class.js

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//  ***** BEGIN LICENSE BLOCK *****
// Version: MPL 1.1
// 
// The contents of this file are subject to the Mozilla Public License  
// Version
// 1.1 (the "License"); you may not use this file except in compliance  
// with
// the License. You may obtain a copy of the License at
// http://www.mozilla.org/MPL/
// 
// Software distributed under the License is distributed on an "AS IS"  
// basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied. See the  
// License
// for the specific language governing rights and limitations under the
// License.
// 
// The Original Code is Bespin.
// 
// The Initial Developer of the Original Code is Mozilla.
// Portions created by the Initial Developer are Copyright (C) 2009
// the Initial Developer. All Rights Reserved.
// 
// Contributor(s):
// 
// ***** END LICENSE BLOCK *****
// 

var Class;
(function(){
  var isFn = function(fn) { return typeof fn == "function"; };
  Class = function(){};
  Class.create = function(proto) {
    var k = function(magic) { // call init only if there's no magic cookie
      if (magic != isFn && isFn(this.init)) this.init.apply(this, arguments);
    };
    k.prototype = new this(isFn); // use our private method as magic cookie
    for (key in proto) (function(fn, sfn){ // create a closure
      k.prototype[key] = !isFn(fn) || !isFn(sfn) ? fn : // add _super method
        function() { this._super = sfn; return fn.apply(this, arguments); };
    })(proto[key], k.prototype[key]);
    k.prototype.constructor = k;
    k.extend = this.extend || this.create;
    return k;
  };
})();