resources/lib/oojs/oojs.jquery.js

   1 /*!
   2  * OOjs v2.2.2 optimised for jQuery
   3  * https://www.mediawiki.org/wiki/OOjs
   4  *
   5  * Copyright 2011-2018 OOjs Team and other contributors.
   6  * Released under the MIT license
   7  * https://oojs.mit-license.org
   8  *
   9  * Date: 2018-06-14T20:13:14Z
  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         // Optimisation: Local reference to Object.prototype.hasOwnProperty
  24         hasOwn = oo.hasOwnProperty,
  25         toString = oo.toString;
  26
  27 /* Class Methods */
  28
  29 /**
  30  * Utility to initialize a class for OO inheritance.
  31  *
  32  * Currently this just initializes an empty static object.
  33  *
  34  * @param {Function} fn
  35  */
  36 oo.initClass = function ( fn ) {
  37         fn.static = fn.static || {};
  38 };
  39
  40 /**
  41  * Inherit from prototype to another using Object#create.
  42  *
  43  * Beware: This redefines the prototype, call before setting your prototypes.
  44  *
  45  * Beware: This redefines the prototype, can only be called once on a function.
  46  * If called multiple times on the same function, the previous prototype is lost.
  47  * This is how prototypal inheritance works, it can only be one straight chain
  48  * (just like classical inheritance in PHP for example). If you need to work with
  49  * multiple constructors consider storing an instance of the other constructor in a
  50  * property instead, or perhaps use a mixin (see OO.mixinClass).
  51  *
  52  *     function Thing() {}
  53  *     Thing.prototype.exists = function () {};
  54  *
  55  *     function Person() {
  56  *         Person.super.apply( this, arguments );
  57  *     }
  58  *     OO.inheritClass( Person, Thing );
  59  *     Person.static.defaultEyeCount = 2;
  60  *     Person.prototype.walk = function () {};
  61  *
  62  *     function Jumper() {
  63  *         Jumper.super.apply( this, arguments );
  64  *     }
  65  *     OO.inheritClass( Jumper, Person );
  66  *     Jumper.prototype.jump = function () {};
  67  *
  68  *     Jumper.static.defaultEyeCount === 2;
  69  *     var x = new Jumper();
  70  *     x.jump();
  71  *     x.walk();
  72  *     x instanceof Thing && x instanceof Person && x instanceof Jumper;
  73  *
  74  * @param {Function} targetFn
  75  * @param {Function} originFn
  76  * @throws {Error} If target already inherits from origin
  77  */
  78 oo.inheritClass = function ( targetFn, originFn ) {
  79         var targetConstructor;
  80
  81         if ( !originFn ) {
  82                 throw new Error( 'inheritClass: Origin is not a function (actually ' + originFn + ')' );
  83         }
  84         if ( targetFn.prototype instanceof originFn ) {
  85                 throw new Error( 'inheritClass: Target already inherits from origin' );
  86         }
  87
  88         targetConstructor = targetFn.prototype.constructor;
  89
  90         // [DEPRECATED] Provide .parent as alias for code supporting older browsers which
  91         // allows people to comply with their style guide.
  92         targetFn.super = targetFn.parent = originFn;
  93
  94         targetFn.prototype = Object.create( originFn.prototype, {
  95                 // Restore constructor property of targetFn
  96                 constructor: {
  97                         value: targetConstructor,
  98                         enumerable: false,
  99                         writable: true,
 100                         configurable: true
 101                 }
 102         } );
 103
 104         // Extend static properties - always initialize both sides
 105         oo.initClass( originFn );
 106         targetFn.static = Object.create( originFn.static );
 107 };
 108
 109 /**
 110  * Copy over *own* prototype properties of a mixin.
 111  *
 112  * The 'constructor' (whether implicit or explicit) is not copied over.
 113  *
 114  * This does not create inheritance to the origin. If you need inheritance,
 115  * use OO.inheritClass instead.
 116  *
 117  * Beware: This can redefine a prototype property, call before setting your prototypes.
 118  *
 119  * Beware: Don't call before OO.inheritClass.
 120  *
 121  *     function Foo() {}
 122  *     function Context() {}
 123  *
 124  *     // Avoid repeating this code
 125  *     function ContextLazyLoad() {}
 126  *     ContextLazyLoad.prototype.getContext = function () {
 127  *         if ( !this.context ) {
 128  *             this.context = new Context();
 129  *         }
 130  *         return this.context;
 131  *     };
 132  *
 133  *     function FooBar() {}
 134  *     OO.inheritClass( FooBar, Foo );
 135  *     OO.mixinClass( FooBar, ContextLazyLoad );
 136  *
 137  * @param {Function} targetFn
 138  * @param {Function} originFn
 139  */
 140 oo.mixinClass = function ( targetFn, originFn ) {
 141         var key;
 142
 143         if ( !originFn ) {
 144                 throw new Error( 'mixinClass: Origin is not a function (actually ' + originFn + ')' );
 145         }
 146
 147         // Copy prototype properties
 148         for ( key in originFn.prototype ) {
 149                 if ( key !== 'constructor' && hasOwn.call( originFn.prototype, key ) ) {
 150                         targetFn.prototype[ key ] = originFn.prototype[ key ];
 151                 }
 152         }
 153
 154         // Copy static properties - always initialize both sides
 155         oo.initClass( targetFn );
 156         if ( originFn.static ) {
 157                 for ( key in originFn.static ) {
 158                         if ( hasOwn.call( originFn.static, key ) ) {
 159                                 targetFn.static[ key ] = originFn.static[ key ];
 160                         }
 161                 }
 162         } else {
 163                 oo.initClass( originFn );
 164         }
 165 };
 166
 167 /**
 168  * Test whether one class is a subclass of another, without instantiating it.
 169  *
 170  * Every class is considered a subclass of Object and of itself.
 171  *
 172  * @param {Function} testFn The class to be tested
 173  * @param {Function} baseFn The base class
 174  * @return {boolean} Whether testFn is a subclass of baseFn (or equal to it)
 175  */
 176 oo.isSubclass = function ( testFn, baseFn ) {
 177         return testFn === baseFn || testFn.prototype instanceof baseFn;
 178 };
 179
 180 /* Object Methods */
 181
 182 /**
 183  * Get a deeply nested property of an object using variadic arguments, protecting against
 184  * undefined property errors.
 185  *
 186  * `quux = OO.getProp( obj, 'foo', 'bar', 'baz' );` is equivalent to `quux = obj.foo.bar.baz;`
 187  * except that the former protects against JS errors if one of the intermediate properties
 188  * is undefined. Instead of throwing an error, this function will return undefined in
 189  * that case.
 190  *
 191  * @param {Object} obj
 192  * @param {...Mixed} [keys]
 193  * @return {Object|undefined} obj[arguments[1]][arguments[2]].... or undefined
 194  */
 195 oo.getProp = function ( obj ) {
 196         var i,
 197                 retval = obj;
 198         for ( i = 1; i < arguments.length; i++ ) {
 199                 if ( retval === undefined || retval === null ) {
 200                         // Trying to access a property of undefined or null causes an error
 201                         return undefined;
 202                 }
 203                 retval = retval[ arguments[ i ] ];
 204         }
 205         return retval;
 206 };
 207
 208 /**
 209  * Set a deeply nested property of an object using variadic arguments, protecting against
 210  * undefined property errors.
