[dom] support iterable<> NodeList

third_party/WebKit/Source/core/dom/NodeList.cpp

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "core/dom/NodeList.h"
+
+namespace blink {
+
+namespace {
+
+    class NodeListIterationSource final : public ValueIterable<Node*>::IterationSource {
+    public:
+        explicit NodeListIterationSource(NodeList& nodeList)
+            : m_nodeList(nodeList)
+        {
+        }
+
+        bool next(ScriptState* scriptState, Node*& value, ExceptionState& exceptionState) override
+        {
+            value = m_nodeList->item(m_index);
+            return !!value;
+        }
+
+        DEFINE_INLINE_VIRTUAL_TRACE()
+        {
+            visitor->trace(m_nodeList);
+            ValueIterable<Node*>::IterationSource::trace(visitor);
+        }
+
+    private:
+        const RefPtrWillBeMember<NodeList> m_nodeList;
+    };
+
+} // namespace
+
+ValueIterable<Node*>::IterationSource* NodeList::startIteration(ScriptState*, ExceptionState&)
+{
+    return new NodeListIterationSource(*this);
+}
+
+} // namespace blink