Source/WebCore/style/ContainerQueryEvaluator.h

   1 /*
   2  * Copyright (C) 2022 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1.  Redistributions of source code must retain the above copyright
   8  *     notice, this list of conditions and the following disclaimer.
   9  * 2.  Redistributions in binary form must reproduce the above copyright
  10  *     notice, this list of conditions and the following disclaimer in the
  11  *     documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  16  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  17  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  19  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  20  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  22  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  23  */
  24
  25 #pragma once
  26
  27 #include "ContainerQuery.h"
  28 #include "SelectorMatchingState.h"
  29 #include <wtf/Ref.h>
  30
  31 namespace WebCore {
  32
  33 class Element;
  34
  35 namespace Style {
  36
  37 enum class EvaluationResult : uint8_t { False, True, Unknown };
  38
  39 class ContainerQueryEvaluator {
  40 public:
  41     ContainerQueryEvaluator(const Element&, PseudoId, SelectorMatchingState*);
  42
  43     bool evaluate(const FilteredContainerQuery&) const;
  44
  45     static const Element* selectContainer(OptionSet<CQ::Axis>, const String& name, const Element&, const CachedQueryContainers*, PseudoId = PseudoId::None);
  46
  47 private:
  48     struct SelectedContainer;
  49     std::optional<SelectedContainer> selectContainer(const FilteredContainerQuery&) const;
  50
  51     EvaluationResult evaluateQuery(const CQ::ContainerQuery&, const SelectedContainer&) const;
  52     EvaluationResult evaluateQuery(const CQ::SizeQuery&, const SelectedContainer&) const;
  53     template<typename ConditionType> EvaluationResult evaluateCondition(const ConditionType&, const SelectedContainer&) const;
  54     EvaluationResult evaluateSizeFeature(const CQ::SizeFeature&, const SelectedContainer&) const;
  55
  56     const Ref<const Element> m_element;
  57     const PseudoId m_pseudoId;
  58     SelectorMatchingState* m_selectorMatchingState;
  59 };
  60
  61 inline EvaluationResult toEvaluationResult(bool boolean)
  62 {
  63     return boolean ? EvaluationResult::True : EvaluationResult::False;
  64 };
  65
  66 inline EvaluationResult operator&(EvaluationResult left, EvaluationResult right)
  67 {
  68     if (left == EvaluationResult::Unknown || right == EvaluationResult::Unknown)
  69         return EvaluationResult::Unknown;
  70     if (left == EvaluationResult::True && right == EvaluationResult::True)
  71         return EvaluationResult::True;
  72     return EvaluationResult::False;
  73 }
  74
  75 inline EvaluationResult operator!(EvaluationResult result)
  76 {
  77     switch (result) {
  78     case EvaluationResult::True:
  79         return EvaluationResult::False;
  80     case EvaluationResult::False:
  81         return EvaluationResult::True;
  82     case EvaluationResult::Unknown:
  83         return EvaluationResult::Unknown;
  84     }
  85     RELEASE_ASSERT_NOT_REACHED();
  86 }
  87
  88 }
  89 }