[runmode addon] Reuse existing support code for standalone/node versions of runmode

Author: BrianHung

.gitignore

@@ -8,3 +8,6 @@
 .idea
 *.iml
 /lib/codemirror.js
+/addon/runmode/runmode-standalone.js 
+/addon/runmode/runmode.node.js
+**/.DS_Store

addon/runmode/runmode-standalone.js

@@ -13,11 +13,12 @@
 
 CodeMirror.runMode = function(string, modespec, callback, options) {
   var mode = CodeMirror.getMode(CodeMirror.defaults, modespec);
-  var ie = /MSIE \d/.test(navigator.userAgent);
-  var ie_lt9 = ie && (document.documentMode == null || document.documentMode < 9);
+  var tabSize = (options && options.tabSize) || CodeMirror.defaults.tabSize;
 
+  // Create a tokenizing callback function if passed-in callback is a DOM element.
   if (callback.appendChild) {
-    var tabSize = (options && options.tabSize) || CodeMirror.defaults.tabSize;
+    var ie = /MSIE \d/.test(navigator.userAgent);
+    var ie_lt9 = ie && (document.documentMode == null || document.documentMode < 9);
     var node = callback, col = 0;
     node.innerHTML = "";
     callback = function(text, style) {
@@ -45,7 +46,7 @@ CodeMirror.runMode = function(string, modespec, callback, options) {
           pos = idx + 1;
         }
       }
-
+      // Create a node with token style and append it to the callback DOM element.
       if (style) {
         var sp = node.appendChild(document.createElement("span"));
         sp.className = "cm-" + style.replace(/ +/g, " cm-");