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. It's uniqueness should not be depended on.
 305                  *
 306                  * @return string random set of 32 alpha-numeric characters
 307                  */
 308                 function generateSessionId() {
 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                  * Gets the current user's name or a random session ID automatically generated and kept in
 329                  * a cookie.
 330                  *
 331                  * @return string user name or random session ID
 332                  */
 333                 this.sessionId = function () {
 334                         var name = that.name();
 335                         if ( name ) {
 336                                 return name;
 337                         }
 338                         mediaWiki.loader.load( 'jquery.cookie' );
 339                         var sessionId = $.cookie( 'mediaWiki.user.sessionId' );
 340                         if ( typeof sessionId == 'undefined' || sessionId == null ) {
 341                                 sessionId = generateSessionId();
 342                                 $.cookie( 'mediaWiki.user.sessionId', sessionId, { 'expires': 30, 'path': '/' } );
 343                         }
 344                         return sessionId;
 345                 };
 346         }
 347
 348         /* Public Members */
 349
 350         /*
 351          * Dummy function which in debug mode can be replaced with a function that
 352          * does something clever
 353          */
 354         this.log = function() { };
 355
 356         /*
 357          * Make the Map-class publicly available
 358          */
 359         this.Map = Map;
 360
 361         /*
 362          * List of configuration values
 363          *
 364          * In legacy mode the values this object wraps will be in the global space
 365          */
 366         this.config = new this.Map( LEGACY_GLOBALS );
 367
 368         /*
 369          * Information about the current user
 370          */
 371         this.user = new User();
 372
 373         /*
 374          * Localization system
 375          */
 376         this.messages = new this.Map();
 377
 378         /* Public Methods */
 379
 380         /**
 381          * Gets a message object, similar to wfMessage()
 382          *
 383          * @param key string Key of message to get
 384          * @param parameters mixed First argument in a list of variadic arguments, each a parameter for $
 385          * replacement
 386          */
 387         this.message = function( key, parameters ) {
 388                 // Support variadic arguments
 389                 if ( typeof parameters !== 'undefined' ) {
 390                         parameters = $.makeArray( arguments );
 391                         parameters.shift();
 392                 } else {
 393                         parameters = [];
 394                 }
 395                 return new Message( mediaWiki.messages, key, parameters );
 396         };
 397
 398         /**
 399          * Gets a message string, similar to wfMsg()
 400          *
 401          * @param key string Key of message to get
 402          * @param parameters mixed First argument in a list of variadic arguments, each a parameter for $
 403          * replacement
 404          */
 405         this.msg = function( key, parameters ) {
 406                 return mediaWiki.message.apply( mediaWiki.message, arguments ).toString();
 407         };
 408
 409         /**
 410          * Client-side module loader which integrates with the MediaWiki ResourceLoader
 411          */
 412         this.loader = new ( function() {
 413
 414                 /* Private Members */
 415
 416                 /**
 417                  * Mapping of registered modules
 418                  *
 419                  * The jquery module is pre-registered, because it must have already
 420                  * been provided for this object to have been built, and in debug mode
 421                  * jquery would have been provided through a unique loader request,
 422                  * making it impossible to hold back registration of jquery until after
 423                  * mediawiki.
