resources/mediawiki/mediawiki.js

   1 /*
   2  * JavaScript backwards-compatibility and support
   3  */
   4
   5 // Make calling .indexOf() on an array work on older browsers
   6 if ( typeof Array.prototype.indexOf === 'undefined' ) {
   7         Array.prototype.indexOf = function( needle ) {
   8                 for ( var i = 0; i < this.length; i++ ) {
   9                         if ( this[i] === needle ) {
  10                                 return i;
  11                         }
  12                 }
  13                 return -1;
  14         };
  15 }
  16 // Add array comparison functionality
  17 if ( typeof Array.prototype.compare === 'undefined' ) {
  18         Array.prototype.compare = function( against ) {
  19                 if ( this.length != against.length ) {
  20                         return false;
  21                 }
  22                 for ( var i = 0; i < against.length; i++ ) {
  23                         if ( this[i].compare ) {
  24                                 if ( !this[i].compare( against[i] ) ) {
  25                                         return false;
  26                                 }
  27                         }
  28                         if ( this[i] !== against[i] ) {
  29                                 return false;
  30                         }
  31                 }
  32                 return true;
  33         };
  34 }
  35
  36 /*
  37  * Core MediaWiki JavaScript Library
  38  */
  39 // Attach to window
  40 window.mediaWiki = new ( function( $ ) {
  41
  42         /* Constants */
  43
  44         // This will not change until we are 100% ready to turn off legacy globals
  45         var LEGACY_GLOBALS = true;
  46
  47         /* Private Members */
  48
  49         var that = this;
  50
  51         /* Prototypes */
  52
  53         this.prototypes = {
  54                 /*
  55                  * An object which allows single and multiple get/set/exists functionality on a list of key / value pairs
  56                  *
  57                  * @param {boolean} global whether to get/set/exists values on the window object or a private object
  58                  * @param {function} parser function to perform extra processing; in the form of function( value, options )
  59                  * where value is the data to be parsed and options is additional data passed through to the parser
  60                  */
  61                 'configuration': function( global, parser ) {
  62
  63                         /* Private Members */
  64
  65                         var that = this;
  66                         var values = global === true ? window : {};
  67
  68                         /* Public Methods */
  69
  70                         /**
  71                          * Gets one or more values
  72                          *
  73                          * If called with no arguments, all values will be returned. If a parser is in use, no parsing will take
  74                          * place when calling with no arguments or calling with an array of names.
  75                          *
  76                          * @param {mixed} selection string name of value to get, array of string names of values to get, or object
  77                          * of name/option pairs
  78                          * @param {object} options optional set of options which are also passed to a parser if in use; only used
  79                          * when selection is a string
  80                          * @format options
  81                          *      {
  82                          *              // Value to use if key does not exist
  83                          *              'fallback': ''
  84                          *      }
  85                          */
  86                         this.get = function( selection, options ) {
  87                                 if ( typeof selection === 'object' ) {
  88                                         var results = {};
  89                                         for ( var s in selection ) {
  90                                                 if ( selection.hasOwnProperty( s ) ) {
  91                                                         if ( typeof s === 'string' ) {
  92                                                                 return that.get( values[s], selection[s] );
  93                                                         } else {
  94                                                                 return that.get( selection[s] );
  95                                                         }
  96                                                 }
  97                                         }
  98                                         return results;
  99                                 } else if ( typeof selection === 'string' ) {
 100                                         if ( typeof values[selection] === 'undefined' ) {
 101                                                 return typeof options === 'object' && 'fallback' in options ?
