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().setTime( timestamp * 1000 );
 363                         return [
 364                                 pad( d.getUTCFullYear(), d.getUTCMonth() + 1, d.getUTCDate() ), 'T',
 365                                 pad( d.getUTCHours(), d.getUTCMinutes(), d.getUTCSeconds() ), 'Z'
 366                         ].join( '' );
 367                 }
 368
 369                 /**
 370                  * Recursively resolves dependencies and detects circular references
 371                  */
 372                 function recurse( module, resolved, unresolved ) {
 373                         if ( registry[module] === undefined ) {
 374                                 throw new Error( 'Unknown dependency: ' + module );
 375                         }
 376                         // Resolves dynamic loader function and replaces it with its own results
 377                         if ( $.isFunction( registry[module].dependencies ) ) {
 378                                 registry[module].dependencies = registry[module].dependencies();
 379                                 // Ensures the module's dependencies are always in an array
 380                                 if ( typeof registry[module].dependencies !== 'object' ) {
 381                                         registry[module].dependencies = [registry[module].dependencies];
 382                                 }
 383                         }
 384                         // Tracks down dependencies
 385                         for ( var n = 0; n < registry[module].dependencies.length; n++ ) {
 386                                 if ( $.inArray( registry[module].dependencies[n], resolved ) === -1 ) {
 387                                         if ( $.inArray( registry[module].dependencies[n], unresolved ) !== -1 ) {
 388                                                 throw new Error(
 389                                                         'Circular reference detected: ' + module +
 390                                                         ' -> ' + registry[module].dependencies[n]
 391                                                 );
 392                                         }
 393                                         recurse( registry[module].dependencies[n], resolved, unresolved );
 394                                 }
 395                         }
 396                         resolved[resolved.length] = module;
 397                         unresolved.splice( $.inArray( module, unresolved ), 1 );
 398                 }
 399
 400                 /**
 401                  * Gets a list of module names that a module depends on in their proper dependency order
 402                  *
 403                  * @param module string module name or array of string module names
 404                  * @return list of dependencies
 405                  * @throws Error if circular reference is detected
 406                  */
 407                 function resolve( module ) {
 408                         // Allow calling with an array of module names
 409                         if ( typeof module === 'object' ) {
 410                                 var modules = [];
 411                                 for ( var m = 0; m < module.length; m++ ) {
 412                                         var dependencies = resolve( module[m] );
 413                                         for ( var n = 0; n < dependencies.length; n++ ) {
 414                                                 modules[modules.length] = dependencies[n];
 415                                         }
 416                                 }
 417                                 return modules;
 418                         } else if ( typeof module === 'string' ) {
 419                                 // Undefined modules have no dependencies
 420                                 if ( !( module in registry ) ) {
 421                                         return [];
 422                                 }
 423                                 var resolved = [];
 424                                 recurse( module, resolved, [] );
 425                                 return resolved;
 426                         }
 427                         throw new Error( 'Invalid module argument: ' + module );
 428                 }
 429
 430                 /**
 431                  * Narrows a list of module names down to those matching a specific
 432                  * state. Possible states are 'undefined', 'registered', 'loading',
 433                  * 'loaded', or 'ready'
 434                  *
 435                  * @param states string or array of strings of module states to filter by
 436                  * @param modules array list of module names to filter (optional, all modules
 437                  *  will be used by default)
 438                  * @return array list of filtered module names
 439                  */
 440                 function filter( states, modules ) {
 441                         // Allow states to be given as a string
 442                         if ( typeof states === 'string' ) {
 443                                 states = [states];
 444                         }
 445                         // If called without a list of modules, build and use a list of all modules
 446                         var list = [], module;
 447                         if ( modules === undefined ) {
 448                                 modules = [];
 449                                 for ( module in registry ) {
 450                                         modules[modules.length] = module;
 451                                 }
 452                         }
 453                         // Build a list of modules which are in one of the specified states
 454                         for ( var s = 0; s < states.length; s++ ) {
 455                                 for ( var m = 0; m < modules.length; m++ ) {
 456                                         if ( registry[modules[m]] === undefined ) {
 457                                                 // Module does not exist
 458                                                 if ( states[s] === 'undefined' ) {
 459                                                         // OK, undefined
 460                                                         list[list.length] = modules[m];
 461                                                 }
 462                                         } else {
