    for (i = 0; i < m; i++) {
      jax = OUTPUT[JAX[i]];
      if (jax) {SCALE = jax.config.scale; break}
    }
    var scale = prompt(_("ScaleMath","Scale all mathematics (compared to surrounding text) by"),SCALE+"%");
    if (scale) {
      if (scale.match(/^\s*\d+(\.\d*)?\s*%?\s*$/)) {
        scale = parseFloat(scale);
        if (scale) {
          if (scale !== SCALE) {
            for (i = 0; i < m; i++) {
              jax = OUTPUT[JAX[i]];
              if (jax) jax.config.scale = scale;
            }
            MENU.cookie.scale = HUB.config.scale = scale;
            MENU.saveCookie(); 
            HUB.Queue(["Rerender",HUB]);
          }
        } else {alert(_("NonZeroScale","The scale should not be zero"))}
      } else {alert(_("PercentScale",
                      "The scale should be a percentage (e.g., 120%%)"))}
    }
  };

  /*
   *  Handle loading the zoom code
   */
  MENU.Zoom = function () {
    if (!MathJax.Extension.MathZoom) {AJAX.Require("[MathJax]/extensions/MathZoom.js")}
  };

  /*
   *  Handle changing the renderer
   */
  MENU.Renderer = function () {
    var jax = HUB.outputJax["jax/mml"];
    if (jax[0] !== CONFIG.settings.renderer) {
      var BROWSER = HUB.Browser, message, MESSAGE = MENU.Renderer.Messages, warned;
      //
      //  Check that the new renderer is appropriate for the browser
      //
      switch (CONFIG.settings.renderer) {
        case "NativeMML":
          if (!CONFIG.settings.warnedMML) {
            if (BROWSER.isChrome && BROWSER.version.substr(0,3) !== "24.") {message = MESSAGE.MML.WebKit}
            else if (BROWSER.isSafari && !BROWSER.versionAtLeast("5.0")) {message = MESSAGE.MML.WebKit}
            else if (BROWSER.isMSIE) {if (!BROWSER.hasMathPlayer) {message = MESSAGE.MML.MSIE}}
            else if (BROWSER.isEdge) {message = MESSAGE.MML.WebKit}
            else {message = MESSAGE.MML[BROWSER]}
            warned = "warnedMML";
          }
          break;

        case "SVG":
          if (!CONFIG.settings.warnedSVG) {
            if (BROWSER.isMSIE && !isIE9) {message = MESSAGE.SVG.MSIE}
          }
          break;
      }
      if (message) {
        message = _(message[0],message[1]);
        message += "\n\n";
        message += _("SwitchAnyway",
                     "Switch the renderer anyway?\n\n" +
                     "(Press OK to switch, CANCEL to continue with the current renderer)");
        MENU.cookie.renderer = jax[0].id; MENU.saveCookie();
        if (!confirm(message)) {
          MENU.cookie.renderer = CONFIG.settings.renderer = HTML.Cookie.Get("menu").renderer;
          MENU.saveCookie();
          return;
        }
        if (warned) {MENU.cookie.warned  = CONFIG.settings.warned = true}
        MENU.cookie.renderer = CONFIG.settings.renderer; MENU.saveCookie();
      }
      HUB.Queue(
        ["setRenderer",HUB,CONFIG.settings.renderer,"jax/mml"],
        ["Rerender",HUB]
      );
    }
  };
  MENU.Renderer.Messages = {
    MML: {
      WebKit:  ["WebkitNativeMMLWarning",
                 "Your browser doesn't seem to support MathML natively, " +
                 "so switching to MathML output may cause the mathematics " +
                 "on the page to become unreadable."],

      MSIE:    ["MSIENativeMMLWarning",
                 "Internet Explorer requires the MathPlayer plugin " +
                 "in order to process MathML output."],

      Opera:   ["OperaNativeMMLWarning",
                 "Opera's support for MathML is limited, so switching to " +
                 "MathML output may cause some expressions to render poorly."],

      Safari:  ["SafariNativeMMLWarning",
                 "Your browser's native MathML does not implement all the features " +
                 "used by MathJax, so some expressions may not render properly."],

      Firefox: ["FirefoxNativeMMLWarning",
                 "Your browser's native MathML does not implement all the features " +
                 "used by MathJax, so some expressions may not render properly."]
    },

