forum/skins/default/media/js/wmd/wmd.js

   1 jQuery.extend({createUploadIframe:function(d,b){var a="jUploadFrame"+d;if(window.ActiveXObject){var c=document.createElement('<iframe id="'+a+'" name="'+a+'" />');if(typeof b=="boolean"){c.src="javascript:false"}else{if(typeof b=="string"){c.src=b}}}else{var c=document.createElement("iframe");c.id=a;c.name=a}c.style.position="absolute";c.style.top="-1000px";c.style.left="-1000px";document.body.appendChild(c);return c},createUploadForm:function(g,b){var e="jUploadForm"+g;var a="jUploadFile"+g;var d=$('<form  action="" method="POST" name="'+e+'" id="'+e+'" enctype="multipart/form-data"></form>');var c=$("#"+b);var f=$(c).clone();$(c).attr("id",a);$(c).before(f);$(c).appendTo(d);$(d).css("position","absolute");$(d).css("top","-1200px");$(d).css("left","-1200px");$(d).appendTo("body");return d},ajaxFileUpload:function(k){k=jQuery.extend({},jQuery.ajaxSettings,k);var a=new Date().getTime();var b=jQuery.createUploadForm(a,k.fileElementId);var i=jQuery.createUploadIframe(a,k.secureuri);var h="jUploadFrame"+a;var j="jUploadForm"+a;if(k.global&&!jQuery.active++){jQuery.event.trigger("ajaxStart")}var c=false;var f={};if(k.global){jQuery.event.trigger("ajaxSend",[f,k])}var d=function(l){var p=document.getElementById(h);try{if(p.contentWindow){f.responseText=p.contentWindow.document.body?p.contentWindow.document.body.innerText:null;f.responseXML=p.contentWindow.document.XMLDocument?p.contentWindow.document.XMLDocument:p.contentWindow.document}else{if(p.contentDocument){f.responseText=p.contentDocument.document.body?p.contentDocument.document.body.textContent||document.body.innerText:null;f.responseXML=p.contentDocument.document.XMLDocument?p.contentDocument.document.XMLDocument:p.contentDocument.document}}}catch(o){jQuery.handleError(k,f,null,o)}if(f||l=="timeout"){c=true;var m;try{m=l!="timeout"?"success":"error";if(m!="error"){var n=jQuery.uploadHttpData(f,k.dataType);if(k.success){k.success(n,m)}if(k.global){jQuery.event.trigger("ajaxSuccess",[f,k])}}else{jQuery.handleError(k,f,m)}}catch(o){m="error";jQuery.handleError(k,f,m,o)}if(k.global){jQuery.event.trigger("ajaxComplete",[f,k])}if(k.global&&!--jQuery.active){jQuery.event.trigger("ajaxStop")}if(k.complete){k.complete(f,m)}jQuery(p).unbind();setTimeout(function(){try{$(p).remove();$(b).remove()}catch(q){jQuery.handleError(k,f,null,q)}},100);f=null}};if(k.timeout>0){setTimeout(function(){if(!c){d("timeout")}},k.timeout)}try{var b=$("#"+j);$(b).attr("action",k.url);$(b).attr("method","POST");$(b).attr("target",h);if(b.encoding){b.encoding="multipart/form-data"}else{b.enctype="multipart/form-data"}$(b).submit()}catch(g){jQuery.handleError(k,f,null,g)}if(window.attachEvent){document.getElementById(h).attachEvent("onload",d)}else{document.getElementById(h).addEventListener("load",d,false)}return{abort:function(){}}},uploadHttpData:function(r,type){var data=!type;data=type=="xml"||data?r.responseXML:r.responseText;if(type=="script"){jQuery.globalEval(data)}if(type=="json"){eval("data = "+data)}if(type=="html"){jQuery("<div>").html(data).evalScripts()}return data}});
   2 /*Upload call*/
   3 function ajaxFileUpload(imageUrl)
   4 {
   5   $("#loading").ajaxStart(function(){
   6       $(this).show();
   7   }).ajaxComplete(function(){
   8       $(this).hide();
   9   });
  10
  11   $("#upload").ajaxStart(function(){
  12           $(this).hide();
  13       }).ajaxComplete(function(){
  14           $(this).show();
  15       });
  16
  17       $.ajaxFileUpload
  18       (
  19         {
  20             url: scriptUrl+'upload/',
  21               secureuri:false,
  22               fileElementId:'file-upload',
  23               dataType: 'xml',
  24               success: function (data, status)
  25               {
  26                   var fileURL = $(data).find('file_url').text();
  27                   var error = $(data).find('error').text();
  28                   if(error != ''){
  29                     alert(error);
  30                   }else{
  31                     imageUrl.attr('value', appUrl + fileURL);
  32                   }
  33
  34               },
  35               error: function (data, status, e)
  36               {
  37                   alert(e);
  38               }
  39           }
  40       );
  41
  42     return false;
  43 }
  44
  45 var Attacklab = Attacklab || {};
  46
  47 Attacklab.wmdBase = function(){
  48
  49         // A few handy aliases for readability.
  50         var wmd  = top.Attacklab;
  51         var doc  = top.document;
  52         var re   = top.RegExp;
  53         var nav  = top.navigator;
  54
  55         // Some namespaces.
  56         wmd.Util = {};
  57         wmd.Position = {};
  58         wmd.Command = {};
  59         wmd.Global = {};
  60
  61         var util = wmd.Util;
  62         var position = wmd.Position;
  63         var command = wmd.Command;
  64         var global = wmd.Global;
  65
  66
  67         // Used to work around some browser bugs where we can't use feature testing.
  68         global.isIE             = /msie/.test(nav.userAgent.toLowerCase());
  69         global.isIE_5or6        = /msie 6/.test(nav.userAgent.toLowerCase()) || /msie 5/.test(nav.userAgent.toLowerCase());
  70         global.isIE_7plus       = global.isIE && !global.isIE_5or6;
  71         global.isOpera          = /opera/.test(nav.userAgent.toLowerCase());
  72         global.isKonqueror      = /konqueror/.test(nav.userAgent.toLowerCase());
  73
  74
  75         // -------------------------------------------------------------------
  76         //  YOUR CHANGES GO HERE
  77         //
  78         // I've tried to localize the things you are likely to change to
  79         // this area.
  80         // -------------------------------------------------------------------
  81
  82         // The text that appears on the upper part of the dialog box when
  83         // entering links.
  84     var imageDialogText = "<p style='margin-top: 0px'>" + $.i18n._('enter image url') + "</p>";
  85     var linkDialogText = "<p style='margin-top: 0px'>" + $.i18n._('enter url') + "</p>";
  86     var uploadImageHTML ="<div>" + $.i18n._('upload image') + "</div>" +
  87             "<input type=\"file\" name=\"file-upload\" id=\"file-upload\" size=\"26\" "+
  88             "onchange=\"return ajaxFileUpload($('#image-url'));\"/><br>" +
  89             "<img id=\"loading\" src=\"" + mediaUrl("media/images/indicator.gif") + "\" style=\"display:none;\"/>";
  90
  91         // The default text that appears in the dialog input box when entering
  92         // links.
  93         var imageDefaultText = "http://";
  94         var linkDefaultText = "http://";
  95
  96         // The location of your button images relative to the base directory.
  97         var imageDirectory = "images/";
  98
  99         // Some intervals in ms.  These can be adjusted to reduce the control's load.
 100         var previewPollInterval = 500;
 101         var pastePollInterval = 100;
 102
 103         // The link and title for the help button
 104         var helpLink = "http://wmd-editor.com/";
 105         var helpHoverTitle = "WMD website";
 106         var helpTarget = "_blank";
 107
 108         // -------------------------------------------------------------------
 109         //  END OF YOUR CHANGES
 110         // -------------------------------------------------------------------
 111
 112         // A collection of the important regions on the page.
 113         // Cached so we don't have to keep traversing the DOM.
 114         wmd.PanelCollection = function(){
 115                 this.buttonBar = doc.getElementById("wmd-button-bar");
 116                 this.preview = doc.getElementById("previewer");
 117                 this.output = doc.getElementById("wmd-output");
 118                 this.input = doc.getElementById("editor");
 119         };
 120
 121         // This PanelCollection object can't be filled until after the page
 122         // has loaded.
 123         wmd.panels = undefined;
 124
 125         // Internet explorer has problems with CSS sprite buttons that use HTML
 126         // lists.  When you click on the background image "button", IE will
 127         // select the non-existent link text and discard the selection in the
 128         // textarea.  The solution to this is to cache the textarea selection
 129         // on the button's mousedown event and set a flag.  In the part of the
 130         // code where we need to grab the selection, we check for the flag
 131         // and, if it's set, use the cached area instead of querying the
 132         // textarea.
 133         //
 134         // This ONLY affects Internet Explorer (tested on versions 6, 7
 135         // and 8) and ONLY on button clicks.  Keyboard shortcuts work
 136         // normally since the focus never leaves the textarea.
 137         wmd.ieCachedRange = null;               // cached textarea selection
 138         wmd.ieRetardedClick = false;    // flag
 139
 140         // Returns true if the DOM element is visible, false if it's hidden.
 141         // Checks if display is anything other than none.
 142         util.isVisible = function (elem) {
 143
 144             if (window.getComputedStyle) {
 145                 // Most browsers
 146                         return window.getComputedStyle(elem, null).getPropertyValue("display") !== "none";
 147                 }
 148                 else if (elem.currentStyle) {
 149                     // IE
 150                         return elem.currentStyle["display"] !== "none";
 151                 }
 152         };
 153
 154
 155         // Adds a listener callback to a DOM element which is fired on a specified
 156         // event.
 157         util.addEvent = function(elem, event, listener){
 158                 if (elem.attachEvent) {
 159                         // IE only.  The "on" is mandatory.
 160                         elem.attachEvent("on" + event, listener);
 161                 }
 162                 else {
 163                         // Other browsers.
 164                         elem.addEventListener(event, listener, false);
 165                 }
 166         };
 167
 168
 169         // Removes a listener callback from a DOM element which is fired on a specified
 170         // event.
 171         util.removeEvent = function(elem, event, listener){
 172                 if (elem.detachEvent) {
 173                         // IE only.  The "on" is mandatory.
 174                         elem.detachEvent("on" + event, listener);
 175                 }
 176                 else {
 177                         // Other browsers.
 178                         elem.removeEventListener(event, listener, false);
 179                 }
 180         };
 181
 182         // Converts \r\n and \r to \n.
 183         util.fixEolChars = function(text){
 184                 text = text.replace(/\r\n/g, "\n");
 185                 text = text.replace(/\r/g, "\n");
 186                 return text;
 187         };
 188
 189         // Extends a regular expression.  Returns a new RegExp
 190         // using pre + regex + post as the expression.
 191         // Used in a few functions where we have a base
 192         // expression and we want to pre- or append some
 193         // conditions to it (e.g. adding "$" to the end).
 194         // The flags are unchanged.
 195         //
 196         // regex is a RegExp, pre and post are strings.
 197         util.extendRegExp = function(regex, pre, post){
 198
 199                 if (pre === null || pre === undefined)
 200                 {
 201                         pre = "";
 202                 }
 203                 if(post === null || post === undefined)
 204                 {
 205                         post = "";
 206                 }
 207
 208                 var pattern = regex.toString();
 209                 var flags = "";
 210
 211                 // Replace the flags with empty space and store them.
 212                 // Technically, this can match incorrect flags like "gmm".
 213                 var result = pattern.match(/\/([gim]*)$/);
 214                 if (result === null) {
 215                         flags = result[0];
 216                 }
 217                 else {
 218                         flags = "";
 219                 }
 220
 221                 // Remove the flags and slash delimiters from the regular expression.
