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 | |
33 | namespace WebCore { |
34 | |
35 | NodeIteratorBase::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 |
43 | ExceptionOr<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 | |