TamperMonkey script to add variable access to FeatherTest

tampermonkey-feathertest-variable-support.js

// ==UserScript==
// @name        FeatherTest Variable Support
// @namespace   http://mysite
// @include     http*://mysite/*
// @description Add support for FeatherTest variable access. Matt Collinge.
// @version     1.0
// @grant all
// ==/UserScript==

function featherTestSupport() {
     if (typeof(window.addEventListener)!='undefined') window.addEventListener('message',function(event) {
          // Make sure the request is coming from our own site (or FeatherTest)
          if (event.origin !== window.origin) return;
          if (typeof(event.data.action)=='undefined') return;


          // Instead, I used this from StackOverflow; https://stackoverflow.com/questions/11924731/get-object-by-name-as-string-without-eval
          if (event.data.action=='variable') {
               var variableValue = event.data.value.split('.').reduce(function (object, property) {
               return object[property];
          }, unsafeWindow);


          console.log('%c'+event.data.value+' = '+variableValue, 'color:orange');
     }
     },false);
}

featherTestSupport();