resources/mediawiki/mediawiki.js

   1 /*
   2  * Core MediaWiki JavaScript Library
   3  */
   4
   5 var mw = ( function ( $, undefined ) {
   6 "use strict";
   7
   8         /* Private Members */
   9
  10         var hasOwn = Object.prototype.hasOwnProperty;
  11         /* Object constructors */
  12
  13         /**
  14          * Map
  15          *
  16          * Creates an object that can be read from or written to from prototype functions
  17          * that allow both single and multiple variables at once.
  18          *
  19          * @param global boolean Whether to store the values in the global window
  20          *  object or a exclusively in the object property 'values'.
  21          * @return Map
  22          */
  23         function Map( global ) {
  24                 this.values = global === true ? window : {};
  25                 return this;
  26         }
  27
  28         Map.prototype = {
  29                 /**
  30                  * Get the value of one or multiple a keys.
  31                  *
  32                  * If called with no arguments, all values will be returned.
  33                  *
  34                  * @param selection mixed String key or array of keys to get values for.
  35                  * @param fallback mixed Value to use in case key(s) do not exist (optional).
  36                  * @return mixed If selection was a string returns the value or null,
  37                  *  If selection was an array, returns an object of key/values (value is null if not found),
  38                  *  If selection was not passed or invalid, will return the 'values' object member (be careful as
  39                  *  objects are always passed by reference in JavaScript!).
  40                  * @return Values as a string or object, null if invalid/inexistant.
  41                  */
  42                 get: function ( selection, fallback ) {
  43                         var results, i;
  44
  45                         if ( $.isArray( selection ) ) {
  46                                 selection = $.makeArray( selection );
  47                                 results = {};
  48                                 for ( i = 0; i < selection.length; i += 1 ) {
  49                                         results[selection[i]] = this.get( selection[i], fallback );
  50                                 }
  51                                 return results;
  52                         } else if ( typeof selection === 'string' ) {
  53                                 if ( this.values[selection] === undefined ) {
  54                                         if ( fallback !== undefined ) {
  55                                                 return fallback;
  56                                         }
  57                                         return null;
  58                                 }
  59                                 return this.values[selection];
  60                         }
  61                         if ( selection === undefined ) {
  62                                 return this.values;
  63                         } else {
  64                                 return null; // invalid selection key
  65                         }
  66                 },
  67
  68                 /**
  69                  * Sets one or multiple key/value pairs.
  70                  *
  71                  * @param selection {mixed} String key or array of keys to set values for.
  72                  * @param value {mixed} Value to set (optional, only in use when key is a string)
  73                  * @return {Boolean} This returns true on success, false on failure.
  74                  */
  75                 set: function ( selection, value ) {
  76                         var s;
  77
  78                         if ( $.isPlainObject( selection ) ) {
  79                                 for ( s in selection ) {
  80                                         this.values[s] = selection[s];
  81                                 }
  82                                 return true;
  83                         } else if ( typeof selection === 'string' && value !== undefined ) {
  84                                 this.values[selection] = value;
  85                                 return true;
  86                         }
  87                         return false;
  88                 },
  89
  90                 /**
  91                  * Checks if one or multiple keys exist.
  92                  *
  93                  * @param selection {mixed} String key or array of keys to check
  94                  * @return {Boolean} Existence of key(s)
  95                  */
  96                 exists: function ( selection ) {
  97                         var s;
  98
  99                         if ( $.isArray( selection ) ) {
 100                                 for ( s = 0; s < selection.length; s += 1 ) {
 101                                         if ( this.values[selection[s]] === undefined ) {
 102                                                 return false;
 103                                         }
 104                                 }
 105                                 return true;
 106                         } else {
 107                                 return this.values[selection] !== undefined;
 108                         }
 109                 }
 110         };
 111
 112         /**
 113          * Message
 114          *
 115          * Object constructor for messages,
 116          * similar to the Message class in MediaWiki PHP.
 117          *
 118          * @param map Map Instance of mw.Map
 119          * @param key String
 120          * @param parameters Array
 121          * @return Message
 122          */
 123         function Message( map, key, parameters ) {
 124                 this.format = 'plain';
 125                 this.map = map;
 126                 this.key = key;
 127                 this.parameters = parameters === undefined ? [] : $.makeArray( parameters );
 128                 return this;
 129         }
 130
 131         Message.prototype = {
 132                 /**
 133                  * Simple message parser, does $N replacement and nothing else.
 134                  * This may be overridden to provide a more complex message parser.
 135                  *
 136                  * This function will not be called for nonexistent messages.
 137                  */
 138                 parser: function() {
 139                         var parameters = this.parameters;
 140                         return this.map.get( this.key ).replace( /\$(\d+)/g, function ( str, match ) {
 141                                 var index = parseInt( match, 10 ) - 1;
 142                                 return parameters[index] !== undefined ? parameters[index] : '$' + match;
 143                         } );
 144                 },
 145
 146                 /**
 147                  * Appends (does not replace) parameters for replacement to the .parameters property.
 148                  *
 149                  * @param parameters Array
 150                  * @return Message
 151                  */
 152                 params: function ( parameters ) {
 153                         var i;
 154                         for ( i = 0; i < parameters.length; i += 1 ) {
 155                                 this.parameters.push( parameters[i] );
 156                         }
 157                         return this;
 158                 },
 159
 160                 /**
 161                  * Converts message object to it's string form based on the state of format.
 162                  *
 163                  * @return string Message as a string in the current form or <key> if key does not exist.
 164                  */
 165                 toString: function() {
 166                         if ( !this.exists( ) ) {
 167                                 // Use <key> as text if key does not exist
 168                                 if ( this.format !== 'plain' ) {
 169                                         // format 'escape' and 'parse' need to have the brackets and key html escaped
 170                                         return mw.html.escape( '<' + this.key + '>' );
 171                                 }
 172                                 return '<' + this.key + '>';
 173                         }
 174
 175                         var text;
 176                         if ( this.format === 'plain' ) {
 177                                 // FIXME this is wrong. There should be a way
 178                                 // to tell parser() whether we're looking for
 179                                 // plain text or HTML, but I don't know jQueryMsg
 180                                 // well enough to implement this.