 463                                                 // Module exists, check state
 464                                                 if ( registry[modules[m]].state === states[s] ) {
 465                                                         // OK, correct state
 466                                                         list[list.length] = modules[m];
 467                                                 }
 468                                         }
 469                                 }
 470                         }
 471                         return list;
 472                 }
 473
 474                 /**
 475                  * Executes a loaded module, making it ready to use
 476                  *
 477                  * @param module string module name to execute
 478                  */
 479                 function execute( module, callback ) {
 480                         if ( registry[module] === undefined ) {
 481                                 throw new Error( 'Module has not been registered yet: ' + module );
 482                         } else if ( registry[module].state === 'registered' ) {
 483                                 throw new Error( 'Module has not been requested from the server yet: ' + module );
 484                         } else if ( registry[module].state === 'loading' ) {
 485                                 throw new Error( 'Module has not completed loading yet: ' + module );
 486                         } else if ( registry[module].state === 'ready' ) {
 487                                 throw new Error( 'Module has already been loaded: ' + module );
 488                         }
 489                         // Add styles
 490                         var style;
 491                         if ( $.isPlainObject( registry[module].style ) ) {
 492                                 for ( var media in registry[module].style ) {
 493                                         style = registry[module].style[media];
 494                                         if ( $.isArray( style ) ) {
 495                                                 for ( var i = 0; i < style.length; i++ ) {
 496                                                         getMarker().before( mw.html.element( 'link', {
 497                                                                 'type': 'text/css',
 498                                                                 'rel': 'stylesheet',
 499                                                                 'href': style[i]
 500                                                         } ) );
 501                                                 }
 502                                         } else if ( typeof style === 'string' ) {
 503                                                 getMarker().before( mw.html.element(
 504                                                         'style',
 505                                                         { 'type': 'text/css', 'media': media },
 506                                                         new mw.html.Cdata( style )
 507                                                 ) );
 508                                         }
 509                                 }
 510                         }
 511                         // Add localizations to message system
 512                         if ( $.isPlainObject( registry[module].messages ) ) {
 513                                 mw.messages.set( registry[module].messages );
 514                         }
 515                         // Execute script
 516                         try {
 517                                 var     script = registry[module].script,
 518                                         markModuleReady = function() {
 519                                                 registry[module].state = 'ready';
 520                                                 handlePending( module );
 521                                                 if ( $.isFunction( callback ) ) {
 522                                                         callback();
 523                                                 }
 524                                         };
 525
 526                                 if ( $.isArray( script ) ) {
 527                                         var done = 0;
 528                                         if ( script.length === 0 ) {
 529                                                 // No scripts in this module? Let's dive out early.
 530                                                 markModuleReady();
 531                                         }
 532                                         for ( var i = 0; i < script.length; i++ ) {
 533                                                 registry[module].state = 'loading';
 534                                                 addScript( script[i], function() {
 535                                                         if ( ++done === script.length ) {
 536                                                                 markModuleReady();
 537                                                         }
 538                                                 } );
 539                                         }
 540                                 } else if ( $.isFunction( script ) ) {
 541                                         script( jQuery );
 542                                         markModuleReady();
 543                                 }
 544                         } catch ( e ) {
 545                                 // This needs to NOT use mw.log because these errors are common in production mode
 546                                 // and not in debug mode, such as when a symbol that should be global isn't exported
 547                                 if ( window.console && typeof window.console.log === 'function' ) {
 548                                         console.log( 'mw.loader::execute> Exception thrown by ' + module + ': ' + e.message );
 549                                 }
 550                                 registry[module].state = 'error';
 551                                 throw e;
 552                         }
 553                 }
 554
 555                 /**
 556                  * Automatically executes jobs and modules which are pending with satistifed dependencies.
 557                  *
 558                  * This is used when dependencies are satisfied, such as when a module is executed.
