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 string from a UNIX timestamp
 234                  */
 235                 function formatVersionNumber( timestamp ) {
 236                         var date = new Date();
 237                         date.setTime( timestamp * 1000 );
 238                         function pad1( n ) {
 239                                 return n < 10 ? '0' + n : n
 240                         }
 241                         function pad2( n ) {
 242                                 return n < 10 ? '00' + n : ( n < 100 ? '0' + n : n );
 243                         }
 244                         return date.getUTCFullYear() + '-' +
 245                                 pad1( date.getUTCMonth() + 1 ) + '-' +
 246                                 pad1( date.getUTCDate() ) + 'T' +
 247                                 pad1( date.getUTCHours() ) + ':' +
 248                                 pad1( date.getUTCMinutes() ) + ':' +
 249                                 pad1( date.getUTCSeconds() ) +
 250                                 'Z';
 251                 }
 252
 253                 /**
 254                  * Recursively resolves dependencies and detects circular references
 255                  */
 256                 function recurse( module, resolved, unresolved ) {
 257                         unresolved[unresolved.length] = module;
 258                         // Resolves dynamic loader function and replaces it with it's own results
 259                         if ( typeof registry[module].dependencies === 'function' ) {
 260                                 registry[module].dependencies = registry[module].dependencies();
 261                                 // Gaurantees the module's dependencies are always in an array
 262                                 if ( typeof registry[module].dependencies !== 'object' ) {
 263                                         registry[module].dependencies = [registry[module].dependencies];
 264                                 }
 265                         }
 266                         // Tracks down dependencies
 267                         for ( var n = 0; n < registry[module].dependencies.length; n++ ) {
 268                                 if ( resolved.indexOf( registry[module].dependencies[n] ) === -1 ) {
 269                                         if ( unresolved.indexOf( registry[module].dependencies[n] ) !== -1 ) {
 270                                                 throw new Error(
 271                                                         'Circular reference detected: ' + module + ' -> ' + registry[module].dependencies[n]
 272                                                 );
 273                                         }
 274                                         recurse( registry[module].dependencies[n], resolved, unresolved );
 275                                 }
 276                         }
 277                         resolved[resolved.length] = module;
 278                         unresolved.splice( unresolved.indexOf( module ), 1 );
 279                 }
 280
 281                 /**
 282                  * Gets a list of modules names that a module dependencies in their proper dependency order
 283                  *
 284                  * @param mixed string module name or array of string module names
 285                  * @return list of dependencies
 286                  * @throws Error if circular reference is detected
 287                  */
 288                 function resolve( module, resolved, unresolved ) {
 289                         // Allow calling with an array of module names
 290                         if ( typeof module === 'object' ) {
 291                                 var modules = [];
 292                                 for ( var m = 0; m < module.length; m++ ) {
 293                                         var dependencies = resolve( module[m] );
 294                                         for ( var n = 0; n < dependencies.length; n++ ) {
 295                                                 modules[modules.length] = dependencies[n];
 296                                         }
 297                                 }
 298                                 return modules;
 299                         } else if ( typeof module === 'string' ) {
 300                                 // Undefined modules have no dependencies
 301                                 if ( !( module in registry ) ) {
 302                                         return [];
 303                                 }
 304                                 var resolved = [];
 305                                 recurse( module, resolved, [] );
 306                                 return resolved;
 307                         }
 308                         throw new Error( 'Invalid module argument: ' + module );
 309                 };
 310
 311                 /**
 312                  * Narrows a list of module names down to those matching a specific state. Possible states are 'undefined',
 313                  * 'registered', 'loading', 'loaded', or 'ready'
 314                  *
 315                  * @param mixed string or array of strings of module states to filter by
 316                  * @param array list of module names to filter (optional, all modules will be used by default)
 317                  * @return array list of filtered module names
 318                  */
 319                 function filter( states, modules ) {
 320                         // Allow states to be given as a string
 321                         if ( typeof states === 'string' ) {
 322                                 states = [states];
 323                         }
 324                         // If called without a list of modules, build and use a list of all modules
 325                         var list = [];
 326                         if ( typeof modules === 'undefined' ) {
 327                                 modules = [];
 328                                 for ( module in registry ) {
 329                                         modules[modules.length] = module;
 330                                 }
 331                         }
 332                         // Build a list of modules which are in one of the specified states
 333                         for ( var s = 0; s < states.length; s++ ) {
 334                                 for ( var m = 0; m < modules.length; m++ ) {
 335                                         if (
 336                                                 ( states[s] == 'undefined' && typeof registry[modules[m]] === 'undefined' ) ||
 337                                                 ( typeof registry[modules[m]] === 'object' && registry[modules[m]].state === states[s] )
 338                                         ) {
 339                                                 list[list.length] = modules[m];
 340                                         }
 341                                 }
 342                         }
 343                         return list;
 344                 }
 345
 346                 /**
 347                  * Executes a loaded module, making it ready to use
 348                  *
 349                  * @param string module name to execute
 350                  */
 351                 function execute( module ) {
 352                         if ( typeof registry[module] === 'undefined' ) {
 353                                 throw new Error( 'Module has not been registered yet: ' + module );