 211  *
 212  * `oo.setProp( obj, 'foo', 'bar', 'baz' );` is equivalent to `obj.foo.bar = baz;` except that
 213  * the former protects against JS errors if one of the intermediate properties is
 214  * undefined. Instead of throwing an error, undefined intermediate properties will be
 215  * initialized to an empty object. If an intermediate property is not an object, or if obj itself
 216  * is not an object, this function will silently abort.
 217  *
 218  * @param {Object} obj
 219  * @param {...Mixed} [keys]
 220  * @param {Mixed} [value]
 221  */
 222 oo.setProp = function ( obj ) {
 223         var i,
 224                 prop = obj;
 225         if ( Object( obj ) !== obj || arguments.length < 2 ) {
 226                 return;
 227         }
 228         for ( i = 1; i < arguments.length - 2; i++ ) {
 229                 if ( prop[ arguments[ i ] ] === undefined ) {
 230                         prop[ arguments[ i ] ] = {};
 231                 }
 232                 if ( Object( prop[ arguments[ i ] ] ) !== prop[ arguments[ i ] ] ) {
 233                         return;
 234                 }
 235                 prop = prop[ arguments[ i ] ];
 236         }
 237         prop[ arguments[ arguments.length - 2 ] ] = arguments[ arguments.length - 1 ];
 238 };
 239
 240 /**
 241  * Delete a deeply nested property of an object using variadic arguments, protecting against
 242  * undefined property errors, and deleting resulting empty objects.
 243  *
 244  * @param {Object} obj
 245  * @param {...Mixed} [keys]
 246  */
 247 oo.deleteProp = function ( obj ) {
 248         var i,
 249                 prop = obj,
 250                 props = [ prop ];
 251         if ( Object( obj ) !== obj || arguments.length < 2 ) {
 252                 return;
 253         }
 254         for ( i = 1; i < arguments.length - 1; i++ ) {
 255                 if ( prop[ arguments[ i ] ] === undefined || Object( prop[ arguments[ i ] ] ) !== prop[ arguments[ i ] ] ) {
 256                         return;
 257                 }
 258                 prop = prop[ arguments[ i ] ];
 259                 props.push( prop );
 260         }
 261         delete prop[ arguments[ i ] ];
 262         // Walk back through props removing any plain empty objects
 263         while ( props.length > 1 && ( prop = props.pop() ) && oo.isPlainObject( prop ) && !Object.keys( prop ).length ) {
 264                 delete props[ props.length - 1 ][ arguments[ props.length ] ];
 265         }
 266 };
 267
 268 /**
 269  * Create a new object that is an instance of the same
 270  * constructor as the input, inherits from the same object
 271  * and contains the same own properties.
 272  *
 273  * This makes a shallow non-recursive copy of own properties.
 274  * To create a recursive copy of plain objects, use #copy.
 275  *
 276  *     var foo = new Person( mom, dad );
 277  *     foo.setAge( 21 );
 278  *     var foo2 = OO.cloneObject( foo );
 279  *     foo.setAge( 22 );
 280  *
 281  *     // Then
 282  *     foo2 !== foo; // true
 283  *     foo2 instanceof Person; // true
 284  *     foo2.getAge(); // 21
 285  *     foo.getAge(); // 22
 286  *
 287  * @param {Object} origin
 288  * @return {Object} Clone of origin
 289  */
 290 oo.cloneObject = function ( origin ) {
 291         var key, r;
 292
 293         r = Object.create( origin.constructor.prototype );
 294
 295         for ( key in origin ) {
 296                 if ( hasOwn.call( origin, key ) ) {
 297                         r[ key ] = origin[ key ];
 298                 }
 299         }
 300
 301         return r;
 302 };
 303
 304 /**
 305  * Get an array of all property values in an object.
 306  *
 307  * @param {Object} obj Object to get values from
 308  * @return {Array} List of object values
 309  */
 310 oo.getObjectValues = function ( obj ) {
 311         var key, values;
 312
 313         if ( obj !== Object( obj ) ) {
 314                 throw new TypeError( 'Called on non-object' );
 315         }
 316
 317         values = [];
 318         for ( key in obj ) {
 319                 if ( hasOwn.call( obj, key ) ) {
 320                         values[ values.length ] = obj[ key ];
 321                 }
 322         }
 323
 324         return values;
 325 };
 326
 327 /**
 328  * Use binary search to locate an element in a sorted array.
 329  *
 330  * searchFunc is given an element from the array. `searchFunc(elem)` must return a number
 331  * above 0 if the element we're searching for is to the right of (has a higher index than) elem,
 332  * below 0 if it is to the left of elem, or zero if it's equal to elem.
 333  *
 334  * To search for a specific value with a comparator function (a `function cmp(a,b)` that returns
 335  * above 0 if `a > b`, below 0 if `a < b`, and 0 if `a == b`), you can use
 336  * `searchFunc = cmp.bind( null, value )`.
 337  *
 338  * @param {Array} arr Array to search in
 339  * @param {Function} searchFunc Search function
 340  * @param {boolean} [forInsertion] If not found, return index where val could be inserted
 341  * @return {number|null} Index where val was found, or null if not found
 342  */
 343 oo.binarySearch = function ( arr, searchFunc, forInsertion ) {
 344         var mid, cmpResult,
 345                 left = 0,
 346                 right = arr.length;
 347         while ( left < right ) {
 348                 // Equivalent to Math.floor( ( left + right ) / 2 ) but much faster
 349                 // eslint-disable-next-line no-bitwise
 350                 mid = ( left + right ) >> 1;
 351                 cmpResult = searchFunc( arr[ mid ] );
 352                 if ( cmpResult < 0 ) {
 353                         right = mid;
 354                 } else if ( cmpResult > 0 ) {
 355                         left = mid + 1;
 356                 } else {
 357                         return mid;
 358                 }
 359         }
 360         return forInsertion ? right : null;
 361 };
 362
 363 /**
 364  * Recursively compare properties between two objects.
 365  *
 366  * A false result may be caused by property inequality or by properties in one object missing from
 367  * the other. An asymmetrical test may also be performed, which checks only that properties in the
 368  * first object are present in the second object, but not the inverse.
 369  *
 370  * If either a or b is null or undefined it will be treated as an empty object.