 181                                 // Currently it always outputs HTML
 182                                 text = this.parser();
 183                         }
 184
 185                         if ( this.format === 'escaped' ) {
 186                                 text = this.parser();
 187                                 text = mw.html.escape( text );
 188                         }
 189
 190                         if ( this.format === 'parse' ) {
 191                                 text = this.parser();
 192                         }
 193
 194                         return text;
 195                 },
 196
 197                 /**
 198                  * Changes format to parse and converts message to string
 199                  *
 200                  * @return {string} String form of parsed message
 201                  */
 202                 parse: function() {
 203                         this.format = 'parse';
 204                         return this.toString();
 205                 },
 206
 207                 /**
 208                  * Changes format to plain and converts message to string
 209                  *
 210                  * @return {string} String form of plain message
 211                  */
 212                 plain: function() {
 213                         this.format = 'plain';
 214                         return this.toString();
 215                 },
 216
 217                 /**
 218                  * Changes the format to html escaped and converts message to string
 219                  *
 220                  * @return {string} String form of html escaped message
 221                  */
 222                 escaped: function() {
 223                         this.format = 'escaped';
 224                         return this.toString();
 225                 },
 226
 227                 /**
 228                  * Checks if message exists
 229                  *
 230                  * @return {string} String form of parsed message
 231                  */
 232                 exists: function() {
 233                         return this.map.exists( this.key );
 234                 }
 235         };
 236
 237         return {
 238                 /* Public Members */
 239
 240                 /**
 241                  * Dummy function which in debug mode can be replaced with a function that
 242                  * emulates console.log in console-less environments.
 243                  */
 244                 log: function() { },
 245
 246                 /**
 247                  * @var constructor Make the Map constructor publicly available.
 248                  */
 249                 Map: Map,
 250
 251                 /**
 252                  * @var constructor Make the Message constructor publicly available.
 253                  */
 254                 Message: Message,
 255
 256                 /**
 257                  * List of configuration values
 258                  *
 259                  * Dummy placeholder. Initiated in startUp module as a new instance of mw.Map().
 260                  * If $wgLegacyJavaScriptGlobals is true, this Map will have its values
 261                  * in the global window object.
 262                  */
 263                 config: null,
 264
 265                 /**
 266                  * @var object
 267                  *
 268                  * Empty object that plugins can be installed in.
 269                  */
 270                 libs: {},
 271
 272                 /* Extension points */
 273
 274                 legacy: {},
 275
 276                 /**
 277                  * Localization system
 278                  */
 279                 messages: new Map(),
 280
 281                 /* Public Methods */
 282
 283                 /**
 284                  * Gets a message object, similar to wfMessage()
 285                  *
 286                  * @param key string Key of message to get
 287                  * @param parameter_1 mixed First argument in a list of variadic arguments,
 288                  *  each a parameter for $N replacement in messages.
 289                  * @return Message
 290                  */
 291                 message: function ( key, parameter_1 /* [, parameter_2] */ ) {
 292                         var parameters;
 293                         // Support variadic arguments
 294                         if ( parameter_1 !== undefined ) {
 295                                 parameters = $.makeArray( arguments );
 296                                 parameters.shift();
 297                         } else {
 298                                 parameters = [];
 299                         }
 300                         return new Message( mw.messages, key, parameters );
 301                 },
 302
 303                 /**
 304                  * Gets a message string, similar to wfMsg()
 305                  *
 306                  * @param key string Key of message to get
 307                  * @param parameters mixed First argument in a list of variadic arguments,
 308                  *  each a parameter for $N replacement in messages.
 309                  * @return String.
 310                  */
 311                 msg: function ( key, parameters ) {
 312                         return mw.message.apply( mw.message, arguments ).toString();
 313                 },
 314
 315                 /**
 316                  * Client-side module loader which integrates with the MediaWiki ResourceLoader
 317                  */
 318                 loader: ( function() {
 319
 320                         /* Private Members */
 321
 322                         /**
 323                          * Mapping of registered modules
 324                          *
 325                          * The jquery module is pre-registered, because it must have already
 326                          * been provided for this object to have been built, and in debug mode
 327                          * jquery would have been provided through a unique loader request,
 328                          * making it impossible to hold back registration of jquery until after
 329                          * mediawiki.
 330                          *
 331                          * For exact details on support for script, style and messages, look at
 332                          * mw.loader.implement.
 333                          *
 334                          * Format:
 335                          *      {
 336                          *              'moduleName': {
 337                          *                      'version': ############## (unix timestamp),
 338                          *                      'dependencies': ['required.foo', 'bar.also', ...], (or) function() {}
 339                          *                      'group': 'somegroup', (or) null,
 340                          *                      'source': 'local', 'someforeignwiki', (or) null
 341                          *                      'state': 'registered', 'loading', 'loaded', 'ready', 'error' or 'missing'
 342                          *                      'script': ...,
 343                          *                      'style': ...,
 344                          *                      'messages': { 'key': 'value' },
 345                          *              }
 346                          *      }
 347                          */
 348                         var     registry = {},
 349                                 /**
 350                                  * Mapping of sources, keyed by source-id, values are objects.
 351                                  * Format:
 352                                  *      {
 353                                  *              'sourceId': {
 354                                  *                      'loadScript': 'http://foo.bar/w/load.php'
 355                                  *              }
 356                                  *      }
 357                                  */
 358                                 sources = {},
 359                                 // List of modules which will be loaded as when ready
 360                                 batch = [],
 361                                 // List of modules to be loaded
 362                                 queue = [],
 363                                 // List of callback functions waiting for modules to be ready to be called
 364                                 jobs = [],
 365                                 // Flag indicating that document ready has occured
 366                                 ready = false,
 367                                 // Whether we should try to load scripts in a blocking way
 368                                 // Set with setBlocking()
 369                                 blocking = false,
 370                                 // Selector cache for the marker element. Use getMarker() to get/use the marker!
 371                                 $marker = null;
 372
 373                         /* Cache document ready status */
 374
 375                         $(document).ready( function () {
 376                                 ready = true;
 377                         } );
 378
 379                         /* Private methods */
 380
 381                         function getMarker(){
 382                                 // Cached ?
