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 before while getting a value which accepts
  59                  * value and options parameters where value is a string to be parsed and options is an object of options for the
  60                  * parser
  61                  */
  62                 'configuration': function( global, parser ) {
  63
  64                         /* Private Members */
  65
  66                         var that = this;
  67                         var values = global === true ? window : {};
  68
  69                         /* Public Methods */
  70
  71                         /**
  72                          * Gets one or more values
  73                          *
  74                          * If called with no arguments, all values will be returned. If a parser is in use, no parsing will take
  75                          * place when calling with no arguments or calling with an array of names.
  76                          *
  77                          * @param {mixed} selection string name of value to get, array of string names of values to get, or object
  78                          * of name/option pairs
  79                          * @param {object} options optional set of options which are also passed to a parser if in use; only used
  80                          * when selection is a string
  81                          * @format options
  82                          *      {
  83                          *              // Value to use if key does not exist
  84                          *              'fallback': ''
  85                          *      }
  86                          */
  87                         this.get = function( selection, options ) {
  88                                 if ( typeof selection === 'object' ) {
  89                                         var results = {};
  90                                         for ( s in selection ) {
  91                                                 if ( selection.hasOwnProperty( s ) ) {
  92                                                         if ( typeof s === 'string' ) {
  93                                                                 return that.get( values[s], selection[s] );
  94                                                         } else {
  95                                                                 return that.get( selection[s] );
  96                                                         }
  97                                                 }
  98                                         }
  99                                         return results;
 100                                 } else if ( typeof selection === 'string' ) {
 101                                         if ( typeof values[selection] === 'undefined' ) {
 102                                                 return typeof options === 'object' && 'fallback' in options ?
 103                                                         options.fallback : '<' + selection + '>';
 104                                         } else {
 105                                                 if ( typeof parser === 'function' ) {
 106                                                         return parser( values[selection], options );
 107                                                 } else {
 108                                                         return values[selection];
 109                                                 }
 110                                         }
 111                                 } else {
 112                                         return values;
 113                                 }
 114                         };
 115
 116                         /**
 117                          * Sets one or multiple configuration values using a key and a value or an object of keys and values
 118                          *
 119                          * @param {mixed} key string of name by which value will be made accessible, or object of name/value pairs
 120                          * @param {mixed} value optional value to set, only in use when key is a string
 121                          */
 122                         this.set = function( selection, value ) {
 123                                 if ( typeof selection === 'object' ) {
 124                                         for ( var s in selection ) {
 125                                                 values[s] = selection[s];
 126                                         }
 127                                 } else if ( typeof selection === 'string' && typeof value !== 'undefined' ) {
 128                                         values[selection] = value;
 129                                 }
 130                         };
 131
 132                         /**
 133                          * Checks if one or multiple configuration fields exist
 134                          */
 135                         this.exists = function( selection ) {
 136                                 if ( typeof keys === 'object' ) {
 137                                         for ( var s = 0; s < selection.length; s++ ) {
 138                                                 if ( !( selection[s] in values ) ) {
 139                                                         return false;
 140                                                 }
 141                                         }
 142                                         return true;
 143                                 } else {
 144                                         return selection in values;
 145                                 }
 146                         };
 147                 }
 148         };
 149
 150         /* Methods */
 151
 152         /*
 153          * Dummy function which in debug mode can be replaced with a function that does something clever
 154          */
 155         this.log = function() { };
 156
 157         /*
 158          * List of configuration values
 159          *
 160          * In legacy mode the values this object wraps will be in the global space
 161          */
 162         this.config = new this.prototypes.configuration( LEGACY_GLOBALS );
 163
 164         /*
 165          * Information about the current user
 166          */
 167         this.user = new ( function() {
 168
 169                 /* Public Members */
 170
 171                 this.options = new that.prototypes.configuration();
 172         } )();
 173
 174         /*
 175          * Basic parser, can be replaced with something more robust
 176          */
 177         this.parser = function( text, options ) {
 178                 if ( typeof options === 'object' && typeof options.parameters === 'object' ) {
 179                         for ( var p = 0; p < options.parameters.length; p++ ) {
 180                                 text = text.replace( '\$' + ( parseInt( p ) + 1 ), options.parameters[p] );
 181                         }
 182                 }
 183                 return text;
 184         };
 185
 186         /*
 187          * Localization system
 188          */
 189         this.msg = new that.prototypes.configuration( false, this.parser );
 190
 191         /*
 192          * Client-side module loader which integrates with the MediaWiki ResourceLoader
 193          */
 194         this.loader = new ( function() {
 195
 196                 /* Private Members */
 197
 198                 var that = this;
 199                 /*
 200                  * Mapping of registered modules
 201                  *
 202                  * The jquery module is pre-registered, because it must have already been provided for this object to have
 203                  * been built, and in debug mode jquery would have been provided through a unique loader request, making it
 204                  * impossible to hold back registration of jquery until after mediawiki.
