resources/lib/oojs/oojs.jquery.js

   1 /*!
   2  * OOjs v1.1.1 optimised for jQuery
   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: 2014-09-11T00:40:09Z
  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  * Inherit from prototype to another using Object#create.
  41  *
  42  * Beware: This redefines the prototype, call before setting your prototypes.
  43  *
  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  * Copy over *own* prototype properties of a mixin.
 107  *
 108  * The 'constructor' (whether implicit or explicit) is not copied over.
 109  *
 110  * This does not create inheritance to the origin. If inheritance is needed
 111  * use oo.inheritClass instead.
 112  *
 113  * Beware: This can redefine a prototype property, call before setting your prototypes.
 114  *
 115  * Beware: Don't call before oo.inheritClass.
 116  *
 117  *     function Foo() {}
 118  *     function Context() {}
 119  *
 120  *     // Avoid repeating this code
 121  *     function ContextLazyLoad() {}
 122  *     ContextLazyLoad.prototype.getContext = function () {
 123  *         if ( !this.context ) {
 124  *             this.context = new Context();
 125  *         }
 126  *         return this.context;
 127  *     };
 128  *
 129  *     function FooBar() {}
 130  *     OO.inheritClass( FooBar, Foo );
 131  *     OO.mixinClass( FooBar, ContextLazyLoad );
 132  *
 133  * @param {Function} targetFn
 134  * @param {Function} originFn
 135  */
 136 oo.mixinClass = function ( targetFn, originFn ) {
 137         var key;
 138
 139         // Copy prototype properties
 140         for ( key in originFn.prototype ) {
 141                 if ( key !== 'constructor' && hasOwn.call( originFn.prototype, key ) ) {
 142                         targetFn.prototype[key] = originFn.prototype[key];
 143                 }
 144         }
 145
 146         // Copy static properties - always initialize both sides
 147         oo.initClass( targetFn );
 148         if ( originFn.static ) {
 149                 for ( key in originFn.static ) {
 150                         if ( hasOwn.call( originFn.static, key ) ) {
 151                                 targetFn.static[key] = originFn.static[key];
 152                         }
 153                 }
 154         } else {
 155                 oo.initClass( originFn );
 156         }
 157 };
 158
 159 /* Object Methods */
 160
 161 /**
 162  * Create a new object that is an instance of the same
 163  * constructor as the input, inherits from the same object
 164  * and contains the same own properties.
 165  *
 166  * This makes a shallow non-recursive copy of own properties.
 167  * To create a recursive copy of plain objects, use #copy.
 168  *
 169  *     var foo = new Person( mom, dad );
 170  *     foo.setAge( 21 );
 171  *     var foo2 = OO.cloneObject( foo );
 172  *     foo.setAge( 22 );
 173  *
 174  *     // Then
 175  *     foo2 !== foo; // true
 176  *     foo2 instanceof Person; // true
 177  *     foo2.getAge(); // 21
 178  *     foo.getAge(); // 22
 179  *
 180  * @param {Object} origin
 181  * @return {Object} Clone of origin
 182  */
 183 oo.cloneObject = function ( origin ) {
 184         var key, r;
 185
 186         r = Object.create( origin.constructor.prototype );
 187
 188         for ( key in origin ) {
 189                 if ( hasOwn.call( origin, key ) ) {
 190                         r[key] = origin[key];
 191                 }
 192         }
 193
 194         return r;
 195 };
 196
 197 /**
 198  * Get an array of all property values in an object.
 199  *
 200  * @param {Object} Object to get values from
 201  * @return {Array} List of object values
 202  */
 203 oo.getObjectValues = function ( obj ) {
 204         var key, values;
 205
 206         if ( obj !== Object( obj ) ) {
 207                 throw new TypeError( 'Called on non-object' );
 208         }
 209
 210         values = [];
 211         for ( key in obj ) {
 212                 if ( hasOwn.call( obj, key ) ) {
 213                         values[values.length] = obj[key];
 214                 }
 215         }
 216
 217         return values;
 218 };
 219
 220 /**
 221  * Recursively compare properties between two objects.
