resources/mediawiki/mediawiki.js

   1 /*
   2  * Core MediaWiki JavaScript Library
   3  */
   4
   5 // Attach to window
   6 window.mediaWiki = new ( function( $ ) {
   7
   8         /* Constants */
   9
  10         /* Private Members */
  11
  12         // List of messages that have been requested to be loaded
  13         var messageQueue = {};
  14
  15         /* Prototypes */
  16
  17         /**
  18          * An object which allows single and multiple get/set/exists functionality
  19          * on a list of key / value pairs.
  20          *
  21          * @param {boolean} global Whether to get/set/exists values on the window
  22          *   object or a private object
  23          */
  24         function Map( global ) {
  25                 this.values = ( global === true ) ? window : {};
  26         }
  27
  28         /**
  29          * Gets the value of a key, or a list of key/value pairs for an array of keys.
  30          *
  31          * If called with no arguments, all values will be returned.
  32          *
  33          * @param selection mixed Key or array of keys to get values for
  34          * @param fallback mixed Value to use in case key(s) do not exist (optional)
  35          */
  36         Map.prototype.get = function( selection, fallback ) {
  37                 if ( typeof selection === 'object' ) {
  38                         selection = $.makeArray( selection );
  39                         var results = {};
  40                         for ( var i = 0; i < selection.length; i++ ) {
  41                                 results[selection[i]] = this.get( selection[i], fallback );
  42                         }
  43                         return results;
  44                 } else if ( typeof selection === 'string' ) {
  45                         if ( typeof this.values[selection] === 'undefined' ) {
  46                                 if ( typeof fallback !== 'undefined' ) {
  47                                         return fallback;
  48                                 }
  49                                 return null;
  50                         }
  51                         return this.values[selection];
  52                 }
  53                 return this.values;
  54         };
  55
  56         /**
  57          * Sets one or multiple key/value pairs.
  58          *
  59          * @param selection mixed Key or object of key/value pairs to set
  60          * @param value mixed Value to set (optional, only in use when key is a string)
  61          */
  62         Map.prototype.set = function( selection, value ) {
  63                 if ( typeof selection === 'object' ) {
  64                         for ( var s in selection ) {
  65                                 this.values[s] = selection[s];
  66                         }
  67                         return true;
  68                 } else if ( typeof selection === 'string' && typeof value !== 'undefined' ) {
  69                         this.values[selection] = value;
  70                         return true;
  71                 }
  72                 return false;
  73         };
  74
  75         /**
  76          * Checks if one or multiple keys exist.
  77          *
  78          * @param selection mixed Key or array of keys to check
  79          * @return boolean Existence of key(s)
  80          */
  81         Map.prototype.exists = function( selection ) {
  82                 if ( typeof selection === 'object' ) {
  83                         for ( var s = 0; s < selection.length; s++ ) {
  84                                 if ( !( selection[s] in this.values ) ) {
  85                                         return false;
  86                                 }
  87                         }
  88                         return true;
  89                 } else {
  90                         return selection in this.values;
  91                 }
  92         };
  93
  94         /**
  95          * Message object, similar to Message in PHP
  96          */
  97         function Message( map, key, parameters ) {
  98                 this.format = 'parse';
  99                 this.map = map;
 100                 this.key = key;
 101                 this.parameters = typeof parameters === 'undefined' ? [] : $.makeArray( parameters );
 102         }
 103
 104         /**
 105          * Appends parameters for replacement
 106          *
 107          * @param parameters mixed First in a list of variadic arguments to append as message parameters
 108          */
 109         Message.prototype.params = function( parameters ) {
 110                 for ( var i = 0; i < parameters.length; i++ ) {
 111                         this.parameters[this.parameters.length] = parameters[i];
 112                 }
 113                 return this;
 114         };
 115
 116         /**
 117          * Converts message object to it's string form based on the state of format
 118          *
 119          * @return {string} String form of message
 120          */
 121         Message.prototype.toString = function() {
 122                 if ( !this.map.exists( this.key ) ) {
 123                         // Return <key> if key does not exist
 124                         return '<' + this.key + '>';
 125                 }
 126                 var text = this.map.get( this.key );
 127                 var parameters = this.parameters;
 128                 text = text.replace( /\$(\d+)/g, function( string, match ) {
 129                         var index = parseInt( match, 10 ) - 1;
 130                         return index in parameters ? parameters[index] : '$' + match;
 131                 } );
 132
 133                 if ( this.format === 'plain' ) {
 134                         return text;
 135                 }
 136                 if ( this.format === 'escaped' ) {
 137                         // According to Message.php this needs {{-transformation, which is
 138                         // still todo
 139                         return mw.html.escape( text );
 140                 }
 141
 142                 /* This should be fixed up when we have a parser
 143                 if ( this.format === 'parse' && 'language' in mediaWiki ) {
 144                         text = mw.language.parse( text );
 145                 }
 146                 */
 147                 return text;
 148         };
 149
 150         /**
 151          * Changes format to parse and converts message to string
 152          *
 153          * @return {string} String form of parsed message
 154          */
 155         Message.prototype.parse = function() {
 156                 this.format = 'parse';
 157                 return this.toString();
 158         };
 159
 160         /**
 161          * Changes format to plain and converts message to string
 162          *
 163          * @return {string} String form of plain message
 164          */
 165         Message.prototype.plain = function() {
 166                 this.format = 'plain';
 167                 return this.toString();
 168         };
 169
 170         /**
 171          * Changes the format to html escaped and converts message to string
 172          *
 173          * @return {string} String form of html escaped message
 174          */
 175         Message.prototype.escaped = function() {
 176                 this.format = 'escaped';
 177                 return this.toString();
 178         };
 179
 180         /**
 181          * Checks if message exists
 182          *
 183          * @return {string} String form of parsed message
 184          */
 185         Message.prototype.exists = function() {
 186                 return this.map.exists( this.key );
 187         };
 188
 189         /* Public Members */
 190
 191         /*
 192          * Dummy function which in debug mode can be replaced with a function that
 193          * does something clever
 194          */
 195         this.log = function() { };
 196
 197         /*
 198          * Make the Map-class publicly available
 199          */
 200         this.Map = Map;
 201
 202         /*
 203          * List of configuration values
 204          *
 205          * Dummy placeholder. Initiated in startUp module as a new instance of mw.Map().
