angular-class/angular-class.js

An Angular service for creating classes with inheritance. Exposes the `Class` service.

/* Simple JavaScript Inheritance
 * @author John Resig, original author, http://ejohn.org/
 * @author Mark Lagendijk, wrapped in an Angular service, and published on Bower
 * @license MIT
 */
// Inspired by base2 and Prototype
angular.module('Class', [])
	.factory('Class', function(){
		var initializing = false, fnTest = /xyz/.test(function(){
			xyz;
		}) ? /\b_super\b/ : /.*/;

		// The base Class implementation (does nothing)
		function Class(){
		}

		// Create a new Class that inherits from this class
		Class.extend = function(prop){
			var _super = this.prototype;

			// Instantiate a base class (but only create the instance,
			// don't run the init constructor)
			initializing = true;
			var prototype = new this();
			initializing = false;

			// Copy the properties over onto the new prototype
			for(var name in prop){
				// Check if we're overwriting an existing function
				prototype[name] = typeof prop[name] === 'function' && typeof _super[name] === 'function' && fnTest.test(prop[name]) ? createSuper(name, prop[name]) : prop[name];
			}

			function createSuper(name, fn){
				return function(){
					var tmp = this._super;

					// Add a new ._super() method that is the same method
					// but on the super-class
					this._super = _super[name];

					// The method only need to be bound temporarily, so we
					// remove it when we're done executing
					var ret = fn.apply(this, arguments);
					this._super = tmp;

					return ret;
				};
			}

			// The dummy class constructor
			function Class(){
				// All construction is actually done in the init method
				if(!initializing && this.init){
					this.init.apply(this, arguments);
				}
			}

			// Populate our constructed prototype object
			Class.prototype = prototype;

			// Enforce the constructor to be what we expect
			Class.prototype.constructor = Class;

			// And make this class extendable
			Class.extend = arguments.callee;

			return Class;
		};

		return Class;
	});