 205                  *
 206                  * Format:
 207                  *      {
 208                  *              'moduleName': {
 209                  *                      'dependencies': ['required module', 'required module', ...], (or) function() {}
 210                  *                      'state': 'registered', 'loading', 'loaded', 'ready', or 'error'
 211                  *                      'script': function() {},
 212                  *                      'style': 'css code string',
 213                  *                      'messages': { 'key': 'value' },
 214                  *                      'version': ############## (unix timestamp)
 215                  *              }
 216                  *      }
 217                  */
 218                 var registry = {};
 219                 // List of modules which will be loaded as when ready
 220                 var batch = [];
 221                 // List of modules to be loaded
 222                 var queue = [];
 223                 // List of callback functions waiting for modules to be ready to be called
 224                 var jobs = [];
 225                 // Flag indicating that requests should be suspended
 226                 var suspended = true;
 227                 // Flag inidicating that document ready has occured
 228                 var ready = false;
 229
 230                 /* Private Methods */
 231
 232                 /**
 233                  * Generates an ISO8601 "basic" string from a UNIX timestamp
 234                  */
 235                 function formatVersionNumber( timestamp ) {
 236                         function pad( a, b, c ) {
 237                                 return [a < 10 ? '0' + a : a, b < 10 ? '0' + b : b, c < 10 ? '0' + c : c].join();
 238                         }
 239                         var d = new Date()
 240                         d.setTime( timestamp * 1000 );
 241                         return [
 242                                 pad( d.getUTCFullYear(), d.getUTCMonth() + 1, d.getUTCDate() ), 'T',
 243                                 pad( d.getUTCHours(), d.getUTCMinutes(), d.getUTCSeconds() ), 'Z'
 244                         ].join();
 245                 }
 246
 247                 /**
 248                  * Recursively resolves dependencies and detects circular references
 249                  */
 250                 function recurse( module, resolved, unresolved ) {
 251                         unresolved[unresolved.length] = module;
 252                         // Resolves dynamic loader function and replaces it with it's own results
 253                         if ( typeof registry[module].dependencies === 'function' ) {
 254                                 registry[module].dependencies = registry[module].dependencies();
 255                                 // Gaurantees the module's dependencies are always in an array
 256                                 if ( typeof registry[module].dependencies !== 'object' ) {
 257                                         registry[module].dependencies = [registry[module].dependencies];
 258                                 }
 259                         }
 260                         // Tracks down dependencies
 261                         for ( var n = 0; n < registry[module].dependencies.length; n++ ) {
 262                                 if ( resolved.indexOf( registry[module].dependencies[n] ) === -1 ) {
 263                                         if ( unresolved.indexOf( registry[module].dependencies[n] ) !== -1 ) {
 264                                                 throw new Error(
 265                                                         'Circular reference detected: ' + module + ' -> ' + registry[module].dependencies[n]
 266                                                 );
 267                                         }
 268                                         recurse( registry[module].dependencies[n], resolved, unresolved );
 269                                 }
 270                         }
 271                         resolved[resolved.length] = module;
 272                         unresolved.splice( unresolved.indexOf( module ), 1 );
 273                 }
 274
 275                 /**
 276                  * Gets a list of modules names that a module dependencies in their proper dependency order
 277                  *
 278                  * @param mixed string module name or array of string module names
 279                  * @return list of dependencies
 280                  * @throws Error if circular reference is detected
 281                  */
 282                 function resolve( module, resolved, unresolved ) {
 283                         // Allow calling with an array of module names
 284                         if ( typeof module === 'object' ) {
 285                                 var modules = [];
 286                                 for ( var m = 0; m < module.length; m++ ) {
 287                                         var dependencies = resolve( module[m] );
 288                                         for ( var n = 0; n < dependencies.length; n++ ) {
 289                                                 modules[modules.length] = dependencies[n];
 290                                         }
 291                                 }
 292                                 return modules;
