Private mootator for mooTools 1.2.4

Class.Mutators.Private.js

Class.Mutators.Private = function(private) {
    var Private = {};

    var me = this;
    var imp = me.implement;

    imp.apply(me, ['~', function() {
        var uid = $uid(this);
        private = null;
        delete Private[uid];
    }]);

    me.implement = function(key, value) {
        if ($type(key) == 'string' && $type(value) == 'function') {
            imp.apply(me, [key, function() {
                var uid = $uid(this);
                var priv = Private[uid] || (Private[uid] = $unlink(private));
                var args = $A(arguments);

                args.push(priv);
                var res = value.apply(this, args);
                return res;
            }]);
                        
            return me;
        }
        
        return imp.apply(me, arguments);
    }
};