 559                  */
 560                 function handlePending( module ) {
 561                         try {
 562                                 // Run jobs who's dependencies have just been met
 563                                 for ( var j = 0; j < jobs.length; j++ ) {
 564                                         if ( compare(
 565                                                 filter( 'ready', jobs[j].dependencies ),
 566                                                 jobs[j].dependencies ) )
 567                                         {
 568                                                 if ( $.isFunction( jobs[j].ready ) ) {
 569                                                         jobs[j].ready();
 570                                                 }
 571                                                 jobs.splice( j, 1 );
 572                                                 j--;
 573                                         }
 574                                 }
 575                                 // Execute modules who's dependencies have just been met
 576                                 for ( var r in registry ) {
 577                                         if ( registry[r].state === 'loaded' ) {
 578                                                 if ( compare(
 579                                                         filter( ['ready'], registry[r].dependencies ),
 580                                                         registry[r].dependencies ) )
 581                                                 {
 582                                                         execute( r );
 583                                                 }
 584                                         }
 585                                 }
 586                         } catch ( e ) {
 587                                 // Run error callbacks of jobs affected by this condition
 588                                 for ( var j = 0; j < jobs.length; j++ ) {
 589                                         if ( $.inArray( module, jobs[j].dependencies ) !== -1 ) {
 590                                                 if ( $.isFunction( jobs[j].error ) ) {
 591                                                         jobs[j].error();
 592                                                 }
 593                                                 jobs.splice( j, 1 );
 594                                                 j--;
 595                                         }
 596                                 }
 597                         }
 598                 }
 599
 600                 /**
 601                  * Adds a dependencies to the queue with optional callbacks to be run
 602                  * when the dependencies are ready or fail
 603                  *
 604                  * @param dependencies string module name or array of string module names
 605                  * @param ready function callback to execute when all dependencies are ready
 606                  * @param error function callback to execute when any dependency fails
 607                  */
 608                 function request( dependencies, ready, error ) {
 609                         // Allow calling by single module name
 610                         if ( typeof dependencies === 'string' ) {
 611                                 dependencies = [dependencies];
 612                                 if ( dependencies[0] in registry ) {
 613                                         for ( var n = 0; n < registry[dependencies[0]].dependencies.length; n++ ) {
 614                                                 dependencies[dependencies.length] = registry[dependencies[0]].dependencies[n];
 615                                         }
 616                                 }
 617                         }
 618                         // Add ready and error callbacks if they were given
 619                         if ( arguments.length > 1 ) {
 620                                 jobs[jobs.length] = {
 621                                         'dependencies': filter(
 622                                                 ['undefined', 'registered', 'loading', 'loaded'],
 623                                                 dependencies
 624                                         ),
 625                                         'ready': ready,
 626                                         'error': error
 627                                 };
 628                         }
 629                         // Queue up any dependencies that are undefined or registered
 630                         dependencies = filter( ['undefined', 'registered'], dependencies );
 631                         for ( var n = 0; n < dependencies.length; n++ ) {
 632                                 if ( $.inArray( dependencies[n], queue ) === -1 ) {
 633                                         queue[queue.length] = dependencies[n];
 634                                 }
 635                         }
 636                         // Work the queue
 637                         mw.loader.work();
 638                 }
 639
 640                 function sortQuery(o) {
 641                         var sorted = {}, key, a = [];
 642                         for ( key in o ) {
 643                                 if ( o.hasOwnProperty( key ) ) {
 644                                         a.push( key );
 645                                 }
 646                         }
 647                         a.sort();
 648                         for ( key = 0; key < a.length; key++ ) {
 649                                 sorted[a[key]] = o[a[key]];
 650                         }
 651                         return sorted;
 652                 }
 653
 654                 /**
 655                  * Converts a module map of the form { foo: [ 'bar', 'baz' ], bar: [ 'baz, 'quux' ] }
 656                  * to a query string of the form foo.bar,baz|bar.baz,quux
 657                  */
 658                 function buildModulesString( moduleMap ) {
 659                         var arr = [], p;
 660                         for ( var prefix in moduleMap ) {
 661                                 p = prefix === '' ? '' : prefix + '.';
 662                                 arr.push( p + moduleMap[prefix].join( ',' ) );
 663                         }
 664                         return arr.join( '|' );
 665                 }
 666
 667                 /**
 668                  * Adds a script tag to the body, either using document.write or low-level DOM manipulation,
 669                  * depending on whether document-ready has occured yet.