 102                                                         options.fallback : '<' + selection + '>';
 103                                         } else {
 104                                                 if ( typeof parser === 'function' ) {
 105                                                         return parser( values[selection], options );
 106                                                 } else {
 107                                                         return values[selection];
 108                                                 }
 109                                         }
 110                                 } else {
 111                                         return values;
 112                                 }
 113                         };
 114
 115                         /**
 116                          * Sets one or multiple configuration values using a key and a value or an object of keys and values
 117                          *
 118                          * @param {mixed} key string of name by which value will be made accessible, or object of name/value pairs
 119                          * @param {mixed} value optional value to set, only in use when key is a string
 120                          */
 121                         this.set = function( selection, value ) {
 122                                 if ( typeof selection === 'object' ) {
 123                                         for ( var s in selection ) {
 124                                                 values[s] = selection[s];
 125                                         }
 126                                 } else if ( typeof selection === 'string' && typeof value !== 'undefined' ) {
 127                                         values[selection] = value;
 128                                 }
 129                         };
 130
 131                         /**
 132                          * Checks if one or multiple configuration fields exist
 133                          */
 134                         this.exists = function( selection ) {
 135                                 if ( typeof keys === 'object' ) {
 136                                         for ( var s = 0; s < selection.length; s++ ) {
 137                                                 if ( !( selection[s] in values ) ) {
 138                                                         return false;
 139                                                 }
 140                                         }
 141                                         return true;
 142                                 } else {
 143                                         return selection in values;
 144                                 }
 145                         };
 146                 }
 147         };
 148
 149         /* Methods */
 150
 151         /*
 152          * Dummy function which in debug mode can be replaced with a function that does something clever
 153          */
 154         this.log = function() { };
 155
 156         /*
 157          * List of configuration values
 158          *
 159          * In legacy mode the values this object wraps will be in the global space
 160          */
 161         this.config = new this.prototypes.configuration( LEGACY_GLOBALS );
 162
 163         /*
 164          * Information about the current user
 165          */
 166         this.user = new ( function() {
 167
 168                 /* Public Members */
 169
 170                 this.options = new that.prototypes.configuration();
 171         } )();
 172
 173         /*
 174          * Basic parser, can be replaced with something more robust
 175          */
 176         this.parser = function( text, options ) {
 177                 if ( typeof options === 'object' && typeof options.parameters === 'object' ) {
 178                         for ( var p = 0; p < options.parameters.length; p++ ) {
 179                                 text = text.replace( '\$' + ( parseInt( p ) + 1 ), options.parameters[p] );
 180                         }
 181                 }
 182                 return text;
 183         };
 184
 185         /*
 186          * Localization system
 187          */
 188         this.msg = new that.prototypes.configuration( false, this.parser );
 189
 190         /*
 191          * Client-side module loader which integrates with the MediaWiki ResourceLoader
 192          */
 193         this.loader = new ( function() {
 194
 195                 /* Private Members */
 196
 197                 var that = this;
 198                 /*
 199                  * Mapping of registered modules
 200                  *
 201                  * The jquery module is pre-registered, because it must have already been provided for this object to have
 202                  * been built, and in debug mode jquery would have been provided through a unique loader request, making it
 203                  * impossible to hold back registration of jquery until after mediawiki.
 204                  *
 205                  * Format:
 206                  *      {
 207                  *              'moduleName': {
 208                  *                      'dependencies': ['required module', 'required module', ...], (or) function() {}
 209                  *                      'state': 'registered', 'loading', 'loaded', 'ready', or 'error'
 210                  *                      'script': function() {},
 211                  *                      'style': 'css code string',
 212                  *                      'messages': { 'key': 'value' },
 213                  *                      'version': ############## (unix timestamp)
 214                  *              }
 215                  *      }
 216                  */
 217                 var registry = {};
 218                 // List of modules which will be loaded as when ready
 219                 var batch = [];
 220                 // List of modules to be loaded
 221                 var queue = [];
 222                 // List of callback functions waiting for modules to be ready to be called
 223                 var jobs = [];
 224                 // Flag indicating that requests should be suspended
 225                 var suspended = true;
 226                 // Flag inidicating that document ready has occured
 227                 var ready = false;
 228
 229                 /* Private Methods */
 230
 231                 /**
 232                  * Generates an ISO8601 "basic" string from a UNIX timestamp
 233                  */
 234                 function formatVersionNumber( timestamp ) {
 235                         function pad( a, b, c ) {
 236                                 return [a < 10 ? '0' + a : a, b < 10 ? '0' + b : b, c < 10 ? '0' + c : c].join();
 237                         }
 238                         var d = new Date()
 239                         d.setTime( timestamp * 1000 );
 240                         return [
 241                                 pad( d.getUTCFullYear(), d.getUTCMonth() + 1, d.getUTCDate() ), 'T',