 222  *
 223  * A false result may be caused by property inequality or by properties in one object missing from
 224  * the other. An asymmetrical test may also be performed, which checks only that properties in the
 225  * first object are present in the second object, but not the inverse.
 226  *
 227  * If either a or b is null or undefined it will be treated as an empty object.
 228  *
 229  * @param {Object|undefined|null} a First object to compare
 230  * @param {Object|undefined|null} b Second object to compare
 231  * @param {boolean} [asymmetrical] Whether to check only that b contains values from a
 232  * @return {boolean} If the objects contain the same values as each other
 233  */
 234 oo.compare = function ( a, b, asymmetrical ) {
 235         var aValue, bValue, aType, bType, k;
 236
 237         if ( a === b ) {
 238                 return true;
 239         }
 240
 241         a = a || {};
 242         b = b || {};
 243
 244         for ( k in a ) {
 245                 if ( !hasOwn.call( a, k ) ) {
 246                         // Support es3-shim: Without this filter, comparing [] to {} will be false in ES3
 247                         // because the shimmed "forEach" is enumerable and shows up in Array but not Object.
 248                         continue;
 249                 }
 250
 251                 aValue = a[k];
 252                 bValue = b[k];
 253                 aType = typeof aValue;
 254                 bType = typeof bValue;
 255                 if ( aType !== bType ||
 256                         (
 257                                 ( aType === 'string' || aType === 'number' || aType === 'boolean' ) &&
 258                                 aValue !== bValue
 259                         ) ||
 260                         ( aValue === Object( aValue ) && !oo.compare( aValue, bValue, asymmetrical ) ) ) {
 261                         return false;
 262                 }
 263         }
 264         // If the check is not asymmetrical, recursing with the arguments swapped will verify our result
 265         return asymmetrical ? true : oo.compare( b, a, true );
 266 };
 267
 268 /**
 269  * Create a plain deep copy of any kind of object.
 270  *
 271  * Copies are deep, and will either be an object or an array depending on `source`.
 272  *
 273  * @param {Object} source Object to copy
 274  * @param {Function} [leafCallback] Applied to leaf values after they are cloned but before they are added to the clone
 275  * @param {Function} [nodeCallback] Applied to all values before they are cloned.  If the nodeCallback returns a value other than undefined, the returned value is used instead of attempting to clone.
 276  * @return {Object} Copy of source object
 277  */
 278 oo.copy = function ( source, leafCallback, nodeCallback ) {
 279         var key, destination;
 280
 281         if ( nodeCallback ) {
 282                 // Extensibility: check before attempting to clone source.
 283                 destination = nodeCallback( source );
 284                 if ( destination !== undefined ) {
 285                         return destination;
 286                 }
 287         }
 288
 289         if ( Array.isArray( source ) ) {
 290                 // Array (fall through)
 291                 destination = new Array( source.length );
 292         } else if ( source && typeof source.clone === 'function' ) {
 293                 // Duck type object with custom clone method
 294                 return leafCallback ? leafCallback( source.clone() ) : source.clone();
 295         } else if ( source && typeof source.cloneNode === 'function' ) {
 296                 // DOM Node
 297                 return leafCallback ?
 298                         leafCallback( source.cloneNode( true ) ) :
 299                         source.cloneNode( true );
 300         } else if ( oo.isPlainObject( source ) ) {
 301                 // Plain objects (fall through)
 302                 destination = {};
 303         } else {
 304                 // Non-plain objects (incl. functions) and primitive values
 305                 return leafCallback ? leafCallback( source ) : source;
 306         }
 307
 308         // source is an array or a plain object
 309         for ( key in source ) {
 310                 destination[key] = oo.copy( source[key], leafCallback, nodeCallback );
 311         }
 312
 313         // This is an internal node, so we don't apply the leafCallback.