 670                  *
 671                  * @param src String: URL to script, will be used as the src attribute in the script tag
 672                  * @param callback Function: Optional callback which will be run when the script is done
 673                  */
 674                 function addScript( src, callback ) {
 675                         if ( ready ) {
 676                                 // jQuery's getScript method is NOT better than doing this the old-fassioned way
 677                                 // because jQuery will eval the script's code, and errors will not have sane
 678                                 // line numbers.
 679                                 var     done = false,
 680                                         script = document.createElement( 'script' );
 681                                 script.setAttribute( 'src', src );
 682                                 script.setAttribute( 'type', 'text/javascript' );
 683                                 if ( $.isFunction( callback ) ) {
 684                                         // Attach handlers for all browsers -- this is based on jQuery.getScript
 685                                         script.onload = script.onreadystatechange = function() {
 686                                                 if (
 687                                                         !done
 688                                                         && (
 689                                                                 !this.readyState
 690                                                                 || this.readyState === 'loaded'
 691                                                                 || this.readyState === 'complete'
 692                                                         )
 693                                                 ) {
 694                                                         done = true;
 695                                                         callback();
 696                                                         // Handle memory leak in IE
 697                                                         script.onload = script.onreadystatechange = null;
 698                                                         if ( script.parentNode ) {
 699                                                                 script.parentNode.removeChild( script );
 700                                                         }
 701                                                 }
 702                                         };
 703                                 }
 704                                 document.body.appendChild( script );
 705                         } else {
 706                                 document.write( mw.html.element(
 707                                         'script', { 'type': 'text/javascript', 'src': src }, ''
 708                                 ) );
 709                                 if ( $.isFunction( callback ) ) {
 710                                         // Document.write is synchronous, so this is called when it's done
 711                                         callback();
 712                                 }
 713                         }
 714                 }
 715
 716                 /* Public Methods */
 717
 718                 /**
 719                  * Requests dependencies from server, loading and executing when things when ready.
 720                  */
 721                 this.work = function() {
 722                                 // Build a list of request parameters
 723                         var     base = {
 724                                         'skin': mw.config.get( 'skin' ),
 725                                         'lang': mw.config.get( 'wgUserLanguage' ),
 726                                         'debug': mw.config.get( 'debug' )
 727                                 },
 728                                 // Extend request parameters with a list of modules in the batch
 729                                 requests = [],
 730                                 // Split into groups
 731                                 groups = {};
 732
 733                         // Appends a list of modules to the batch
 734                         for ( var q = 0; q < queue.length; q++ ) {
 735                                 // Only request modules which are undefined or registered
 736                                 if ( !( queue[q] in registry ) || registry[queue[q]].state === 'registered' ) {
 737                                         // Prevent duplicate entries
 738                                         if ( $.inArray( queue[q], batch ) === -1 ) {
 739                                                 batch[batch.length] = queue[q];
 740                                                 // Mark registered modules as loading
 741                                                 if ( queue[q] in registry ) {
 742                                                         registry[queue[q]].state = 'loading';
 743                                                 }
 744                                         }
 745                                 }
 746                         }
 747                         // Early exit if there's nothing to load
 748                         if ( !batch.length ) {
 749                                 return;
 750                         }
 751                         // Clean up the queue
 752                         queue = [];
 753                         // Always order modules alphabetically to help reduce cache
 754                         // misses for otherwise identical content
 755                         batch.sort();
 756                         for ( var b = 0; b < batch.length; b++ ) {
 757                                 var bGroup = registry[batch[b]].group;
 758                                 if ( !( bGroup in groups ) ) {
 759                                         groups[bGroup] = [];
 760                                 }
 761                                 groups[bGroup][groups[bGroup].length] = batch[b];
 762                         }
 763                         for ( var group in groups ) {
 764                                 // Calculate the highest timestamp
 765                                 var version = 0;
 766                                 for ( var g = 0; g < groups[group].length; g++ ) {
 767                                         if ( registry[groups[group][g]].version > version ) {
 768                                                 version = registry[groups[group][g]].version;
 769                                         }
 770                                 }
 771
 772                                 var     reqBase = $.extend( { 'version': formatVersionNumber( version ) }, base ),
 773                                         reqBaseLength = $.param( reqBase ).length,
 774                                         reqs = [],
 775                                         limit = mw.config.get( 'wgResourceLoaderMaxQueryLength', -1 ),
 776                                         // We may need to split up the request to honor the query string length limit,
 777                                         // so build it piece by piece.
