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 'fallback' in options !== 'undefined' ? options.fallback : null;
 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 string from a UNIX timestamp
 233                  */
 234                 function formatVersionNumber( timestamp ) {
 235                         var date = new Date();
 236                         date.setTime( timestamp * 1000 );
 237                         function pad1( n ) {
 238                                 return n < 10 ? '0' + n : n
 239                         }
 240                         function pad2( n ) {
 241                                 return n < 10 ? '00' + n : ( n < 100 ? '0' + n : n );
 242                         }
 243                         return date.getUTCFullYear() + '-' +
 244                                 pad1( date.getUTCMonth() + 1 ) + '-' +
 245                                 pad1( date.getUTCDate() ) + 'T' +
 246                                 pad1( date.getUTCHours() ) + ':' +
 247                                 pad1( date.getUTCMinutes() ) + ':' +
 248                                 pad1( date.getUTCSeconds() ) +
 249                                 'Z';
 250                 }
 251
 252                 /**
 253                  * Recursively resolves dependencies and detects circular references
 254                  */
 255                 function recurse( module, resolved, unresolved ) {
 256                         unresolved[unresolved.length] = module;
 257                         // Resolves dynamic loader function and replaces it with it's own results
 258                         if ( typeof registry[module].dependencies === 'function' ) {
 259                                 registry[module].dependencies = registry[module].dependencies();
 260                                 // Gaurantees the module's dependencies are always in an array
 261                                 if ( typeof registry[module].dependencies !== 'object' ) {
 262                                         registry[module].dependencies = [registry[module].dependencies];
 263                                 }
 264                         }
 265                         // Tracks down dependencies
 266                         for ( var n = 0; n < registry[module].dependencies.length; n++ ) {
 267                                 if ( resolved.indexOf( registry[module].dependencies[n] ) === -1 ) {
 268                                         if ( unresolved.indexOf( registry[module].dependencies[n] ) !== -1 ) {
 269                                                 throw new Error(
 270                                                         'Circular reference detected: ' + module + ' -> ' + registry[module].dependencies[n]
 271                                                 );
 272                                         }
 273                                         recurse( registry[module].dependencies[n], resolved, unresolved );
 274                                 }
 275                         }
 276                         resolved[resolved.length] = module;
 277                         unresolved.splice( unresolved.indexOf( module ), 1 );
 278                 }
 279
 280                 /**
 281                  * Gets a list of modules names that a module dependencies in their proper dependency order
 282                  *
 283                  * @param mixed string module name or array of string module names
 284                  * @return list of dependencies
 285                  * @throws Error if circular reference is detected
 286                  */
 287                 function resolve( module, resolved, unresolved ) {
 288                         // Allow calling with an array of module names
 289                         if ( typeof module === 'object' ) {
 290                                 var modules = [];
 291                                 for ( var m = 0; m < module.length; m++ ) {
 292                                         var dependencies = resolve( module[m] );
 293                                         for ( var n = 0; n < dependencies.length; n++ ) {
 294                                                 modules[modules.length] = dependencies[n];
 295                                         }
 296                                 }
 297                                 return modules;
 298                         } else if ( typeof module === 'string' ) {
 299                                 // Undefined modules have no dependencies
 300                                 if ( !( module in registry ) ) {
 301                                         return [];
 302                                 }
 303                                 var resolved = [];
 304                                 recurse( module, resolved, [] );
 305                                 return resolved;
 306                         }
 307                         throw new Error( 'Invalid module argument: ' + module );
 308                 };
 309
 310                 /**
 311                  * Narrows a list of module names down to those matching a specific state. Possible states are 'undefined',
 312                  * 'registered', 'loading', 'loaded', or 'ready'
 313                  *
 314                  * @param mixed string or array of strings of module states to filter by
 315                  * @param array list of module names to filter (optional, all modules will be used by default)
 316                  * @return array list of filtered module names
 317                  */
 318                 function filter( states, modules ) {
 319                         // Allow states to be given as a string
 320                         if ( typeof states === 'string' ) {
 321                                 states = [states];
 322                         }
 323                         // If called without a list of modules, build and use a list of all modules
 324                         var list = [];
 325                         if ( typeof modules === 'undefined' ) {
 326                                 modules = [];
 327                                 for ( module in registry ) {
 328                                         modules[modules.length] = module;
 329                                 }
 330                         }
 331                         // Build a list of modules which are in one of the specified states
 332                         for ( var s = 0; s < states.length; s++ ) {
 333                                 for ( var m = 0; m < modules.length; m++ ) {
 334                                         if (
 335                                                 ( states[s] == 'undefined' && typeof registry[modules[m]] === 'undefined' ) ||
 336                                                 ( typeof registry[modules[m]] === 'object' && registry[modules[m]].state === states[s] )