 314         return destination;
 315 };
 316
 317 /**
 318  * Generate a hash of an object based on its name and data.
 319  *
 320  * Performance optimization: <http://jsperf.com/ve-gethash-201208#/toJson_fnReplacerIfAoForElse>
 321  *
 322  * To avoid two objects with the same values generating different hashes, we utilize the replacer
 323  * argument of JSON.stringify and sort the object by key as it's being serialized. This may or may
 324  * not be the fastest way to do this; we should investigate this further.
 325  *
 326  * Objects and arrays are hashed recursively. When hashing an object that has a .getHash()
 327  * function, we call that function and use its return value rather than hashing the object
 328  * ourselves. This allows classes to define custom hashing.
 329  *
 330  * @param {Object} val Object to generate hash for
 331  * @return {string} Hash of object
 332  */
 333 oo.getHash = function ( val ) {
 334         return JSON.stringify( val, oo.getHash.keySortReplacer );
 335 };
 336
 337 /**
 338  * Sort objects by key (helper function for OO.getHash).
 339  *
 340  * This is a callback passed into JSON.stringify.
 341  *
 342  * @method getHash_keySortReplacer
 343  * @param {string} key Property name of value being replaced
 344  * @param {Mixed} val Property value to replace
 345  * @return {Mixed} Replacement value
 346  */
 347 oo.getHash.keySortReplacer = function ( key, val ) {
 348         var normalized, keys, i, len;
 349         if ( val && typeof val.getHashObject === 'function' ) {
 350                 // This object has its own custom hash function, use it
 351                 val = val.getHashObject();
 352         }
 353         if ( !Array.isArray( val ) && Object( val ) === val ) {
 354                 // Only normalize objects when the key-order is ambiguous
 355                 // (e.g. any object not an array).
 356                 normalized = {};
 357                 keys = Object.keys( val ).sort();
 358                 i = 0;
 359                 len = keys.length;
 360                 for ( ; i < len; i += 1 ) {
 361                         normalized[keys[i]] = val[keys[i]];
 362                 }
 363                 return normalized;
 364
 365         // Primitive values and arrays get stable hashes
 366         // by default. Lets those be stringified as-is.
 367         } else {
 368                 return val;
 369         }
 370 };
 371
 372 /**
 373  * Compute the union (duplicate-free merge) of a set of arrays.
 374  *
 375  * Arrays values must be convertable to object keys (strings).
 376  *
 377  * By building an object (with the values for keys) in parallel with
 378  * the array, a new item's existence in the union can be computed faster.
 379  *
 380  * @param {Array...} arrays Arrays to union
 381  * @return {Array} Union of the arrays
 382  */
 383 oo.simpleArrayUnion = function () {
 384         var i, ilen, arr, j, jlen,
 385                 obj = {},
 386                 result = [];
 387
 388         for ( i = 0, ilen = arguments.length; i < ilen; i++ ) {
 389                 arr = arguments[i];
 390                 for ( j = 0, jlen = arr.length; j < jlen; j++ ) {
 391                         if ( !obj[ arr[j] ] ) {
 392                                 obj[ arr[j] ] = true;
 393                                 result.push( arr[j] );
 394                         }
 395                 }
 396         }
 397
 398         return result;
 399 };
 400
 401 /**
 402  * Combine arrays (intersection or difference).
 403  *
 404  * An intersection checks the item exists in 'b' while difference checks it doesn't.
 405  *
 406  * Arrays values must be convertable to object keys (strings).
 407  *
 408  * By building an object (with the values for keys) of 'b' we can
 409  * compute the result faster.