 222                 pattern = pattern.replace(/(^\/|\/[gim]*$)/g, "");
 223                 pattern = pre + pattern + post;
 224
 225                 return new RegExp(pattern, flags);
 226         }
 227
 228
 229         // Sets the image for a button passed to the WMD editor.
 230         // Returns a new element with the image attached.
 231         // Adds several style properties to the image.
 232         util.createImage = function(img){
 233
 234                 var imgPath = imageDirectory + img;
 235
 236                 var elem = doc.createElement("img");
 237                 elem.className = "wmd-button";
 238                 elem.src = imgPath;
 239
 240                 return elem;
 241         };
 242
 243
 244         // This simulates a modal dialog box and asks for the URL when you
 245         // click the hyperlink or image buttons.
 246         //
 247         // text: The html for the input box.
 248         // defaultInputText: The default value that appears in the input box.
 249         // makeLinkMarkdown: The function which is executed when the prompt is dismissed, either via OK or Cancel
 250         util.prompt = function(text, defaultInputText, makeLinkMarkdown){
 251
 252                 // These variables need to be declared at this level since they are used
 253                 // in multiple functions.
 254                 var dialog;                     // The dialog box.
 255                 var background;         // The background beind the dialog box.
 256                 var input;                      // The text box where you enter the hyperlink.
 257         var type = 0;
 258         // The dialog box type(0: Link, 1: Image)
 259         if(arguments.length == 4){
 260             type = arguments[3];
 261         }
 262
 263                 if (defaultInputText === undefined) {
 264                         defaultInputText = "";
 265                 }
 266
 267                 // Used as a keydown event handler. Esc dismisses the prompt.
 268                 // Key code 27 is ESC.
 269                 var checkEscape = function(key){
 270                         var code = (key.charCode || key.keyCode);
 271                         if (code === 27) {
 272                                 close(true);
 273                         }
 274                 };
 275
 276                 // Dismisses the hyperlink input box.
 277                 // isCancel is true if we don't care about the input text.
 278                 // isCancel is false if we are going to keep the text.
 279                 var close = function(isCancel){
 280                         util.removeEvent(doc.body, "keydown", checkEscape);
 281                         var text = input.value;
 282
 283                         if (isCancel){
 284                                 text = null;
 285                         }
 286                         else{
 287                                 // Fixes common pasting errors.
 288                                 text = text.replace('http://http://', 'http://');
 289                                 text = text.replace('http://https://', 'https://');
 290                                 text = text.replace('http://ftp://', 'ftp://');
 291
 292                                 if (text.indexOf('http://') === -1 && text.indexOf('ftp://') === -1 && text.indexOf('https://') === -1) {
 293                                         text = 'http://' + text;
 294                                 }
 295                         }
 296
 297                         dialog.parentNode.removeChild(dialog);
 298                         background.parentNode.removeChild(background);
 299                         makeLinkMarkdown(text);
 300                         return false;
 301                 };
 302
 303                 // Creates the background behind the hyperlink text entry box.
 304                 // Most of this has been moved to CSS but the div creation and
 305                 // browser-specific hacks remain here.
 306                 var createBackground = function(){
 307
 308                         background = doc.createElement("div");
 309                         background.className = "wmd-prompt-background";
 310                         style = background.style;
 311                         style.position = "absolute";
 312                         style.top = "0";
 313
 314                         style.zIndex = "1000";
 315
 316                         // Some versions of Konqueror don't support transparent colors
 317                         // so we make the whole window transparent.
 318                         //
 319                         // Is this necessary on modern konqueror browsers?
 320                         if (global.isKonqueror){
 321                                 style.backgroundColor = "transparent";
 322                         }
 323                         else if (global.isIE){
 324                                 style.filter = "alpha(opacity=50)";
 325                         }
 326                         else {
 327                                 style.opacity = "0.5";
 328                         }
 329
 330                         var pageSize = position.getPageSize();
 331                         style.height = pageSize[1] + "px";
 332
 333                         if(global.isIE){
 334                                 style.left = doc.documentElement.scrollLeft;
 335                                 style.width = doc.documentElement.clientWidth;
 336                         }
 337                         else {
 338                                 style.left = "0";
 339                                 style.width = "100%";
 340                         }
 341
 342                         doc.body.appendChild(background);
 343                 };
 344
 345                 // Create the text input box form/window.
 346                 var createDialog = function(){
 347
 348                         // The main dialog box.
 349                         dialog = doc.createElement("div");
 350                         dialog.className = "wmd-prompt-dialog";
 351                         dialog.style.padding = "10px;";
 352                         dialog.style.position = "fixed";
 353                         dialog.style.width = "400px";
 354                         dialog.style.zIndex = "1001";
 355
 356                         // The dialog text.
 357                         var question = doc.createElement("div");
 358                         question.innerHTML = text;
 359                         question.style.padding = "5px";
 360                         dialog.appendChild(question);
 361
 362                         // The web form container for the text box and buttons.
 363                         var form = doc.createElement("form");
 364                         form.onsubmit = function(){ return close(false); };
 365                         style = form.style;
 366                         style.padding = "0";
 367                         style.margin = "0";
 368                         style.cssFloat = "left";
 369                         style.width = "100%";
 370                         style.textAlign = "center";
 371                         style.position = "relative";
 372                         dialog.appendChild(form);
 373
 374                         // The input text box
 375                         input = doc.createElement("input");
 376             input.id = "image-url";
 377                         input.type = "text";
 378                         input.value = defaultInputText;
 379                         style = input.style;
 380                         style.display = "block";
 381                         style.width = "80%";
 382                         style.marginLeft = style.marginRight = "auto";
 383                         form.appendChild(input);
 384
 385             // The upload file input
 386             var upload = doc.createElement("div");
 387             upload.innerHTML = uploadImageHTML;
 388             upload.style.padding = "5px";
 389             form.appendChild(upload);
 390
 391                         // The ok button
 392                         var okButton = doc.createElement("input");
 393                         okButton.type = "button";
 394                         okButton.onclick = function(){ return close(false); };
 395                         okButton.value = "OK";
 396                         style = okButton.style;
 397                         style.margin = "10px";
 398                         style.display = "inline";
 399                         style.width = "7em";
 400
 401
 402                         // The cancel button
 403                         var cancelButton = doc.createElement("input");
 404                         cancelButton.type = "button";
 405                         cancelButton.onclick = function(){ return close(true); };
 406                         cancelButton.value = "Cancel";
 407                         style = cancelButton.style;
 408                         style.margin = "10px";
 409                         style.display = "inline";
 410                         style.width = "7em";
 411
 412                         // The order of these buttons is different on macs.
 413                         if (/mac/.test(nav.platform.toLowerCase())) {
 414                                 form.appendChild(cancelButton);
 415                                 form.appendChild(okButton);
 416                         }
 417                         else {
 418                                 form.appendChild(okButton);
 419                                 form.appendChild(cancelButton);
 420                         }
 421
 422                         util.addEvent(doc.body, "keydown", checkEscape);
 423                         dialog.style.top = "50%";
 424                         dialog.style.left = "50%";
 425                         dialog.style.display = "block";
 426                         if(global.isIE_5or6){
 427                                 dialog.style.position = "absolute";
 428                                 dialog.style.top = doc.documentElement.scrollTop + 200 + "px";
 429                                 dialog.style.left = "50%";
 430                         }
 431                         doc.body.appendChild(dialog);
 432
 433                         // This has to be done AFTER adding the dialog to the form if you
 434                         // want it to be centered.
 435                         dialog.style.marginTop = -(position.getHeight(dialog) / 2) + "px";
 436                         dialog.style.marginLeft = -(position.getWidth(dialog) / 2) + "px";
 437
 438                 };
 439
 440                 createBackground();
 441
 442                 // Why is this in a zero-length timeout?
 443                 // Is it working around a browser bug?
 444                 top.setTimeout(function(){
 445
 446                         createDialog();
 447
 448                         var defTextLen = defaultInputText.length;
 449                         if (input.selectionStart !== undefined) {
 450                                 input.selectionStart = 0;
 451                                 input.selectionEnd = defTextLen;
 452                         }
 453                         else if (input.createTextRange) {
 454                                 var range = input.createTextRange();
 455                                 range.collapse(false);
 456                                 range.moveStart("character", -defTextLen);
 457                                 range.moveEnd("character", defTextLen);
 458                                 range.select();
 459                         }
 460
 461                         input.focus();
 462                 }, 0);
 463         };
 464
 465
 466         // UNFINISHED
 467         // The assignment in the while loop makes jslint cranky.
 468         // I'll change it to a better loop later.
 469         position.getTop = function(elem, isInner){
 470                 var result = elem.offsetTop;
 471                 if (!isInner) {
 472                         while (elem = elem.offsetParent) {
 473                                 result += elem.offsetTop;
 474                         }
 475                 }
 476                 return result;
 477         };
 478
 479         position.getHeight = function (elem) {
 480                 return elem.offsetHeight || elem.scrollHeight;
 481         };
 482
 483         position.getWidth = function (elem) {
 484                 return elem.offsetWidth || elem.scrollWidth;
 485         };
 486
 487         position.getPageSize = function(){
 488
 489                 var scrollWidth, scrollHeight;
 490                 var innerWidth, innerHeight;
 491
 492                 // It's not very clear which blocks work with which browsers.
 493                 if(self.innerHeight && self.scrollMaxY){
 494                         scrollWidth = doc.body.scrollWidth;
 495                         scrollHeight = self.innerHeight + self.scrollMaxY;
 496                 }
 497                 else if(doc.body.scrollHeight > doc.body.offsetHeight){
 498                         scrollWidth = doc.body.scrollWidth;
 499                         scrollHeight = doc.body.scrollHeight;
 500                 }
 501                 else{
 502                         scrollWidth = doc.body.offsetWidth;
 503                         scrollHeight = doc.body.offsetHeight;
 504                 }
 505
 506                 if(self.innerHeight){
 507                         // Non-IE browser
 508                         innerWidth = self.innerWidth;
 509                         innerHeight = self.innerHeight;
 510                 }
 511                 else if(doc.documentElement && doc.documentElement.clientHeight){
 512                         // Some versions of IE (IE 6 w/ a DOCTYPE declaration)
 513                         innerWidth = doc.documentElement.clientWidth;
 514                         innerHeight = doc.documentElement.clientHeight;
 515                 }
 516                 else if(doc.body){
 517                         // Other versions of IE
 518                         innerWidth = doc.body.clientWidth;
 519                         innerHeight = doc.body.clientHeight;
 520                 }
 521
 522         var maxWidth = Math.max(scrollWidth, innerWidth);
 523         var maxHeight = Math.max(scrollHeight, innerHeight);
 524         return [maxWidth, maxHeight, innerWidth, innerHeight];
 525         };
 526
 527         // Watches the input textarea, polling at an interval and runs
 528         // a callback function if anything has changed.
 529         wmd.inputPoller = function(callback, interval){
 530
 531                 var pollerObj = this;
 532                 var inputArea = wmd.panels.input;
 533
 534                 // Stored start, end and text.  Used to see if there are changes to the input.
 535                 var lastStart;
 536                 var lastEnd;
 537                 var markdown;
 538
 539                 var killHandle; // Used to cancel monitoring on destruction.
 540                 // Checks to see if anything has changed in the textarea.
 541                 // If so, it runs the callback.
 542                 this.tick = function(){
 543
 544                         if (!util.isVisible(inputArea)) {
 545                                 return;
 546                         }
 547
 548                         // Update the selection start and end, text.
 549                         if (inputArea.selectionStart || inputArea.selectionStart === 0) {
 550                                 var start = inputArea.selectionStart;
 551                                 var end = inputArea.selectionEnd;
 552                                 if (start != lastStart || end != lastEnd) {
 553                                         lastStart = start;
 554                                         lastEnd = end;
 555
 556                                         if (markdown != inputArea.value) {
 557                                                 markdown = inputArea.value;
 558                                                 return true;
 559                                         }
 560                                 }
 561                         }
 562                         return false;
 563                 };
 564
 565
 566                 var doTickCallback = function(){
 567
 568                         if (!util.isVisible(inputArea)) {
 569                                 return;
 570                         }
 571
 572                         // If anything has changed, call the function.
