resources/mediawiki/mediawiki.js

   1 /*
   2  * JavaScript backwards-compatibility alternatives and other convenience functions
   3  */
   4
   5 jQuery.extend({
   6         trimLeft : function( str ) {
   7                 return str == null ? '' : str.toString().replace( /^\s+/, '' );
   8         },
   9         trimRight : function( str ) {
  10                 return str == null ?
  11                                 '' : str.toString().replace( /\s+$/, '' );
  12         },
  13         ucFirst : function( str ) {
  14                 return str.substr( 0, 1 ).toUpperCase() + str.substr( 1, str.length );
  15         },
  16         escapeRE : function( str ) {
  17                 return str.replace ( /([\\{}()|.?*+^$\[\]])/g, "\\$1" );
  18         },
  19         isEmpty : function( v ) {
  20                 var key;
  21                 if ( v === "" || v === 0 || v === "0" || v === null
  22                         || v === false || typeof v === 'undefined' )
  23                 {
  24                         return true;
  25                 }
  26                 // the for-loop could potentially contain prototypes
  27                 // to avoid that we check it's length first
  28                 if ( v.length === 0 ) {
  29                         return true;
  30                 }
  31                 if ( typeof v === 'object' ) {
  32                         for ( key in v ) {
  33                                 return false;
  34                         }
  35                         return true;
  36                 }
  37                 return false;
  38         },
  39         compareArray : function( arrThis, arrAgainst ) {
  40                 if ( arrThis.length != arrAgainst.length ) {
  41                         return false;
  42                 }
  43                 for ( var i = 0; i < arrThis.length; i++ ) {
  44                         if ( arrThis[i] instanceof Array ) {
  45                                 if ( !$.compareArray( arrThis[i], arrAgainst[i] ) ) {
  46                                         return false;
  47                                 }
  48                         } else if ( arrThis[i] !== arrAgainst[i] ) {
  49                                 return false;
  50                         }
  51                 }
  52                 return true;
  53         },
  54         compareObject : function( objectA, objectB ) {
  55
  56                 // Do a simple check if the types match
  57                 if ( typeof( objectA ) == typeof( objectB ) ) {
  58
  59                         // Only loop over the contents if it really is an object
  60                         if ( typeof( objectA ) == 'object' ) {
  61                                 // If they are aliases of the same object (ie. mw and mediaWiki) return now
  62                                 if ( objectA === objectB ) {
  63                                         return true;
  64                                 } else {
  65                                         // Iterate over each property
  66                                         for ( var prop in objectA ) {
  67                                                 // Check if this property is also present in the other object
  68                                                 if ( prop in objectB ) {
  69                                                         // Compare the types of the properties
  70                                                         var type = typeof( objectA[prop] );
  71                                                         if ( type == typeof( objectB[prop] ) ) {
  72                                                                 // Recursively check objects inside this one
  73                                                                 switch ( type ) {
  74                                                                         case 'object' :
  75                                                                                 if ( !$.compareObject( objectA[prop], objectB[prop] ) ) {
  76                                                                                         return false;
  77                                                                                 }
  78                                                                                 break;
  79                                                                         case 'function' :
  80                                                                                 // Functions need to be strings to compare them properly
  81                                                                                 if ( objectA[prop].toString() !== objectB[prop].toString() ) {
  82                                                                                         return false;
  83                                                                                 }
  84                                                                                 break;
  85                                                                         default:
  86                                                                                 // Strings, numbers
  87                                                                                 if ( objectA[prop] !== objectB[prop] ) {
  88                                                                                         return false;
  89                                                                                 }
  90                                                                                 break;
  91                                                                 }
  92                                                         } else {
  93                                                                 return false;
  94                                                         }
  95                                                 } else {
  96                                                         return false;
  97                                                 }
  98                                         }
  99                                         // Check for properties in B but not in A
 100                                         // This is about 15% faster (tested in Safari 5 and Firefox 3.6)
 101                                         // ...than incrementing a count variable in the above and below loops
 102                                         // See also: http://www.mediawiki.org/wiki/ResourceLoader/Default_modules/compareObject_test#Results
 103                                         for ( var prop in objectB ) {
 104                                                 if ( !( prop in objectA ) ) {
 105                                                         return false;
 106                                                 }
 107                                         }
 108                                 }
 109                         }
 110                 } else {
 111                         return false;
 112                 }
 113                 return true;
 114         }
 115 });
 116
 117 /*
 118  * Core MediaWiki JavaScript Library
 119  */
 120
 121 // Attach to window
 122 window.mediaWiki = new ( function( $ ) {
 123
 124         /* Constants */
 125
 126         // This will not change until we are 100% ready to turn off legacy globals
 127         var LEGACY_GLOBALS = true;
 128
 129         /* Private Members */
 130
 131         // List of messages that have been requested to be loaded
 132         var messageQueue = {};
 133
 134         /* Prototypes */
 135
 136         /**
 137          * An object which allows single and multiple get/set/exists functionality
 138          * on a list of key / value pairs.
 139          *
 140          * @param {boolean} global Whether to get/set/exists values on the window
 141          *   object or a private object
 142          */
 143         function Map( global ) {
 144                 this.values = ( global === true ) ? window : {};
 145         }
 146
 147         /**
 148          * Gets the value of a key, or a list of key/value pairs for an array of keys.
 149          *
 150          * If called with no arguments, all values will be returned.
