resources/mediawiki/mediawiki.js

   1 /*jslint browser: true, continue: true, white: true, forin: true*/
   2 /*global jQuery*/
   3 /*
   4  * Core MediaWiki JavaScript Library
   5  */
   6
   7 var mw = ( function ( $, undefined ) {
   8         "use strict";
   9
  10         /* Private Members */
  11
  12         var hasOwn = Object.prototype.hasOwnProperty;
  13         /* Object constructors */
  14
  15         /**
  16          * Map
  17          *
  18          * Creates an object that can be read from or written to from prototype functions
  19          * that allow both single and multiple variables at once.
  20          *
  21          * @param global boolean Whether to store the values in the global window
  22          *  object or a exclusively in the object property 'values'.
  23          * @return Map
  24          */
  25         function Map( global ) {
  26                 this.values = global === true ? window : {};
  27                 return this;
  28         }
  29
  30         Map.prototype = {
  31                 /**
  32                  * Get the value of one or multiple a keys.
  33                  *
  34                  * If called with no arguments, all values will be returned.
  35                  *
  36                  * @param selection mixed String key or array of keys to get values for.
  37                  * @param fallback mixed Value to use in case key(s) do not exist (optional).
  38                  * @return mixed If selection was a string returns the value or null,
  39                  *  If selection was an array, returns an object of key/values (value is null if not found),
  40                  *  If selection was not passed or invalid, will return the 'values' object member (be careful as
  41                  *  objects are always passed by reference in JavaScript!).
  42                  * @return Values as a string or object, null if invalid/inexistant.
  43                  */
  44                 get: function ( selection, fallback ) {
  45                         var results, i;
  46
  47                         if ( $.isArray( selection ) ) {
  48                                 selection = $.makeArray( selection );
  49                                 results = {};
  50                                 for ( i = 0; i < selection.length; i += 1 ) {
  51                                         results[selection[i]] = this.get( selection[i], fallback );
  52                                 }
  53                                 return results;
  54                         }
  55
  56                         if ( typeof selection === 'string' ) {
  57                                 if ( this.values[selection] === undefined ) {
  58                                         if ( fallback !== undefined ) {
  59                                                 return fallback;
  60                                         }
  61                                         return null;
  62                                 }
  63                                 return this.values[selection];
  64                         }
  65
  66                         if ( selection === undefined ) {
  67                                 return this.values;
  68                         }
  69
  70                         // invalid selection key
  71                         return null;
  72                 },
  73
  74                 /**
  75                  * Sets one or multiple key/value pairs.
  76                  *
  77                  * @param selection {mixed} String key or array of keys to set values for.
  78                  * @param value {mixed} Value to set (optional, only in use when key is a string)
  79                  * @return {Boolean} This returns true on success, false on failure.
  80                  */
  81                 set: function ( selection, value ) {
  82                         var s;
  83
  84                         if ( $.isPlainObject( selection ) ) {
  85                                 for ( s in selection ) {
  86                                         this.values[s] = selection[s];
  87                                 }
  88                                 return true;
  89                         }
  90                         if ( typeof selection === 'string' && value !== undefined ) {
  91                                 this.values[selection] = value;
  92                                 return true;
  93                         }
  94                         return false;
  95                 },
  96
  97                 /**
  98                  * Checks if one or multiple keys exist.
  99                  *
 100                  * @param selection {mixed} String key or array of keys to check
 101                  * @return {Boolean} Existence of key(s)
 102                  */
 103                 exists: function ( selection ) {
 104                         var s;
 105
 106                         if ( $.isArray( selection ) ) {
 107                                 for ( s = 0; s < selection.length; s += 1 ) {
 108                                         if ( this.values[selection[s]] === undefined ) {
 109                                                 return false;
 110                                         }
 111                                 }
 112                                 return true;
 113                         }
 114                         return this.values[selection] !== undefined;
 115                 }
 116         };
 117
 118         /**
 119          * Message
 120          *
 121          * Object constructor for messages,
 122          * similar to the Message class in MediaWiki PHP.
 123          *
 124          * @param map Map Instance of mw.Map
 125          * @param key String
 126          * @param parameters Array
 127          * @return Message
 128          */
 129         function Message( map, key, parameters ) {
 130                 this.format = 'plain';
 131                 this.map = map;
 132                 this.key = key;
 133                 this.parameters = parameters === undefined ? [] : $.makeArray( parameters );
 134                 return this;
 135         }
 136
 137         Message.prototype = {
 138                 /**
 139                  * Simple message parser, does $N replacement and nothing else.
 140                  * This may be overridden to provide a more complex message parser.
 141                  *
 142                  * This function will not be called for nonexistent messages.
 143                  */
 144                 parser: function() {
 145                         var parameters = this.parameters;
 146                         return this.map.get( this.key ).replace( /\$(\d+)/g, function ( str, match ) {
 147                                 var index = parseInt( match, 10 ) - 1;
 148                                 return parameters[index] !== undefined ? parameters[index] : '$' + match;
 149                         } );
 150                 },
 151
 152                 /**
 153                  * Appends (does not replace) parameters for replacement to the .parameters property.
 154                  *
 155                  * @param parameters Array
 156                  * @return Message
 157                  */
 158                 params: function ( parameters ) {
 159                         var i;
 160                         for ( i = 0; i < parameters.length; i += 1 ) {
 161                                 this.parameters.push( parameters[i] );
 162                         }
 163                         return this;
 164                 },
 165
 166                 /**
 167                  * Converts message object to it's string form based on the state of format.
 168                  *
 169                  * @return string Message as a string in the current form or <key> if key does not exist.
 170                  */
 171                 toString: function() {
 172                         var text;
 173
 174                         if ( !this.exists() ) {
 175                                 // Use <key> as text if key does not exist
 176                                 if ( this.format !== 'plain' ) {
 177                                         // format 'escape' and 'parse' need to have the brackets and key html escaped
 178                                         return mw.html.escape( '<' + this.key + '>' );
 179                                 }
 180                                 return '<' + this.key + '>';
 181                         }
 182
 183                         if ( this.format === 'plain' ) {
 184                                 // @todo FIXME: Although not applicable to core Message,
 185                                 // Plugins like jQueryMsg should be able to distinguish
 186                                 // between 'plain' (only variable replacement and plural/gender)
 187                                 // and actually parsing wikitext to HTML.
 188                                 text = this.parser();
 189                         }
 190
 191                         if ( this.format === 'escaped' ) {
 192                                 text = this.parser();
 193                                 text = mw.html.escape( text );
 194                         }
 195
 196                         if ( this.format === 'parse' ) {
 197                                 text = this.parser();
 198                         }
 199
 200                         return text;
 201                 },
 202
 203                 /**
 204                  * Changes format to parse and converts message to string
 205                  *
 206                  * @return {string} String form of parsed message
 207                  */
 208                 parse: function() {
 209                         this.format = 'parse';
 210                         return this.toString();
 211                 },
 212
 213                 /**
 214                  * Changes format to plain and converts message to string
 215                  *
 216                  * @return {string} String form of plain message
 217                  */
 218                 plain: function() {
 219                         this.format = 'plain';
 220                         return this.toString();
 221                 },
 222
 223                 /**
 224                  * Changes the format to html escaped and converts message to string
 225                  *
 226                  * @return {string} String form of html escaped message
 227                  */
 228                 escaped: function() {
 229                         this.format = 'escaped';
 230                         return this.toString();
 231                 },
 232
 233                 /**
 234                  * Checks if message exists
 235                  *
 236                  * @return {string} String form of parsed message
 237                  */
 238                 exists: function() {
 239                         return this.map.exists( this.key );
 240                 }
 241         };
 242
 243         return {
 244                 /* Public Members */
 245
 246                 /**
 247                  * Dummy function which in debug mode can be replaced with a function that
 248                  * emulates console.log in console-less environments.