 371  *
 372  * @param {Object|undefined|null} a First object to compare
 373  * @param {Object|undefined|null} b Second object to compare
 374  * @param {boolean} [asymmetrical] Whether to check only that a's values are equal to b's
 375  *  (i.e. a is a subset of b)
 376  * @return {boolean} If the objects contain the same values as each other
 377  */
 378 oo.compare = function ( a, b, asymmetrical ) {
 379         var aValue, bValue, aType, bType, k;
 380
 381         if ( a === b ) {
 382                 return true;
 383         }
 384
 385         a = a || {};
 386         b = b || {};
 387
 388         if ( typeof a.nodeType === 'number' && typeof a.isEqualNode === 'function' ) {
 389                 return a.isEqualNode( b );
 390         }
 391
 392         for ( k in a ) {
 393                 if ( !hasOwn.call( a, k ) || a[ k ] === undefined || a[ k ] === b[ k ] ) {
 394                         // Ignore undefined values, because there is no conceptual difference between
 395                         // a key that is absent and a key that is present but whose value is undefined.
 396                         continue;
 397                 }
 398
 399                 aValue = a[ k ];
 400                 bValue = b[ k ];
 401                 aType = typeof aValue;
 402                 bType = typeof bValue;
 403                 if ( aType !== bType ||
 404                         (
 405                                 ( aType === 'string' || aType === 'number' || aType === 'boolean' ) &&
 406                                 aValue !== bValue
 407                         ) ||
 408                         ( aValue === Object( aValue ) && !oo.compare( aValue, bValue, true ) ) ) {
 409                         return false;
 410                 }
 411         }
 412         // If the check is not asymmetrical, recursing with the arguments swapped will verify our result
 413         return asymmetrical ? true : oo.compare( b, a, true );
 414 };
 415
 416 /**
 417  * Create a plain deep copy of any kind of object.
 418  *
 419  * Copies are deep, and will either be an object or an array depending on `source`.
 420  *
 421  * @param {Object} source Object to copy
 422  * @param {Function} [leafCallback] Applied to leaf values after they are cloned but before they are added to the clone
 423  * @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.
 424  * @return {Object} Copy of source object
 425  */
 426 oo.copy = function ( source, leafCallback, nodeCallback ) {
 427         var key, destination;
 428
 429         if ( nodeCallback ) {
 430                 // Extensibility: check before attempting to clone source.
 431                 destination = nodeCallback( source );
 432                 if ( destination !== undefined ) {
 433                         return destination;
 434                 }
 435         }
 436
 437         if ( Array.isArray( source ) ) {
 438                 // Array (fall through)
 439                 destination = new Array( source.length );
 440         } else if ( source && typeof source.clone === 'function' ) {
 441                 // Duck type object with custom clone method
 442                 return leafCallback ? leafCallback( source.clone() ) : source.clone();
 443         } else if ( source && typeof source.cloneNode === 'function' ) {
 444                 // DOM Node
 445                 return leafCallback ?
 446                         leafCallback( source.cloneNode( true ) ) :
 447                         source.cloneNode( true );
 448         } else if ( oo.isPlainObject( source ) ) {
 449                 // Plain objects (fall through)
 450                 destination = {};
 451         } else {
 452                 // Non-plain objects (incl. functions) and primitive values
 453                 return leafCallback ? leafCallback( source ) : source;
 454         }
 455
 456         // source is an array or a plain object
 457         for ( key in source ) {
 458                 destination[ key ] = oo.copy( source[ key ], leafCallback, nodeCallback );
 459         }
 460
 461         // This is an internal node, so we don't apply the leafCallback.
 462         return destination;
 463 };
 464
 465 /**
 466  * Generate a hash of an object based on its name and data.
 467  *
 468  * Performance optimization: <http://jsperf.com/ve-gethash-201208#/toJson_fnReplacerIfAoForElse>
 469  *
 470  * To avoid two objects with the same values generating different hashes, we utilize the replacer
 471  * argument of JSON.stringify and sort the object by key as it's being serialized. This may or may
 472  * not be the fastest way to do this; we should investigate this further.
 473  *
 474  * Objects and arrays are hashed recursively. When hashing an object that has a .getHash()
 475  * function, we call that function and use its return value rather than hashing the object
 476  * ourselves. This allows classes to define custom hashing.
 477  *
 478  * @param {Object} val Object to generate hash for
 479  * @return {string} Hash of object
 480  */
 481 oo.getHash = function ( val ) {
 482         return JSON.stringify( val, oo.getHash.keySortReplacer );
 483 };
 484
 485 /**
 486  * Sort objects by key (helper function for OO.getHash).
 487  *
 488  * This is a callback passed into JSON.stringify.
 489  *
 490  * @method getHash_keySortReplacer
 491  * @param {string} key Property name of value being replaced
 492  * @param {Mixed} val Property value to replace
 493  * @return {Mixed} Replacement value
 494  */
 495 oo.getHash.keySortReplacer = function ( key, val ) {
 496         var normalized, keys, i, len;
 497         if ( val && typeof val.getHashObject === 'function' ) {
 498                 // This object has its own custom hash function, use it
 499                 val = val.getHashObject();
 500         }
 501         if ( !Array.isArray( val ) && Object( val ) === val ) {
 502                 // Only normalize objects when the key-order is ambiguous
 503                 // (e.g. any object not an array).
 504                 normalized = {};
 505                 keys = Object.keys( val ).sort();
 506                 i = 0;
 507                 len = keys.length;
 508                 for ( ; i < len; i += 1 ) {
 509                         normalized[ keys[ i ] ] = val[ keys[ i ] ];
 510                 }
 511                 return normalized;
 512         } else {
 513                 // Primitive values and arrays get stable hashes
 514                 // by default. Lets those be stringified as-is.
 515                 return val;
 516         }
 517 };
 518
 519 /**
 520  * Get the unique values of an array, removing duplicates
 521  *
 522  * @param {Array} arr Array
 523  * @return {Array} Unique values in array
 524  */
 525 oo.unique = function ( arr ) {
 526         return arr.reduce( function ( result, current ) {
 527                 if ( result.indexOf( current ) === -1 ) {
 528                         result.push( current );
 529                 }
 530                 return result;
 531         }, [] );
 532 };
 533
 534 /**
 535  * Compute the union (duplicate-free merge) of a set of arrays.
 536  *
 537  * Arrays values must be convertable to object keys (strings).
 538  *
 539  * By building an object (with the values for keys) in parallel with
 540  * the array, a new item's existence in the union can be computed faster.
 541  *
 542  * @param {...Array} arrays Arrays to union
 543  * @return {Array} Union of the arrays
 544  */
 545 oo.simpleArrayUnion = function () {
 546         var i, ilen, arr, j, jlen,
 547                 obj = {},
 548                 result = [];
 549
 550         for ( i = 0, ilen = arguments.length; i < ilen; i++ ) {
 551                 arr = arguments[ i ];
 552                 for ( j = 0, jlen = arr.length; j < jlen; j++ ) {
 553                         if ( !obj[ arr[ j ] ] ) {
 554                                 obj[ arr[ j ] ] = true;
 555                                 result.push( arr[ j ] );
 556                         }
 557                 }
 558         }
 559
 560         return result;
 561 };
 562
 563 /**
 564  * Combine arrays (intersection or difference).
 565  *
 566  * An intersection checks the item exists in 'b' while difference checks it doesn't.