 293                         } else if ( typeof module === 'string' ) {
 294                                 // Undefined modules have no dependencies
 295                                 if ( !( module in registry ) ) {
 296                                         return [];
 297                                 }
 298                                 var resolved = [];
 299                                 recurse( module, resolved, [] );
 300                                 return resolved;
 301                         }
 302                         throw new Error( 'Invalid module argument: ' + module );
 303                 };
 304
 305                 /**
 306                  * Narrows a list of module names down to those matching a specific state. Possible states are 'undefined',
 307                  * 'registered', 'loading', 'loaded', or 'ready'
 308                  *
 309                  * @param mixed string or array of strings of module states to filter by
 310                  * @param array list of module names to filter (optional, all modules will be used by default)
 311                  * @return array list of filtered module names
 312                  */
 313                 function filter( states, modules ) {
 314                         // Allow states to be given as a string
 315                         if ( typeof states === 'string' ) {
 316                                 states = [states];
 317                         }
 318                         // If called without a list of modules, build and use a list of all modules
 319                         var list = [];
 320                         if ( typeof modules === 'undefined' ) {
 321                                 modules = [];
 322                                 for ( module in registry ) {
 323                                         modules[modules.length] = module;
 324                                 }
 325                         }
 326                         // Build a list of modules which are in one of the specified states
 327                         for ( var s = 0; s < states.length; s++ ) {
 328                                 for ( var m = 0; m < modules.length; m++ ) {
 329                                         if (
 330                                                 ( states[s] == 'undefined' && typeof registry[modules[m]] === 'undefined' ) ||
 331                                                 ( typeof registry[modules[m]] === 'object' && registry[modules[m]].state === states[s] )
 332                                         ) {
 333                                                 list[list.length] = modules[m];
 334                                         }
 335                                 }
 336                         }
 337                         return list;
 338                 }
 339
 340                 /**
 341                  * Executes a loaded module, making it ready to use
 342                  *
 343                  * @param string module name to execute
 344                  */
 345                 function execute( module ) {
 346                         if ( typeof registry[module] === 'undefined' ) {
 347                                 throw new Error( 'Module has not been registered yet: ' + module );
 348                         } else if ( registry[module].state === 'registered' ) {
 349                                 throw new Error( 'Module has not been requested from the server yet: ' + module );
 350                         } else if ( registry[module].state === 'loading' ) {
 351                                 throw new Error( 'Module has not completed loading yet: ' + module );
 352                         } else if ( registry[module].state === 'ready' ) {
 353                                 throw new Error( 'Module has already been loaded: ' + module );
 354                         }
 355                         // Add style sheet to document
 356                         if ( typeof registry[module].style === 'string' && registry[module].style.length ) {
 357                                 $( 'head' ).append( '<style type="text/css">' + registry[module].style + '</style>' );
 358                         } else if ( typeof registry[module].style === 'object' && !( registry[module].style instanceof Array ) ) {
 359                                 for ( var media in registry[module].style ) {
 360                                         $( 'head' ).append(
 361                                                 '<style type="text/css" media="' + media + '">' + registry[module].style[media] + '</style>'
 362                                         );
 363                                 }
 364                         }
 365                         // Add localizations to message system
 366                         if ( typeof registry[module].messages === 'object' ) {
 367                                 mediaWiki.msg.set( registry[module].messages );
 368                         }
 369                         // Execute script
 370                         try {
 371                                 registry[module].script();
 372                                 registry[module].state = 'ready';
 373                                 // Run jobs who's dependencies have just been met
 374                                 for ( var j = 0; j < jobs.length; j++ ) {