    SVG: {
      MSIE:    ["MSIESVGWarning",
                 "SVG is not implemented in Internet Explorer prior to " +
                 "IE9 or when it is emulating IE8 or below. " +
                 "Switching to SVG output will cause the mathematics to " +
                 "not display properly."]
    }
  };
  
  /*
   *  Toggle assistive MML settings
   */
  MENU.AssistiveMML = function (item,restart) {
    var AMML = MathJax.Extension.AssistiveMML;
    if (!AMML) {
      //  Try to load the extension, but only try once.
      if (!restart)
        AJAX.Require("[MathJax]/extensions/AssistiveMML.js",["AssistiveMML",MENU,item,true]);
      return;
    }
    MathJax.Hub.Queue([(CONFIG.settings.assistiveMML ? "Add" : "Remove")+"AssistiveMathML",AMML]);
  };

  /*
   *  Handle setting the HTMLCSS fonts
   */
  MENU.Font = function () {
    var HTMLCSS = OUTPUT["HTML-CSS"]; if (!HTMLCSS) return;
    document.location.reload();
  };

  /*
   *  Handle selection of locale and rerender the page
   */
  MENU.Locale = function () {
    MathJax.Localization.setLocale(CONFIG.settings.locale);
    MathJax.Hub.Queue(["Reprocess",MathJax.Hub]); // FIXME: Just reprocess error messages?
  };
  MENU.LoadLocale = function () {
    var url = prompt(_("LoadURL","Load translation data from this URL:"));
    if (url) {
      if (!url.match(/\.js$/)) {
        alert(_("BadURL",
          "The URL should be for a javascript file that defines MathJax translation data.  " +
          "Javascript file names should end with '.js'"
        ));
      }
      AJAX.Require(url,function (status) {
        if (status != AJAX.STATUS.OK) {alert(_("BadData","Failed to load translation data from %1",url))}
      });
    }
  };

  /*
   *  Handle setting MathPlayer events
   */
  MENU.MPEvents = function (item) {
    var discoverable = CONFIG.settings.discoverable,
        MESSAGE = MENU.MPEvents.Messages;
    if (!isIE9) {
      if (CONFIG.settings.mpMouse && !confirm(_.apply(_,MESSAGE.IE8warning))) {
        delete MENU.cookie.mpContext; delete CONFIG.settings.mpContext;
        delete MENU.cookie.mpMouse; delete CONFIG.settings.mpMouse;
        MENU.saveCookie();
        return;
      }
      CONFIG.settings.mpContext = CONFIG.settings.mpMouse;
      MENU.cookie.mpContext = MENU.cookie.mpMouse = CONFIG.settings.mpMouse;
      MENU.saveCookie();
      MathJax.Hub.Queue(["Rerender",MathJax.Hub])
    } else if (!discoverable && item.name[1] === "Menu Events" && CONFIG.settings.mpContext) {
      alert(_.apply(_,MESSAGE.IE9warning));
    }
  };

  MENU.MPEvents.Messages = {
    IE8warning: ["IE8warning",
      "This will disable the MathJax menu and zoom features, " +
      "but you can Alt-Click on an expression to obtain the MathJax " +
      "menu instead.\n\nReally change the MathPlayer settings?"],

    IE9warning: ["IE9warning",
      "The MathJax contextual menu will be disabled, but you can " +
      "Alt-Click on an expression to obtain the MathJax menu instead."]
  };

  /*************************************************************/
  /*************************************************************/

  HUB.Browser.Select({
    MSIE: function (browser) {
      var quirks = (document.compatMode === "BackCompat");
      var isIE8 = browser.versionAtLeast("8.0") && document.documentMode > 7;
      MENU.Augment({
        margin: 20,
        msieBackgroundBug: ((document.documentMode||0) < 9),
        msieFixedPositionBug: (quirks || !isIE8),
        msieAboutBug: quirks,
        msieHeightBug: ((document.documentMode||0) < 9)
           // height of window doesn't include title bar in XP
      });
      if (isIE9) {
        delete CONFIG.styles["#MathJax_About"].filter;
        delete CONFIG.styles[".MathJax_Menu"].filter;
      }
    },
    Firefox: function (browser) {
      MENU.skipMouseover = browser.isMobile && browser.versionAtLeast("6.0");
      MENU.skipMousedown = browser.isMobile;
    }
  });
  MENU.isMobile      = HUB.Browser.isMobile;
  MENU.noContextMenu = HUB.Browser.noContextMenu;

