319 lines
12 KiB
C++
319 lines
12 KiB
C++
/*
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* (C) 1999 Lars Knoll (knoll@kde.org)
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* (C) 2000 Dirk Mueller (mueller@kde.org)
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* Copyright (C) 2004-2017 Apple Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#pragma once
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#include "RenderElement.h"
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#include "RenderTextLineBoxes.h"
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#include "Text.h"
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#include <wtf/Forward.h>
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#include <wtf/text/TextBreakIterator.h>
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namespace WebCore {
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class Font;
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class LegacyInlineTextBox;
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struct GlyphOverflow;
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namespace LayoutIntegration {
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class LineLayout;
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}
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class RenderText : public RenderObject {
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WTF_MAKE_ISO_ALLOCATED(RenderText);
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public:
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RenderText(Text&, const String&);
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RenderText(Document&, const String&);
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virtual ~RenderText();
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WEBCORE_EXPORT Text* textNode() const;
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virtual bool isTextFragment() const;
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const RenderStyle& style() const;
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const RenderStyle& firstLineStyle() const;
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const RenderStyle* getCachedPseudoStyle(PseudoId, const RenderStyle* parentStyle = nullptr) const;
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Color selectionBackgroundColor() const;
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Color selectionForegroundColor() const;
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Color selectionEmphasisMarkColor() const;
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std::unique_ptr<RenderStyle> selectionPseudoStyle() const;
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virtual String originalText() const;
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void extractTextBox(LegacyInlineTextBox& box) { m_lineBoxes.extract(box); }
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void attachTextBox(LegacyInlineTextBox& box) { m_lineBoxes.attach(box); }
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void removeTextBox(LegacyInlineTextBox& box) { m_lineBoxes.remove(box); }
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StringImpl& text() const { return *m_text.impl(); } // Since m_text can never be null, returning this type means callers won't null check.
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String textWithoutConvertingBackslashToYenSymbol() const;
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LegacyInlineTextBox* createInlineTextBox() { return m_lineBoxes.createAndAppendLineBox(*this); }
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void dirtyLineBoxes(bool fullLayout);
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void deleteLineBoxes();
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void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const final;
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Vector<IntRect> absoluteRectsForRange(unsigned startOffset = 0, unsigned endOffset = UINT_MAX, bool useSelectionHeight = false, bool* wasFixed = nullptr) const;
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#if PLATFORM(IOS_FAMILY)
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void collectSelectionGeometries(Vector<SelectionGeometry>&, unsigned startOffset = 0, unsigned endOffset = std::numeric_limits<unsigned>::max()) final;
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#endif
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void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const final;
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Vector<FloatQuad> absoluteQuadsForRange(unsigned startOffset = 0, unsigned endOffset = UINT_MAX, bool useSelectionHeight = false, bool ignoreEmptyTextSelections = false, bool* wasFixed = nullptr) const;
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Vector<FloatQuad> absoluteQuadsClippedToEllipsis() const;
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Position positionForPoint(const LayoutPoint&) final;
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UChar characterAt(unsigned) const;
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unsigned length() const final { return text().length(); }
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void positionLineBox(LegacyInlineTextBox&);
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virtual float width(unsigned from, unsigned length, const FontCascade&, float xPos, HashSet<const Font*>* fallbackFonts = nullptr, GlyphOverflow* = nullptr) const;
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virtual float width(unsigned from, unsigned length, float xPos, bool firstLine = false, HashSet<const Font*>* fallbackFonts = nullptr, GlyphOverflow* = nullptr) const;
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float minLogicalWidth() const;
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float maxLogicalWidth() const;
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struct Widths {
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float min { 0 };
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float max { 0 };
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float beginMin { 0 };
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float endMin { 0 };
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float beginMax { 0 };
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float endMax { 0 };
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bool beginWS { false };
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bool endWS { false };
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bool hasBreakableChar { false };
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bool hasBreak { false };
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};
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Widths trimmedPreferredWidths(float leadWidth, bool& stripFrontSpaces);
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float hangablePunctuationStartWidth(unsigned index) const;
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float hangablePunctuationEndWidth(unsigned index) const;
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unsigned firstCharacterIndexStrippingSpaces() const;
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unsigned lastCharacterIndexStrippingSpaces() const;
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static bool isHangableStopOrComma(UChar);