 206          * If $wgLegacyJavaScriptGlobals is true, this Map will have its values
 207          * in the global window object.
 208          */
 209         this.config = null;
 210
 211         /*
 212          * Localization system
 213          */
 214         this.messages = new this.Map();
 215
 216         /* Public Methods */
 217
 218         /**
 219          * Gets a message object, similar to wfMessage()
 220          *
 221          * @param key string Key of message to get
 222          * @param parameters mixed First argument in a list of variadic arguments, each a parameter for $
 223          * replacement
 224          */
 225         this.message = function( key, parameters ) {
 226                 // Support variadic arguments
 227                 if ( typeof parameters !== 'undefined' ) {
 228                         parameters = $.makeArray( arguments );
 229                         parameters.shift();
 230                 } else {
 231                         parameters = [];
 232                 }
 233                 return new Message( mw.messages, key, parameters );
 234         };
 235
 236         /**
 237          * Gets a message string, similar to wfMsg()
 238          *
 239          * @param key string Key of message to get
 240          * @param parameters mixed First argument in a list of variadic arguments, each a parameter for $
 241          * replacement
 242          */
 243         this.msg = function( key, parameters ) {
 244                 return mw.message.apply( mw.message, arguments ).toString();
 245         };
 246
 247         /**
 248          * Client-side module loader which integrates with the MediaWiki ResourceLoader
 249          */
 250         this.loader = new ( function() {
 251
 252                 /* Private Members */
 253
 254                 /**
 255                  * Mapping of registered modules
 256                  *
 257                  * The jquery module is pre-registered, because it must have already
 258                  * been provided for this object to have been built, and in debug mode
 259                  * jquery would have been provided through a unique loader request,
 260                  * making it impossible to hold back registration of jquery until after
 261                  * mediawiki.
 262                  *
 263                  * Format:
 264                  *   {
 265                  *     'moduleName': {
 266                  *       'dependencies': ['required module', 'required module', ...], (or) function() {}
 267                  *       'state': 'registered', 'loading', 'loaded', 'ready', or 'error'
 268                  *       'script': function() {},
 269                  *       'style': 'css code string',
 270                  *       'messages': { 'key': 'value' },
 271                  *       'version': ############## (unix timestamp)
 272                  *     }
 273                  *   }
 274                  */
 275                 var registry = {};
 276                 // List of modules which will be loaded as when ready
 277                 var batch = [];
 278                 // List of modules to be loaded
 279                 var queue = [];
 280                 // List of callback functions waiting for modules to be ready to be called
 281                 var jobs = [];
 282                 // Flag inidicating that document ready has occured
 283                 var ready = false;
 284                 // Selector cache for the marker element. Use getMarker() to get/use the marker!
 285                 var $marker = null;
 286
 287                 /* Private Methods */
 288
 289                 function getMarker(){
 290                         // Cached ?
 291                         if ( $marker ) {
 292                                 return $marker;
 293                         } else {
 294                                 $marker = $( 'meta[name="ResourceLoaderDynamicStyles"]' );
 295                                 if ( $marker.length ) {
 296                                         return $marker;
 297                                 }
 298                                 mw.log( 'getMarker> No <meta name="ResourceLoaderDynamicStyles"> found, inserting dynamically.' );
 299                                 return $marker = $( '<meta>' ).attr( 'name', 'ResourceLoaderDynamicStyles' ).appendTo( 'head' );
 300                         }
 301                 }
 302
 303                 function compare( a, b ) {
 304                         if ( a.length != b.length ) {
 305                                 return false;
 306                         }
 307                         for ( var i = 0; i < b.length; i++ ) {
 308                                 if ( $.isArray( a[i] ) ) {
 309                                         if ( !compare( a[i], b[i] ) ) {
 310                                                 return false;
 311                                         }
 312                                 }
 313                                 if ( a[i] !== b[i] ) {
 314                                         return false;
 315                                 }
 316                         }
 317                         return true;
 318                 }
 319
 320                 /**
 321                  * Generates an ISO8601 "basic" string from a UNIX timestamp
 322                  */
 323                 function formatVersionNumber( timestamp ) {
 324                         function pad( a, b, c ) {
 325                                 return [a < 10 ? '0' + a : a, b < 10 ? '0' + b : b, c < 10 ? '0' + c : c].join( '' );
 326                         }
 327                         var d = new Date();
 328                         d.setTime( timestamp * 1000 );
 329                         return [
 330                                 pad( d.getUTCFullYear(), d.getUTCMonth() + 1, d.getUTCDate() ), 'T',
 331                                 pad( d.getUTCHours(), d.getUTCMinutes(), d.getUTCSeconds() ), 'Z'
 332                         ].join( '' );
 333                 }
 334
 335                 /**
 336                  * Recursively resolves dependencies and detects circular references
 337                  */
 338                 function recurse( module, resolved, unresolved ) {
 339                         if ( typeof registry[module] === 'undefined' ) {
 340                                 throw new Error( 'Unknown dependency: ' + module );
 341                         }
 342                         // Resolves dynamic loader function and replaces it with its own results
 343                         if ( $.isFunction( registry[module].dependencies ) ) {
 344                                 registry[module].dependencies = registry[module].dependencies();
 345                                 // Ensures the module's dependencies are always in an array
 346                                 if ( typeof registry[module].dependencies !== 'object' ) {
 347                                         registry[module].dependencies = [registry[module].dependencies];
 348                                 }
 349                         }
 350                         // Tracks down dependencies
 351                         for ( var n = 0; n < registry[module].dependencies.length; n++ ) {
 352                                 if ( $.inArray( registry[module].dependencies[n], resolved ) === -1 ) {
 353                                         if ( $.inArray( registry[module].dependencies[n], unresolved ) !== -1 ) {
 354                                                 throw new Error(
 355                                                         'Circular reference detected: ' + module +
 356                                                         ' -> ' + registry[module].dependencies[n]
 357                                                 );
 358                                         }
 359                                         recurse( registry[module].dependencies[n], resolved, unresolved );
 360                                 }
 361                         }
 362                         resolved[resolved.length] = module;
 363                         unresolved.splice( $.inArray( module, unresolved ), 1 );
 364                 }
 365
 366                 /**