 573                         if (pollerObj.tick()) {
 574                                 callback();
 575                         }
 576                 };
 577
 578                 // Set how often we poll the textarea for changes.
 579                 var assignInterval = function(){
 580                         // previewPollInterval is set at the top of the namespace.
 581                         killHandle = top.setInterval(doTickCallback, interval);
 582                 };
 583
 584                 this.destroy = function(){
 585                         top.clearInterval(killHandle);
 586                 };
 587
 588                 assignInterval();
 589         };
 590
 591         // Handles pushing and popping TextareaStates for undo/redo commands.
 592         // I should rename the stack variables to list.
 593         wmd.undoManager = function(callback){
 594
 595                 var undoObj = this;
 596                 var undoStack = []; // A stack of undo states
 597                 var stackPtr = 0; // The index of the current state
 598                 var mode = "none";
 599                 var lastState; // The last state
 600                 var poller;
 601                 var timer; // The setTimeout handle for cancelling the timer
 602                 var inputStateObj;
 603
 604                 // Set the mode for later logic steps.
 605                 var setMode = function(newMode, noSave){
 606
 607                         if (mode != newMode) {
 608                                 mode = newMode;
 609                                 if (!noSave) {
 610                                         saveState();
 611                                 }
 612                         }
 613
 614                         if (!global.isIE || mode != "moving") {
 615                                 timer = top.setTimeout(refreshState, 1);
 616                         }
 617                         else {
 618                                 inputStateObj = null;
 619                         }
 620                 };
 621
 622                 var refreshState = function(){
 623                         inputStateObj = new wmd.TextareaState();
 624                         poller.tick();
 625                         timer = undefined;
 626                 };
 627
 628                 this.setCommandMode = function(){
 629                         mode = "command";
 630                         saveState();
 631                         timer = top.setTimeout(refreshState, 0);
 632                 };
 633
 634                 this.canUndo = function(){
 635                         return stackPtr > 1;
 636                 };
 637
 638                 this.canRedo = function(){
 639                         if (undoStack[stackPtr + 1]) {
 640                                 return true;
 641                         }
 642                         return false;
 643                 };
 644
 645                 // Removes the last state and restores it.
 646                 this.undo = function(){
 647
 648                         if (undoObj.canUndo()) {
 649                                 if (lastState) {
 650                                         // What about setting state -1 to null or checking for undefined?
 651                                         lastState.restore();
 652                                         lastState = null;
 653                                 }
 654                                 else {
 655                                         undoStack[stackPtr] = new wmd.TextareaState();
 656                                         undoStack[--stackPtr].restore();
 657
 658                                         if (callback) {
 659                                                 callback();
 660                                         }
 661                                 }
 662                         }
 663
 664                         mode = "none";
 665                         wmd.panels.input.focus();
 666                         refreshState();
 667                 };
 668
 669                 // Redo an action.
 670                 this.redo = function(){
 671
 672                         if (undoObj.canRedo()) {
 673
 674                                 undoStack[++stackPtr].restore();
 675
 676                                 if (callback) {
 677                                         callback();
 678                                 }
 679                         }
 680
 681                         mode = "none";
 682                         wmd.panels.input.focus();
 683                         refreshState();
 684                 };
 685
 686                 // Push the input area state to the stack.
 687                 var saveState = function(){
 688
 689                         var currState = inputStateObj || new wmd.TextareaState();
 690
 691                         if (!currState) {
 692                                 return false;
 693                         }
 694                         if (mode == "moving") {
 695                                 if (!lastState) {
 696                                         lastState = currState;
 697                                 }
 698                                 return;
 699                         }
 700                         if (lastState) {
 701                                 if (undoStack[stackPtr - 1].text != lastState.text) {
 702                                         undoStack[stackPtr++] = lastState;
 703                                 }
 704                                 lastState = null;
 705                         }
 706                         undoStack[stackPtr++] = currState;
 707                         undoStack[stackPtr + 1] = null;
 708                         if (callback) {
 709                                 callback();
 710                         }
 711                 };
 712
 713                 var handleCtrlYZ = function(event){
 714
 715                         var handled = false;
 716
 717                         if (event.ctrlKey || event.metaKey) {
 718
 719                                 // IE and Opera do not support charCode.
 720                                 var keyCode = event.charCode || event.keyCode;
 721                                 var keyCodeChar = String.fromCharCode(keyCode);
 722
 723                                 switch (keyCodeChar) {
 724
 725                                         case "y":
 726                                                 undoObj.redo();
 727                                                 handled = true;
 728                                                 break;
 729
 730                                         case "z":
 731                                                 if (!event.shiftKey) {
 732                                                         undoObj.undo();
 733                                                 }
 734                                                 else {
 735                                                         undoObj.redo();
 736                                                 }
 737                                                 handled = true;
 738                                                 break;
 739                                 }
 740                         }
 741
 742                         if (handled) {
 743                                 if (event.preventDefault) {
 744                                         event.preventDefault();
 745                                 }
 746                                 if (top.event) {
 747                                         top.event.returnValue = false;
 748                                 }
 749                                 return;
 750                         }
 751                 };
 752
 753                 // Set the mode depending on what is going on in the input area.
 754                 var handleModeChange = function(event){
 755
 756                         if (!event.ctrlKey && !event.metaKey) {
 757
 758                                 var keyCode = event.keyCode;
 759
 760                                 if ((keyCode >= 33 && keyCode <= 40) || (keyCode >= 63232 && keyCode <= 63235)) {
 761                                         // 33 - 40: page up/dn and arrow keys
 762                                         // 63232 - 63235: page up/dn and arrow keys on safari
 763                                         setMode("moving");
 764                                 }
 765                                 else if (keyCode == 8 || keyCode == 46 || keyCode == 127) {
 766                                         // 8: backspace
 767                                         // 46: delete
 768                                         // 127: delete
 769                                         setMode("deleting");
 770                                 }
 771                                 else if (keyCode == 13) {
 772                                         // 13: Enter
 773                                         setMode("newlines");
 774                                 }
 775                                 else if (keyCode == 27) {
 776                                         // 27: escape
 777                                         setMode("escape");
 778                                 }
 779                                 else if ((keyCode < 16 || keyCode > 20) && keyCode != 91) {
 780                                         // 16-20 are shift, etc.
 781                                         // 91: left window key
 782                                         // I think this might be a little messed up since there are
 783                                         // a lot of nonprinting keys above 20.
 784                                         setMode("typing");
 785                                 }
 786                         }
 787                 };
 788
 789                 var setEventHandlers = function(){
 790
 791                         util.addEvent(wmd.panels.input, "keypress", function(event){
 792                                 // keyCode 89: y
 793                                 // keyCode 90: z
 794                                 if ((event.ctrlKey || event.metaKey) && (event.keyCode == 89 || event.keyCode == 90)) {
 795                                         event.preventDefault();
 796                                 }
 797                         });
 798
 799                         var handlePaste = function(){
 800                                 if (global.isIE || (inputStateObj && inputStateObj.text != wmd.panels.input.value)) {
 801                                         if (timer == undefined) {
 802                                                 mode = "paste";
 803                                                 saveState();
 804                                                 refreshState();
 805                                         }
 806                                 }
 807                         };
 808
 809                         // pastePollInterval is specified at the beginning of this namespace.
 810                         poller = new wmd.inputPoller(handlePaste, pastePollInterval);
 811
 812                         util.addEvent(wmd.panels.input, "keydown", handleCtrlYZ);
 813                         util.addEvent(wmd.panels.input, "keydown", handleModeChange);
 814
 815                         util.addEvent(wmd.panels.input, "mousedown", function(){
 816                                 setMode("moving");
 817                         });
 818                         wmd.panels.input.onpaste = handlePaste;
 819                         wmd.panels.input.ondrop = handlePaste;
 820                 };
 821
 822                 var init = function(){
 823                         setEventHandlers();
 824                         refreshState();
 825                         saveState();
 826                 };
 827
 828                 this.destroy = function(){
 829                         if (poller) {
 830                                 poller.destroy();
 831                         }
 832                 };
 833
 834                 init();
 835         };
 836
 837         // I think my understanding of how the buttons and callbacks are stored in the array is incomplete.
 838         wmd.editor = function(previewRefreshCallback){
 839
 840                 if (!previewRefreshCallback) {
 841                         previewRefreshCallback = function(){};
 842                 }
 843
 844                 var inputBox = wmd.panels.input;
 845
 846                 var offsetHeight = 0;
 847
 848                 var editObj = this;
 849
 850                 var mainDiv;
 851                 var mainSpan;
 852
 853                 var div; // This name is pretty ambiguous.  I should rename this.
 854
 855                 // Used to cancel recurring events from setInterval.
 856                 var creationHandle;
 857
 858                 var undoMgr; // The undo manager
 859
 860                 // Perform the button's action.
 861                 var doClick = function(button){
 862
 863                         inputBox.focus();
 864
 865                         if (button.textOp) {
 866
 867                                 if (undoMgr) {
 868                                         undoMgr.setCommandMode();
 869                                 }
 870
 871                                 var state = new wmd.TextareaState();
 872
 873                                 if (!state) {
 874                                         return;
 875                                 }
 876
 877                                 var chunks = state.getChunks();
 878
 879                                 // Some commands launch a "modal" prompt dialog.  Javascript
 880                                 // can't really make a modal dialog box and the WMD code
 881                                 // will continue to execute while the dialog is displayed.
 882                                 // This prevents the dialog pattern I'm used to and means
 883                                 // I can't do something like this:
 884                                 //
 885                                 // var link = CreateLinkDialog();
 886                                 // makeMarkdownLink(link);
 887                                 //
 888                                 // Instead of this straightforward method of handling a
 889                                 // dialog I have to pass any code which would execute
 890                                 // after the dialog is dismissed (e.g. link creation)
 891                                 // in a function parameter.
 892                                 //
 893                                 // Yes this is awkward and I think it sucks, but there's
 894                                 // no real workaround.  Only the image and link code
 895                                 // create dialogs and require the function pointers.
 896                                 var fixupInputArea = function(){
 897
 898                                         inputBox.focus();
 899
 900                                         if (chunks) {
 901                                                 state.setChunks(chunks);
 902                                         }
 903
 904                                         state.restore();
 905                                         previewRefreshCallback();
 906                                 };
 907
 908                                 var useDefaultText = true;
 909                                 var noCleanup = button.textOp(chunks, fixupInputArea, useDefaultText);
 910
 911                                 if(!noCleanup) {
 912                                         fixupInputArea();
 913                                 }
 914
 915                         }
 916
 917                         if (button.execute) {
 918                                 button.execute(editObj);
 919                         }
 920                 };
 921
 922                 var setUndoRedoButtonStates = function(){
 923                         if(undoMgr){
 924                                 setupButton(document.getElementById("wmd-undo-button"), undoMgr.canUndo());
 925                                 setupButton(document.getElementById("wmd-redo-button"), undoMgr.canRedo());
 926                         }
 927                 };
 928
 929                 var setupButton = function(button, isEnabled) {
 930
 931                         var normalYShift = "0px";
 932                         var disabledYShift = "-20px";
 933                         var highlightYShift = "-40px";
 934
 935                         if(isEnabled) {
 936                                 button.style.backgroundPosition = button.XShift + " " + normalYShift;
 937                                 button.onmouseover = function(){
 938                                         this.style.backgroundPosition = this.XShift + " " + highlightYShift;
 939                                 };
 940
 941                                 button.onmouseout = function(){
 942                                         this.style.backgroundPosition = this.XShift + " " + normalYShift;
 943                                 };
 944
 945                                 // IE tries to select the background image "button" text (it's
 946                                 // implemented in a list item) so we have to cache the selection
 947                                 // on mousedown.
