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File: oojs.js
/*! * OOjs v1.0.9 * https://www.mediawiki.org/wiki/OOjs * * Copyright 2011-2014 OOjs Team and other contributors. * Released under the MIT license * http://oojs.mit-license.org * * Date: Wed Apr 02 2014 14:20:50 GMT-0700 (PDT) */ ( function ( global ) { 'use strict'; var /** * Namespace for all classes, static methods and static properties. * @class OO * @singleton */ oo = {}, hasOwn = oo.hasOwnProperty, toString = oo.toString; /* Class Methods */ /** * Assert whether a value is a plain object or not. * * @param {Mixed} obj * @return {boolean} */ oo.isPlainObject = function ( obj ) { // Any object or value whose internal [[Class]] property is not "[object Object]" if ( toString.call( obj ) !== '[object Object]' ) { return false; } // The try/catch suppresses exceptions thrown when attempting to access // the "constructor" property of certain host objects suich as window.location // in Firefox < 20 (https://bugzilla.mozilla.org/814622) try { if ( obj.constructor && !hasOwn.call( obj.constructor.prototype, 'isPrototypeOf' ) ) { return false; } } catch ( e ) { return false; } return true; }; /** * Utility to initialize a class for OO inheritance. * * Currently this just initializes an empty static object. * * @param {Function} fn */ oo.initClass = function ( fn ) { fn.static = fn.static || {}; }; /** * Utility for common usage of Object#create for inheriting from one * prototype to another. * * Beware: This redefines the prototype, call before setting your prototypes. * Beware: This redefines the prototype, can only be called once on a function. * If called multiple times on the same function, the previous prototype is lost. * This is how prototypal inheritance works, it can only be one straight chain * (just like classical inheritance in PHP for example). If you need to work with * multiple constructors consider storing an instance of the other constructor in a * property instead, or perhaps use a mixin (see OO.mixinClass). * * function Thing() {} * Thing.prototype.exists = function () {}; * * function Person() { * Person.super.apply( this, arguments ); * } * OO.inheritClass( Person, Thing ); * Person.static.defaultEyeCount = 2; * Person.prototype.walk = function () {}; * * function Jumper() { * Jumper.super.apply( this, arguments ); * } * OO.inheritClass( Jumper, Person ); * Jumper.prototype.jump = function () {}; * * Jumper.static.defaultEyeCount === 2; * var x = new Jumper(); * x.jump(); * x.walk(); * x instanceof Thing && x instanceof Person && x instanceof Jumper; * * @param {Function} targetFn * @param {Function} originFn * @throws {Error} If target already inherits from origin */ oo.inheritClass = function ( targetFn, originFn ) { if ( targetFn.prototype instanceof originFn ) { throw new Error( 'Target already inherits from origin' ); } var targetConstructor = targetFn.prototype.constructor; targetFn.super = originFn; targetFn.prototype = Object.create( originFn.prototype, { // Restore constructor property of targetFn constructor: { value: targetConstructor, enumerable: false, writable: true, configurable: true } } ); // Extend static properties - always initialize both sides oo.initClass( originFn ); targetFn.static = Object.create( originFn.static ); }; /** * Utility to copy over *own* prototype properties of a mixin. * The 'constructor' (whether implicit or explicit) is not copied over. * * This does not create inheritance to the origin. If inheritance is needed * use oo.inheritClass instead. * * Beware: This can redefine a prototype property, call before setting your prototypes. * Beware: Don't call before oo.inheritClass. * * function Foo() {} * function Context() {} * * // Avoid repeating this code * function ContextLazyLoad() {} * ContextLazyLoad.prototype.getContext = function () { * if ( !this.context ) { * this.context = new Context(); * } * return this.context; * }; * * function FooBar() {} * OO.inheritClass( FooBar, Foo ); * OO.mixinClass( FooBar, ContextLazyLoad ); * * @param {Function} targetFn * @param {Function} originFn */ oo.mixinClass = function ( targetFn, originFn ) { var key; // Copy prototype properties for ( key in originFn.prototype ) { if ( key !