Add template parameter to ElementTraversal to iterate over Elements of a specific type

Source/core/dom/Traversal.cpp

-/*
- * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
- * Copyright (C) 2000 Frederik Holljen (frederik.holljen@hig.no)
- * Copyright (C) 2001 Peter Kelly (pmk@post.com)
- * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
- * Copyright (C) 2004, 2008 Apple Inc. All rights reserved.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public License
- * along with this library; see the file COPYING.LIB.  If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- *
- */
-
-#include "config.h"
-#include "core/dom/Traversal.h"
-
-#include "core/dom/Node.h"
-#include "core/dom/NodeFilter.h"
-
-namespace WebCore {
-
-Traversal::Traversal(PassRefPtr<Node> rootNode, unsigned whatToShow, PassRefPtr<NodeFilter> nodeFilter)
-    : m_root(rootNode)
-    , m_whatToShow(whatToShow)
-    , m_filter(nodeFilter)
-{
-}
-
-short Traversal::acceptNode(ScriptState* state, Node* node) const
-{
-    // The bit twiddling here is done to map DOM node types, which are given as integers from
-    // 1 through 14, to whatToShow bit masks.
-    if (!(((1 << (node->nodeType() - 1)) & m_whatToShow)))
-        return NodeFilter::FILTER_SKIP;
-    if (!m_filter)
-        return NodeFilter::FILTER_ACCEPT;
-    return m_filter->acceptNode(state, node);
-}
-
-} // namespace WebCore