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