Move text/BidiContext to Source/platform/

Source/core/platform/text/BidiContext.h

-/*
- * 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 m_level : 6; // The maximium bidi level is 62: http://unicode.org/reports/tr9/#Explicit_Levels_and_Directions
-    unsigned m_direction : 5; // Direction
-    unsigned 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