 151          *
 152          * @param selection mixed Key or array of keys to get values for
 153          * @param fallback mixed Value to use in case key(s) do not exist (optional)
 154          */
 155         Map.prototype.get = function( selection, fallback ) {
 156                 if ( typeof selection === 'object' ) {
 157                         selection = $.makeArray( selection );
 158                         var results = {};
 159                         for ( var i = 0; i < selection.length; i++ ) {
 160                                 results[selection[i]] = this.get( selection[i], fallback );
 161                         }
 162                         return results;
 163                 } else if ( typeof selection === 'string' ) {
 164                         if ( typeof this.values[selection] === 'undefined' ) {
 165                                 if ( typeof fallback !== 'undefined' ) {
 166                                         return fallback;
 167                                 }
 168                                 return null;
 169                         }
 170                         return this.values[selection];
 171                 }
 172                 return this.values;
 173         };
 174
 175         /**
 176          * Sets one or multiple key/value pairs.
 177          *
 178          * @param selection mixed Key or object of key/value pairs to set
 179          * @param value mixed Value to set (optional, only in use when key is a string)
 180          */
 181         Map.prototype.set = function( selection, value ) {
 182                 if ( typeof selection === 'object' ) {
 183                         for ( var s in selection ) {
 184                                 this.values[s] = selection[s];
 185                         }
 186                 } else if ( typeof selection === 'string' && typeof value !== 'undefined' ) {
 187                         this.values[selection] = value;
 188                 }
 189         };
 190
 191         /**
 192          * Checks if one or multiple keys exist.
 193          *
 194          * @param selection mixed Key or array of keys to check
 195          * @return boolean Existence of key(s)
 196          */
 197         Map.prototype.exists = function( selection ) {
 198                 if ( typeof keys === 'object' ) {
 199                         for ( var s = 0; s < selection.length; s++ ) {
 200                                 if ( !( selection[s] in this.values ) ) {
 201                                         return false;
 202                                 }
 203                         }
 204                         return true;
 205                 } else {
 206                         return selection in this.values;
 207                 }
 208         };
 209
 210         /**
 211          * Message object, similar to Message in PHP
 212          */
 213         function Message( map, key, parameters ) {
 214                 this.format = 'parse';
 215                 this.map = map;
 216                 this.key = key;
 217                 this.parameters = typeof parameters === 'undefined' ? [] : $.makeArray( parameters );
 218         }
 219
 220         /**
 221          * Appends parameters for replacement
 222          *
 223          * @param parameters mixed First in a list of variadic arguments to append as message parameters
 224          */
 225         Message.prototype.params = function( parameters ) {
 226                 for ( var i = 0; i < parameters.length; i++ ) {
 227                         this.parameters[this.parameters.length] = parameters[i];
 228                 }
 229                 return this;
 230         };
 231
 232         /**
 233          * Converts message object to it's string form based on the state of format
 234          *
 235          * @return {string} String form of message
 236          */
 237         Message.prototype.toString = function() {
 238                 if ( !this.map.exists( this.key ) ) {
 239                         // Return <key> if key does not exist
 240                         return '<' + this.key + '>';
 241                 }
 242                 var text = this.map.get( this.key );
 243                 var parameters = this.parameters;
 244                 text = text.replace( /\$(\d+)/g, function( string, match ) {
 245                         var index = parseInt( match, 10 ) - 1;
 246                         return index in parameters ? parameters[index] : '$' + match;
 247                 } );
 248                 /* This should be fixed up when we have a parser
 249                 if ( this.format === 'parse' && 'language' in mediaWiki ) {
 250                         text = mediaWiki.language.parse( text );
 251                 }
 252                 */
 253                 return text;
 254         };
 255
 256         /**
 257          * Changes format to parse and converts message to string
 258          *
 259          * @return {string} String form of parsed message
 260          */
 261         Message.prototype.parse = function() {
 262                 this.format = 'parse';
 263                 return this.toString();
 264         };
 265
 266         /**
 267          * Changes format to plain and converts message to string
 268          *
 269          * @return {string} String form of plain message
 270          */
 271         Message.prototype.plain = function() {
 272                 this.format = 'plain';
 273                 return this.toString();
 274         };
 275
 276         /**
 277          * Checks if message exists
 278          *
 279          * @return {string} String form of parsed message
 280          */
 281         Message.prototype.exists = function() {
 282                 return this.map.exists( this.key );
 283         };
 284
 285         /**
 286          * User object
 287          */
 288         function User() {
 289
 290                 /* Private Members */
 291
 292                 var that = this;
 293
 294                 /* Public Members */
 295
 296                 this.options = new Map();
 297
 298                 /* Public Methods */
 299
 300                 /**
 301                  * Generates a random user session ID (32 alpha-numeric characters).
 302                  *
 303                  * This information would potentially be stored in a cookie to identify a user during a
 304                  * session or series of sessions. It's uniqueness should not be depended on.
 305                  *
 306                  * @return string random set of 32 alpha-numeric characters
 307                  */
 308                 function generateId() {
 309                         var id = '';
 310                         var seed = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz';
 311                         for ( var i = 0, r; i < 32; i++ ) {
 312                                 r = Math.floor( Math.random() * seed.length );
 313                                 id += seed.substring( r, r + 1 );
 314                         }
 315                         return id;
 316                 }
 317
 318                 /**
 319                  * Gets the current user's name.
 320                  *
 321                  * @return mixed user name string or null if users is anonymous
 322                  */
 323                 this.name = function() {
 324                         return mediaWiki.config.get( 'wgUserName' );
 325                 };
 326
 327                 /**
 328                  * Checks if the current user is anonymous.