 424                  *
 425                  * Format:
 426                  *      {
 427                  *              'moduleName': {
 428                  *                      'dependencies': ['required module', 'required module', ...], (or) function() {}
 429                  *                      'state': 'registered', 'loading', 'loaded', 'ready', or 'error'
 430                  *                      'script': function() {},
 431                  *                      'style': 'css code string',
 432                  *                      'messages': { 'key': 'value' },
 433                  *                      'version': ############## (unix timestamp)
 434                  *              }
 435                  *      }
 436                  */
 437                 var registry = {};
 438                 // List of modules which will be loaded as when ready
 439                 var batch = [];
 440                 // List of modules to be loaded
 441                 var queue = [];
 442                 // List of callback functions waiting for modules to be ready to be called
 443                 var jobs = [];
 444                 // Flag indicating that requests should be suspended
 445                 var suspended = true;
 446                 // Flag inidicating that document ready has occured
 447                 var ready = false;
 448
 449                 /* Private Methods */
 450
 451                 function compare( a, b ) {
 452                         if ( a.length != b.length ) {
 453                                 return false;
 454                         }
 455                         for ( var i = 0; i < b.length; i++ ) {
 456                                 if ( $.isArray( a[i] ) ) {
 457                                         if ( !compare( a[i], b[i] ) ) {
 458                                                 return false;
 459                                         }
 460                                 }
 461                                 if ( a[i] !== b[i] ) {
 462                                         return false;
 463                                 }
 464                         }
 465                         return true;
 466                 }
 467
 468                 /**
 469                  * Generates an ISO8601 "basic" string from a UNIX timestamp
 470                  */
 471                 function formatVersionNumber( timestamp ) {
 472                         function pad( a, b, c ) {
 473                                 return [a < 10 ? '0' + a : a, b < 10 ? '0' + b : b, c < 10 ? '0' + c : c].join( '' );
 474                         }
 475                         var d = new Date();
 476                         d.setTime( timestamp * 1000 );
 477                         return [
 478                                 pad( d.getUTCFullYear(), d.getUTCMonth() + 1, d.getUTCDate() ), 'T',
 479                                 pad( d.getUTCHours(), d.getUTCMinutes(), d.getUTCSeconds() ), 'Z'
 480                         ].join( '' );
 481                 }
 482
 483                 /**
 484                  * Recursively resolves dependencies and detects circular references
 485                  */
 486                 function recurse( module, resolved, unresolved ) {
 487                         if ( typeof registry[module] === 'undefined' ) {
 488                                 throw new Error( 'Unknown dependency: ' + module );
 489                         }
 490                         // Resolves dynamic loader function and replaces it with its own results
 491                         if ( typeof registry[module].dependencies === 'function' ) {
 492                                 registry[module].dependencies = registry[module].dependencies();
 493                                 // Ensures the module's dependencies are always in an array
 494                                 if ( typeof registry[module].dependencies !== 'object' ) {
 495                                         registry[module].dependencies = [registry[module].dependencies];
 496                                 }
 497                         }
 498                         // Tracks down dependencies
 499                         for ( var n = 0; n < registry[module].dependencies.length; n++ ) {
 500                                 if ( $.inArray( registry[module].dependencies[n], resolved ) === -1 ) {
 501                                         if ( $.inArray( registry[module].dependencies[n], unresolved ) !== -1 ) {
 502                                                 throw new Error(
 503                                                         'Circular reference detected: ' + module +
 504                                                         ' -> ' + registry[module].dependencies[n]
 505                                                 );
 506                                         }
 507                                         recurse( registry[module].dependencies[n], resolved, unresolved );
 508                                 }
 509                         }
 510                         resolved[resolved.length] = module;
 511                         unresolved.splice( $.inArray( module, unresolved ), 1 );
 512                 }
 513
 514                 /**
 515                  * Gets a list of module names that a module depends on in their proper dependency order
 516                  *
 517                  * @param module string module name or array of string module names
 518                  * @return list of dependencies
 519                  * @throws Error if circular reference is detected
 520                  */
 521                 function resolve( module, resolved, unresolved ) {
 522                         // Allow calling with an array of module names
 523                         if ( typeof module === 'object' ) {
 524                                 var modules = [];
 525                                 for ( var m = 0; m < module.length; m++ ) {
 526                                         var dependencies = resolve( module[m] );
 527                                         for ( var n = 0; n < dependencies.length; n++ ) {