== 'constructor' && hasOwn.call( originFn.prototype, key ) ) { targetFn.prototype[key] = originFn.prototype[key]; } } // Copy static properties - always initialize both sides oo.initClass( targetFn ); if ( originFn.static ) { for ( key in originFn.static ) { if ( hasOwn.call( originFn.static, key ) ) { targetFn.static[key] = originFn.static[key]; } } } else { oo.initClass( originFn ); } }; /* Object Methods */ /** * Create a new object that is an instance of the same * constructor as the input, inherits from the same object * and contains the same own properties. * * This makes a shallow non-recursive copy of own properties. * To create a recursive copy of plain objects, use #copy. * * var foo = new Person( mom, dad ); * foo.setAge( 21 ); * var foo2 = OO.cloneObject( foo ); * foo.setAge( 22 ); * * // Then * foo2 !== foo; // true * foo2 instanceof Person; // true * foo2.getAge(); // 21 * foo.getAge(); // 22 * * @param {Object} origin * @return {Object} Clone of origin */ oo.cloneObject = function ( origin ) { var key, r; r = Object.create( origin.constructor.prototype ); for ( key in origin ) { if ( hasOwn.call( origin, key ) ) { r[key] = origin[key]; } } return r; }; /** * Get an array of all property values in an object. * * @param {Object} Object to get values from * @return {Array} List of object values */ oo.getObjectValues = function ( obj ) { var key, values; if ( obj !== Object( obj ) ) { throw new TypeError( 'Called on non-object' ); } values = []; for ( key in obj ) { if ( hasOwn.call( obj, key ) ) { values[values.length] = obj[key]; } } return values; }; /** * Recursively compares properties between two objects. * * A false result may be caused by property inequality or by properties in one object missing from * the other. An asymmetrical test may also be performed, which checks only that properties in the * first object are present in the second object, but not the inverse. * * @param {Object} a First object to compare * @param {Object} b Second object to compare * @param {boolean} [asymmetrical] Whether to check only that b contains values from a * @return {boolean} If the objects contain the same values as each other */ oo.compare = function ( a, b, asymmetrical ) { var aValue, bValue, aType, bType, k; if ( a === b ) { return true; } for ( k in a ) { aValue = a[k]; bValue = b[k]; aType = typeof aValue; bType = typeof bValue; if ( aType !== bType || ( ( aType === 'string' || aType === 'number' ) && aValue !== bValue ) || ( aValue === Object( aValue ) && !oo.compare( aValue, bValue, asymmetrical ) ) ) { return false; } } // If the check is not asymmetrical, recursing with the arguments swapped will verify our result return asymmetrical ? true : oo.compare( b, a, true ); }; /** * Create a plain deep copy of any kind of object. * * Copies are deep, and will either be an object or an array depending on `source`. * * @param {Object} source Object to copy * @param {Function} [callback] Applied to leaf values before they added to the clone * @return {Object} Copy of source object */ oo.copy = function ( source, callback ) { var key, sourceValue, sourceType, destination; if ( typeof source.clone === 'function' ) { return source.clone(); } destination = Array.isArray( source ) ? new Array( source.length ) : {}; for ( key in source ) { sourceValue = source[key]; sourceType = typeof sourceValue; if ( Array.isArray( sourceValue ) ) { // Array destination[key] = oo.copy( sourceValue, callback ); } else if ( sourceValue && typeof sourceValue.clone === 'function' ) { // Duck type object with custom clone method destination[key] = callback ? callback( sourceValue.clone() ) : sourceValue.clone(); } else if ( sourceValue && typeof sourceValue.cloneNode === 'function' ) { // DOM Node destination[key] = callback ? callback( sourceValue.cloneNode( true ) ) : sourceValue.cloneNode( true ); } else if ( oo.isPlainObject( sourceValue ) ) { // Plain objects destination[key] = oo.copy( sourceValue, callback ); } else { // Non-plain objects (incl. functions) and primitive values destination[key] = callback ? callback( sourceValue ) : sourceValue; } } return destination; }; /** * Generate a hash of an object based on its name and data. * * Performance optimization: <http://jsperf.com/ve-gethash-201208#/toJson_fnReplacerIfAoForElse> * * To avoid two objects with the same values generating different hashes, we utilize the replacer * argument of JSON.stringify and sort the object by key as it's being serialized. This may or may * not be the fastest way to do this; we should investigate this further. * * Objects and arrays are hashed recursively. When hashing an object that has a .getHash() * function, we call that function and use its return value rather than hashing the object * ourselves. This allows classes to define custom