 354                         } else if ( registry[module].state === 'registered' ) {
 355                                 throw new Error( 'Module has not been requested from the server yet: ' + module );
 356                         } else if ( registry[module].state === 'loading' ) {
 357                                 throw new Error( 'Module has not completed loading yet: ' + module );
 358                         } else if ( registry[module].state === 'ready' ) {
 359                                 throw new Error( 'Module has already been loaded: ' + module );
 360                         }
 361                         // Add style sheet to document
 362                         if ( typeof registry[module].style === 'string' && registry[module].style.length ) {
 363                                 $( 'head' ).append( '<style type="text/css">' + registry[module].style + '</style>' );
 364                         } else if ( typeof registry[module].style === 'object' && !( registry[module].style instanceof Array ) ) {
 365                                 for ( var media in registry[module].style ) {
 366                                         $( 'head' ).append(
 367                                                 '<style type="text/css" media="' + media + '">' + registry[module].style[media] + '</style>'
 368                                         );
 369                                 }
 370                         }
 371                         // Add localizations to message system
 372                         if ( typeof registry[module].messages === 'object' ) {
 373                                 mediaWiki.msg.set( registry[module].messages );
 374                         }
 375                         // Execute script
 376                         try {
 377                                 registry[module].script();
 378                                 registry[module].state = 'ready';
 379                                 // Run jobs who's dependencies have just been met
 380                                 for ( var j = 0; j < jobs.length; j++ ) {
 381                                         if ( filter( 'ready', jobs[j].dependencies ).compare( jobs[j].dependencies ) ) {
 382                                                 if ( typeof jobs[j].ready === 'function' ) {
 383                                                         jobs[j].ready();
 384                                                 }
 385                                                 jobs.splice( j, 1 );
 386                                                 j--;
 387                                         }
 388                                 }
 389                                 // Execute modules who's dependencies have just been met
 390                                 for ( r in registry ) {
 391                                         if ( registry[r].state == 'loaded' ) {
 392                                                 if ( filter( ['ready'], registry[r].dependencies ).compare( registry[r].dependencies ) ) {
 393                                                         execute( r );
 394                                                 }
 395                                         }
 396                                 }
 397                         } catch ( e ) {
 398                                 mediaWiki.log( 'Exception thrown by ' + module + ': ' + e.message );
 399                                 mediaWiki.log( e );
 400                                 registry[module].state = 'error';
 401                                 // Run error callbacks of jobs affected by this condition
 402                                 for ( var j = 0; j < jobs.length; j++ ) {
 403                                         if ( jobs[j].dependencies.indexOf( module ) !== -1 ) {
 404                                                 if ( typeof jobs[j].error === 'function' ) {
 405                                                         jobs[j].error();
 406                                                 }
 407                                                 jobs.splice( j, 1 );
 408                                                 j--;
 409                                         }
 410                                 }
 411                         }
 412                 }
 413
 414                 /**
 415                  * Adds a dependencies to the queue with optional callbacks to be run when the dependencies are ready or fail
 416                  *
 417                  * @param mixed string moulde name or array of string module names
 418                  * @param function ready callback to execute when all dependencies are ready
 419                  * @param function error callback to execute when any dependency fails
 420                  */
 421                 function request( dependencies, ready, error ) {
 422                         // Allow calling by single module name
 423                         if ( typeof dependencies === 'string' ) {
 424                                 dependencies = [dependencies];
 425                                 if ( dependencies[0] in registry ) {
 426                                         for ( var n = 0; n < registry[dependencies[0]].dependencies.length; n++ ) {
 427                                                 dependencies[dependencies.length] = registry[dependencies[0]].dependencies[n];
 428                                         }
 429                                 }
 430                         }
 431                         // Add ready and error callbacks if they were given
 432                         if ( arguments.length > 1 ) {
 433                                 jobs[jobs.length] = {
 434                                         'dependencies': filter( ['undefined', 'registered', 'loading', 'loaded'], dependencies ),
 435                                         'ready': ready,
 436                                         'error': error
 437                                 };
 438                         }
 439                         // Queue up any dependencies that are undefined or registered
 440                         dependencies = filter( ['undefined', 'registered'], dependencies );
 441                         for ( var n = 0; n < dependencies.length; n++ ) {
 442                                 if ( queue.indexOf( dependencies[n] ) === -1 ) {
 443                                         queue[queue.length] = dependencies[n];
 444                                 }
 445                         }
 446                         // Work the queue
 447                         that.work();
 448                 }
 449
 450                 function sortQuery(o) {
 451                         var sorted = {}, key, a = [];
 452                         for ( key in o ) {
 453                                 if ( o.hasOwnProperty( key ) ) {
 454                                         a.push( key );
 455                                 }
 456                         }
 457                         a.sort();
 458                         for ( key = 0; key < a.length; key++ ) {
 459                                 sorted[a[key]] = o[a[key]];
 460                         }
 461                         return sorted;
 462                 }
 463
 464                 /* Public Methods */
 465
 466                 /**
 467                  * Requests dependencies from server, loading and executing when things when ready.