 249                  */
 250                 log: function() { },
 251
 252                 /**
 253                  * @var constructor Make the Map constructor publicly available.
 254                  */
 255                 Map: Map,
 256
 257                 /**
 258                  * @var constructor Make the Message constructor publicly available.
 259                  */
 260                 Message: Message,
 261
 262                 /**
 263                  * List of configuration values
 264                  *
 265                  * Dummy placeholder. Initiated in startUp module as a new instance of mw.Map().
 266                  * If $wgLegacyJavaScriptGlobals is true, this Map will have its values
 267                  * in the global window object.
 268                  */
 269                 config: null,
 270
 271                 /**
 272                  * @var object
 273                  *
 274                  * Empty object that plugins can be installed in.
 275                  */
 276                 libs: {},
 277
 278                 /* Extension points */
 279
 280                 legacy: {},
 281
 282                 /**
 283                  * Localization system
 284                  */
 285                 messages: new Map(),
 286
 287                 /* Public Methods */
 288
 289                 /**
 290                  * Gets a message object, similar to wfMessage()
 291                  *
 292                  * @param key string Key of message to get
 293                  * @param parameter_1 mixed First argument in a list of variadic arguments,
 294                  *  each a parameter for $N replacement in messages.
 295                  * @return Message
 296                  */
 297                 message: function ( key, parameter_1 /* [, parameter_2] */ ) {
 298                         var parameters;
 299                         // Support variadic arguments
 300                         if ( parameter_1 !== undefined ) {
 301                                 parameters = $.makeArray( arguments );
 302                                 parameters.shift();
 303                         } else {
 304                                 parameters = [];
 305                         }
 306                         return new Message( mw.messages, key, parameters );
 307                 },
 308
 309                 /**
 310                  * Gets a message string, similar to wfMsg()
 311                  *
 312                  * @param key string Key of message to get
 313                  * @param parameters mixed First argument in a list of variadic arguments,
 314                  *  each a parameter for $N replacement in messages.
 315                  * @return String.
 316                  */
 317                 msg: function ( /* key, parameter_1, parameter_2, .. */ ) {
 318                         return mw.message.apply( mw.message, arguments ).toString();
 319                 },
 320
 321                 /**
 322                  * Client-side module loader which integrates with the MediaWiki ResourceLoader
 323                  */
 324                 loader: ( function () {
 325
 326                         /* Private Members */
 327
 328                         /**
 329                          * Mapping of registered modules
 330                          *
 331                          * The jquery module is pre-registered, because it must have already
 332                          * been provided for this object to have been built, and in debug mode
 333                          * jquery would have been provided through a unique loader request,
 334                          * making it impossible to hold back registration of jquery until after
 335                          * mediawiki.
 336                          *
 337                          * For exact details on support for script, style and messages, look at
 338                          * mw.loader.implement.
 339                          *
 340                          * Format:
 341                          *      {
 342                          *              'moduleName': {
 343                          *                      'version': ############## (unix timestamp),
 344                          *                      'dependencies': ['required.foo', 'bar.also', ...], (or) function() {}
 345                          *                      'group': 'somegroup', (or) null,
 346                          *                      'source': 'local', 'someforeignwiki', (or) null
 347                          *                      'state': 'registered', 'loading', 'loaded', 'ready', 'error' or 'missing'
 348                          *                      'script': ...,
 349                          *                      'style': ...,
 350                          *                      'messages': { 'key': 'value' },
 351                          *              }
 352                          *      }
 353                          */
 354                         var     registry = {},
 355                                 /**
 356                                  * Mapping of sources, keyed by source-id, values are objects.
 357                                  * Format:
 358                                  *      {
 359                                  *              'sourceId': {
 360                                  *                      'loadScript': 'http://foo.bar/w/load.php'
 361                                  *              }
 362                                  *      }
 363                                  */
 364                                 sources = {},
 365                                 // List of modules which will be loaded as when ready
 366                                 batch = [],
 367                                 // List of modules to be loaded
 368                                 queue = [],
 369                                 // List of callback functions waiting for modules to be ready to be called
 370                                 jobs = [],
 371                                 // Flag indicating that document ready has occured
 372                                 ready = false,
 373                                 // Selector cache for the marker element. Use getMarker() to get/use the marker!
 374                                 $marker = null;
 375
 376                         /* Cache document ready status */
 377
 378                         $(document).ready( function () {
 379                                 ready = true;
 380                         } );
 381
 382                         /* Private methods */
 383
 384                         function getMarker() {
 385                                 // Cached ?
 386                                 if ( $marker ) {
 387                                         return $marker;
 388                                 }
 389
 390                                 $marker = $( 'meta[name="ResourceLoaderDynamicStyles"]' );
 391                                 if ( $marker.length ) {
 392                                         return $marker;
 393                                 }
 394                                 mw.log( 'getMarker> No <meta name="ResourceLoaderDynamicStyles"> found, inserting dynamically.' );
 395                                 $marker = $( '<meta>' ).attr( 'name', 'ResourceLoaderDynamicStyles' ).appendTo( 'head' );
 396
 397                                 return $marker;
 398                         }
 399
 400                         /**
 401                          * Create a new style tag and add it to the DOM.
 402                          *
 403                          * @param text String: CSS text
 404                          * @param $nextnode mixed: [optional] An Element or jQuery object for an element where
 405                          * the style tag should be inserted before. Otherwise appended to the <head>.
