252 lines
8.1 KiB
C++
252 lines
8.1 KiB
C++
/*
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* Copyright (C) 2019 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#if ENABLE(LAYOUT_FORMATTING_CONTEXT)
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#include "FontCascade.h"
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#include "LayoutIntegrationInlineContent.h"
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#include "TextBoxSelectableRange.h"
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namespace WebCore {
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namespace LayoutIntegration {
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class RunIteratorModernPath {
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public:
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RunIteratorModernPath(const InlineContent& inlineContent)
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: m_inlineContent(&inlineContent)
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{
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setAtEnd();
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}
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RunIteratorModernPath(const InlineContent& inlineContent, size_t startIndex)
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: m_inlineContent(&inlineContent)
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, m_runIndex(startIndex)
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{
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}
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bool isText() const { return !!run().textContent(); }
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FloatRect rect() const { return run().rect(); }
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bool isHorizontal() const { return true; }
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bool dirOverride() const { return false; }
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bool isLineBreak() const { return run().isLineBreak(); }
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unsigned minimumCaretOffset() const { return isText() ? start() : 0; }
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unsigned maximumCaretOffset() const { return isText() ? end() : 1; }
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unsigned char bidiLevel() const { return 0; }
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bool hasHyphen() const { return run().textContent()->hasHyphen(); }
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StringView text() const { return run().textContent()->originalContent(); }
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unsigned start() const { return run().textContent()->start(); }
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unsigned end() const { return run().textContent()->end(); }
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unsigned length() const { return run().textContent()->length(); }
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// FIXME: Make a shared generic version of this.
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inline unsigned offsetForPosition(float x) const
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{
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if (isLineBreak())
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return 0;
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auto rect = this->rect();
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auto localX = x - rect.x();
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if (localX > rect.width())
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return length();
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if (localX < 0)
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return 0;
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bool includePartialGlyphs = true;
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return run().style().fontCascade().offsetForPosition(createTextRun(HyphenMode::Ignore), localX, includePartialGlyphs);
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}
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// FIXME: Make a shared generic version of this.
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float positionForOffset(unsigned offset) const
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{
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ASSERT(offset >= start());
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ASSERT(offset <= end());
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if (isLineBreak())
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return rect().x();
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auto endOffset = selectableRange().clamp(offset);
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LayoutRect selectionRect = LayoutRect(rect().x(), 0, 0, 0);
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TextRun textRun = createTextRun(HyphenMode::Ignore);
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run().style().fontCascade().adjustSelectionRectForText(textRun, selectionRect, 0, endOffset);
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return snapRectToDevicePixelsWithWritingDirection(selectionRect, renderer().document().deviceScaleFactor(), textRun.ltr()).maxX();
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}
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bool isSelectable(unsigned start, unsigned end) const
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{
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return selectableRange().intersects(start, end);
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}
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LayoutRect selectionRect(unsigned rangeStart, unsigned rangeEnd) const
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{
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auto [clampedStart, clampedEnd] = selectableRange().clamp(rangeStart, rangeEnd);
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if (clampedStart >= clampedEnd && !(rangeStart == rangeEnd && rangeStart >= start() && rangeStart <= end()))
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return { };
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auto logicalLeft = LayoutUnit(isHorizontal() ? rect().x() : rect().y());
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auto logicalRight = LayoutUnit(isHorizontal() ? rect().maxX() : rect().maxY());
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auto logicalWidth = logicalRight - logicalLeft;
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// FIXME: These should share implementation with the line iterator.
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auto selectionTop = LayoutUnit::fromFloatRound(line().enclosingContentTop());
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auto selectionHeight = LayoutUnit::fromFloatRound(line().enclosingContentBottom() - line().enclosingContentTop());
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LayoutRect selectionRect { logicalLeft, selectionTop, logicalWidth, selectionHeight };
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TextRun textRun = createTextRun(HyphenMode::Include);
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if (clampedStart || clampedEnd != textRun.length())
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run().style().fontCascade().adjustSelectionRectForText(textRun, selectionRect, clampedStart, clampedEnd);
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return snappedSelectionRect(selectionRect, logicalRight, selectionTop, selectionHeight, isHorizontal());
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}
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const RenderObject& renderer() const
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{
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return m_inlineContent->rendererForLayoutBox(run().layoutBox());
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}
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void traverseNextTextRun()
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{
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ASSERT(!atEnd());
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ASSERT(run().textContent());
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auto& layoutBox = run().layoutBox();
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++m_runIndex;
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if (!atEnd() && &layoutBox != &run().layoutBox())
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setAtEnd();
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}
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void traverseNextTextRunInTextOrder()
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{
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// FIXME: No RTL in LFC.
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traverseNextTextRun();
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}
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void traverseNextOnLine()
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{
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ASSERT(!atEnd());
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auto oldLineIndex = run().lineIndex();
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++m_runIndex;
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if (!atEnd() && oldLineIndex != run().lineIndex())
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setAtEnd();
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}
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void traversePreviousOnLine()
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{
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ASSERT(!atEnd());
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if (!m_runIndex) {
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setAtEnd();
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return;
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}
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auto oldLineIndex = run().lineIndex();
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--m_runIndex;
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if (oldLineIndex != run().lineIndex())
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setAtEnd();
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}
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void traverseNextOnLineInLogicalOrder()
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{
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traverseNextOnLine();
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}
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void traversePreviousOnLineInLogicalOrder()
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{
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traversePreviousOnLine();
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}
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bool operator==(const RunIteratorModernPath& other) const { return m_inlineContent == other.m_inlineContent && m_runIndex == other.m_runIndex; }
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bool atEnd() const { return m_runIndex == runs().size() || !run().hasUnderlyingLayout(); }
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LegacyInlineBox* legacyInlineBox() const
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{
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return nullptr;
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}
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private:
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friend class PathRun;
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friend class RunIterator;
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TextBoxSelectableRange selectableRange() const
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{
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return {
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start(),
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length(),
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run().style().hyphenString().length(),
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run().isLineBreak()
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};
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}
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enum class HyphenMode { Include, Ignore };
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TextRun createTextRun(HyphenMode hyphenMode) const
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{
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auto& style = run().style();
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auto expansion = run().expansion();
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auto rect = this->rect();
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auto xPos = rect.x() - (line().lineBoxLeft() + line().contentLeft());
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auto textForRun = [&] {
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if (hyphenMode == HyphenMode::Ignore || !hasHyphen())
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return text().toStringWithoutCopying();
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return makeString(text(), style.hyphenString());
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}();
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TextRun textRun { textForRun, xPos, expansion.horizontalExpansion, expansion.behavior };
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textRun.setTabSize(!style.collapseWhiteSpace(), style.tabSize());
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return textRun;
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};
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void setAtEnd() { m_runIndex = runs().size(); }
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const InlineContent::Runs& runs() const { return m_inlineContent->runs; }
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const Run& run() const { return runs()[m_runIndex]; }
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const Line& line() const { return m_inlineContent->lineForRun(run()); }
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RefPtr<const InlineContent> m_inlineContent;
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size_t m_runIndex { 0 };
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};
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}
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}
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#endif
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