Source/WebCore/rendering/RenderText.h - external/github.com/WebKit/webkit - Git at Google

 /*
  * (C) 1999 Lars Knoll ([email protected])
  * (C) 2000 Dirk Mueller ([email protected])
  * Copyright (C) 2004-2023 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */

 #pragma once

 #include "Color.h"
 #include "FontCascade.h"
 #include "RenderElement.h"
 #include "RenderTextLineBoxes.h"
 #include "Text.h"
 #include <wtf/Forward.h>
 #include <wtf/Markable.h>
 #include <wtf/text/TextBreakIterator.h>

 namespace WebCore {

 class Font;
 struct GlyphOverflow;
 struct WordTrailingSpace;
 enum class DocumentMarkerType : uint32_t;

 namespace Layout {
 class InlineTextBox;
 }

 namespace LayoutIntegration {
 class LineLayout;
 }

 class RenderText : public RenderObject {
     WTF_MAKE_TZONE_OR_ISO_ALLOCATED(RenderText);
     WTF_OVERRIDE_DELETE_FOR_CHECKED_PTR(RenderText);
 public:
     RenderText(Type, Text&, const String&);
     RenderText(Type, Document&, const String&);

     virtual ~RenderText();

     Layout::InlineTextBox* layoutBox();
     const Layout::InlineTextBox* layoutBox() const;

     WEBCORE_EXPORT Text* textNode() const;
     RefPtr<Text> protectedTextNode() const { return textNode(); }

     const RenderStyle& style() const;
     // FIXME: Remove checkedStyle once https://github.com/llvm/llvm-project/pull/142485 lands. This is a false positive.
     const CheckedRef<const RenderStyle> checkedStyle() const { return style(); }
     const RenderStyle& firstLineStyle() const;
     const RenderStyle* getCachedPseudoStyle(const Style::PseudoElementIdentifier&, const RenderStyle* parentStyle = nullptr) const;

     Color selectionBackgroundColor() const;
     Color selectionForegroundColor() const;
     Color selectionEmphasisMarkColor() const;
     std::unique_ptr<RenderStyle> selectionPseudoStyle() const;

     const RenderStyle* spellingErrorPseudoStyle() const;
     const RenderStyle* grammarErrorPseudoStyle() const;
     const RenderStyle* targetTextPseudoStyle() const;

     virtual String originalText() const;


     const String& text() const { return m_text; }
     String textWithoutConvertingBackslashToYenSymbol() const;

     void boundingRects(Vector<LayoutRect>&, const LayoutPoint& accumulatedOffset) const final;
     Vector<IntRect> absoluteRectsForRange(unsigned startOffset = 0, unsigned endOffset = UINT_MAX, bool useSelectionHeight = false, bool* wasFixed = nullptr) const;
 #if PLATFORM(IOS_FAMILY)
     void collectSelectionGeometries(Vector<SelectionGeometry>&, unsigned startOffset = 0, unsigned endOffset = std::numeric_limits<unsigned>::max()) final;
 #endif

     void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const final;
     Vector<FloatQuad> absoluteQuadsForRange(unsigned startOffset = 0, unsigned endOffset = UINT_MAX, OptionSet<RenderObject::BoundingRectBehavior> = { }, bool* wasFixed = nullptr) const;

     Vector<FloatQuad> absoluteQuadsClippedToEllipsis() const;

     Position positionForPoint(const LayoutPoint&, HitTestSource) final;

     bool hasEmptyText() const { return m_text.isEmpty(); }

     char16_t characterAt(unsigned) const;
     size_t length() const { return text().length(); }

     float width(unsigned from, unsigned length, const FontCascade&, float xPos, SingleThreadWeakHashSet<const Font>* fallbackFonts = nullptr, GlyphOverflow* = nullptr) const;
     float width(unsigned from, unsigned length, float xPos, bool firstLine = false, SingleThreadWeakHashSet<const Font>* fallbackFonts = nullptr, GlyphOverflow* = nullptr) const;

     float minLogicalWidth() const;
     float maxLogicalWidth() const;

