[Summary view] [Print] [Text view]

   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 ) );