 567  *
 568  * Arrays values must be convertable to object keys (strings).
 569  *
 570  * By building an object (with the values for keys) of 'b' we can
 571  * compute the result faster.
 572  *
 573  * @private
 574  * @param {Array} a First array
 575  * @param {Array} b Second array
 576  * @param {boolean} includeB Whether to items in 'b'
 577  * @return {Array} Combination (intersection or difference) of arrays
 578  */
 579 function simpleArrayCombine( a, b, includeB ) {
 580         var i, ilen, isInB,
 581                 bObj = {},
 582                 result = [];
 583
 584         for ( i = 0, ilen = b.length; i < ilen; i++ ) {
 585                 bObj[ b[ i ] ] = true;
 586         }
 587
 588         for ( i = 0, ilen = a.length; i < ilen; i++ ) {
 589                 isInB = !!bObj[ a[ i ] ];
 590                 if ( isInB === includeB ) {
 591                         result.push( a[ i ] );
 592                 }
 593         }
 594
 595         return result;
 596 }
 597
 598 /**
 599  * Compute the intersection of two arrays (items in both arrays).
 600  *
 601  * Arrays values must be convertable to object keys (strings).
 602  *
 603  * @param {Array} a First array
 604  * @param {Array} b Second array
 605  * @return {Array} Intersection of arrays
 606  */
 607 oo.simpleArrayIntersection = function ( a, b ) {
 608         return simpleArrayCombine( a, b, true );
 609 };
 610
 611 /**
 612  * Compute the difference of two arrays (items in 'a' but not 'b').
 613  *
 614  * Arrays values must be convertable to object keys (strings).
 615  *
 616  * @param {Array} a First array
 617  * @param {Array} b Second array
 618  * @return {Array} Intersection of arrays
 619  */
 620 oo.simpleArrayDifference = function ( a, b ) {
 621         return simpleArrayCombine( a, b, false );
 622 };
 623
 624 /* global $ */
 625
 626 oo.isPlainObject = $.isPlainObject;
 627
 628 /* global hasOwn */
 629
 630 ( function () {
 631
 632         /**
 633          * @class OO.EventEmitter
 634          *
 635          * @constructor
 636          */
 637         oo.EventEmitter = function OoEventEmitter() {
 638                 // Properties
 639
 640                 /**
 641                  * Storage of bound event handlers by event name.
 642                  *
 643                  * @property
 644                  */
 645                 this.bindings = {};
 646         };
 647
 648         oo.initClass( oo.EventEmitter );
 649
 650         /* Private helper functions */
 651
 652         /**
 653          * Validate a function or method call in a context
 654          *
 655          * For a method name, check that it names a function in the context object
 656          *
 657          * @private
 658          * @param {Function|string} method Function or method name
 659          * @param {Mixed} context The context of the call
 660          * @throws {Error} A method name is given but there is no context
 661          * @throws {Error} In the context object, no property exists with the given name
 662          * @throws {Error} In the context object, the named property is not a function
 663          */
 664         function validateMethod( method, context ) {
 665                 // Validate method and context
 666                 if ( typeof method === 'string' ) {
 667                         // Validate method
 668                         if ( context === undefined || context === null ) {
 669                                 throw new Error( 'Method name "' + method + '" has no context.' );
 670                         }
 671                         if ( typeof context[ method ] !== 'function' ) {
 672                                 // Technically the property could be replaced by a function before
 673                                 // call time. But this probably signals a typo.
 674                                 throw new Error( 'Property "' + method + '" is not a function' );
 675                         }
 676                 } else if ( typeof method !== 'function' ) {
 677                         throw new Error( 'Invalid callback. Function or method name expected.' );
 678                 }
 679         }
 680
 681         /**
 682          * @private
 683          * @param {OO.EventEmitter} eventEmitter Event emitter
 684          * @param {string} event Event name
 685          * @param {Object} binding
 686          */
 687         function addBinding( eventEmitter, event, binding ) {
 688                 var bindings;
 689                 // Auto-initialize bindings list
 690                 if ( hasOwn.call( eventEmitter.bindings, event ) ) {
 691                         bindings = eventEmitter.bindings[ event ];
 692                 } else {
 693                         bindings = eventEmitter.bindings[ event ] = [];
 694                 }
 695                 // Add binding
 696                 bindings.push( binding );
 697         }
 698
 699         /* Methods */
 700
 701         /**
 702          * Add a listener to events of a specific event.
 703          *
 704          * The listener can be a function or the string name of a method; if the latter, then the
 705          * name lookup happens at the time the listener is called.
 706          *
 707          * @param {string} event Type of event to listen to
 708          * @param {Function|string} method Function or method name to call when event occurs
 709          * @param {Array} [args] Arguments to pass to listener, will be prepended to emitted arguments
 710          * @param {Object} [context=null] Context object for function or method call
 711          * @chainable
 712          * @throws {Error} Listener argument is not a function or a valid method name
 713          */
 714         oo.EventEmitter.prototype.on = function ( event, method, args, context ) {
 715                 validateMethod( method, context );
 716
 717                 // Ensure consistent object shape (optimisation)
 718                 addBinding( this, event, {
 719                         method: method,
 720                         args: args,
 721                         context: ( arguments.length < 4 ) ? null : context,
 722                         once: false
 723                 } );
 724                 return this;
 725         };
 726
 727         /**
 728          * Add a one-time listener to a specific event.
 729          *
 730          * @param {string} event Type of event to listen to
 731          * @param {Function} listener Listener to call when event occurs
 732          * @chainable
 733          */
 734         oo.EventEmitter.prototype.once = function ( event, listener ) {
 735                 validateMethod( listener );
 736
 737                 // Ensure consistent object shape (optimisation)
 738                 addBinding( this, event, {
 739                         method: listener,
 740                         args: undefined,
 741                         context: null,
 742                         once: true
 743                 } );
 744                 return this;
 745         };
 746
 747         /**
 748          * Remove a specific listener from a specific event.
 749          *
 750          * @param {string} event Type of event to remove listener from
 751          * @param {Function|string} [method] Listener to remove. Must be in the same form as was passed
 752          * to "on". Omit to remove all listeners.
 753          * @param {Object} [context=null] Context object function or method call
 754          * @chainable
 755          * @throws {Error} Listener argument is not a function or a valid method name
 756          */
 757         oo.EventEmitter.prototype.off = function ( event, method, context ) {
 758                 var i, bindings;
 759
 760                 if ( arguments.length === 1 ) {
 761                         // Remove all bindings for event
 762                         delete this.bindings[ event ];
 763                         return this;
 764                 }
 765
 766                 validateMethod( method, context );
 767
 768                 if ( !hasOwn.call( this.bindings, event ) || !this.bindings[ event ].length ) {
 769                         // No matching bindings
 770                         return this;
 771                 }
 772
 773                 // Default to null context
 774                 if ( arguments.length < 3 ) {
 775                         context = null;
 776                 }
 777
 778                 // Remove matching handlers
 779                 bindings = this.bindings[ event ];
 780                 i = bindings.length;
 781                 while ( i-- ) {
 782                         if ( bindings[ i ].method === method && bindings[ i ].context === context ) {
 783                                 bindings.splice( i, 1 );
 784                         }
 785                 }
 786
 787                 // Cleanup if now empty
 788                 if ( bindings.length === 0 ) {
 789                         delete this.bindings[ event ];
 790                 }
 791                 return this;
 792         };
 793
 794         /**
 795          * Emit an event.