     struct Widths {
         float min { 0 };
         float max { 0 };
         float beginMin { 0 };
         float endMin { 0 };
         float beginMax { 0 };
         float endMax { 0 };
         bool beginWS { false };
         bool endWS { false };
         bool endZeroSpace { false };
         bool hasBreakableChar { false };
         bool hasBreak { false };
         bool endsWithBreak { false };
     };
     Widths trimmedPreferredWidths(float leadWidth, bool& stripFrontSpaces);

     float hangablePunctuationStartWidth(unsigned index) const;
     float hangablePunctuationEndWidth(unsigned index) const;
     unsigned firstCharacterIndexStrippingSpaces() const;
     unsigned lastCharacterIndexStrippingSpaces() const;
     static bool isHangableStopOrComma(char16_t);

     WEBCORE_EXPORT virtual IntRect linesBoundingBox() const;
     WEBCORE_EXPORT IntPoint firstRunLocation() const;

     void setText(const String&, bool force = false);
     void setTextWithOffset(const String&, unsigned offset);

     bool canBeSelectionLeaf() const override { return true; }

     LayoutRect collectSelectionGeometriesForLineBoxes(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent, Vector<FloatQuad>&);

     inline LayoutUnit marginLeft() const;
     inline LayoutUnit marginRight() const;

     int caretMinOffset() const final;
     int caretMaxOffset() const final;
     unsigned countRenderedCharacterOffsetsUntil(unsigned) const;
     bool containsRenderedCharacterOffset(unsigned) const;
     bool containsCaretOffset(unsigned) const;
     bool hasRenderedText() const;

     // FIXME: These should return unsigneds.
     int previousOffset(int current) const final;
     int previousOffsetForBackwardDeletion(int current) const final;
     int nextOffset(int current) const final;

     bool needsVisualReordering() const { return m_needsVisualReordering; }
     void setNeedsVisualReordering() { m_needsVisualReordering = true; }

     void momentarilyRevealLastTypedCharacter(unsigned offsetAfterLastTypedCharacter);

     bool containsOnlyCollapsibleWhitespace() const;

     FontCascade::CodePath fontCodePath() const { return static_cast<FontCascade::CodePath>(m_fontCodePath); }
     bool canUseSimpleFontCodePath() const { return fontCodePath() == FontCascade::CodePath::Simple; }
     bool shouldUseSimpleGlyphOverflowCodePath() const { return fontCodePath() == FontCascade::CodePath::SimpleWithGlyphOverflow; }

     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);

 #if ENABLE(TEXT_AUTOSIZING)
     float candidateComputedTextSize() const { return m_candidateComputedTextSize; }
     void setCandidateComputedTextSize(float size) { m_candidateComputedTextSize = size; }
 #endif

     StringView stringView(unsigned start = 0, std::optional<unsigned> stop = std::nullopt) const;

     bool containsOnlyCSSWhitespace(unsigned from, unsigned length) const;

     Vector<std::pair<unsigned, unsigned>> contentRangesBetweenOffsetsForType(const DocumentMarkerType, unsigned startOffset, unsigned endOffset) const;

     RenderInline* inlineWrapperForDisplayContents();
     void setInlineWrapperForDisplayContents(RenderInline*);

     template <typename MeasureTextCallback>
     static float measureTextConsideringPossibleTrailingSpace(bool currentCharacterIsSpace, unsigned startIndex, unsigned wordLength, WordTrailingSpace&, SingleThreadWeakHashSet<const Font>& fallbackFonts, MeasureTextCallback&&);

     static std::optional<bool> emphasisMarkExistsAndIsAbove(const RenderText&, const RenderStyle&);

     void resetMinMaxWidth();