 367                  * Gets a list of module names that a module depends on in their proper dependency order
 368                  *
 369                  * @param module string module name or array of string module names
 370                  * @return list of dependencies
 371                  * @throws Error if circular reference is detected
 372                  */
 373                 function resolve( module ) {
 374                         // Allow calling with an array of module names
 375                         if ( typeof module === 'object' ) {
 376                                 var modules = [];
 377                                 for ( var m = 0; m < module.length; m++ ) {
 378                                         var dependencies = resolve( module[m] );
 379                                         for ( var n = 0; n < dependencies.length; n++ ) {
 380                                                 modules[modules.length] = dependencies[n];
 381                                         }
 382                                 }
 383                                 return modules;
 384                         } else if ( typeof module === 'string' ) {
 385                                 // Undefined modules have no dependencies
 386                                 if ( !( module in registry ) ) {
 387                                         return [];
 388                                 }
 389                                 var resolved = [];
 390                                 recurse( module, resolved, [] );
 391                                 return resolved;
 392                         }
 393                         throw new Error( 'Invalid module argument: ' + module );
 394                 }
 395
 396                 /**
 397                  * Narrows a list of module names down to those matching a specific
 398                  * state. Possible states are 'undefined', 'registered', 'loading',
 399                  * 'loaded', or 'ready'
 400                  *
 401                  * @param states string or array of strings of module states to filter by
 402                  * @param modules array list of module names to filter (optional, all modules
 403                  *   will be used by default)
 404                  * @return array list of filtered module names
 405                  */
 406                 function filter( states, modules ) {
 407                         // Allow states to be given as a string
 408                         if ( typeof states === 'string' ) {
 409                                 states = [states];
 410                         }
 411                         // If called without a list of modules, build and use a list of all modules
 412                         var list = [], module;
 413                         if ( typeof modules === 'undefined' ) {
 414                                 modules = [];
 415                                 for ( module in registry ) {
 416                                         modules[modules.length] = module;
 417                                 }
 418                         }
 419                         // Build a list of modules which are in one of the specified states
 420                         for ( var s = 0; s < states.length; s++ ) {
 421                                 for ( var m = 0; m < modules.length; m++ ) {
 422                                         if ( typeof registry[modules[m]] === 'undefined' ) {
 423                                                 // Module does not exist
 424                                                 if ( states[s] == 'undefined' ) {
 425                                                         // OK, undefined
 426                                                         list[list.length] = modules[m];
 427                                                 }
 428                                         } else {
 429                                                 // Module exists, check state
 430                                                 if ( registry[modules[m]].state === states[s] ) {
 431                                                         // OK, correct state
 432                                                         list[list.length] = modules[m];
 433                                                 }
 434                                         }
 435                                 }
 436                         }
 437                         return list;
 438                 }
 439
 440                 /**
 441                  * Executes a loaded module, making it ready to use
 442                  *
 443                  * @param module string module name to execute
 444                  */
 445                 function execute( module, callback ) {
 446                         var _fn = 'mw.loader::execute> ';
 447                         if ( typeof registry[module] === 'undefined' ) {
 448                                 throw new Error( 'Module has not been registered yet: ' + module );
 449                         } else if ( registry[module].state === 'registered' ) {
 450                                 throw new Error( 'Module has not been requested from the server yet: ' + module );
 451                         } else if ( registry[module].state === 'loading' ) {
 452                                 throw new Error( 'Module has not completed loading yet: ' + module );
 453                         } else if ( registry[module].state === 'ready' ) {
 454                                 throw new Error( 'Module has already been loaded: ' + module );
 455                         }
 456                         // Add styles
 457                         if ( $.isPlainObject( registry[module].style ) ) {
 458                                 for ( var media in registry[module].style ) {
 459                                         var style = registry[module].style[media];
 460                                         if ( $.isArray( style ) ) {
 461                                                 for ( var i = 0; i < style.length; i++ ) {
 462                                                         getMarker().before( mw.html.element( 'link', {
 463                                                                 'type': 'text/css',
 464                                                                 'rel': 'stylesheet',
 465                                                                 'href': style[i]
 466                                                         } ) );
 467                                                 }
 468                                         } else if ( typeof style === 'string' ) {
 469                                                 getMarker().before( mw.html.element(
 470                                                         'style',
 471                                                         { 'type': 'text/css', 'media': media },
 472                                                         new mw.html.Cdata( style )
 473                                                 ) );
 474                                         }
 475                                 }
 476                         }
 477                         // Add localizations to message system
 478                         if ( $.isPlainObject( registry[module].messages ) ) {
 479                                 mw.messages.set( registry[module].messages );
 480                         }
 481                         // Execute script
 482                         try {
 483                                 var script = registry[module].script;
 484                                 var markModuleReady = function() {
 485                                         registry[module].state = 'ready';
 486                                         handlePending( module );
 487                                         if ( $.isFunction( callback ) ) {
 488                                                 callback();
 489                                         }
 490                                 };
 491                                 if ( $.isArray( script ) ) {
 492                                         var done = 0;
 493                                         if (script.length == 0 ) {
 494                                                 // No scripts in this module? Let's dive out early.