 406                          * @return HTMLStyleElement
 407                          */
 408                         function addStyleTag( text, $nextnode ) {
 409                                 var s = document.createElement( 'style' );
 410                                 s.type = 'text/css';
 411                                 s.rel = 'stylesheet';
 412                                 // Insert into document before setting cssText (bug 33305)
 413                                 if ( $nextnode ) {
 414                                         // If a raw element, create a jQuery object, otherwise use directly
 415                                         if ( $nextnode.nodeType ) {
 416                                                 $nextnode = $( $nextnode );
 417                                         }
 418                                         $nextnode.before( s );
 419                                 } else {
 420                                         document.getElementsByTagName('head')[0].appendChild( s );
 421                                 }
 422                                 if ( s.styleSheet ) {
 423                                         s.styleSheet.cssText = text; // IE
 424                                 } else {
 425                                         // Safari sometimes borks on null
 426                                         s.appendChild( document.createTextNode( String( text ) ) );
 427                                 }
 428                                 return s;
 429                         }
 430
 431                         function addInlineCSS( css ) {
 432                                 var $style, style, $newStyle;
 433                                 $style = getMarker().prev();
 434                                 if ( $style.is( 'style' ) && $style.data( 'ResourceLoaderDynamicStyleTag' ) === true ) {
 435                                         // There's already a dynamic <style> tag present, append to it. This recycling of
 436                                         // <style> tags is for bug 31676 (can't have more than 32 <style> tags in IE)
 437                                         style = $style.get( 0 );
 438                                         if ( style.styleSheet ) {
 439                                                 style.styleSheet.cssText += css; // IE
 440                                         } else {
 441                                                 style.appendChild( document.createTextNode( String( css ) ) );
 442                                         }
 443                                 } else {
 444                                         $newStyle = $( addStyleTag( css, getMarker() ) )
 445                                                 .data( 'ResourceLoaderDynamicStyleTag', true );
 446                                 }
 447                         }
 448
 449                         function compare( a, b ) {
 450                                 var i;
 451                                 if ( a.length !== b.length ) {
 452                                         return false;
 453                                 }
 454                                 for ( i = 0; i < b.length; i += 1 ) {
 455                                         if ( $.isArray( a[i] ) ) {
 456                                                 if ( !compare( a[i], b[i] ) ) {
 457                                                         return false;
 458                                                 }
 459                                         }
 460                                         if ( a[i] !== b[i] ) {
 461                                                 return false;
 462                                         }
 463                                 }
 464                                 return true;
 465                         }
 466
 467                         /**
 468                          * Generates an ISO8601 "basic" string from a UNIX timestamp
 469                          */
 470                         function formatVersionNumber( timestamp ) {
 471                                 var     pad = function ( a, b, c ) {
 472                                                 return [a < 10 ? '0' + a : a, b < 10 ? '0' + b : b, c < 10 ? '0' + c : c].join( '' );
 473                                         },
 474                                         d = new Date();
 475                                 d.setTime( timestamp * 1000 );
 476                                 return [
 477                                         pad( d.getUTCFullYear(), d.getUTCMonth() + 1, d.getUTCDate() ), 'T',
 478                                         pad( d.getUTCHours(), d.getUTCMinutes(), d.getUTCSeconds() ), 'Z'
 479                                 ].join( '' );
 480                         }
 481
 482                         /**
 483                          * Recursively resolves dependencies and detects circular references
 484                          */
 485                         function recurse( module, resolved, unresolved ) {
 486                                 var n, deps, len;
 487
 488                                 if ( registry[module] === undefined ) {
 489                                         throw new Error( 'Unknown dependency: ' + module );
 490                                 }
 491                                 // Resolves dynamic loader function and replaces it with its own results
 492                                 if ( $.isFunction( registry[module].dependencies ) ) {
 493                                         registry[module].dependencies = registry[module].dependencies();
 494                                         // Ensures the module's dependencies are always in an array
 495                                         if ( typeof registry[module].dependencies !== 'object' ) {
 496                                                 registry[module].dependencies = [registry[module].dependencies];
 497                                         }
 498                                 }
 499                                 // Tracks down dependencies
 500                                 deps = registry[module].dependencies;
 501                                 len = deps.length;
 502                                 for ( n = 0; n < len; n += 1 ) {
 503                                         if ( $.inArray( deps[n], resolved ) === -1 ) {
 504                                                 if ( $.inArray( deps[n], unresolved ) !== -1 ) {
 505                                                         throw new Error(
 506                                                                 'Circular reference detected: ' + module +
 507                                                                 ' -> ' + deps[n]
 508                                                         );
 509                                                 }
 510
 511                                                 // Add to unresolved
 512                                                 unresolved[unresolved.length] = module;
 513                                                 recurse( deps[n], resolved, unresolved );
 514                                                 // module is at the end of unresolved
 515                                                 unresolved.pop();
 516                                         }
 517                                 }
 518                                 resolved[resolved.length] = module;
 519                         }
 520
 521                         /**
 522                          * Gets a list of module names that a module depends on in their proper dependency order
 523                          *
 524                          * @param module string module name or array of string module names
 525                          * @return list of dependencies, including 'module'.
 526                          * @throws Error if circular reference is detected
 527                          */
 528                         function resolve( module ) {
 529                                 var modules, m, deps, n, resolved;
 530
 531                                 // Allow calling with an array of module names
 532                                 if ( $.isArray( module ) ) {
 533                                         modules = [];
 534                                         for ( m = 0; m < module.length; m += 1 ) {
 535                                                 deps = resolve( module[m] );
 536                                                 for ( n = 0; n < deps.length; n += 1 ) {
 537                                                         modules[modules.length] = deps[n];
 538                                                 }
 539                                         }
 540                                         return modules;
 541                                 }
 542
 543                                 if ( typeof module === 'string' ) {
 544                                         resolved = [];
 545                                         recurse( module, resolved, [] );
 546                                         return resolved;
 547                                 }
 548
 549                                 throw new Error( 'Invalid module argument: ' + module );
 550                         }
 551
 552                         /**
 553                          * Narrows a list of module names down to those matching a specific
 554                          * state (see comment on top of this scope for a list of valid states).
 555                          * One can also filter for 'unregistered', which will return the
 556                          * modules names that don't have a registry entry.
 557                          *
 558                          * @param states string or array of strings of module states to filter by
 559                          * @param modules array list of module names to filter (optional, by default the entire
 560                          * registry is used)
 561                          * @return array list of filtered module names
 562                          */
 563                         function filter( states, modules ) {
 564                                 var list, module, s, m;
 565
 566                                 // Allow states to be given as a string
 567                                 if ( typeof states === 'string' ) {
 568                                         states = [states];
 569                                 }
 570                                 // If called without a list of modules, build and use a list of all modules
 571                                 list = [];
 572                                 if ( modules === undefined ) {
 573                                         modules = [];
 574                                         for ( module in registry ) {
 575                                                 modules[modules.length] = module;
 576                                         }
 577                                 }
 578                                 // Build a list of modules which are in one of the specified states
 579                                 for ( s = 0; s < states.length; s += 1 ) {
 580                                         for ( m = 0; m < modules.length; m += 1 ) {
 581                                                 if ( registry[modules[m]] === undefined ) {
 582                                                         // Module does not exist
 583                                                         if ( states[s] === 'unregistered' ) {
 584                                                                 // OK, undefined
 585                                                                 list[list.length] = modules[m];
 586                                                         }
 587                                                 } else {
 588                                                         // Module exists, check state
 589                                                         if ( registry[modules[m]].state === states[s] ) {
 590                                                                 // OK, correct state
 591                                                                 list[list.length] = modules[m];
 592                                                         }
 593                                                 }
 594                                         }
 595                                 }
 596                                 return list;
 597                         }
 598
 599                         /**
 600                          * Automatically executes jobs and modules which are pending with satistifed dependencies.
 601                          *
 602                          * This is used when dependencies are satisfied, such as when a module is executed.
