Source/WebCore/css/CSSVariableDependentValue.h

/*
 * Copyright (C) 2015 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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#ifndef CSSVariableDependentValue_h
#define CSSVariableDependentValue_h

#include "CSSParserValues.h"
#include "CSSPropertyNames.h"
#include "CSSValueList.h"
#include <wtf/RefPtr.h>

namespace WebCore {

class CSSVariableDependentValue : public CSSValue {
public:
    static Ref<CSSVariableDependentValue> create(RefPtr<CSSValueList>& valueList, CSSPropertyID propId)
    {
        return adoptRef(*new CSSVariableDependentValue(valueList, propId));
    }
    
    String customCSSText() const
    {
        if (!m_serialized) {
            m_serialized = true;
            m_stringValue = m_valueList ? m_valueList->customCSSText() : emptyString();
        }
        return m_stringValue;
    }
    
    // FIXME: Should arguably implement equals on all of the CSSParserValues, but CSSValue equivalence
    // is rarely used, so serialization to compare is probably fine.
    bool equals(const CSSVariableDependentValue& other) const { return customCSSText() == other.customCSSText(); }
    
    CSSPropertyID propertyID() const { return m_propertyID; }
    
    CSSValueList* valueList() const { return m_valueList.get(); }

    bool checkVariablesForCycles(const AtomicString& name, CustomPropertyValueMap& customProperties, const HashSet<AtomicString>& seenProperties, HashSet<AtomicString>& invalidProperties);

private:
    CSSVariableDependentValue(RefPtr<CSSValueList>& valueList, CSSPropertyID propId)
        : CSSValue(VariableDependentClass)
        , m_valueList(valueList)
        , m_propertyID(propId)
    {
    }

    RefPtr<CSSValueList> m_valueList;
    CSSPropertyID m_propertyID;
    mutable String m_stringValue;
    mutable bool m_serialized { false };
};

} // namespace WebCore

SPECIALIZE_TYPE_TRAITS_CSS_VALUE(CSSVariableDependentValue, isVariableDependentValue())

#endif // CSSCustomPropertyValue_h