Source/WebCore/style/ContainerQueryEvaluator.h

/*
 * Copyright (C) 2022 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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 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
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 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
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#pragma once

#include "ContainerQuery.h"
#include "SelectorMatchingState.h"
#include "StyleScopeOrdinal.h"
#include <wtf/Ref.h>

namespace WebCore {

class Element;

namespace Style {

enum class EvaluationResult : uint8_t { False, True, Unknown };

class ContainerQueryEvaluator {
public:
    enum class SelectionMode : bool { Element, PseudoElement };
    ContainerQueryEvaluator(const Element&, SelectionMode, ScopeOrdinal, SelectorMatchingState*);

    bool evaluate(const FilteredContainerQuery&) const;

    static const Element* selectContainer(OptionSet<CQ::Axis>, const String& name, const Element&, SelectionMode = SelectionMode::Element, ScopeOrdinal = ScopeOrdinal::Element, const CachedQueryContainers* = nullptr);

private:
    struct SelectedContainer;
    std::optional<SelectedContainer> selectContainer(const FilteredContainerQuery&) const;

    EvaluationResult evaluateQuery(const CQ::ContainerQuery&, const SelectedContainer&) const;
    template<typename ConditionType> EvaluationResult evaluateCondition(const ConditionType&, const SelectedContainer&) const;
    EvaluationResult evaluateSizeFeature(const CQ::SizeFeature&, const SelectedContainer&) const;

    const Ref<const Element> m_element;
    const SelectionMode m_selectionMode;
    const ScopeOrdinal m_scopeOrdinal;
    SelectorMatchingState* m_selectorMatchingState;
};

inline EvaluationResult toEvaluationResult(bool boolean)
{
    return boolean ? EvaluationResult::True : EvaluationResult::False;
};

inline EvaluationResult operator&(EvaluationResult left, EvaluationResult right)
{
    if (left == EvaluationResult::Unknown || right == EvaluationResult::Unknown)
        return EvaluationResult::Unknown;
    if (left == EvaluationResult::True && right == EvaluationResult::True)
        return EvaluationResult::True;
    return EvaluationResult::False;
}

inline EvaluationResult operator!(EvaluationResult result)
{
    switch (result) {
    case EvaluationResult::True:
        return EvaluationResult::False;
    case EvaluationResult::False:
        return EvaluationResult::True;
    case EvaluationResult::Unknown:
        return EvaluationResult::Unknown;
    }
    RELEASE_ASSERT_NOT_REACHED();
}

}
}