  /*************************************************************/

  //
  //  Creates the locale menu from the list of locales in MathJax.Localization.strings
  //
  MENU.CreateLocaleMenu = function () {
    if (!MENU.menu) return;
    var menu = MENU.menu.Find("Language").submenu, items = menu.items;
    //
    //  Get the names of the languages and sort them
    //
    var locales = [], LOCALE = MathJax.Localization.strings;
    for (var id in LOCALE) {if (LOCALE.hasOwnProperty(id)) {locales.push(id)}}
    locales = locales.sort(); menu.items = [];
    //
    //  Add a menu item for each
    //
    for (var i = 0, m = locales.length; i < m; i++) {
      var title = LOCALE[locales[i]].menuTitle;
      if (title) {title += " ("+locales[i]+")"} else {title = locales[i]}
      menu.items.push(ITEM.RADIO([locales[i],title],"locale",{action:MENU.Locale}));
    }
    //
    //  Add the rule and "Load from URL" items
    //
    menu.items.push(items[items.length-2],items[items.length-1]);
  };

  //
  // Create the annotation menu from MathJax.Hub.config.semanticsAnnotations
  //
  MENU.CreateAnnotationMenu = function () {
    if (!MENU.menu) return;
    var menu = MENU.menu.Find("Show Math As","Annotation").submenu;
    var annotations = CONFIG.semanticsAnnotations;
    for (var a in annotations) {
      if (annotations.hasOwnProperty(a)) {
        menu.items.push(ITEM.COMMAND([a,a], MENU.ShowSource, {hidden: true, nativeTouch: true, format: a}));
      }
    }
  };

  /*************************************************************/

  HUB.Register.StartupHook("End Config",function () {

    /*
     *  Get the menu settings from the HUB (which includes the
     *  data from the cookie already), and add the format, if
     *  it wasn't set in the cookie.
     */
    CONFIG.settings = HUB.config.menuSettings;
    if (typeof(CONFIG.settings.showRenderer) !== "undefined") {CONFIG.showRenderer = CONFIG.settings.showRenderer}
    if (typeof(CONFIG.settings.showFontMenu) !== "undefined") {CONFIG.showFontMenu = CONFIG.settings.showFontMenu}
    if (typeof(CONFIG.settings.showContext)  !== "undefined") {CONFIG.showContext  = CONFIG.settings.showContext}
    MENU.getCookie();