     void setCanUseSimplifiedTextMeasuring(bool canUseSimplifiedTextMeasuring) { m_canUseSimplifiedTextMeasuring = canUseSimplifiedTextMeasuring; }
     std::optional<bool> canUseSimplifiedTextMeasuring() const { return m_canUseSimplifiedTextMeasuring; }
     void setHasPositionDependentContentWidth(bool hasPositionDependentContentWidth) { m_hasPositionDependentContentWidth = hasPositionDependentContentWidth; }
     std::optional<bool> hasPositionDependentContentWidth() const { return m_hasPositionDependentContentWidth; }
     void setHasStrongDirectionalityContent(bool hasStrongDirectionalityContent) { m_hasStrongDirectionalityContent = hasStrongDirectionalityContent; }
     std::optional<bool> hasStrongDirectionalityContent() const { return m_hasStrongDirectionalityContent; }

 protected:
     virtual void computePreferredLogicalWidths(float leadWidth, bool forcedMinMaxWidthComputation = false);
     void willBeDestroyed() override;

     virtual void setRenderedText(const String&);
     virtual Vector<char16_t> previousCharacter() const;

     virtual void setTextInternal(const String&, bool force);

 private:
     RenderText(Type, Node&, const String&);

     ASCIILiteral renderName() const override;

     bool canHaveChildren() const final { return false; }

     VisiblePosition positionForPoint(const LayoutPoint&, HitTestSource, const RenderFragmentContainer*) override;

     void setSelectionState(HighlightState) final;
     LayoutRect selectionRectForRepaint(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent = true) final;
     RepaintRects localRectsForRepaint(RepaintOutlineBounds) const final;

     void computePreferredLogicalWidths(float leadWidth, SingleThreadWeakHashSet<const Font>& fallbackFonts, GlyphOverflow&, bool forcedMinMaxWidthComputation = false);

     void computeFontCodePath();

     bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation&, const LayoutPoint&, HitTestAction) final { ASSERT_NOT_REACHED(); return false; }

     float widthFromCache(const FontCascade&, unsigned start, unsigned len, float xPos, SingleThreadWeakHashSet<const Font>* fallbackFonts, GlyphOverflow*, const RenderStyle&) const;
     bool computeUseBackslashAsYenSymbol() const;

     void secureText(char16_t mask);

     LayoutRect collectSelectionGeometriesForLineBoxes(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent, Vector<FloatQuad>*);

     void node() const = delete;
     void container() const = delete; // Use parent() instead.
     void container(const RenderLayerModelObject&, bool&) const = delete; // Use parent() instead.

     float maxWordFragmentWidth(const RenderStyle&, const FontCascade&, StringView word, unsigned minimumPrefixLength, unsigned minimumSuffixLength, bool currentCharacterIsSpace, unsigned characterIndex, float xPos, float entireWordWidth, WordTrailingSpace&, SingleThreadWeakHashSet<const Font>& fallbackFonts, GlyphOverflow&);
     float widthFromCacheConsideringPossibleTrailingSpace(const RenderStyle&, const FontCascade&, unsigned startIndex, unsigned wordLen, float xPos, bool currentCharacterIsSpace, WordTrailingSpace&, SingleThreadWeakHashSet<const Font>& fallbackFonts, GlyphOverflow&) const;
     void initiateFontLoadingByAccessingGlyphDataAndComputeCanUseSimplifiedTextMeasuring(const String&);

 #if ENABLE(TEXT_AUTOSIZING)
     // FIXME: This should probably be part of the text sizing structures in Document instead. That would save some memory.
     float m_candidateComputedTextSize { 0 };
 #endif
     Markable<float> m_minWidth;
     Markable<float> m_maxWidth;
     float m_beginMinWidth { 0 };
     float m_endMinWidth { 0 };

     String m_text;