 603                          */
 604                         function handlePending( module ) {
 605                                 var j, r;
 606
 607                                 try {
 608                                         // Run jobs whose dependencies have just been met
 609                                         for ( j = 0; j < jobs.length; j += 1 ) {
 610                                                 if ( compare(
 611                                                         filter( 'ready', jobs[j].dependencies ),
 612                                                         jobs[j].dependencies ) )
 613                                                 {
 614                                                         var callback = jobs[j].ready;
 615                                                         jobs.splice( j, 1 );
 616                                                         j -= 1;
 617                                                         if ( $.isFunction( callback ) ) {
 618                                                                 callback();
 619                                                         }
 620                                                 }
 621                                         }
 622                                         // Execute modules whose dependencies have just been met
 623                                         for ( r in registry ) {
 624                                                 if ( registry[r].state === 'loaded' ) {
 625                                                         if ( compare(
 626                                                                 filter( ['ready'], registry[r].dependencies ),
 627                                                                 registry[r].dependencies ) )
 628                                                         {
 629                                                                 execute( r );
 630                                                         }
 631                                                 }
 632                                         }
 633                                 } catch ( e ) {
 634                                         // Run error callbacks of jobs affected by this condition
 635                                         for ( j = 0; j < jobs.length; j += 1 ) {
 636                                                 if ( $.inArray( module, jobs[j].dependencies ) !== -1 ) {
 637                                                         if ( $.isFunction( jobs[j].error ) ) {
 638                                                                 jobs[j].error( e, module );
 639                                                         }
 640                                                         jobs.splice( j, 1 );
 641                                                         j -= 1;
 642                                                 }
 643                                         }
 644                                         throw e;
 645                                 }
 646                         }
 647
 648                         /**
 649                          * Adds a script tag to the DOM, either using document.write or low-level DOM manipulation,
 650                          * depending on whether document-ready has occured yet and whether we are in async mode.
 651                          *
 652                          * @param src String: URL to script, will be used as the src attribute in the script tag
 653                          * @param callback Function: Optional callback which will be run when the script is done
 654                          */
 655                         function addScript( src, callback, async ) {
 656                                 var done = false, script, head;
 657                                 if ( ready || async ) {
 658                                         // jQuery's getScript method is NOT better than doing this the old-fashioned way
 659                                         // because jQuery will eval the script's code, and errors will not have sane
 660                                         // line numbers.
 661                                         script = document.createElement( 'script' );
 662                                         script.setAttribute( 'src', src );
 663                                         script.setAttribute( 'type', 'text/javascript' );
 664                                         if ( $.isFunction( callback ) ) {
 665                                                 // Attach handlers for all browsers (based on jQuery.ajax)
 666                                                 script.onload = script.onreadystatechange = function() {
 667
 668                                                         if (
 669                                                                 !done
 670                                                                 && (
 671                                                                         !script.readyState
 672                                                                         || /loaded|complete/.test( script.readyState )
 673                                                                 )
 674                                                         ) {
 675
 676                                                                 done = true;
 677
 678                                                                 callback();
 679
 680                                                                 // Handle memory leak in IE. This seems to fail in
 681                                                                 // IE7 sometimes (Permission Denied error when
 682                                                                 // accessing script.parentNode) so wrap it in
 683                                                                 // a try catch.
 684                                                                 try {
 685                                                                         script.onload = script.onreadystatechange = null;
 686                                                                         if ( script.parentNode ) {
 687                                                                                 script.parentNode.removeChild( script );
 688                                                                         }
 689
 690                                                                         // Dereference the script
 691                                                                         script = undefined;
 692                                                                 } catch ( e ) { }
 693                                                         }
 694                                                 };
 695                                         }
 696
 697                                         if ( window.opera ) {
 698                                                 // Appending to the <head> blocks rendering completely in Opera,
 699                                                 // so append to the <body> after document ready. This means the
 700                                                 // scripts only start loading after  the document has been rendered,
 701                                                 // but so be it. Opera users don't deserve faster web pages if their
 702                                                 // browser makes it impossible
 703                                                 $( function() { document.body.appendChild( script ); } );
 704                                         } else {
 705                                                 // IE-safe way of getting the <head> . document.documentElement.head doesn't
 706                                                 // work in scripts that run in the <head>
 707                                                 head = document.getElementsByTagName( 'head' )[0];
 708                                                 ( document.body || head ).appendChild( script );
 709                                         }
 710                                 } else {
 711                                         document.write( mw.html.element(
 712                                                 'script', { 'type': 'text/javascript', 'src': src }, ''
 713                                         ) );
 714                                         if ( $.isFunction( callback ) ) {
 715                                                 // Document.write is synchronous, so this is called when it's done
 716                                                 // FIXME: that's a lie. doc.write isn't actually synchronous
 717                                                 callback();
 718                                         }
 719                                 }
 720                         }
 721
 722                         /**
 723                          * Executes a loaded module, making it ready to use
 724                          *
 725                          * @param module string module name to execute
 726                          */
 727                         function execute( module, callback ) {
 728                                 var style, media, i, script, markModuleReady, nestedAddScript;
 729
 730                                 if ( registry[module] === undefined ) {
 731                                         throw new Error( 'Module has not been registered yet: ' + module );
 732                                 } else if ( registry[module].state === 'registered' ) {
 733                                         throw new Error( 'Module has not been requested from the server yet: ' + module );
 734                                 } else if ( registry[module].state === 'loading' ) {
 735                                         throw new Error( 'Module has not completed loading yet: ' + module );
 736                                 } else if ( registry[module].state === 'ready' ) {
 737                                         throw new Error( 'Module has already been loaded: ' + module );
 738                                 }
 739
 740                                 // Add styles
 741                                 if ( $.isPlainObject( registry[module].style ) ) {
 742                                         // 'media' type ignored, see documentation of mw.loader.implement
 743                                         for ( media in registry[module].style ) {
 744                                                 style = registry[module].style[media];
 745                                                 if ( $.isArray( style ) ) {
 746                                                         for ( i = 0; i < style.length; i += 1 ) {
 747                                                                 getMarker().before( mw.html.element( 'link', {
 748                                                                         'type': 'text/css',
 749                                                                         'rel': 'stylesheet',
 750                                                                         'href': style[i]
 751                                                                 } ) );
 752                                                         }
 753                                                 } else if ( typeof style === 'string' ) {
 754                                                         addInlineCSS( style );
 755                                                 }
 756                                         }
 757                                 }
 758                                 // Add localizations to message system
 759                                 if ( $.isPlainObject( registry[module].messages ) ) {
 760                                         mw.messages.set( registry[module].messages );
 761                                 }
 762                                 // Execute script
 763                                 try {
 764                                         script = registry[module].script;
 765                                         markModuleReady = function() {
 766                                                 registry[module].state = 'ready';
 767                                                 handlePending( module );
 768                                                 if ( $.isFunction( callback ) ) {
 769                                                         callback();
 770                                                 }
 771                                         };
 772                                         nestedAddScript = function ( arr, callback, async, i ) {
 773                                                 // Recursively call addScript() in its own callback
 774                                                 // for each element of arr.