    /*
     *  The main menu
     */
    // Localization: items used as key, should be refactored.
    MENU.menu = MENU(
      ITEM.SUBMENU(["Show","Show Math As"],
        ITEM.COMMAND(["MathMLcode","MathML Code"],  MENU.ShowSource, {nativeTouch: true, format: "MathML"}),
        ITEM.COMMAND(["Original","Original Form"],  MENU.ShowSource, {nativeTouch: true}),
        ITEM.SUBMENU(["Annotation","Annotation"], {disabled:true}),
        ITEM.RULE(),
        ITEM.CHECKBOX(["texHints","Show TeX hints in MathML"], "texHints"),
        ITEM.CHECKBOX(["semantics","Add original form as annotation"], "semantics")
      ),
      ITEM.RULE(),
      ITEM.SUBMENU(["Settings","Math Settings"],
        ITEM.SUBMENU(["ZoomTrigger","Zoom Trigger"],
          ITEM.RADIO(["Hover","Hover"],               "zoom", {action: MENU.Zoom}),
          ITEM.RADIO(["Click","Click"],               "zoom", {action: MENU.Zoom}),
          ITEM.RADIO(["DoubleClick","Double-Click"],  "zoom", {action: MENU.Zoom}),
          ITEM.RADIO(["NoZoom","No Zoom"],            "zoom", {value: "None"}),
          ITEM.RULE(),
          ITEM.LABEL(["TriggerRequires","Trigger Requires:"]),
          ITEM.CHECKBOX((HUB.Browser.isMac ? ["Option","Option"] : ["Alt","Alt"]), "ALT"),
          ITEM.CHECKBOX(["Command","Command"],    "CMD",  {hidden: !HUB.Browser.isMac}),
          ITEM.CHECKBOX(["Control","Control"],    "CTRL", {hidden:  HUB.Browser.isMac}),
          ITEM.CHECKBOX(["Shift","Shift"],        "Shift")
        ),
        ITEM.SUBMENU(["ZoomFactor","Zoom Factor"],
          ITEM.RADIO("125%", "zscale"),
          ITEM.RADIO("133%", "zscale"),
          ITEM.RADIO("150%", "zscale"),
          ITEM.RADIO("175%", "zscale"),
          ITEM.RADIO("200%", "zscale"),
          ITEM.RADIO("250%", "zscale"),
          ITEM.RADIO("300%", "zscale"),
          ITEM.RADIO("400%", "zscale")
        ),
        ITEM.RULE(),
        ITEM.SUBMENU(["Renderer","Math Renderer"],    {hidden:!CONFIG.showRenderer},
          ITEM.RADIO(["HTML-CSS","HTML-CSS"],       "renderer", {action: MENU.Renderer}),
          ITEM.RADIO(["CommonHTML","Common HTML"],  "renderer", {action: MENU.Renderer, value:"CommonHTML"}),
          ITEM.RADIO(["PreviewHTML","Preview HTML"],"renderer", {action: MENU.Renderer, value:"PreviewHTML"}),
          ITEM.RADIO(["MathML","MathML"],           "renderer", {action: MENU.Renderer, value:"NativeMML"}),
          ITEM.RADIO(["SVG","SVG"],                 "renderer", {action: MENU.Renderer}),
          ITEM.RADIO(["PlainSource","Plain Source"],"renderer", {action: MENU.Renderer, value:"PlainSource"}),
          ITEM.RULE(),
          ITEM.CHECKBOX(["FastPreview","Fast Preview"], "FastPreview"),
          ITEM.CHECKBOX(["AssistiveMML","Assistive MathML"], "assistiveMML", {action:MENU.AssistiveMML}),
          ITEM.CHECKBOX(["InTabOrder","Include in Tab Order"], "inTabOrder")
        ),
        ITEM.SUBMENU("MathPlayer",  {hidden:!HUB.Browser.isMSIE || !CONFIG.showMathPlayer,
                                                    disabled:!HUB.Browser.hasMathPlayer},
          ITEM.LABEL(["MPHandles","Let MathPlayer Handle:"]),
          ITEM.CHECKBOX(["MenuEvents","Menu Events"],             "mpContext", {action: MENU.MPEvents, hidden:!isIE9}),
          ITEM.CHECKBOX(["MouseEvents","Mouse Events"],           "mpMouse",   {action: MENU.MPEvents, hidden:!isIE9}),
          ITEM.CHECKBOX(["MenuAndMouse","Mouse and Menu Events"], "mpMouse",   {action: MENU.MPEvents, hidden:isIE9})
        ),
        ITEM.SUBMENU(["FontPrefs","Font Preference"],       {hidden:!CONFIG.showFontMenu},
          ITEM.LABEL(["ForHTMLCSS","For HTML-CSS:"]),
          ITEM.RADIO(["Auto","Auto"],          "font", {action: MENU.Font}),
          ITEM.RULE(),
          ITEM.RADIO(["TeXLocal","TeX (local)"],   "font", {action: MENU.Font}),
          ITEM.RADIO(["TeXWeb","TeX (web)"],       "font", {action: MENU.Font}),
          ITEM.RADIO(["TeXImage","TeX (image)"],   "font", {action: MENU.Font}),
          ITEM.RULE(),
          ITEM.RADIO(["STIXLocal","STIX (local)"], "font", {action: MENU.Font}),
          ITEM.RADIO(["STIXWeb","STIX (web)"], "font", {action: MENU.Font}),
          ITEM.RULE(),
          ITEM.RADIO(["AsanaMathWeb","Asana Math (web)"], "font", {action: MENU.Font}),
          ITEM.RADIO(["GyrePagellaWeb","Gyre Pagella (web)"], "font", {action: MENU.Font}),
          ITEM.RADIO(["GyreTermesWeb","Gyre Termes (web)"], "font", {action: MENU.Font}),
          ITEM.RADIO(["LatinModernWeb","Latin Modern (web)"], "font", {action: MENU.Font}),
          ITEM.RADIO(["NeoEulerWeb","Neo Euler (web)"], "font", {action: MENU.Font})
        ),
        ITEM.SUBMENU(["ContextMenu","Contextual Menu"],    {hidden:!CONFIG.showContext},
          ITEM.RADIO(["MathJax","MathJax"], "context"),
          ITEM.RADIO(["Browser","Browser"], "context")
        ),
        ITEM.COMMAND(["Scale","Scale All Math ..."],MENU.Scale),
        ITEM.RULE().With({hidden:!CONFIG.showDiscoverable, name:["","discover_rule"]}),
        ITEM.CHECKBOX(["Discoverable","Highlight on Hover"], "discoverable", {hidden:!CONFIG.showDiscoverable})
      ),
      ITEM.SUBMENU(["Locale","Language"],                  {hidden:!CONFIG.showLocale, ltr:true},
        ITEM.RADIO("en", "locale",  {action: MENU.Locale}),
        ITEM.RULE().With({hidden:!CONFIG.showLocaleURL, name:["","localURL_rule"]}),
        ITEM.COMMAND(["LoadLocale","Load from URL ..."], MENU.LoadLocale, {hidden:!CONFIG.showLocaleURL})
      ),
      ITEM.RULE(),
      ITEM.COMMAND(["About","About MathJax"],MENU.About),
      ITEM.COMMAND(["Help","MathJax Help"],MENU.Help)
    );