 protected:
     std::optional<bool> m_canUseSimplifiedTextMeasuring;
 private:
     std::optional<bool> m_hasPositionDependentContentWidth;
     std::optional<bool> m_hasStrongDirectionalityContent;
     unsigned m_hasBreakableChar : 1 { false }; // Whether or not we can be broken into multiple lines.
     unsigned m_hasBreak : 1 { false }; // Whether or not we have a hard break (e.g., <pre> with '\n').
     unsigned m_hasTab : 1 { false }; // Whether or not we have a variable width tab character (e.g., <pre> with '\t').
     unsigned m_hasBeginWS : 1 { false }; // Whether or not we begin with WS (only true if we aren't pre)
     unsigned m_hasEndWS : 1 { false }; // Whether or not we end with WS (only true if we aren't pre)
     unsigned m_needsVisualReordering : 1 { false };
     unsigned m_containsOnlyASCII : 1 { false };
     mutable unsigned m_knownToHaveNoOverflowAndNoFallbackFonts : 1 { false };
     unsigned m_useBackslashAsYenSymbol : 1 { false };
     unsigned m_originalTextDiffersFromRendered : 1 { false };
     unsigned m_hasInlineWrapperForDisplayContents : 1 { false };
     unsigned m_hasSecureTextTimer : 1 { false };
     unsigned m_fontCodePath : 2 { 0 };
 };

 String applyTextTransform(const RenderStyle&, const String&, Vector<char16_t> previousCharacter);
 String applyTextTransform(const RenderStyle&, const String&);
 String capitalize(const String&, Vector<char16_t> previousCharacter);
 String capitalize(const String&);
 TextBreakIterator::LineMode::Behavior mapLineBreakToIteratorMode(LineBreak);
 TextBreakIterator::ContentAnalysis mapWordBreakToContentAnalysis(WordBreak);

 inline char16_t RenderText::characterAt(unsigned i) const
 {
     return i >= length() ? 0 : text()[i];
 }

 inline const RenderStyle& RenderText::style() const
 {
     return parent()->style();
 }

 inline const RenderStyle& RenderText::firstLineStyle() const
 {
     return parent()->firstLineStyle();
 }

 inline const RenderStyle* RenderText::getCachedPseudoStyle(const Style::PseudoElementIdentifier& pseudoElementIdentifier, const RenderStyle* parentStyle) const
 {
     // Pseudostyle is associated with an element, so ascend the tree until we find a non-anonymous ancestor.
     if (auto* ancestor = firstNonAnonymousAncestor())
         return ancestor->getCachedPseudoStyle(pseudoElementIdentifier, parentStyle);
     return nullptr;
 }

 inline Color RenderText::selectionBackgroundColor() const
 {
     if (auto* ancestor = firstNonAnonymousAncestor())
         return ancestor->selectionBackgroundColor();
     return Color();
 }

 inline Color RenderText::selectionForegroundColor() const
 {
     if (auto* ancestor = firstNonAnonymousAncestor())
         return ancestor->selectionForegroundColor();
     return Color();
 }

 inline Color RenderText::selectionEmphasisMarkColor() const
 {
     if (auto* ancestor = firstNonAnonymousAncestor())
         return ancestor->selectionEmphasisMarkColor();
     return Color();
 }

 inline std::unique_ptr<RenderStyle> RenderText::selectionPseudoStyle() const
 {
     if (auto* ancestor = firstNonAnonymousAncestor())
         return ancestor->selectionPseudoStyle();
     return nullptr;
 }

 inline const RenderStyle* RenderText::spellingErrorPseudoStyle() const
 {
     if (auto* ancestor = firstNonAnonymousAncestor())
         return ancestor->spellingErrorPseudoStyle();
     return nullptr;
 }

 inline const RenderStyle* RenderText::grammarErrorPseudoStyle() const
 {
     if (auto* ancestor = firstNonAnonymousAncestor())
         return ancestor->grammarErrorPseudoStyle();
     return nullptr;
 }

 inline const RenderStyle* RenderText::targetTextPseudoStyle() const
 {
     if (auto* ancestor = firstNonAnonymousAncestor())
         return ancestor->targetTextPseudoStyle();
     return nullptr;
 }

 inline RenderText* Text::renderer() const
 {
     return downcast<RenderText>(Node::renderer());
 }

 inline CheckedPtr<RenderText> Text::checkedRenderer() const
 {
     return renderer();
 }

 inline void RenderText::resetMinMaxWidth()
 {
     m_minWidth = { };
     m_maxWidth = { };
 }