 775                                                 if ( i >= arr.length ) {
 776                                                         // We're at the end of the array
 777                                                         callback();
 778                                                         return;
 779                                                 }
 780
 781                                                 addScript( arr[i], function() {
 782                                                         nestedAddScript( arr, callback, async, i + 1 );
 783                                                 }, async );
 784                                         };
 785
 786                                         if ( $.isArray( script ) ) {
 787                                                 registry[module].state = 'loading';
 788                                                 nestedAddScript( script, markModuleReady, registry[module].async, 0 );
 789                                         } else if ( $.isFunction( script ) ) {
 790                                                 script();
 791                                                 markModuleReady();
 792                                         }
 793                                 } catch ( e ) {
 794                                         // This needs to NOT use mw.log because these errors are common in production mode
 795                                         // and not in debug mode, such as when a symbol that should be global isn't exported
 796                                         if ( window.console && typeof window.console.log === 'function' ) {
 797                                                 console.log( 'mw.loader::execute> Exception thrown by ' + module + ': ' + e.message );
 798                                                 console.log( e );
 799                                         }
 800                                         registry[module].state = 'error';
 801                                 }
 802                         }
 803
 804                         /**
 805                          * Adds a dependencies to the queue with optional callbacks to be run
 806                          * when the dependencies are ready or fail
 807                          *
 808                          * @param dependencies string module name or array of string module names
 809                          * @param ready function callback to execute when all dependencies are ready
 810                          * @param error function callback to execute when any dependency fails
 811                          * @param async (optional) If true, load modules asynchronously even if
 812                          *  document ready has not yet occurred
 813                          */
 814                         function request( dependencies, ready, error, async ) {
 815                                 var regItemDeps, regItemDepLen, n;
 816
 817                                 // Allow calling by single module name
 818                                 if ( typeof dependencies === 'string' ) {
 819                                         dependencies = [dependencies];
 820                                         if ( registry[dependencies[0]] !== undefined ) {
 821                                                 // Cache repetitively accessed deep level object member
 822                                                 regItemDeps = registry[dependencies[0]].dependencies;
 823                                                 // Cache to avoid looped access to length property
 824                                                 regItemDepLen = regItemDeps.length;
 825                                                 for ( n = 0; n < regItemDepLen; n += 1 ) {
 826                                                         dependencies[dependencies.length] = regItemDeps[n];
 827                                                 }
 828                                         }
 829                                 }
 830
 831                                 // Add ready and error callbacks if they were given
 832                                 if ( ready !== undefined || error !== undefined ) {
 833                                         jobs[jobs.length] = {
 834                                                 'dependencies': filter(
 835                                                         ['registered', 'loading', 'loaded'],
 836                                                         dependencies
 837                                                 ),
 838                                                 'ready': ready,
 839                                                 'error': error
 840                                         };
 841                                 }
 842
 843                                 // Queue up any dependencies that are registered
 844                                 dependencies = filter( ['registered'], dependencies );
 845                                 for ( n = 0; n < dependencies.length; n += 1 ) {
 846                                         if ( $.inArray( dependencies[n], queue ) === -1 ) {
 847                                                 queue[queue.length] = dependencies[n];
 848                                                 if ( async ) {
 849                                                         // Mark this module as async in the registry
 850                                                         registry[dependencies[n]].async = true;
 851                                                 }
 852                                         }
 853                                 }
 854
 855                                 // Work the queue
 856                                 mw.loader.work();
 857                         }
 858
 859                         function sortQuery(o) {
 860                                 var sorted = {}, key, a = [];
 861                                 for ( key in o ) {
 862                                         if ( hasOwn.call( o, key ) ) {
 863                                                 a.push( key );
 864                                         }
 865                                 }
 866                                 a.sort();
 867                                 for ( key = 0; key < a.length; key += 1 ) {
 868                                         sorted[a[key]] = o[a[key]];
 869                                 }
 870                                 return sorted;
 871                         }
 872
 873                         /**
 874                          * Converts a module map of the form { foo: [ 'bar', 'baz' ], bar: [ 'baz, 'quux' ] }
 875                          * to a query string of the form foo.bar,baz|bar.baz,quux
 876                          */
 877                         function buildModulesString( moduleMap ) {
 878                                 var arr = [], p, prefix;
 879                                 for ( prefix in moduleMap ) {
 880                                         p = prefix === '' ? '' : prefix + '.';
 881                                         arr.push( p + moduleMap[prefix].join( ',' ) );
 882                                 }
 883                                 return arr.join( '|' );
 884                         }
 885
 886                         /**
 887                          * Asynchronously append a script tag to the end of the body
 888                          * that invokes load.php
 889                          * @param moduleMap {Object}: Module map, see buildModulesString()
 890                          * @param currReqBase {Object}: Object with other parameters (other than 'modules') to use in the request
 891                          * @param sourceLoadScript {String}: URL of load.php
 892                          * @param async {Boolean}: If true, use an asynchrounous request even if document ready has not yet occurred
 893                          */
 894                         function doRequest( moduleMap, currReqBase, sourceLoadScript, async ) {
 895                                 var request = $.extend(
 896                                         { 'modules': buildModulesString( moduleMap ) },
 897                                         currReqBase
 898                                 );
 899                                 request = sortQuery( request );
 900                                 // Asynchronously append a script tag to the end of the body
 901                                 // Append &* to avoid triggering the IE6 extension check
 902                                 addScript( sourceLoadScript + '?' + $.param( request ) + '&*', null, async );
 903                         }
 904
 905                         /* Public Methods */
 906                         return {
 907                                 addStyleTag: addStyleTag,
 908
 909                                 /**
 910                                  * Requests dependencies from server, loading and executing when things when ready.
 911                                  */
 912                                 work: function () {
 913                                         var     reqBase, splits, maxQueryLength, q, b, bSource, bGroup, bSourceGroup,
 914                                                 source, group, g, i, modules, maxVersion, sourceLoadScript,
 915                                                 currReqBase, currReqBaseLength, moduleMap, l,
 916                                                 lastDotIndex, prefix, suffix, bytesAdded, async;
 917
 918                                         // Build a list of request parameters common to all requests.
 919                                         reqBase = {
 920                                                 skin: mw.config.get( 'skin' ),
 921                                                 lang: mw.config.get( 'wgUserLanguage' ),
 922                                                 debug: mw.config.get( 'debug' )
 923                                         };
 924                                         // Split module batch by source and by group.
 925                                         splits = {};
 926                                         maxQueryLength = mw.config.get( 'wgResourceLoaderMaxQueryLength', -1 );
 927
 928                                         // Appends a list of modules from the queue to the batch
 929                                         for ( q = 0; q < queue.length; q += 1 ) {
 930                                                 // Only request modules which are registered
 931                                                 if ( registry[queue[q]] !== undefined && registry[queue[q]].state === 'registered' ) {
 932                                                         // Prevent duplicate entries
 933                                                         if ( $.inArray( queue[q], batch ) === -1 ) {
 934                                                                 batch[batch.length] = queue[q];
 935                                                                 // Mark registered modules as loading
 936                                                                 registry[queue[q]].state = 'loading';
 937                                                         }
 938                                                 }
 939                                         }
 940                                         // Early exit if there's nothing to load...
 941                                         if ( !batch.length ) {
 942                                                 return;
 943                                         }
 944
 945                                         // The queue has been processed into the batch, clear up the queue.
 946                                         queue = [];
 947
 948                                         // Always order modules alphabetically to help reduce cache
 949                                         // misses for otherwise identical content.
 950                                         batch.sort();
 951
 952                                         // Split batch by source and by group.