 468                  */
 469                 this.work = function() {
 470                         // Appends a list of modules to the batch
 471                         for ( var q = 0; q < queue.length; q++ ) {
 472                                 // Only request modules which are undefined or registered
 473                                 if ( !( queue[q] in registry ) || registry[queue[q]].state == 'registered' ) {
 474                                         // Prevent duplicate entries
 475                                         if ( batch.indexOf( queue[q] ) === -1 ) {
 476                                                 batch[batch.length] = queue[q];
 477                                                 // Mark registered modules as loading
 478                                                 if ( queue[q] in registry ) {
 479                                                         registry[queue[q]].state = 'loading';
 480                                                 }
 481                                         }
 482                                 }
 483                         }
 484                         // Clean up the queue
 485                         queue = [];
 486                         // After document ready, handle the batch
 487                         if ( !suspended && batch.length ) {
 488                                 // Always order modules alphabetically to help reduce cache misses for otherwise identical content
 489                                 batch.sort();
 490                                 // Build a list of request parameters
 491                                 var base = {
 492                                         'skin': mediaWiki.config.get( 'skin' ),
 493                                         'lang': mediaWiki.config.get( 'wgUserLanguage' ),
 494                                         'debug': mediaWiki.config.get( 'debug' )
 495                                 };
 496                                 // Extend request parameters with a list of modules in the batch
 497                                 var requests = [];
 498                                 if ( base.debug == '1' ) {
 499                                         for ( var b = 0; b < batch.length; b++ ) {
 500                                                 requests[requests.length] = $.extend(
 501                                                         { 'modules': batch[b], 'version': registry[batch[b]].version }, base
 502                                                 );
 503                                         }
 504                                 } else {
 505                                         // Split into groups
 506                                         var groups = {};
 507                                         for ( var b = 0; b < batch.length; b++ ) {
 508                                                 var group = registry[batch[b]].group;
 509                                                 if ( !( group in groups ) ) {
 510                                                         groups[group] = [];
 511                                                 }
 512                                                 groups[group][groups[group].length] = batch[b];
 513                                         }
 514                                         for ( var group in groups ) {
 515                                                 // Calculate the highest timestamp
 516                                                 var version = 0;
 517                                                 for ( var g = 0; g < groups[group].length; g++ ) {
 518                                                         if ( registry[groups[group][g]].version > version ) {
 519                                                                 version = registry[groups[group][g]].version;
 520                                                         }
 521                                                 }
 522                                                 requests[requests.length] = $.extend(
 523                                                         { 'modules': groups[group].join( '|' ), 'version': formatVersionNumber( version ) }, base
 524                                                 );
 525                                         }
 526                                 }
 527                                 // Clear the batch - this MUST happen before we append the script element to the body or it's
 528                                 // possible that the script will be locally cached, instantly load, and work the batch again,
 529                                 // all before we've cleared it causing each request to include modules which are already loaded
 530                                 batch = [];
 531                                 // Asynchronously append a script tag to the end of the body
 532                                 function request() {
 533                                         var html = '';
 534                                         for ( var r = 0; r < requests.length; r++ ) {
 535                                                 requests[r] = sortQuery( requests[r] );
 536                                                 // Build out the HTML
 537                                                 var src = mediaWiki.config.get( 'wgLoadScript' ) + '?' + $.param( requests[r] );
 538                                                 html += '<script type="text/javascript" src="' + src + '"></script>';
 539                                         }
 540                                         return html;
 541                                 }
 542                                 // Load asynchronously after doumument ready
 543                                 if ( ready ) {
 544                                         setTimeout(  function() { $( 'body' ).append( request() ); }, 0 )
 545                                 } else {
 546                                         document.write( request() );
 547                                 }
 548                         }
 549                 };
 550
 551                 /**
 552                  * Registers a module, letting the system know about it and it's dependencies. loader.js files contain calls
 553                  * to this function.