 } // namespace WebCore

 SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderText, isRenderText())
	/*
	* (C) 1999 Lars Knoll ([email protected])
	* (C) 2000 Dirk Mueller ([email protected])
	* Copyright (C) 2004-2023 Apple Inc. All rights reserved.
	* Copyright (C) 2013 Google Inc. All rights reserved.
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Library General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Library General Public License for more details.
	*
	* You should have received a copy of the GNU Library General Public License
	* along with this library; see the file COPYING.LIB. If not, write to
	* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
	* Boston, MA 02110-1301, USA.
	*
	*/

	#pragma once

	#include "Color.h"
	#include "FontCascade.h"
	#include "RenderElement.h"
	#include "RenderTextLineBoxes.h"
	#include "Text.h"
	#include <wtf/Forward.h>
	#include <wtf/Markable.h>
	#include <wtf/text/TextBreakIterator.h>

	namespace WebCore {

	class Font;
	struct GlyphOverflow;
	struct WordTrailingSpace;
	enum class DocumentMarkerType : uint32_t;

	namespace Layout {
	class InlineTextBox;
	}

	namespace LayoutIntegration {
	class LineLayout;
	}

	class RenderText : public RenderObject {
	WTF_MAKE_TZONE_OR_ISO_ALLOCATED(RenderText);
	WTF_OVERRIDE_DELETE_FOR_CHECKED_PTR(RenderText);
	public:
	RenderText(Type, Text&, const String&);
	RenderText(Type, Document&, const String&);

	virtual ~RenderText();

	Layout::InlineTextBox* layoutBox();
	const Layout::InlineTextBox* layoutBox() const;

	WEBCORE_EXPORT Text* textNode() const;
	RefPtr<Text> protectedTextNode() const { return textNode(); }

	const RenderStyle& style() const;
	// FIXME: Remove checkedStyle once https://github.com/llvm/llvm-project/pull/142485 lands. This is a false positive.
	const CheckedRef<const RenderStyle> checkedStyle() const { return style(); }
	const RenderStyle& firstLineStyle() const;
	const RenderStyle* getCachedPseudoStyle(const Style::PseudoElementIdentifier&, const RenderStyle* parentStyle = nullptr) const;

	Color selectionBackgroundColor() const;
	Color selectionForegroundColor() const;
	Color selectionEmphasisMarkColor() const;
	std::unique_ptr<RenderStyle> selectionPseudoStyle() const;

	const RenderStyle* spellingErrorPseudoStyle() const;
	const RenderStyle* grammarErrorPseudoStyle() const;
	const RenderStyle* targetTextPseudoStyle() const;

	virtual String originalText() const;


	const String& text() const { return m_text; }
	String textWithoutConvertingBackslashToYenSymbol() const;

	void boundingRects(Vector<LayoutRect>&, const LayoutPoint& accumulatedOffset) const final;
	Vector<IntRect> absoluteRectsForRange(unsigned startOffset = 0, unsigned endOffset = UINT_MAX, bool useSelectionHeight = false, bool* wasFixed = nullptr) const;
	#if PLATFORM(IOS_FAMILY)
	void collectSelectionGeometries(Vector<SelectionGeometry>&, unsigned startOffset = 0, unsigned endOffset = std::numeric_limits<unsigned>::max()) final;
	#endif

	void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const final;
	Vector<FloatQuad> absoluteQuadsForRange(unsigned startOffset = 0, unsigned endOffset = UINT_MAX, OptionSet<RenderObject::BoundingRectBehavior> = { }, bool* wasFixed = nullptr) const;

	Vector<FloatQuad> absoluteQuadsClippedToEllipsis() const;