 375                                         if ( filter( 'ready', jobs[j].dependencies ).compare( jobs[j].dependencies ) ) {
 376                                                 if ( typeof jobs[j].ready === 'function' ) {
 377                                                         jobs[j].ready();
 378                                                 }
 379                                                 jobs.splice( j, 1 );
 380                                                 j--;
 381                                         }
 382                                 }
 383                                 // Execute modules who's dependencies have just been met
 384                                 for ( r in registry ) {
 385                                         if ( registry[r].state == 'loaded' ) {
 386                                                 if ( filter( ['ready'], registry[r].dependencies ).compare( registry[r].dependencies ) ) {
 387                                                         execute( r );
 388                                                 }
 389                                         }
 390                                 }
 391                         } catch ( e ) {
 392                                 mediaWiki.log( 'Exception thrown by ' + module + ': ' + e.message );
 393                                 mediaWiki.log( e );
 394                                 registry[module].state = 'error';
 395                                 // Run error callbacks of jobs affected by this condition
 396                                 for ( var j = 0; j < jobs.length; j++ ) {
 397                                         if ( jobs[j].dependencies.indexOf( module ) !== -1 ) {
 398                                                 if ( typeof jobs[j].error === 'function' ) {
 399                                                         jobs[j].error();
 400                                                 }
 401                                                 jobs.splice( j, 1 );
 402                                                 j--;
 403                                         }
 404                                 }
 405                         }
 406                 }
 407
 408                 /**
 409                  * Adds a dependencies to the queue with optional callbacks to be run when the dependencies are ready or fail
 410                  *
 411                  * @param mixed string moulde name or array of string module names
 412                  * @param function ready callback to execute when all dependencies are ready
 413                  * @param function error callback to execute when any dependency fails
 414                  */
 415                 function request( dependencies, ready, error ) {
 416                         // Allow calling by single module name
 417                         if ( typeof dependencies === 'string' ) {
 418                                 dependencies = [dependencies];
 419                                 if ( dependencies[0] in registry ) {
 420                                         for ( var n = 0; n < registry[dependencies[0]].dependencies.length; n++ ) {
 421                                                 dependencies[dependencies.length] = registry[dependencies[0]].dependencies[n];
 422                                         }
 423                                 }
 424                         }
 425                         // Add ready and error callbacks if they were given
 426                         if ( arguments.length > 1 ) {
 427                                 jobs[jobs.length] = {
 428                                         'dependencies': filter( ['undefined', 'registered', 'loading', 'loaded'], dependencies ),
 429                                         'ready': ready,
 430                                         'error': error
 431                                 };
 432                         }
 433                         // Queue up any dependencies that are undefined or registered
 434                         dependencies = filter( ['undefined', 'registered'], dependencies );
 435                         for ( var n = 0; n < dependencies.length; n++ ) {
 436                                 if ( queue.indexOf( dependencies[n] ) === -1 ) {
 437                                         queue[queue.length] = dependencies[n];
 438                                 }
 439                         }
 440                         // Work the queue
 441                         that.work();
 442                 }
 443
 444                 function sortQuery(o) {
 445                         var sorted = {}, key, a = [];
 446                         for ( key in o ) {
 447                                 if ( o.hasOwnProperty( key ) ) {
 448                                         a.push( key );
 449                                 }
 450                         }
 451                         a.sort();
 452                         for ( key = 0; key < a.length; key++ ) {
 453                                 sorted[a[key]] = o[a[key]];
 454                         }
 455                         return sorted;
 456                 }
 457
 458                 /* Public Methods */
 459
 460                 /**
 461                  * Requests dependencies from server, loading and executing when things when ready.
