Class.js

/* Simple JavaScript Inheritance
 * By John Resig http://ejohn.org/
 * MIT Licensed.
 */
// Inspired by base2 and Prototype
(function(){
    var initializing = false, fnTest = /xyz/.test(function(){xyz;}) ? /\b_super\b/ : /.*/;
    this.Class = function(){};
    Class.extend = function(prop) {
	var _super = this.prototype;
	initializing = true;
	var prototype = new this();
	initializing = false;
	for (var name in prop) {
	    prototype[name] = typeof prop[name] == "function" && 
		typeof _super[name] == "function" && fnTest.test(prop[name]) ?
		(function(name, fn){
		    return function() {
			var tmp = this._super;
			this._super = _super[name];
			var ret = fn.apply(this, arguments);        
			this._super = tmp;
			return ret;
		    };
		})(name, prop[name]) :
		prop[name];
	}
	function Class() {
	    if ( !initializing && this.init )
		this.init.apply(this, arguments);
	}
	Class.prototype = prototype;
	Class.prototype.constructor = Class;
	Class.extend = arguments.callee;
	return Class;
    };
})();