 329                  *
 330                  * @return boolean
 331                  */
 332                 this.anonymous = function() {
 333                         return that.name() ? false : true;
 334                 };
 335
 336                 /**
 337                  * Gets a random session ID automatically generated and kept in a cookie.
 338                  *
 339                  * This ID is ephemeral for everyone, staying in their browser only until they close
 340                  * their browser.
 341                  *
 342                  * Do not use this method before the first call to mediaWiki.loader.go(), it depends on
 343                  * jquery.cookie, which is added to the first pay-load just after mediaWiki is defined, but
 344                  * won't be loaded until the first call to go().
 345                  *
 346                  * @return string user name or random session ID
 347                  */
 348                 this.sessionId = function () {
 349                         var sessionId = $.cookie( 'mediaWiki.user.sessionId' );
 350                         if ( typeof sessionId == 'undefined' || sessionId == null ) {
 351                                 sessionId = generateId();
 352                                 $.cookie( 'mediaWiki.user.sessionId', sessionId, { 'expires': null, 'path': '/' } );
 353                         }
 354                         return sessionId;
 355                 };
 356
 357                 /**
 358                  * Gets the current user's name or a random ID automatically generated and kept in a cookie.
 359                  *
 360                  * This ID is persistent for anonymous users, staying in their browser up to 1 year. The
 361                  * expiration time is reset each time the ID is queried, so in most cases this ID will
 362                  * persist until the browser's cookies are cleared or the user doesn't visit for 1 year.
 363                  *
 364                  * Do not use this method before the first call to mediaWiki.loader.go(), it depends on
 365                  * jquery.cookie, which is added to the first pay-load just after mediaWiki is defined, but
 366                  * won't be loaded until the first call to go().
 367                  *
 368                  * @return string user name or random session ID
 369                  */
 370                 this.id = function() {
 371                         var name = that.name();
 372                         if ( name ) {
 373                                 return name;
 374                         }
 375                         var id = $.cookie( 'mediaWiki.user.id' );
 376                         if ( typeof id == 'undefined' || id == null ) {
 377                                 id = generateId();
 378                         }
 379                         // Set cookie if not set, or renew it if already set
 380                         $.cookie( 'mediaWiki.user.id', id, { 'expires': 365, 'path': '/' } );
 381                         return id;
 382                 };
 383         }
 384
 385         /* Public Members */
 386
 387         /*
 388          * Dummy function which in debug mode can be replaced with a function that
 389          * does something clever
 390          */
 391         this.log = function() { };
 392
 393         /*
 394          * Make the Map-class publicly available
 395          */
 396         this.Map = Map;
 397
 398         /*
 399          * List of configuration values
 400          *
 401          * In legacy mode the values this object wraps will be in the global space
 402          */
 403         this.config = new this.Map( LEGACY_GLOBALS );
 404
 405         /*
 406          * Information about the current user
 407          */
 408         this.user = new User();
 409
 410         /*
 411          * Localization system
 412          */
 413         this.messages = new this.Map();
 414
 415         /* Public Methods */
 416
 417         /**
 418          * Gets a message object, similar to wfMessage()
 419          *
 420          * @param key string Key of message to get
 421          * @param parameters mixed First argument in a list of variadic arguments, each a parameter for $
 422          * replacement
 423          */
 424         this.message = function( key, parameters ) {
 425                 // Support variadic arguments
 426                 if ( typeof parameters !== 'undefined' ) {
 427                         parameters = $.makeArray( arguments );
 428                         parameters.shift();
 429                 } else {
 430                         parameters = [];
 431                 }
 432                 return new Message( mediaWiki.messages, key, parameters );
 433         };
 434
 435         /**
 436          * Gets a message string, similar to wfMsg()
 437          *
 438          * @param key string Key of message to get
 439          * @param parameters mixed First argument in a list of variadic arguments, each a parameter for $
 440          * replacement
 441          */
 442         this.msg = function( key, parameters ) {
 443                 return mediaWiki.message.apply( mediaWiki.message, arguments ).toString();
 444         };
 445
 446         /**
 447          * Client-side module loader which integrates with the MediaWiki ResourceLoader
 448          */
 449         this.loader = new ( function() {
 450
 451                 /* Private Members */
 452
 453                 /**
 454                  * Mapping of registered modules
 455                  *
 456                  * The jquery module is pre-registered, because it must have already
 457                  * been provided for this object to have been built, and in debug mode
 458                  * jquery would have been provided through a unique loader request,
 459                  * making it impossible to hold back registration of jquery until after
 460                  * mediawiki.