 462                  */
 463                 this.work = function() {
 464                         // Appends a list of modules to the batch
 465                         for ( var q = 0; q < queue.length; q++ ) {
 466                                 // Only request modules which are undefined or registered
 467                                 if ( !( queue[q] in registry ) || registry[queue[q]].state == 'registered' ) {
 468                                         // Prevent duplicate entries
 469                                         if ( batch.indexOf( queue[q] ) === -1 ) {
 470                                                 batch[batch.length] = queue[q];
 471                                                 // Mark registered modules as loading
 472                                                 if ( queue[q] in registry ) {
 473                                                         registry[queue[q]].state = 'loading';
 474                                                 }
 475                                         }
 476                                 }
 477                         }
 478                         // Clean up the queue
 479                         queue = [];
 480                         // After document ready, handle the batch
 481                         if ( !suspended && batch.length ) {
 482                                 // Always order modules alphabetically to help reduce cache misses for otherwise identical content
 483                                 batch.sort();
 484                                 // Build a list of request parameters
 485                                 var base = {
 486                                         'skin': mediaWiki.config.get( 'skin' ),
 487                                         'lang': mediaWiki.config.get( 'wgUserLanguage' ),
 488                                         'debug': mediaWiki.config.get( 'debug' )
 489                                 };
 490                                 // Extend request parameters with a list of modules in the batch
 491                                 var requests = [];
 492                                 if ( base.debug == '1' ) {
 493                                         for ( var b = 0; b < batch.length; b++ ) {
 494                                                 requests[requests.length] = $.extend(
 495                                                         { 'modules': batch[b], 'version': registry[batch[b]].version }, base
 496                                                 );
 497                                         }
 498                                 } else {
 499                                         // Split into groups
 500                                         var groups = {};
 501                                         for ( var b = 0; b < batch.length; b++ ) {
 502                                                 var group = registry[batch[b]].group;
 503                                                 if ( !( group in groups ) ) {
 504                                                         groups[group] = [];
 505                                                 }
 506                                                 groups[group][groups[group].length] = batch[b];
 507                                         }
 508                                         for ( var group in groups ) {
 509                                                 // Calculate the highest timestamp
 510                                                 var version = 0;
 511                                                 for ( var g = 0; g < groups[group].length; g++ ) {
 512                                                         if ( registry[groups[group][g]].version > version ) {
 513                                                                 version = registry[groups[group][g]].version;
 514                                                         }
 515                                                 }
 516                                                 requests[requests.length] = $.extend(
 517                                                         { 'modules': groups[group].join( '|' ), 'version': formatVersionNumber( version ) }, base
 518                                                 );
 519                                         }
 520                                 }
 521                                 // Clear the batch - this MUST happen before we append the script element to the body or it's
 522                                 // possible that the script will be locally cached, instantly load, and work the batch again,
 523                                 // all before we've cleared it causing each request to include modules which are already loaded
 524                                 batch = [];
 525                                 // Asynchronously append a script tag to the end of the body
 526                                 function request() {
 527                                         var html = '';
 528                                         for ( var r = 0; r < requests.length; r++ ) {
 529                                                 requests[r] = sortQuery( requests[r] );
 530                                                 // Build out the HTML
 531                                                 var src = mediaWiki.config.get( 'wgLoadScript' ) + '?' + $.param( requests[r] );
 532                                                 html += '<script type="text/javascript" src="' + src + '"></script>';
 533                                         }
 534                                         return html;
 535                                 }
 536                                 // Load asynchronously after doumument ready
 537                                 if ( ready ) {
 538                                         setTimeout(  function() { $( 'body' ).append( request() ); }, 0 )
 539                                 } else {
 540                                         document.write( request() );
 541                                 }
 542                         }
 543                 };
 544
 545                 /**
 546                  * Registers a module, letting the system know about it and it's dependencies. loader.js files contain calls
 547                  * to this function.