 948                                 if(global.isIE) {
 949                                         button.onmousedown =  function() {
 950                                                 wmd.ieRetardedClick = true;
 951                                                 wmd.ieCachedRange = document.selection.createRange();
 952                                         };
 953                                 }
 954
 955                                 if (!button.isHelp)
 956                                 {
 957                                         button.onclick = function() {
 958                                                 if (this.onmouseout) {
 959                                                         this.onmouseout();
 960                                                 }
 961                                                 doClick(this);
 962                                                 return false;
 963                                         }
 964                                 }
 965                         }
 966                         else {
 967                                 button.style.backgroundPosition = button.XShift + " " + disabledYShift;
 968                                 button.onmouseover = button.onmouseout = button.onclick = function(){};
 969                         }
 970                 }
 971
 972                 var makeSpritedButtonRow = function(){
 973
 974                         var buttonBar = document.getElementById("wmd-button-bar");
 975
 976                         var normalYShift = "0px";
 977                         var disabledYShift = "-20px";
 978                         var highlightYShift = "-40px";
 979
 980                         var buttonRow = document.createElement("ul");
 981                         buttonRow.id = "wmd-button-row";
 982                         buttonRow = buttonBar.appendChild(buttonRow);
 983
 984
 985                         var boldButton = document.createElement("li");
 986                         boldButton.className = "wmd-button";
 987                         boldButton.id = "wmd-bold-button";
 988                         boldButton.title = "Strong <strong> Ctrl+B";
 989                         boldButton.XShift = "0px";
 990                         boldButton.textOp = command.doBold;
 991                         setupButton(boldButton, true);
 992                         buttonRow.appendChild(boldButton);
 993
 994                         var italicButton = document.createElement("li");
 995                         italicButton.className = "wmd-button";
 996                         italicButton.id = "wmd-italic-button";
 997                         italicButton.title = "Emphasis <em> Ctrl+I";
 998                         italicButton.XShift = "-20px";
 999                         italicButton.textOp = command.doItalic;
1000                         setupButton(italicButton, true);
1001                         buttonRow.appendChild(italicButton);
1002
1003                         var spacer1 = document.createElement("li");
1004                         spacer1.className = "wmd-spacer";
1005                         spacer1.id = "wmd-spacer1";
1006                         buttonRow.appendChild(spacer1);
1007
1008                         var linkButton = document.createElement("li");
1009                         linkButton.className = "wmd-button";
1010                         linkButton.id = "wmd-link-button";
1011                         linkButton.title = "Hyperlink <a> Ctrl+L";
1012                         linkButton.XShift = "-40px";
1013                         linkButton.textOp = function(chunk, postProcessing, useDefaultText){
1014                                 return command.doLinkOrImage(chunk, postProcessing, false);
1015                         };
1016                         setupButton(linkButton, true);
1017                         buttonRow.appendChild(linkButton);
1018
1019                         var quoteButton = document.createElement("li");
1020                         quoteButton.className = "wmd-button";
1021                         quoteButton.id = "wmd-quote-button";
1022                         quoteButton.title = "Blockquote <blockquote> Ctrl+Q";
1023                         quoteButton.XShift = "-60px";
1024                         quoteButton.textOp = command.doBlockquote;
1025                         setupButton(quoteButton, true);
1026                         buttonRow.appendChild(quoteButton);
1027
1028                         var codeButton = document.createElement("li");
1029                         codeButton.className = "wmd-button";
1030                         codeButton.id = "wmd-code-button";
1031                         codeButton.title = "Code Sample <pre><code> Ctrl+K";
1032                         codeButton.XShift = "-80px";
1033                         codeButton.textOp = command.doCode;
1034                         setupButton(codeButton, true);
1035                         buttonRow.appendChild(codeButton);
1036
1037                         var imageButton = document.createElement("li");
1038                         imageButton.className = "wmd-button";
1039                         imageButton.id = "wmd-image-button";
1040                         imageButton.title = "Image <img> Ctrl+G";
1041                         imageButton.XShift = "-100px";
1042                         imageButton.textOp = function(chunk, postProcessing, useDefaultText){
1043                                 return command.doLinkOrImage(chunk, postProcessing, true);
1044                         };
1045                         setupButton(imageButton, true);
1046                         buttonRow.appendChild(imageButton);
1047
1048                         var spacer2 = document.createElement("li");
1049                         spacer2.className = "wmd-spacer";
1050                         spacer2.id = "wmd-spacer2";
1051                         buttonRow.appendChild(spacer2);
1052
1053                         var olistButton = document.createElement("li");
1054                         olistButton.className = "wmd-button";
1055                         olistButton.id = "wmd-olist-button";
1056                         olistButton.title = "Numbered List <ol> Ctrl+O";
1057                         olistButton.XShift = "-120px";
1058                         olistButton.textOp = function(chunk, postProcessing, useDefaultText){
1059                                 command.doList(chunk, postProcessing, true, useDefaultText);
1060                         };
1061                         setupButton(olistButton, true);
1062                         buttonRow.appendChild(olistButton);
1063
1064                         var ulistButton = document.createElement("li");
1065                         ulistButton.className = "wmd-button";
1066                         ulistButton.id = "wmd-ulist-button";
1067                         ulistButton.title = "Bulleted List <ul> Ctrl+U";
1068                         ulistButton.XShift = "-140px";
1069                         ulistButton.textOp = function(chunk, postProcessing, useDefaultText){
1070                                 command.doList(chunk, postProcessing, false, useDefaultText);
1071                         };
1072                         setupButton(ulistButton, true);
1073                         buttonRow.appendChild(ulistButton);
1074
1075                         var headingButton = document.createElement("li");
1076                         headingButton.className = "wmd-button";
1077                         headingButton.id = "wmd-heading-button";
1078                         headingButton.title = "Heading <h1>/<h2> Ctrl+H";
1079                         headingButton.XShift = "-160px";
1080                         headingButton.textOp = command.doHeading;
1081                         setupButton(headingButton, true);
1082                         buttonRow.appendChild(headingButton);
1083
1084                         var hrButton = document.createElement("li");
1085                         hrButton.className = "wmd-button";
1086                         hrButton.id = "wmd-hr-button";
1087                         hrButton.title = "Horizontal Rule <hr> Ctrl+R";
1088                         hrButton.XShift = "-180px";
1089                         hrButton.textOp = command.doHorizontalRule;
1090                         setupButton(hrButton, true);
1091                         buttonRow.appendChild(hrButton);
1092
1093                         var spacer3 = document.createElement("li");
1094                         spacer3.className = "wmd-spacer";
1095                         spacer3.id = "wmd-spacer3";
1096                         buttonRow.appendChild(spacer3);
1097
1098                         var undoButton = document.createElement("li");
1099                         undoButton.className = "wmd-button";
1100                         undoButton.id = "wmd-undo-button";
1101                         undoButton.title = "Undo - Ctrl+Z";
1102                         undoButton.XShift = "-200px";
1103                         undoButton.execute = function(manager){
1104                                 manager.undo();
1105                         };
1106                         setupButton(undoButton, true);
1107                         buttonRow.appendChild(undoButton);
1108
1109                         var redoButton = document.createElement("li");
1110                         redoButton.className = "wmd-button";
1111                         redoButton.id = "wmd-redo-button";
1112                         redoButton.title = "Redo - Ctrl+Y";
1113                         if (/win/.test(nav.platform.toLowerCase())) {
1114                                 redoButton.title = "Redo - Ctrl+Y";
1115                         }
1116                         else {
1117                                 // mac and other non-Windows platforms
1118                                 redoButton.title = "Redo - Ctrl+Shift+Z";
1119                         }
1120                         redoButton.XShift = "-220px";
1121                         redoButton.execute = function(manager){
1122                                 manager.redo();
1123                         };
1124                         setupButton(redoButton, true);
1125                         buttonRow.appendChild(redoButton);
1126
1127                         var helpButton = document.createElement("li");
1128                         helpButton.className = "wmd-button";
1129                         helpButton.id = "wmd-help-button";
1130                         helpButton.XShift = "-240px";
1131                         helpButton.isHelp = true;
1132
1133                         var helpAnchor = document.createElement("a");
1134                         helpAnchor.href = helpLink;
1135                         helpAnchor.target = helpTarget
1136                         helpAnchor.title = helpHoverTitle;
1137                         helpButton.appendChild(helpAnchor);
1138
1139                         setupButton(helpButton, true);
1140                         buttonRow.appendChild(helpButton);
1141
1142                         setUndoRedoButtonStates();
1143                 }
1144
1145                 var setupEditor = function(){
1146
1147                         if (/\?noundo/.test(doc.location.href)) {
1148                                 wmd.nativeUndo = true;
1149                         }
1150
1151                         if (!wmd.nativeUndo) {
1152                                 undoMgr = new wmd.undoManager(function(){
1153                                         previewRefreshCallback();
1154                                         setUndoRedoButtonStates();
1155                                 });
1156                         }
1157
1158                         makeSpritedButtonRow();
1159
1160
1161                         var keyEvent = "keydown";
1162                         if (global.isOpera) {
1163                                 keyEvent = "keypress";
1164                         }
1165
1166                         util.addEvent(inputBox, keyEvent, function(key){
1167
1168                                 // Check to see if we have a button key and, if so execute the callback.
1169                                 if (key.ctrlKey || key.metaKey) {
1170
1171                                         var keyCode = key.charCode || key.keyCode;
1172                                         var keyCodeStr = String.fromCharCode(keyCode).toLowerCase();
1173
1174                                         switch(keyCodeStr) {
1175                                                 case "b":
1176                                                         doClick(document.getElementById("wmd-bold-button"));
1177                                                         break;
1178                                                 case "i":
1179                                                         doClick(document.getElementById("wmd-italic-button"));
1180                                                         break;
1181                                                 case "l":
1182                                                         doClick(document.getElementById("wmd-link-button"));
1183                                                         break;
1184                                                 case "q":
1185                                                         doClick(document.getElementById("wmd-quote-button"));
1186                                                         break;
1187                                                 case "k":
1188                                                         doClick(document.getElementById("wmd-code-button"));
1189                                                         break;
1190                                                 case "g":
1191                                                         doClick(document.getElementById("wmd-image-button"));
1192                                                         break;
1193                                                 case "o":
1194                                                         doClick(document.getElementById("wmd-olist-button"));
1195                                                         break;
1196                                                 case "u":
1197                                                         doClick(document.getElementById("wmd-ulist-button"));
1198                                                         break;
1199                                                 case "h":
1200                                                         doClick(document.getElementById("wmd-heading-button"));
1201                                                         break;
1202                                                 case "r":
1203                                                         doClick(document.getElementById("wmd-hr-button"));
1204                                                         break;
1205                                                 case "y":
1206                                                         doClick(document.getElementById("wmd-redo-button"));
1207                                                         break;
1208                                                 case "z":
1209                                                         if(key.shiftKey) {
1210                                                                 doClick(document.getElementById("wmd-redo-button"));
1211                                                         }
1212                                                         else {
1213                                                                 doClick(document.getElementById("wmd-undo-button"));
1214                                                         }
1215                                                         break;
1216                                                 default:
1217                                                         return;
1218                                         }
1219
1220
1221                                         if (key.preventDefault) {
1222                                                 key.preventDefault();
1223                                         }
1224
1225                                         if (top.event) {
1226                                                 top.event.returnValue = false;
1227                                         }
1228                                 }
1229                         });
1230
1231                         // Auto-continue lists, code blocks and block quotes when
1232                         // the enter key is pressed.
