Fixed indexOf()-related bug for IE.

lib/sherpa.js

@@ -1,10 +1,41 @@
-if (!Array.prototype.indexOf) {
-  Array.prototype.indexOf = function(obj, start) {
-    for (var i = (start || 0), j = this.length; i < j; i++) {
-      if (this[i] == obj) { return i; }
+if (!Array.prototype.indexOf)
+{
+  Array.prototype.indexOf = function(searchElement /*, fromIndex */)
+  {
+    "use strict";
+
+    if (this === void 0 || this === null)
+      throw new TypeError();
+
+    var t = Object(this);
+    var len = t.length >>> 0;
+    if (len === 0)
+      return -1;
+
+    var n = 0;
+    if (arguments.length > 0)
+    {
+      n = Number(arguments[1]);
+      if (n !== n) // shortcut for verifying if it's NaN
+        n = 0;
+      else if (n !== 0 && n !== (1 / 0) && n !== -(1 / 0))
+        n = (n > 0 || -1) * Math.floor(Math.abs(n));
+    }
+
+    if (n >= len)
+      return -1;
+
+    var k = n >= 0
+          ? n
+          : Math.max(len - Math.abs(n), 0);
+
+    for (; k < len; k++)
+    {
+      if (k in t && t[k] === searchElement)
+        return k;
     }
     return -1;
-  }
+  };
 }
 
 RegExp.escape = function(text) {
@@ -64,7 +95,7 @@ Sherpa = {
     var startIndex = 0;
     var endIndex = 1;
 
-    for (var charIndex in chars) {
+    for (var charIndex = 0; charIndex < chars.length; charIndex++) {
       var c = chars[charIndex];
       if (c == '(') {
         // over current working set, double paths