 528                                                 modules[modules.length] = dependencies[n];
 529                                         }
 530                                 }
 531                                 return modules;
 532                         } else if ( typeof module === 'string' ) {
 533                                 // Undefined modules have no dependencies
 534                                 if ( !( module in registry ) ) {
 535                                         return [];
 536                                 }
 537                                 var resolved = [];
 538                                 recurse( module, resolved, [] );
 539                                 return resolved;
 540                         }
 541                         throw new Error( 'Invalid module argument: ' + module );
 542                 }
 543
 544                 /**
 545                  * Narrows a list of module names down to those matching a specific
 546                  * state. Possible states are 'undefined', 'registered', 'loading',
 547                  * 'loaded', or 'ready'
 548                  *
 549                  * @param states string or array of strings of module states to filter by
 550                  * @param modules array list of module names to filter (optional, all modules
 551                  *   will be used by default)
 552                  * @return array list of filtered module names
 553                  */
 554                 function filter( states, modules ) {
 555                         // Allow states to be given as a string
 556                         if ( typeof states === 'string' ) {
 557                                 states = [states];
 558                         }
 559                         // If called without a list of modules, build and use a list of all modules
 560                         var list = [];
 561                         if ( typeof modules === 'undefined' ) {
 562                                 modules = [];
 563                                 for ( module in registry ) {
 564                                         modules[modules.length] = module;
 565                                 }
 566                         }
 567                         // Build a list of modules which are in one of the specified states
 568                         for ( var s = 0; s < states.length; s++ ) {
 569                                 for ( var m = 0; m < modules.length; m++ ) {
 570                                         if ( typeof registry[modules[m]] === 'undefined' ) {
 571                                                 // Module does not exist
 572                                                 if ( states[s] == 'undefined' ) {
 573                                                         // OK, undefined
 574                                                         list[list.length] = modules[m];
 575                                                 }
 576                                         } else {
 577                                                 // Module exists, check state
 578                                                 if ( registry[modules[m]].state === states[s] ) {
 579                                                         // OK, correct state
 580                                                         list[list.length] = modules[m];
 581                                                 }
 582                                         }
 583                                 }
 584                         }
 585                         return list;
 586                 }
 587
 588                 /**
 589                  * Executes a loaded module, making it ready to use
 590                  *
 591                  * @param module string module name to execute
 592                  */
 593                 function execute( module ) {
 594                         if ( typeof registry[module] === 'undefined' ) {
 595                                 throw new Error( 'Module has not been registered yet: ' + module );
 596                         } else if ( registry[module].state === 'registered' ) {
 597                                 throw new Error( 'Module has not been requested from the server yet: ' + module );
 598                         } else if ( registry[module].state === 'loading' ) {
 599                                 throw new Error( 'Module has not completed loading yet: ' + module );
 600                         } else if ( registry[module].state === 'ready' ) {
 601                                 throw new Error( 'Module has already been loaded: ' + module );
 602                         }
 603                         // Add style sheet to document
 604                         if ( typeof registry[module].style === 'string' && registry[module].style.length ) {
 605                                 $( 'head' )
 606                                         .append( mediaWiki.html.element( 'style',
 607                                                 { type: "text/css" },
 608                                                 new mediaWiki.html.Cdata( registry[module].style )
 609                                         ) );
 610                         } else if ( typeof registry[module].style === 'object'
 611                                 && !( registry[module].style instanceof Array ) )
 612                         {
 613                                 for ( var media in registry[module].style ) {
 614                                         $( 'head' ).append( mediaWiki.html.element( 'style',
 615                                                 { type: 'text/css', media: media },
 616                                                 new mediaWiki.html.Cdata( registry[module].style[media] )
 617                                         ) );
 618                                 }
 619                         }
 620                         // Add localizations to message system
 621                         if ( typeof registry[module].messages === 'object' ) {
 622                                 mediaWiki.messages.set( registry[module].messages );
 623                         }
 624                         // Execute script
 625                         try {