 242                                 pad( d.getUTCHours(), d.getUTCMinutes(), d.getUTCSeconds() ), 'Z'
 243                         ].join();
 244                 }
 245
 246                 /**
 247                  * Recursively resolves dependencies and detects circular references
 248                  */
 249                 function recurse( module, resolved, unresolved ) {
 250                         unresolved[unresolved.length] = module;
 251                         // Resolves dynamic loader function and replaces it with it's own results
 252                         if ( typeof registry[module].dependencies === 'function' ) {
 253                                 registry[module].dependencies = registry[module].dependencies();
 254                                 // Gaurantees the module's dependencies are always in an array
 255                                 if ( typeof registry[module].dependencies !== 'object' ) {
 256                                         registry[module].dependencies = [registry[module].dependencies];
 257                                 }
 258                         }
 259                         // Tracks down dependencies
 260                         for ( var n = 0; n < registry[module].dependencies.length; n++ ) {
 261                                 if ( resolved.indexOf( registry[module].dependencies[n] ) === -1 ) {
 262                                         if ( unresolved.indexOf( registry[module].dependencies[n] ) !== -1 ) {
 263                                                 throw new Error(
 264                                                         'Circular reference detected: ' + module + ' -> ' + registry[module].dependencies[n]
 265                                                 );
 266                                         }
 267                                         recurse( registry[module].dependencies[n], resolved, unresolved );
 268                                 }
 269                         }
 270                         resolved[resolved.length] = module;
 271                         unresolved.splice( unresolved.indexOf( module ), 1 );
 272                 }
 273
 274                 /**
 275                  * Gets a list of modules names that a module dependencies in their proper dependency order
 276                  *
 277                  * @param mixed string module name or array of string module names
 278                  * @return list of dependencies
 279                  * @throws Error if circular reference is detected
 280                  */
 281                 function resolve( module, resolved, unresolved ) {
 282                         // Allow calling with an array of module names
 283                         if ( typeof module === 'object' ) {
 284                                 var modules = [];
 285                                 for ( var m = 0; m < module.length; m++ ) {
 286                                         var dependencies = resolve( module[m] );
 287                                         for ( var n = 0; n < dependencies.length; n++ ) {
 288                                                 modules[modules.length] = dependencies[n];
 289                                         }
 290                                 }
 291                                 return modules;
 292                         } else if ( typeof module === 'string' ) {
 293                                 // Undefined modules have no dependencies
 294                                 if ( !( module in registry ) ) {
 295                                         return [];
 296                                 }
 297                                 var resolved = [];
 298                                 recurse( module, resolved, [] );
 299                                 return resolved;
 300                         }
 301                         throw new Error( 'Invalid module argument: ' + module );
 302                 };
 303
 304                 /**
 305                  * Narrows a list of module names down to those matching a specific state. Possible states are 'undefined',
 306                  * 'registered', 'loading', 'loaded', or 'ready'
 307                  *
 308                  * @param mixed string or array of strings of module states to filter by
 309                  * @param array list of module names to filter (optional, all modules will be used by default)
 310                  * @return array list of filtered module names
 311                  */
 312                 function filter( states, modules ) {
 313                         // Allow states to be given as a string
 314                         if ( typeof states === 'string' ) {
 315                                 states = [states];
 316                         }
 317                         // If called without a list of modules, build and use a list of all modules
 318                         var list = [];
 319                         if ( typeof modules === 'undefined' ) {
 320                                 modules = [];
 321                                 for ( module in registry ) {
 322                                         modules[modules.length] = module;
 323                                 }
 324                         }
 325                         // Build a list of modules which are in one of the specified states
 326                         for ( var s = 0; s < states.length; s++ ) {
 327                                 for ( var m = 0; m < modules.length; m++ ) {
 328                                         if (
 329                                                 ( states[s] == 'undefined' && typeof registry[modules[m]] === 'undefined' ) ||
 330                                                 ( typeof registry[modules[m]] === 'object' && registry[modules[m]].state === states[s] )
 331                                         ) {
 332                                                 list[list.length] = modules[m];
 333                                         }
 334                                 }
 335                         }
 336                         return list;
 337                 }
 338
 339                 /**
 340                  * Executes a loaded module, making it ready to use
 341                  *
 342                  * @param string module name to execute
 343                  */
 344                 function execute( module ) {
 345                         if ( typeof registry[module] === 'undefined' ) {
 346                                 throw new Error( 'Module has not been registered yet: ' + module );
 347                         } else if ( registry[module].state === 'registered' ) {
 348                                 throw new Error( 'Module has not been requested from the server yet: ' + module );
 349                         } else if ( registry[module].state === 'loading' ) {
 350                                 throw new Error( 'Module has not completed loading yet: ' + module );
