1/*
2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 * Copyright (C) 2000 Frederik Holljen (frederik.holljen@hig.no)
4 * Copyright (C) 2001 Peter Kelly (pmk@post.com)
5 * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
6 * Copyright (C) 2004, 2008 Apple Inc. All rights reserved.
7 *
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
17 *
18 * You should have received a copy of the GNU Library General Public License
19 * along with this library; see the file COPYING.LIB. If not, write to
20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
22 *
23 */
24
25#include "config.h"
26#include "Traversal.h"
27
28#include "CallbackResult.h"
29#include "Node.h"
30#include "NodeFilter.h"
31#include <wtf/SetForScope.h>
32
33namespace WebCore {
34
35NodeIteratorBase::NodeIteratorBase(Node& rootNode, unsigned whatToShow, RefPtr<NodeFilter>&& nodeFilter)
36 : m_root(rootNode)
37 , m_filter(WTFMove(nodeFilter))
38 , m_whatToShow(whatToShow)
39{
40}
41
42// https://dom.spec.whatwg.org/#concept-node-filter
43ExceptionOr<unsigned short> NodeIteratorBase::acceptNode(Node& node)
44{
45 if (m_isActive)
46 return Exception { InvalidStateError, "Recursive filters are not allowed"_s };
47
48 // The bit twiddling here is done to map DOM node types, which are given as integers from
49 // 1 through 14, to whatToShow bit masks.
50 if (!(((1 << (node.nodeType() - 1)) & m_whatToShow)))
51 return NodeFilter::FILTER_SKIP;
52
53 if (!m_filter)
54 return NodeFilter::FILTER_ACCEPT;
55
56 SetForScope<bool> isActive(m_isActive, true);
57 auto callbackResult = m_filter->acceptNode(node);
58 if (callbackResult.type() == CallbackResultType::ExceptionThrown)
59 return Exception { ExistingExceptionError };
60 return callbackResult.releaseReturnValue();
61}
62
63} // namespace WebCore
64