 410  *
 411  * @private
 412  * @param {Array} a First array
 413  * @param {Array} b Second array
 414  * @param {boolean} includeB Whether to items in 'b'
 415  * @return {Array} Combination (intersection or difference) of arrays
 416  */
 417 function simpleArrayCombine( a, b, includeB ) {
 418         var i, ilen, isInB,
 419                 bObj = {},
 420                 result = [];
 421
 422         for ( i = 0, ilen = b.length; i < ilen; i++ ) {
 423                 bObj[ b[i] ] = true;
 424         }
 425
 426         for ( i = 0, ilen = a.length; i < ilen; i++ ) {
 427                 isInB = !!bObj[ a[i] ];
 428                 if ( isInB === includeB ) {
 429                         result.push( a[i] );
 430                 }
 431         }
 432
 433         return result;
 434 }
 435
 436 /**
 437  * Compute the intersection of two arrays (items in both arrays).
 438  *
 439  * Arrays values must be convertable to object keys (strings).
 440  *
 441  * @param {Array} a First array
 442  * @param {Array} b Second array
 443  * @return {Array} Intersection of arrays
 444  */
 445 oo.simpleArrayIntersection = function ( a, b ) {
 446         return simpleArrayCombine( a, b, true );
 447 };
 448
 449 /**
 450  * Compute the difference of two arrays (items in 'a' but not 'b').
 451  *
 452  * Arrays values must be convertable to object keys (strings).
 453  *
 454  * @param {Array} a First array
 455  * @param {Array} b Second array
 456  * @return {Array} Intersection of arrays
 457  */
 458 oo.simpleArrayDifference = function ( a, b ) {
 459         return simpleArrayCombine( a, b, false );
 460 };
 461
 462 /*global $ */
 463
 464 oo.isPlainObject = $.isPlainObject;
 465
 466 /*global hasOwn */
 467
 468 ( function () {
 469
 470         /**
 471          * @class OO.EventEmitter
 472          *
 473          * @constructor
 474          */
 475         oo.EventEmitter = function OoEventEmitter() {
 476                 // Properties
 477
 478                 /**
 479                  * Storage of bound event handlers by event name.
 480                  *
 481                  * @property
 482                  */
 483                 this.bindings = {};
 484         };
 485
 486         oo.initClass( oo.EventEmitter );
 487
 488         /* Private helper functions */
 489
 490         /**
 491          * Validate a function or method call in a context
 492          *
 493          * For a method name, check that it names a function in the context object
 494          *
 495          * @private
 496          * @param {Function|string} method Function or method name
 497          * @param {Mixed} context The context of the call
 498          * @throws {Error} A method name is given but there is no context
 499          * @throws {Error} In the context object, no property exists with the given name
 500          * @throws {Error} In the context object, the named property is not a function
 501          */
 502         function validateMethod( method, context ) {
 503                 // Validate method and context
 504                 if ( typeof method === 'string' ) {
 505                         // Validate method
 506                         if ( context === undefined || context === null ) {
 507                                 throw new Error( 'Method name "' + method + '" has no context.' );
 508                         }
 509                         if ( !( method in context ) ) {
 510                                 // Technically the method does not need to exist yet: it could be
 511                                 // added before call time. But this probably signals a typo.
 512                                 throw new Error( 'Method not found: "' + method + '"' );
 513                         }
 514                         if ( typeof context[method] !== 'function' ) {
 515                                 // Technically the property could be replaced by a function before
 516                                 // call time. But this probably signals a typo.
 517                                 throw new Error( 'Property "' + method + '" is not a function' );
 518                         }
 519                 } else if ( typeof method !== 'function' ) {
 520                         throw new Error( 'Invalid callback. Function or method name expected.' );
 521                 }
 522         }
 523
 524         /* Methods */
 525
 526         /**
 527          * Add a listener to events of a specific event.
 528          *
 529          * The listener can be a function or the string name of a method; if the latter, then the
 530          * name lookup happens at the time the listener is called.