 626                                 registry[module].script();
 627                                 registry[module].state = 'ready';
 628                                 // Run jobs who's dependencies have just been met
 629                                 for ( var j = 0; j < jobs.length; j++ ) {
 630                                         if ( compare(
 631                                                 filter( 'ready', jobs[j].dependencies ),
 632                                                 jobs[j].dependencies ) )
 633                                         {
 634                                                 if ( typeof jobs[j].ready === 'function' ) {
 635                                                         jobs[j].ready();
 636                                                 }
 637                                                 jobs.splice( j, 1 );
 638                                                 j--;
 639                                         }
 640                                 }
 641                                 // Execute modules who's dependencies have just been met
 642                                 for ( r in registry ) {
 643                                         if ( registry[r].state == 'loaded' ) {
 644                                                 if ( compare(
 645                                                         filter( ['ready'], registry[r].dependencies ),
 646                                                         registry[r].dependencies ) )
 647                                                 {
 648                                                         execute( r );
 649                                                 }
 650                                         }
 651                                 }
 652                         } catch ( e ) {
 653                                 mediaWiki.log( 'Exception thrown by ' + module + ': ' + e.message );
 654                                 mediaWiki.log( e );
 655                                 registry[module].state = 'error';
 656                                 // Run error callbacks of jobs affected by this condition
 657                                 for ( var j = 0; j < jobs.length; j++ ) {
 658                                         if ( $.inArray( module, jobs[j].dependencies ) !== -1 ) {
 659                                                 if ( typeof jobs[j].error === 'function' ) {
 660                                                         jobs[j].error();
 661                                                 }
 662                                                 jobs.splice( j, 1 );
 663                                                 j--;
 664                                         }
 665                                 }
 666                         }
 667                 }
 668
 669                 /**
 670                  * Adds a dependencies to the queue with optional callbacks to be run
 671                  * when the dependencies are ready or fail
 672                  *
 673                  * @param dependencies string module name or array of string module names
 674                  * @param ready function callback to execute when all dependencies are ready
 675                  * @param error function callback to execute when any dependency fails
 676                  */
 677                 function request( dependencies, ready, error ) {
 678                         // Allow calling by single module name
 679                         if ( typeof dependencies === 'string' ) {
 680                                 dependencies = [dependencies];
 681                                 if ( dependencies[0] in registry ) {
 682                                         for ( var n = 0; n < registry[dependencies[0]].dependencies.length; n++ ) {
 683                                                 dependencies[dependencies.length] =
 684                                                         registry[dependencies[0]].dependencies[n];
 685                                         }
 686                                 }
 687                         }
 688                         // Add ready and error callbacks if they were given
 689                         if ( arguments.length > 1 ) {
 690                                 jobs[jobs.length] = {
 691                                         'dependencies': filter(
 692                                                 ['undefined', 'registered', 'loading', 'loaded'],
 693                                                 dependencies ),
 694                                         'ready': ready,
 695                                         'error': error
 696                                 };
 697                         }
 698                         // Queue up any dependencies that are undefined or registered
 699                         dependencies = filter( ['undefined', 'registered'], dependencies );
 700                         for ( var n = 0; n < dependencies.length; n++ ) {
 701                                 if ( $.inArray( dependencies[n], queue ) === -1 ) {
 702                                         queue[queue.length] = dependencies[n];
 703                                 }
 704                         }
 705                         // Work the queue
 706                         mediaWiki.loader.work();
 707                 }
 708
 709                 function sortQuery(o) {
 710                         var sorted = {}, key, a = [];
 711                         for ( key in o ) {
 712                                 if ( o.hasOwnProperty( key ) ) {
 713                                         a.push( key );
 714                                 }
 715                         }
 716                         a.sort();
 717                         for ( key = 0; key < a.length; key++ ) {
 718                                 sorted[a[key]] = o[a[key]];
 719                         }
 720                         return sorted;
 721                 }
 722
 723                 /* Public Methods */
 724
 725                 /**
 726                  * Requests dependencies from server, loading and executing when things when ready.