 383                                 if ( $marker ) {
 384                                         return $marker;
 385                                 } else {
 386                                         $marker = $( 'meta[name="ResourceLoaderDynamicStyles"]' );
 387                                         if ( $marker.length ) {
 388                                                 return $marker;
 389                                         }
 390                                         mw.log( 'getMarker> No <meta name="ResourceLoaderDynamicStyles"> found, inserting dynamically.' );
 391                                         $marker = $( '<meta>' ).attr( 'name', 'ResourceLoaderDynamicStyles' ).appendTo( 'head' );
 392                                         return $marker;
 393                                 }
 394                         }
 395
 396                         function compare( a, b ) {
 397                                 var i;
 398                                 if ( a.length !== b.length ) {
 399                                         return false;
 400                                 }
 401                                 for ( i = 0; i < b.length; i += 1 ) {
 402                                         if ( $.isArray( a[i] ) ) {
 403                                                 if ( !compare( a[i], b[i] ) ) {
 404                                                         return false;
 405                                                 }
 406                                         }
 407                                         if ( a[i] !== b[i] ) {
 408                                                 return false;
 409                                         }
 410                                 }
 411                                 return true;
 412                         }
 413
 414                         /**
 415                          * Generates an ISO8601 "basic" string from a UNIX timestamp
 416                          */
 417                         function formatVersionNumber( timestamp ) {
 418                                 var     pad = function ( a, b, c ) {
 419                                                 return [a < 10 ? '0' + a : a, b < 10 ? '0' + b : b, c < 10 ? '0' + c : c].join( '' );
 420                                         },
 421                                         d = new Date();
 422                                 d.setTime( timestamp * 1000 );
 423                                 return [
 424                                         pad( d.getUTCFullYear(), d.getUTCMonth() + 1, d.getUTCDate() ), 'T',
 425                                         pad( d.getUTCHours(), d.getUTCMinutes(), d.getUTCSeconds() ), 'Z'
 426                                 ].join( '' );
 427                         }
 428
 429                         /**
 430                          * Recursively resolves dependencies and detects circular references
 431                          */
 432                         function recurse( module, resolved, unresolved ) {
 433                                 var n, deps, len;
 434
 435                                 if ( registry[module] === undefined ) {
 436                                         throw new Error( 'Unknown dependency: ' + module );
 437                                 }
 438                                 // Resolves dynamic loader function and replaces it with its own results
 439                                 if ( $.isFunction( registry[module].dependencies ) ) {
 440                                         registry[module].dependencies = registry[module].dependencies();
 441                                         // Ensures the module's dependencies are always in an array
 442                                         if ( typeof registry[module].dependencies !== 'object' ) {
 443                                                 registry[module].dependencies = [registry[module].dependencies];
 444                                         }
 445                                 }
 446                                 // Tracks down dependencies
 447                                 deps = registry[module].dependencies;
 448                                 len = deps.length;
 449                                 for ( n = 0; n < len; n += 1 ) {
 450                                         if ( $.inArray( deps[n], resolved ) === -1 ) {
 451                                                 if ( $.inArray( deps[n], unresolved ) !== -1 ) {
 452                                                         throw new Error(
 453                                                                 'Circular reference detected: ' + module +
 454                                                                 ' -> ' + deps[n]
 455                                                         );
 456                                                 }
 457
 458                                                 // Add to unresolved
 459                                                 unresolved[unresolved.length] = module;
 460                                                 recurse( deps[n], resolved, unresolved );
 461                                                 // module is at the end of unresolved
 462                                                 unresolved.pop();
 463                                         }
 464                                 }
 465                                 resolved[resolved.length] = module;
 466                         }
 467
 468                         /**
 469                          * Gets a list of module names that a module depends on in their proper dependency order
 470                          *
 471                          * @param module string module name or array of string module names
 472                          * @return list of dependencies, including 'module'.
 473                          * @throws Error if circular reference is detected
 474                          */
 475                         function resolve( module ) {
 476                                 var modules, m, deps, n, resolved;
 477
 478                                 // Allow calling with an array of module names
 479                                 if ( $.isArray( module ) ) {
 480                                         modules = [];
 481                                         for ( m = 0; m < module.length; m += 1 ) {
 482                                                 deps = resolve( module[m] );
 483                                                 for ( n = 0; n < deps.length; n += 1 ) {
 484                                                         modules[modules.length] = deps[n];
 485                                                 }
 486                                         }
 487                                         return modules;
 488                                 } else if ( typeof module === 'string' ) {
 489                                         resolved = [];
 490                                         recurse( module, resolved, [] );
 491                                         return resolved;
 492                                 }
 493                                 throw new Error( 'Invalid module argument: ' + module );
 494                         }
 495
 496                         /**
 497                          * Narrows a list of module names down to those matching a specific
 498                          * state (see comment on top of this scope for a list of valid states).
 499                          * One can also filter for 'unregistered', which will return the
 500                          * modules names that don't have a registry entry.
 501                          *
 502                          * @param states string or array of strings of module states to filter by
 503                          * @param modules array list of module names to filter (optional, by default the entire
 504                          * registry is used)
 505                          * @return array list of filtered module names
 506                          */
 507                         function filter( states, modules ) {
 508                                 var list, module, s, m;
 509
 510                                 // Allow states to be given as a string
 511                                 if ( typeof states === 'string' ) {
 512                                         states = [states];
 513                                 }
 514                                 // If called without a list of modules, build and use a list of all modules
 515                                 list = [];
 516                                 if ( modules === undefined ) {
 517                                         modules = [];
 518                                         for ( module in registry ) {
 519                                                 modules[modules.length] = module;
 520                                         }
 521                                 }
 522                                 // Build a list of modules which are in one of the specified states
 523                                 for ( s = 0; s < states.length; s += 1 ) {
 524                                         for ( m = 0; m < modules.length; m += 1 ) {
 525                                                 if ( registry[modules[m]] === undefined ) {
 526                                                         // Module does not exist
 527                                                         if ( states[s] === 'unregistered' ) {
 528                                                                 // OK, undefined
 529                                                                 list[list.length] = modules[m];
 530                                                         }
 531                                                 } else {
 532                                                         // Module exists, check state
 533                                                         if ( registry[modules[m]].state === states[s] ) {
 534                                                                 // OK, correct state
 535                                                                 list[list.length] = modules[m];
 536                                                         }
 537                                                 }
 538                                         }
 539                                 }
 540                                 return list;
 541                         }
 542
 543                         /**
 544                          * Automatically executes jobs and modules which are pending with satistifed dependencies.
 545                          *
 546                          * This is used when dependencies are satisfied, such as when a module is executed.
 547                          */
 548                         function handlePending( module ) {
 549                                 var j, r;
 550
 551                                 try {
 552                                         // Run jobs who's dependencies have just been met
 553                                         for ( j = 0; j < jobs.length; j += 1 ) {
 554                                                 if ( compare(
 555                                                         filter( 'ready', jobs[j].dependencies ),
 556                                                         jobs[j].dependencies ) )
 557                                                 {
 558                                                         if ( $.isFunction( jobs[j].ready ) ) {
 559                                                                 jobs[j].ready();
 560                                                         }
 561                                                         jobs.splice( j, 1 );
 562                                                         j -= 1;
 563                                                 }
 564                                         }
 565                                         // Execute modules who's dependencies have just been met
 566                                         for ( r in registry ) {
 567                                                 if ( registry[r].state === 'loaded' ) {
 568                                                         if ( compare(
 569                                                                 filter( ['ready'], registry[r].dependencies ),
 570                                                                 registry[r].dependencies ) )
 571                                                         {
 572                                                                 execute( r );
 573                                                         }
 574                                                 }
 575                                         }
 576                                 } catch ( e ) {
 577                                         // Run error callbacks of jobs affected by this condition
 578                                         for ( j = 0; j < jobs.length; j += 1 ) {
 579                                                 if ( $.inArray( module, jobs[j].dependencies ) !== -1 ) {
 580                                                         if ( $.isFunction( jobs[j].error ) ) {
 581                                                                 jobs[j].error( e, module );
 582                                                         }
 583                                                         jobs.splice( j, 1 );
 584                                                         j -= 1;
 585                                                 }
 586                                         }
 587                                 }
 588                         }
 589
 590                         /**
 591                          * Adds a script tag to the DOM, either using document.write or low-level DOM manipulation,
 592                          * depending on whether document-ready has occured yet and whether we are in blocking mode.
