resources/lib/oojs/oojs.jquery.js

   1 /*!
   2  * OOjs v1.0.11
   3  * https://www.mediawiki.org/wiki/OOjs
   4  *
   5  * Copyright 2011-2014 OOjs Team and other contributors.
   6  * Released under the MIT license
   7  * http://oojs.mit-license.org
   8  *
   9  * Date: 2014-07-23T20:15:47Z
  10  */
  11 ( function ( global ) {
  12
  13 'use strict';
  14
  15 /*exported toString */
  16 var
  17         /**
  18          * Namespace for all classes, static methods and static properties.
  19          * @class OO
  20          * @singleton
  21          */
  22         oo = {},
  23         hasOwn = oo.hasOwnProperty,
  24         toString = oo.toString;
  25
  26 /* Class Methods */
  27
  28 /**
  29  * Utility to initialize a class for OO inheritance.
  30  *
  31  * Currently this just initializes an empty static object.
  32  *
  33  * @param {Function} fn
  34  */
  35 oo.initClass = function ( fn ) {
  36         fn.static = fn.static || {};
  37 };
  38
  39 /**
  40  * Utility for common usage of Object#create for inheriting from one
  41  * prototype to another.
  42  *
  43  * Beware: This redefines the prototype, call before setting your prototypes.
  44  * Beware: This redefines the prototype, can only be called once on a function.
  45  *  If called multiple times on the same function, the previous prototype is lost.
  46  *  This is how prototypal inheritance works, it can only be one straight chain
  47  *  (just like classical inheritance in PHP for example). If you need to work with
  48  *  multiple constructors consider storing an instance of the other constructor in a
  49  *  property instead, or perhaps use a mixin (see OO.mixinClass).
  50  *
  51  *     function Thing() {}
  52  *     Thing.prototype.exists = function () {};
  53  *
  54  *     function Person() {
  55  *         Person.super.apply( this, arguments );
  56  *     }
  57  *     OO.inheritClass( Person, Thing );
  58  *     Person.static.defaultEyeCount = 2;
  59  *     Person.prototype.walk = function () {};
  60  *
  61  *     function Jumper() {
  62  *         Jumper.super.apply( this, arguments );
  63  *     }
  64  *     OO.inheritClass( Jumper, Person );
  65  *     Jumper.prototype.jump = function () {};
  66  *
  67  *     Jumper.static.defaultEyeCount === 2;
  68  *     var x = new Jumper();
  69  *     x.jump();
  70  *     x.walk();
  71  *     x instanceof Thing && x instanceof Person && x instanceof Jumper;
  72  *
  73  * @param {Function} targetFn
  74  * @param {Function} originFn
  75  * @throws {Error} If target already inherits from origin
  76  */
  77 oo.inheritClass = function ( targetFn, originFn ) {
  78         if ( targetFn.prototype instanceof originFn ) {
  79                 throw new Error( 'Target already inherits from origin' );
  80         }
  81
  82         var targetConstructor = targetFn.prototype.constructor;
  83
  84         // Using ['super'] instead of .super because 'super' is not supported
  85         // by IE 8 and below (bug 63303).
  86         // Provide .parent as alias for code supporting older browsers which
  87         // allows people to comply with their style guide.
  88         targetFn['super'] = targetFn.parent = originFn;
  89
  90         targetFn.prototype = Object.create( originFn.prototype, {
  91                 // Restore constructor property of targetFn
  92                 constructor: {
  93                         value: targetConstructor,
  94                         enumerable: false,
  95                         writable: true,
  96                         configurable: true
  97                 }
  98         } );
  99
 100         // Extend static properties - always initialize both sides
 101         oo.initClass( originFn );
 102         targetFn.static = Object.create( originFn.static );
 103 };
 104
 105 /**
 106  * Utility to copy over *own* prototype properties of a mixin.
 107  * The 'constructor' (whether implicit or explicit) is not copied over.
 108  *
 109  * This does not create inheritance to the origin. If inheritance is needed
 110  * use oo.inheritClass instead.
 111  *
 112  * Beware: This can redefine a prototype property, call before setting your prototypes.
 113  * Beware: Don't call before oo.inheritClass.