hashing. * * @param {Object} val Object to generate hash for * @return {string} Hash of object */ oo.getHash = function ( val ) { return JSON.stringify( val, oo.getHash.keySortReplacer ); }; /** * Helper function for OO.getHash which sorts objects by key. * * This is a callback passed into JSON.stringify. * * @method getHash_keySortReplacer * @param {string} key Property name of value being replaced * @param {Mixed} val Property value to replace * @return {Mixed} Replacement value */ oo.getHash.keySortReplacer = function ( key, val ) { var normalized, keys, i, len; if ( val && typeof val.getHashObject === 'function' ) { // This object has its own custom hash function, use it val = val.getHashObject(); } if ( !Array.isArray( val ) && Object( val ) === val ) { // Only normalize objects when the key-order is ambiguous // (e.g. any object not an array). normalized = {}; keys = Object.keys( val ).sort(); i = 0; len = keys.length; for ( ; i < len; i += 1 ) { normalized[keys[i]] = val[keys[i]]; } return normalized; // Primitive values and arrays get stable hashes // by default. Lets those be stringified as-is. } else { return val; } }; /** * Compute the union (duplicate-free merge) of a set of arrays. * * Arrays values must be convertable to object keys (strings). * * By building an object (with the values for keys) in parallel with * the array, a new item's existence in the union can be computed faster. * * @param {Array...} arrays Arrays to union * @return {Array} Union of the arrays */ oo.simpleArrayUnion = function () { var i, ilen, arr, j, jlen, obj = {}, result = []; for ( i = 0, ilen = arguments.length; i < ilen; i++ ) { arr = arguments[i]; for ( j = 0, jlen = arr.length; j < jlen; j++ ) { if ( !obj[ arr[j] ] ) { obj[ arr[j] ] = true; result.push( arr[j] ); } } } return result; }; /** * Combine arrays (intersection or difference). * * An intersection checks the item exists in 'b' while difference checks it doesn't. * * Arrays values must be convertable to object keys (strings). * * By building an object (with the values for keys) of 'b' we can * compute the result faster. * * @private * @param {Array} a First array * @param {Array} b Second array * @param {boolean} includeB Whether to items in 'b' * @return {Array} Combination (intersection or difference) of arrays */ function simpleArrayCombine( a, b, includeB ) { var i, ilen, isInB, bObj = {}, result = []; for ( i = 0, ilen = b.length; i < ilen; i++ ) { bObj[ b[i] ] = true; } for ( i = 0, ilen = a.length; i < ilen; i++ ) { isInB = !!bObj[ a[i] ]; if ( isInB === includeB ) { result.push( a[i] ); } } return result; } /** * Compute the intersection of two arrays (items in both arrays). * * Arrays values must be convertable to object keys (strings). * * @param {Array} a First array * @param {Array} b Second array * @return {Array} Intersection of arrays */ oo.simpleArrayIntersection = function ( a, b ) { return simpleArrayCombine( a, b, true ); }; /** * Compute the difference of two arrays (items in 'a' but not 'b'). * * Arrays values must be convertable to object keys (strings). * * @param {Array} a First array * @param {Array} b Second array * @return {Array} Intersection of arrays */ oo.simpleArrayDifference = function ( a, b ) { return simpleArrayCombine( a, b, false ); }; /** * @class OO.EventEmitter * * @constructor */ oo.EventEmitter = function OoEventEmitter() { // Properties /** * Storage of bound event handlers by event name. * * @property */ this.bindings = {}; }; /* Methods */ /** * Add a listener to events of a specific event. * * If the callback/context are already bound to the event, they will not be bound again. * * @param {string} event Type of event to listen to * @param {Function} callback Function to call when event occurs * @param {Array} [args] Arguments to pass to listener, will be prepended to emitted arguments * @param {Object} [context=null] Object to use as context for callback function or call method on * @throws {Error} Listener argument is not a function or method name * @chainable */ oo.EventEmitter.prototype.on = function ( event, callback, args, context ) { var i, bindings, binding; // Validate callback if ( typeof callback !