resources/mediawiki/mediawiki.js

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