 114  *
 115  *     function Foo() {}
 116  *     function Context() {}
 117  *
 118  *     // Avoid repeating this code
 119  *     function ContextLazyLoad() {}
 120  *     ContextLazyLoad.prototype.getContext = function () {
 121  *         if ( !this.context ) {
 122  *             this.context = new Context();
 123  *         }
 124  *         return this.context;
 125  *     };
 126  *
 127  *     function FooBar() {}
 128  *     OO.inheritClass( FooBar, Foo );
 129  *     OO.mixinClass( FooBar, ContextLazyLoad );
 130  *
 131  * @param {Function} targetFn
 132  * @param {Function} originFn
 133  */
 134 oo.mixinClass = function ( targetFn, originFn ) {
 135         var key;
 136
 137         // Copy prototype properties
 138         for ( key in originFn.prototype ) {
 139                 if ( key !== 'constructor' && hasOwn.call( originFn.prototype, key ) ) {
 140                         targetFn.prototype[key] = originFn.prototype[key];
 141                 }
 142         }
 143
 144         // Copy static properties - always initialize both sides
 145         oo.initClass( targetFn );
 146         if ( originFn.static ) {
 147                 for ( key in originFn.static ) {
 148                         if ( hasOwn.call( originFn.static, key ) ) {
 149                                 targetFn.static[key] = originFn.static[key];
 150                         }
 151                 }
 152         } else {
 153                 oo.initClass( originFn );
 154         }
 155 };
 156
 157 /* Object Methods */
 158
 159 /**
 160  * Create a new object that is an instance of the same
 161  * constructor as the input, inherits from the same object
 162  * and contains the same own properties.
 163  *
 164  * This makes a shallow non-recursive copy of own properties.
 165  * To create a recursive copy of plain objects, use #copy.
 166  *
 167  *     var foo = new Person( mom, dad );
 168  *     foo.setAge( 21 );
 169  *     var foo2 = OO.cloneObject( foo );
 170  *     foo.setAge( 22 );
 171  *
 172  *     // Then
 173  *     foo2 !== foo; // true
 174  *     foo2 instanceof Person; // true
 175  *     foo2.getAge(); // 21
 176  *     foo.getAge(); // 22
 177  *
 178  * @param {Object} origin
 179  * @return {Object} Clone of origin
 180  */
 181 oo.cloneObject = function ( origin ) {
 182         var key, r;
 183
 184         r = Object.create( origin.constructor.prototype );
 185
 186         for ( key in origin ) {
 187                 if ( hasOwn.call( origin, key ) ) {
 188                         r[key] = origin[key];
 189                 }
 190         }
 191
 192         return r;
 193 };
 194
 195 /**
 196  * Get an array of all property values in an object.
 197  *
 198  * @param {Object} Object to get values from
 199  * @return {Array} List of object values
 200  */
 201 oo.getObjectValues = function ( obj ) {
 202         var key, values;
 203
 204         if ( obj !== Object( obj ) ) {
 205                 throw new TypeError( 'Called on non-object' );
 206         }
 207
 208         values = [];
 209         for ( key in obj ) {
 210                 if ( hasOwn.call( obj, key ) ) {
 211                         values[values.length] = obj[key];
 212                 }
 213         }
 214
 215         return values;
 216 };
 217
 218 /**
 219  * Recursively compares properties between two objects.
 220  *
 221  * A false result may be caused by property inequality or by properties in one object missing from
 222  * the other. An asymmetrical test may also be performed, which checks only that properties in the
 223  * first object are present in the second object, but not the inverse.
 224  *
 225  * @param {Object} a First object to compare
 226  * @param {Object} b Second object to compare
 227  * @param {boolean} [asymmetrical] Whether to check only that b contains values from a
 228  * @return {boolean} If the objects contain the same values as each other
 229  */
 230 oo.compare = function ( a, b, asymmetrical ) {
 231         var aValue, bValue, aType, bType, k;
 232
 233         if ( a === b ) {
 234                 return true;
 235         }
 236
 237         for ( k in a ) {
 238                 if ( !hasOwn.call( a, k ) ) {
 239                         // Support es3-shim: Without this filter, comparing [] to {} will be false in ES3
 240                         // because the shimmed "forEach" is enumerable and shows up in Array but not Object.