1233                         util.addEvent(inputBox, "keyup", function(key){
1234                                 if (!key.shiftKey && !key.ctrlKey && !key.metaKey) {
1235                                         var keyCode = key.charCode || key.keyCode;
1236                                         // Key code 13 is Enter
1237                                         if (keyCode === 13) {
1238                                                 fakeButton = {};
1239                                                 fakeButton.textOp = command.doAutoindent;
1240                                                 doClick(fakeButton);
1241                                         }
1242                                 }
1243                         });
1244
1245                         // Disable ESC clearing the input textarea on IE
1246                         if (global.isIE) {
1247                                 util.addEvent(inputBox, "keydown", function(key){
1248                                         var code = key.keyCode;
1249                                         // Key code 27 is ESC
1250                                         if (code === 27) {
1251                                                 return false;
1252                                         }
1253                                 });
1254                         }
1255
1256                         if (inputBox.form) {
1257                                 var submitCallback = inputBox.form.onsubmit;
1258                                 inputBox.form.onsubmit = function(){
1259                                         convertToHtml();
1260                                         if (submitCallback) {
1261                                                 return submitCallback.apply(this, arguments);
1262                                         }
1263                                 };
1264                         }
1265                 };
1266
1267                 // Convert the contents of the input textarea to HTML in the output/preview panels.
1268                 var convertToHtml = function(){
1269
1270                         if (wmd.showdown) {
1271                                 var markdownConverter = new wmd.showdown.converter();
1272                         }
1273                         var text = inputBox.value;
1274
1275                         var callback = function(){
1276                                 inputBox.value = text;
1277                         };
1278
1279                         if (!/markdown/.test(wmd.wmd_env.output.toLowerCase())) {
1280                                 if (markdownConverter) {
1281                                         inputBox.value = markdownConverter.makeHtml(text);
1282                                         top.setTimeout(callback, 0);
1283                                 }
1284                         }
1285                         return true;
1286                 };
1287
1288
1289                 this.undo = function(){
1290                         if (undoMgr) {
1291                                 undoMgr.undo();
1292                         }
1293                 };
1294
1295                 this.redo = function(){
1296                         if (undoMgr) {
1297                                 undoMgr.redo();
1298                         }
1299                 };
1300
1301                 // This is pretty useless.  The setupEditor function contents
1302                 // should just be copied here.
1303                 var init = function(){
1304                         setupEditor();
1305                 };
1306
1307                 this.destroy = function(){
1308                         if (undoMgr) {
1309                                 undoMgr.destroy();
1310                         }
1311                         if (div.parentNode) {
1312                                 div.parentNode.removeChild(div);
1313                         }
1314                         if (inputBox) {
1315                                 inputBox.style.marginTop = "";
1316                         }
1317                         top.clearInterval(creationHandle);
1318                 };
1319
1320                 init();
1321         };
1322
1323         // The input textarea state/contents.
1324         // This is used to implement undo/redo by the undo manager.
1325         wmd.TextareaState = function(){
1326
1327                 // Aliases
1328                 var stateObj = this;
1329                 var inputArea = wmd.panels.input;
1330
1331                 this.init = function() {
1332
1333                         if (!util.isVisible(inputArea)) {
1334                                 return;
1335                         }
1336
1337                         this.setInputAreaSelectionStartEnd();
1338                         this.scrollTop = inputArea.scrollTop;
1339                         if (!this.text && inputArea.selectionStart || inputArea.selectionStart === 0) {
1340                                 this.text = inputArea.value;
1341                         }
1342
1343                 }
1344
1345                 // Sets the selected text in the input box after we've performed an
1346                 // operation.
1347                 this.setInputAreaSelection = function(){
1348
1349                         if (!util.isVisible(inputArea)) {
1350                                 return;
1351                         }
1352
1353                         if (inputArea.selectionStart !== undefined && !global.isOpera) {
1354
1355                                 inputArea.focus();
1356                                 inputArea.selectionStart = stateObj.start;
1357                                 inputArea.selectionEnd = stateObj.end;
1358                                 inputArea.scrollTop = stateObj.scrollTop;
1359                         }
1360                         else if (doc.selection) {
1361
1362                                 if (doc.activeElement && doc.activeElement !== inputArea) {
1363                                         return;
1364                                 }
1365
1366                                 inputArea.focus();
1367                                 var range = inputArea.createTextRange();
1368                                 range.moveStart("character", -inputArea.value.length);
1369                                 range.moveEnd("character", -inputArea.value.length);
1370                                 range.moveEnd("character", stateObj.end);
1371                                 range.moveStart("character", stateObj.start);
1372                                 range.select();
1373                         }
1374                 };
1375
1376                 this.setInputAreaSelectionStartEnd = function(){
1377
1378                         if (inputArea.selectionStart || inputArea.selectionStart === 0) {
1379
1380                                 stateObj.start = inputArea.selectionStart;
1381                                 stateObj.end = inputArea.selectionEnd;
1382                         }
1383                         else if (doc.selection) {
1384
1385                                 stateObj.text = util.fixEolChars(inputArea.value);
1386
1387                                 // IE loses the selection in the textarea when buttons are
1388                                 // clicked.  On IE we cache the selection and set a flag
1389                                 // which we check for here.
1390                                 var range;
1391                                 if(wmd.ieRetardedClick && wmd.ieCachedRange) {
1392                                         range = wmd.ieCachedRange;
1393                                         wmd.ieRetardedClick = false;
1394                                 }
1395                                 else {
1396                                         range = doc.selection.createRange();
1397                                 }
1398
1399                                 var fixedRange = util.fixEolChars(range.text);
1400                                 var marker = "\x07";
1401                                 var markedRange = marker + fixedRange + marker;
1402                                 range.text = markedRange;
1403                                 var inputText = util.fixEolChars(inputArea.value);
1404
1405                                 range.moveStart("character", -markedRange.length);
1406                                 range.text = fixedRange;
1407
1408                                 stateObj.start = inputText.indexOf(marker);
1409                                 stateObj.end = inputText.lastIndexOf(marker) - marker.length;
1410
1411                                 var len = stateObj.text.length - util.fixEolChars(inputArea.value).length;
1412
1413                                 if (len) {
1414                                         range.moveStart("character", -fixedRange.length);
1415                                         while (len--) {
1416                                                 fixedRange += "\n";
1417                                                 stateObj.end += 1;
1418                                         }
1419                                         range.text = fixedRange;
1420                                 }
1421
1422                                 this.setInputAreaSelection();
1423                         }
1424                 };
1425
1426                 // Restore this state into the input area.
1427                 this.restore = function(){
1428
1429                         if (stateObj.text != undefined && stateObj.text != inputArea.value) {
1430                                 inputArea.value = stateObj.text;
1431                         }
1432                         this.setInputAreaSelection();
1433                         inputArea.scrollTop = stateObj.scrollTop;
1434                 };
1435
1436                 // Gets a collection of HTML chunks from the inptut textarea.
1437                 this.getChunks = function(){
1438
1439                         var chunk = new wmd.Chunks();
1440
1441                         chunk.before = util.fixEolChars(stateObj.text.substring(0, stateObj.start));
1442                         chunk.startTag = "";
1443                         chunk.selection = util.fixEolChars(stateObj.text.substring(stateObj.start, stateObj.end));
1444                         chunk.endTag = "";
1445                         chunk.after = util.fixEolChars(stateObj.text.substring(stateObj.end));
1446                         chunk.scrollTop = stateObj.scrollTop;
1447
1448                         return chunk;
1449                 };
1450
1451                 // Sets the TextareaState properties given a chunk of markdown.
1452                 this.setChunks = function(chunk){
1453
1454                         chunk.before = chunk.before + chunk.startTag;
1455                         chunk.after = chunk.endTag + chunk.after;
1456
1457                         if (global.isOpera) {
1458                                 chunk.before = chunk.before.replace(/\n/g, "\r\n");
1459                                 chunk.selection = chunk.selection.replace(/\n/g, "\r\n");
1460                                 chunk.after = chunk.after.replace(/\n/g, "\r\n");
1461                         }
1462
1463                         this.start = chunk.before.length;
1464                         this.end = chunk.before.length + chunk.selection.length;
1465                         this.text = chunk.before + chunk.selection + chunk.after;
1466                         this.scrollTop = chunk.scrollTop;
1467                 };
1468
1469                 this.init();
1470         };
1471
1472         // before: contains all the text in the input box BEFORE the selection.
1473         // after: contains all the text in the input box AFTER the selection.
1474         wmd.Chunks = function(){
1475         };
1476
1477         // startRegex: a regular expression to find the start tag
1478         // endRegex: a regular expresssion to find the end tag
1479         wmd.Chunks.prototype.findTags = function(startRegex, endRegex){
1480
1481                 var chunkObj = this;
1482                 var regex;
1483
1484                 if (startRegex) {
1485
1486                         regex = util.extendRegExp(startRegex, "", "$");
1487
1488                         this.before = this.before.replace(regex,
1489                                 function(match){
1490                                         chunkObj.startTag = chunkObj.startTag + match;
1491                                         return "";
1492                                 });
1493
1494                         regex = util.extendRegExp(startRegex, "^", "");
1495
1496                         this.selection = this.selection.replace(regex,
1497                                 function(match){
1498                                         chunkObj.startTag = chunkObj.startTag + match;
1499                                         return "";
1500                                 });
1501                 }
1502
1503                 if (endRegex) {
1504
1505                         regex = util.extendRegExp(endRegex, "", "$");
1506
1507                         this.selection = this.selection.replace(regex,
1508                                 function(match){
1509                                         chunkObj.endTag = match + chunkObj.endTag;
1510                                         return "";
1511                                 });
1512
1513                         regex = util.extendRegExp(endRegex, "^", "");
1514
1515                         this.after = this.after.replace(regex,
1516                                 function(match){
1517                                         chunkObj.endTag = match + chunkObj.endTag;
1518                                         return "";
1519                                 });
1520                 }
1521         };
1522
1523         // If remove is false, the whitespace is transferred
1524         // to the before/after regions.
1525         //
1526         // If remove is true, the whitespace disappears.
1527         wmd.Chunks.prototype.trimWhitespace = function(remove){
1528
1529                 this.selection = this.selection.replace(/^(\s*)/, "");
1530
1531                 if (!remove) {
1532                         this.before += re.$1;
1533                 }
1534
1535                 this.selection = this.selection.replace(/(\s*)$/, "");
1536
1537                 if (!remove) {
1538                         this.after = re.$1 + this.after;
1539                 }
1540         };
1541
1542
1543         wmd.Chunks.prototype.addBlankLines = function(nLinesBefore, nLinesAfter, findExtraNewlines){
1544
1545                 if (nLinesBefore === undefined) {
1546                         nLinesBefore = 1;
1547                 }
1548
1549                 if (nLinesAfter === undefined) {
1550                         nLinesAfter = 1;
1551                 }
1552
1553                 nLinesBefore++;
1554                 nLinesAfter++;
1555
1556                 var regexText;
1557                 var replacementText;
1558
1559         if (navigator.userAgent.match(/Chrome/)) {
1560             "X".match(/()./)
1561         }
1562
1563                 this.selection = this.selection.replace(/(^\n*)/, "");
1564                 this.startTag = this.startTag + re.$1;
1565                 this.selection = this.selection.replace(/(\n*$)/, "");
1566                 this.endTag = this.endTag + re.$1;
1567                 this.startTag = this.startTag.replace(/(^\n*)/, "");
1568                 this.before = this.before + re.$1;
1569                 this.endTag = this.endTag.replace(/(\n*$)/, "");
1570                 this.after = this.after + re.$1;
1571
1572                 if (this.before) {
1573
1574                         regexText = replacementText = "";
1575
1576                         while (nLinesBefore--) {
1577                                 regexText += "\\n?";
1578                                 replacementText += "\n";
1579                         }
1580
1581                         if (findExtraNewlines) {
1582                                 regexText = "\\n*";
1583                         }
1584                         this.before = this.before.replace(new re(regexText + "$", ""), replacementText);
1585                 }
1586
1587                 if (this.after) {
1588
1589                         regexText = replacementText = "";
1590
1591                         while (nLinesAfter--) {
1592                                 regexText += "\\n?";
1593                                 replacementText += "\n";
1594                         }
1595                         if (findExtraNewlines) {
1596                                 regexText = "\\n*";
1597                         }
1598
1599                         this.after = this.after.replace(new re(regexText, ""), replacementText);
1600                 }
1601         };
1602
1603         // The markdown symbols - 4 spaces = code, > = blockquote, etc.