 351                         } else if ( registry[module].state === 'ready' ) {
 352                                 throw new Error( 'Module has already been loaded: ' + module );
 353                         }
 354                         // Add style sheet to document
 355                         if ( typeof registry[module].style === 'string' && registry[module].style.length ) {
 356                                 $( 'head' ).append( '<style type="text/css">' + registry[module].style + '</style>' );
 357                         } else if ( typeof registry[module].style === 'object' && !( registry[module].style instanceof Array ) ) {
 358                                 for ( var media in registry[module].style ) {
 359                                         $( 'head' ).append(
 360                                                 '<style type="text/css" media="' + media + '">' + registry[module].style[media] + '</style>'
 361                                         );
 362                                 }
 363                         }
 364                         // Add localizations to message system
 365                         if ( typeof registry[module].messages === 'object' ) {
 366                                 mediaWiki.msg.set( registry[module].messages );
 367                         }
 368                         // Execute script
 369                         try {
 370                                 registry[module].script();
 371                                 registry[module].state = 'ready';
 372                                 // Run jobs who's dependencies have just been met
 373                                 for ( var j = 0; j < jobs.length; j++ ) {
 374                                         if ( filter( 'ready', jobs[j].dependencies ).compare( jobs[j].dependencies ) ) {
 375                                                 if ( typeof jobs[j].ready === 'function' ) {
 376                                                         jobs[j].ready();
 377                                                 }
 378                                                 jobs.splice( j, 1 );
 379                                                 j--;
 380                                         }
 381                                 }
 382                                 // Execute modules who's dependencies have just been met
 383                                 for ( r in registry ) {
 384                                         if ( registry[r].state == 'loaded' ) {
 385                                                 if ( filter( ['ready'], registry[r].dependencies ).compare( registry[r].dependencies ) ) {
 386                                                         execute( r );
 387                                                 }
 388                                         }
 389                                 }
 390                         } catch ( e ) {
 391                                 mediaWiki.log( 'Exception thrown by ' + module + ': ' + e.message );
 392                                 mediaWiki.log( e );
 393                                 registry[module].state = 'error';
 394                                 // Run error callbacks of jobs affected by this condition
 395                                 for ( var j = 0; j < jobs.length; j++ ) {
 396                                         if ( jobs[j].dependencies.indexOf( module ) !== -1 ) {
 397                                                 if ( typeof jobs[j].error === 'function' ) {
 398                                                         jobs[j].error();
 399                                                 }
 400                                                 jobs.splice( j, 1 );
 401                                                 j--;
 402                                         }
 403                                 }
 404                         }
 405                 }
 406
 407                 /**
 408                  * Adds a dependencies to the queue with optional callbacks to be run when the dependencies are ready or fail
 409                  *
 410                  * @param mixed string moulde name or array of string module names
 411                  * @param function ready callback to execute when all dependencies are ready
 412                  * @param function error callback to execute when any dependency fails
 413                  */
 414                 function request( dependencies, ready, error ) {
 415                         // Allow calling by single module name
 416                         if ( typeof dependencies === 'string' ) {
 417                                 dependencies = [dependencies];
 418                                 if ( dependencies[0] in registry ) {
 419                                         for ( var n = 0; n < registry[dependencies[0]].dependencies.length; n++ ) {
 420                                                 dependencies[dependencies.length] = registry[dependencies[0]].dependencies[n];
 421                                         }
 422                                 }
 423                         }
 424                         // Add ready and error callbacks if they were given
 425                         if ( arguments.length > 1 ) {
 426                                 jobs[jobs.length] = {
 427                                         'dependencies': filter( ['undefined', 'registered', 'loading', 'loaded'], dependencies ),
 428                                         'ready': ready,
 429                                         'error': error
 430                                 };
 431                         }
 432                         // Queue up any dependencies that are undefined or registered
 433                         dependencies = filter( ['undefined', 'registered'], dependencies );
 434                         for ( var n = 0; n < dependencies.length; n++ ) {
 435                                 if ( queue.indexOf( dependencies[n] ) === -1 ) {
 436                                         queue[queue.length] = dependencies[n];
 437                                 }
 438                         }
 439                         // Work the queue
 440                         that.work();
 441                 }
 442
 443                 function sortQuery(o) {
 444                         var sorted = {}, key, a = [];
 445                         for ( key in o ) {
 446                                 if ( o.hasOwnProperty( key ) ) {
 447                                         a.push( key );
 448                                 }
 449                         }
 450                         a.sort();
 451                         for ( key = 0; key < a.length; key++ ) {
 452                                 sorted[a[key]] = o[a[key]];
 453                         }
 454                         return sorted;
 455                 }
 456
 457                 /* Public Methods */
 458
 459                 /**
 460                  * Requests dependencies from server, loading and executing when things when ready.