 461                  *
 462                  * Format:
 463                  *      {
 464                  *              'moduleName': {
 465                  *                      'dependencies': ['required module', 'required module', ...], (or) function() {}
 466                  *                      'state': 'registered', 'loading', 'loaded', 'ready', or 'error'
 467                  *                      'script': function() {},
 468                  *                      'style': 'css code string',
 469                  *                      'messages': { 'key': 'value' },
 470                  *                      'version': ############## (unix timestamp)
 471                  *              }
 472                  *      }
 473                  */
 474                 var registry = {};
 475                 // List of modules which will be loaded as when ready
 476                 var batch = [];
 477                 // List of modules to be loaded
 478                 var queue = [];
 479                 // List of callback functions waiting for modules to be ready to be called
 480                 var jobs = [];
 481                 // Flag indicating that requests should be suspended
 482                 var suspended = true;
 483                 // Flag inidicating that document ready has occured
 484                 var ready = false;
 485                 // Marker element for adding dynamic styles
 486                 var $marker = $( 'head meta[name=ResourceLoaderDynamicStyles]' );
 487
 488                 /* Private Methods */
 489
 490                 function compare( a, b ) {
 491                         if ( a.length != b.length ) {
 492                                 return false;
 493                         }
 494                         for ( var i = 0; i < b.length; i++ ) {
 495                                 if ( $.isArray( a[i] ) ) {
 496                                         if ( !compare( a[i], b[i] ) ) {
 497                                                 return false;
 498                                         }
 499                                 }
 500                                 if ( a[i] !== b[i] ) {
 501                                         return false;
 502                                 }
 503                         }
 504                         return true;
 505                 }
 506
 507                 /**
 508                  * Generates an ISO8601 "basic" string from a UNIX timestamp
 509                  */
 510                 function formatVersionNumber( timestamp ) {
 511                         function pad( a, b, c ) {
 512                                 return [a < 10 ? '0' + a : a, b < 10 ? '0' + b : b, c < 10 ? '0' + c : c].join( '' );
 513                         }
 514                         var d = new Date();
 515                         d.setTime( timestamp * 1000 );
 516                         return [
 517                                 pad( d.getUTCFullYear(), d.getUTCMonth() + 1, d.getUTCDate() ), 'T',
 518                                 pad( d.getUTCHours(), d.getUTCMinutes(), d.getUTCSeconds() ), 'Z'
 519                         ].join( '' );
 520                 }
 521
 522                 /**
 523                  * Recursively resolves dependencies and detects circular references
 524                  */
 525                 function recurse( module, resolved, unresolved ) {
 526                         if ( typeof registry[module] === 'undefined' ) {
 527                                 throw new Error( 'Unknown dependency: ' + module );
 528                         }
 529                         // Resolves dynamic loader function and replaces it with its own results
 530                         if ( typeof registry[module].dependencies === 'function' ) {
 531                                 registry[module].dependencies = registry[module].dependencies();
 532                                 // Ensures the module's dependencies are always in an array
 533                                 if ( typeof registry[module].dependencies !== 'object' ) {
 534                                         registry[module].dependencies = [registry[module].dependencies];
 535                                 }
 536                         }
 537                         // Tracks down dependencies
 538                         for ( var n = 0; n < registry[module].dependencies.length; n++ ) {
 539                                 if ( $.inArray( registry[module].dependencies[n], resolved ) === -1 ) {
 540                                         if ( $.inArray( registry[module].dependencies[n], unresolved ) !== -1 ) {
 541                                                 throw new Error(
 542                                                         'Circular reference detected: ' + module +
 543                                                         ' -> ' + registry[module].dependencies[n]
 544                                                 );
 545                                         }
 546                                         recurse( registry[module].dependencies[n], resolved, unresolved );
 547                                 }
 548                         }
 549                         resolved[resolved.length] = module;
 550                         unresolved.splice( $.inArray( module, unresolved ), 1 );
 551                 }
 552
 553                 /**
 554                  * Gets a list of module names that a module depends on in their proper dependency order
 555                  *
 556                  * @param module string module name or array of string module names
 557                  * @return list of dependencies
 558                  * @throws Error if circular reference is detected
 559                  */
 560                 function resolve( module, resolved, unresolved ) {
 561                         // Allow calling with an array of module names
 562                         if ( typeof module === 'object' ) {
 563                                 var modules = [];
 564                                 for ( var m = 0; m < module.length; m++ ) {
 565                                         var dependencies = resolve( module[m] );
 566                                         for ( var n = 0; n < dependencies.length; n++ ) {
 567                                                 modules[modules.length] = dependencies[n];
 568                                         }
 569                                 }
 570                                 return modules;
 571                         } else if ( typeof module === 'string' ) {
 572                                 // Undefined modules have no dependencies
 573                                 if ( !( module in registry ) ) {
 574                                         return [];
 575                                 }
 576                                 var resolved = [];
 577                                 recurse( module, resolved, [] );
 578                                 return resolved;
 579                         }
 580                         throw new Error( 'Invalid module argument: ' + module );
 581                 }
 582
 583                 /**
 584                  * Narrows a list of module names down to those matching a specific
 585                  * state. Possible states are 'undefined', 'registered', 'loading',
 586                  * 'loaded', or 'ready'
 587                  *
 588                  * @param states string or array of strings of module states to filter by
 589                  * @param modules array list of module names to filter (optional, all modules
 590                  *   will be used by default)
 591                  * @return array list of filtered module names
 592                  */
 593                 function filter( states, modules ) {
 594                         // Allow states to be given as a string
 595                         if ( typeof states === 'string' ) {
 596                                 states = [states];
 597                         }
 598                         // If called without a list of modules, build and use a list of all modules
 599                         var list = [];
 600                         if ( typeof modules === 'undefined' ) {
 601                                 modules = [];
 602                                 for ( module in registry ) {
 603                                         modules[modules.length] = module;
 604                                 }
 605                         }
 606                         // Build a list of modules which are in one of the specified states
 607                         for ( var s = 0; s < states.length; s++ ) {
 608                                 for ( var m = 0; m < modules.length; m++ ) {
 609                                         if ( typeof registry[modules[m]] === 'undefined' ) {
 610                                                 // Module does not exist
 611                                                 if ( states[s] == 'undefined' ) {
 612                                                         // OK, undefined
 613                                                         list[list.length] = modules[m];
 614                                                 }
 615                                         } else {