 796          *
 797          * @param {string} event Type of event
 798          * @param {...Mixed} args First in a list of variadic arguments passed to event handler (optional)
 799          * @return {boolean} Whether the event was handled by at least one listener
 800          */
 801         oo.EventEmitter.prototype.emit = function ( event ) {
 802                 var args = [],
 803                         i, len, binding, bindings, method;
 804
 805                 if ( hasOwn.call( this.bindings, event ) ) {
 806                         // Slicing ensures that we don't get tripped up by event handlers that add/remove bindings
 807                         bindings = this.bindings[ event ].slice();
 808                         for ( i = 1, len = arguments.length; i < len; i++ ) {
 809                                 args.push( arguments[ i ] );
 810                         }
 811                         for ( i = 0, len = bindings.length; i < len; i++ ) {
 812                                 binding = bindings[ i ];
 813                                 if ( typeof binding.method === 'string' ) {
 814                                         // Lookup method by name (late binding)
 815                                         method = binding.context[ binding.method ];
 816                                 } else {
 817                                         method = binding.method;
 818                                 }
 819                                 if ( binding.once ) {
 820                                         // Must unbind before calling method to avoid
 821                                         // any nested triggers.
 822                                         this.off( event, method );
 823                                 }
 824                                 method.apply(
 825                                         binding.context,
 826                                         binding.args ? binding.args.concat( args ) : args
 827                                 );
 828                         }
 829                         return true;
 830                 }
 831                 return false;
 832         };
 833
 834         /**
 835          * Connect event handlers to an object.
 836          *
 837          * @param {Object} context Object to call methods on when events occur
 838          * @param {Object.<string,string>|Object.<string,Function>|Object.<string,Array>} methods List of
 839          *  event bindings keyed by event name containing either method names, functions or arrays containing
 840          *  method name or function followed by a list of arguments to be passed to callback before emitted
 841          *  arguments.
 842          * @chainable
 843          */
 844         oo.EventEmitter.prototype.connect = function ( context, methods ) {
 845                 var method, args, event;
 846
 847                 for ( event in methods ) {
 848                         method = methods[ event ];
 849                         // Allow providing additional args
 850                         if ( Array.isArray( method ) ) {
 851                                 args = method.slice( 1 );
 852                                 method = method[ 0 ];
 853                         } else {
 854                                 args = [];
 855                         }
 856                         // Add binding
 857                         this.on( event, method, args, context );
 858                 }
 859                 return this;
 860         };
 861
 862         /**
 863          * Disconnect event handlers from an object.
 864          *
 865          * @param {Object} context Object to disconnect methods from
 866          * @param {Object.<string,string>|Object.<string,Function>|Object.<string,Array>} [methods] List of
 867          *  event bindings keyed by event name. Values can be either method names, functions or arrays
 868          *  containing a method name.
 869          *  NOTE: To allow matching call sites with connect(), array values are allowed to contain the
 870          *  parameters as well, but only the method name is used to find bindings. Tt is discouraged to
 871          *  have multiple bindings for the same event to the same listener, but if used (and only the
 872          *  parameters vary), disconnecting one variation of (event name, event listener, parameters)
 873          *  will disconnect other variations as well.
 874          * @chainable
 875          */
 876         oo.EventEmitter.prototype.disconnect = function ( context, methods ) {
 877                 var i, event, method, bindings;
 878
 879                 if ( methods ) {
 880                         // Remove specific connections to the context
 881                         for ( event in methods ) {
 882                                 method = methods[ event ];
 883                                 if ( Array.isArray( method ) ) {
 884                                         method = method[ 0 ];
 885                                 }
 886                                 this.off( event, method, context );
 887                         }
 888                 } else {
 889                         // Remove all connections to the context
 890                         for ( event in this.bindings ) {
 891                                 bindings = this.bindings[ event ];
 892                                 i = bindings.length;
 893                                 while ( i-- ) {
 894                                         // bindings[i] may have been removed by the previous step's
 895                                         // this.off so check it still exists
 896                                         if ( bindings[ i ] && bindings[ i ].context === context ) {
 897                                                 this.off( event, bindings[ i ].method, context );
 898                                         }
 899                                 }
 900                         }
 901                 }
 902
 903                 return this;
 904         };
 905
 906 }() );
 907
 908 ( function () {
 909
 910         /**
 911          * Contain and manage a list of OO.EventEmitter items.
 912          *
 913          * Aggregates and manages their events collectively.
 914          *
 915          * This mixin must be used in a class that also mixes in OO.EventEmitter.
 916          *
 917          * @abstract
 918          * @class OO.EmitterList
 919          * @constructor
 920          */
 921         oo.EmitterList = function OoEmitterList() {
 922                 this.items = [];
 923                 this.aggregateItemEvents = {};
 924         };
 925
 926         /* Events */
 927
 928         /**
 929          * Item has been added
 930          *
 931          * @event add
 932          * @param {OO.EventEmitter} item Added item
 933          * @param {number} index Index items were added at
 934          */
 935
 936         /**
 937          * Item has been moved to a new index
 938          *
 939          * @event move
 940          * @param {OO.EventEmitter} item Moved item
 941          * @param {number} index Index item was moved to
 942          * @param {number} oldIndex The original index the item was in
 943          */
 944
 945         /**
 946          * Item has been removed
 947          *
 948          * @event remove
 949          * @param {OO.EventEmitter} item Removed item
 950          * @param {number} index Index the item was removed from
 951          */
 952
 953         /**
 954          * @event clear The list has been cleared of items
 955          */
 956
 957         /* Methods */
 958
 959         /**
 960          * Normalize requested index to fit into the bounds of the given array.
 961          *
 962          * @private
 963          * @static
 964          * @param {Array} arr Given array
 965          * @param {number|undefined} index Requested index
 966          * @return {number} Normalized index
 967          */
 968         function normalizeArrayIndex( arr, index ) {
 969                 return ( index === undefined || index < 0 || index >= arr.length ) ?
 970                         arr.length :
 971                         index;
 972         }
 973
 974         /**
 975          * Get all items.
 976          *
 977          * @return {OO.EventEmitter[]} Items in the list
 978          */
 979         oo.EmitterList.prototype.getItems = function () {
 980                 return this.items.slice( 0 );
 981         };
 982
 983         /**
 984          * Get the index of a specific item.
 985          *
 986          * @param {OO.EventEmitter} item Requested item
 987          * @return {number} Index of the item
 988          */
 989         oo.EmitterList.prototype.getItemIndex = function ( item ) {
 990                 return this.items.indexOf( item );
 991         };
 992
 993         /**
 994          * Get number of items.
