class.js

/* class implementation for javascript */

var Class = function(parent){
	var klass = function(){
		// call a function with a given _this_ argument and 
		// an array of arguments
		// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function/apply
		this.init.apply(this, arguments);
	};

	if (parent) {
		var subclass = function() { };
		subclass.prototype = parent.prototype;
		klass.prototype = new subclass;
	}

	klass.prototype.init = function(){};

	//Shortcut to access prototype
	klass.fn = klass.prototype;
	klass.fn.parent = klass;
	klass._super = klass.__proto__;
	
	//shortcut to access class
	klass.fn.parent = klass;

	// Adding class properties (static members)
	klass.extend = function(obj) {
		/* aggiunge una funzione di callback
		 * chiamata extended: se è presente,
		 * all'atto dell'inserimento delle
		 * funzioni, questa funzione viene 
		 * richiamata
		 */
		var extended = obj.extended;
		for(var i in obj){
			klass[i] = obj[i];
		}
		//callback function
		if (extended) extended(klass);
	};

	// Adding instance properties
	klass.include = function(obj){
		var included = obj.included;
		for(var i in obj){
			klass.fn[i] = obj[i];
		}
		//callback function
		if (included) included(klass);
	};


	return klass;
};