 554                  */
 555                 this.register = function( module, version, dependencies, group ) {
 556                         // Allow multiple registration
 557                         if ( typeof module === 'object' ) {
 558                                 for ( var m = 0; m < module.length; m++ ) {
 559                                         if ( typeof module[m] === 'string' ) {
 560                                                 that.register( module[m] );
 561                                         } else if ( typeof module[m] === 'object' ) {
 562                                                 that.register.apply( that, module[m] );
 563                                         }
 564                                 }
 565                                 return;
 566                         }
 567                         // Validate input
 568                         if ( typeof module !== 'string' ) {
 569                                 throw new Error( 'module must be a string, not a ' + typeof module );
 570                         }
 571                         if ( typeof registry[module] !== 'undefined' ) {
 572                                 throw new Error( 'module already implemeneted: ' + module );
 573                         }
 574                         // List the module as registered
 575                         registry[module] = {
 576                                 'state': 'registered',
 577                                 'group': typeof group === 'string' ? group : null,
 578                                 'dependencies': [],
 579                                 'version': typeof version !== 'undefined' ? parseInt( version ) : 0
 580                         };
 581                         if ( typeof dependencies === 'string' ) {
 582                                 // Allow dependencies to be given as a single module name
 583                                 registry[module].dependencies = [dependencies];
 584                         } else if ( typeof dependencies === 'object' || typeof dependencies === 'function' ) {
 585                                 // Allow dependencies to be given as an array of module names or a function which returns an array
 586                                 registry[module].dependencies = dependencies;
 587                         }
 588                 };
 589
 590                 /**
 591                  * Implements a module, giving the system a course of action to take upon loading. Results of a request for
 592                  * one or more modules contain calls to this function.
 593                  */
 594                 this.implement = function( module, script, style, localization ) {
 595                         // Automaically register module
 596                         if ( typeof registry[module] === 'undefined' ) {
 597                                 that.register( module );
 598                         }
 599                         // Validate input
 600                         if ( typeof script !== 'function' ) {
 601                                 throw new Error( 'script must be a function, not a ' + typeof script );
 602                         }
 603                         if ( typeof style !== 'undefined' && typeof style !== 'string' && typeof style !== 'object' ) {
 604                                 throw new Error( 'style must be a string or object, not a ' + typeof style );
 605                         }
 606                         if ( typeof localization !== 'undefined' && typeof localization !== 'object' ) {
 607                                 throw new Error( 'localization must be an object, not a ' + typeof localization );
 608                         }
 609                         if ( typeof registry[module] !== 'undefined' && typeof registry[module].script !== 'undefined' ) {
 610                                 throw new Error( 'module already implemeneted: ' + module );
 611                         }
 612                         // Mark module as loaded
 613                         registry[module].state = 'loaded';
 614                         // Attach components
 615                         registry[module].script = script;
 616                         if ( typeof style === 'string' || typeof style === 'object' && !( style instanceof Array ) ) {
 617                                 registry[module].style = style;
 618                         }
 619                         if ( typeof localization === 'object' ) {
 620                                 registry[module].messages = localization;
 621                         }
 622                         // Execute or queue callback
 623                         if ( filter( ['ready'], registry[module].dependencies ).compare( registry[module].dependencies ) ) {
 624                                 execute( module );
 625                         } else {
 626                                 request( module );
 627                         }
 628                 };
 629
 630                 /**
 631                  * Executes a function as soon as one or more required modules are ready
 632                  *
 633                  * @param mixed string or array of strings of modules names the callback dependencies to be ready before
 634                  * executing
 635                  * @param function callback to execute when all dependencies are ready (optional)
 636                  * @param function callback to execute when if dependencies have a errors (optional)
 637                  */
 638                 this.using = function( dependencies, ready, error ) {
 639                         // Validate input
 640                         if ( typeof dependencies !== 'object' && typeof dependencies !== 'string' ) {
 641                                 throw new Error( 'dependencies must be a string or an array, not a ' + typeof dependencies )
 642                         }
 643                         // Allow calling with a single dependency as a string
 644                         if ( typeof dependencies === 'string' ) {
 645                                 dependencies = [dependencies];
 646                         }
 647                         // Resolve entire dependency map
 648                         dependencies = resolve( dependencies );
 649                         // If all dependencies are met, execute ready immediately
 650                         if ( filter( ['ready'], dependencies ).compare( dependencies ) ) {