== 'function' ) { throw new Error( 'Invalid callback. Function or method name expected.' ); } // Fallback to null context if ( arguments.length < 4 ) { context = null; } if ( this.bindings.hasOwnProperty( event ) ) { // Check for duplicate callback and context for this event bindings = this.bindings[event]; i = bindings.length; while ( i-- ) { binding = bindings[i]; if ( bindings.callback === callback && bindings.context === context ) { return this; } } } else { // Auto-initialize bindings list bindings = this.bindings[event] = []; } // Add binding bindings.push( { callback: callback, args: args, context: context } ); return this; }; /** * Adds a one-time listener to a specific event. * * @param {string} event Type of event to listen to * @param {Function} listener Listener to call when event occurs * @chainable */ oo.EventEmitter.prototype.once = function ( event, listener ) { var eventEmitter = this; return this.on( event, function listenerWrapper() { eventEmitter.off( event, listenerWrapper ); listener.apply( eventEmitter, Array.prototype.slice.call( arguments, 0 ) ); } ); }; /** * Remove a specific listener from a specific event. * * @param {string} event Type of event to remove listener from * @param {Function} [callback] Listener to remove, omit to remove all * @param {Object} [context=null] Object used context for callback function or method * @chainable * @throws {Error} Listener argument is not a function */ oo.EventEmitter.prototype.off = function ( event, callback, context ) { var i, bindings; if ( arguments.length === 1 ) { // Remove all bindings for event if ( event in this.bindings ) { delete this.bindings[event]; } } else { if ( typeof callback !== 'function' ) { throw new Error( 'Invalid callback. Function expected.' ); } if ( !( event in this.bindings ) || !this.bindings[event].length ) { // No matching bindings return this; } // Fallback to null context if ( arguments.length < 3 ) { context = null; } // Remove matching handlers bindings = this.bindings[event]; i = bindings.length; while ( i-- ) { if ( bindings[i].callback === callback && bindings[i].context === context ) { bindings.splice( i, 1 ); } } // Cleanup if now empty if ( bindings.length === 0 ) { delete this.bindings[event]; } } return this; }; /** * Emit an event. * * TODO: Should this be chainable? What is the usefulness of the boolean * return value here? * * @param {string} event Type of event * @param {Mixed} args First in a list of variadic arguments passed to event handler (optional) * @return {boolean} If event was handled by at least one listener */ oo.EventEmitter.prototype.emit = function ( event ) { var i, len, binding, bindings, args; if ( event in this.bindings ) { // Slicing ensures that we don't get tripped up by event handlers that add/remove bindings bindings = this.bindings[event].slice(); args = Array.prototype.slice.call( arguments, 1 ); for ( i = 0, len = bindings.length; i < len; i++ ) { binding = bindings[i]; binding.callback.apply( binding.context, binding.args ? binding.args.concat( args ) : args ); } return true; } return false; }; /** * Connect event handlers to an object. * * @param {Object} context Object to call methods on when events occur * @param {Object.<string,string>|Object.<string,Function>|Object.<string,Array>} methods List of * event bindings keyed by event name containing either method names, functions or arrays containing * method name or function followed by a list of arguments to be passed to callback before emitted * arguments * @chainable */ oo.EventEmitter.prototype.connect = function ( context, methods ) { var method, callback, args, event; for ( event in methods ) { method = methods[event]; // Allow providing additional args if ( Array.isArray( method ) ) { args = method.slice( 1 ); method = method[0]; } else { args = []; } // Allow callback to be a method name if ( typeof method === 'string' ) { // Validate method if ( !context[method] || typeof context[method] !== 'function' ) { throw new Error( 'Method not found: ' + method ); } // Resolve to function callback = context[method]; } else { callback = method; } // Add binding this.on.apply( this, [ event, callback, args, context ] ); } return this; }; /** * Disconnect event handlers from an object. * * @param {Object} context Object to disconnect methods from * @param {Object.<string,string>|Object.<string,Function>|Object.<string,Array>} [methods] List of * event bindings keyed by event name containing either method names or functions * @chainable */ oo.EventEmitter.prototype.disconnect = function ( context, methods ) { var i, method, callback, event, bindings; if ( methods ) { // Remove specific connections to the context for ( event in methods ) { method = methods[event]; if ( typeof method === 'string' ) { // Validate method if ( !context[method] || typeof context[method] !