 495                                                 markModuleReady();
 496                                         }
 497                                         for ( var i = 0; i < script.length; i++ ) {
 498                                                 registry[module].state = 'loading';
 499                                                 addScript( script[i], function() {
 500                                                         if ( ++done == script.length ) {
 501                                                                 markModuleReady();
 502                                                         }
 503                                                 } );
 504                                         }
 505                                 } else if ( $.isFunction( script ) ) {
 506                                         script( jQuery );
 507                                         markModuleReady();
 508                                 }
 509                         } catch ( e ) {
 510                                 // This needs to NOT use mw.log because these errors are common in production mode
 511                                 // and not in debug mode, such as when a symbol that should be global isn't exported
 512                                 if ( window.console && typeof window.console.log === 'function' ) {
 513                                         console.log( _fn + 'Exception thrown by ' + module + ': ' + e.message );
 514                                 }
 515                                 throw e;
 516                                 registry[module].state = 'error';
 517                         }
 518                 }
 519
 520                 /**
 521                  * Automatically executes jobs and modules which are pending with satistifed dependencies.
 522                  *
 523                  * This is used when dependencies are satisfied, such as when a module is executed.
 524                  */
 525                 function handlePending( module ) {
 526                         try {
 527                                 // Run jobs who's dependencies have just been met
 528                                 for ( var j = 0; j < jobs.length; j++ ) {
 529                                         if ( compare(
 530                                                 filter( 'ready', jobs[j].dependencies ),
 531                                                 jobs[j].dependencies ) )
 532                                         {
 533                                                 if ( $.isFunction( jobs[j].ready ) ) {
 534                                                         jobs[j].ready();
 535                                                 }
 536                                                 jobs.splice( j, 1 );
 537                                                 j--;
 538                                         }
 539                                 }
 540                                 // Execute modules who's dependencies have just been met
 541                                 for ( var r in registry ) {
 542                                         if ( registry[r].state == 'loaded' ) {
 543                                                 if ( compare(
 544                                                         filter( ['ready'], registry[r].dependencies ),
 545                                                         registry[r].dependencies ) )
 546                                                 {
 547                                                         execute( r );
 548                                                 }
 549                                         }
 550                                 }
 551                         } catch ( e ) {
 552                                 // Run error callbacks of jobs affected by this condition
 553                                 for ( var j = 0; j < jobs.length; j++ ) {
 554                                         if ( $.inArray( module, jobs[j].dependencies ) !== -1 ) {
 555                                                 if ( $.isFunction( jobs[j].error ) ) {
 556                                                         jobs[j].error();
 557                                                 }
 558                                                 jobs.splice( j, 1 );
 559                                                 j--;
 560                                         }
 561                                 }
 562                         }
 563                 }
 564
 565                 /**
 566                  * Adds a dependencies to the queue with optional callbacks to be run
 567                  * when the dependencies are ready or fail
 568                  *
 569                  * @param dependencies string module name or array of string module names
 570                  * @param ready function callback to execute when all dependencies are ready
 571                  * @param error function callback to execute when any dependency fails
 572                  */
 573                 function request( dependencies, ready, error ) {
 574                         // Allow calling by single module name
 575                         if ( typeof dependencies === 'string' ) {
 576                                 dependencies = [dependencies];
 577                                 if ( dependencies[0] in registry ) {
 578                                         for ( var n = 0; n < registry[dependencies[0]].dependencies.length; n++ ) {
 579                                                 dependencies[dependencies.length] =
 580                                                         registry[dependencies[0]].dependencies[n];
 581                                         }
 582                                 }
 583                         }
 584                         // Add ready and error callbacks if they were given
 585                         if ( arguments.length > 1 ) {
 586                                 jobs[jobs.length] = {
 587                                         'dependencies': filter(
 588                                                 ['undefined', 'registered', 'loading', 'loaded'],
 589                                                 dependencies ),
 590                                         'ready': ready,
 591                                         'error': error
 592                                 };
 593                         }
 594                         // Queue up any dependencies that are undefined or registered
 595                         dependencies = filter( ['undefined', 'registered'], dependencies );
 596                         for ( var n = 0; n < dependencies.length; n++ ) {
 597                                 if ( $.inArray( dependencies[n], queue ) === -1 ) {
 598                                         queue[queue.length] = dependencies[n];
 599                                 }
 600                         }
 601                         // Work the queue
 602                         mw.loader.work();
 603                 }
 604
 605                 function sortQuery(o) {
 606                         var sorted = {}, key, a = [];
 607                         for ( key in o ) {
 608                                 if ( o.hasOwnProperty( key ) ) {
 609                                         a.push( key );
 610                                 }
 611                         }
 612                         a.sort();
 613                         for ( key = 0; key < a.length; key++ ) {
 614                                 sorted[a[key]] = o[a[key]];
 615                         }
 616                         return sorted;
 617                 }
 618
 619                 /**
 620                  * Converts a module map of the form { foo: [ 'bar', 'baz' ], bar: [ 'baz, 'quux' ] }
 621                  * to a query string of the form foo.bar,baz|bar.baz,quux
 622                  */
 623                 function buildModulesString( moduleMap ) {
 624                         var arr = [];
 625                         for ( var prefix in moduleMap ) {
 626                                 var p = prefix === '' ? '' : prefix + '.';
 627                                 arr.push( p + moduleMap[prefix].join( ',' ) );
 628                         }