 461                  */
 462                 this.work = function() {
 463                         // Appends a list of modules to the batch
 464                         for ( var q = 0; q < queue.length; q++ ) {
 465                                 // Only request modules which are undefined or registered
 466                                 if ( !( queue[q] in registry ) || registry[queue[q]].state == 'registered' ) {
 467                                         // Prevent duplicate entries
 468                                         if ( batch.indexOf( queue[q] ) === -1 ) {
 469                                                 batch[batch.length] = queue[q];
 470                                                 // Mark registered modules as loading
 471                                                 if ( queue[q] in registry ) {
 472                                                         registry[queue[q]].state = 'loading';
 473                                                 }
 474                                         }
 475                                 }
 476                         }
 477                         // Clean up the queue
 478                         queue = [];
 479                         // After document ready, handle the batch
 480                         if ( !suspended && batch.length ) {
 481                                 // Always order modules alphabetically to help reduce cache misses for otherwise identical content
 482                                 batch.sort();
 483                                 // Build a list of request parameters
 484                                 var base = {
 485                                         'skin': mediaWiki.config.get( 'skin' ),
 486                                         'lang': mediaWiki.config.get( 'wgUserLanguage' ),
 487                                         'debug': mediaWiki.config.get( 'debug' )
 488                                 };
 489                                 // Extend request parameters with a list of modules in the batch
 490                                 var requests = [];
 491                                 if ( base.debug == '1' ) {
 492                                         for ( var b = 0; b < batch.length; b++ ) {
 493                                                 requests[requests.length] = $.extend(
 494                                                         { 'modules': batch[b], 'version': registry[batch[b]].version }, base
 495                                                 );
 496                                         }
 497                                 } else {
 498                                         // Split into groups
 499                                         var groups = {};
 500                                         for ( var b = 0; b < batch.length; b++ ) {
 501                                                 var group = registry[batch[b]].group;
 502                                                 if ( !( group in groups ) ) {
 503                                                         groups[group] = [];
 504                                                 }
 505                                                 groups[group][groups[group].length] = batch[b];
 506                                         }
 507                                         for ( var group in groups ) {
 508                                                 // Calculate the highest timestamp
 509                                                 var version = 0;
 510                                                 for ( var g = 0; g < groups[group].length; g++ ) {
 511                                                         if ( registry[groups[group][g]].version > version ) {
 512                                                                 version = registry[groups[group][g]].version;
 513                                                         }
 514                                                 }
 515                                                 requests[requests.length] = $.extend(
 516                                                         { 'modules': groups[group].join( '|' ), 'version': formatVersionNumber( version ) }, base
 517                                                 );
 518                                         }
 519                                 }
 520                                 // Clear the batch - this MUST happen before we append the script element to the body or it's
 521                                 // possible that the script will be locally cached, instantly load, and work the batch again,
 522                                 // all before we've cleared it causing each request to include modules which are already loaded
 523                                 batch = [];
 524                                 // Asynchronously append a script tag to the end of the body
 525                                 function request() {
 526                                         var html = '';
 527                                         for ( var r = 0; r < requests.length; r++ ) {
 528                                                 requests[r] = sortQuery( requests[r] );
 529                                                 // Build out the HTML
 530                                                 var src = mediaWiki.config.get( 'wgLoadScript' ) + '?' + $.param( requests[r] );
 531                                                 html += '<script type="text/javascript" src="' + src + '"></script>';
 532                                         }
 533                                         return html;
 534                                 }
 535                                 // Load asynchronously after doumument ready
 536                                 if ( ready ) {
 537                                         setTimeout(  function() { $( 'body' ).append( request() ); }, 0 )
 538                                 } else {
 539                                         document.write( request() );
 540                                 }
 541                         }
 542                 };
 543
 544                 /**
 545                  * Registers a module, letting the system know about it and it's dependencies. loader.js files contain calls
 546                  * to this function.
