/* Simple JavaScript Inheritance
 * By John Resig http://ejohn.org/
 * MIT Licensed.
 */
/*global Class */
// Inspired by base2 and Prototype
(function(){

    var initializing = false, fnTest = /xyz/.test(function(){xyz;}) ? /\b_super\b/ : /.*/;

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

    // Create a new Class that inherits from this class
    Class.extend = function(prop) {
        var _super = this.prototype, prototype, name;
	
        // Instantiate a base class (but only create the instance,
        // don't run the init constructor)
        initializing = true;
        prototype = new this();
        initializing = false;
	
        // Copy the properties over onto the new prototype
        for (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, ret;
			
			// 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
			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;
    };
})();
