class.support.js

/*! class.support - v0.1.0 - 2014-12-10
* https://github.com/cuizuoli/class.support
* Copyright (c) 2014 cuizuoli; Licensed MIT */
// Inspired by base2 and Prototype
(function(){
	var initializing = false;
	var fnTest = /xyz/.test(function(){xyz;}) ? /\b_super\b/ : /.*/;

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

	// 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]) ?
				(function(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;
					};
				})(name, prop[name]) : prop[name];
		}

		// 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;
	};

	// namespace support
	window.Class = function(namespace, prototype) {
		var packages = namespace.split('.');
		var o = window;
		for(var i = 0; i < packages.length; i++) {
			if(typeof(o[packages[i]]) == 'undefined') {
				o[packages[i]] = {};
			}
			if(i == packages.length - 1) {
				o[packages[i]] = Class.extend(prototype);
			} else {
				o = o[packages[i]];
			}
		}
	};
})();