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/*
* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
* Copyright (C) 2003, 2004, 2006, 2007, 2009, 2010 Apple Inc. All right 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.
*
*/
#ifndef BidiContext_h
#define BidiContext_h
#include <wtf/Assertions.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.h>
#include <wtf/unicode/Unicode.h>
namespace WebCore {
enum BidiEmbeddingSource {
FromStyleOrDOM,
FromUnicode
};
// Used to keep track of explicit embeddings.
class BidiContext : public RefCounted<BidiContext> {
public:
static PassRefPtr<BidiContext> create(unsigned char level, WTF::Unicode::Direction, bool override = false, BidiEmbeddingSource = FromStyleOrDOM, BidiContext* parent = 0);
BidiContext* parent() const { return m_parent.get(); }
unsigned char level() const { return m_level; }
WTF::Unicode::Direction dir() const { return static_cast<WTF::Unicode::Direction>(m_direction); }
bool override() const { return m_override; }
BidiEmbeddingSource source() const { return static_cast<BidiEmbeddingSource>(m_source); }
PassRefPtr<BidiContext> copyStackRemovingUnicodeEmbeddingContexts();
private:
BidiContext(unsigned char level, WTF::Unicode::Direction direction, bool override, BidiEmbeddingSource source, BidiContext* parent)
: m_level(level)
, m_direction(direction)
, m_override(override)
, m_source(source)
, m_parent(parent)
{
}
static PassRefPtr<BidiContext> createUncached(unsigned char level, WTF::Unicode::Direction, bool override, BidiEmbeddingSource, BidiContext* parent);
unsigned char m_level;
unsigned m_direction : 5; // Direction
bool m_override : 1;
unsigned m_source : 1; // BidiEmbeddingSource
RefPtr<BidiContext> m_parent;
};
inline unsigned char nextGreaterOddLevel(unsigned char level)
{
return (level + 1) | 1;
}
inline unsigned char nextGreaterEvenLevel(unsigned char level)
{
return (level + 2) & ~1;
}
bool operator==(const BidiContext&, const BidiContext&);
} // namespace WebCore
#endif // BidiContext_h
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