 547                  */
 548                 this.register = function( module, version, dependencies, group ) {
 549                         // Allow multiple registration
 550                         if ( typeof module === 'object' ) {
 551                                 for ( var m = 0; m < module.length; m++ ) {
 552                                         if ( typeof module[m] === 'string' ) {
 553                                                 that.register( module[m] );
 554                                         } else if ( typeof module[m] === 'object' ) {
 555                                                 that.register.apply( that, module[m] );
 556                                         }
 557                                 }
 558                                 return;
 559                         }
 560                         // Validate input
 561                         if ( typeof module !== 'string' ) {
 562                                 throw new Error( 'module must be a string, not a ' + typeof module );
 563                         }
 564                         if ( typeof registry[module] !== 'undefined' ) {
 565                                 throw new Error( 'module already implemeneted: ' + module );
 566                         }
 567                         // List the module as registered
 568                         registry[module] = {
 569                                 'state': 'registered',
 570                                 'group': typeof group === 'string' ? group : null,
 571                                 'dependencies': [],
 572                                 'version': typeof version !== 'undefined' ? parseInt( version ) : 0
 573                         };
 574                         if ( typeof dependencies === 'string' ) {
 575                                 // Allow dependencies to be given as a single module name
 576                                 registry[module].dependencies = [dependencies];
 577                         } else if ( typeof dependencies === 'object' || typeof dependencies === 'function' ) {
 578                                 // Allow dependencies to be given as an array of module names or a function which returns an array
 579                                 registry[module].dependencies = dependencies;
 580                         }
 581                 };
 582
 583                 /**
 584                  * Implements a module, giving the system a course of action to take upon loading. Results of a request for
 585                  * one or more modules contain calls to this function.
 586                  */
 587                 this.implement = function( module, script, style, localization ) {
 588                         // Automaically register module
 589                         if ( typeof registry[module] === 'undefined' ) {
 590                                 that.register( module );
 591                         }
 592                         // Validate input
 593                         if ( typeof script !== 'function' ) {
 594                                 throw new Error( 'script must be a function, not a ' + typeof script );
 595                         }
 596                         if ( typeof style !== 'undefined' && typeof style !== 'string' && typeof style !== 'object' ) {
 597                                 throw new Error( 'style must be a string or object, not a ' + typeof style );
 598                         }
 599                         if ( typeof localization !== 'undefined' && typeof localization !== 'object' ) {
 600                                 throw new Error( 'localization must be an object, not a ' + typeof localization );
 601                         }
 602                         if ( typeof registry[module] !== 'undefined' && typeof registry[module].script !== 'undefined' ) {
 603                                 throw new Error( 'module already implemeneted: ' + module );
 604                         }
 605                         // Mark module as loaded
 606                         registry[module].state = 'loaded';
 607                         // Attach components
 608                         registry[module].script = script;
 609                         if ( typeof style === 'string' || typeof style === 'object' && !( style instanceof Array ) ) {
 610                                 registry[module].style = style;
 611                         }
 612                         if ( typeof localization === 'object' ) {
 613                                 registry[module].messages = localization;
 614                         }
 615                         // Execute or queue callback
 616                         if ( filter( ['ready'], registry[module].dependencies ).compare( registry[module].dependencies ) ) {
 617                                 execute( module );
 618                         } else {
 619                                 request( module );
 620                         }
 621                 };
 622
 623                 /**
 624                  * Executes a function as soon as one or more required modules are ready
 625                  *
 626                  * @param mixed string or array of strings of modules names the callback dependencies to be ready before
 627                  * executing
 628                  * @param function callback to execute when all dependencies are ready (optional)
 629                  * @param function callback to execute when if dependencies have a errors (optional)
 630                  */
 631                 this.using = function( dependencies, ready, error ) {
 632                         // Validate input
 633                         if ( typeof dependencies !== 'object' && typeof dependencies !== 'string' ) {
 634                                 throw new Error( 'dependencies must be a string or an array, not a ' + typeof dependencies )
 635                         }
 636                         // Allow calling with a single dependency as a string
 637                         if ( typeof dependencies === 'string' ) {
 638                                 dependencies = [dependencies];
 639                         }
 640                         // Resolve entire dependency map
 641                         dependencies = resolve( dependencies );
 642                         // If all dependencies are met, execute ready immediately
 643                         if ( filter( ['ready'], dependencies ).compare( dependencies ) ) {
