sebastian-software/core

/*
==================================================================================================
  Core - JavaScript Foundation
  Copyright 2010-2012 Zynga Inc.
  Copyright 2012-2014 Sebastian Werner
--------------------------------------------------------------------------------------------------
  Via: http://perfectionkills.com/global-eval-what-are-the-options/
==================================================================================================
*/

"use strict";

(function(global)
{
    // if indirect eval executes code globally, use it
    if ((function()
    {
        eval("var Object=1");

        try
        {
            // Does `Object` resolve to a local variable, or to a global, built-in `Object`,
            // reference to which we passed as a first argument?
            return global.eval('Object') === global.Object;
        }
        catch(err)
        {
            // if indirect eval errors out (as allowed per ES3), then just bail out with `false`

            // wpbasti: not needed as it is just check for being falsy and so "undefined" is OK
            // return false;
        }
    })())
    {
        /**
         * Adds a method for executing aribritary script content in global context.
         */
        core.Main.addStatics("global",
        {
            /**
             * {null} Executes the specified script @expression {String} in global context.
             *
             * This emulates the global `execScript` function of Internet Explorer for other browsers.
             * See also: http://msdn.microsoft.com/en-us/library/ms536420(v=vs.85).aspx
             */
            execScript : function(expression)
            {
                global.eval(expression);

                // Always returns null according to MSDN docs
                return null;
            }
        });
    }

    // otherwise, execScript is `undefined` since nothing is returned
})(core.Main.getGlobal());