Source/WebCore/style/ScopedName.h

/*
 * Copyright (C) 2023 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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#pragma once

#include <WebCore/StyleScopeOrdinal.h>
#include <WebCore/StyleValueTypes.h>
#include <wtf/text/AtomString.h>

namespace WebCore {
namespace Style {

struct ScopedName {
    AtomString name;
    ScopeOrdinal scopeOrdinal { ScopeOrdinal::Element };
    bool isIdentifier { true };

    template<typename... F> decltype(auto) switchOn(F&&... f) const
    {
        auto visitor = WTF::makeVisitor(std::forward<F>(f)...);
        if (isIdentifier)
            return visitor(CustomIdentifier { name });
        return visitor(name);
    }

    bool operator==(const ScopedName&) const = default;
};

// MARK: - Conversion

template<> struct CSSValueConversion<ScopedName> {
    ScopedName operator()(BuilderState&, const CSSPrimitiveValue&);
    ScopedName operator()(BuilderState&, const CSSValue&);
};

// MARK: - Logging

WTF::TextStream& operator<<(WTF::TextStream&, const ScopedName&);

} // namespace Style
} // namespace WebCore

namespace WTF {

template<>
struct MarkableTraits<WebCore::Style::ScopedName> {
    static bool isEmptyValue(const WebCore::Style::ScopedName& value) { return value.name.isNull(); }
    static WebCore::Style::ScopedName emptyValue() { return WebCore::Style::ScopedName { nullAtom() }; }
};

} // namespace WTF

DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::ScopedName)