 778                                         l = reqBaseLength + 9, // '&modules='.length == 9
 779                                         r = 0;
 780
 781                                 reqs[0] = {}; // { prefix: [ suffixes ] }
 782
 783                                 for ( var i = 0; i < groups[group].length; i++ ) {
 784                                                 // Determine how many bytes this module would add to the query string
 785                                         var     lastDotIndex = groups[group][i].lastIndexOf( '.' ),
 786                                                 // Note that these substr() calls work even if lastDotIndex == -1
 787                                                 prefix = groups[group][i].substr( 0, lastDotIndex ),
 788                                                 suffix = groups[group][i].substr( lastDotIndex + 1 ),
 789                                                 bytesAdded = prefix in reqs[r]
 790                                                         ? suffix.length + 3 // '%2C'.length == 3
 791                                                         : groups[group][i].length + 3; // '%7C'.length == 3
 792
 793                                         // If the request would become too long, create a new one,
 794                                         // but don't create empty requests
 795                                         if ( limit > 0 && !$.isEmptyObject( reqs[r] ) && l + bytesAdded > limit ) {
 796                                                 // This request would become too long, create a new one
 797                                                 r++;
 798                                                 reqs[r] = {};
 799                                                 l = reqBaseLength + 9;
 800                                         }
 801                                         if ( !( prefix in reqs[r] ) ) {
 802                                                 reqs[r][prefix] = [];
 803                                         }
 804                                         reqs[r][prefix].push( suffix );
 805                                         l += bytesAdded;
 806                                 }
 807                                 for ( var r = 0; r < reqs.length; r++ ) {
 808                                         requests[requests.length] = $.extend(
 809                                                 { 'modules': buildModulesString( reqs[r] ) }, reqBase
 810                                         );
 811                                 }
 812                         }
 813                         // Clear the batch - this MUST happen before we append the
 814                         // script element to the body or it's possible that the script
 815                         // will be locally cached, instantly load, and work the batch
 816                         // again, all before we've cleared it causing each request to
 817                         // include modules which are already loaded
 818                         batch = [];
 819                         // Asynchronously append a script tag to the end of the body
 820                         for ( var r = 0; r < requests.length; r++ ) {
 821                                 requests[r] = sortQuery( requests[r] );
 822                                 // Append &* to avoid triggering the IE6 extension check
 823                                 var src = mw.config.get( 'wgLoadScript' ) + '?' + $.param( requests[r] ) + '&*';
 824                                 addScript( src );
 825                         }
 826                 };
 827
 828                 /**
 829                  * Registers a module, letting the system know about it and its
 830                  * dependencies. loader.js files contain calls to this function.