 593                          *
 594                          * @param src String: URL to script, will be used as the src attribute in the script tag
 595                          * @param callback Function: Optional callback which will be run when the script is done
 596                          */
 597                         function addScript( src, callback ) {
 598                                 var done = false, script, head;
 599                                 if ( ready || !blocking ) {
 600                                         // jQuery's getScript method is NOT better than doing this the old-fashioned way
 601                                         // because jQuery will eval the script's code, and errors will not have sane
 602                                         // line numbers.
 603                                         script = document.createElement( 'script' );
 604                                         script.setAttribute( 'src', src );
 605                                         script.setAttribute( 'type', 'text/javascript' );
 606                                         if ( $.isFunction( callback ) ) {
 607                                                 // Attach handlers for all browsers (based on jQuery.ajax)
 608                                                 script.onload = script.onreadystatechange = function() {
 609
 610                                                         if (
 611                                                                 !done
 612                                                                 && (
 613                                                                         !script.readyState
 614                                                                         || /loaded|complete/.test( script.readyState )
 615                                                                 )
 616                                                         ) {
 617
 618                                                                 done = true;
 619
 620                                                                 // Handle memory leak in IE
 621                                                                 script.onload = script.onreadystatechange = null;
 622
 623                                                                 callback();
 624
 625                                                                 if ( script.parentNode ) {
 626                                                                         script.parentNode.removeChild( script );
 627                                                                 }
 628
 629                                                                 // Dereference the script
 630                                                                 script = undefined;
 631                                                         }
 632                                                 };
 633                                         }
 634                                         // IE-safe way of getting the <head> . document.documentElement.head doesn't
 635                                         // work in scripts that run in the <head>
 636                                         head = document.getElementsByTagName( 'head' )[0];
 637                                         // Append to the <body> if available, to the <head> otherwise
 638                                         (document.body || head).appendChild( script );
 639                                 } else {
 640                                         document.write( mw.html.element(
 641                                                 'script', { 'type': 'text/javascript', 'src': src }, ''
 642                                         ) );
 643                                         if ( $.isFunction( callback ) ) {
 644                                                 // Document.write is synchronous, so this is called when it's done
 645                                                 // FIXME: that's a lie. doc.write isn't actually synchronous
 646                                                 callback();
 647                                         }
 648                                 }
 649                         }
 650
 651                         /**
 652                          * Executes a loaded module, making it ready to use
 653                          *
 654                          * @param module string module name to execute
 655                          */
 656                         function execute( module, callback ) {
 657                                 var style, media, i, script, markModuleReady, nestedAddScript;
 658
 659                                 if ( registry[module] === undefined ) {
 660                                         throw new Error( 'Module has not been registered yet: ' + module );
 661                                 } else if ( registry[module].state === 'registered' ) {
 662                                         throw new Error( 'Module has not been requested from the server yet: ' + module );
 663                                 } else if ( registry[module].state === 'loading' ) {
 664                                         throw new Error( 'Module has not completed loading yet: ' + module );
 665                                 } else if ( registry[module].state === 'ready' ) {
 666                                         throw new Error( 'Module has already been loaded: ' + module );
 667                                 }
 668
 669                                 // Add styles
 670                                 if ( $.isPlainObject( registry[module].style ) ) {
 671                                         for ( media in registry[module].style ) {
 672                                                 style = registry[module].style[media];
 673                                                 if ( $.isArray( style ) ) {
 674                                                         for ( i = 0; i < style.length; i += 1 ) {
 675                                                                 getMarker().before( mw.html.element( 'link', {
 676                                                                         'type': 'text/css',
 677                                                                         'media': media,
 678                                                                         'rel': 'stylesheet',
 679                                                                         'href': style[i]
 680                                                                 } ) );
 681                                                         }
 682                                                 } else if ( typeof style === 'string' ) {
 683                                                         getMarker().before( mw.html.element( 'style', {
 684                                                                 'type': 'text/css',
 685                                                                 'media': media
 686                                                         }, new mw.html.Cdata( style ) ) );
 687                                                 }
 688                                         }
 689                                 }
 690                                 // Add localizations to message system
 691                                 if ( $.isPlainObject( registry[module].messages ) ) {
 692                                         mw.messages.set( registry[module].messages );
 693                                 }
 694                                 // Execute script
 695                                 try {
 696                                         script = registry[module].script;
 697                                         markModuleReady = function() {
 698                                                 registry[module].state = 'ready';
 699                                                 handlePending( module );
 700                                                 if ( $.isFunction( callback ) ) {
 701                                                         callback();
 702                                                 }
 703                                         };
 704                                         nestedAddScript = function ( arr, callback, i ) {
 705                                                 // Recursively call addScript() in its own callback
 706                                                 // for each element of arr.
