diff -r 000000000000 -r 6474c204b198 dom/xslt/xpath/txSingleNodeContext.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/xslt/xpath/txSingleNodeContext.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,80 @@
+/* -*- 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/. */
+
+#ifndef __TX_XPATH_SINGLENODE_CONTEXT
+#define __TX_XPATH_SINGLENODE_CONTEXT
+
+#include "mozilla/Attributes.h"
+#include "txIXPathContext.h"
+
+class txSingleNodeContext : public txIEvalContext
+{
+public:
+    txSingleNodeContext(const txXPathNode& aContextNode,
+                        txIMatchContext* aContext)
+        : mNode(aContextNode),
+          mInner(aContext)
+    {
+        NS_ASSERTION(aContext, "txIMatchContext must be given");
+    }
+
+    nsresult getVariable(int32_t aNamespace, nsIAtom* aLName,
+                         txAExprResult*& aResult) MOZ_OVERRIDE
+    {
+        NS_ASSERTION(mInner, "mInner is null!!!");
+        return mInner->getVariable(aNamespace, aLName, aResult);
+    }
+
+    bool isStripSpaceAllowed(const txXPathNode& aNode) MOZ_OVERRIDE
+    {
+        NS_ASSERTION(mInner, "mInner is null!!!");
+        return mInner->isStripSpaceAllowed(aNode);
+    }
+
+    void* getPrivateContext() MOZ_OVERRIDE
+    {
+        NS_ASSERTION(mInner, "mInner is null!!!");
+        return mInner->getPrivateContext();
+    }
+
+    txResultRecycler* recycler() MOZ_OVERRIDE
+    {
+        NS_ASSERTION(mInner, "mInner is null!!!");
+        return mInner->recycler();
+    }
+
+    void receiveError(const nsAString& aMsg, nsresult aRes) MOZ_OVERRIDE
+    {
+        NS_ASSERTION(mInner, "mInner is null!!!");
+#ifdef DEBUG
+        nsAutoString error(NS_LITERAL_STRING("forwarded error: "));
+        error.Append(aMsg);
+        mInner->receiveError(error, aRes);
+#else
+        mInner->receiveError(aMsg, aRes);
+#endif
+    }
+
+    const txXPathNode& getContextNode() MOZ_OVERRIDE
+    {
+        return mNode;
+    }
+
+    uint32_t size() MOZ_OVERRIDE
+    {
+        return 1;
+    }
+
+    uint32_t position() MOZ_OVERRIDE
+    {
+        return 1;
+    }
+
+private:
+    const txXPathNode& mNode;
+    txIMatchContext* mInner;
+};
+
+#endif // __TX_XPATH_SINGLENODE_CONTEXT