 995          *
 996          * @return {number} Number of items in the list
 997          */
 998         oo.EmitterList.prototype.getItemCount = function () {
 999                 return this.items.length;
1000         };
1001
1002         /**
1003          * Check if a list contains no items.
1004          *
1005          * @return {boolean} Group is empty
1006          */
1007         oo.EmitterList.prototype.isEmpty = function () {
1008                 return !this.items.length;
1009         };
1010
1011         /**
1012          * Aggregate the events emitted by the group.
1013          *
1014          * When events are aggregated, the group will listen to all contained items for the event,
1015          * and then emit the event under a new name. The new event will contain an additional leading
1016          * parameter containing the item that emitted the original event. Other arguments emitted from
1017          * the original event are passed through.
1018          *
1019          * @param {Object.<string,string|null>} events An object keyed by the name of the event that should be
1020          *  aggregated  (e.g., ‘click’) and the value of the new name to use (e.g., ‘groupClick’).
1021          *  A `null` value will remove aggregated events.
1022
1023          * @throws {Error} If aggregation already exists
1024          */
1025         oo.EmitterList.prototype.aggregate = function ( events ) {
1026                 var i, item, add, remove, itemEvent, groupEvent;
1027
1028                 for ( itemEvent in events ) {
1029                         groupEvent = events[ itemEvent ];
1030
1031                         // Remove existing aggregated event
1032                         if ( Object.prototype.hasOwnProperty.call( this.aggregateItemEvents, itemEvent ) ) {
1033                                 // Don't allow duplicate aggregations
1034                                 if ( groupEvent ) {
1035                                         throw new Error( 'Duplicate item event aggregation for ' + itemEvent );
1036                                 }
1037                                 // Remove event aggregation from existing items
1038                                 for ( i = 0; i < this.items.length; i++ ) {
1039                                         item = this.items[ i ];
1040                                         if ( item.connect && item.disconnect ) {
1041                                                 remove = {};
1042                                                 remove[ itemEvent ] = [ 'emit', this.aggregateItemEvents[ itemEvent ], item ];
1043                                                 item.disconnect( this, remove );
1044                                         }
1045                                 }
1046                                 // Prevent future items from aggregating event
1047                                 delete this.aggregateItemEvents[ itemEvent ];
1048                         }
1049
1050                         // Add new aggregate event
1051                         if ( groupEvent ) {
1052                                 // Make future items aggregate event
1053                                 this.aggregateItemEvents[ itemEvent ] = groupEvent;
1054                                 // Add event aggregation to existing items
1055                                 for ( i = 0; i < this.items.length; i++ ) {
1056                                         item = this.items[ i ];
1057                                         if ( item.connect && item.disconnect ) {
1058                                                 add = {};
1059                                                 add[ itemEvent ] = [ 'emit', groupEvent, item ];
1060                                                 item.connect( this, add );
1061                                         }
1062                                 }
1063                         }
1064                 }
1065         };
1066
1067         /**
1068          * Add items to the list.
1069          *
1070          * @param {OO.EventEmitter|OO.EventEmitter[]} items Item to add or
1071          *  an array of items to add
1072          * @param {number} [index] Index to add items at. If no index is
1073          *  given, or if the index that is given is invalid, the item
1074          *  will be added at the end of the list.
1075          * @chainable
1076          * @fires add
1077          * @fires move
1078          */
1079         oo.EmitterList.prototype.addItems = function ( items, index ) {
1080                 var i, oldIndex;
1081
1082                 if ( !Array.isArray( items ) ) {
1083                         items = [ items ];
1084                 }
1085
1086                 if ( items.length === 0 ) {
1087                         return this;
1088                 }
1089
1090                 index = normalizeArrayIndex( this.items, index );
1091                 for ( i = 0; i < items.length; i++ ) {
1092                         oldIndex = this.items.indexOf( items[ i ] );
1093                         if ( oldIndex !== -1 ) {
1094                                 // Move item to new index
1095                                 index = this.moveItem( items[ i ], index );
1096                                 this.emit( 'move', items[ i ], index, oldIndex );
1097                         } else {
1098                                 // insert item at index
1099                                 index = this.insertItem( items[ i ], index );
1100                                 this.emit( 'add', items[ i ], index );
1101                         }
1102                         index++;
1103                 }
1104
1105                 return this;
1106         };
1107
1108         /**
1109          * Move an item from its current position to a new index.
1110          *
1111          * The item is expected to exist in the list. If it doesn't,
1112          * the method will throw an exception.
1113          *
1114          * @private
1115          * @param {OO.EventEmitter} item Items to add
1116          * @param {number} newIndex Index to move the item to
1117          * @return {number} The index the item was moved to
1118          * @throws {Error} If item is not in the list
1119          */
1120         oo.EmitterList.prototype.moveItem = function ( item, newIndex ) {
1121                 var existingIndex = this.items.indexOf( item );
1122
1123                 if ( existingIndex === -1 ) {
1124                         throw new Error( 'Item cannot be moved, because it is not in the list.' );
1125                 }
1126
1127                 newIndex = normalizeArrayIndex( this.items, newIndex );
1128
1129                 // Remove the item from the current index
1130                 this.items.splice( existingIndex, 1 );
1131
1132                 // If necessary, adjust new index after removal
1133                 if ( existingIndex < newIndex ) {
1134                         newIndex--;
1135                 }
1136
1137                 // Move the item to the new index
1138                 this.items.splice( newIndex, 0, item );
1139
1140                 return newIndex;
1141         };
1142
1143         /**
1144          * Utility method to insert an item into the list, and
1145          * connect it to aggregate events.
1146          *
1147          * Don't call this directly unless you know what you're doing.
1148          * Use #addItems instead.
1149          *
1150          * This method can be extended in child classes to produce
1151          * different behavior when an item is inserted. For example,
1152          * inserted items may also be attached to the DOM or may
1153          * interact with some other nodes in certain ways. Extending
1154          * this method is allowed, but if overriden, the aggregation
1155          * of events must be preserved, or behavior of emitted events
1156          * will be broken.
1157          *
1158          * If you are extending this method, please make sure the
1159          * parent method is called.
1160          *
1161          * @protected
1162          * @param {OO.EventEmitter} item Items to add
1163          * @param {number} index Index to add items at
1164          * @return {number} The index the item was added at
1165          */
1166         oo.EmitterList.prototype.insertItem = function ( item, index ) {
1167                 var events, event;
1168
1169                 // Add the item to event aggregation
1170                 if ( item.connect && item.disconnect ) {
1171                         events = {};
1172                         for ( event in this.aggregateItemEvents ) {
1173                                 events[ event ] = [ 'emit', this.aggregateItemEvents[ event ], item ];
1174                         }
1175                         item.connect( this, events );
1176                 }
1177
1178                 index = normalizeArrayIndex( this.items, index );
1179
1180                 // Insert into items array
1181                 this.items.splice( index, 0, item );
1182                 return index;
1183         };
1184
1185         /**
1186          * Remove items.