 707                                                 if ( i >= arr.length ) {
 708                                                         // We're at the end of the array
 709                                                         callback();
 710                                                         return;
 711                                                 }
 712
 713                                                 addScript( arr[i], function() {
 714                                                         nestedAddScript( arr, callback, i + 1 );
 715                                                 } );
 716                                         };
 717
 718                                         if ( $.isArray( script ) ) {
 719                                                 registry[module].state = 'loading';
 720                                                 nestedAddScript( script, markModuleReady, 0 );
 721                                         } else if ( $.isFunction( script ) ) {
 722                                                 script( $ );
 723                                                 markModuleReady();
 724                                         }
 725                                 } catch ( e ) {
 726                                         // This needs to NOT use mw.log because these errors are common in production mode
 727                                         // and not in debug mode, such as when a symbol that should be global isn't exported
 728                                         if ( window.console && typeof window.console.log === 'function' ) {
 729                                                 console.log( 'mw.loader::execute> Exception thrown by ' + module + ': ' + e.message );
 730                                         }
 731                                         registry[module].state = 'error';
 732                                         throw e;
 733                                 }
 734                         }
 735
 736                         /**
 737                          * Adds a dependencies to the queue with optional callbacks to be run
 738                          * when the dependencies are ready or fail
 739                          *
 740                          * @param dependencies string module name or array of string module names
 741                          * @param ready function callback to execute when all dependencies are ready
 742                          * @param error function callback to execute when any dependency fails
 743                          */
 744                         function request( dependencies, ready, error ) {
 745                                 var regItemDeps, regItemDepLen, n;
 746
 747                                 // Allow calling by single module name
 748                                 if ( typeof dependencies === 'string' ) {
 749                                         dependencies = [dependencies];
 750                                         if ( registry[dependencies[0]] !== undefined ) {
 751                                                 // Cache repetitively accessed deep level object member
 752                                                 regItemDeps = registry[dependencies[0]].dependencies;
 753                                                 // Cache to avoid looped access to length property
 754                                                 regItemDepLen = regItemDeps.length;
 755                                                 for ( n = 0; n < regItemDepLen; n += 1 ) {
 756                                                         dependencies[dependencies.length] = regItemDeps[n];
 757                                                 }
 758                                         }
 759                                 }
 760                                 // Add ready and error callbacks if they were given
 761                                 if ( arguments.length > 1 ) {
 762                                         jobs[jobs.length] = {
 763                                                 'dependencies': filter(
 764                                                         ['registered', 'loading', 'loaded'],
 765                                                         dependencies
 766                                                 ),
 767                                                 'ready': ready,
 768                                                 'error': error
 769                                         };
 770                                 }
 771                                 // Queue up any dependencies that are registered
 772                                 dependencies = filter( ['registered'], dependencies );
 773                                 for ( n = 0; n < dependencies.length; n += 1 ) {
 774                                         if ( $.inArray( dependencies[n], queue ) === -1 ) {
 775                                                 queue[queue.length] = dependencies[n];
 776                                         }
 777                                 }
 778                                 // Work the queue
 779                                 mw.loader.work();
 780                         }
 781
 782                         function sortQuery(o) {
 783                                 var sorted = {}, key, a = [];
 784                                 for ( key in o ) {
 785                                         if ( hasOwn.call( o, key ) ) {
 786                                                 a.push( key );
 787                                         }
 788                                 }
 789                                 a.sort();
 790                                 for ( key = 0; key < a.length; key += 1 ) {
 791                                         sorted[a[key]] = o[a[key]];
 792                                 }
 793                                 return sorted;
 794                         }
 795
 796                         /**
 797                          * Converts a module map of the form { foo: [ 'bar', 'baz' ], bar: [ 'baz, 'quux' ] }
 798                          * to a query string of the form foo.bar,baz|bar.baz,quux
 799                          */
 800                         function buildModulesString( moduleMap ) {
 801                                 var arr = [], p, prefix;
 802                                 for ( prefix in moduleMap ) {
 803                                         p = prefix === '' ? '' : prefix + '.';
 804                                         arr.push( p + moduleMap[prefix].join( ',' ) );
 805                                 }
 806                                 return arr.join( '|' );
 807                         }
 808
 809                         /**
 810                          * Asynchronously append a script tag to the end of the body
 811                          * that invokes load.php
 812                          * @param moduleMap {Object}: Module map, see buildModulesString()
 813                          * @param currReqBase {Object}: Object with other parameters (other than 'modules') to use in the request
 814                          * @param sourceLoadScript {String}: URL of load.php
 815                          */
 816                         function doRequest( moduleMap, currReqBase, sourceLoadScript ) {
 817                                 var request = $.extend(
 818                                         { 'modules': buildModulesString( moduleMap ) },
 819                                         currReqBase
 820                                 );
 821                                 request = sortQuery( request );
 822                                 // Asynchronously append a script tag to the end of the body
 823                                 // Append &* to avoid triggering the IE6 extension check
 824                                 addScript( sourceLoadScript + '?' + $.param( request ) + '&*' );
 825                         }
 826
 827                         /* Public Methods */
 828                         return {
 829                                 /**
 830                                  * Requests dependencies from server, loading and executing when things when ready.
 831                                  */
 832                                 work: function () {
 833                                         var     reqBase, splits, maxQueryLength, q, b, bSource, bGroup, bSourceGroup,
 834                                                 source, group, g, i, modules, maxVersion, sourceLoadScript,
 835                                                 currReqBase, currReqBaseLength, moduleMap, l,
 836                                                 lastDotIndex, prefix, suffix, bytesAdded;
 837
 838                                         // Build a list of request parameters common to all requests.
 839                                         reqBase = {
 840                                                 skin: mw.config.get( 'skin' ),
 841                                                 lang: mw.config.get( 'wgUserLanguage' ),
 842                                                 debug: mw.config.get( 'debug' )
 843                                         };
 844                                         // Split module batch by source and by group.
 845                                         splits = {};
 846                                         maxQueryLength = mw.config.get( 'wgResourceLoaderMaxQueryLength', -1 );
 847
 848                                         // Appends a list of modules from the queue to the batch
 849                                         for ( q = 0; q < queue.length; q += 1 ) {
 850                                                 // Only request modules which are registered
 851                                                 if ( registry[queue[q]] !== undefined && registry[queue[q]].state === 'registered' ) {
 852                                                         // Prevent duplicate entries
 853                                                         if ( $.inArray( queue[q], batch ) === -1 ) {
 854                                                                 batch[batch.length] = queue[q];
 855                                                                 // Mark registered modules as loading
 856                                                                 registry[queue[q]].state = 'loading';
 857                                                         }
 858                                                 }
 859                                         }
 860                                         // Early exit if there's nothing to load...
 861                                         if ( !batch.length ) {
 862                                                 return;
 863                                         }
 864
 865                                         // The queue has been processed into the batch, clear up the queue.
 866                                         queue = [];
 867
 868                                         // Always order modules alphabetically to help reduce cache
 869                                         // misses for otherwise identical content.
 870                                         batch.sort();
 871
 872                                         // Split batch by source and by group.
 873                                         for ( b = 0; b < batch.length; b += 1 ) {
 874                                                 bSource = registry[batch[b]].source;
 875                                                 bGroup = registry[batch[b]].group;
 876                                                 if ( splits[bSource] === undefined ) {
 877                                                         splits[bSource] = {};
 878                                                 }
 879                                                 if ( splits[bSource][bGroup] === undefined ) {
 880                                                         splits[bSource][bGroup] = [];
 881                                                 }
 882                                                 bSourceGroup = splits[bSource][bGroup];
 883                                                 bSourceGroup[bSourceGroup.length] = batch[b];
 884                                         }
 885
 886                                         // Clear the batch - this MUST happen before we append any
 887                                         // script elements to the body or it's possible that a script
 888                                         // will be locally cached, instantly load, and work the batch
 889                                         // again, all before we've cleared it causing each request to
 890                                         // include modules which are already loaded.
 891                                         batch = [];
 892
 893                                         for ( source in splits ) {
 894
 895                                                 sourceLoadScript = sources[source].loadScript;
 896
 897                                                 for ( group in splits[source] ) {
 898
 899                                                         // Cache access to currently selected list of
 900                                                         // modules for this group from this source.