 629                         return arr.join( '|' ).replace( /\./g, '!' );
 630                 }
 631
 632                 /**
 633                  * Adds a script tag to the body, either using document.write or low-level DOM manipulation,
 634                  * depending on whether document-ready has occured yet.
 635                  *
 636                  * @param src String: URL to script, will be used as the src attribute in the script tag
 637                  * @param callback Function: Optional callback which will be run when the script is done
 638                  */
 639                 function addScript( src, callback ) {
 640                         if ( ready ) {
 641                                 // jQuery's getScript method is NOT better than doing this the old-fassioned way
 642                                 // because jQuery will eval the script's code, and errors will not have sane
 643                                 // line numbers.
 644                                 var script = document.createElement( 'script' );
 645                                 script.setAttribute( 'src', src );
 646                                 script.setAttribute( 'type', 'text/javascript' );
 647                                 if ( $.isFunction( callback ) ) {
 648                                         var done = false;
 649                                         // Attach handlers for all browsers -- this is based on jQuery.getScript
 650                                         script.onload = script.onreadystatechange = function() {
 651                                                 if (
 652                                                         !done
 653                                                         && (
 654                                                                 !this.readyState
 655                                                                 || this.readyState === "loaded"
 656                                                                 || this.readyState === "complete"
 657                                                         )
 658                                                 ) {
 659                                                         done = true;
 660                                                         callback();
 661                                                         // Handle memory leak in IE
 662                                                         script.onload = script.onreadystatechange = null;
 663                                                         if ( script.parentNode ) {
 664                                                                 script.parentNode.removeChild( script );
 665                                                         }
 666                                                 }
 667                                         };
 668                                 }
 669                                 document.body.appendChild( script );
 670                         } else {
 671                                 document.write( mw.html.element(
 672                                         'script', { 'type': 'text/javascript', 'src': src }, ''
 673                                 ) );
 674                                 if ( $.isFunction( callback ) ) {
 675                                         // Document.write is synchronous, so this is called when it's done
 676                                         callback();
 677                                 }
 678                         }
 679                 }
 680
 681                 /* Public Methods */
 682
 683                 /**
 684                  * Requests dependencies from server, loading and executing when things when ready.
 685                  */
 686                 this.work = function() {
 687                         // Appends a list of modules to the batch
 688                         for ( var q = 0; q < queue.length; q++ ) {
 689                                 // Only request modules which are undefined or registered
 690                                 if ( !( queue[q] in registry ) || registry[queue[q]].state == 'registered' ) {
 691                                         // Prevent duplicate entries
 692                                         if ( $.inArray( queue[q], batch ) === -1 ) {
 693                                                 batch[batch.length] = queue[q];
 694                                                 // Mark registered modules as loading
 695                                                 if ( queue[q] in registry ) {
 696                                                         registry[queue[q]].state = 'loading';
 697                                                 }
 698                                         }
 699                                 }
 700                         }
 701                         // Early exit if there's nothing to load
 702                         if ( !batch.length ) {
 703                                 return;
 704                         }
 705                         // Clean up the queue
 706                         queue = [];
 707                         // Always order modules alphabetically to help reduce cache
 708                         // misses for otherwise identical content
 709                         batch.sort();
 710                         // Build a list of request parameters
 711                         var base = {
 712                                 'skin': mw.config.get( 'skin' ),
 713                                 'lang': mw.config.get( 'wgUserLanguage' ),
 714                                 'debug': mw.config.get( 'debug' )
 715                         };
 716                         // Extend request parameters with a list of modules in the batch
 717                         var requests = [];
 718                         // Split into groups
 719                         var groups = {};
 720                         for ( var b = 0; b < batch.length; b++ ) {
 721                                 var group = registry[batch[b]].group;
 722                                 if ( !( group in groups ) ) {
 723                                         groups[group] = [];
 724                                 }
 725                                 groups[group][groups[group].length] = batch[b];
 726                         }
 727                         for ( var group in groups ) {
 728                                 // Calculate the highest timestamp
 729                                 var version = 0;
 730                                 for ( var g = 0; g < groups[group].length; g++ ) {
 731                                         if ( registry[groups[group][g]].version > version ) {
 732                                                 version = registry[groups[group][g]].version;
 733                                         }
 734                                 }
 735                                 var reqBase = $.extend( { 'version': formatVersionNumber( version ) }, base );
 736                                 var reqBaseLength = $.param( reqBase ).length;
 737                                 var reqs = [];
 738                                 var limit = mw.config.get( 'wgResourceLoaderMaxQueryLength', -1 );
 739                                 // We may need to split up the request to honor the query string length limit
 740                                 // So build it piece by piece
 741                                 var l = reqBaseLength + 9; // '&modules='.length == 9
 742                                 var r = 0;
 743                                 reqs[0] = {}; // { prefix: [ suffixes ] }
 744                                 for ( var i = 0; i < groups[group].length; i++ ) {
 745                                         // Determine how many bytes this module would add to the query string
 746                                         var lastDotIndex = groups[group][i].lastIndexOf( '.' );
 747                                         // Note that these substr() calls work even if lastDotIndex == -1
 748                                         var prefix = groups[group][i].substr( 0, lastDotIndex );
 749                                         var suffix = groups[group][i].substr( lastDotIndex + 1 );
 750                                         var bytesAdded = prefix in reqs[r] ?