 727                  */
 728                 this.work = function() {
 729                         // Appends a list of modules to the batch
 730                         for ( var q = 0; q < queue.length; q++ ) {
 731                                 // Only request modules which are undefined or registered
 732                                 if ( !( queue[q] in registry ) || registry[queue[q]].state == 'registered' ) {
 733                                         // Prevent duplicate entries
 734                                         if ( $.inArray( queue[q], batch ) === -1 ) {
 735                                                 batch[batch.length] = queue[q];
 736                                                 // Mark registered modules as loading
 737                                                 if ( queue[q] in registry ) {
 738                                                         registry[queue[q]].state = 'loading';
 739                                                 }
 740                                         }
 741                                 }
 742                         }
 743                         // Clean up the queue
 744                         queue = [];
 745                         // After document ready, handle the batch
 746                         if ( !suspended && batch.length ) {
 747                                 // Always order modules alphabetically to help reduce cache
 748                                 // misses for otherwise identical content
 749                                 batch.sort();
 750                                 // Build a list of request parameters
 751                                 var base = {
 752                                         'skin': mediaWiki.config.get( 'skin' ),
 753                                         'lang': mediaWiki.config.get( 'wgUserLanguage' ),
 754                                         'debug': mediaWiki.config.get( 'debug' )
 755                                 };
 756                                 // Extend request parameters with a list of modules in the batch
 757                                 var requests = [];
 758                                 // Split into groups
 759                                 var groups = {};
 760                                 for ( var b = 0; b < batch.length; b++ ) {
 761                                         var group = registry[batch[b]].group;
 762                                         if ( !( group in groups ) ) {
 763                                                 groups[group] = [];
 764                                         }
 765                                         groups[group][groups[group].length] = batch[b];
 766                                 }
 767                                 for ( var group in groups ) {
 768                                         // Calculate the highest timestamp
 769                                         var version = 0;
 770                                         for ( var g = 0; g < groups[group].length; g++ ) {
 771                                                 if ( registry[groups[group][g]].version > version ) {
 772                                                         version = registry[groups[group][g]].version;
 773                                                 }
 774                                         }
 775                                         requests[requests.length] = $.extend(
 776                                                 { 'modules': groups[group].join( '|' ), 'version': formatVersionNumber( version ) }, base
 777                                         );
 778                                 }
 779                                 // Clear the batch - this MUST happen before we append the
 780                                 // script element to the body or it's possible that the script
 781                                 // will be locally cached, instantly load, and work the batch
 782                                 // again, all before we've cleared it causing each request to
 783                                 // include modules which are already loaded
 784                                 batch = [];
 785                                 // Asynchronously append a script tag to the end of the body
 786                                 function request() {
 787                                         var html = '';
 788                                         for ( var r = 0; r < requests.length; r++ ) {
 789                                                 requests[r] = sortQuery( requests[r] );
 790                                                 // Build out the HTML
 791                                                 var src = mediaWiki.config.get( 'wgLoadScript' ) + '?' + $.param( requests[r] );
 792                                                 html += mediaWiki.html.element( 'script',
 793                                                         { type: 'text/javascript', src: src }, '' );
 794                                         }
 795                                         return html;
 796                                 }
 797                                 // Load asynchronously after doumument ready
 798                                 if ( ready ) {
 799                                         setTimeout( function() { $( 'body' ).append( request() ); }, 0 )
 800                                 } else {
 801                                         document.write( request() );
 802                                 }
 803                         }
 804                 };
 805
 806                 /**
 807                  * Registers a module, letting the system know about it and its
 808                  * dependencies. loader.js files contain calls to this function.