 531          *
 532          * @param {string} event Type of event to listen to
 533          * @param {Function|string} method Function or method name to call when event occurs
 534          * @param {Array} [args] Arguments to pass to listener, will be prepended to emitted arguments
 535          * @param {Object} [context=null] Context object for function or method call
 536          * @throws {Error} Listener argument is not a function or a valid method name
 537          * @chainable
 538          */
 539         oo.EventEmitter.prototype.on = function ( event, method, args, context ) {
 540                 var bindings;
 541
 542                 validateMethod( method, context );
 543
 544                 if ( hasOwn.call( this.bindings, event ) ) {
 545                         bindings = this.bindings[event];
 546                 } else {
 547                         // Auto-initialize bindings list
 548                         bindings = this.bindings[event] = [];
 549                 }
 550                 // Add binding
 551                 bindings.push( {
 552                         method: method,
 553                         args: args,
 554                         context: ( arguments.length < 4 ) ? null : context
 555                 } );
 556                 return this;
 557         };
 558
 559         /**
 560          * Add a one-time listener to a specific event.
 561          *
 562          * @param {string} event Type of event to listen to
 563          * @param {Function} listener Listener to call when event occurs
 564          * @chainable
 565          */
 566         oo.EventEmitter.prototype.once = function ( event, listener ) {
 567                 var eventEmitter = this,
 568                         listenerWrapper = function () {
 569                                 eventEmitter.off( event, listenerWrapper );
 570                                 listener.apply( eventEmitter, Array.prototype.slice.call( arguments, 0 ) );
 571                         };
 572                 return this.on( event, listenerWrapper );
 573         };
 574
 575         /**
 576          * Remove a specific listener from a specific event.
 577          *
 578          * @param {string} event Type of event to remove listener from
 579          * @param {Function|string} [method] Listener to remove. Must be in the same form as was passed
 580          * to "on". Omit to remove all listeners.
 581          * @param {Object} [context=null] Context object function or method call
 582          * @chainable
 583          * @throws {Error} Listener argument is not a function or a valid method name
 584          */
 585         oo.EventEmitter.prototype.off = function ( event, method, context ) {
 586                 var i, bindings;
 587
 588                 if ( arguments.length === 1 ) {
 589                         // Remove all bindings for event
 590                         delete this.bindings[event];
 591                         return this;
 592                 }
 593
 594                 validateMethod( method, context );
 595
 596                 if ( !( event in this.bindings ) || !this.bindings[event].length ) {
 597                         // No matching bindings
 598                         return this;
 599                 }
 600
 601                 // Default to null context
 602                 if ( arguments.length < 3 ) {
 603                         context = null;
 604                 }
 605
 606                 // Remove matching handlers
 607                 bindings = this.bindings[event];
 608                 i = bindings.length;
 609                 while ( i-- ) {
 610                         if ( bindings[i].method === method && bindings[i].context === context ) {
 611                                 bindings.splice( i, 1 );
 612                         }
 613                 }
 614
 615                 // Cleanup if now empty
 616                 if ( bindings.length === 0 ) {
 617                         delete this.bindings[event];
 618                 }
 619                 return this;
 620         };
 621
 622         /**
 623          * Emit an event.
 624          *
 625          * TODO: Should this be chainable? What is the usefulness of the boolean
 626          * return value here?
 627          *
 628          * @param {string} event Type of event
 629          * @param {Mixed} args First in a list of variadic arguments passed to event handler (optional)
 630          * @return {boolean} If event was handled by at least one listener
 631          */
 632         oo.EventEmitter.prototype.emit = function ( event ) {
 633                 var i, len, binding, bindings, args, method;
 634
 635                 if ( event in this.bindings ) {
 636                         // Slicing ensures that we don't get tripped up by event handlers that add/remove bindings
 637                         bindings = this.bindings[event].slice();
 638                         args = Array.prototype.slice.call( arguments, 1 );
 639                         for ( i = 0, len = bindings.length; i < len; i++ ) {
 640                                 binding = bindings[i];
 641                                 if ( typeof binding.method === 'string' ) {
 642                                         // Lookup method by name (late binding)
 643                                         method = binding.context[ binding.method ];
 644                                 } else {
 645                                         method = binding.method;
 646                                 }
 647                                 method.apply(
 648                                         binding.context,
 649                                         binding.args ? binding.args.concat( args ) : args
 650                                 );
 651                         }
 652                         return true;
 653                 }
 654                 return false;
 655         };
 656
 657         /**
 658          * Connect event handlers to an object.