 751                                                 suffix.length + 3 : // '%2C'.length == 3
 752                                                 groups[group][i].length + 3; // '%7C'.length == 3
 753
 754                                         // If the request would become too long, create a new one,
 755                                         // but don't create empty requests
 756                                         if ( limit > 0 &&  reqs[r] != {} && l + bytesAdded > limit ) {
 757                                                 // This request would become too long, create a new one
 758                                                 r++;
 759                                                 reqs[r] = {};
 760                                                 l = reqBaseLength + 9;
 761                                         }
 762                                         if ( !( prefix in reqs[r] ) ) {
 763                                                 reqs[r][prefix] = [];
 764                                         }
 765                                         reqs[r][prefix].push( suffix );
 766                                         l += bytesAdded;
 767                                 }
 768                                 for ( var r = 0; r < reqs.length; r++ ) {
 769                                         requests[requests.length] = $.extend(
 770                                                 { 'modules': buildModulesString( reqs[r] ) }, reqBase
 771                                         );
 772                                 }
 773                         }
 774                         // Clear the batch - this MUST happen before we append the
 775                         // script element to the body or it's possible that the script
 776                         // will be locally cached, instantly load, and work the batch
 777                         // again, all before we've cleared it causing each request to
 778                         // include modules which are already loaded
 779                         batch = [];
 780                         // Asynchronously append a script tag to the end of the body
 781                         for ( var r = 0; r < requests.length; r++ ) {
 782                                 requests[r] = sortQuery( requests[r] );
 783                                 var src = mw.config.get( 'wgLoadScript' ) + '?' + $.param( requests[r] );
 784                                 addScript( src );
 785                         }
 786                 };
 787
 788                 /**
 789                  * Registers a module, letting the system know about it and its
 790                  * dependencies. loader.js files contain calls to this function.
 791                  */
 792                 this.register = function( module, version, dependencies, group ) {
 793                         // Allow multiple registration
 794                         if ( typeof module === 'object' ) {
 795                                 for ( var m = 0; m < module.length; m++ ) {
 796                                         if ( typeof module[m] === 'string' ) {
 797                                                 mw.loader.register( module[m] );
 798                                         } else if ( typeof module[m] === 'object' ) {
 799                                                 mw.loader.register.apply( mw.loader, module[m] );
 800                                         }
 801                                 }
 802                                 return;
 803                         }
 804                         // Validate input
 805                         if ( typeof module !== 'string' ) {
 806                                 throw new Error( 'module must be a string, not a ' + typeof module );
 807                         }
 808                         if ( typeof registry[module] !== 'undefined' ) {
 809                                 throw new Error( 'module already implemented: ' + module );
 810                         }
 811                         // List the module as registered
 812                         registry[module] = {
 813                                 'state': 'registered',
 814                                 'group': typeof group === 'string' ? group : null,
 815                                 'dependencies': [],
 816                                 'version': typeof version !== 'undefined' ? parseInt( version, 10 ) : 0
 817                         };
 818                         if ( typeof dependencies === 'string' ) {
 819                                 // Allow dependencies to be given as a single module name
 820                                 registry[module].dependencies = [dependencies];
 821                         } else if ( typeof dependencies === 'object' || $.isFunction( dependencies ) ) {
 822                                 // Allow dependencies to be given as an array of module names
 823                                 // or a function which returns an array
 824                                 registry[module].dependencies = dependencies;
 825                         }
 826                 };
 827
 828                 /**
 829                  * Implements a module, giving the system a course of action to take
 830                  * upon loading. Results of a request for one or more modules contain
 831                  * calls to this function.
 832                  *
 833                  * All arguments are required.