 809                  */
 810                 this.register = function( module, version, dependencies, group ) {
 811                         // Allow multiple registration
 812                         if ( typeof module === 'object' ) {
 813                                 for ( var m = 0; m < module.length; m++ ) {
 814                                         if ( typeof module[m] === 'string' ) {
 815                                                 mediaWiki.loader.register( module[m] );
 816                                         } else if ( typeof module[m] === 'object' ) {
 817                                                 mediaWiki.loader.register.apply( mediaWiki.loader, module[m] );
 818                                         }
 819                                 }
 820                                 return;
 821                         }
 822                         // Validate input
 823                         if ( typeof module !== 'string' ) {
 824                                 throw new Error( 'module must be a string, not a ' + typeof module );
 825                         }
 826                         if ( typeof registry[module] !== 'undefined' ) {
 827                                 throw new Error( 'module already implemeneted: ' + module );
 828                         }
 829                         // List the module as registered
 830                         registry[module] = {
 831                                 'state': 'registered',
 832                                 'group': typeof group === 'string' ? group : null,
 833                                 'dependencies': [],
 834                                 'version': typeof version !== 'undefined' ? parseInt( version ) : 0
 835                         };
 836                         if ( typeof dependencies === 'string' ) {
 837                                 // Allow dependencies to be given as a single module name
 838                                 registry[module].dependencies = [dependencies];
 839                         } else if ( typeof dependencies === 'object' || typeof dependencies === 'function' ) {
 840                                 // Allow dependencies to be given as an array of module names
 841                                 // or a function which returns an array
 842                                 registry[module].dependencies = dependencies;
 843                         }
 844                 };
 845
 846                 /**
 847                  * Implements a module, giving the system a course of action to take
 848                  * upon loading. Results of a request for one or more modules contain
 849                  * calls to this function.
 850                  */
 851                 this.implement = function( module, script, style, localization ) {
 852                         // Automatically register module
 853                         if ( typeof registry[module] === 'undefined' ) {
 854                                 mediaWiki.loader.register( module );
 855                         }
 856                         // Validate input
 857                         if ( typeof script !== 'function' ) {
 858                                 throw new Error( 'script must be a function, not a ' + typeof script );
 859                         }
 860                         if ( typeof style !== 'undefined'
 861                                 && typeof style !== 'string'
 862                                 && typeof style !== 'object' )
 863                         {
 864                                 throw new Error( 'style must be a string or object, not a ' + typeof style );
 865                         }
 866                         if ( typeof localization !== 'undefined'
 867                                 && typeof localization !== 'object' )
 868                         {
 869                                 throw new Error( 'localization must be an object, not a ' + typeof localization );
 870                         }
 871                         if ( typeof registry[module] !== 'undefined'
 872                                 && typeof registry[module].script !== 'undefined' )
 873                         {
 874                                 throw new Error( 'module already implemeneted: ' + module );
 875                         }
 876                         // Mark module as loaded
 877                         registry[module].state = 'loaded';
 878                         // Attach components
 879                         registry[module].script = script;
 880                         if ( typeof style === 'string'
 881                                 || typeof style === 'object' && !( style instanceof Array ) )
 882                         {
 883                                 registry[module].style = style;
 884                         }
 885                         if ( typeof localization === 'object' ) {
 886                                 registry[module].messages = localization;
 887                         }
 888                         // Execute or queue callback
 889                         if ( compare(
 890                                 filter( ['ready'], registry[module].dependencies ),
 891                                 registry[module].dependencies ) )
 892                         {
 893                                 execute( module );
 894                         } else {
 895                                 request( module );
 896                         }
 897                 };
 898
 899                 /**
 900                  * Executes a function as soon as one or more required modules are ready
 901                  *
 902                  * @param dependencies string or array of strings of modules names the callback
 903                  *   dependencies to be ready before
 904                  * executing
 905                  * @param ready function callback to execute when all dependencies are ready (optional)
 906                  * @param error function callback to execute when if dependencies have a errors (optional)
 907                  */
 908                 this.using = function( dependencies, ready, error ) {
 909                         // Validate input
 910                         if ( typeof dependencies !== 'object' && typeof dependencies !== 'string' ) {
 911                                 throw new Error( 'dependencies must be a string or an array, not a ' +
 912                                         typeof dependencies )
 913                         }
 914                         // Allow calling with a single dependency as a string
 915                         if ( typeof dependencies === 'string' ) {
 916                                 dependencies = [dependencies];
 917                         }
 918                         // Resolve entire dependency map
 919                         dependencies = resolve( dependencies );
 920                         // If all dependencies are met, execute ready immediately
 921                         if ( compare( filter( ['ready'], dependencies ), dependencies ) ) {
 922                                 if ( typeof ready === 'function' ) {
 923                                         ready();
 924                                 }
 925                         }
