1 files changed, 69 insertions, 0 deletions
diff --git a/WebCore/platform/text/BidiContext.h b/WebCore/platform/text/BidiContext.h
new file mode 100644
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+++ b/WebCore/platform/text/BidiContext.h
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+/*
+ * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
+ * Copyright (C) 2003, 2004, 2006, 2007 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/RefPtr.h>
+#include <wtf/unicode/Unicode.h>
+
+namespace WebCore {
+
+// Used to keep track of explicit embeddings.
+class BidiContext {
+public:
+    BidiContext(unsigned char level, WTF::Unicode::Direction direction, bool override = false, BidiContext* parent = 0)
+        : m_level(level)
+        , m_direction(direction)
+        , m_override(override)
+        , m_parent(parent)
+        , m_refCount(0)
+    {
+        ASSERT(direction == WTF::Unicode::LeftToRight || direction == WTF::Unicode::RightToLeft);
+    }
+
+    void ref() const { m_refCount++; }
+    void deref() const
+    {
+        m_refCount--;
+        if (m_refCount <= 0)
+            delete this;
+    }
+
+    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; }
+
+private:
+    unsigned char m_level;
+    unsigned m_direction : 5; // Direction
+    bool m_override : 1;
+    RefPtr<BidiContext> m_parent;
+    mutable int m_refCount;
+};
+
+bool operator==(const BidiContext&, const BidiContext&);
+
+} // namespace WebCore
+
+#endif // BidiContext_h