 337                                         ) {
 338                                                 list[list.length] = modules[m];
 339                                         }
 340                                 }
 341                         }
 342                         return list;
 343                 }
 344
 345                 /**
 346                  * Executes a loaded module, making it ready to use
 347                  *
 348                  * @param string module name to execute
 349                  */
 350                 function execute( module ) {
 351                         if ( typeof registry[module] === 'undefined' ) {
 352                                 throw new Error( 'Module has not been registered yet: ' + module );
 353                         } else if ( registry[module].state === 'registered' ) {
 354                                 throw new Error( 'Module has not been requested from the server yet: ' + module );
 355                         } else if ( registry[module].state === 'loading' ) {
 356                                 throw new Error( 'Module has not completed loading yet: ' + module );
 357                         } else if ( registry[module].state === 'ready' ) {
 358                                 throw new Error( 'Module has already been loaded: ' + module );
 359                         }
 360                         // Add style sheet to document
 361                         if ( typeof registry[module].style === 'string' && registry[module].style.length ) {
 362                                 $( 'head' ).append( '<style type="text/css">' + registry[module].style + '</style>' );
 363                         } else if ( typeof registry[module].style === 'object' ) {
 364                                 for ( var media in registry[module].style ) {
 365                                         $( 'head' ).append(
 366                                                 '<style type="text/css" media="' + media + '">' + registry[module].style[media] + '</style>'
 367                                         );
 368                                 }
 369                         }
 370                         // Add localizations to message system
 371                         if ( typeof registry[module].messages === 'object' ) {
 372                                 mediaWiki.msg.set( registry[module].messages );
 373                         }
 374                         // Execute script
 375                         try {
 376                                 registry[module].script();
 377                                 registry[module].state = 'ready';
 378                                 // Run jobs who's dependencies have just been met
 379                                 for ( var j = 0; j < jobs.length; j++ ) {
 380                                         if ( filter( 'ready', jobs[j].dependencies ).compare( jobs[j].dependencies ) ) {
 381                                                 if ( typeof jobs[j].ready === 'function' ) {
 382                                                         jobs[j].ready();
 383                                                 }
 384                                                 jobs.splice( j, 1 );
 385                                                 j--;
 386                                         }
 387                                 }
 388                                 // Execute modules who's dependencies have just been met
 389                                 for ( r in registry ) {
 390                                         if ( registry[r].state == 'loaded' ) {
 391                                                 if ( filter( ['ready'], registry[r].dependencies ).compare( registry[r].dependencies ) ) {
 392                                                         execute( r );
 393                                                 }
 394                                         }
 395                                 }
 396                         } catch ( e ) {
 397                                 mediaWiki.log( 'Exception thrown by ' + module + ': ' + e.message );
 398                                 mediaWiki.log( e );
 399                                 registry[module].state = 'error';
 400                                 // Run error callbacks of jobs affected by this condition
 401                                 for ( var j = 0; j < jobs.length; j++ ) {
 402                                         if ( jobs[j].dependencies.indexOf( module ) !== -1 ) {
 403                                                 if ( typeof jobs[j].error === 'function' ) {
 404                                                         jobs[j].error();
 405                                                 }
 406                                                 jobs.splice( j, 1 );
 407                                                 j--;
 408                                         }
 409                                 }
 410                         }
 411                 }
 412
 413                 /**
 414                  * Adds a dependencies to the queue with optional callbacks to be run when the dependencies are ready or fail
 415                  *
 416                  * @param mixed string moulde name or array of string module names
 417                  * @param function ready callback to execute when all dependencies are ready
 418                  * @param function error callback to execute when any dependency fails
 419                  */
 420                 function request( dependencies, ready, error ) {
 421                         // Allow calling by single module name
 422                         if ( typeof dependencies === 'string' ) {
 423                                 dependencies = [dependencies];
 424                                 if ( dependencies[0] in registry ) {
 425                                         for ( var n = 0; n < registry[dependencies[0]].dependencies.length; n++ ) {
 426                                                 dependencies[dependencies.length] = registry[dependencies[0]].dependencies[n];
 427                                         }
 428                                 }
 429                         }
 430                         // Add ready and error callbacks if they were given
 431                         if ( arguments.length > 1 ) {
 432                                 jobs[jobs.length] = {
 433                                         'dependencies': filter( ['undefined', 'registered', 'loading', 'loaded'], dependencies ),
 434                                         'ready': ready,
 435                                         'error': error
 436                                 };
 437                         }