 926                         // If any dependencies have errors execute error immediately
 927                         else if ( filter( ['error'], dependencies ).length ) {
 928                                 if ( typeof error === 'function' ) {
 929                                         error();
 930                                 }
 931                         }
 932                         // Since some dependencies are not yet ready, queue up a request
 933                         else {
 934                                 request( dependencies, ready, error );
 935                         }
 936                 };
 937
 938                 /**
 939                  * Loads an external script or one or more modules for future use
 940                  *
 941                  * @param modules mixed either the name of a module, array of modules,
 942                  *   or a URL of an external script or style
 943                  * @param type string mime-type to use if calling with a URL of an
 944                  *   external script or style; acceptable values are "text/css" and
 945                  *   "text/javascript"; if no type is provided, text/javascript is
 946                  *   assumed
 947                  */
 948                 this.load = function( modules, type ) {
 949                         // Validate input
 950                         if ( typeof modules !== 'object' && typeof modules !== 'string' ) {
 951                                 throw new Error( 'dependencies must be a string or an array, not a ' +
 952                                         typeof dependencies )
 953                         }
 954                         // Allow calling with an external script or single dependency as a string
 955                         if ( typeof modules === 'string' ) {
 956                                 // Support adding arbitrary external scripts
 957                                 if ( modules.substr( 0, 7 ) == 'http://'
 958                                         || modules.substr( 0, 8 ) == 'https://' )
 959                                 {
 960                                         if ( type === 'text/css' ) {
 961                                                 $( 'head' )
 962                                                         .append( $( '<link rel="stylesheet" type="text/css" />' )
 963                                                         .attr( 'href', modules ) );
 964                                                 return true;
 965                                         } else if ( type === 'text/javascript' || typeof type === 'undefined' ) {
 966                                                 var script = mediaWiki.html.element( 'script',
 967                                                         { type: 'text/javascript', src: modules }, '' );
 968                                                 if ( ready ) {
 969                                                         $( 'body' ).append( script );
 970                                                 } else {
 971                                                         document.write( script );
 972                                                 }
 973                                                 return true;
 974                                         }
 975                                         // Unknown type
 976                                         return false;
 977                                 }
 978                                 // Called with single module
 979                                 modules = [modules];
 980                         }
 981                         // Resolve entire dependency map
 982                         modules = resolve( modules );
 983                         // If all modules are ready, nothing dependency be done
 984                         if ( compare( filter( ['ready'], modules ), modules ) ) {
 985                                 return true;
 986                         }
 987                         // If any modules have errors return false
 988                         else if ( filter( ['error'], modules ).length ) {
 989                                 return false;
 990                         }
 991                         // Since some modules are not yet ready, queue up a request
 992                         else {
 993                                 request( modules );
 994                                 return true;
 995                         }
 996                 };
 997
 998                 /**
 999                  * Flushes the request queue and begin executing load requests on demand
1000                  */
1001                 this.go = function() {
1002                         suspended = false;
1003                         mediaWiki.loader.work();
1004                 };
1005
1006                 /**
1007                  * Changes the state of a module
1008                  *
1009                  * @param module string module name or object of module name/state pairs
1010                  * @param state string state name
1011                  */
1012                 this.state = function( module, state ) {
1013                         if ( typeof module === 'object' ) {
1014                                 for ( var m in module ) {
1015                                         mediaWiki.loader.state( m, module[m] );
1016                                 }
1017                                 return;
1018                         }
1019                         if ( !( module in registry ) ) {
1020                                 mediaWiki.loader.register( module );
1021                         }
1022                         registry[module].state = state;
1023                 };
1024
1025                 /**
1026                  * Gets the version of a module
1027                  *
1028                  * @param module string name of module to get version for
1029                  */
1030                 this.version = function( module ) {
1031                         if ( module in registry && 'version' in registry[module] ) {
1032                                 return formatVersionNumber( registry[module].version );
1033                         }
1034                         return null;
1035                 };
1036
1037                 /* Cache document ready status */
1038
1039                 $(document).ready( function() { ready = true; } );
1040         } )();
1041
1042         /** HTML construction helper functions */
1043         this.html = new ( function () {
1044                 function escapeCallback( s ) {
1045                         switch ( s ) {
1046                                 case "'":
1047                                         return '&#039;';
1048                                 case '"':
1049                                         return '&quot;';
1050                                 case '<':
1051                                         return '&lt;';
1052                                 case '>':
1053                                         return '&gt;';
1054                                 case '&':
1055                                         return '&amp;';
1056                         }
1057                 }
1058
1059                 /**
1060                  * Escape a string for HTML. Converts special characters to HTML entities.
