
// Inspired by John Resig's Simple JavaScript Inheritance
module.exports = (function(){
    var initializing = false,
        fnTest = /xyz/.test(function(){ return "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;

        function method(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;
            };
        }

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

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