 953                                         for ( b = 0; b < batch.length; b += 1 ) {
 954                                                 bSource = registry[batch[b]].source;
 955                                                 bGroup = registry[batch[b]].group;
 956                                                 if ( splits[bSource] === undefined ) {
 957                                                         splits[bSource] = {};
 958                                                 }
 959                                                 if ( splits[bSource][bGroup] === undefined ) {
 960                                                         splits[bSource][bGroup] = [];
 961                                                 }
 962                                                 bSourceGroup = splits[bSource][bGroup];
 963                                                 bSourceGroup[bSourceGroup.length] = batch[b];
 964                                         }
 965
 966                                         // Clear the batch - this MUST happen before we append any
 967                                         // script elements to the body or it's possible that a script
 968                                         // will be locally cached, instantly load, and work the batch
 969                                         // again, all before we've cleared it causing each request to
 970                                         // include modules which are already loaded.
 971                                         batch = [];
 972
 973                                         for ( source in splits ) {
 974
 975                                                 sourceLoadScript = sources[source].loadScript;
 976
 977                                                 for ( group in splits[source] ) {
 978
 979                                                         // Cache access to currently selected list of
 980                                                         // modules for this group from this source.
 981                                                         modules = splits[source][group];
 982
 983                                                         // Calculate the highest timestamp
 984                                                         maxVersion = 0;
 985                                                         for ( g = 0; g < modules.length; g += 1 ) {
 986                                                                 if ( registry[modules[g]].version > maxVersion ) {
 987                                                                         maxVersion = registry[modules[g]].version;
 988                                                                 }
 989                                                         }
 990
 991                                                         currReqBase = $.extend( { 'version': formatVersionNumber( maxVersion ) }, reqBase );
 992                                                         currReqBaseLength = $.param( currReqBase ).length;
 993                                                         async = true;
 994                                                         // We may need to split up the request to honor the query string length limit,
 995                                                         // so build it piece by piece.
 996                                                         l = currReqBaseLength + 9; // '&modules='.length == 9
 997
 998                                                         moduleMap = {}; // { prefix: [ suffixes ] }
 999
1000                                                         for ( i = 0; i < modules.length; i += 1 ) {
1001                                                                 // Determine how many bytes this module would add to the query string
1002                                                                 lastDotIndex = modules[i].lastIndexOf( '.' );
1003                                                                 // Note that these substr() calls work even if lastDotIndex == -1
1004                                                                 prefix = modules[i].substr( 0, lastDotIndex );
1005                                                                 suffix = modules[i].substr( lastDotIndex + 1 );
1006                                                                 bytesAdded = moduleMap[prefix] !== undefined
1007                                                                         ? suffix.length + 3 // '%2C'.length == 3
1008                                                                         : modules[i].length + 3; // '%7C'.length == 3
1009
1010                                                                 // If the request would become too long, create a new one,
1011                                                                 // but don't create empty requests
1012                                                                 if ( maxQueryLength > 0 && !$.isEmptyObject( moduleMap ) && l + bytesAdded > maxQueryLength ) {
1013                                                                         // This request would become too long, create a new one
1014                                                                         // and fire off the old one
1015                                                                         doRequest( moduleMap, currReqBase, sourceLoadScript, async );
1016                                                                         moduleMap = {};
1017                                                                         async = true;
1018                                                                         l = currReqBaseLength + 9;
1019                                                                 }
1020                                                                 if ( moduleMap[prefix] === undefined ) {
1021                                                                         moduleMap[prefix] = [];
1022                                                                 }
1023                                                                 moduleMap[prefix].push( suffix );
1024                                                                 if ( !registry[modules[i]].async ) {
1025                                                                         // If this module is blocking, make the entire request blocking
1026                                                                         // This is slightly suboptimal, but in practice mixing of blocking
1027                                                                         // and async modules will only occur in debug mode.
1028                                                                         async = false;
1029                                                                 }
1030                                                                 l += bytesAdded;
1031                                                         }
1032                                                         // If there's anything left in moduleMap, request that too
1033                                                         if ( !$.isEmptyObject( moduleMap ) ) {
1034                                                                 doRequest( moduleMap, currReqBase, sourceLoadScript, async );
1035                                                         }
1036                                                 }
1037                                         }
1038                                 },
1039
1040                                 /**
1041                                  * Register a source.
1042                                  *
1043                                  * @param id {String}: Short lowercase a-Z string representing a source, only used internally.
1044                                  * @param props {Object}: Object containing only the loadScript property which is a url to
1045                                  * the load.php location of the source.
1046                                  * @return {Boolean}
1047                                  */
1048                                 addSource: function ( id, props ) {
1049                                         var source;
1050                                         // Allow multiple additions
1051                                         if ( typeof id === 'object' ) {
1052                                                 for ( source in id ) {
1053                                                         mw.loader.addSource( source, id[source] );
1054                                                 }
1055                                                 return true;
1056                                         }
1057
1058                                         if ( sources[id] !== undefined ) {
1059                                                 throw new Error( 'source already registered: ' + id );
1060                                         }
1061
1062                                         sources[id] = props;
1063
1064                                         return true;
1065                                 },
1066
1067                                 /**
1068                                  * Registers a module, letting the system know about it and its
1069                                  * properties. Startup modules contain calls to this function.
1070                                  *
1071                                  * @param module {String}: Module name
1072                                  * @param version {Number}: Module version number as a timestamp (falls backs to 0)
1073                                  * @param dependencies {String|Array|Function}: One string or array of strings of module
1074                                  *  names on which this module depends, or a function that returns that array.
1075                                  * @param group {String}: Group which the module is in (optional, defaults to null)
1076                                  * @param source {String}: Name of the source. Defaults to local.
1077                                  */
1078                                 register: function ( module, version, dependencies, group, source ) {
1079                                         var m;
1080                                         // Allow multiple registration
1081                                         if ( typeof module === 'object' ) {
1082                                                 for ( m = 0; m < module.length; m += 1 ) {
1083                                                         // module is an array of module names
1084                                                         if ( typeof module[m] === 'string' ) {
1085                                                                 mw.loader.register( module[m] );
1086                                                         // module is an array of arrays
1087                                                         } else if ( typeof module[m] === 'object' ) {
1088                                                                 mw.loader.register.apply( mw.loader, module[m] );
1089                                                         }
1090                                                 }
1091                                                 return;
1092                                         }
1093                                         // Validate input
1094                                         if ( typeof module !== 'string' ) {
1095                                                 throw new Error( 'module must be a string, not a ' + typeof module );
1096                                         }
1097                                         if ( registry[module] !== undefined ) {
1098                                                 throw new Error( 'module already registered: ' + module );
1099                                         }
1100                                         // List the module as registered
1101                                         registry[module] = {
1102                                                 'version': version !== undefined ? parseInt( version, 10 ) : 0,
1103                                                 'dependencies': [],
1104                                                 'group': typeof group === 'string' ? group : null,
1105                                                 'source': typeof source === 'string' ? source: 'local',
1106                                                 'state': 'registered'
1107                                         };
1108                                         if ( typeof dependencies === 'string' ) {
1109                                                 // Allow dependencies to be given as a single module name
1110                                                 registry[module].dependencies = [dependencies];
1111                                         } else if ( typeof dependencies === 'object' || $.isFunction( dependencies ) ) {
1112                                                 // Allow dependencies to be given as an array of module names
1113                                                 // or a function which returns an array
1114                                                 registry[module].dependencies = dependencies;
1115                                         }
1116                                 },
1117
1118                                 /**
1119                                  * Implements a module, giving the system a course of action to take
1120                                  * upon loading. Results of a request for one or more modules contain
1121                                  * calls to this function.
