// Copyright 2015 The Chromium Authors. All rights reserved.
// Copyright (C) 2016-2020 Apple Inc. All rights reserved.
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#pragma once

#include "CSSValue.h"

namespace WebCore {

class CSSParserTokenRange;
class CSSVariableData;

namespace Style {
class BuilderState;
}

class CSSVariableReferenceValue : public CSSValue {
public:
    static Ref<CSSVariableReferenceValue> create(const CSSParserTokenRange&);

    bool equals(const CSSVariableReferenceValue&) const;
    String customCSSText() const;

    RefPtr<CSSVariableData> resolveVariableReferences(Style::BuilderState&) const;

    // The maximum number of tokens that may be produced by a var()
    // reference or var() fallback value.
    // https://drafts.csswg.org/css-variables/#long-variables
    static constexpr size_t maxSubstitutionTokens = 65536;

private:
    explicit CSSVariableReferenceValue(Ref<CSSVariableData>&&);

    Ref<CSSVariableData> m_data;
    mutable String m_stringValue;
};

} // namespace WebCore

SPECIALIZE_TYPE_TRAITS_CSS_VALUE(CSSVariableReferenceValue, isVariableReferenceValue())