 616                                                 // Module exists, check state
 617                                                 if ( registry[modules[m]].state === states[s] ) {
 618                                                         // OK, correct state
 619                                                         list[list.length] = modules[m];
 620                                                 }
 621                                         }
 622                                 }
 623                         }
 624                         return list;
 625                 }
 626
 627                 /**
 628                  * Executes a loaded module, making it ready to use
 629                  *
 630                  * @param module string module name to execute
 631                  */
 632                 function execute( module ) {
 633                         if ( typeof registry[module] === 'undefined' ) {
 634                                 throw new Error( 'Module has not been registered yet: ' + module );
 635                         } else if ( registry[module].state === 'registered' ) {
 636                                 throw new Error( 'Module has not been requested from the server yet: ' + module );
 637                         } else if ( registry[module].state === 'loading' ) {
 638                                 throw new Error( 'Module has not completed loading yet: ' + module );
 639                         } else if ( registry[module].state === 'ready' ) {
 640                                 throw new Error( 'Module has already been loaded: ' + module );
 641                         }
 642                         // Add style sheet to document
 643                         if ( typeof registry[module].style === 'string' && registry[module].style.length ) {
 644                                 $marker.before( mediaWiki.html.element( 'style',
 645                                                 { type: 'text/css' },
 646                                                 new mediaWiki.html.Cdata( registry[module].style )
 647                                         ) );
 648                         } else if ( typeof registry[module].style === 'object'
 649                                 && !( registry[module].style instanceof Array ) )
 650                         {
 651                                 for ( var media in registry[module].style ) {
 652                                         $marker.before( mediaWiki.html.element( 'style',
 653                                                 { type: 'text/css', media: media },
 654                                                 new mediaWiki.html.Cdata( registry[module].style[media] )
 655                                         ) );
 656                                 }
 657                         }
 658                         // Add localizations to message system
 659                         if ( typeof registry[module].messages === 'object' ) {
 660                                 mediaWiki.messages.set( registry[module].messages );
 661                         }
 662                         // Execute script
 663                         try {
 664                                 registry[module].script( jQuery, mediaWiki );
 665                                 registry[module].state = 'ready';
 666                                 // Run jobs who's dependencies have just been met
 667                                 for ( var j = 0; j < jobs.length; j++ ) {
 668                                         if ( compare(
 669                                                 filter( 'ready', jobs[j].dependencies ),
 670                                                 jobs[j].dependencies ) )
 671                                         {
 672                                                 if ( typeof jobs[j].ready === 'function' ) {
 673                                                         jobs[j].ready();
 674                                                 }
 675                                                 jobs.splice( j, 1 );
 676                                                 j--;
 677                                         }
 678                                 }
 679                                 // Execute modules who's dependencies have just been met
 680                                 for ( r in registry ) {
 681                                         if ( registry[r].state == 'loaded' ) {
 682                                                 if ( compare(
 683                                                         filter( ['ready'], registry[r].dependencies ),
 684                                                         registry[r].dependencies ) )
 685                                                 {
 686                                                         execute( r );
 687                                                 }
 688                                         }
 689                                 }
 690                         } catch ( e ) {
 691                                 mediaWiki.log( 'Exception thrown by ' + module + ': ' + e.message );
 692                                 mediaWiki.log( e );
 693                                 registry[module].state = 'error';
 694                                 // Run error callbacks of jobs affected by this condition
 695                                 for ( var j = 0; j < jobs.length; j++ ) {
 696                                         if ( $.inArray( module, jobs[j].dependencies ) !== -1 ) {
 697                                                 if ( typeof jobs[j].error === 'function' ) {
 698                                                         jobs[j].error();
 699                                                 }
 700                                                 jobs.splice( j, 1 );
 701                                                 j--;
 702                                         }
 703                                 }
 704                         }
 705                 }
 706
 707                 /**
 708                  * Adds a dependencies to the queue with optional callbacks to be run
 709                  * when the dependencies are ready or fail
 710                  *
 711                  * @param dependencies string module name or array of string module names
 712                  * @param ready function callback to execute when all dependencies are ready
 713                  * @param error function callback to execute when any dependency fails
 714                  */
 715                 function request( dependencies, ready, error ) {
 716                         // Allow calling by single module name
 717                         if ( typeof dependencies === 'string' ) {
 718                                 dependencies = [dependencies];
 719                                 if ( dependencies[0] in registry ) {
 720                                         for ( var n = 0; n < registry[dependencies[0]].dependencies.length; n++ ) {
 721                                                 dependencies[dependencies.length] =
 722                                                         registry[dependencies[0]].dependencies[n];
 723                                         }
 724                                 }
 725                         }
 726                         // Add ready and error callbacks if they were given
 727                         if ( arguments.length > 1 ) {
 728                                 jobs[jobs.length] = {
 729                                         'dependencies': filter(
 730                                                 ['undefined', 'registered', 'loading', 'loaded'],
 731                                                 dependencies ),
 732                                         'ready': ready,
 733                                         'error': error
 734                                 };
 735                         }
 736                         // Queue up any dependencies that are undefined or registered
 737                         dependencies = filter( ['undefined', 'registered'], dependencies );
 738                         for ( var n = 0; n < dependencies.length; n++ ) {
 739                                 if ( $.inArray( dependencies[n], queue ) === -1 ) {
 740                                         queue[queue.length] = dependencies[n];
 741                                 }
 742                         }
 743                         // Work the queue
 744                         mediaWiki.loader.work();
 745                 }
 746
 747                 function sortQuery(o) {
 748                         var sorted = {}, key, a = [];
 749                         for ( key in o ) {
 750                                 if ( o.hasOwnProperty( key ) ) {
 751                                         a.push( key );
 752                                 }
 753                         }
 754                         a.sort();
 755                         for ( key = 0; key < a.length; key++ ) {
 756                                 sorted[a[key]] = o[a[key]];
 757                         }
 758                         return sorted;
 759                 }
 760
 761                 /* Public Methods */
 762
 763                 /**
 764                  * Requests dependencies from server, loading and executing when things when ready.
