class.js

/* Simple JavaScript Inheritance
 * By John Resig http://ejohn.org/
 * MIT Licensed.
 */
// Inspired by base2 and Prototype
/* jshint ignore: start */
var initializing = false;

function Class () {

}

// 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;

    // Copy the properties over onto the new prototype
    for (var name in prop) {
      // Check if we're overwriting an existing function
        if (typeof prop[name] == "function" && typeof _super[name] == "function") {
            prototype[name] = (function (fn) {
                return function () {
                    var tmp = this._super, ret;
                    this._super = _super;
                    ret = fn.apply(this, arguments);
                    this._super = tmp;

                    return ret;
                }
            })(prop[name]);
        } else {
            prototype[name] = prop[name];
        }
    }

    prototype._super = this.prototype;

    // 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;
};

module.exports = Class;