1187          *
1188          * @param {OO.EventEmitter[]} items Items to remove
1189          * @chainable
1190          * @fires remove
1191          */
1192         oo.EmitterList.prototype.removeItems = function ( items ) {
1193                 var i, item, index;
1194
1195                 if ( !Array.isArray( items ) ) {
1196                         items = [ items ];
1197                 }
1198
1199                 if ( items.length === 0 ) {
1200                         return this;
1201                 }
1202
1203                 // Remove specific items
1204                 for ( i = 0; i < items.length; i++ ) {
1205                         item = items[ i ];
1206                         index = this.items.indexOf( item );
1207                         if ( index !== -1 ) {
1208                                 if ( item.connect && item.disconnect ) {
1209                                         // Disconnect all listeners from the item
1210                                         item.disconnect( this );
1211                                 }
1212                                 this.items.splice( index, 1 );
1213                                 this.emit( 'remove', item, index );
1214                         }
1215                 }
1216
1217                 return this;
1218         };
1219
1220         /**
1221          * Clear all items
1222          *
1223          * @chainable
1224          * @fires clear
1225          */
1226         oo.EmitterList.prototype.clearItems = function () {
1227                 var i, item,
1228                         cleared = this.items.splice( 0, this.items.length );
1229
1230                 // Disconnect all items
1231                 for ( i = 0; i < cleared.length; i++ ) {
1232                         item = cleared[ i ];
1233                         if ( item.connect && item.disconnect ) {
1234                                 item.disconnect( this );
1235                         }
1236                 }
1237
1238                 this.emit( 'clear' );
1239
1240                 return this;
1241         };
1242
1243 }() );
1244
1245 /**
1246  * Manage a sorted list of OO.EmitterList objects.
1247  *
1248  * The sort order is based on a callback that compares two items. The return value of
1249  * callback( a, b ) must be less than zero if a < b, greater than zero if a > b, and zero
1250  * if a is equal to b. The callback should only return zero if the two objects are
1251  * considered equal.
1252  *
1253  * When an item changes in a way that could affect their sorting behavior, it must
1254  * emit the itemSortChange event. This will cause it to be re-sorted automatically.
1255  *
1256  * This mixin must be used in a class that also mixes in OO.EventEmitter.
1257  *
1258  * @abstract
1259  * @class OO.SortedEmitterList
1260  * @mixins OO.EmitterList
1261  * @constructor
1262  * @param {Function} sortingCallback Callback that compares two items.
1263  */
1264 oo.SortedEmitterList = function OoSortedEmitterList( sortingCallback ) {
1265         // Mixin constructors
1266         oo.EmitterList.call( this );
1267
1268         this.sortingCallback = sortingCallback;
1269
1270         // Listen to sortChange event and make sure
1271         // we re-sort the changed item when that happens
1272         this.aggregate( {
1273                 sortChange: 'itemSortChange'
1274         } );
1275
1276         this.connect( this, {
1277                 itemSortChange: 'onItemSortChange'
1278         } );
1279 };
1280
1281 oo.mixinClass( oo.SortedEmitterList, oo.EmitterList );
1282
1283 /* Events */
1284
1285 /**
1286  * An item has changed properties that affect its sort positioning
1287  * inside the list.
1288  *
1289  * @private
1290  * @event itemSortChange
1291  */
1292
1293 /* Methods */
1294
1295 /**
1296  * Handle a case where an item changed a property that relates
1297  * to its sorted order
1298  *
1299  * @param {OO.EventEmitter} item Item in the list
1300  */
1301 oo.SortedEmitterList.prototype.onItemSortChange = function ( item ) {
1302         // Remove the item
1303         this.removeItems( item );
1304         // Re-add the item so it is in the correct place
1305         this.addItems( item );
1306 };
1307
1308 /**
1309  * Change the sorting callback for this sorted list.
1310  *
1311  * The callback receives two items. The return value of callback(a, b) must be less than zero
1312  * if a < b, greater than zero if a > b, and zero if a is equal to b.
1313  *
1314  * @param {Function} sortingCallback Sorting callback
1315  */
1316 oo.SortedEmitterList.prototype.setSortingCallback = function ( sortingCallback ) {
1317         var items = this.getItems();
1318
1319         this.sortingCallback = sortingCallback;
1320
1321         // Empty the list
1322         this.clearItems();
1323         // Re-add the items in the new order
1324         this.addItems( items );
1325 };
1326
1327 /**
1328  * Add items to the sorted list.
1329  *
1330  * @param {OO.EventEmitter|OO.EventEmitter[]} items Item to add or
1331  *  an array of items to add
1332  * @chainable
1333  */
1334 oo.SortedEmitterList.prototype.addItems = function ( items ) {
1335         var index, i, insertionIndex;
1336
1337         if ( !Array.isArray( items ) ) {
1338                 items = [ items ];
1339         }
1340
1341         if ( items.length === 0 ) {
1342                 return this;
1343         }
1344
1345         for ( i = 0; i < items.length; i++ ) {
1346                 // Find insertion index
1347                 insertionIndex = this.findInsertionIndex( items[ i ] );
1348
1349                 // Check if the item exists using the sorting callback
1350                 // and remove it first if it exists
1351                 if (
1352                         // First make sure the insertion index is not at the end
1353                         // of the list (which means it does not point to any actual
1354                         // items)
1355                         insertionIndex <= this.items.length &&
1356                         // Make sure there actually is an item in this index
1357                         this.items[ insertionIndex ] &&
1358                         // The callback returns 0 if the items are equal
1359                         this.sortingCallback( this.items[ insertionIndex ], items[ i ] ) === 0
1360                 ) {
1361                         // Remove the existing item
1362                         this.removeItems( this.items[ insertionIndex ] );
1363                 }
1364
1365                 // Insert item at the insertion index
1366                 index = this.insertItem( items[ i ], insertionIndex );
1367                 this.emit( 'add', items[ i ], index );
1368         }
1369
1370         return this;
1371 };
1372
1373 /**
1374  * Find the index a given item should be inserted at. If the item is already
1375  * in the list, this will return the index where the item currently is.
1376  *
1377  * @param {OO.EventEmitter} item Items to insert
1378  * @return {number} The index the item should be inserted at
1379  */
1380 oo.SortedEmitterList.prototype.findInsertionIndex = function ( item ) {
1381         var list = this;
1382
1383         return oo.binarySearch(
1384                 this.items,
1385                 // Fake a this.sortingCallback.bind( null, item ) call here
1386                 // otherwise this doesn't pass tests in phantomJS
1387                 function ( otherItem ) {
1388                         return list.sortingCallback( item, otherItem );
1389                 },
1390                 true
1391         );
1392
1393 };
1394
1395 /* global hasOwn */
1396
1397 /**
1398  * A map interface for associating arbitrary data with a symbolic name. Used in
1399  * place of a plain object to provide additional {@link #method-register registration}
1400  * or {@link #method-lookup lookup} functionality.
1401  *
1402  * See <https://www.mediawiki.org/wiki/OOjs/Registries_and_factories>.