    if (MENU.isMobile) {
      (function () {
        var settings = CONFIG.settings;
        var trigger = MENU.menu.Find("Math Settings","Zoom Trigger").submenu;
        trigger.items[0].disabled = trigger.items[1].disabled = true;
        if (settings.zoom === "Hover" || settings.zoom == "Click") {settings.zoom = "None"}
        trigger.items = trigger.items.slice(0,4);

        if (navigator.appVersion.match(/[ (]Android[) ]/)) {
          MENU.ITEM.SUBMENU.Augment({marker: "\u00BB"});
        }
      })();
    }

    MENU.CreateLocaleMenu();
    MENU.CreateAnnotationMenu();
  });

  MENU.showRenderer = function (show) {
    MENU.cookie.showRenderer = CONFIG.showRenderer = show; MENU.saveCookie();
    MENU.menu.Find("Math Settings","Math Renderer").hidden = !show;
  };
  MENU.showMathPlayer = function (show) {
    MENU.cookie.showMathPlayer = CONFIG.showMathPlayer = show; MENU.saveCookie();
    MENU.menu.Find("Math Settings","MathPlayer").hidden = !show;
  };
  MENU.showFontMenu = function (show) {
    MENU.cookie.showFontMenu = CONFIG.showFontMenu = show; MENU.saveCookie();
    MENU.menu.Find("Math Settings","Font Preference").hidden = !show;
  };
  MENU.showContext = function (show) {
    MENU.cookie.showContext = CONFIG.showContext = show; MENU.saveCookie();
    MENU.menu.Find("Math Settings","Contextual Menu").hidden = !show;
  };
  MENU.showDiscoverable = function (show) {
    MENU.cookie.showDiscoverable = CONFIG.showDiscoverable = show; MENU.saveCookie();
    MENU.menu.Find("Math Settings","Highlight on Hover").hidden = !show;
    MENU.menu.Find("Math Settings","discover_rule").hidden = !show;
  };
  MENU.showLocale = function (show) {
    MENU.cookie.showLocale = CONFIG.showLocale = show; MENU.saveCookie();
    MENU.menu.Find("Language").hidden = !show;
  };

  MathJax.Hub.Register.StartupHook("HTML-CSS Jax Ready",function () {
    if (!MathJax.OutputJax["HTML-CSS"].config.imageFont)
      {MENU.menu.Find("Math Settings","Font Preference","TeX (image)").disabled = true}
  });

  /*************************************************************/

  CALLBACK.Queue(
    HUB.Register.StartupHook("End Config",{}), // wait until config is complete
    ["Styles",AJAX,CONFIG.styles],
    ["Post",HUB.Startup.signal,"MathMenu Ready"],
    ["loadComplete",AJAX,"[MathJax]/extensions/MathMenu.js"]
  );

})(MathJax.Hub,MathJax.HTML,MathJax.Ajax,MathJax.CallBack,MathJax.OutputJax);