 241                         continue;
 242                 }
 243
 244                 aValue = a[k];
 245                 bValue = b[k];
 246                 aType = typeof aValue;
 247                 bType = typeof bValue;
 248                 if ( aType !== bType ||
 249                         ( ( aType === 'string' || aType === 'number' ) && aValue !== bValue ) ||
 250                         ( aValue === Object( aValue ) && !oo.compare( aValue, bValue, asymmetrical ) ) ) {
 251                         return false;
 252                 }
 253         }
 254         // If the check is not asymmetrical, recursing with the arguments swapped will verify our result
 255         return asymmetrical ? true : oo.compare( b, a, true );
 256 };
 257
 258 /**
 259  * Create a plain deep copy of any kind of object.
 260  *
 261  * Copies are deep, and will either be an object or an array depending on `source`.
 262  *
 263  * @param {Object} source Object to copy
 264  * @param {Function} [callback] Applied to leaf values before they added to the clone
 265  * @return {Object} Copy of source object
 266  */
 267 oo.copy = function ( source, callback ) {
 268         var key, sourceValue, sourceType, destination;
 269
 270         if ( typeof source.clone === 'function' ) {
 271                 return source.clone();
 272         }
 273
 274         destination = Array.isArray( source ) ? new Array( source.length ) : {};
 275
 276         for ( key in source ) {
 277                 sourceValue = source[key];
 278                 sourceType = typeof sourceValue;
 279                 if ( Array.isArray( sourceValue ) ) {
 280                         // Array
 281                         destination[key] = oo.copy( sourceValue, callback );
 282                 } else if ( sourceValue && typeof sourceValue.clone === 'function' ) {
 283                         // Duck type object with custom clone method
 284                         destination[key] = callback ?
 285                                 callback( sourceValue.clone() ) : sourceValue.clone();
 286                 } else if ( sourceValue && typeof sourceValue.cloneNode === 'function' ) {
 287                         // DOM Node
 288                         destination[key] = callback ?
 289                                 callback( sourceValue.cloneNode( true ) ) : sourceValue.cloneNode( true );
 290                 } else if ( oo.isPlainObject( sourceValue ) ) {
 291                         // Plain objects
 292                         destination[key] = oo.copy( sourceValue, callback );
 293                 } else {
 294                         // Non-plain objects (incl. functions) and primitive values
 295                         destination[key] = callback ? callback( sourceValue ) : sourceValue;
 296                 }
 297         }
 298
 299         return destination;
 300 };
 301
 302 /**
 303  * Generate a hash of an object based on its name and data.
 304  *
 305  * Performance optimization: <http://jsperf.com/ve-gethash-201208#/toJson_fnReplacerIfAoForElse>
 306  *
 307  * To avoid two objects with the same values generating different hashes, we utilize the replacer
 308  * argument of JSON.stringify and sort the object by key as it's being serialized. This may or may
 309  * not be the fastest way to do this; we should investigate this further.
 310  *
 311  * Objects and arrays are hashed recursively. When hashing an object that has a .getHash()
 312  * function, we call that function and use its return value rather than hashing the object
 313  * ourselves. This allows classes to define custom hashing.
 314  *
 315  * @param {Object} val Object to generate hash for
 316  * @return {string} Hash of object
 317  */
 318 oo.getHash = function ( val ) {
 319         return JSON.stringify( val, oo.getHash.keySortReplacer );
 320 };
 321
 322 /**
 323  * Helper function for OO.getHash which sorts objects by key.
 324  *
 325  * This is a callback passed into JSON.stringify.
 326  *
 327  * @method getHash_keySortReplacer
 328  * @param {string} key Property name of value being replaced
 329  * @param {Mixed} val Property value to replace
 330  * @return {Mixed} Replacement value
 331  */
 332 oo.getHash.keySortReplacer = function ( key, val ) {
 333         var normalized, keys, i, len;
 334         if ( val && typeof val.getHashObject === 'function' ) {
 335                 // This object has its own custom hash function, use it
 336                 val = val.getHashObject();
 337         }
 338         if ( !Array.isArray( val ) && Object( val ) === val ) {
 339                 // Only normalize objects when the key-order is ambiguous
 340                 // (e.g. any object not an array).