 765                  */
 766                 this.work = function() {
 767                         // Appends a list of modules to the batch
 768                         for ( var q = 0; q < queue.length; q++ ) {
 769                                 // Only request modules which are undefined or registered
 770                                 if ( !( queue[q] in registry ) || registry[queue[q]].state == 'registered' ) {
 771                                         // Prevent duplicate entries
 772                                         if ( $.inArray( queue[q], batch ) === -1 ) {
 773                                                 batch[batch.length] = queue[q];
 774                                                 // Mark registered modules as loading
 775                                                 if ( queue[q] in registry ) {
 776                                                         registry[queue[q]].state = 'loading';
 777                                                 }
 778                                         }
 779                                 }
 780                         }
 781                         // Clean up the queue
 782                         queue = [];
 783                         // After document ready, handle the batch
 784                         if ( !suspended && batch.length ) {
 785                                 // Always order modules alphabetically to help reduce cache
 786                                 // misses for otherwise identical content
 787                                 batch.sort();
 788                                 // Build a list of request parameters
 789                                 var base = {
 790                                         'skin': mediaWiki.config.get( 'skin' ),
 791                                         'lang': mediaWiki.config.get( 'wgUserLanguage' ),
 792                                         'debug': mediaWiki.config.get( 'debug' )
 793                                 };
 794                                 // Extend request parameters with a list of modules in the batch
 795                                 var requests = [];
 796                                 // Split into groups
 797                                 var groups = {};
 798                                 for ( var b = 0; b < batch.length; b++ ) {
 799                                         var group = registry[batch[b]].group;
 800                                         if ( !( group in groups ) ) {
 801                                                 groups[group] = [];
 802                                         }
 803                                         groups[group][groups[group].length] = batch[b];
 804                                 }
 805                                 for ( var group in groups ) {
 806                                         // Calculate the highest timestamp
 807                                         var version = 0;
 808                                         for ( var g = 0; g < groups[group].length; g++ ) {
 809                                                 if ( registry[groups[group][g]].version > version ) {
 810                                                         version = registry[groups[group][g]].version;
 811                                                 }
 812                                         }
 813                                         requests[requests.length] = $.extend(
 814                                                 { 'modules': groups[group].join( '|' ), 'version': formatVersionNumber( version ) }, base
 815                                         );
 816                                 }
 817                                 // Clear the batch - this MUST happen before we append the
 818                                 // script element to the body or it's possible that the script
 819                                 // will be locally cached, instantly load, and work the batch
 820                                 // again, all before we've cleared it causing each request to
 821                                 // include modules which are already loaded
 822                                 batch = [];
 823                                 // Asynchronously append a script tag to the end of the body
 824                                 function request() {
 825                                         var html = '';
 826                                         for ( var r = 0; r < requests.length; r++ ) {
 827                                                 requests[r] = sortQuery( requests[r] );
 828                                                 // Build out the HTML
 829                                                 var src = mediaWiki.config.get( 'wgLoadScript' ) + '?' + $.param( requests[r] );
 830                                                 html += mediaWiki.html.element( 'script',
 831                                                         { type: 'text/javascript', src: src }, '' );
 832                                         }
 833                                         return html;
 834                                 }
 835                                 // Load asynchronously after doumument ready
 836                                 if ( ready ) {
 837                                         setTimeout( function() { $( 'body' ).append( request() ); }, 0 )
 838                                 } else {
 839                                         document.write( request() );
 840                                 }
 841                         }
 842                 };
 843
 844                 /**
 845                  * Registers a module, letting the system know about it and its
 846                  * dependencies. loader.js files contain calls to this function.
 847                  */
 848                 this.register = function( module, version, dependencies, group ) {
 849                         // Allow multiple registration
 850                         if ( typeof module === 'object' ) {
 851                                 for ( var m = 0; m < module.length; m++ ) {
 852                                         if ( typeof module[m] === 'string' ) {
 853                                                 mediaWiki.loader.register( module[m] );
 854                                         } else if ( typeof module[m] === 'object' ) {
 855                                                 mediaWiki.loader.register.apply( mediaWiki.loader, module[m] );
 856                                         }
 857                                 }
 858                                 return;
 859                         }
 860                         // Validate input
 861                         if ( typeof module !== 'string' ) {
 862                                 throw new Error( 'module must be a string, not a ' + typeof module );
 863                         }
 864                         if ( typeof registry[module] !== 'undefined' ) {
 865                                 throw new Error( 'module already implemeneted: ' + module );
 866                         }
 867                         // List the module as registered
 868                         registry[module] = {
 869                                 'state': 'registered',
 870                                 'group': typeof group === 'string' ? group : null,
 871                                 'dependencies': [],
 872                                 'version': typeof version !== 'undefined' ? parseInt( version ) : 0
 873                         };
 874                         if ( typeof dependencies === 'string' ) {
 875                                 // Allow dependencies to be given as a single module name
 876                                 registry[module].dependencies = [dependencies];
 877                         } else if ( typeof dependencies === 'object' || typeof dependencies === 'function' ) {
 878                                 // Allow dependencies to be given as an array of module names
 879                                 // or a function which returns an array
 880                                 registry[module].dependencies = dependencies;
 881                         }
 882                 };
 883
 884                 /**
 885                  * Implements a module, giving the system a course of action to take
 886                  * upon loading. Results of a request for one or more modules contain
 887                  * calls to this function.