 651                                 if ( typeof ready === 'function' ) {
 652                                         ready();
 653                                 }
 654                         }
 655                         // If any dependencies have errors execute error immediately
 656                         else if ( filter( ['error'], dependencies ).length ) {
 657                                 if ( typeof error === 'function' ) {
 658                                         error();
 659                                 }
 660                         }
 661                         // Since some dependencies are not yet ready, queue up a request
 662                         else {
 663                                 request( dependencies, ready, error );
 664                         }
 665                 };
 666
 667                 /**
 668                  * Loads an external script or one or more modules for future use
 669                  *
 670                  * @param {mixed} modules either the name of a module, array of modules, or a URL of an external script or style
 671                  * @param {string} type mime-type to use if calling with a URL of an external script or style; acceptable values
 672                  * are "text/css" and "text/javascript"; if no type is provided, text/javascript is assumed
 673                  */
 674                 this.load = function( modules, type ) {
 675                         // Validate input
 676                         if ( typeof modules !== 'object' && typeof modules !== 'string' ) {
 677                                 throw new Error( 'dependencies must be a string or an array, not a ' + typeof dependencies )
 678                         }
 679                         // Allow calling with an external script or single dependency as a string
 680                         if ( typeof modules === 'string' ) {
 681                                 // Support adding arbitrary external scripts
 682                                 if ( modules.substr( 0, 7 ) == 'http://' || modules.substr( 0, 8 ) == 'https://' ) {
 683                                         if ( type === 'text/css' ) {
 684                                                 setTimeout(  function() {
 685                                                         $( 'head' ).append( '<link rel="stylesheet" type="text/css" href="' + modules + '" />' );
 686                                                 }, 0 );
 687                                                 return true;
 688                                         } else if ( type === 'text/javascript' || typeof type === 'undefined' ) {
 689                                                 setTimeout(  function() {
 690                                                         $( 'body' ).append( '<script type="text/javascript" src="' + modules + '"></script>' );
 691                                                 }, 0 );
 692                                                 return true;
 693                                         }
 694                                         // Unknown type
 695                                         return false;
 696                                 }
 697                                 // Called with single module
 698                                 modules = [modules];
 699                         }
 700                         // Resolve entire dependency map
 701                         modules = resolve( modules );
 702                         // If all modules are ready, nothing dependency be done
 703                         if ( filter( ['ready'], modules ).compare( modules ) ) {
 704                                 return true;
 705                         }
 706                         // If any modules have errors return false
 707                         else if ( filter( ['error'], modules ).length ) {
 708                                 return false;
 709                         }
 710                         // Since some modules are not yet ready, queue up a request
 711                         else {
 712                                 request( modules );
 713                                 return true;
 714                         }
 715                 };
 716
 717                 /**
 718                  * Flushes the request queue and begin executing load requests on demand
 719                  */
 720                 this.go = function() {
 721                         suspended = false;
 722                         that.work();
 723                 };
 724
 725                 /**
 726                  * Changes the state of a module
 727                  *
 728                  * @param mixed module string module name or object of module name/state pairs
 729                  * @param string state string state name
 730                  */
 731                 this.state = function( module, state ) {
 732                         if ( typeof module === 'object' ) {
 733                                 for ( var m in module ) {
 734                                         that.state( m, module[m] );
 735                                 }
 736                                 return;
 737                         }
 738                         if ( module in registry ) {
 739                                 registry[module].state = state;
 740                         }
 741                 };
 742
 743                 /**
 744                  * Gets the version of a module
 745                  *
 746                  * @param string module name of module to get version for
 747                  */
 748                 this.version = function( module ) {
 749                         if ( module in registry && 'version' in registry[module] ) {
 750                                 return formatVersionNumber( registry[module].version );
 751                         }
 752                         return null;
 753                 }
 754
 755                 /* Cache document ready status */
 756
 757                 $(document).ready( function() { ready = true; } );
 758         } )();
 759
 760         /* Extension points */
 761
 762         this.util = {};
 763         this.legacy = {};
 764
 765 } )( jQuery );
 766
 767
 768 /* Auto-register from pre-loaded startup scripts */
 769
 770 if ( typeof window['startUp'] === 'function' ) {
 771         window['startUp']();
 772         delete window['startUp'];
 773 }