/*
 * (C) 1999-2003 Lars Knoll (knoll@kde.org)
 * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
 *
 * 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 CSSProperty_h
#define CSSProperty_h

#include "CSSPropertyNames.h"
#include "CSSValue.h"
#include "RenderStyleConstants.h"
#include "TextDirection.h"
#include "WritingMode.h"
#include <wtf/PassRefPtr.h>
#include <wtf/RefPtr.h>

namespace WebCore {

union StylePropertyMetadata {
    StylePropertyMetadata(CSSPropertyID propertyID, CSSPropertyID shorthandID, bool important, bool implicit, bool inherited)
        : m_propertyID(propertyID)
        , m_shorthandID(shorthandID)
        , m_important(important)
        , m_implicit(implicit)
        , m_inherited(inherited)
    {
    }

    unsigned m_bits;
    struct {
        unsigned m_propertyID : 14;
        unsigned m_shorthandID : 14; // If this property was set as part of a shorthand, gives the shorthand.
        unsigned m_important : 1;
        unsigned m_implicit : 1; // Whether or not the property was set implicitly as the result of a shorthand.
        unsigned m_inherited : 1;
    };
};

class CSSProperty {
public:
    CSSProperty(CSSPropertyID propertyID, PassRefPtr<CSSValue> value, bool important = false, CSSPropertyID shorthandID = CSSPropertyInvalid, bool implicit = false)
        : m_metadata(propertyID, shorthandID, important, implicit, isInheritedProperty(propertyID))
        , m_value(value)
    {
#if ENABLE(CSS_VARIABLES)
    ASSERT((propertyID == CSSPropertyVariable) == (m_value && m_value->isVariableValue()));
#endif
    }

    // FIXME: Remove this.
    CSSProperty(StylePropertyMetadata metadata, CSSValue* value)
        : m_metadata(metadata)
        , m_value(value)
    {
#if ENABLE(CSS_VARIABLES)
    ASSERT((metadata.m_propertyID == CSSPropertyVariable) == (m_value && m_value->isVariableValue()));
#endif
    }

    CSSPropertyID id() const { return static_cast<CSSPropertyID>(m_metadata.m_propertyID); }
    CSSPropertyID shorthandID() const { return static_cast<CSSPropertyID>(m_metadata.m_shorthandID); }
    bool isImportant() const { return m_metadata.m_important; }

    CSSValue* value() const { return m_value.get(); }

    void wrapValueInCommaSeparatedList();

    static CSSPropertyID resolveDirectionAwareProperty(CSSPropertyID, TextDirection, WritingMode);
    static bool isInheritedProperty(CSSPropertyID);

    void reportMemoryUsage(MemoryObjectInfo*) const;

    StylePropertyMetadata metadata() const { return m_metadata; }

private:
    StylePropertyMetadata m_metadata;
    RefPtr<CSSValue> m_value;
};

} // namespace WebCore

namespace WTF {
template <> struct VectorTraits<WebCore::CSSProperty> : VectorTraitsBase<false, WebCore::CSSProperty> {
    static const bool canInitializeWithMemset = true;
    static const bool canMoveWithMemcpy = true;
};
}

#endif // CSSProperty_h