 548                  */
 549                 this.register = function( module, version, dependencies, group ) {
 550                         // Allow multiple registration
 551                         if ( typeof module === 'object' ) {
 552                                 for ( var m = 0; m < module.length; m++ ) {
 553                                         if ( typeof module[m] === 'string' ) {
 554                                                 that.register( module[m] );
 555                                         } else if ( typeof module[m] === 'object' ) {
 556                                                 that.register.apply( that, module[m] );
 557                                         }
 558                                 }
 559                                 return;
 560                         }
 561                         // Validate input
 562                         if ( typeof module !== 'string' ) {
 563                                 throw new Error( 'module must be a string, not a ' + typeof module );
 564                         }
 565                         if ( typeof registry[module] !== 'undefined' ) {
 566                                 throw new Error( 'module already implemeneted: ' + module );
 567                         }
 568                         // List the module as registered
 569                         registry[module] = {
 570                                 'state': 'registered',
 571                                 'group': typeof group === 'string' ? group : null,
 572                                 'dependencies': [],
 573                                 'version': typeof version !== 'undefined' ? parseInt( version ) : 0
 574                         };
 575                         if ( typeof dependencies === 'string' ) {
 576                                 // Allow dependencies to be given as a single module name
 577                                 registry[module].dependencies = [dependencies];
 578                         } else if ( typeof dependencies === 'object' || typeof dependencies === 'function' ) {
 579                                 // Allow dependencies to be given as an array of module names or a function which returns an array
 580                                 registry[module].dependencies = dependencies;
 581                         }
 582                 };
 583
 584                 /**
 585                  * Implements a module, giving the system a course of action to take upon loading. Results of a request for
 586                  * one or more modules contain calls to this function.
 587                  */
 588                 this.implement = function( module, script, style, localization ) {
 589                         // Automaically register module
 590                         if ( typeof registry[module] === 'undefined' ) {
 591                                 that.register( module );
 592                         }
 593                         // Validate input
 594                         if ( typeof script !== 'function' ) {
 595                                 throw new Error( 'script must be a function, not a ' + typeof script );
 596                         }
 597                         if ( typeof style !== 'undefined' && typeof style !== 'string' && typeof style !== 'object' ) {
 598                                 throw new Error( 'style must be a string or object, not a ' + typeof style );
 599                         }
 600                         if ( typeof localization !== 'undefined' && typeof localization !== 'object' ) {
 601                                 throw new Error( 'localization must be an object, not a ' + typeof localization );
 602                         }
 603                         if ( typeof registry[module] !== 'undefined' && typeof registry[module].script !== 'undefined' ) {
 604                                 throw new Error( 'module already implemeneted: ' + module );
 605                         }
 606                         // Mark module as loaded
 607                         registry[module].state = 'loaded';
 608                         // Attach components
 609                         registry[module].script = script;
 610                         if ( typeof style === 'string' || typeof style === 'object' && !( style instanceof Array ) ) {
 611                                 registry[module].style = style;
 612                         }
 613                         if ( typeof localization === 'object' ) {
 614                                 registry[module].messages = localization;
 615                         }
 616                         // Execute or queue callback
 617                         if ( filter( ['ready'], registry[module].dependencies ).compare( registry[module].dependencies ) ) {
 618                                 execute( module );
 619                         } else {
 620                                 request( module );
 621                         }
 622                 };
 623
 624                 /**
 625                  * Executes a function as soon as one or more required modules are ready
 626                  *
 627                  * @param mixed string or array of strings of modules names the callback dependencies to be ready before
 628                  * executing
 629                  * @param function callback to execute when all dependencies are ready (optional)
 630                  * @param function callback to execute when if dependencies have a errors (optional)
 631                  */
 632                 this.using = function( dependencies, ready, error ) {
 633                         // Validate input
 634                         if ( typeof dependencies !== 'object' && typeof dependencies !== 'string' ) {
 635                                 throw new Error( 'dependencies must be a string or an array, not a ' + typeof dependencies )
 636                         }
 637                         // Allow calling with a single dependency as a string
 638                         if ( typeof dependencies === 'string' ) {
 639                                 dependencies = [dependencies];
 640                         }
 641                         // Resolve entire dependency map
 642                         dependencies = resolve( dependencies );
 643                         // If all dependencies are met, execute ready immediately
 644                         if ( filter( ['ready'], dependencies ).compare( dependencies ) ) {