 438                         // Queue up any dependencies that are undefined or registered
 439                         dependencies = filter( ['undefined', 'registered'], dependencies );
 440                         for ( var n = 0; n < dependencies.length; n++ ) {
 441                                 if ( queue.indexOf( dependencies[n] ) === -1 ) {
 442                                         queue[queue.length] = dependencies[n];
 443                                 }
 444                         }
 445                         // Work the queue
 446                         that.work();
 447                 }
 448
 449                 function sortQuery(o) {
 450                         var sorted = {}, key, a = [];
 451                         for ( key in o ) {
 452                                 if ( o.hasOwnProperty( key ) ) {
 453                                         a.push( key );
 454                                 }
 455                         }
 456                         a.sort();
 457                         for ( key = 0; key < a.length; key++ ) {
 458                                 sorted[a[key]] = o[a[key]];
 459                         }
 460                         return sorted;
 461                 }
 462
 463                 /* Public Methods */
 464
 465                 /**
 466                  * Requests dependencies from server, loading and executing when things when ready.
 467                  */
 468                 this.work = function() {
 469                         // Appends a list of modules to the batch
 470                         for ( var q = 0; q < queue.length; q++ ) {
 471                                 // Only request modules which are undefined or registered
 472                                 if ( !( queue[q] in registry ) || registry[queue[q]].state == 'registered' ) {
 473                                         // Prevent duplicate entries
 474                                         if ( batch.indexOf( queue[q] ) === -1 ) {
 475                                                 batch[batch.length] = queue[q];
 476                                                 // Mark registered modules as loading
 477                                                 if ( queue[q] in registry ) {
 478                                                         registry[queue[q]].state = 'loading';
 479                                                 }
 480                                         }
 481                                 }
 482                         }
 483                         // Clean up the queue
 484                         queue = [];
 485                         // After document ready, handle the batch
 486                         if ( !suspended && batch.length ) {
 487                                 // Always order modules alphabetically to help reduce cache misses for otherwise identical content
 488                                 batch.sort();
 489                                 // Build a list of request parameters
 490                                 var base = {
 491                                         'skin': mediaWiki.config.get( 'skin' ),
 492                                         'lang': mediaWiki.config.get( 'wgUserLanguage' ),
 493                                         'debug': mediaWiki.config.get( 'debug' )
 494                                 };
 495                                 // Extend request parameters with a list of modules in the batch
 496                                 var requests = [];
 497                                 if ( base.debug == '1' ) {
 498                                         for ( var b = 0; b < batch.length; b++ ) {
 499                                                 requests[requests.length] = $.extend(
 500                                                         { 'modules': batch[b], 'version': registry[batch[b]].version }, base
 501                                                 );
 502                                         }
 503                                 } else {
 504                                         // Calculate the highest timestamp
 505                                         var version = 0;
 506                                         for ( var b = 0; b < batch.length; b++ ) {
 507                                                 if ( registry[batch[b]].version > version ) {
 508                                                         version = registry[batch[b]].version;
 509                                                 }
 510                                         }
 511                                         requests[requests.length] = $.extend(
 512                                                 { 'modules': batch.join( '|' ), 'version': formatVersionNumber( version ) }, base
 513                                         );
 514                                 }
 515                                 // Clear the batch - this MUST happen before we append the script element to the body or it's
 516                                 // possible that the script will be locally cached, instantly load, and work the batch again,
 517                                 // all before we've cleared it causing each request to include modules which are already loaded
 518                                 batch = [];
 519                                 // Asynchronously append a script tag to the end of the body
 520                                 function request() {
 521                                         var html = '';
 522                                         for ( var r = 0; r < requests.length; r++ ) {
 523                                                 requests[r] = sortQuery( requests[r] );
 524                                                 // Build out the HTML
 525                                                 var src = mediaWiki.config.get( 'wgLoadScript' ) + '?' + $.param( requests[r] );
 526                                                 html += '<script type="text/javascript" src="' + src + '"></script>';
 527                                         }
 528                                         return html;
 529                                 }
 530                                 // Load asynchronously after doumument ready
 531                                 if ( ready ) {
 532                                         setTimeout(  function() { $( 'body' ).append( request() ); }, 0 )
 533                                 } else {
 534                                         document.write( request() );
 535                                 }
 536                         }
 537                 };
 538
 539                 /**
 540                  * Registers a module, letting the system know about it and it's dependencies. loader.js files contain calls
 541                  * to this function.
