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// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_MATHML_MATHML_OPERATOR_ELEMENT_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_MATHML_MATHML_OPERATOR_ELEMENT_H_
#include "third_party/blink/renderer/core/mathml/mathml_element.h"
#include "third_party/blink/renderer/platform/wtf/text/character_names.h"
namespace blink {
class ComputedStyle;
class CSSToLengthConversionData;
class Document;
enum class MathMLOperatorDictionaryCategory : uint8_t;
// Math units are 1/18em.
constexpr double kMathUnitFraction = 1.0 / 18.0;
class CORE_EXPORT MathMLOperatorElement final : public MathMLElement {
public:
explicit MathMLOperatorElement(Document&);
struct OperatorContent {
String characters;
UChar32 code_point = kNonCharacter;
bool is_vertical = true;
};
enum OperatorPropertyFlag {
kStretchy = 0x1,
kSymmetric = 0x2,
kLargeOp = 0x4,
kMovableLimits = 0x8,
};
// Query whether given flag is set in the operator dictionary.
bool HasBooleanProperty(OperatorPropertyFlag);
void AddMathLSpaceIfNeeded(ComputedStyle&, const CSSToLengthConversionData&);
void AddMathRSpaceIfNeeded(ComputedStyle&, const CSSToLengthConversionData&);
void AddMathMinSizeIfNeeded(ComputedStyle&, const CSSToLengthConversionData&);
void AddMathMaxSizeIfNeeded(ComputedStyle&, const CSSToLengthConversionData&);
const OperatorContent& GetOperatorContent();
double DefaultLeadingSpace();
double DefaultTrailingSpace();
void CheckFormAfterSiblingChange();
private:
absl::optional<OperatorContent> operator_content_;
// Operator properties calculated from dictionary and attributes.
// It contains dirty flags to allow efficient dictionary updating.
struct Properties {
MathMLOperatorDictionaryCategory dictionary_category;
unsigned flags : 4;
unsigned dirty_flags : 4;
};
Properties properties_;
void ComputeDictionaryCategory();
void ComputeOperatorProperty(OperatorPropertyFlag);
void SetOperatorFormDirty();
void ParseAttribute(const AttributeModificationParams&) final;
void SetOperatorPropertyDirtyFlagIfNeeded(const AttributeModificationParams&,
const OperatorPropertyFlag&,
bool& needs_layout);
OperatorContent ParseOperatorContent();
void ChildrenChanged(const ChildrenChange&) final;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_MATHML_MATHML_OPERATOR_ELEMENT_H_
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