 831                  */
 832                 this.register = function( module, version, dependencies, group ) {
 833                         // Allow multiple registration
 834                         if ( typeof module === 'object' ) {
 835                                 for ( var m = 0; m < module.length; m++ ) {
 836                                         if ( typeof module[m] === 'string' ) {
 837                                                 mw.loader.register( module[m] );
 838                                         } else if ( typeof module[m] === 'object' ) {
 839                                                 mw.loader.register.apply( mw.loader, module[m] );
 840                                         }
 841                                 }
 842                                 return;
 843                         }
 844                         // Validate input
 845                         if ( typeof module !== 'string' ) {
 846                                 throw new Error( 'module must be a string, not a ' + typeof module );
 847                         }
 848                         if ( registry[module] !== undefined ) {
 849                                 throw new Error( 'module already implemented: ' + module );
 850                         }
 851                         // List the module as registered
 852                         registry[module] = {
 853                                 'state': 'registered',
 854                                 'group': typeof group === 'string' ? group : null,
 855                                 'dependencies': [],
 856                                 'version': version !== undefined ? parseInt( version, 10 ) : 0
 857                         };
 858                         if ( typeof dependencies === 'string' ) {
 859                                 // Allow dependencies to be given as a single module name
 860                                 registry[module].dependencies = [dependencies];
 861                         } else if ( typeof dependencies === 'object' || $.isFunction( dependencies ) ) {
 862                                 // Allow dependencies to be given as an array of module names
 863                                 // or a function which returns an array
 864                                 registry[module].dependencies = dependencies;
 865                         }
 866                 };
 867
 868                 /**
 869                  * Implements a module, giving the system a course of action to take
 870                  * upon loading. Results of a request for one or more modules contain
 871                  * calls to this function.
 872                  *
 873                  * All arguments are required.
 874                  *
 875                  * @param module String: Name of module
 876                  * @param script Mixed: Function of module code or String of URL to be used as the src
 877                  *  attribute when adding a script element to the body
 878                  * @param style Object: Object of CSS strings keyed by media-type or Object of lists of URLs
 879                  *  keyed by media-type
 880                  * @param msgs Object: List of key/value pairs to be passed through mw.messages.set
 881                  */
 882                 this.implement = function( module, script, style, msgs ) {
 883                         // Validate input
 884                         if ( typeof module !== 'string' ) {
 885                                 throw new Error( 'module must be a string, not a ' + typeof module );
 886                         }
 887                         if ( !$.isFunction( script ) && !$.isArray( script ) ) {
 888                                 throw new Error( 'script must be a function or an array, not a ' + typeof script );
 889                         }
 890                         if ( !$.isPlainObject( style ) ) {
 891                                 throw new Error( 'style must be an object, not a ' + typeof style );
 892                         }
 893                         if ( !$.isPlainObject( msgs ) ) {
 894                                 throw new Error( 'msgs must be an object, not a ' + typeof msgs );
 895                         }
 896                         // Automatically register module
 897                         if ( registry[module] === undefined ) {
 898                                 mw.loader.register( module );
 899                         }
 900                         // Check for duplicate implementation
 901                         if ( registry[module] !== undefined && registry[module].script !== undefined ) {
 902                                 throw new Error( 'module already implemeneted: ' + module );
 903                         }
 904                         // Mark module as loaded
 905                         registry[module].state = 'loaded';
 906                         // Attach components
 907                         registry[module].script = script;
 908                         registry[module].style = style;
 909                         registry[module].messages = msgs;
 910                         // Execute or queue callback
 911                         if ( compare(
 912                                 filter( ['ready'], registry[module].dependencies ),
 913                                 registry[module].dependencies ) )
 914                         {
 915                                 execute( module );
 916                         } else {
 917                                 request( module );
 918                         }
 919                 };
 920
 921                 /**
 922                  * Executes a function as soon as one or more required modules are ready
 923                  *
 924                  * @param dependencies string or array of strings of modules names the callback
 925                  *  dependencies to be ready before executing
 926                  * @param ready function callback to execute when all dependencies are ready (optional)
 927                  * @param error function callback to execute when if dependencies have a errors (optional)
 928                  */
 929                 this.using = function( dependencies, ready, error ) {
 930                         var tod = typeof dependencies;
 931                         // Validate input
 932                         if ( tod !== 'object' && tod !== 'string' ) {
 933                                 throw new Error( 'dependencies must be a string or an array, not a ' + tod );
 934                         }
 935                         // Allow calling with a single dependency as a string
 936                         if ( tod === 'string' ) {
 937                                 dependencies = [dependencies];
 938                         }
 939                         // Resolve entire dependency map
 940                         dependencies = resolve( dependencies );
 941                         // If all dependencies are met, execute ready immediately
 942                         if ( compare( filter( ['ready'], dependencies ), dependencies ) ) {
 943                                 if ( $.isFunction( ready ) ) {
 944                                         ready();
 945                                 }
 946                         }
 947                         // If any dependencies have errors execute error immediately
 948                         else if ( filter( ['error'], dependencies ).length ) {
 949                                 if ( $.isFunction( error ) ) {
 950                                         error();
 951                                 }
 952                         }
 953                         // Since some dependencies are not yet ready, queue up a request
 954                         else {
 955                                 request( dependencies, ready, error );
 956                         }
 957                 };
 958
 959                 /**
 960                  * Loads an external script or one or more modules for future use
 961                  *
 962                  * @param modules mixed either the name of a module, array of modules,
 963                  *  or a URL of an external script or style
 964                  * @param type string mime-type to use if calling with a URL of an
 965                  *  external script or style; acceptable values are "text/css" and
 966                  *  "text/javascript"; if no type is provided, text/javascript is assumed.
