Don't change global prototype: local utils.indexOf

Auditors: eater

Parser.js

@@ -363,7 +363,7 @@ Parser.prototype.parseNucleus = function(pos) {
         if (group) {
             return new ParseResult(
                 new ParseNode("sizing", {
-                    size: "size" + (sizeFuncs.indexOf(nucleus.type) + 1),
+                    size: "size" + (utils.indexOf(sizeFuncs, nucleus.type) + 1),
                     value: group.result
                 }),
                 group.position);

utils.js

@@ -1,37 +1,22 @@
-// From https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf
+var nativeIndexOf = Array.prototype.indexOf;
-if (!Array.prototype.indexOf) {
+var indexOf = function(list, elem) {
-    Array.prototype.indexOf = function (searchElement, fromIndex) {
+    if (list == null) {
-        if ( this === undefined || this === null ) {
-            throw new TypeError( '"this" is null or not defined' );
-        }
-
-        var length = this.length >>> 0; // Hack to convert object.length to a UInt32
-
-        fromIndex = +fromIndex || 0;
-
-        if (Math.abs(fromIndex) === Infinity) {
-            fromIndex = 0;
-        }
-
-        if (fromIndex < 0) {
-            fromIndex += length;
-            if (fromIndex < 0) {
-                fromIndex = 0;
-            }
-        }
-
-        for (;fromIndex < length; fromIndex++) {
-            if (this[fromIndex] === searchElement) {
-                return fromIndex;
-            }
-        }
-
         return -1;
-    };
+    }
-}
+    if (nativeIndexOf && list.indexOf === nativeIndexOf) {
+        return list.indexOf(elem);
+    }
+    var i = 0, l = list.length;
+    for (; i < l; i++) {
+        if (list[i] === elem) {
+            return i;
+        }
+    }
+    return -1;
+};
 
 var contains = function(list, elem) {
-    return list.indexOf(elem) !== -1;
+    return indexOf(list, elem) !== -1;
 };
 
 var setTextContent;
@@ -53,6 +38,7 @@ function clearNode(node) {
 
 module.exports = {
     contains: contains,
+    indexOf: indexOf,
     setTextContent: setTextContent,
     clearNode: clearNode
 };