// ## Simple JavaScript Inheritance
// - By John Resig http://ejohn.org/
// - MIT Licensed.
/* class.js */

// Inspired by base2 and Prototype
(function () {
 var initializing = false,
  fnTest = (/xyz/).test(function () {
   var xyz;
  }) ? (/\bsup\b/) : (/.*/);

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

 // Create a new Class that inherits from this class
 Class.extend = function extend(prop) {
  var sup = this.prototype,
      This = this,
      prototype, name, tmp, ret, func;

  // 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) {   
   if (prop.hasOwnProperty(name)) {
    func = prop[name];

    // Check if we're overwriting an existing function
    prototype[name] = (typeof func === "function") && (typeof sup[name] === "function") && fnTest.test(func) ? (function (name, fn) {
     return function () {
      tmp = this.sup;

      // Add a new .sup() method that is the same method
      // but on the super-class
      this.sup = sup[name];

      // The method only need to be bound temporarily, so we
      // remove it when we're done executing
      ret = fn.apply(this, arguments);
      this.sup = tmp;

      return ret;
     };
    }(name, func)) : func;
   }
  }

  prototype.vars = $.extend(true, {}, this.prototype.vars, prototype.vars); // inherit vars

  // The dummy class constructor
  function Class(vars) {

   if (vars) {
    this.vars = $.extend(true, {}, this.vars, vars); // override this.vars object with passed argument
   }
   
   // 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.constructor = Class;

  // And make this class extendable
  Class.extend = extend;

  return Class;
 };
}());