70 lines
2.6 KiB
C++
70 lines
2.6 KiB
C++
/*
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* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
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* Copyright (C) 2003-2017 Apple Inc. All right 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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#pragma once
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#include <unicode/uchar.h>
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#include <wtf/RefPtr.h>
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#include <wtf/ThreadSafeRefCounted.h>
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namespace WebCore {
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enum BidiEmbeddingSource { FromStyleOrDOM, FromUnicode };
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// Used to keep track of explicit embeddings.
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class BidiContext : public ThreadSafeRefCounted<BidiContext> {
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public:
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WEBCORE_EXPORT static Ref<BidiContext> create(unsigned char level, UCharDirection, bool override = false, BidiEmbeddingSource = FromStyleOrDOM, BidiContext* parent = nullptr);
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BidiContext* parent() const { return m_parent.get(); }
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unsigned char level() const { return m_level; }
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UCharDirection dir() const { return static_cast<UCharDirection>(m_direction); }
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bool override() const { return m_override; }
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BidiEmbeddingSource source() const { return static_cast<BidiEmbeddingSource>(m_source); }
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WEBCORE_EXPORT Ref<BidiContext> copyStackRemovingUnicodeEmbeddingContexts();
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private:
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BidiContext(unsigned char level, UCharDirection, bool override, BidiEmbeddingSource, BidiContext* parent);
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static Ref<BidiContext> createUncached(unsigned char level, UCharDirection, bool override, BidiEmbeddingSource, BidiContext* parent);
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unsigned m_level : 6; // The maximium bidi level is 62: http://unicode.org/reports/tr9/#Explicit_Levels_and_Directions
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unsigned m_direction : 5; // Direction
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unsigned m_override : 1;
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unsigned m_source : 1; // BidiEmbeddingSource
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RefPtr<BidiContext> m_parent;
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};
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inline unsigned char nextGreaterOddLevel(unsigned char level)
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{
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return (level + 1) | 1;
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}
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inline unsigned char nextGreaterEvenLevel(unsigned char level)
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{
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return (level + 2) & ~1;
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}
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bool operator==(const BidiContext&, const BidiContext&);
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} // namespace WebCore
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