 901                                                         modules = splits[source][group];
 902
 903                                                         // Calculate the highest timestamp
 904                                                         maxVersion = 0;
 905                                                         for ( g = 0; g < modules.length; g += 1 ) {
 906                                                                 if ( registry[modules[g]].version > maxVersion ) {
 907                                                                         maxVersion = registry[modules[g]].version;
 908                                                                 }
 909                                                         }
 910
 911                                                         currReqBase = $.extend( { 'version': formatVersionNumber( maxVersion ) }, reqBase );
 912                                                         currReqBaseLength = $.param( currReqBase ).length;
 913                                                         moduleMap = {};
 914                                                         // We may need to split up the request to honor the query string length limit,
 915                                                         // so build it piece by piece.
 916                                                         l = currReqBaseLength + 9; // '&modules='.length == 9
 917
 918                                                         moduleMap = {}; // { prefix: [ suffixes ] }
 919
 920                                                         for ( i = 0; i < modules.length; i += 1 ) {
 921                                                                 // Determine how many bytes this module would add to the query string
 922                                                                 lastDotIndex = modules[i].lastIndexOf( '.' );
 923                                                                 // Note that these substr() calls work even if lastDotIndex == -1
 924                                                                 prefix = modules[i].substr( 0, lastDotIndex );
 925                                                                 suffix = modules[i].substr( lastDotIndex + 1 );
 926                                                                 bytesAdded = moduleMap[prefix] !== undefined
 927                                                                         ? suffix.length + 3 // '%2C'.length == 3
 928                                                                         : modules[i].length + 3; // '%7C'.length == 3
 929
 930                                                                 // If the request would become too long, create a new one,
 931                                                                 // but don't create empty requests
 932                                                                 if ( maxQueryLength > 0 && !$.isEmptyObject( moduleMap ) && l + bytesAdded > maxQueryLength ) {
 933                                                                         // This request would become too long, create a new one
 934                                                                         // and fire off the old one
 935                                                                         doRequest( moduleMap, currReqBase, sourceLoadScript );
 936                                                                         moduleMap = {};
 937                                                                         l = currReqBaseLength + 9;
 938                                                                 }
 939                                                                 if ( moduleMap[prefix] === undefined ) {
 940                                                                         moduleMap[prefix] = [];
 941                                                                 }
 942                                                                 moduleMap[prefix].push( suffix );
 943                                                                 l += bytesAdded;
 944                                                         }
 945                                                         // If there's anything left in moduleMap, request that too
 946                                                         if ( !$.isEmptyObject( moduleMap ) ) {
 947                                                                 doRequest( moduleMap, currReqBase, sourceLoadScript );
 948                                                         }
 949                                                 }
 950                                         }
 951                                 },
 952
 953                                 /**
 954                                  * Register a source.
 955                                  *
 956                                  * @param id {String}: Short lowercase a-Z string representing a source, only used internally.
 957                                  * @param props {Object}: Object containing only the loadScript property which is a url to
 958                                  * the load.php location of the source.
 959                                  * @return {Boolean}
 960                                  */
 961                                 addSource: function ( id, props ) {
 962                                         var source;
 963                                         // Allow multiple additions
 964                                         if ( typeof id === 'object' ) {
 965                                                 for ( source in id ) {
 966                                                         mw.loader.addSource( source, id[source] );
 967                                                 }
 968                                                 return true;
 969                                         }
 970
 971                                         if ( sources[id] !== undefined ) {
 972                                                 throw new Error( 'source already registered: ' + id );
 973                                         }
 974
 975                                         sources[id] = props;
 976
 977                                         return true;
 978                                 },
 979
 980                                 /**
 981                                  * Registers a module, letting the system know about it and its
 982                                  * properties. Startup modules contain calls to this function.
 983                                  *
 984                                  * @param module {String}: Module name
 985                                  * @param version {Number}: Module version number as a timestamp (falls backs to 0)
 986                                  * @param dependencies {String|Array|Function}: One string or array of strings of module
 987                                  *  names on which this module depends, or a function that returns that array.
 988                                  * @param group {String}: Group which the module is in (optional, defaults to null)
 989                                  * @param source {String}: Name of the source. Defaults to local.
 990                                  */
 991                                 register: function ( module, version, dependencies, group, source ) {
 992                                         var m;
 993                                         // Allow multiple registration
 994                                         if ( typeof module === 'object' ) {
 995                                                 for ( m = 0; m < module.length; m += 1 ) {
 996                                                         // module is an array of module names
 997                                                         if ( typeof module[m] === 'string' ) {
 998                                                                 mw.loader.register( module[m] );
 999                                                         // module is an array of arrays
1000                                                         } else if ( typeof module[m] === 'object' ) {
1001                                                                 mw.loader.register.apply( mw.loader, module[m] );
1002                                                         }
1003                                                 }
1004                                                 return;
1005                                         }
1006                                         // Validate input
1007                                         if ( typeof module !== 'string' ) {
1008                                                 throw new Error( 'module must be a string, not a ' + typeof module );
1009                                         }
1010                                         if ( registry[module] !== undefined ) {
1011                                                 throw new Error( 'module already registered: ' + module );
1012                                         }
1013                                         // List the module as registered
1014                                         registry[module] = {
1015                                                 'version': version !== undefined ? parseInt( version, 10 ) : 0,
1016                                                 'dependencies': [],
1017                                                 'group': typeof group === 'string' ? group : null,
1018                                                 'source': typeof source === 'string' ? source: 'local',
1019                                                 'state': 'registered'
1020                                         };
1021                                         if ( typeof dependencies === 'string' ) {
1022                                                 // Allow dependencies to be given as a single module name
1023                                                 registry[module].dependencies = [dependencies];
1024                                         } else if ( typeof dependencies === 'object' || $.isFunction( dependencies ) ) {
1025                                                 // Allow dependencies to be given as an array of module names
1026                                                 // or a function which returns an array
1027                                                 registry[module].dependencies = dependencies;
1028                                         }
1029                                 },
1030
1031                                 /**
1032                                  * Implements a module, giving the system a course of action to take
1033                                  * upon loading. Results of a request for one or more modules contain
1034                                  * calls to this function.
1035                                  *
1036                                  * All arguments are required.