	Position positionForPoint(const LayoutPoint&, HitTestSource) final;

	bool hasEmptyText() const { return m_text.isEmpty(); }

	char16_t characterAt(unsigned) const;
	size_t length() const { return text().length(); }

	float width(unsigned from, unsigned length, const FontCascade&, float xPos, SingleThreadWeakHashSet<const Font>* fallbackFonts = nullptr, GlyphOverflow* = nullptr) const;
	float width(unsigned from, unsigned length, float xPos, bool firstLine = false, SingleThreadWeakHashSet<const Font>* fallbackFonts = nullptr, GlyphOverflow* = nullptr) const;

	float minLogicalWidth() const;
	float maxLogicalWidth() const;

	struct Widths {
	float min { 0 };
	float max { 0 };
	float beginMin { 0 };
	float endMin { 0 };
	float beginMax { 0 };
	float endMax { 0 };
	bool beginWS { false };
	bool endWS { false };
	bool endZeroSpace { false };
	bool hasBreakableChar { false };
	bool hasBreak { false };
	bool endsWithBreak { false };
	};
	Widths trimmedPreferredWidths(float leadWidth, bool& stripFrontSpaces);

	float hangablePunctuationStartWidth(unsigned index) const;
	float hangablePunctuationEndWidth(unsigned index) const;
	unsigned firstCharacterIndexStrippingSpaces() const;
	unsigned lastCharacterIndexStrippingSpaces() const;
	static bool isHangableStopOrComma(char16_t);

	WEBCORE_EXPORT virtual IntRect linesBoundingBox() const;
	WEBCORE_EXPORT IntPoint firstRunLocation() const;

	void setText(const String&, bool force = false);
	void setTextWithOffset(const String&, unsigned offset);

	bool canBeSelectionLeaf() const override { return true; }

	LayoutRect collectSelectionGeometriesForLineBoxes(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent, Vector<FloatQuad>&);

	inline LayoutUnit marginLeft() const;
	inline LayoutUnit marginRight() const;

	int caretMinOffset() const final;
	int caretMaxOffset() const final;
	unsigned countRenderedCharacterOffsetsUntil(unsigned) const;
	bool containsRenderedCharacterOffset(unsigned) const;
	bool containsCaretOffset(unsigned) const;
	bool hasRenderedText() const;

	// FIXME: These should return unsigneds.
	int previousOffset(int current) const final;
	int previousOffsetForBackwardDeletion(int current) const final;
	int nextOffset(int current) const final;

	bool needsVisualReordering() const { return m_needsVisualReordering; }
	void setNeedsVisualReordering() { m_needsVisualReordering = true; }

	void momentarilyRevealLastTypedCharacter(unsigned offsetAfterLastTypedCharacter);

	bool containsOnlyCollapsibleWhitespace() const;

	FontCascade::CodePath fontCodePath() const { return static_cast<FontCascade::CodePath>(m_fontCodePath); }
	bool canUseSimpleFontCodePath() const { return fontCodePath() == FontCascade::CodePath::Simple; }
	bool shouldUseSimpleGlyphOverflowCodePath() const { return fontCodePath() == FontCascade::CodePath::SimpleWithGlyphOverflow; }

	virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);

	#if ENABLE(TEXT_AUTOSIZING)
	float candidateComputedTextSize() const { return m_candidateComputedTextSize; }
	void setCandidateComputedTextSize(float size) { m_candidateComputedTextSize = size; }
	#endif

	StringView stringView(unsigned start = 0, std::optional<unsigned> stop = std::nullopt) const;

	bool containsOnlyCSSWhitespace(unsigned from, unsigned length) const;

	Vector<std::pair<unsigned, unsigned>> contentRangesBetweenOffsetsForType(const DocumentMarkerType, unsigned startOffset, unsigned endOffset) const;

	RenderInline* inlineWrapperForDisplayContents();
	void setInlineWrapperForDisplayContents(RenderInline*);

	template <typename MeasureTextCallback>
	static float measureTextConsideringPossibleTrailingSpace(bool currentCharacterIsSpace, unsigned startIndex, unsigned wordLength, WordTrailingSpace&, SingleThreadWeakHashSet<const Font>& fallbackFonts, MeasureTextCallback&&);

	static std::optional<bool> emphasisMarkExistsAndIsAbove(const RenderText&, const RenderStyle&);

	void resetMinMaxWidth();

