1 files changed, 33 insertions, 0 deletions
diff --git a/lib/utils.js b/lib/utils.js
new file mode 100644
index 00000000..ef961833
--- /dev/null
+++ b/lib/utils.js
@@ -0,0 +1,33 @@
+var utils = {
+  /*
+   * Takes a dot-notation object string and call the function
+   * that it points to with the correct value for 'this'.
+   */
+  invokeCommandString: function(str, argArray) {
+    var components = str.split('.');
+    var obj = window;
+    for (var i = 0; i < components.length - 1; i++)
+      obj = obj[components[i]];
+    var func = obj[components.pop()];
+    return func.apply(obj, argArray);
+  },
+
+  /*
+   * Takes an array of XPath selectors, adds the necessary namespaces (currently only XHTML), and applies them
+   * to the document root. The namespaceResolver in evaluateXPath should be kept in sync with the namespaces
+   * here.
+   */
+  makeXPath: function(elementArray) {
+    var xpath = [];
+    for (var i in elementArray)
+      xpath.push("//" + elementArray[i], "//xhtml:" + elementArray[i]);
+    return xpath.join(" | ");
+  },
+
+  evaluateXPath: function(xpath, resultType) {
+    function namespaceResolver(namespace) {
+      return namespace == "xhtml" ? "http://www.w3.org/1999/xhtml" : null;
+    }
+    return document.evaluate(xpath, document.documentElement, namespaceResolver, resultType, null);
+  },
+};