1061                  * @param s The string to escape
1062                  */
1063                 this.escape = function( s ) {
1064                         return s.replace( /['"<>&]/g, escapeCallback );
1065                 };
1066
1067                 /**
1068                  * Wrapper object for raw HTML passed to mediaWiki.html.element().
1069                  */
1070                 this.Raw = function( value ) {
1071                         this.value = value;
1072                 };
1073
1074                 /**
1075                  * Wrapper object for CDATA element contents passed to mediaWiki.html.element()
1076                  */
1077                 this.Cdata = function( value ) {
1078                         this.value = value;
1079                 };
1080
1081                 /**
1082                  * Create an HTML element string, with safe escaping.
1083                  *
1084                  * @param name The tag name.
1085                  * @param attrs An object with members mapping element names to values
1086                  * @param contents The contents of the element. May be either:
1087                  *    - string: The string is escaped.
1088                  *    - null or undefined: The short closing form is used, e.g. <br/>.
1089                  *    - this.Raw: The value attribute is included without escaping.
1090                  *    - this.Cdata: The value attribute is included, and an exception is
1091                  *      thrown if it contains an illegal ETAGO delimiter.
1092                  *      See http://www.w3.org/TR/1999/REC-html401-19991224/appendix/notes.html#h-B.3.2
1093                  *
1094                  * Example:
1095                  *    var h = mediaWiki.html;
1096                  *    return h.element( 'div', {},
1097                  *        new h.Raw( h.element( 'img', {src: '<'} ) ) );
1098                  * Returns <div><img src="&lt;"/></div>
1099                  */
1100                 this.element = function( name, attrs, contents ) {
1101                         var s = '<' + name;
1102                         for ( attrName in attrs ) {
1103                                 s += ' ' + attrName + '="' + this.escape( attrs[attrName] ) + '"';
1104                         }
1105                         if ( typeof contents == 'undefined' || contents === null ) {
1106                                 // Self close tag
1107                                 s += '/>';
1108                                 return s;
1109                         }
1110                         // Regular open tag
1111                         s += '>';
1112                         if (typeof contents === 'string') {
1113                                 // Escaped
1114                                 s += this.escape( contents );
1115                         } else if ( contents instanceof this.Raw ) {
1116                                 // Raw HTML inclusion
1117                                 s += contents.value;
1118                         } else if ( contents instanceof this.Cdata ) {
1119                                 // CDATA
1120                                 if ( /<\/[a-zA-z]/.test( contents.value ) ) {
1121                                         throw new Error( 'mw.html.element: Illegal end tag found in CDATA' );
1122                                 }
1123                                 s += contents.value;
1124                         } else {
1125                                 throw new Error( 'mw.html.element: Invalid type of contents' );
1126                         }
1127                         s += '</' + name + '>';
1128                         return s;
1129                 };
1130         } )();
1131
1132
1133         /* Extension points */
1134
1135         this.legacy = {};
1136
1137 } )( jQuery );
1138
1139 /* Auto-register from pre-loaded startup scripts */
1140
1141 if ( typeof startUp === 'function' ) {
1142         startUp();
1143         delete startUp;
1144 }
1145
1146 // Alias $j to jQuery for backwards compatibility
1147 window.$j = jQuery;
1148 window.mw = mediaWiki;