seahub/media/aloha-0.22.7/lib/vendor/class.js

/**
 * @overview: Exposes John Resig's Simply JavaScrip Inheritance as a CommonJS
 *            module (see bottom of file).
 */

/* Simple JavaScript Inheritance
 * By John Resig http://ejohn.org/
 * MIT Licensed.
 */
// Inspired by base2 and Prototype
(function(){
  var initializing = false, fnTest = /xyz/.test(function(){xyz;}) ? /\b_super\b/ : /.*/;
  // The base Class implementation (does nothing)
  this.Class = function(){};
  
  // Create a new Class that inherits from this class
  Class.extend = function() {
    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 i = 0; i < arguments.length; i++) {
      var prop = arguments[i];
      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]) ?
          (function(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;
            };
          })(name, prop[name]) :
          prop[name];
      }
    }
    
    // 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.constructor = Class;

    // And make this class extendable
    Class.extend = arguments.callee;
    
    return Class;
  };
})();

// Expose Class as an CommonJS module.
if ( typeof define === 'function') {
	define( 'Class', [], function () { return Class; } );
}