 341                 normalized = {};
 342                 keys = Object.keys( val ).sort();
 343                 i = 0;
 344                 len = keys.length;
 345                 for ( ; i < len; i += 1 ) {
 346                         normalized[keys[i]] = val[keys[i]];
 347                 }
 348                 return normalized;
 349
 350         // Primitive values and arrays get stable hashes
 351         // by default. Lets those be stringified as-is.
 352         } else {
 353                 return val;
 354         }
 355 };
 356
 357 /**
 358  * Compute the union (duplicate-free merge) of a set of arrays.
 359  *
 360  * Arrays values must be convertable to object keys (strings).
 361  *
 362  * By building an object (with the values for keys) in parallel with
 363  * the array, a new item's existence in the union can be computed faster.
 364  *
 365  * @param {Array...} arrays Arrays to union
 366  * @return {Array} Union of the arrays
 367  */
 368 oo.simpleArrayUnion = function () {
 369         var i, ilen, arr, j, jlen,
 370                 obj = {},
 371                 result = [];
 372
 373         for ( i = 0, ilen = arguments.length; i < ilen; i++ ) {
 374                 arr = arguments[i];
 375                 for ( j = 0, jlen = arr.length; j < jlen; j++ ) {
 376                         if ( !obj[ arr[j] ] ) {
 377                                 obj[ arr[j] ] = true;
 378                                 result.push( arr[j] );
 379                         }
 380                 }
 381         }
 382
 383         return result;
 384 };
 385
 386 /**
 387  * Combine arrays (intersection or difference).
 388  *
 389  * An intersection checks the item exists in 'b' while difference checks it doesn't.
 390  *
 391  * Arrays values must be convertable to object keys (strings).
 392  *
 393  * By building an object (with the values for keys) of 'b' we can
 394  * compute the result faster.
 395  *
 396  * @private
 397  * @param {Array} a First array
 398  * @param {Array} b Second array
 399  * @param {boolean} includeB Whether to items in 'b'
 400  * @return {Array} Combination (intersection or difference) of arrays
 401  */
 402 function simpleArrayCombine( a, b, includeB ) {
 403         var i, ilen, isInB,
 404                 bObj = {},
 405                 result = [];
 406
 407         for ( i = 0, ilen = b.length; i < ilen; i++ ) {
 408                 bObj[ b[i] ] = true;
 409         }
 410
 411         for ( i = 0, ilen = a.length; i < ilen; i++ ) {
 412                 isInB = !!bObj[ a[i] ];
 413                 if ( isInB === includeB ) {
 414                         result.push( a[i] );
 415                 }
 416         }
 417
 418         return result;
 419 }
 420
 421 /**
 422  * Compute the intersection of two arrays (items in both arrays).
 423  *
 424  * Arrays values must be convertable to object keys (strings).
 425  *
 426  * @param {Array} a First array
 427  * @param {Array} b Second array
 428  * @return {Array} Intersection of arrays
 429  */
 430 oo.simpleArrayIntersection = function ( a, b ) {
 431         return simpleArrayCombine( a, b, true );
 432 };
 433
 434 /**
 435  * Compute the difference of two arrays (items in 'a' but not 'b').
 436  *
 437  * Arrays values must be convertable to object keys (strings).
 438  *
 439  * @param {Array} a First array
 440  * @param {Array} b Second array
 441  * @return {Array} Intersection of arrays
 442  */
 443 oo.simpleArrayDifference = function ( a, b ) {
 444         return simpleArrayCombine( a, b, false );
 445 };
 446
 447 /*global $ */
 448
 449 oo.isPlainObject = $.isPlainObject;
 450
 451 /*global hasOwn */
 452
 453 /**
 454  * @class OO.EventEmitter
 455  *
 456  * @constructor
 457  */
 458 oo.EventEmitter = function OoEventEmitter() {
 459         // Properties
 460
 461         /**
 462          * Storage of bound event handlers by event name.
 463          *
 464          * @property
 465          */
 466         this.bindings = {};
 467 };
 468
 469 /* Methods */
 470
 471 /**
 472  * Add a listener to events of a specific event.