 659          *
 660          * @param {Object} context Object to call methods on when events occur
 661          * @param {Object.<string,string>|Object.<string,Function>|Object.<string,Array>} methods List of
 662          *  event bindings keyed by event name containing either method names, functions or arrays containing
 663          *  method name or function followed by a list of arguments to be passed to callback before emitted
 664          *  arguments
 665          * @chainable
 666          */
 667         oo.EventEmitter.prototype.connect = function ( context, methods ) {
 668                 var method, args, event;
 669
 670                 for ( event in methods ) {
 671                         method = methods[event];
 672                         // Allow providing additional args
 673                         if ( Array.isArray( method ) ) {
 674                                 args = method.slice( 1 );
 675                                 method = method[0];
 676                         } else {
 677                                 args = [];
 678                         }
 679                         // Add binding
 680                         this.on( event, method, args, context );
 681                 }
 682                 return this;
 683         };
 684
 685         /**
 686          * Disconnect event handlers from an object.
 687          *
 688          * @param {Object} context Object to disconnect methods from
 689          * @param {Object.<string,string>|Object.<string,Function>|Object.<string,Array>} [methods] List of
 690          * event bindings keyed by event name. Values can be either method names or functions, but must be
 691          * consistent with those used in the corresponding call to "connect".
 692          * @chainable
 693          */
 694         oo.EventEmitter.prototype.disconnect = function ( context, methods ) {
 695                 var i, event, bindings;
 696
 697                 if ( methods ) {
 698                         // Remove specific connections to the context
 699                         for ( event in methods ) {
 700                                 this.off( event, methods[event], context );
 701                         }
 702                 } else {
 703                         // Remove all connections to the context
 704                         for ( event in this.bindings ) {
 705                                 bindings = this.bindings[event];
 706                                 i = bindings.length;
 707                                 while ( i-- ) {
 708                                         // bindings[i] may have been removed by the previous step's
 709                                         // this.off so check it still exists
 710                                         if ( bindings[i] && bindings[i].context === context ) {
 711                                                 this.off( event, bindings[i].method, context );
 712                                         }
 713                                 }
 714                         }
 715                 }
 716
 717                 return this;
 718         };
 719
 720 }() );
 721
 722 /*global hasOwn */
 723
 724 /**
 725  * @class OO.Registry
 726  * @mixins OO.EventEmitter
 727  *
 728  * @constructor
 729  */
 730 oo.Registry = function OoRegistry() {
 731         // Mixin constructors
 732         oo.EventEmitter.call( this );
 733
 734         // Properties
 735         this.registry = {};
 736 };
 737
 738 /* Inheritance */
 739
 740 oo.mixinClass( oo.Registry, oo.EventEmitter );
 741
 742 /* Events */
 743
 744 /**
 745  * @event register
 746  * @param {string} name
 747  * @param {Mixed} data
 748  */
 749
 750 /* Methods */
 751
 752 /**
 753  * Associate one or more symbolic names with some data.
 754  *
 755  * Only the base name will be registered, overriding any existing entry with the same base name.
 756  *
 757  * @param {string|string[]} name Symbolic name or list of symbolic names
 758  * @param {Mixed} data Data to associate with symbolic name
 759  * @fires register
 760  * @throws {Error} Name argument must be a string or array
 761  */
 762 oo.Registry.prototype.register = function ( name, data ) {
 763         var i, len;
 764         if ( typeof name === 'string' ) {
 765                 this.registry[name] = data;
 766                 this.emit( 'register', name, data );
 767         } else if ( Array.isArray( name ) ) {
 768                 for ( i = 0, len = name.length; i < len; i++ ) {
 769                         this.register( name[i], data );
 770                 }
 771         } else {
 772                 throw new Error( 'Name must be a string or array, cannot be a ' + typeof name );
 773         }
 774 };
 775
 776 /**
 777  * Get data for a given symbolic name.