 834                  *
 835                  * @param module String: Name of module
 836                  * @param script Mixed: Function of module code or String of URL to be used as the src
 837                  * attribute when adding a script element to the body
 838                  * @param style Object: Object of CSS strings keyed by media-type or Object of lists of URLs
 839                  * keyed by media-type
 840                  * @param msgs Object: List of key/value pairs to be passed through mw.messages.set
 841                  */
 842                 this.implement = function( module, script, style, msgs ) {
 843                         // Validate input
 844                         if ( typeof module !== 'string' ) {
 845                                 throw new Error( 'module must be a string, not a ' + typeof module );
 846                         }
 847                         if ( !$.isFunction( script ) && !$.isArray( script ) ) {
 848                                 throw new Error( 'script must be a function or an array, not a ' + typeof script );
 849                         }
 850                         if ( !$.isPlainObject( style ) ) {
 851                                 throw new Error( 'style must be an object, not a ' + typeof style );
 852                         }
 853                         if ( !$.isPlainObject( msgs ) ) {
 854                                 throw new Error( 'msgs must be an object, not a ' + typeof msgs );
 855                         }
 856                         // Automatically register module
 857                         if ( typeof registry[module] === 'undefined' ) {
 858                                 mw.loader.register( module );
 859                         }
 860                         // Check for duplicate implementation
 861                         if ( typeof registry[module] !== 'undefined'
 862                                 && typeof registry[module].script !== 'undefined' )
 863                         {
 864                                 throw new Error( 'module already implemeneted: ' + module );
 865                         }
 866                         // Mark module as loaded
 867                         registry[module].state = 'loaded';
 868                         // Attach components
 869                         registry[module].script = script;
 870                         registry[module].style = style;
 871                         registry[module].messages = msgs;
 872                         // Execute or queue callback
 873                         if ( compare(
 874                                 filter( ['ready'], registry[module].dependencies ),
 875                                 registry[module].dependencies ) )
 876                         {
 877                                 execute( module );
 878                         } else {
 879                                 request( module );
 880                         }
 881                 };
 882
 883                 /**
 884                  * Executes a function as soon as one or more required modules are ready
 885                  *
 886                  * @param dependencies string or array of strings of modules names the callback
 887                  *   dependencies to be ready before
 888                  * executing
 889                  * @param ready function callback to execute when all dependencies are ready (optional)
 890                  * @param error function callback to execute when if dependencies have a errors (optional)
 891                  */
 892                 this.using = function( dependencies, ready, error ) {
 893                         // Validate input
 894                         if ( typeof dependencies !== 'object' && typeof dependencies !== 'string' ) {
 895                                 throw new Error( 'dependencies must be a string or an array, not a ' +
 896                                         typeof dependencies );
 897                         }
 898                         // Allow calling with a single dependency as a string
 899                         if ( typeof dependencies === 'string' ) {
 900                                 dependencies = [dependencies];
 901                         }
 902                         // Resolve entire dependency map
 903                         dependencies = resolve( dependencies );
 904                         // If all dependencies are met, execute ready immediately
 905                         if ( compare( filter( ['ready'], dependencies ), dependencies ) ) {
 906                                 if ( $.isFunction( ready ) ) {
 907                                         ready();
 908                                 }
 909                         }
 910                         // If any dependencies have errors execute error immediately
 911                         else if ( filter( ['error'], dependencies ).length ) {
 912                                 if ( $.isFunction( error ) ) {
 913                                         error();
 914                                 }
 915                         }
 916                         // Since some dependencies are not yet ready, queue up a request
 917                         else {
 918                                 request( dependencies, ready, error );
 919                         }
 920                 };
 921
 922                 /**
 923                  * Loads an external script or one or more modules for future use
 924                  *
 925                  * @param modules mixed either the name of a module, array of modules,
 926                  *   or a URL of an external script or style
 927                  * @param type string mime-type to use if calling with a URL of an
 928                  *   external script or style; acceptable values are "text/css" and
 929                  *   "text/javascript"; if no type is provided, text/javascript is
 930                  *   assumed
 931                  */
 932                 this.load = function( modules, type ) {
 933                         // Validate input
 934                         if ( typeof modules !== 'object' && typeof modules !== 'string' ) {
 935                                 throw new Error( 'modules must be a string or an array, not a ' +
 936                                         typeof modules );
 937                         }
 938                         // Allow calling with an external script or single dependency as a string
 939                         if ( typeof modules === 'string' ) {
 940                                 // Support adding arbitrary external scripts
 941                                 if ( modules.substr( 0, 7 ) == 'http://' || modules.substr( 0, 8 ) == 'https://' ) {
 942                                         if ( type === 'text/css' ) {
 943                                                 $( 'head' ).append( $( '<link />', {
 944                                                         rel: 'stylesheet',
 945                                                         type: 'text/css',
 946                                                         href: modules
 947                                                 } ) );
 948                                                 return true;
 949                                         } else if ( type === 'text/javascript' || typeof type === 'undefined' ) {
 950                                                 addScript( modules );
 951                                                 return true;
 952                                         }
 953                                         // Unknown type
 954                                         return false;
 955                                 }
 956                                 // Called with single module
 957                                 modules = [modules];
 958                         }
 959                         // Resolve entire dependency map
 960                         modules = resolve( modules );
 961                         // If all modules are ready, nothing dependency be done