1122                                  *
1123                                  * All arguments are required.
1124                                  *
1125                                  * @param module String: Name of module
1126                                  * @param script Mixed: Function of module code or String of URL to be used as the src
1127                                  *  attribute when adding a script element to the body
1128                                  * @param style Object: Object of CSS strings keyed by media-type or Object of lists of URLs
1129                                  *  keyed by media-type. Media-type should be "all" or "", actual types are not supported
1130                                  *  right now due to the way execute() processes the stylesheets (they are concatenated
1131                                  *  into a single <style> tag). In the past these weren't concatenated together (which is
1132                                  *  these are keyed by media-type),  but bug 31676 forces us to. In practice this is not a
1133                                  *  problem because ResourceLoader only generates stylesheets for media-type all (e.g. print
1134                                  *  stylesheets are wrapped in @media print {} and concatenated with the others).
1135                                  * @param msgs Object: List of key/value pairs to be passed through mw.messages.set
1136                                  */
1137                                 implement: function ( module, script, style, msgs ) {
1138                                         // Validate input
1139                                         if ( typeof module !== 'string' ) {
1140                                                 throw new Error( 'module must be a string, not a ' + typeof module );
1141                                         }
1142                                         if ( !$.isFunction( script ) && !$.isArray( script ) ) {
1143                                                 throw new Error( 'script must be a function or an array, not a ' + typeof script );
1144                                         }
1145                                         if ( !$.isPlainObject( style ) ) {
1146                                                 throw new Error( 'style must be an object, not a ' + typeof style );
1147                                         }
1148                                         if ( !$.isPlainObject( msgs ) ) {
1149                                                 throw new Error( 'msgs must be an object, not a ' + typeof msgs );
1150                                         }
1151                                         // Automatically register module
1152                                         if ( registry[module] === undefined ) {
1153                                                 mw.loader.register( module );
1154                                         }
1155                                         // Check for duplicate implementation
1156                                         if ( registry[module] !== undefined && registry[module].script !== undefined ) {
1157                                                 throw new Error( 'module already implemented: ' + module );
1158                                         }
1159                                         // Mark module as loaded
1160                                         registry[module].state = 'loaded';
1161                                         // Attach components
1162                                         registry[module].script = script;
1163                                         registry[module].style = style;
1164                                         registry[module].messages = msgs;
1165                                         // Execute or queue callback
1166                                         if ( compare(
1167                                                 filter( ['ready'], registry[module].dependencies ),
1168                                                 registry[module].dependencies ) )
1169                                         {
1170                                                 execute( module );
1171                                         }
1172                                 },
1173
1174                                 /**
1175                                  * Executes a function as soon as one or more required modules are ready
1176                                  *
1177                                  * @param dependencies {String|Array} Module name or array of modules names the callback
1178                                  *  dependends on to be ready before executing
1179                                  * @param ready {Function} callback to execute when all dependencies are ready (optional)
1180                                  * @param error {Function} callback to execute when if dependencies have a errors (optional)
1181                                  */
1182                                 using: function ( dependencies, ready, error ) {
1183                                         var tod = typeof dependencies;
1184                                         // Validate input
1185                                         if ( tod !== 'object' && tod !== 'string' ) {
1186                                                 throw new Error( 'dependencies must be a string or an array, not a ' + tod );
1187                                         }
1188                                         // Allow calling with a single dependency as a string
1189                                         if ( tod === 'string' ) {
1190                                                 dependencies = [dependencies];
1191                                         }
1192                                         // Resolve entire dependency map
1193                                         dependencies = resolve( dependencies );
1194                                         // If all dependencies are met, execute ready immediately
1195                                         if ( compare( filter( ['ready'], dependencies ), dependencies ) ) {
1196                                                 if ( $.isFunction( ready ) ) {
1197                                                         ready();
1198                                                 }
1199                                         }
1200                                         // If any dependencies have errors execute error immediately
1201                                         else if ( filter( ['error'], dependencies ).length ) {
1202                                                 if ( $.isFunction( error ) ) {
1203                                                         error( new Error( 'one or more dependencies have state "error"' ),
1204                                                                 dependencies );
1205                                                 }
1206                                         }
1207                                         // Since some dependencies are not yet ready, queue up a request
1208                                         else {
1209                                                 request( dependencies, ready, error );
1210                                         }
1211                                 },
1212
1213                                 /**
1214                                  * Loads an external script or one or more modules for future use
1215                                  *
1216                                  * @param modules {mixed} Either the name of a module, array of modules,
1217                                  *  or a URL of an external script or style
1218                                  * @param type {String} mime-type to use if calling with a URL of an
1219                                  *  external script or style; acceptable values are "text/css" and
1220                                  *  "text/javascript"; if no type is provided, text/javascript is assumed.
1221                                  * @param async {Boolean} (optional) If true, load modules asynchronously
1222                                  *  even if document ready has not yet occurred. If false (default),
1223                                  *  block before document ready and load async after. If not set, true will
1224                                  *  be assumed if loading a URL, and false will be assumed otherwise.
1225                                  */
1226                                 load: function ( modules, type, async ) {
1227                                         var filtered, m;
1228
1229                                         // Validate input
1230                                         if ( typeof modules !== 'object' && typeof modules !== 'string' ) {
1231                                                 throw new Error( 'modules must be a string or an array, not a ' + typeof modules );
1232                                         }
1233                                         // Allow calling with an external url or single dependency as a string
1234                                         if ( typeof modules === 'string' ) {
1235                                                 // Support adding arbitrary external scripts
1236                                                 if ( /^(https?:)?\/\//.test( modules ) ) {
1237                                                         if ( async === undefined ) {
1238                                                                 // Assume async for bug 34542
1239                                                                 async = true;
1240                                                         }
1241                                                         if ( type === 'text/css' ) {
1242                                                                 $( 'head' ).append( $( '<link>', {
1243                                                                         rel: 'stylesheet',
1244                                                                         type: 'text/css',
1245                                                                         href: modules
1246                                                                 } ) );
1247                                                                 return;
1248                                                         }
1249                                                         if ( type === 'text/javascript' || type === undefined ) {
1250                                                                 addScript( modules, null, async );
1251                                                                 return;
1252                                                         }
1253                                                         // Unknown type
1254                                                         throw new Error( 'invalid type for external url, must be text/css or text/javascript. not ' + type );
1255                                                 }
1256                                                 // Called with single module
1257                                                 modules = [modules];
1258                                         }
1259
1260                                         // Filter out undefined modules, otherwise resolve() will throw
1261                                         // an exception for trying to load an undefined module.
1262                                         // Undefined modules are acceptable here in load(), because load() takes
1263                                         // an array of unrelated modules, whereas the modules passed to
1264                                         // using() are related and must all be loaded.