 542                  */
 543                 this.register = function( module, version, dependencies, status ) {
 544                         // Allow multiple registration
 545                         if ( typeof module === 'object' ) {
 546                                 for ( var m = 0; m < module.length; m++ ) {
 547                                         if ( typeof module[m] === 'string' ) {
 548                                                 that.register( module[m] );
 549                                         } else if ( typeof module[m] === 'object' ) {
 550                                                 that.register.apply( that, module[m] );
 551                                         }
 552                                 }
 553                                 return;
 554                         }
 555                         // Validate input
 556                         if ( typeof module !== 'string' ) {
 557                                 throw new Error( 'module must be a string, not a ' + typeof module );
 558                         }
 559                         if ( typeof registry[module] !== 'undefined' && typeof status === 'undefined' ) {
 560                                 throw new Error( 'module already implemeneted: ' + module );
 561                         }
 562                         // List the module as registered
 563                         registry[module] = {
 564                                 'state': typeof status === 'string' ? status : 'registered',
 565                                 'dependencies': [],
 566                                 'version': typeof version !== 'undefined' ? parseInt( version ) : 0
 567                         };
 568                         if ( typeof dependencies === 'string' ) {
 569                                 // Allow dependencies to be given as a single module name
 570                                 registry[module].dependencies = [dependencies];
 571                         } else if ( typeof dependencies === 'object' || typeof dependencies === 'function' ) {
 572                                 // Allow dependencies to be given as an array of module names or a function which returns an array
 573                                 registry[module].dependencies = dependencies;
 574                         }
 575                 };
 576
 577                 /**
 578                  * Implements a module, giving the system a course of action to take upon loading. Results of a request for
 579                  * one or more modules contain calls to this function.
 580                  */
 581                 this.implement = function( module, script, style, localization ) {
 582                         // Automaically register module
 583                         if ( typeof registry[module] === 'undefined' ) {
 584                                 that.register( module );
 585                         }
 586                         // Validate input
 587                         if ( typeof script !== 'function' ) {
 588                                 throw new Error( 'script must be a function, not a ' + typeof script );
 589                         }
 590                         if ( typeof style !== 'undefined' && typeof style !== 'string' && typeof style !== 'object' ) {
 591                                 throw new Error( 'style must be a string or object, not a ' + typeof style );
 592                         }
 593                         if ( typeof localization !== 'undefined' && typeof localization !== 'object' ) {
 594                                 throw new Error( 'localization must be an object, not a ' + typeof localization );
 595                         }
 596                         if ( typeof registry[module] !== 'undefined' && typeof registry[module].script !== 'undefined' ) {
 597                                 throw new Error( 'module already implemeneted: ' + module );
 598                         }
 599                         // Mark module as loaded
 600                         registry[module].state = 'loaded';
 601                         // Attach components
 602                         registry[module].script = script;
 603                         if ( typeof style === 'string' || typeof style === 'object' ) {
 604                                 registry[module].style = style;
 605                         }
 606                         if ( typeof localization === 'object' ) {
 607                                 registry[module].messages = localization;
 608                         }
 609                         // Execute or queue callback
 610                         if ( filter( ['ready'], registry[module].dependencies ).compare( registry[module].dependencies ) ) {
 611                                 execute( module );
 612                         } else {
 613                                 request( module );
 614                         }
 615                 };
 616
 617                 /**
 618                  * Executes a function as soon as one or more required modules are ready
 619                  *
 620                  * @param mixed string or array of strings of modules names the callback dependencies to be ready before
 621                  * executing
 622                  * @param function callback to execute when all dependencies are ready (optional)
 623                  * @param function callback to execute when if dependencies have a errors (optional)
 624                  */
 625                 this.using = function( dependencies, ready, error ) {
 626                         // Validate input
 627                         if ( typeof dependencies !== 'object' && typeof dependencies !== 'string' ) {
 628                                 throw new Error( 'dependencies must be a string or an array, not a ' + typeof dependencies )
 629                         }
 630                         // Allow calling with a single dependency as a string
 631                         if ( typeof dependencies === 'string' ) {
 632                                 dependencies = [dependencies];
 633                         }
 634                         // Resolve entire dependency map