 778  *
 779  * Lookups are done using the base name.
 780  *
 781  * @param {string} name Symbolic name
 782  * @return {Mixed|undefined} Data associated with symbolic name
 783  */
 784 oo.Registry.prototype.lookup = function ( name ) {
 785         if ( hasOwn.call( this.registry, name ) ) {
 786                 return this.registry[name];
 787         }
 788 };
 789
 790 /**
 791  * @class OO.Factory
 792  * @extends OO.Registry
 793  *
 794  * @constructor
 795  */
 796 oo.Factory = function OoFactory() {
 797         oo.Factory.parent.call( this );
 798
 799         // Properties
 800         this.entries = [];
 801 };
 802
 803 /* Inheritance */
 804
 805 oo.inheritClass( oo.Factory, oo.Registry );
 806
 807 /* Methods */
 808
 809 /**
 810  * Register a constructor with the factory.
 811  *
 812  * Classes must have a static `name` property to be registered.
 813  *
 814  *     function MyClass() {};
 815  *     OO.initClass( MyClass );
 816  *     // Adds a static property to the class defining a symbolic name
 817  *     MyClass.static.name = 'mine';
 818  *     // Registers class with factory, available via symbolic name 'mine'
 819  *     factory.register( MyClass );
 820  *
 821  * @param {Function} constructor Constructor to use when creating object
 822  * @throws {Error} Name must be a string and must not be empty
 823  * @throws {Error} Constructor must be a function
 824  */
 825 oo.Factory.prototype.register = function ( constructor ) {
 826         var name;
 827
 828         if ( typeof constructor !== 'function' ) {
 829                 throw new Error( 'constructor must be a function, cannot be a ' + typeof constructor );
 830         }
 831         name = constructor.static && constructor.static.name;
 832         if ( typeof name !== 'string' || name === '' ) {
 833                 throw new Error( 'Name must be a string and must not be empty' );
 834         }
 835         this.entries.push( name );
 836
 837         oo.Factory.parent.prototype.register.call( this, name, constructor );
 838 };
 839
 840 /**
 841  * Create an object based on a name.
 842  *
 843  * Name is used to look up the constructor to use, while all additional arguments are passed to the
 844  * constructor directly, so leaving one out will pass an undefined to the constructor.
 845  *
 846  * @param {string} name Object name
 847  * @param {Mixed...} [args] Arguments to pass to the constructor
 848  * @return {Object} The new object
 849  * @throws {Error} Unknown object name
 850  */
 851 oo.Factory.prototype.create = function ( name ) {
 852         var args, obj,
 853                 constructor = this.lookup( name );
 854
 855         if ( !constructor ) {
 856                 throw new Error( 'No class registered by that name: ' + name );
 857         }
 858
 859         // Convert arguments to array and shift the first argument (name) off
 860         args = Array.prototype.slice.call( arguments, 1 );
 861
 862         // We can't use the "new" operator with .apply directly because apply needs a
 863         // context. So instead just do what "new" does: create an object that inherits from
 864         // the constructor's prototype (which also makes it an "instanceof" the constructor),
 865         // then invoke the constructor with the object as context, and return it (ignoring
 866         // the constructor's return value).
 867         obj = Object.create( constructor.prototype );
 868         constructor.apply( obj, args );
 869         return obj;
 870 };
 871
 872 /*jshint node:true */
 873 if ( typeof module !== 'undefined' && module.exports ) {
 874         module.exports = oo;
 875 } else {
 876         global.OO = oo;
 877 }
 878
 879 }( this ) );