diff -r 000000000000 -r 6474c204b198 content/xul/templates/src/nsContentTestNode.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/xul/templates/src/nsContentTestNode.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,91 @@
+/* -*- 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 "nsContentTestNode.h"
+#include "nsIRDFResource.h"
+#include "nsIAtom.h"
+#include "nsIDOMElement.h"
+#include "nsXULContentUtils.h"
+#include "nsIXULTemplateResult.h"
+#include "nsIXULTemplateBuilder.h"
+#include "nsXULTemplateQueryProcessorRDF.h"
+
+#include "prlog.h"
+#ifdef PR_LOGGING
+extern PRLogModuleInfo* gXULTemplateLog;
+#endif
+
+nsContentTestNode::nsContentTestNode(nsXULTemplateQueryProcessorRDF* aProcessor,
+                                     nsIAtom* aRefVariable)
+    : TestNode(nullptr),
+      mProcessor(aProcessor),
+      mDocument(nullptr),
+      mRefVariable(aRefVariable),
+      mTag(nullptr)
+{
+#ifdef PR_LOGGING
+    if (PR_LOG_TEST(gXULTemplateLog, PR_LOG_DEBUG)) {
+        nsAutoString tag(NS_LITERAL_STRING("(none)"));
+        if (mTag)
+            mTag->ToString(tag);
+
+        nsAutoString refvar(NS_LITERAL_STRING("(none)"));
+        if (aRefVariable)
+            aRefVariable->ToString(refvar);
+
+        PR_LOG(gXULTemplateLog, PR_LOG_DEBUG,
+               ("nsContentTestNode[%p]: ref-var=%s tag=%s",
+                this, NS_ConvertUTF16toUTF8(refvar).get(),
+                NS_ConvertUTF16toUTF8(tag).get()));
+    }
+#endif
+}
+
+nsresult
+nsContentTestNode::FilterInstantiations(InstantiationSet& aInstantiations,
+                                        bool* aCantHandleYet) const
+
+{
+    if (aCantHandleYet)
+        *aCantHandleYet = false;
+    return NS_OK;
+}
+
+nsresult
+nsContentTestNode::Constrain(InstantiationSet& aInstantiations)
+{
+    // contrain the matches to those that have matched in the template builder
+
+    nsIXULTemplateBuilder* builder = mProcessor->GetBuilder();
+    if (!builder) {
+        aInstantiations.Clear();
+        return NS_OK;
+    }
+
+    nsresult rv;
+
+    InstantiationSet::Iterator last = aInstantiations.Last();
+    for (InstantiationSet::Iterator inst = aInstantiations.First(); inst != last; ++inst) {
+
+        nsCOMPtr<nsIRDFNode> refValue;
+        bool hasRefBinding = inst->mAssignments.GetAssignmentFor(mRefVariable,
+                                                                   getter_AddRefs(refValue));
+        if (hasRefBinding) {
+            nsCOMPtr<nsIRDFResource> refResource = do_QueryInterface(refValue);
+            if (refResource) {
+                bool generated;
+                rv = builder->HasGeneratedContent(refResource, mTag, &generated);
+                if (NS_FAILED(rv)) return rv;
+
+                if (generated)
+                    continue;
+            }
+        }
+
+        aInstantiations.Erase(inst--);
+    }
+
+    return NS_OK;
+}