== 'function' ) { throw new Error( 'Method not found: ' + method ); } // Resolve to function callback = context[method]; } else { callback = method; } this.off( event, callback, context ); } } else { // Remove all connections to the context for ( event in this.bindings ) { bindings = this.bindings[event]; i = bindings.length; while ( i-- ) { if ( bindings[i].context === context ) { this.off( event, bindings[i].callback, context ); } } } } return this; }; /** * @class OO.Registry * @mixins OO.EventEmitter * * @constructor */ oo.Registry = function OoRegistry() { // Mixin constructors oo.EventEmitter.call( this ); // Properties this.registry = {}; }; /* Inheritance */ oo.mixinClass( oo.Registry, oo.EventEmitter ); /* Events */ /** * @event register * @param {string} name * @param {Mixed} data */ /* Methods */ /** * Associate one or more symbolic names with some data. * * Only the base name will be registered, overriding any existing entry with the same base name. * * @param {string|string[]} name Symbolic name or list of symbolic names * @param {Mixed} data Data to associate with symbolic name * @fires register * @throws {Error} Name argument must be a string or array */ oo.Registry.prototype.register = function ( name, data ) { var i, len; if ( typeof name === 'string' ) { this.registry[name] = data; this.emit( 'register', name, data ); } else if ( Array.isArray( name ) ) { for ( i = 0, len = name.length; i < len; i++ ) { this.register( name[i], data ); } } else { throw new Error( 'Name must be a string or array, cannot be a ' + typeof name ); } }; /** * Get data for a given symbolic name. * * Lookups are done using the base name. * * @param {string} name Symbolic name * @return {Mixed|undefined} Data associated with symbolic name */ oo.Registry.prototype.lookup = function ( name ) { return this.registry[name]; }; /** * @class OO.Factory * @extends OO.Registry * * @constructor */ oo.Factory = function OoFactory() { oo.Factory.super.call( this ); // Properties this.entries = []; }; /* Inheritance */ oo.inheritClass( oo.Factory, oo.Registry ); /* Methods */ /** * Register a constructor with the factory. * * Classes must have a static `name` property to be registered. * * function MyClass() {}; * OO.initClass( MyClass ); * // Adds a static property to the class defining a symbolic name * MyClass.static.name = 'mine'; * // Registers class with factory, available via symbolic name 'mine' * factory.register( MyClass ); * * @param {Function} constructor Constructor to use when creating object * @throws {Error} Name must be a string and must not be empty * @throws {Error} Constructor must be a function */ oo.Factory.prototype.register = function ( constructor ) { var name; if ( typeof constructor !== 'function' ) { throw new Error( 'constructor must be a function, cannot be a ' + typeof constructor ); } name = constructor.static && constructor.static.name; if ( typeof name !== 'string' || name === '' ) { throw new Error( 'Name must be a string and must not be empty' ); } this.entries.push( name ); oo.Factory.super.prototype.register.call( this, name, constructor ); }; /** * Create an object based on a name. * * Name is used to look up the constructor to use, while all additional arguments are passed to the * constructor directly, so leaving one out will pass an undefined to the constructor. * * @param {string} name Object name * @param {Mixed...} [args] Arguments to pass to the constructor * @return {Object} The new object * @throws {Error} Unknown object name */ oo.Factory.prototype.create = function ( name ) { var args, obj, constructor; if ( !this.registry.hasOwnProperty( name ) ) { throw new Error( 'No class registered by that name: ' + name ); } constructor = this.registry[name]; // Convert arguments to array and shift the first argument (name) off args = Array.prototype.slice.call( arguments, 1 ); // We can't use the "new" operator with .apply directly because apply needs a // context. So instead just do what "new" does: create an object that inherits from // the constructor's prototype (which also makes it an "instanceof" the constructor), // then invoke the constructor with the object as context, and return it (ignoring // the constructor's return value). obj = Object.create( constructor.prototype ); constructor.apply( obj, args ); return obj; }; /*jshint node:true */ if ( typeof module !== 'undefined' && module.exports ) { module.exports = oo; } else { global.OO = oo; } }( this ) );
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