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