1265                                         for ( filtered = [], m = 0; m < modules.length; m += 1 ) {
1266                                                 if ( registry[modules[m]] !== undefined ) {
1267                                                         filtered[filtered.length] = modules[m];
1268                                                 }
1269                                         }
1270
1271                                         // Resolve entire dependency map
1272                                         filtered = resolve( filtered );
1273                                         // If all modules are ready, nothing dependency be done
1274                                         if ( compare( filter( ['ready'], filtered ), filtered ) ) {
1275                                                 return;
1276                                         }
1277                                         // If any modules have errors
1278                                         if ( filter( ['error'], filtered ).length ) {
1279                                                 return;
1280                                         }
1281                                         // Since some modules are not yet ready, queue up a request
1282                                         request( filtered, null, null, async );
1283                                         return;
1284                                 },
1285
1286                                 /**
1287                                  * Changes the state of a module
1288                                  *
1289                                  * @param module {String|Object} module name or object of module name/state pairs
1290                                  * @param state {String} state name
1291                                  */
1292                                 state: function ( module, state ) {
1293                                         var m;
1294                                         if ( typeof module === 'object' ) {
1295                                                 for ( m in module ) {
1296                                                         mw.loader.state( m, module[m] );
1297                                                 }
1298                                                 return;
1299                                         }
1300                                         if ( registry[module] === undefined ) {
1301                                                 mw.loader.register( module );
1302                                         }
1303                                         registry[module].state = state;
1304                                 },
1305
1306                                 /**
1307                                  * Gets the version of a module
1308                                  *
1309                                  * @param module string name of module to get version for
1310                                  */
1311                                 getVersion: function ( module ) {
1312                                         if ( registry[module] !== undefined && registry[module].version !== undefined ) {
1313                                                 return formatVersionNumber( registry[module].version );
1314                                         }
1315                                         return null;
1316                                 },
1317
1318                                 /**
1319                                  * @deprecated since 1.18 use mw.loader.getVersion() instead
1320                                  */
1321                                 version: function () {
1322                                         return mw.loader.getVersion.apply( mw.loader, arguments );
1323                                 },
1324
1325                                 /**
1326                                  * Gets the state of a module
1327                                  *
1328                                  * @param module string name of module to get state for
1329                                  */
1330                                 getState: function ( module ) {
1331                                         if ( registry[module] !== undefined && registry[module].state !== undefined ) {
1332                                                 return registry[module].state;
1333                                         }
1334                                         return null;
1335                                 },
1336
1337                                 /**
1338                                  * Get names of all registered modules.
1339                                  *
1340                                  * @return {Array}
1341                                  */
1342                                 getModuleNames: function () {
1343                                         return $.map( registry, function ( i, key ) {
1344                                                 return key;
1345                                         } );
1346                                 },
1347
1348                                 /**
1349                                  * For backwards-compatibility with Squid-cached pages. Loads mw.user
1350                                  */
1351                                 go: function () {
1352                                         mw.loader.load( 'mediawiki.user' );
1353                                 }
1354                         };
1355                 }() ),
1356
1357                 /** HTML construction helper functions */
1358                 html: ( function () {
1359                         function escapeCallback( s ) {
1360                                 switch ( s ) {
1361                                         case "'":
1362                                                 return '&#039;';
1363                                         case '"':
1364                                                 return '&quot;';
1365                                         case '<':
1366                                                 return '&lt;';
1367                                         case '>':
1368                                                 return '&gt;';
1369                                         case '&':
1370                                                 return '&amp;';
1371                                 }
1372                         }
1373
1374                         return {
1375                                 /**
1376                                  * Escape a string for HTML. Converts special characters to HTML entities.
1377                                  * @param s The string to escape
1378                                  */
1379                                 escape: function ( s ) {
1380                                         return s.replace( /['"<>&]/g, escapeCallback );
1381                                 },
1382
1383                                 /**
1384                                  * Wrapper object for raw HTML passed to mw.html.element().
1385                                  * @constructor
1386                                  */
1387                                 Raw: function ( value ) {
1388                                         this.value = value;
1389                                 },
1390
1391                                 /**
1392                                  * Wrapper object for CDATA element contents passed to mw.html.element()
1393                                  * @constructor
1394                                  */
1395                                 Cdata: function ( value ) {
1396                                         this.value = value;
1397                                 },
1398
1399                                 /**
1400                                  * Create an HTML element string, with safe escaping.
1401                                  *
1402                                  * @param name The tag name.
1403                                  * @param attrs An object with members mapping element names to values
1404                                  * @param contents The contents of the element. May be either:
1405                                  *  - string: The string is escaped.
1406                                  *  - null or undefined: The short closing form is used, e.g. <br/>.
1407                                  *  - this.Raw: The value attribute is included without escaping.
1408                                  *  - this.Cdata: The value attribute is included, and an exception is
1409                                  *   thrown if it contains an illegal ETAGO delimiter.
1410                                  *   See http://www.w3.org/TR/1999/REC-html401-19991224/appendix/notes.html#h-B.3.2
1411                                  *
1412                                  * Example:
1413                                  *      var h = mw.html;
1414                                  *      return h.element( 'div', {},
1415                                  *              new h.Raw( h.element( 'img', {src: '<'} ) ) );
1416                                  * Returns <div><img src="&lt;"/></div>
1417                                  */
1418                                 element: function ( name, attrs, contents ) {
1419                                         var v, attrName, s = '<' + name;
1420
1421                                         for ( attrName in attrs ) {
1422                                                 v = attrs[attrName];
1423                                                 // Convert name=true, to name=name
1424                                                 if ( v === true ) {
1425                                                         v = attrName;
1426                                                 // Skip name=false
1427                                                 } else if ( v === false ) {
1428                                                         continue;
1429                                                 }
1430                                                 s += ' ' + attrName + '="' + this.escape( String( v ) ) + '"';
1431                                         }
1432                                         if ( contents === undefined || contents === null ) {
1433                                                 // Self close tag
1434                                                 s += '/>';
1435                                                 return s;
1436                                         }
1437                                         // Regular open tag
1438                                         s += '>';
1439                                         switch ( typeof contents ) {
1440                                                 case 'string':
1441                                                         // Escaped
1442                                                         s += this.escape( contents );
1443                                                         break;
1444                                                 case 'number':
1445                                                 case 'boolean':
1446                                                         // Convert to string
1447                                                         s += String( contents );
1448                                                         break;
1449                                                 default:
1450                                                         if ( contents instanceof this.Raw ) {
1451                                                                 // Raw HTML inclusion
1452                                                                 s += contents.value;
1453                                                         } else if ( contents instanceof this.Cdata ) {
1454                                                                 // CDATA
1455                                                                 if ( /<\/[a-zA-z]/.test( contents.value ) ) {
1456                                                                         throw new Error( 'mw.html.element: Illegal end tag found in CDATA' );
1457                                                                 }
1458                                                                 s += contents.value;
1459                                                         } else {
1460                                                                 throw new Error( 'mw.html.element: Invalid type of contents' );
1461                                                         }
1462                                         }
1463                                         s += '</' + name + '>';
1464                                         return s;
1465                                 }
1466                         };
1467                 }() ),
1468
1469                 // Skeleton user object. mediawiki.user.js extends this
1470                 user: {
1471                         options: new Map(),
1472                         tokens: new Map()
1473                 }
1474         };
1475
1476 }( jQuery ) );
1477
1478 // Alias $j to jQuery for backwards compatibility
1479 window.$j = jQuery;
1480
1481 // Attach to window and globally alias
1482 window.mw = window.mediaWiki = mw;
1483
1484 // Auto-register from pre-loaded startup scripts
1485 if ( jQuery.isFunction( window.startUp ) ) {
1486         window.startUp();
1487         window.startUp = undefined;
1488 }