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