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WEBCORE_EXPORT virtual IntRect linesBoundingBox() const;
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LayoutRect linesVisualOverflowBoundingBox() const;
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WEBCORE_EXPORT IntPoint firstRunLocation() const;
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virtual void setText(const String&, bool force = false);
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void setTextWithOffset(const String&, unsigned offset, unsigned len, bool force = false);
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bool canBeSelectionLeaf() const override { return true; }
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LayoutRect collectSelectionGeometriesForLineBoxes(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent, Vector<FloatQuad>&);
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LayoutUnit marginLeft() const { return minimumValueForLength(style().marginLeft(), 0); }
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LayoutUnit marginRight() const { return minimumValueForLength(style().marginRight(), 0); }
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LegacyInlineTextBox* firstTextBox() const { return m_lineBoxes.first(); }
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LegacyInlineTextBox* lastTextBox() const { return m_lineBoxes.last(); }
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int caretMinOffset() const final;
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int caretMaxOffset() const final;
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unsigned countRenderedCharacterOffsetsUntil(unsigned) const;
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bool containsRenderedCharacterOffset(unsigned) const;
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bool containsCaretOffset(unsigned) const;
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bool hasRenderedText() const;
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// FIXME: These should return unsigneds.
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int previousOffset(int current) const final;
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int previousOffsetForBackwardDeletion(int current) const final;
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int nextOffset(int current) const final;
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bool containsReversedText() const { return m_containsReversedText; }
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void momentarilyRevealLastTypedCharacter(unsigned offsetAfterLastTypedCharacter);
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LegacyInlineTextBox* findNextInlineTextBox(int offset, int& pos) const { return m_lineBoxes.findNext(offset, pos); }
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bool isAllCollapsibleWhitespace() const;
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bool canUseSimpleFontCodePath() const { return m_canUseSimpleFontCodePath; }
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void removeAndDestroyTextBoxes();
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virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle);
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virtual std::unique_ptr<LegacyInlineTextBox> createTextBox();
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#if ENABLE(TEXT_AUTOSIZING)
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float candidateComputedTextSize() const { return m_candidateComputedTextSize; }
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void setCandidateComputedTextSize(float size) { m_candidateComputedTextSize = size; }
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#endif
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bool usesLegacyLineLayoutPath() const;
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StringView stringView(unsigned start = 0, std::optional<unsigned> stop = std::nullopt) const;
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bool containsOnlyHTMLWhitespace(unsigned from, unsigned length) const;
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bool canUseSimplifiedTextMeasuring() const { return m_canUseSimplifiedTextMeasuring; }
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Vector<std::pair<unsigned, unsigned>> draggedContentRangesBetweenOffsets(unsigned startOffset, unsigned endOffset) const;
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RenderInline* inlineWrapperForDisplayContents();
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void setInlineWrapperForDisplayContents(RenderInline*);
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static RenderText* findByDisplayContentsInlineWrapperCandidate(RenderElement&);
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protected:
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virtual void computePreferredLogicalWidths(float leadWidth);
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void willBeDestroyed() override;
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virtual void setRenderedText(const String&);
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virtual UChar previousCharacter() const;
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RenderTextLineBoxes m_lineBoxes;
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private:
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RenderText(Node&, const String&);
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const char* renderName() const override;
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bool canHaveChildren() const final { return false; }
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VisiblePosition positionForPoint(const LayoutPoint&, const RenderFragmentContainer*) override;
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void setSelectionState(HighlightState) final;
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LayoutRect selectionRectForRepaint(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent = true) final;
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LayoutRect clippedOverflowRect(const RenderLayerModelObject* repaintContainer, VisibleRectContext) const final;
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void computePreferredLogicalWidths(float leadWidth, HashSet<const Font*>& fallbackFonts, GlyphOverflow&);
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bool computeCanUseSimpleFontCodePath() const;
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bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation&, const LayoutPoint&, HitTestAction) final { ASSERT_NOT_REACHED(); return false; }
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float widthFromCache(const FontCascade&, unsigned start, unsigned len, float xPos, HashSet<const Font*>* fallbackFonts, GlyphOverflow*, const RenderStyle&) const;
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bool computeUseBackslashAsYenSymbol() const;
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void secureText(UChar mask);
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LayoutRect collectSelectionGeometriesForLineBoxes(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent, Vector<FloatQuad>*);
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bool computeCanUseSimplifiedTextMeasuring() const;
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void node() const = delete;
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void container() const = delete; // Use parent() instead.