1403  *
1404  * @class OO.Registry
1405  * @mixins OO.EventEmitter
1406  *
1407  * @constructor
1408  */
1409 oo.Registry = function OoRegistry() {
1410         // Mixin constructors
1411         oo.EventEmitter.call( this );
1412
1413         // Properties
1414         this.registry = {};
1415 };
1416
1417 /* Inheritance */
1418
1419 oo.mixinClass( oo.Registry, oo.EventEmitter );
1420
1421 /* Events */
1422
1423 /**
1424  * @event register
1425  * @param {string} name
1426  * @param {Mixed} data
1427  */
1428
1429 /**
1430  * @event unregister
1431  * @param {string} name
1432  * @param {Mixed} data Data removed from registry
1433  */
1434
1435 /* Methods */
1436
1437 /**
1438  * Associate one or more symbolic names with some data.
1439  *
1440  * Any existing entry with the same name will be overridden.
1441  *
1442  * @param {string|string[]} name Symbolic name or list of symbolic names
1443  * @param {Mixed} data Data to associate with symbolic name
1444  * @fires register
1445  * @throws {Error} Name argument must be a string or array
1446  */
1447 oo.Registry.prototype.register = function ( name, data ) {
1448         var i, len;
1449         if ( typeof name === 'string' ) {
1450                 this.registry[ name ] = data;
1451                 this.emit( 'register', name, data );
1452         } else if ( Array.isArray( name ) ) {
1453                 for ( i = 0, len = name.length; i < len; i++ ) {
1454                         this.register( name[ i ], data );
1455                 }
1456         } else {
1457                 throw new Error( 'Name must be a string or array, cannot be a ' + typeof name );
1458         }
1459 };
1460
1461 /**
1462  * Remove one or more symbolic names from the registry
1463  *
1464  * @param {string|string[]} name Symbolic name or list of symbolic names
1465  * @fires unregister
1466  * @throws {Error} Name argument must be a string or array
1467  */
1468 oo.Registry.prototype.unregister = function ( name ) {
1469         var i, len, data;
1470         if ( typeof name === 'string' ) {
1471                 data = this.lookup( name );
1472                 if ( data !== undefined ) {
1473                         delete this.registry[ name ];
1474                         this.emit( 'unregister', name, data );
1475                 }
1476         } else if ( Array.isArray( name ) ) {
1477                 for ( i = 0, len = name.length; i < len; i++ ) {
1478                         this.unregister( name[ i ] );
1479                 }
1480         } else {
1481                 throw new Error( 'Name must be a string or array, cannot be a ' + typeof name );
1482         }
1483 };
1484
1485 /**
1486  * Get data for a given symbolic name.
1487  *
1488  * @param {string} name Symbolic name
1489  * @return {Mixed|undefined} Data associated with symbolic name
1490  */
1491 oo.Registry.prototype.lookup = function ( name ) {
1492         if ( hasOwn.call( this.registry, name ) ) {
1493                 return this.registry[ name ];
1494         }
1495 };
1496
1497 /**
1498  * @class OO.Factory
1499  * @extends OO.Registry
1500  *
1501  * @constructor
1502  */
1503 oo.Factory = function OoFactory() {
1504         // Parent constructor
1505         oo.Factory.super.call( this );
1506 };
1507
1508 /* Inheritance */
1509
1510 oo.inheritClass( oo.Factory, oo.Registry );
1511
1512 /* Methods */
1513
1514 /**
1515  * Register a constructor with the factory.
1516  *
1517  * Classes must have a static `name` property to be registered.
1518  *
1519  *     function MyClass() {};
1520  *     OO.initClass( MyClass );
1521  *     // Adds a static property to the class defining a symbolic name
1522  *     MyClass.static.name = 'mine';
1523  *     // Registers class with factory, available via symbolic name 'mine'
1524  *     factory.register( MyClass );
1525  *
1526  * @param {Function} constructor Constructor to use when creating object
1527  * @throws {Error} Name must be a string and must not be empty
1528  * @throws {Error} Constructor must be a function
1529  */
1530 oo.Factory.prototype.register = function ( constructor ) {
1531         var name;
1532
1533         if ( typeof constructor !== 'function' ) {
1534                 throw new Error( 'constructor must be a function, cannot be a ' + typeof constructor );
1535         }
1536         name = constructor.static && constructor.static.name;
1537         if ( typeof name !== 'string' || name === '' ) {
1538                 throw new Error( 'Name must be a string and must not be empty' );
1539         }
1540
1541         // Parent method
1542         oo.Factory.super.prototype.register.call( this, name, constructor );
1543 };
1544
1545 /**
1546  * Unregister a constructor from the factory.
1547  *
1548  * @param {Function} constructor Constructor to unregister
1549  * @throws {Error} Name must be a string and must not be empty
1550  * @throws {Error} Constructor must be a function
1551  */
1552 oo.Factory.prototype.unregister = function ( constructor ) {
1553         var name;
1554
1555         if ( typeof constructor !== 'function' ) {
1556                 throw new Error( 'constructor must be a function, cannot be a ' + typeof constructor );
1557         }
1558         name = constructor.static && constructor.static.name;
1559         if ( typeof name !== 'string' || name === '' ) {
1560                 throw new Error( 'Name must be a string and must not be empty' );
1561         }
1562
1563         // Parent method
1564         oo.Factory.super.prototype.unregister.call( this, name );
1565 };
1566
1567 /**
1568  * Create an object based on a name.
1569  *
1570  * Name is used to look up the constructor to use, while all additional arguments are passed to the
1571  * constructor directly, so leaving one out will pass an undefined to the constructor.
1572  *
1573  * @param {string} name Object name
1574  * @param {...Mixed} [args] Arguments to pass to the constructor
1575  * @return {Object} The new object
1576  * @throws {Error} Unknown object name
1577  */
1578 oo.Factory.prototype.create = function ( name ) {
1579         var obj, i,
1580                 args = [],
1581                 constructor = this.lookup( name );
1582
1583         if ( !constructor ) {
1584                 throw new Error( 'No class registered by that name: ' + name );
1585         }
1586
1587         // Convert arguments to array and shift the first argument (name) off
1588         for ( i = 1; i < arguments.length; i++ ) {
1589                 args.push( arguments[ i ] );
1590         }
1591
1592         // We can't use the "new" operator with .apply directly because apply needs a
1593         // context. So instead just do what "new" does: create an object that inherits from
1594         // the constructor's prototype (which also makes it an "instanceof" the constructor),
1595         // then invoke the constructor with the object as context, and return it (ignoring
1596         // the constructor's return value).
1597         obj = Object.create( constructor.prototype );
1598         constructor.apply( obj, args );
1599         return obj;
1600 };
1601
1602 /* eslint-env node */
1603
1604 /* istanbul ignore next */
1605 if ( typeof module !== 'undefined' && module.exports ) {
1606         module.exports = oo;
1607 } else {
1608         global.OO = oo;
1609 }
1610
1611 }( this ) );