1037                                  *
1038                                  * @param module String: Name of module
1039                                  * @param script Mixed: Function of module code or String of URL to be used as the src
1040                                  *  attribute when adding a script element to the body
1041                                  * @param style Object: Object of CSS strings keyed by media-type or Object of lists of URLs
1042                                  *  keyed by media-type
1043                                  * @param msgs Object: List of key/value pairs to be passed through mw.messages.set
1044                                  */
1045                                 implement: function ( module, script, style, msgs ) {
1046                                         // Validate input
1047                                         if ( typeof module !== 'string' ) {
1048                                                 throw new Error( 'module must be a string, not a ' + typeof module );
1049                                         }
1050                                         if ( !$.isFunction( script ) && !$.isArray( script ) ) {
1051                                                 throw new Error( 'script must be a function or an array, not a ' + typeof script );
1052                                         }
1053                                         if ( !$.isPlainObject( style ) ) {
1054                                                 throw new Error( 'style must be an object, not a ' + typeof style );
1055                                         }
1056                                         if ( !$.isPlainObject( msgs ) ) {
1057                                                 throw new Error( 'msgs must be an object, not a ' + typeof msgs );
1058                                         }
1059                                         // Automatically register module
1060                                         if ( registry[module] === undefined ) {
1061                                                 mw.loader.register( module );
1062                                         }
1063                                         // Check for duplicate implementation
1064                                         if ( registry[module] !== undefined && registry[module].script !== undefined ) {
1065                                                 throw new Error( 'module already implemented: ' + module );
1066                                         }
1067                                         // Mark module as loaded
1068                                         registry[module].state = 'loaded';
1069                                         // Attach components
1070                                         registry[module].script = script;
1071                                         registry[module].style = style;
1072                                         registry[module].messages = msgs;
1073                                         // Execute or queue callback
1074                                         if ( compare(
1075                                                 filter( ['ready'], registry[module].dependencies ),
1076                                                 registry[module].dependencies ) )
1077                                         {
1078                                                 execute( module );
1079                                         }
1080                                 },
1081
1082                                 /**
1083                                  * Executes a function as soon as one or more required modules are ready
1084                                  *
1085                                  * @param dependencies {String|Array} Module name or array of modules names the callback
1086                                  *  dependends on to be ready before executing
1087                                  * @param ready {Function} callback to execute when all dependencies are ready (optional)
1088                                  * @param error {Function} callback to execute when if dependencies have a errors (optional)
1089                                  */
1090                                 using: function ( dependencies, ready, error ) {
1091                                         var tod = typeof dependencies;
1092                                         // Validate input
1093                                         if ( tod !== 'object' && tod !== 'string' ) {
1094                                                 throw new Error( 'dependencies must be a string or an array, not a ' + tod );
1095                                         }
1096                                         // Allow calling with a single dependency as a string
1097                                         if ( tod === 'string' ) {
1098                                                 dependencies = [dependencies];
1099                                         }
1100                                         // Resolve entire dependency map
1101                                         dependencies = resolve( dependencies );
1102                                         // If all dependencies are met, execute ready immediately
1103                                         if ( compare( filter( ['ready'], dependencies ), dependencies ) ) {
1104                                                 if ( $.isFunction( ready ) ) {
1105                                                         ready();
1106                                                 }
1107                                         }
1108                                         // If any dependencies have errors execute error immediately
1109                                         else if ( filter( ['error'], dependencies ).length ) {
1110                                                 if ( $.isFunction( error ) ) {
1111                                                         error( new Error( 'one or more dependencies have state "error"' ),
1112                                                                 dependencies );
1113                                                 }
1114                                         }
1115                                         // Since some dependencies are not yet ready, queue up a request
1116                                         else {
1117                                                 request( dependencies, ready, error );
1118                                         }
1119                                 },
1120
1121                                 /**
1122                                  * Loads an external script or one or more modules for future use
1123                                  *
1124                                  * @param modules {mixed} Either the name of a module, array of modules,
1125                                  *  or a URL of an external script or style
1126                                  * @param type {String} mime-type to use if calling with a URL of an
1127                                  *  external script or style; acceptable values are "text/css" and
1128                                  *  "text/javascript"; if no type is provided, text/javascript is assumed.
1129                                  */
1130                                 load: function ( modules, type ) {
1131                                         var filtered, m;
1132
1133                                         // Validate input
1134                                         if ( typeof modules !== 'object' && typeof modules !== 'string' ) {
1135                                                 throw new Error( 'modules must be a string or an array, not a ' + typeof modules );
1136                                         }
1137                                         // Allow calling with an external url or single dependency as a string
1138                                         if ( typeof modules === 'string' ) {
1139                                                 // Support adding arbitrary external scripts
1140                                                 if ( /^(https?:)?\/\//.test( modules ) ) {
1141                                                         if ( type === 'text/css' ) {
1142                                                                 $( 'head' ).append( $( '<link>', {
1143                                                                         rel: 'stylesheet',
1144                                                                         type: 'text/css',
1145                                                                         href: modules
1146                                                                 } ) );
1147                                                                 return;
1148                                                         } else if ( type === 'text/javascript' || type === undefined ) {
1149                                                                 addScript( modules );
1150                                                                 return;
1151                                                         }
1152                                                         // Unknown type
1153                                                         throw new Error( 'invalid type for external url, must be text/css or text/javascript. not ' + type );
1154                                                 }
1155                                                 // Called with single module
1156                                                 modules = [modules];
1157                                         }
1158
1159                                         // Filter out undefined modules, otherwise resolve() will throw
1160                                         // an exception for trying to load an undefined module.
1161                                         // Undefined modules are acceptable here in load(), because load() takes
1162                                         // an array of unrelated modules, whereas the modules passed to
1163                                         // using() are related and must all be loaded.
1164                                         for ( filtered = [], m = 0; m < modules.length; m += 1 ) {
1165                                                 if ( registry[modules[m]] !== undefined ) {
1166                                                         filtered[filtered.length] = modules[m];
1167                                                 }
1168                                         }
1169
1170                                         // Resolve entire dependency map
1171                                         filtered = resolve( filtered );
1172                                         // If all modules are ready, nothing dependency be done
1173                                         if ( compare( filter( ['ready'], filtered ), filtered ) ) {
1174                                                 return;
1175                                         }
1176                                         // If any modules have errors
1177                                         else if ( filter( ['error'], filtered ).length ) {
1178                                                 return;
1179                                         }
1180                                         // Since some modules are not yet ready, queue up a request
1181                                         else {
1182                                                 request( filtered );
1183                                                 return;
1184                                         }
1185                                 },
1186
1187                                 /**
1188                                  * Changes the state of a module
1189                                  *
1190                                  * @param module {String|Object} module name or object of module name/state pairs
1191                                  * @param state {String} state name
1192                                  */
1193                                 state: function ( module, state ) {
1194                                         var m;
1195                                         if ( typeof module === 'object' ) {
1196                                                 for ( m in module ) {
1197                                                         mw.loader.state( m, module[m] );
1198                                                 }
1199                                                 return;
1200                                         }
1201                                         if ( registry[module] === undefined ) {
1202                                                 mw.loader.register( module );
1203                                         }
1204                                         registry[module].state = state;
1205                                 },
1206
1207                                 /**
1208                                  * Gets the version of a module
1209                                  *
1210                                  * @param module string name of module to get version for
1211                                  */
1212                                 getVersion: function ( module ) {
1213                                         if ( registry[module] !== undefined && registry[module].version !== undefined ) {
1214                                                 return formatVersionNumber( registry[module].version );
1215                                         }
1216                                         return null;
1217                                 },
1218
1219                                 /**
1220                                  * @deprecated since 1.18 use mw.loader.getVersion() instead
1221                                  */
1222                                 version: function () {
1223                                         return mw.loader.getVersion.apply( mw.loader, arguments );
1224                                 },
1225
1226                                 /**
1227                                  * Gets the state of a module
1228                                  *
1229                                  * @param module string name of module to get state for
1230                                  */
1231                                 getState: function ( module ) {
1232                                         if ( registry[module] !== undefined && registry[module].state !== undefined ) {
1233                                                 return registry[module].state;
1234                                         }
1235                                         return null;
1236                                 },
1237
1238                                 /**
1239                                  * Get names of all registered modules.