1604         command.prefixes = "(?:\\s{4,}|\\s*>|\\s*-\\s+|\\s*\\d+\\.|=|\\+|-|_|\\*|#|\\s*\\[[^\n]]+\\]:)";
1605
1606         // Remove markdown symbols from the chunk selection.
1607         command.unwrap = function(chunk){
1608                 var txt = new re("([^\\n])\\n(?!(\\n|" + command.prefixes + "))", "g");
1609                 chunk.selection = chunk.selection.replace(txt, "$1 $2");
1610         };
1611
1612         command.wrap = function(chunk, len){
1613                 command.unwrap(chunk);
1614                 var regex = new re("(.{1," + len + "})( +|$\\n?)", "gm");
1615
1616                 chunk.selection = chunk.selection.replace(regex, function(line, marked){
1617                         if (new re("^" + command.prefixes, "").test(line)) {
1618                                 return line;
1619                         }
1620                         return marked + "\n";
1621                 });
1622
1623                 chunk.selection = chunk.selection.replace(/\s+$/, "");
1624         };
1625
1626         command.doBold = function(chunk, postProcessing, useDefaultText){
1627                 return command.doBorI(chunk, 2, "strong text");
1628         };
1629
1630         command.doItalic = function(chunk, postProcessing, useDefaultText){
1631                 return command.doBorI(chunk, 1, "emphasized text");
1632         };
1633
1634         // chunk: The selected region that will be enclosed with */**
1635         // nStars: 1 for italics, 2 for bold
1636         // insertText: If you just click the button without highlighting text, this gets inserted
1637         command.doBorI = function(chunk, nStars, insertText){
1638
1639                 // Get rid of whitespace and fix up newlines.
1640                 chunk.trimWhitespace();
1641                 chunk.selection = chunk.selection.replace(/\n{2,}/g, "\n");
1642
1643                 // Look for stars before and after.  Is the chunk already marked up?
1644                 chunk.before.search(/(\**$)/);
1645                 var starsBefore = re.$1;
1646
1647                 chunk.after.search(/(^\**)/);
1648                 var starsAfter = re.$1;
1649
1650                 var prevStars = Math.min(starsBefore.length, starsAfter.length);
1651
1652                 // Remove stars if we have to since the button acts as a toggle.
1653                 if ((prevStars >= nStars) && (prevStars != 2 || nStars != 1)) {
1654                         chunk.before = chunk.before.replace(re("[*]{" + nStars + "}$", ""), "");
1655                         chunk.after = chunk.after.replace(re("^[*]{" + nStars + "}", ""), "");
1656                 }
1657                 else if (!chunk.selection && starsAfter) {
1658                         // It's not really clear why this code is necessary.  It just moves
1659                         // some arbitrary stuff around.
1660                         chunk.after = chunk.after.replace(/^([*_]*)/, "");
1661                         chunk.before = chunk.before.replace(/(\s?)$/, "");
1662                         var whitespace = re.$1;
1663                         chunk.before = chunk.before + starsAfter + whitespace;
1664                 }
1665                 else {
1666
1667                         // In most cases, if you don't have any selected text and click the button
1668                         // you'll get a selected, marked up region with the default text inserted.
1669                         if (!chunk.selection && !starsAfter) {
1670                                 chunk.selection = insertText;
1671                         }
1672
1673                         // Add the true markup.
1674                         var markup = nStars <= 1 ? "*" : "**"; // shouldn't the test be = ?
1675                         chunk.before = chunk.before + markup;
1676                         chunk.after = markup + chunk.after;
1677                 }
1678
1679                 return;
1680         };
1681
1682         command.stripLinkDefs = function(text, defsToAdd){
1683
1684                 text = text.replace(/^[ ]{0,3}\[(\d+)\]:[ \t]*\n?[ \t]*<?(\S+?)>?[ \t]*\n?[ \t]*(?:(\n*)["(](.+?)[")][ \t]*)?(?:\n+|$)/gm,
1685                         function(totalMatch, id, link, newlines, title){
1686                                 defsToAdd[id] = totalMatch.replace(/\s*$/, "");
1687                                 if (newlines) {
1688                                         // Strip the title and return that separately.
1689                                         defsToAdd[id] = totalMatch.replace(/["(](.+?)[")]$/, "");
1690                                         return newlines + title;
1691                                 }
1692                                 return "";
1693                         });
1694
1695                 return text;
1696         };
1697
1698         command.addLinkDef = function(chunk, linkDef){
1699
1700                 var refNumber = 0; // The current reference number
1701                 var defsToAdd = {}; //
1702                 // Start with a clean slate by removing all previous link definitions.
1703                 chunk.before = command.stripLinkDefs(chunk.before, defsToAdd);
1704                 chunk.selection = command.stripLinkDefs(chunk.selection, defsToAdd);
1705                 chunk.after = command.stripLinkDefs(chunk.after, defsToAdd);
1706
1707                 var defs = "";
1708                 var regex = /(\[)((?:\[[^\]]*\]|[^\[\]])*)(\][ ]?(?:\n[ ]*)?\[)(\d+)(\])/g;
1709
1710
1711
1712                 var addDefNumber = function(def){
1713                         refNumber++;
1714                         def = def.replace(/^[ ]{0,3}\[(\d+)\]:/, "  [" + refNumber + "]:");
1715                         defs += "\n" + def;
1716                 };
1717
1718         // note that
1719         // a) the recursive call to getLink cannot go infinite, because by definition
1720         //    of regex, inner is always a proper substring of wholeMatch, and
1721         // b) more than one level of nesting is neither supported by the regex
1722         //    nor making a lot of sense (the only use case for nesting is a linked image)
1723         var getLink = function (wholeMatch, before, inner, afterInner, id, end) {
1724             inner = inner.replace(regex, getLink);
1725                         if (defsToAdd[id]) {
1726                                 addDefNumber(defsToAdd[id]);
1727                 return before + inner + afterInner + refNumber + end;
1728
1729                         }
1730                         return wholeMatch;
1731                 };
1732
1733                 chunk.before = chunk.before.replace(regex, getLink);
1734
1735                 if (linkDef) {
1736                         addDefNumber(linkDef);
1737                 }
1738                 else {
1739                         chunk.selection = chunk.selection.replace(regex, getLink);
1740                 }
1741
1742                 var refOut = refNumber;
1743
1744                 chunk.after = chunk.after.replace(regex, getLink);
1745
1746                 if (chunk.after) {
1747                         chunk.after = chunk.after.replace(/\n*$/, "");
1748                 }
1749                 if (!chunk.after) {
1750                         chunk.selection = chunk.selection.replace(/\n*$/, "");
1751                 }
1752
1753                 chunk.after += "\n\n" + defs;
1754
1755                 return refOut;
1756         };
1757
1758         command.doLinkOrImage = function(chunk, postProcessing, isImage){
1759
1760                 chunk.trimWhitespace();
1761                 chunk.findTags(/\s*!?\[/, /\][ ]?(?:\n[ ]*)?(\[.*?\])?/);
1762
1763                 if (chunk.endTag.length > 1) {
1764
1765                         chunk.startTag = chunk.startTag.replace(/!?\[/, "");
1766                         chunk.endTag = "";
1767                         command.addLinkDef(chunk, null);
1768
1769                 }
1770                 else {
1771
1772                         if (/\n\n/.test(chunk.selection)) {
1773                                 command.addLinkDef(chunk, null);
1774                                 return;
1775                         }
1776
1777                         // The function to be executed when you enter a link and press OK or Cancel.
1778                         // Marks up the link and adds the ref.
1779                         var makeLinkMarkdown = function(link){
1780
1781                                 if (link !== null) {
1782
1783                                         chunk.startTag = chunk.endTag = "";
1784                                         var linkDef = " [999]: " + link;
1785
1786                                         var num = command.addLinkDef(chunk, linkDef);
1787                                         chunk.startTag = isImage ? "![" : "[";
1788                                         chunk.endTag = "][" + num + "]";
1789
1790                                         if (!chunk.selection) {
1791                                                 if (isImage) {
1792                                                         chunk.selection = "alt text";
1793                                                 }
1794                                                 else {
1795                                                         chunk.selection = "link text";
1796                                                 }
1797                                         }
1798                                 }
1799                                 postProcessing();
1800                         };
1801
1802                         if (isImage) {
1803                                 util.prompt(imageDialogText, imageDefaultText, makeLinkMarkdown);
1804                         }
1805                         else {
1806                                 util.prompt(linkDialogText, linkDefaultText, makeLinkMarkdown);
1807                         }
1808                         return true;
1809                 }
1810         };
1811
1812         util.makeAPI = function(){
1813                 wmd.wmd = {};
1814                 wmd.wmd.editor = wmd.editor;
1815                 wmd.wmd.previewManager = wmd.previewManager;
1816         };
1817
1818         util.startEditor = function(){
1819
1820                 if (wmd.wmd_env.autostart === false) {
1821                         util.makeAPI();
1822                         return;
1823                 }
1824
1825                 var edit;               // The editor (buttons + input + outputs) - the main object.
1826                 var previewMgr; // The preview manager.
1827
1828                 // Fired after the page has fully loaded.
1829                 var loadListener = function(){
1830
1831                         wmd.panels = new wmd.PanelCollection();
1832
1833                         previewMgr = new wmd.previewManager();
1834                         var previewRefreshCallback = previewMgr.refresh;
1835
1836                         edit = new wmd.editor(previewRefreshCallback);
1837
1838                         previewMgr.refresh(true);
1839
1840                 };
1841
1842                 util.addEvent(top, "load", loadListener);
1843         };
1844
1845         wmd.previewManager = function(){
1846
1847                 var managerObj = this;
1848                 var converter;
1849                 var poller;
1850                 var timeout;
1851                 var elapsedTime;
1852                 var oldInputText;
1853                 var htmlOut;
1854                 var maxDelay = 3000;
1855                 var startType = "delayed"; // The other legal value is "manual"
1856
1857                 // Adds event listeners to elements and creates the input poller.
1858                 var setupEvents = function(inputElem, listener){
1859
1860                         util.addEvent(inputElem, "input", listener);
1861                         inputElem.onpaste = listener;
1862                         inputElem.ondrop = listener;
1863
1864                         util.addEvent(inputElem, "keypress", listener);
1865                         util.addEvent(inputElem, "keydown", listener);
1866                         // previewPollInterval is set at the top of this file.
1867                         poller = new wmd.inputPoller(listener, previewPollInterval);
1868                 };
1869
1870                 var getDocScrollTop = function(){
1871
1872                         var result = 0;
1873
1874                         if (top.innerHeight) {
1875                                 result = top.pageYOffset;
1876                         }
1877                         else
1878                                 if (doc.documentElement && doc.documentElement.scrollTop) {
1879                                         result = doc.documentElement.scrollTop;
1880                                 }
1881                                 else
1882                                         if (doc.body) {
1883                                                 result = doc.body.scrollTop;
1884                                         }
1885
1886                         return result;
1887                 };
1888
1889                 var makePreviewHtml = function(){
1890
1891                         // If there are no registered preview and output panels
1892                         // there is nothing to do.
1893                         if (!wmd.panels.preview && !wmd.panels.output) {
1894                                 return;
1895                         }
1896
1897                         var text = wmd.panels.input.value;
1898                         if (text && text == oldInputText) {
1899                                 return; // Input text hasn't changed.