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void container(const RenderLayerModelObject&, bool&) const = delete; // Use parent() instead.
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// We put the bitfield first to minimize padding on 64-bit.
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unsigned m_hasBreakableChar : 1; // Whether or not we can be broken into multiple lines.
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unsigned m_hasBreak : 1; // Whether or not we have a hard break (e.g., <pre> with '\n').
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unsigned m_hasTab : 1; // Whether or not we have a variable width tab character (e.g., <pre> with '\t').
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unsigned m_hasBeginWS : 1; // Whether or not we begin with WS (only true if we aren't pre)
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unsigned m_hasEndWS : 1; // Whether or not we end with WS (only true if we aren't pre)
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unsigned m_linesDirty : 1; // This bit indicates that the text run has already dirtied specific
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// line boxes, and this hint will enable layoutInlineChildren to avoid
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// just dirtying everything when character data is modified (e.g., appended/inserted
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// or removed).
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unsigned m_containsReversedText : 1;
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unsigned m_isAllASCII : 1;
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unsigned m_canUseSimpleFontCodePath : 1;
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mutable unsigned m_knownToHaveNoOverflowAndNoFallbackFonts : 1;
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unsigned m_useBackslashAsYenSymbol : 1;
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unsigned m_originalTextDiffersFromRendered : 1;
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unsigned m_hasInlineWrapperForDisplayContents : 1;
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unsigned m_canUseSimplifiedTextMeasuring : 1;
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#if ENABLE(TEXT_AUTOSIZING)
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// FIXME: This should probably be part of the text sizing structures in Document instead. That would save some memory.
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float m_candidateComputedTextSize { 0 };
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#endif
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float m_minWidth { -1 };
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float m_maxWidth { -1 };
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float m_beginMinWidth { 0 };
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float m_endMinWidth { 0 };
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String m_text;
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};
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String applyTextTransform(const RenderStyle&, const String&, UChar previousCharacter);
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String capitalize(const String&, UChar previousCharacter);
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LineBreakIteratorMode mapLineBreakToIteratorMode(LineBreak);
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inline UChar RenderText::characterAt(unsigned i) const
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{
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return i >= length() ? 0 : text()[i];
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}
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inline const RenderStyle& RenderText::style() const
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{
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return parent()->style();
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}
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inline const RenderStyle& RenderText::firstLineStyle() const
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{
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return parent()->firstLineStyle();
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}
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inline const RenderStyle* RenderText::getCachedPseudoStyle(PseudoId pseudoId, const RenderStyle* parentStyle) const
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{
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// Pseudostyle is associated with an element, so ascend the tree until we find a non-anonymous ancestor.
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if (auto* ancestor = firstNonAnonymousAncestor())
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return ancestor->getCachedPseudoStyle(pseudoId, parentStyle);
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return nullptr;
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}
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inline Color RenderText::selectionBackgroundColor() const
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{
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if (auto* ancestor = firstNonAnonymousAncestor())
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return ancestor->selectionBackgroundColor();
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return Color();
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}
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inline Color RenderText::selectionForegroundColor() const
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{
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if (auto* ancestor = firstNonAnonymousAncestor())
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return ancestor->selectionForegroundColor();
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return Color();
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}
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inline Color RenderText::selectionEmphasisMarkColor() const
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{
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if (auto* ancestor = firstNonAnonymousAncestor())
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return ancestor->selectionEmphasisMarkColor();
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return Color();
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}
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inline std::unique_ptr<RenderStyle> RenderText::selectionPseudoStyle() const
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{
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if (auto* ancestor = firstNonAnonymousAncestor())
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return ancestor->selectionPseudoStyle();
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return nullptr;
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}
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inline RenderText* Text::renderer() const
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{
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return downcast<RenderText>(Node::renderer());
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}
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} // namespace WebCore
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SPECIALIZE_TYPE_TRAITS_RENDER_OBJECT(RenderText, isText())
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