diff -r 000000000000 -r 6474c204b198 dom/xslt/xpath/txNodeSetAdaptor.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/xslt/xpath/txNodeSetAdaptor.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,89 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "txNodeSetAdaptor.h"
+#include "txXPathTreeWalker.h"
+
+txNodeSetAdaptor::txNodeSetAdaptor()
+    : txXPathObjectAdaptor(),
+      mWritable(true)
+{
+}
+
+txNodeSetAdaptor::txNodeSetAdaptor(txNodeSet *aNodeSet)
+    : txXPathObjectAdaptor(aNodeSet),
+      mWritable(false)
+{
+}
+
+NS_IMPL_ISUPPORTS_INHERITED(txNodeSetAdaptor, txXPathObjectAdaptor, txINodeSet)
+
+nsresult
+txNodeSetAdaptor::Init()
+{
+    if (!mValue) {
+        mValue = new txNodeSet(nullptr);
+    }
+
+    return mValue ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
+}
+
+NS_IMETHODIMP
+txNodeSetAdaptor::Item(uint32_t aIndex, nsIDOMNode **aResult)
+{
+    *aResult = nullptr;
+
+    if (aIndex > (uint32_t)NodeSet()->size()) {
+        return NS_ERROR_ILLEGAL_VALUE;
+    }
+
+    return txXPathNativeNode::getNode(NodeSet()->get(aIndex), aResult);
+}
+
+NS_IMETHODIMP
+txNodeSetAdaptor::ItemAsNumber(uint32_t aIndex, double *aResult)
+{
+    if (aIndex > (uint32_t)NodeSet()->size()) {
+        return NS_ERROR_ILLEGAL_VALUE;
+    }
+
+    nsAutoString result;
+    txXPathNodeUtils::appendNodeValue(NodeSet()->get(aIndex), result);
+
+    *aResult = txDouble::toDouble(result);
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+txNodeSetAdaptor::ItemAsString(uint32_t aIndex, nsAString &aResult)
+{
+    if (aIndex > (uint32_t)NodeSet()->size()) {
+        return NS_ERROR_ILLEGAL_VALUE;
+    }
+
+    txXPathNodeUtils::appendNodeValue(NodeSet()->get(aIndex), aResult);
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+txNodeSetAdaptor::GetLength(uint32_t *aLength)
+{
+    *aLength = (uint32_t)NodeSet()->size();
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+txNodeSetAdaptor::Add(nsIDOMNode *aNode)
+{
+    NS_ENSURE_TRUE(mWritable, NS_ERROR_FAILURE);
+
+    nsAutoPtr<txXPathNode> node(txXPathNativeNode::createXPathNode(aNode,
+                                                                   true));
+
+    return node ? NodeSet()->add(*node) : NS_ERROR_OUT_OF_MEMORY;
+}