 967                  */
 968                 this.load = function( modules, type ) {
 969                         // Validate input
 970                         if ( typeof modules !== 'object' && typeof modules !== 'string' ) {
 971                                 throw new Error( 'modules must be a string or an array, not a ' + typeof modules );
 972                         }
 973                         // Allow calling with an external script or single dependency as a string
 974                         if ( typeof modules === 'string' ) {
 975                                 // Support adding arbitrary external scripts
 976                                 if ( modules.substr( 0, 7 ) === 'http://' || modules.substr( 0, 8 ) === 'https://' ) {
 977                                         if ( type === 'text/css' ) {
 978                                                 $( 'head' ).append( $( '<link/>', {
 979                                                         rel: 'stylesheet',
 980                                                         type: 'text/css',
 981                                                         href: modules
 982                                                 } ) );
 983                                                 return true;
 984                                         } else if ( type === 'text/javascript' || type === undefined ) {
 985                                                 addScript( modules );
 986                                                 return true;
 987                                         }
 988                                         // Unknown type
 989                                         return false;
 990                                 }
 991                                 // Called with single module
 992                                 modules = [modules];
 993                         }
 994                         // Resolve entire dependency map
 995                         modules = resolve( modules );
 996                         // If all modules are ready, nothing dependency be done
 997                         if ( compare( filter( ['ready'], modules ), modules ) ) {
 998                                 return true;
 999                         }
1000                         // If any modules have errors return false
1001                         else if ( filter( ['error'], modules ).length ) {
1002                                 return false;
1003                         }
1004                         // Since some modules are not yet ready, queue up a request
1005                         else {
1006                                 request( modules );
1007                                 return true;
1008                         }
1009                 };
1010
1011                 /**
1012                  * Changes the state of a module
1013                  *
1014                  * @param module string module name or object of module name/state pairs
1015                  * @param state string state name
1016                  */
1017                 this.state = function( module, state ) {
1018                         if ( typeof module === 'object' ) {
1019                                 for ( var m in module ) {
1020                                         mw.loader.state( m, module[m] );
1021                                 }
1022                                 return;
1023                         }
1024                         if ( !( module in registry ) ) {
1025                                 mw.loader.register( module );
1026                         }
1027                         registry[module].state = state;
1028                 };
1029
1030                 /**
1031                  * Gets the version of a module
1032                  *
1033                  * @param module string name of module to get version for
1034                  */
1035                 this.getVersion = function( module ) {
1036                         if ( module in registry && 'version' in registry[module] ) {
1037                                 return formatVersionNumber( registry[module].version );
1038                         }
1039                         return null;
1040                 };
1041
1042                 /**
1043                 * @deprecated use mw.loader.getVersion() instead
1044                 */
1045                 this.version = function() {
1046                         return mw.loader.getVersion.apply( mw.loader, arguments );
1047                 };
1048
1049                 /**
1050                  * Gets the state of a module
1051                  *
1052                  * @param module string name of module to get state for
1053                  */
1054                 this.getState = function( module ) {
1055                         if ( module in registry && 'state' in registry[module] ) {
1056                                 return registry[module].state;
1057                         }
1058                         return null;
1059                 };
1060
1061                 /* Cache document ready status */
1062
1063                 $(document).ready( function() { ready = true; } );
1064         } )();
1065
1066         /** HTML construction helper functions */
1067         this.html = new ( function () {
1068                 var escapeCallback = function( s ) {
1069                         switch ( s ) {
1070                                 case "'":
1071                                         return '&#039;';
1072                                 case '"':
1073                                         return '&quot;';
1074                                 case '<':
1075                                         return '&lt;';
1076                                 case '>':
1077                                         return '&gt;';
1078                                 case '&':
1079                                         return '&amp;';
1080                         }
1081                 };
1082
1083                 /**
1084                  * Escape a string for HTML. Converts special characters to HTML entities.