1900                         }
1901                         else {
1902                                 oldInputText = text;
1903                         }
1904
1905                         var prevTime = new Date().getTime();
1906
1907                         if (!converter && wmd.showdown) {
1908                                 converter = new wmd.showdown.converter();
1909                         }
1910
1911                         if (converter) {
1912                                 text = converter.makeHtml(text);
1913                         }
1914
1915                         // Calculate the processing time of the HTML creation.
1916                         // It's used as the delay time in the event listener.
1917                         var currTime = new Date().getTime();
1918                         elapsedTime = currTime - prevTime;
1919
1920                         pushPreviewHtml(text);
1921                         htmlOut = text;
1922                 };
1923
1924                 // setTimeout is already used.  Used as an event listener.
1925                 var applyTimeout = function(){
1926
1927                         if (timeout) {
1928                                 top.clearTimeout(timeout);
1929                                 timeout = undefined;
1930                         }
1931
1932                         if (startType !== "manual") {
1933
1934                                 var delay = 0;
1935
1936                                 if (startType === "delayed") {
1937                                         delay = elapsedTime;
1938                                 }
1939
1940                                 if (delay > maxDelay) {
1941                                         delay = maxDelay;
1942                                 }
1943                                 timeout = top.setTimeout(makePreviewHtml, delay);
1944                         }
1945                 };
1946
1947                 var getScaleFactor = function(panel){
1948                         if (panel.scrollHeight <= panel.clientHeight) {
1949                                 return 1;
1950                         }
1951                         return panel.scrollTop / (panel.scrollHeight - panel.clientHeight);
1952                 };
1953
1954                 var setPanelScrollTops = function(){
1955
1956                         if (wmd.panels.preview) {
1957                                 wmd.panels.preview.scrollTop = (wmd.panels.preview.scrollHeight - wmd.panels.preview.clientHeight) * getScaleFactor(wmd.panels.preview);
1958                                 ;
1959                         }
1960
1961                         if (wmd.panels.output) {
1962                                 wmd.panels.output.scrollTop = (wmd.panels.output.scrollHeight - wmd.panels.output.clientHeight) * getScaleFactor(wmd.panels.output);
1963                                 ;
1964                         }
1965                 };
1966
1967                 this.refresh = function(requiresRefresh){
1968
1969                         if (requiresRefresh) {
1970                                 oldInputText = "";
1971                                 makePreviewHtml();
1972                         }
1973                         else {
1974                                 applyTimeout();
1975                         }
1976                 };
1977
1978                 this.processingTime = function(){
1979                         return elapsedTime;
1980                 };
1981
1982                 // The output HTML
1983                 this.output = function(){
1984                         return htmlOut;
1985                 };
1986
1987                 // The mode can be "manual" or "delayed"
1988                 this.setUpdateMode = function(mode){
1989                         startType = mode;
1990                         managerObj.refresh();
1991                 };
1992
1993                 var isFirstTimeFilled = true;
1994
1995                 var pushPreviewHtml = function(text){
1996
1997                         var emptyTop = position.getTop(wmd.panels.input) - getDocScrollTop();
1998
1999                         // Send the encoded HTML to the output textarea/div.
2000                         if (wmd.panels.output) {
2001                                 // The value property is only defined if the output is a textarea.
2002                                 if (wmd.panels.output.value !== undefined) {
2003                                         wmd.panels.output.value = text;
2004                                         wmd.panels.output.readOnly = true;
2005                                 }
2006                                 // Otherwise we are just replacing the text in a div.
2007                                 // Send the HTML wrapped in <pre><code>
2008                                 else {
2009                                         var newText = text.replace(/&/g, "&amp;");
2010                                         newText = newText.replace(/</g, "&lt;");
2011                                         wmd.panels.output.innerHTML = "<pre><code>" + newText + "</code></pre>";
2012                                 }
2013                         }
2014
2015                         if (wmd.panels.preview) {
2016                                 wmd.panels.preview.innerHTML = text;
2017                         }
2018
2019                         setPanelScrollTops();
2020
2021                         if (isFirstTimeFilled) {
2022                                 isFirstTimeFilled = false;
2023                                 return;
2024                         }
2025
2026                         var fullTop = position.getTop(wmd.panels.input) - getDocScrollTop();
2027
2028                         if (global.isIE) {
2029                                 top.setTimeout(function(){
2030                                         top.scrollBy(0, fullTop - emptyTop);
2031                                 }, 0);
2032                         }
2033                         else {
2034                                 top.scrollBy(0, fullTop - emptyTop);
2035                         }
2036                 };
2037
2038                 var init = function(){
2039
2040                         setupEvents(wmd.panels.input, applyTimeout);
2041                         makePreviewHtml();
2042
2043                         if (wmd.panels.preview) {
2044                                 wmd.panels.preview.scrollTop = 0;
2045                         }
2046                         if (wmd.panels.output) {
2047                                 wmd.panels.output.scrollTop = 0;
2048                         }
2049                 };
2050
2051                 this.destroy = function(){
2052                         if (poller) {
2053                                 poller.destroy();
2054                         }
2055                 };
2056
2057                 init();
2058         };
2059
2060         // Moves the cursor to the next line and continues lists, quotes and code.
2061         command.doAutoindent = function(chunk, postProcessing, useDefaultText){
2062
2063                 chunk.before = chunk.before.replace(/(\n|^)[ ]{0,3}([*+-]|\d+[.])[ \t]*\n$/, "\n\n");
2064                 chunk.before = chunk.before.replace(/(\n|^)[ ]{0,3}>[ \t]*\n$/, "\n\n");
2065                 chunk.before = chunk.before.replace(/(\n|^)[ \t]+\n$/, "\n\n");
2066
2067                 useDefaultText = false;
2068
2069                 if(/(\n|^)[ ]{0,3}([*+-])[ \t]+.*\n$/.test(chunk.before)){
2070                         if(command.doList){
2071                                 command.doList(chunk, postProcessing, false, true);
2072                         }
2073                 }
2074                 if(/(\n|^)[ ]{0,3}(\d+[.])[ \t]+.*\n$/.test(chunk.before)){
2075                         if(command.doList){
2076                                 command.doList(chunk, postProcessing, true, true);
2077                         }
2078                 }
2079                 if(/(\n|^)[ ]{0,3}>[ \t]+.*\n$/.test(chunk.before)){
2080                         if(command.doBlockquote){
2081                                 command.doBlockquote(chunk, postProcessing, useDefaultText);
2082                         }
2083                 }
2084                 if(/(\n|^)(\t|[ ]{4,}).*\n$/.test(chunk.before)){
2085                         if(command.doCode){
2086                                 command.doCode(chunk, postProcessing, useDefaultText);
2087                         }
2088                 }
2089         };
2090
2091         command.doBlockquote = function(chunk, postProcessing, useDefaultText){
2092
2093                 chunk.selection = chunk.selection.replace(/^(\n*)([^\r]+?)(\n*)$/,
2094                         function(totalMatch, newlinesBefore, text, newlinesAfter){
2095                                 chunk.before += newlinesBefore;
2096                                 chunk.after = newlinesAfter + chunk.after;
2097                                 return text;
2098                         });
2099
2100                 chunk.before = chunk.before.replace(/(>[ \t]*)$/,
2101                         function(totalMatch, blankLine){
2102                                 chunk.selection = blankLine + chunk.selection;
2103                                 return "";
2104                         });
2105
2106                 var defaultText = useDefaultText ? "Blockquote" : "";
2107                 chunk.selection = chunk.selection.replace(/^(\s|>)+$/ ,"");
2108                 chunk.selection = chunk.selection || defaultText;
2109
2110         // The original code uses a regular expression to find out how much of the
2111         // text *directly before* the selection already was a blockquote:
2112         /*
2113                 if(chunk.before){
2114                         chunk.before = chunk.before.replace(/\n?$/,"\n");
2115                 }
2116         chunk.before = chunk.before.replace(/(((\n|^)(\n[ \t]*)*>(.+\n)*.*)+(\n[ \t]*)*$)/,
2117                        function (totalMatch) {
2118                            chunk.startTag = totalMatch;
2119                            return "";
2120                        });
2121         */
2122         // This comes down to:
2123         // Go backwards as many lines a possible, such that each line
2124         //  a) starts with ">", or
2125         //  b) is almost empty, except for whitespace, or
2126         //  c) is preceeded by an unbroken chain of non-empty lines
2127         //     leading up to a line that starts with ">" and at least one more character
2128         // and in addition
2129         //  d) at least one line fulfills a)
2130         //
2131         // Since this is essentially a backwards-moving regex, it's susceptible to
2132         // catstrophic backtracking and can cause the browser to hang;
2133         // see e.g. http://meta.stackoverflow.com/questions/9807.
2134         //
2135         // Hence we replaced this by a simple state machine that just goes through the
2136         // lines and checks for a), b), and c).
2137
2138         var match = "";
2139         var leftOver = "";
2140         if (chunk.before) {
2141             var lines = chunk.before.replace(/\n$/, "").split("\n");
2142             var inChain = false;
2143             for (var i in lines) {
2144                 var good = false;
2145                 line = lines[i];
2146                 inChain = inChain && line.length > 0; // c) any non-empty line continues the chain
2147                 if (/^>/.test(line)) {                // a)
2148                     good = true;
2149                     if (!inChain && line.length > 1)  // c) any line that starts with ">" and has at least one more character starts the chain
2150                         inChain = true;
2151                 } else if (/^[ \t]*$/.test(line)) {   // b)
2152                     good = true;
2153                 } else {
2154                     good = inChain;                   // c) the line is not empty and does not start with ">", so it matches if and only if we're in the chain
2155                 }
2156                 if (good) {
2157                     match += line + "\n";
2158                 } else {
2159                     leftOver += match + line;
2160                     match = "\n";
2161                 }
2162             }
2163             if (!/(^|\n)>/.test(match)) {             // d)
2164                 leftOver += match;
2165                 match = "";
2166             }
2167         }
2168
2169         chunk.startTag = match;
2170         chunk.before = leftOver;
2171
2172         // end of change
2173
2174                 if(chunk.after){
2175                         chunk.after = chunk.after.replace(/^\n?/,"\n");
2176                 }
2177
2178                 chunk.after = chunk.after.replace(/^(((\n|^)(\n[ \t]*)*>(.+\n)*.*)+(\n[ \t]*)*)/,
2179                         function(totalMatch){
2180                                 chunk.endTag = totalMatch;
2181                                 return "";
2182                         });
2183
2184                 var replaceBlanksInTags = function(useBracket){
2185
2186                         var replacement = useBracket ? "> " : "";
2187
2188                         if(chunk.startTag){
2189                                 chunk.startTag = chunk.startTag.replace(/\n((>|\s)*)\n$/,
2190                                         function(totalMatch, markdown){
2191                                                 return "\n" + markdown.replace(/^[ ]{0,3}>?[ \t]*$/gm, replacement) + "\n";
2192                                         });
2193                         }
2194                         if(chunk.endTag){
2195                                 chunk.endTag = chunk.endTag.replace(/^\n((>|\s)*)\n/,
2196                                         function(totalMatch, markdown){
2197                                                 return "\n" + markdown.replace(/^[ ]{0,3}>?[ \t]*$/gm, replacement) + "\n";
2198                                         });
2199                         }
2200                 };
2201
2202                 if(/^(?![ ]{0,3}>)/m.test(chunk.selection)){
2203                         command.wrap(chunk, wmd.wmd_env.lineLength - 2);
2204                         chunk.selection = chunk.selection.replace(/^/gm, "> ");
2205                         replaceBlanksInTags(true);
2206                         chunk.addBlankLines();
2207                 }
2208                 else{
2209                         chunk.selection = chunk.selection.replace(/^[ ]{0,3}> ?/gm, "");
2210                         command.unwrap(chunk);
2211                         replaceBlanksInTags(false);
2212
2213                         if(!/^(\n|^)[ ]{0,3}>/.test(chunk.selection) && chunk.startTag){
2214                                 chunk.startTag = chunk.startTag.replace(/\n{0,2}$/, "\n\n");
2215                         }
2216
2217                         if(!/(\n|^)[ ]{0,3}>.*$/.test(chunk.selection) && chunk.endTag){
2218                                 chunk.endTag=chunk.endTag.replace(/^\n{0,2}/, "\n\n");
2219                         }
2220                 }
2221
2222                 if(!/\n/.test(chunk.selection)){
2223                         chunk.selection = chunk.selection.replace(/^(> *)/,
2224                         function(wholeMatch, blanks){
2225                                 chunk.startTag += blanks;
2226                                 return "";
2227                         });
2228                 }
2229         };
2230
2231         command.doCode = function(chunk, postProcessing, useDefaultText){
2232
2233                 var hasTextBefore = /\S[ ]*$/.test(chunk.before);
2234                 var hasTextAfter = /^[ ]*\S/.test(chunk.after);
2235
2236                 // Use 'four space' markdown if the selection is on its own
2237                 // line or is multiline.