1240                                  *
1241                                  * @return {Array}
1242                                  */
1243                                 getModuleNames: function () {
1244                                         return $.map( registry, function ( i, key ) {
1245                                                 return key;
1246                                         } );
1247                                 },
1248
1249                                 /**
1250                                  * Enable or disable blocking. If blocking is enabled and
1251                                  * document ready has not yet occurred, scripts will be loaded
1252                                  * in a blocking way (using document.write) rather than
1253                                  * asynchronously using DOM manipulation
1254                                  *
1255                                  * @param b {Boolean} True to enable blocking, false to disable it
1256                                  */
1257                                 setBlocking: function( b ) {
1258                                         blocking = b;
1259                                 },
1260
1261                                 /**
1262                                  * For backwards-compatibility with Squid-cached pages. Loads mw.user
1263                                  */
1264                                 go: function () {
1265                                         mw.loader.load( 'mediawiki.user' );
1266                                 }
1267                         };
1268                 }() ),
1269
1270                 /** HTML construction helper functions */
1271                 html: ( function () {
1272                         function escapeCallback( s ) {
1273                                 switch ( s ) {
1274                                         case "'":
1275                                                 return '&#039;';
1276                                         case '"':
1277                                                 return '&quot;';
1278                                         case '<':
1279                                                 return '&lt;';
1280                                         case '>':
1281                                                 return '&gt;';
1282                                         case '&':
1283                                                 return '&amp;';
1284                                 }
1285                         }
1286
1287                         return {
1288                                 /**
1289                                  * Escape a string for HTML. Converts special characters to HTML entities.
1290                                  * @param s The string to escape
1291                                  */
1292                                 escape: function ( s ) {
1293                                         return s.replace( /['"<>&]/g, escapeCallback );
1294                                 },
1295
1296                                 /**
1297                                  * Wrapper object for raw HTML passed to mw.html.element().
1298                                  * @constructor
1299                                  */
1300                                 Raw: function ( value ) {
1301                                         this.value = value;
1302                                 },
1303
1304                                 /**
1305                                  * Wrapper object for CDATA element contents passed to mw.html.element()
1306                                  * @constructor
1307                                  */
1308                                 Cdata: function ( value ) {
1309                                         this.value = value;
1310                                 },
1311
1312                                 /**
1313                                  * Create an HTML element string, with safe escaping.
1314                                  *
1315                                  * @param name The tag name.
1316                                  * @param attrs An object with members mapping element names to values
1317                                  * @param contents The contents of the element. May be either:
1318                                  *  - string: The string is escaped.
1319                                  *  - null or undefined: The short closing form is used, e.g. <br/>.
1320                                  *  - this.Raw: The value attribute is included without escaping.
1321                                  *  - this.Cdata: The value attribute is included, and an exception is
1322                                  *   thrown if it contains an illegal ETAGO delimiter.
1323                                  *   See http://www.w3.org/TR/1999/REC-html401-19991224/appendix/notes.html#h-B.3.2
1324                                  *
1325                                  * Example:
1326                                  *      var h = mw.html;
1327                                  *      return h.element( 'div', {},
1328                                  *              new h.Raw( h.element( 'img', {src: '<'} ) ) );
1329                                  * Returns <div><img src="&lt;"/></div>
1330                                  */
1331                                 element: function ( name, attrs, contents ) {
1332                                         var v, attrName, s = '<' + name;
1333
1334                                         for ( attrName in attrs ) {
1335                                                 v = attrs[attrName];
1336                                                 // Convert name=true, to name=name
1337                                                 if ( v === true ) {
1338                                                         v = attrName;
1339                                                 // Skip name=false
1340                                                 } else if ( v === false ) {
1341                                                         continue;
1342                                                 }
1343                                                 s += ' ' + attrName + '="' + this.escape( String( v ) ) + '"';
1344                                         }
1345                                         if ( contents === undefined || contents === null ) {
1346                                                 // Self close tag
1347                                                 s += '/>';
1348                                                 return s;
1349                                         }
1350                                         // Regular open tag
1351                                         s += '>';
1352                                         switch ( typeof contents ) {
1353                                                 case 'string':
1354                                                         // Escaped
1355                                                         s += this.escape( contents );
1356                                                         break;
1357                                                 case 'number':
1358                                                 case 'boolean':
1359                                                         // Convert to string
1360                                                         s += String( contents );
1361                                                         break;
1362                                                 default:
1363                                                         if ( contents instanceof this.Raw ) {
1364                                                                 // Raw HTML inclusion
1365                                                                 s += contents.value;
1366                                                         } else if ( contents instanceof this.Cdata ) {
1367                                                                 // CDATA
1368                                                                 if ( /<\/[a-zA-z]/.test( contents.value ) ) {
1369                                                                         throw new Error( 'mw.html.element: Illegal end tag found in CDATA' );
1370                                                                 }
1371                                                                 s += contents.value;
1372                                                         } else {
1373                                                                 throw new Error( 'mw.html.element: Invalid type of contents' );
1374                                                         }
1375                                         }
1376                                         s += '</' + name + '>';
1377                                         return s;
1378                                 }
1379                         };
1380                 })()
1381         };
1382
1383 })( jQuery );
1384
1385 // Alias $j to jQuery for backwards compatibility
1386 window.$j = jQuery;
1387
1388 // Attach to window and globally alias
1389 window.mw = window.mediaWiki = mw;
1390
1391 // Auto-register from pre-loaded startup scripts
1392 if ( typeof startUp !== 'undefined' && jQuery.isFunction( startUp ) ) {
1393         startUp();
1394         startUp = undefined;
1395 }