 888                  */
 889                 this.implement = function( module, script, style, localization ) {
 890                         // Automatically register module
 891                         if ( typeof registry[module] === 'undefined' ) {
 892                                 mediaWiki.loader.register( module );
 893                         }
 894                         // Validate input
 895                         if ( typeof script !== 'function' ) {
 896                                 throw new Error( 'script must be a function, not a ' + typeof script );
 897                         }
 898                         if ( typeof style !== 'undefined'
 899                                 && typeof style !== 'string'
 900                                 && typeof style !== 'object' )
 901                         {
 902                                 throw new Error( 'style must be a string or object, not a ' + typeof style );
 903                         }
 904                         if ( typeof localization !== 'undefined'
 905                                 && typeof localization !== 'object' )
 906                         {
 907                                 throw new Error( 'localization must be an object, not a ' + typeof localization );
 908                         }
 909                         if ( typeof registry[module] !== 'undefined'
 910                                 && typeof registry[module].script !== 'undefined' )
 911                         {
 912                                 throw new Error( 'module already implemeneted: ' + module );
 913                         }
 914                         // Mark module as loaded
 915                         registry[module].state = 'loaded';
 916                         // Attach components
 917                         registry[module].script = script;
 918                         if ( typeof style === 'string'
 919                                 || typeof style === 'object' && !( style instanceof Array ) )
 920                         {
 921                                 registry[module].style = style;
 922                         }
 923                         if ( typeof localization === 'object' ) {
 924                                 registry[module].messages = localization;
 925                         }
 926                         // Execute or queue callback
 927                         if ( compare(
 928                                 filter( ['ready'], registry[module].dependencies ),
 929                                 registry[module].dependencies ) )
 930                         {
 931                                 execute( module );
 932                         } else {
 933                                 request( module );
 934                         }
 935                 };
 936
 937                 /**
 938                  * Executes a function as soon as one or more required modules are ready
 939                  *
 940                  * @param dependencies string or array of strings of modules names the callback
 941                  *   dependencies to be ready before
 942                  * executing
 943                  * @param ready function callback to execute when all dependencies are ready (optional)
 944                  * @param error function callback to execute when if dependencies have a errors (optional)
 945                  */
 946                 this.using = function( dependencies, ready, error ) {
 947                         // Validate input
 948                         if ( typeof dependencies !== 'object' && typeof dependencies !== 'string' ) {
 949                                 throw new Error( 'dependencies must be a string or an array, not a ' +
 950                                         typeof dependencies )
 951                         }
 952                         // Allow calling with a single dependency as a string
 953                         if ( typeof dependencies === 'string' ) {
 954                                 dependencies = [dependencies];
 955                         }
 956                         // Resolve entire dependency map
 957                         dependencies = resolve( dependencies );
 958                         // If all dependencies are met, execute ready immediately
 959                         if ( compare( filter( ['ready'], dependencies ), dependencies ) ) {
 960                                 if ( typeof ready === 'function' ) {
 961                                         ready();
 962                                 }
 963                         }
 964                         // If any dependencies have errors execute error immediately
 965                         else if ( filter( ['error'], dependencies ).length ) {
 966                                 if ( typeof error === 'function' ) {
 967                                         error();
 968                                 }
 969                         }
 970                         // Since some dependencies are not yet ready, queue up a request
 971                         else {
 972                                 request( dependencies, ready, error );
 973                         }
 974                 };
 975
 976                 /**
 977                  * Loads an external script or one or more modules for future use
 978                  *
 979                  * @param modules mixed either the name of a module, array of modules,
 980                  *   or a URL of an external script or style
 981                  * @param type string mime-type to use if calling with a URL of an
 982                  *   external script or style; acceptable values are "text/css" and
 983                  *   "text/javascript"; if no type is provided, text/javascript is
 984                  *   assumed
 985                  */
 986                 this.load = function( modules, type ) {
 987                         // Validate input
 988                         if ( typeof modules !== 'object' && typeof modules !== 'string' ) {
 989                                 throw new Error( 'dependencies must be a string or an array, not a ' +
 990                                         typeof dependencies )
 991                         }
 992                         // Allow calling with an external script or single dependency as a string
 993                         if ( typeof modules === 'string' ) {
 994                                 // Support adding arbitrary external scripts
 995                                 if ( modules.substr( 0, 7 ) == 'http://'
 996                                         || modules.substr( 0, 8 ) == 'https://' )
 997                                 {
 998                                         if ( type === 'text/css' ) {
 999                                                 $( 'head' )
1000                                                         .append( $( '<link rel="stylesheet" type="text/css" />' )
1001                                                         .attr( 'href', modules ) );
1002                                                 return true;
1003                                         } else if ( type === 'text/javascript' || typeof type === 'undefined' ) {
1004                                                 var script = mediaWiki.html.element( 'script',
1005                                                         { type: 'text/javascript', src: modules }, '' );
1006                                                 if ( ready ) {
1007                                                         $( 'body' ).append( script );
1008                                                 } else {
1009                                                         document.write( script );
1010                                                 }
1011                                                 return true;
1012                                         }
1013                                         // Unknown type
1014                                         return false;
1015                                 }