 644                                 if ( typeof ready === 'function' ) {
 645                                         ready();
 646                                 }
 647                         }
 648                         // If any dependencies have errors execute error immediately
 649                         else if ( filter( ['error'], dependencies ).length ) {
 650                                 if ( typeof error === 'function' ) {
 651                                         error();
 652                                 }
 653                         }
 654                         // Since some dependencies are not yet ready, queue up a request
 655                         else {
 656                                 request( dependencies, ready, error );
 657                         }
 658                 };
 659
 660                 /**
 661                  * Loads an external script or one or more modules for future use
 662                  *
 663                  * @param {mixed} modules either the name of a module, array of modules, or a URL of an external script or style
 664                  * @param {string} type mime-type to use if calling with a URL of an external script or style; acceptable values
 665                  * are "text/css" and "text/javascript"; if no type is provided, text/javascript is assumed
 666                  */
 667                 this.load = function( modules, type ) {
 668                         // Validate input
 669                         if ( typeof modules !== 'object' && typeof modules !== 'string' ) {
 670                                 throw new Error( 'dependencies must be a string or an array, not a ' + typeof dependencies )
 671                         }
 672                         // Allow calling with an external script or single dependency as a string
 673                         if ( typeof modules === 'string' ) {
 674                                 // Support adding arbitrary external scripts
 675                                 if ( modules.substr( 0, 7 ) == 'http://' || modules.substr( 0, 8 ) == 'https://' ) {
 676                                         if ( type === 'text/css' ) {
 677                                                 setTimeout(  function() {
 678                                                         $( 'head' ).append( '<link rel="stylesheet" type="text/css" href="' + modules + '" />' );
 679                                                 }, 0 );
 680                                                 return true;
 681                                         } else if ( type === 'text/javascript' || typeof type === 'undefined' ) {
 682                                                 setTimeout(  function() {
 683                                                         $( 'body' ).append( '<script type="text/javascript" src="' + modules + '"></script>' );
 684                                                 }, 0 );
 685                                                 return true;
 686                                         }
 687                                         // Unknown type
 688                                         return false;
 689                                 }
 690                                 // Called with single module
 691                                 modules = [modules];
 692                         }
 693                         // Resolve entire dependency map
 694                         modules = resolve( modules );
 695                         // If all modules are ready, nothing dependency be done
 696                         if ( filter( ['ready'], modules ).compare( modules ) ) {
 697                                 return true;
 698                         }
 699                         // If any modules have errors return false
 700                         else if ( filter( ['error'], modules ).length ) {
 701                                 return false;
 702                         }
 703                         // Since some modules are not yet ready, queue up a request
 704                         else {
 705                                 request( modules );
 706                                 return true;
 707                         }
 708                 };
 709
 710                 /**
 711                  * Flushes the request queue and begin executing load requests on demand
 712                  */
 713                 this.go = function() {
 714                         suspended = false;
 715                         that.work();
 716                 };
 717
 718                 /**
 719                  * Changes the state of a module
 720                  *
 721                  * @param mixed module string module name or object of module name/state pairs
 722                  * @param string state string state name
 723                  */
 724                 this.state = function( module, state ) {
 725                         if ( typeof module === 'object' ) {
 726                                 for ( var m in module ) {
 727                                         that.state( m, module[m] );
 728                                 }
 729                                 return;
 730                         }
 731                         if ( !( module in registry ) ) {
 732                                 that.register( module );
 733                         }
 734                         registry[module].state = state;
 735                 };
 736
 737                 /**
 738                  * Gets the version of a module
 739                  *
 740                  * @param string module name of module to get version for
 741                  */
 742                 this.version = function( module ) {
 743                         if ( module in registry && 'version' in registry[module] ) {
 744                                 return formatVersionNumber( registry[module].version );
 745                         }
 746                         return null;
 747                 }
 748
 749                 /* Cache document ready status */
 750
 751                 $(document).ready( function() { ready = true; } );
 752         } )();
 753
 754         /* Extension points */
 755
 756         this.util = {};
 757         this.legacy = {};
 758
 759 } )( jQuery );
 760
 761
 762 /* Auto-register from pre-loaded startup scripts */
 763
 764 if ( typeof window['startUp'] === 'function' ) {
 765         window['startUp']();
 766         delete window['startUp'];
 767 }