 962                         if ( compare( filter( ['ready'], modules ), modules ) ) {
 963                                 return true;
 964                         }
 965                         // If any modules have errors return false
 966                         else if ( filter( ['error'], modules ).length ) {
 967                                 return false;
 968                         }
 969                         // Since some modules are not yet ready, queue up a request
 970                         else {
 971                                 request( modules );
 972                                 return true;
 973                         }
 974                 };
 975
 976                 /**
 977                  * Changes the state of a module
 978                  *
 979                  * @param module string module name or object of module name/state pairs
 980                  * @param state string state name
 981                  */
 982                 this.state = function( module, state ) {
 983                         if ( typeof module === 'object' ) {
 984                                 for ( var m in module ) {
 985                                         mw.loader.state( m, module[m] );
 986                                 }
 987                                 return;
 988                         }
 989                         if ( !( module in registry ) ) {
 990                                 mw.loader.register( module );
 991                         }
 992                         registry[module].state = state;
 993                 };
 994
 995                 /**
 996                  * Gets the version of a module
 997                  *
 998                  * @param module string name of module to get version for
 999                  */
1000                 this.getVersion = function( module ) {
1001                         if ( module in registry && 'version' in registry[module] ) {
1002                                 return formatVersionNumber( registry[module].version );
1003                         }
1004                         return null;
1005                 };
1006                 /**
1007                 * @deprecated use mw.loader.getVersion() instead
1008                 */
1009                 this.version = function() {
1010                         return mediaWiki.loader.getVersion.apply( mediaWiki.loader, arguments );
1011                 }
1012
1013                 /**
1014                  * Gets the state of a module
1015                  *
1016                  * @param module string name of module to get state for
1017                  */
1018                 this.getState = function( module ) {
1019                         if ( module in registry && 'state' in registry[module] ) {
1020                                 return registry[module].state;
1021                         }
1022                         return null;
1023                 };
1024
1025                 /* Cache document ready status */
1026
1027                 $(document).ready( function() { ready = true; } );
1028         } )();
1029
1030         /** HTML construction helper functions */
1031         this.html = new ( function () {
1032                 var escapeCallback = function( s ) {
1033                         switch ( s ) {
1034                                 case "'":
1035                                         return '&#039;';
1036                                 case '"':
1037                                         return '&quot;';
1038                                 case '<':
1039                                         return '&lt;';
1040                                 case '>':
1041                                         return '&gt;';
1042                                 case '&':
1043                                         return '&amp;';
1044                         }
1045                 };
1046
1047                 /**
1048                  * Escape a string for HTML. Converts special characters to HTML entities.
1049                  * @param s The string to escape
1050                  */
1051                 this.escape = function( s ) {
1052                         return s.replace( /['"<>&]/g, escapeCallback );
1053                 };
1054
1055                 /**
1056                  * Wrapper object for raw HTML passed to mw.html.element().
1057                  */
1058                 this.Raw = function( value ) {
1059                         this.value = value;
1060                 };
1061
1062                 /**
1063                  * Wrapper object for CDATA element contents passed to mw.html.element()
1064                  */
1065                 this.Cdata = function( value ) {
1066                         this.value = value;
1067                 };
1068
1069                 /**
1070                  * Create an HTML element string, with safe escaping.
1071                  *
1072                  * @param name The tag name.
1073                  * @param attrs An object with members mapping element names to values
1074                  * @param contents The contents of the element. May be either:
1075                  *    - string: The string is escaped.
1076                  *    - null or undefined: The short closing form is used, e.g. <br/>.
1077                  *    - this.Raw: The value attribute is included without escaping.
1078                  *    - this.Cdata: The value attribute is included, and an exception is
1079                  *      thrown if it contains an illegal ETAGO delimiter.
1080                  *      See http://www.w3.org/TR/1999/REC-html401-19991224/appendix/notes.html#h-B.3.2
1081                  *
1082                  * Example:
1083                  *    var h = mw.html;
1084                  *    return h.element( 'div', {},
1085                  *        new h.Raw( h.element( 'img', {src: '<'} ) ) );
1086                  * Returns <div><img src="&lt;"/></div>
1087                  */
1088                 this.element = function( name, attrs, contents ) {
1089                         var s = '<' + name;
1090                         for ( var attrName in attrs ) {
1091                                 s += ' ' + attrName + '="' + this.escape( attrs[attrName] ) + '"';
1092                         }
1093                         if ( typeof contents == 'undefined' || contents === null ) {
1094                                 // Self close tag
1095                                 s += '/>';
1096                                 return s;
1097                         }
1098                         // Regular open tag
1099                         s += '>';
1100                         if ( typeof contents === 'string') {
1101                                 // Escaped
1102                                 s += this.escape( contents );
1103                         } else if ( contents instanceof this.Raw ) {
1104                                 // Raw HTML inclusion
1105                                 s += contents.value;
1106                         } else if ( contents instanceof this.Cdata ) {
1107                                 // CDATA
1108                                 if ( /<\/[a-zA-z]/.test( contents.value ) ) {
1109                                         throw new Error( 'mw.html.element: Illegal end tag found in CDATA' );
1110                                 }
1111                                 s += contents.value;
1112                         } else {
1113                                 throw new Error( 'mw.html.element: Invalid type of contents' );
1114                         }
1115                         s += '</' + name + '>';
1116                         return s;
1117                 };
1118         } )();
1119
1120         /* Extension points */
1121
1122         this.legacy = {};
1123
1124 } )( jQuery );
1125
1126 // Alias $j to jQuery for backwards compatibility
1127 window.$j = jQuery;
1128 window.mw = mediaWiki;
1129
1130 /* Auto-register from pre-loaded startup scripts */
1131
1132 if ( $.isFunction( startUp ) ) {
1133         startUp();
1134         delete startUp;
1135 }