1016                                 // Called with single module
1017                                 modules = [modules];
1018                         }
1019                         // Resolve entire dependency map
1020                         modules = resolve( modules );
1021                         // If all modules are ready, nothing dependency be done
1022                         if ( compare( filter( ['ready'], modules ), modules ) ) {
1023                                 return true;
1024                         }
1025                         // If any modules have errors return false
1026                         else if ( filter( ['error'], modules ).length ) {
1027                                 return false;
1028                         }
1029                         // Since some modules are not yet ready, queue up a request
1030                         else {
1031                                 request( modules );
1032                                 return true;
1033                         }
1034                 };
1035
1036                 /**
1037                  * Flushes the request queue and begin executing load requests on demand
1038                  */
1039                 this.go = function() {
1040                         suspended = false;
1041                         mediaWiki.loader.work();
1042                 };
1043
1044                 /**
1045                  * Changes the state of a module
1046                  *
1047                  * @param module string module name or object of module name/state pairs
1048                  * @param state string state name
1049                  */
1050                 this.state = function( module, state ) {
1051                         if ( typeof module === 'object' ) {
1052                                 for ( var m in module ) {
1053                                         mediaWiki.loader.state( m, module[m] );
1054                                 }
1055                                 return;
1056                         }
1057                         if ( !( module in registry ) ) {
1058                                 mediaWiki.loader.register( module );
1059                         }
1060                         registry[module].state = state;
1061                 };
1062
1063                 /**
1064                  * Gets the version of a module
1065                  *
1066                  * @param module string name of module to get version for
1067                  */
1068                 this.version = function( module ) {
1069                         if ( module in registry && 'version' in registry[module] ) {
1070                                 return formatVersionNumber( registry[module].version );
1071                         }
1072                         return null;
1073                 };
1074
1075                 /* Cache document ready status */
1076
1077                 $(document).ready( function() { ready = true; } );
1078         } )();
1079
1080         /** HTML construction helper functions */
1081         this.html = new ( function () {
1082                 function escapeCallback( s ) {
1083                         switch ( s ) {
1084                                 case "'":
1085                                         return '&#039;';
1086                                 case '"':
1087                                         return '&quot;';
1088                                 case '<':
1089                                         return '&lt;';
1090                                 case '>':
1091                                         return '&gt;';
1092                                 case '&':
1093                                         return '&amp;';
1094                         }
1095                 }
1096
1097                 /**
1098                  * Escape a string for HTML. Converts special characters to HTML entities.
1099                  * @param s The string to escape
1100                  */
1101                 this.escape = function( s ) {
1102                         return s.replace( /['"<>&]/g, escapeCallback );
1103                 };
1104
1105                 /**
1106                  * Wrapper object for raw HTML passed to mediaWiki.html.element().
1107                  */
1108                 this.Raw = function( value ) {
1109                         this.value = value;
1110                 };
1111
1112                 /**
1113                  * Wrapper object for CDATA element contents passed to mediaWiki.html.element()
1114                  */
1115                 this.Cdata = function( value ) {
1116                         this.value = value;
1117                 };
1118
1119                 /**
1120                  * Create an HTML element string, with safe escaping.
1121                  *
1122                  * @param name The tag name.
1123                  * @param attrs An object with members mapping element names to values
1124                  * @param contents The contents of the element. May be either:
1125                  *    - string: The string is escaped.
1126                  *    - null or undefined: The short closing form is used, e.g. <br/>.
1127                  *    - this.Raw: The value attribute is included without escaping.
1128                  *    - this.Cdata: The value attribute is included, and an exception is
1129                  *      thrown if it contains an illegal ETAGO delimiter.
1130                  *      See http://www.w3.org/TR/1999/REC-html401-19991224/appendix/notes.html#h-B.3.2
1131                  *
1132                  * Example:
1133                  *    var h = mediaWiki.html;
1134                  *    return h.element( 'div', {},
1135                  *        new h.Raw( h.element( 'img', {src: '<'} ) ) );
1136                  * Returns <div><img src="&lt;"/></div>
1137                  */
1138                 this.element = function( name, attrs, contents ) {
1139                         var s = '<' + name;
1140                         for ( attrName in attrs ) {
1141                                 s += ' ' + attrName + '="' + this.escape( attrs[attrName] ) + '"';
1142                         }
1143                         if ( typeof contents == 'undefined' || contents === null ) {
1144                                 // Self close tag
1145                                 s += '/>';
1146                                 return s;
1147                         }
1148                         // Regular open tag
1149                         s += '>';
1150                         if (typeof contents === 'string') {
1151                                 // Escaped
1152                                 s += this.escape( contents );
1153                         } else if ( contents instanceof this.Raw ) {
1154                                 // Raw HTML inclusion
1155                                 s += contents.value;
1156                         } else if ( contents instanceof this.Cdata ) {
1157                                 // CDATA
1158                                 if ( /<\/[a-zA-z]/.test( contents.value ) ) {
1159                                         throw new Error( 'mw.html.element: Illegal end tag found in CDATA' );
1160                                 }
1161                                 s += contents.value;
1162                         } else {
1163                                 throw new Error( 'mw.html.element: Invalid type of contents' );
1164                         }
1165                         s += '</' + name + '>';
1166                         return s;
1167                 };
1168         } )();
1169
1170
1171         /* Extension points */
1172
1173         this.legacy = {};
1174
1175 } )( jQuery );
1176
1177 /* Auto-register from pre-loaded startup scripts */
1178
1179 if ( typeof startUp === 'function' ) {
1180         startUp();
1181         delete startUp;
1182 }
1183
1184 // Add jQuery Cookie to initial payload (used in mediaWiki.user)
1185 mediaWiki.loader.load( 'jquery.cookie' );
1186
1187 // Alias $j to jQuery for backwards compatibility
1188 window.$j = jQuery;
1189 window.mw = mediaWiki;