resources/mediawiki/mediawiki.js

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