2238                 if((!hasTextAfter && !hasTextBefore) || /\n/.test(chunk.selection)){
2239
2240                         chunk.before = chunk.before.replace(/[ ]{4}$/,
2241                                 function(totalMatch){
2242                                         chunk.selection = totalMatch + chunk.selection;
2243                                         return "";
2244                                 });
2245
2246                         var nLinesBefore = 1;
2247                         var nLinesAfter = 1;
2248
2249
2250                         if(/\n(\t|[ ]{4,}).*\n$/.test(chunk.before) || chunk.after === ""){
2251                                 nLinesBefore = 0;
2252                         }
2253                         if(/^\n(\t|[ ]{4,})/.test(chunk.after)){
2254                                 nLinesAfter = 0; // This needs to happen on line 1
2255                         }
2256
2257                         chunk.addBlankLines(nLinesBefore, nLinesAfter);
2258
2259                         if(!chunk.selection){
2260                                 chunk.startTag = "    ";
2261                                 chunk.selection = useDefaultText ? "enter code here" : "";
2262                         }
2263                         else {
2264                                 if(/^[ ]{0,3}\S/m.test(chunk.selection)){
2265                                         chunk.selection = chunk.selection.replace(/^/gm, "    ");
2266                                 }
2267                                 else{
2268                                         chunk.selection = chunk.selection.replace(/^[ ]{4}/gm, "");
2269                                 }
2270                         }
2271                 }
2272                 else{
2273                         // Use backticks (`) to delimit the code block.
2274
2275                         chunk.trimWhitespace();
2276                         chunk.findTags(/`/, /`/);
2277
2278                         if(!chunk.startTag && !chunk.endTag){
2279                                 chunk.startTag = chunk.endTag="`";
2280                                 if(!chunk.selection){
2281                                         chunk.selection = useDefaultText ? "enter code here" : "";
2282                                 }
2283                         }
2284                         else if(chunk.endTag && !chunk.startTag){
2285                                 chunk.before += chunk.endTag;
2286                                 chunk.endTag = "";
2287                         }
2288                         else{
2289                                 chunk.startTag = chunk.endTag="";
2290                         }
2291                 }
2292         };
2293
2294         command.doList = function(chunk, postProcessing, isNumberedList, useDefaultText){
2295
2296                 // These are identical except at the very beginning and end.
2297                 // Should probably use the regex extension function to make this clearer.
2298                 var previousItemsRegex = /(\n|^)(([ ]{0,3}([*+-]|\d+[.])[ \t]+.*)(\n.+|\n{2,}([*+-].*|\d+[.])[ \t]+.*|\n{2,}[ \t]+\S.*)*)\n*$/;
2299                 var nextItemsRegex = /^\n*(([ ]{0,3}([*+-]|\d+[.])[ \t]+.*)(\n.+|\n{2,}([*+-].*|\d+[.])[ \t]+.*|\n{2,}[ \t]+\S.*)*)\n*/;
2300
2301                 // The default bullet is a dash but others are possible.
2302                 // This has nothing to do with the particular HTML bullet,
2303                 // it's just a markdown bullet.
2304                 var bullet = "-";
2305
2306                 // The number in a numbered list.
2307                 var num = 1;
2308
2309                 // Get the item prefix - e.g. " 1. " for a numbered list, " - " for a bulleted list.
2310                 var getItemPrefix = function(){
2311                         var prefix;
2312                         if(isNumberedList){
2313                                 prefix = " " + num + ". ";
2314                                 num++;
2315                         }
2316                         else{
2317                                 prefix = " " + bullet + " ";
2318                         }
2319                         return prefix;
2320                 };
2321
2322                 // Fixes the prefixes of the other list items.
2323                 var getPrefixedItem = function(itemText){
2324
2325                         // The numbering flag is unset when called by autoindent.
2326                         if(isNumberedList === undefined){
2327                                 isNumberedList = /^\s*\d/.test(itemText);
2328                         }
2329
2330                         // Renumber/bullet the list element.
2331                         itemText = itemText.replace(/^[ ]{0,3}([*+-]|\d+[.])\s/gm,
2332                                 function( _ ){
2333                                         return getItemPrefix();
2334                                 });
2335
2336                         return itemText;
2337                 };
2338
2339                 chunk.findTags(/(\n|^)*[ ]{0,3}([*+-]|\d+[.])\s+/, null);
2340
2341                 if(chunk.before && !/\n$/.test(chunk.before) && !/^\n/.test(chunk.startTag)){
2342                         chunk.before += chunk.startTag;
2343                         chunk.startTag = "";
2344                 }
2345
2346                 if(chunk.startTag){
2347
2348                         var hasDigits = /\d+[.]/.test(chunk.startTag);
2349                         chunk.startTag = "";
2350                         chunk.selection = chunk.selection.replace(/\n[ ]{4}/g, "\n");
2351                         command.unwrap(chunk);
2352                         chunk.addBlankLines();
2353
2354                         if(hasDigits){
2355                                 // Have to renumber the bullet points if this is a numbered list.
2356                                 chunk.after = chunk.after.replace(nextItemsRegex, getPrefixedItem);
2357                         }
2358                         if(isNumberedList == hasDigits){
2359                                 return;
2360                         }
2361                 }
2362
2363                 var nLinesBefore = 1;
2364
2365                 chunk.before = chunk.before.replace(previousItemsRegex,
2366                         function(itemText){
2367                                 if(/^\s*([*+-])/.test(itemText)){
2368                                         bullet = re.$1;
2369                                 }
2370                                 nLinesBefore = /[^\n]\n\n[^\n]/.test(itemText) ? 1 : 0;
2371                                 return getPrefixedItem(itemText);
2372                         });
2373
2374                 if(!chunk.selection){
2375                         chunk.selection = useDefaultText ? "List item" : " ";
2376                 }
2377
2378                 var prefix = getItemPrefix();
2379
2380                 var nLinesAfter = 1;
2381
2382                 chunk.after = chunk.after.replace(nextItemsRegex,
2383                         function(itemText){
2384                                 nLinesAfter = /[^\n]\n\n[^\n]/.test(itemText) ? 1 : 0;
2385                                 return getPrefixedItem(itemText);
2386                         });
2387
2388                 chunk.trimWhitespace(true);
2389                 chunk.addBlankLines(nLinesBefore, nLinesAfter, true);
2390                 chunk.startTag = prefix;
2391                 var spaces = prefix.replace(/./g, " ");
2392                 command.wrap(chunk, wmd.wmd_env.lineLength - spaces.length);
2393                 chunk.selection = chunk.selection.replace(/\n/g, "\n" + spaces);
2394
2395         };
2396
2397         command.doHeading = function(chunk, postProcessing, useDefaultText){
2398
2399                 // Remove leading/trailing whitespace and reduce internal spaces to single spaces.
2400                 chunk.selection = chunk.selection.replace(/\s+/g, " ");
2401                 chunk.selection = chunk.selection.replace(/(^\s+|\s+$)/g, "");
2402
2403                 // If we clicked the button with no selected text, we just
2404                 // make a level 2 hash header around some default text.
2405                 if(!chunk.selection){
2406                         chunk.startTag = "## ";
2407                         chunk.selection = "Heading";
2408                         chunk.endTag = " ##";
2409                         return;
2410                 }
2411
2412                 var headerLevel = 0;            // The existing header level of the selected text.
2413
2414                 // Remove any existing hash heading markdown and save the header level.
2415                 chunk.findTags(/#+[ ]*/, /[ ]*#+/);
2416                 if(/#+/.test(chunk.startTag)){
2417                         headerLevel = re.lastMatch.length;
2418                 }
2419                 chunk.startTag = chunk.endTag = "";
2420
2421                 // Try to get the current header level by looking for - and = in the line
2422                 // below the selection.
2423                 chunk.findTags(null, /\s?(-+|=+)/);
2424                 if(/=+/.test(chunk.endTag)){
2425                         headerLevel = 1;
2426                 }
2427                 if(/-+/.test(chunk.endTag)){
2428                         headerLevel = 2;
2429                 }
2430
2431                 // Skip to the next line so we can create the header markdown.
2432                 chunk.startTag = chunk.endTag = "";
2433                 chunk.addBlankLines(1, 1);
2434
2435                 // We make a level 2 header if there is no current header.
2436                 // If there is a header level, we substract one from the header level.
2437                 // If it's already a level 1 header, it's removed.
2438                 var headerLevelToCreate = headerLevel == 0 ? 2 : headerLevel - 1;
2439
2440                 if(headerLevelToCreate > 0){
2441
2442                         // The button only creates level 1 and 2 underline headers.
2443                         // Why not have it iterate over hash header levels?  Wouldn't that be easier and cleaner?
2444                         var headerChar = headerLevelToCreate >= 2 ? "-" : "=";
2445                         var len = chunk.selection.length;
2446                         if(len > wmd.wmd_env.lineLength){
2447                                 len = wmd.wmd_env.lineLength;
2448                         }
2449                         chunk.endTag = "\n";
2450                         while(len--){
2451                                 chunk.endTag += headerChar;
2452                         }
2453                 }
2454         };
2455
2456         command.doHorizontalRule = function(chunk, postProcessing, useDefaultText){
2457                 chunk.startTag = "----------\n";
2458                 chunk.selection = "";
2459                 chunk.addBlankLines(2, 1, true);
2460         }
2461 };
2462
2463
2464 Attacklab.wmd_env = {};
2465 Attacklab.account_options = {};
2466 Attacklab.wmd_defaults = {version:1, output:"HTML", lineLength:40, delayLoad:false};
2467
2468 if(!Attacklab.wmd)
2469 {
2470         Attacklab.wmd = function()
2471         {
2472                 Attacklab.loadEnv = function()
2473                 {
2474                         var mergeEnv = function(env)
2475                         {
2476                                 if(!env)
2477                                 {
2478                                         return;
2479                                 }
2480
2481                                 for(var key in env)
2482                                 {
2483                                         Attacklab.wmd_env[key] = env[key];
2484                                 }
2485                         };
2486
2487                         mergeEnv(Attacklab.wmd_defaults);
2488                         mergeEnv(Attacklab.account_options);
2489                         mergeEnv(top["wmd_options"]);
2490                         Attacklab.full = true;
2491
2492                         var defaultButtons = "bold italic link blockquote code image ol ul heading hr";
2493                         Attacklab.wmd_env.buttons = Attacklab.wmd_env.buttons || defaultButtons;
2494                 };
2495                 Attacklab.loadEnv();
2496
2497         };
2498
2499         Attacklab.wmd();
2500         Attacklab.wmdBase();
2501         Attacklab.Util.startEditor();
2502 };
2503