 473  *
 474  * @param {string} event Type of event to listen to
 475  * @param {Function} callback Function to call when event occurs
 476  * @param {Array} [args] Arguments to pass to listener, will be prepended to emitted arguments
 477  * @param {Object} [context=null] Object to use as context for callback function or call method on
 478  * @throws {Error} Listener argument is not a function or method name
 479  * @chainable
 480  */
 481 oo.EventEmitter.prototype.on = function ( event, callback, args, context ) {
 482         var bindings;
 483
 484         // Validate callback
 485         if ( typeof callback !== 'function' ) {
 486                 throw new Error( 'Invalid callback. Function or method name expected.' );
 487         }
 488         // Fallback to null context
 489         if ( arguments.length < 4 ) {
 490                 context = null;
 491         }
 492         if ( hasOwn.call( this.bindings, event ) ) {
 493                 bindings = this.bindings[event];
 494         } else {
 495                 // Auto-initialize bindings list
 496                 bindings = this.bindings[event] = [];
 497         }
 498         // Add binding
 499         bindings.push( {
 500                 callback: callback,
 501                 args: args,
 502                 context: context
 503         } );
 504         return this;
 505 };
 506
 507 /**
 508  * Adds a one-time listener to a specific event.
 509  *
 510  * @param {string} event Type of event to listen to
 511  * @param {Function} listener Listener to call when event occurs
 512  * @chainable
 513  */
 514 oo.EventEmitter.prototype.once = function ( event, listener ) {
 515         var eventEmitter = this,
 516                 listenerWrapper = function () {
 517                         eventEmitter.off( event, listenerWrapper );
 518                         listener.apply( eventEmitter, Array.prototype.slice.call( arguments, 0 ) );
 519                 };
 520         return this.on( event, listenerWrapper );
 521 };
 522
 523 /**
 524  * Remove a specific listener from a specific event.
 525  *
 526  * @param {string} event Type of event to remove listener from
 527  * @param {Function} [callback] Listener to remove, omit to remove all
 528  * @param {Object} [context=null] Object used context for callback function or method
 529  * @chainable
 530  * @throws {Error} Listener argument is not a function
 531  */
 532 oo.EventEmitter.prototype.off = function ( event, callback, context ) {
 533         var i, bindings;
 534
 535         if ( arguments.length === 1 ) {
 536                 // Remove all bindings for event
 537                 delete this.bindings[event];
 538         } else {
 539                 if ( typeof callback !== 'function' ) {
 540                         throw new Error( 'Invalid callback. Function expected.' );
 541                 }
 542                 if ( !( event in this.bindings ) || !this.bindings[event].length ) {
 543                         // No matching bindings
 544                         return this;
 545                 }
 546                 // Fallback to null context
 547                 if ( arguments.length < 3 ) {
 548                         context = null;
 549                 }
 550                 // Remove matching handlers
 551                 bindings = this.bindings[event];
 552                 i = bindings.length;
 553                 while ( i-- ) {
 554                         if ( bindings[i].callback === callback && bindings[i].context === context ) {
 555                                 bindings.splice( i, 1 );
 556                         }
 557                 }
 558                 // Cleanup if now empty
 559                 if ( bindings.length === 0 ) {
 560                         delete this.bindings[event];
 561                 }
 562         }
 563         return this;
 564 };
 565
 566 /**
 567  * Emit an event.
 568  *
 569  * TODO: Should this be chainable? What is the usefulness of the boolean
 570  * return value here?
 571  *
 572  * @param {string} event Type of event
 573  * @param {Mixed} args First in a list of variadic arguments passed to event handler (optional)
 574  * @return {boolean} If event was handled by at least one listener
 575  */
 576 oo.EventEmitter.prototype.emit = function ( event ) {
 577         var i, len, binding, bindings, args;
 578
 579         if ( event in this.bindings ) {
 580                 // Slicing ensures that we don't get tripped up by event handlers that add/remove bindings
 581                 bindings = this.bindings[event].slice();
 582                 args = Array.prototype.slice.call( arguments, 1 );
 583                 for ( i = 0, len = bindings.length; i < len; i++ ) {
 584                         binding = bindings[i];
 585                         binding.callback.apply(
 586                                 binding.context,
 587                                 binding.args ? binding.args.concat( args ) : args
 588                         );
 589                 }
 590                 return true;
 591         }
 592         return false;
 593 };
 594
 595 /**
 596  * Connect event handlers to an object.