 645                                 if ( typeof ready === 'function' ) {
 646                                         ready();
 647                                 }
 648                         }
 649                         // If any dependencies have errors execute error immediately
 650                         else if ( filter( ['error'], dependencies ).length ) {
 651                                 if ( typeof error === 'function' ) {
 652                                         error();
 653                                 }
 654                         }
 655                         // Since some dependencies are not yet ready, queue up a request
 656                         else {
 657                                 request( dependencies, ready, error );
 658                         }
 659                 };
 660
 661                 /**
 662                  * Loads an external script or one or more modules for future use
 663                  *
 664                  * @param {mixed} modules either the name of a module, array of modules, or a URL of an external script or style
 665                  * @param {string} type mime-type to use if calling with a URL of an external script or style; acceptable values
 666                  * are "text/css" and "text/javascript"; if no type is provided, text/javascript is assumed
 667                  */
 668                 this.load = function( modules, type ) {
 669                         // Validate input
 670                         if ( typeof modules !== 'object' && typeof modules !== 'string' ) {
 671                                 throw new Error( 'dependencies must be a string or an array, not a ' + typeof dependencies )
 672                         }
 673                         // Allow calling with an external script or single dependency as a string
 674                         if ( typeof modules === 'string' ) {
 675                                 // Support adding arbitrary external scripts
 676                                 if ( modules.substr( 0, 7 ) == 'http://' || modules.substr( 0, 8 ) == 'https://' ) {
 677                                         if ( type === 'text/css' ) {
 678                                                 setTimeout(  function() {
 679                                                         $( 'head' ).append( '<link rel="stylesheet" type="text/css" href="' + modules + '" />' );
 680                                                 }, 0 );
 681                                                 return true;
 682                                         } else if ( type === 'text/javascript' || typeof type === 'undefined' ) {
 683                                                 setTimeout(  function() {
 684                                                         $( 'body' ).append( '<script type="text/javascript" src="' + modules + '"></script>' );
 685                                                 }, 0 );
 686                                                 return true;
 687                                         }
 688                                         // Unknown type
 689                                         return false;
 690                                 }
 691                                 // Called with single module
 692                                 modules = [modules];
 693                         }
 694                         // Resolve entire dependency map
 695                         modules = resolve( modules );
 696                         // If all modules are ready, nothing dependency be done
 697                         if ( filter( ['ready'], modules ).compare( modules ) ) {
 698                                 return true;
 699                         }
 700                         // If any modules have errors return false
 701                         else if ( filter( ['error'], modules ).length ) {
 702                                 return false;
 703                         }
 704                         // Since some modules are not yet ready, queue up a request
 705                         else {
 706                                 request( modules );
 707                                 return true;
 708                         }
 709                 };
 710
 711                 /**
 712                  * Flushes the request queue and begin executing load requests on demand
 713                  */
 714                 this.go = function() {
 715                         suspended = false;
 716                         that.work();
 717                 };
 718
 719                 /**
 720                  * Changes the state of a module
 721                  *
 722                  * @param mixed module string module name or object of module name/state pairs
 723                  * @param string state string state name
 724                  */
 725                 this.state = function( module, state ) {
 726                         if ( typeof module === 'object' ) {
 727                                 for ( var m in module ) {
 728                                         that.state( m, module[m] );
 729                                 }
 730                                 return;
 731                         }
 732                         if ( !( module in registry ) ) {
 733                                 that.register( module );
 734                         }
 735                         registry[module].state = state;
 736                 };
 737
 738                 /**
 739                  * Gets the version of a module
 740                  *
 741                  * @param string module name of module to get version for
 742                  */
 743                 this.version = function( module ) {
 744                         if ( module in registry && 'version' in registry[module] ) {
 745                                 return formatVersionNumber( registry[module].version );
 746                         }
 747                         return null;
 748                 }
 749
 750                 /* Cache document ready status */
 751
 752                 $(document).ready( function() { ready = true; } );
 753         } )();
 754
 755         /* Extension points */
 756
 757         this.util = {};
 758         this.legacy = {};
 759
 760 } )( jQuery );
 761
 762
 763 /* Auto-register from pre-loaded startup scripts */
 764
 765 if ( typeof window['startUp'] === 'function' ) {
 766         window['startUp']();
 767         delete window['startUp'];
 768 }