 635                         dependencies = resolve( dependencies );
 636                         // If all dependencies are met, execute ready immediately
 637                         if ( filter( ['ready'], dependencies ).compare( dependencies ) ) {
 638                                 if ( typeof ready !== 'function' ) {
 639                                         ready();
 640                                 }
 641                         }
 642                         // If any dependencies have errors execute error immediately
 643                         else if ( filter( ['error'], dependencies ).length ) {
 644                                 if ( typeof error === 'function' ) {
 645                                         error();
 646                                 }
 647                         }
 648                         // Since some dependencies are not yet ready, queue up a request
 649                         else {
 650                                 request( dependencies, ready, error );
 651                         }
 652                 };
 653
 654                 /**
 655                  * Loads an external script or one or more modules for future use
 656                  *
 657                  * @param {mixed} modules either the name of a module, array of modules, or a URL of an external script or style
 658                  * @param {string} type mime-type to use if calling with a URL of an external script or style; acceptable values
 659                  * are "text/css" and "text/javascript"; if no type is provided, text/javascript is assumed
 660                  */
 661                 this.load = function( modules, type ) {
 662                         // Validate input
 663                         if ( typeof modules !== 'object' && typeof modules !== 'string' ) {
 664                                 throw new Error( 'dependencies must be a string or an array, not a ' + typeof dependencies )
 665                         }
 666                         // Allow calling with an external script or single dependency as a string
 667                         if ( typeof modules === 'string' ) {
 668                                 // Support adding arbitrary external scripts
 669                                 if ( modules.substr( 0, 7 ) == 'http://' || modules.substr( 0, 8 ) == 'https://' ) {
 670                                         if ( type === 'text/css' ) {
 671                                                 setTimeout(  function() {
 672                                                         $( 'head' ).append( '<link rel="stylesheet" type="text/css" href="' + modules + '" />' );
 673                                                 }, 0 );
 674                                                 return true;
 675                                         } else if ( type === 'text/javascript' || typeof type === 'undefined' ) {
 676                                                 setTimeout(  function() {
 677                                                         $( 'body' ).append( '<script type="text/javascript" src="' + modules + '"></script>' );
 678                                                 }, 0 );
 679                                                 return true;
 680                                         }
 681                                         // Unknown type
 682                                         return false;
 683                                 }
 684                                 // Called with single module
 685                                 modules = [modules];
 686                         }
 687                         // Resolve entire dependency map
 688                         modules = resolve( modules );
 689                         // If all modules are ready, nothing dependency be done
 690                         if ( filter( ['ready'], modules ).compare( modules ) ) {
 691                                 return true;
 692                         }
 693                         // If any modules have errors return false
 694                         else if ( filter( ['error'], modules ).length ) {
 695                                 return false;
 696                         }
 697                         // Since some modules are not yet ready, queue up a request
 698                         else {
 699                                 request( modules );
 700                                 return true;
 701                         }
 702                 };
 703
 704                 /**
 705                  * Flushes the request queue and begin executing load requests on demand
 706                  */
 707                 this.go = function() {
 708                         suspended = false;
 709                         that.work();
 710                 };
 711
 712                 /**
 713                  * Changes the state of a module
 714                  *
 715                  * @param mixed module string module name or object of module name/state pairs
 716                  * @param string state string state name
 717                  */
 718                 this.state = function( module, state ) {
 719                         if ( typeof module === 'object' ) {
 720                                 for ( var m in module ) {
 721                                         that.state( m, module[m] );
 722                                 }
 723                                 return;
 724                         }
 725                         if ( module in registry ) {
 726                                 registry[module].state = state;
 727                         }
 728                 };
 729
 730                 /* Cache document ready status */
 731
 732                 $(document).ready( function() { ready = true; } );
 733         } )();
 734
 735         /* Extension points */
 736
 737         this.util = {};
 738         this.legacy = {};
 739
 740 } )( jQuery );
 741
 742
 743 /* Auto-register from pre-loaded startup scripts */
 744
 745 if ( typeof window['startUp'] === 'function' ) {
 746         window['startUp']();
 747         delete window['startUp'];
 748 }