	void setCanUseSimplifiedTextMeasuring(bool canUseSimplifiedTextMeasuring) { m_canUseSimplifiedTextMeasuring = canUseSimplifiedTextMeasuring; }
	std::optional<bool> canUseSimplifiedTextMeasuring() const { return m_canUseSimplifiedTextMeasuring; }
	void setHasPositionDependentContentWidth(bool hasPositionDependentContentWidth) { m_hasPositionDependentContentWidth = hasPositionDependentContentWidth; }
	std::optional<bool> hasPositionDependentContentWidth() const { return m_hasPositionDependentContentWidth; }
	void setHasStrongDirectionalityContent(bool hasStrongDirectionalityContent) { m_hasStrongDirectionalityContent = hasStrongDirectionalityContent; }
	std::optional<bool> hasStrongDirectionalityContent() const { return m_hasStrongDirectionalityContent; }

	protected:
	virtual void computePreferredLogicalWidths(float leadWidth, bool forcedMinMaxWidthComputation = false);
	void willBeDestroyed() override;

	virtual void setRenderedText(const String&);
	virtual Vector<char16_t> previousCharacter() const;

	virtual void setTextInternal(const String&, bool force);

	private:
	RenderText(Type, Node&, const String&);

	ASCIILiteral renderName() const override;

	bool canHaveChildren() const final { return false; }

	VisiblePosition positionForPoint(const LayoutPoint&, HitTestSource, const RenderFragmentContainer*) override;

	void setSelectionState(HighlightState) final;
	LayoutRect selectionRectForRepaint(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent = true) final;
	RepaintRects localRectsForRepaint(RepaintOutlineBounds) const final;

	void computePreferredLogicalWidths(float leadWidth, SingleThreadWeakHashSet<const Font>& fallbackFonts, GlyphOverflow&, bool forcedMinMaxWidthComputation = false);

	void computeFontCodePath();

	bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation&, const LayoutPoint&, HitTestAction) final { ASSERT_NOT_REACHED(); return false; }

	float widthFromCache(const FontCascade&, unsigned start, unsigned len, float xPos, SingleThreadWeakHashSet<const Font>* fallbackFonts, GlyphOverflow*, const RenderStyle&) const;
	bool computeUseBackslashAsYenSymbol() const;

	void secureText(char16_t mask);

	LayoutRect collectSelectionGeometriesForLineBoxes(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent, Vector<FloatQuad>*);

	void node() const = delete;
	void container() const = delete; // Use parent() instead.
	void container(const RenderLayerModelObject&, bool&) const = delete; // Use parent() instead.

	float maxWordFragmentWidth(const RenderStyle&, const FontCascade&, StringView word, unsigned minimumPrefixLength, unsigned minimumSuffixLength, bool currentCharacterIsSpace, unsigned characterIndex, float xPos, float entireWordWidth, WordTrailingSpace&, SingleThreadWeakHashSet<const Font>& fallbackFonts, GlyphOverflow&);
	float widthFromCacheConsideringPossibleTrailingSpace(const RenderStyle&, const FontCascade&, unsigned startIndex, unsigned wordLen, float xPos, bool currentCharacterIsSpace, WordTrailingSpace&, SingleThreadWeakHashSet<const Font>& fallbackFonts, GlyphOverflow&) const;
	void initiateFontLoadingByAccessingGlyphDataAndComputeCanUseSimplifiedTextMeasuring(const String&);

	#if ENABLE(TEXT_AUTOSIZING)
	// FIXME: This should probably be part of the text sizing structures in Document instead. That would save some memory.
	float m_candidateComputedTextSize { 0 };
	#endif
	Markable<float> m_minWidth;
	Markable<float> m_maxWidth;
	float m_beginMinWidth { 0 };
	float m_endMinWidth { 0 };