 597  *
 598  * @param {Object} context Object to call methods on when events occur
 599  * @param {Object.<string,string>|Object.<string,Function>|Object.<string,Array>} methods List of
 600  *  event bindings keyed by event name containing either method names, functions or arrays containing
 601  *  method name or function followed by a list of arguments to be passed to callback before emitted
 602  *  arguments
 603  * @chainable
 604  */
 605 oo.EventEmitter.prototype.connect = function ( context, methods ) {
 606         var method, callback, args, event;
 607
 608         for ( event in methods ) {
 609                 method = methods[event];
 610                 // Allow providing additional args
 611                 if ( Array.isArray( method ) ) {
 612                         args = method.slice( 1 );
 613                         method = method[0];
 614                 } else {
 615                         args = [];
 616                 }
 617                 // Allow callback to be a method name
 618                 if ( typeof method === 'string' ) {
 619                         // Validate method
 620                         if ( !context[method] || typeof context[method] !== 'function' ) {
 621                                 throw new Error( 'Method not found: ' + method );
 622                         }
 623                         // Resolve to function
 624                         callback = context[method];
 625                 } else {
 626                         callback = method;
 627                 }
 628                 // Add binding
 629                 this.on.apply( this, [ event, callback, args, context ] );
 630         }
 631         return this;
 632 };
 633
 634 /**
 635  * Disconnect event handlers from an object.
 636  *
 637  * @param {Object} context Object to disconnect methods from
 638  * @param {Object.<string,string>|Object.<string,Function>|Object.<string,Array>} [methods] List of
 639  * event bindings keyed by event name containing either method names or functions
 640  * @chainable
 641  */
 642 oo.EventEmitter.prototype.disconnect = function ( context, methods ) {
 643         var i, method, callback, event, bindings;
 644
 645         if ( methods ) {
 646                 // Remove specific connections to the context
 647                 for ( event in methods ) {
 648                         method = methods[event];
 649                         if ( typeof method === 'string' ) {
 650                                 // Validate method
 651                                 if ( !context[method] || typeof context[method] !== 'function' ) {
 652                                         throw new Error( 'Method not found: ' + method );
 653                                 }
 654                                 // Resolve to function
 655                                 callback = context[method];
 656                         } else {
 657                                 callback = method;
 658                         }
 659                         this.off( event, callback, context );
 660                 }
 661         } else {
 662                 // Remove all connections to the context
 663                 for ( event in this.bindings ) {
 664                         bindings = this.bindings[event];
 665                         i = bindings.length;
 666                         while ( i-- ) {
 667                                 // bindings[i] may have been removed by the previous step's
 668                                 // this.off so check it still exists
 669                                 if ( bindings[i] && bindings[i].context === context ) {
 670                                         this.off( event, bindings[i].callback, context );
 671                                 }
 672                         }
 673                 }
 674         }
 675
 676         return this;
 677 };
 678
 679 /**
 680  * @class OO.Registry
 681  * @mixins OO.EventEmitter
 682  *
 683  * @constructor
 684  */
 685 oo.Registry = function OoRegistry() {
 686         // Mixin constructors
 687         oo.EventEmitter.call( this );
 688
 689         // Properties
 690         this.registry = {};
 691 };
 692
 693 /* Inheritance */
 694
 695 oo.mixinClass( oo.Registry, oo.EventEmitter );
 696
 697 /* Events */
 698
 699 /**
 700  * @event register
 701  * @param {string} name
 702  * @param {Mixed} data
 703  */
 704
 705 /* Methods */
 706
 707 /**
 708  * Associate one or more symbolic names with some data.
 709  *
 710  * Only the base name will be registered, overriding any existing entry with the same base name.