1085                  * @param s The string to escape
1086                  */
1087                 this.escape = function( s ) {
1088                         return s.replace( /['"<>&]/g, escapeCallback );
1089                 };
1090
1091                 /**
1092                  * Wrapper object for raw HTML passed to mw.html.element().
1093                  */
1094                 this.Raw = function( value ) {
1095                         this.value = value;
1096                 };
1097
1098                 /**
1099                  * Wrapper object for CDATA element contents passed to mw.html.element()
1100                  */
1101                 this.Cdata = function( value ) {
1102                         this.value = value;
1103                 };
1104
1105                 /**
1106                  * Create an HTML element string, with safe escaping.
1107                  *
1108                  * @param name The tag name.
1109                  * @param attrs An object with members mapping element names to values
1110                  * @param contents The contents of the element. May be either:
1111                  *  - string: The string is escaped.
1112                  *  - null or undefined: The short closing form is used, e.g. <br/>.
1113                  *  - this.Raw: The value attribute is included without escaping.
1114                  *  - this.Cdata: The value attribute is included, and an exception is
1115                  *   thrown if it contains an illegal ETAGO delimiter.
1116                  *   See http://www.w3.org/TR/1999/REC-html401-19991224/appendix/notes.html#h-B.3.2
1117                  *
1118                  * Example:
1119                  *      var h = mw.html;
1120                  *      return h.element( 'div', {},
1121                  *              new h.Raw( h.element( 'img', {src: '<'} ) ) );
1122                  * Returns <div><img src="&lt;"/></div>
1123                  */
1124                 this.element = function( name, attrs, contents ) {
1125                         var s = '<' + name;
1126                         for ( var attrName in attrs ) {
1127                                 s += ' ' + attrName + '="' + this.escape( attrs[attrName] ) + '"';
1128                         }
1129                         if ( contents === undefined || contents === null ) {
1130                                 // Self close tag
1131                                 s += '/>';
1132                                 return s;
1133                         }
1134                         // Regular open tag
1135                         s += '>';
1136                         if ( typeof contents === 'string' ) {
1137                                 // Escaped
1138                                 s += this.escape( contents );
1139                         } else if ( contents instanceof this.Raw ) {
1140                                 // Raw HTML inclusion
1141                                 s += contents.value;
1142                         } else if ( contents instanceof this.Cdata ) {
1143                                 // CDATA
1144                                 if ( /<\/[a-zA-z]/.test( contents.value ) ) {
1145                                         throw new Error( 'mw.html.element: Illegal end tag found in CDATA' );
1146                                 }
1147                                 s += contents.value;
1148                         } else {
1149                                 throw new Error( 'mw.html.element: Invalid type of contents' );
1150                         }
1151                         s += '</' + name + '>';
1152                         return s;
1153                 };
1154         } )();
1155
1156         /* Extension points */
1157
1158         this.legacy = {};
1159
1160 } )( jQuery );
1161
1162 // Alias $j to jQuery for backwards compatibility
1163 window.$j = jQuery;
1164
1165 /* Auto-register from pre-loaded startup scripts */
1166
1167 if ( jQuery.isFunction( startUp ) ) {
1168         startUp();
1169         delete startUp;
1170 }