	String m_text;

	protected:
	std::optional<bool> m_canUseSimplifiedTextMeasuring;
	private:
	std::optional<bool> m_hasPositionDependentContentWidth;
	std::optional<bool> m_hasStrongDirectionalityContent;
	unsigned m_hasBreakableChar : 1 { false }; // Whether or not we can be broken into multiple lines.
	unsigned m_hasBreak : 1 { false }; // Whether or not we have a hard break (e.g., <pre> with '\n').
	unsigned m_hasTab : 1 { false }; // Whether or not we have a variable width tab character (e.g., <pre> with '\t').
	unsigned m_hasBeginWS : 1 { false }; // Whether or not we begin with WS (only true if we aren't pre)
	unsigned m_hasEndWS : 1 { false }; // Whether or not we end with WS (only true if we aren't pre)
	unsigned m_needsVisualReordering : 1 { false };
	unsigned m_containsOnlyASCII : 1 { false };
	mutable unsigned m_knownToHaveNoOverflowAndNoFallbackFonts : 1 { false };
	unsigned m_useBackslashAsYenSymbol : 1 { false };
	unsigned m_originalTextDiffersFromRendered : 1 { false };
	unsigned m_hasInlineWrapperForDisplayContents : 1 { false };
	unsigned m_hasSecureTextTimer : 1 { false };
	unsigned m_fontCodePath : 2 { 0 };
	};

	String applyTextTransform(const RenderStyle&, const String&, Vector<char16_t> previousCharacter);
	String applyTextTransform(const RenderStyle&, const String&);
	String capitalize(const String&, Vector<char16_t> previousCharacter);
	String capitalize(const String&);
	TextBreakIterator::LineMode::Behavior mapLineBreakToIteratorMode(LineBreak);
	TextBreakIterator::ContentAnalysis mapWordBreakToContentAnalysis(WordBreak);

	inline char16_t RenderText::characterAt(unsigned i) const
	{
	return i >= length() ? 0 : text()[i];
	}

	inline const RenderStyle& RenderText::style() const
	{
	return parent()->style();
	}

	inline const RenderStyle& RenderText::firstLineStyle() const
	{
	return parent()->firstLineStyle();
	}

	inline const RenderStyle* RenderText::getCachedPseudoStyle(const Style::PseudoElementIdentifier& pseudoElementIdentifier, const RenderStyle* parentStyle) const
	{
	// Pseudostyle is associated with an element, so ascend the tree until we find a non-anonymous ancestor.
	if (auto* ancestor = firstNonAnonymousAncestor())
	return ancestor->getCachedPseudoStyle(pseudoElementIdentifier, parentStyle);
	return nullptr;
	}

	inline Color RenderText::selectionBackgroundColor() const
	{
	if (auto* ancestor = firstNonAnonymousAncestor())
	return ancestor->selectionBackgroundColor();
	return Color();
	}

	inline Color RenderText::selectionForegroundColor() const
	{
	if (auto* ancestor = firstNonAnonymousAncestor())
	return ancestor->selectionForegroundColor();
	return Color();
	}

	inline Color RenderText::selectionEmphasisMarkColor() const
	{
	if (auto* ancestor = firstNonAnonymousAncestor())
	return ancestor->selectionEmphasisMarkColor();
	return Color();
	}

	inline std::unique_ptr<RenderStyle> RenderText::selectionPseudoStyle() const
	{
	if (auto* ancestor = firstNonAnonymousAncestor())
	return ancestor->selectionPseudoStyle();
	return nullptr;
	}

	inline const RenderStyle* RenderText::spellingErrorPseudoStyle() const
	{
	if (auto* ancestor = firstNonAnonymousAncestor())
	return ancestor->spellingErrorPseudoStyle();
	return nullptr;
	}

	inline const RenderStyle* RenderText::grammarErrorPseudoStyle() const
	{
	if (auto* ancestor = firstNonAnonymousAncestor())
	return ancestor->grammarErrorPseudoStyle();
	return nullptr;
	}

	inline const RenderStyle* RenderText::targetTextPseudoStyle() const
	{
	if (auto* ancestor = firstNonAnonymousAncestor())
	return ancestor->targetTextPseudoStyle();
	return nullptr;
	}

	inline RenderText* Text::renderer() const
	{
	return downcast<RenderText>(Node::renderer());
	}

	inline CheckedPtr<RenderText> Text::checkedRenderer() const
	{
	return renderer();
	}

	inline void RenderText::resetMinMaxWidth()
	{
	m_minWidth = { };
	m_maxWidth = { };
	}

	} // namespace WebCore

	SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderText, isRenderText())