 711  *
 712  * @param {string|string[]} name Symbolic name or list of symbolic names
 713  * @param {Mixed} data Data to associate with symbolic name
 714  * @fires register
 715  * @throws {Error} Name argument must be a string or array
 716  */
 717 oo.Registry.prototype.register = function ( name, data ) {
 718         var i, len;
 719         if ( typeof name === 'string' ) {
 720                 this.registry[name] = data;
 721                 this.emit( 'register', name, data );
 722         } else if ( Array.isArray( name ) ) {
 723                 for ( i = 0, len = name.length; i < len; i++ ) {
 724                         this.register( name[i], data );
 725                 }
 726         } else {
 727                 throw new Error( 'Name must be a string or array, cannot be a ' + typeof name );
 728         }
 729 };
 730
 731 /**
 732  * Get data for a given symbolic name.
 733  *
 734  * Lookups are done using the base name.
 735  *
 736  * @param {string} name Symbolic name
 737  * @return {Mixed|undefined} Data associated with symbolic name
 738  */
 739 oo.Registry.prototype.lookup = function ( name ) {
 740         return this.registry[name];
 741 };
 742
 743 /**
 744  * @class OO.Factory
 745  * @extends OO.Registry
 746  *
 747  * @constructor
 748  */
 749 oo.Factory = function OoFactory() {
 750         oo.Factory.parent.call( this );
 751
 752         // Properties
 753         this.entries = [];
 754 };
 755
 756 /* Inheritance */
 757
 758 oo.inheritClass( oo.Factory, oo.Registry );
 759
 760 /* Methods */
 761
 762 /**
 763  * Register a constructor with the factory.
 764  *
 765  * Classes must have a static `name` property to be registered.
 766  *
 767  *     function MyClass() {};
 768  *     OO.initClass( MyClass );
 769  *     // Adds a static property to the class defining a symbolic name
 770  *     MyClass.static.name = 'mine';
 771  *     // Registers class with factory, available via symbolic name 'mine'
 772  *     factory.register( MyClass );
 773  *
 774  * @param {Function} constructor Constructor to use when creating object
 775  * @throws {Error} Name must be a string and must not be empty
 776  * @throws {Error} Constructor must be a function
 777  */
 778 oo.Factory.prototype.register = function ( constructor ) {
 779         var name;
 780
 781         if ( typeof constructor !== 'function' ) {
 782                 throw new Error( 'constructor must be a function, cannot be a ' + typeof constructor );
 783         }
 784         name = constructor.static && constructor.static.name;
 785         if ( typeof name !== 'string' || name === '' ) {
 786                 throw new Error( 'Name must be a string and must not be empty' );
 787         }
 788         this.entries.push( name );
 789
 790         oo.Factory.parent.prototype.register.call( this, name, constructor );
 791 };
 792
 793 /**
 794  * Create an object based on a name.
 795  *
 796  * Name is used to look up the constructor to use, while all additional arguments are passed to the
 797  * constructor directly, so leaving one out will pass an undefined to the constructor.
 798  *
 799  * @param {string} name Object name
 800  * @param {Mixed...} [args] Arguments to pass to the constructor
 801  * @return {Object} The new object
 802  * @throws {Error} Unknown object name
 803  */
 804 oo.Factory.prototype.create = function ( name ) {
 805         var args, obj, constructor;
 806
 807         if ( !this.registry.hasOwnProperty( name ) ) {
 808                 throw new Error( 'No class registered by that name: ' + name );
 809         }
 810         constructor = this.registry[name];
 811
 812         // Convert arguments to array and shift the first argument (name) off
 813         args = Array.prototype.slice.call( arguments, 1 );
 814
 815         // We can't use the "new" operator with .apply directly because apply needs a
 816         // context. So instead just do what "new" does: create an object that inherits from
 817         // the constructor's prototype (which also makes it an "instanceof" the constructor),
 818         // then invoke the constructor with the object as context, and return it (ignoring
 819         // the constructor's return value).
 820         obj = Object.create( constructor.prototype );
 821         constructor.apply( obj, args );
 822         return obj;
 823 };
 824
 825 /*jshint node:true */
 826 if ( typeof module !== 'undefined' && module.exports ) {
 827         module.exports = oo;
 828 } else {
 829         global.OO = oo;
 830 }
 831
 832 }( this ) );