blob: f707e0d517becfcc2a6d1874165352e1bdcfa59b [file] [log] [blame]
/*
* (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 2000 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2004-2021 Apple Inc. All rights reserved.
* Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
* Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
*
* 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.
*
*/
#include "config.h"
#include "RenderText.h"
#include "AXObjectCache.h"
#include "BreakLines.h"
#include "BreakingContext.h"
#include "CharacterProperties.h"
#include "DocumentInlines.h"
#include "DocumentMarkerController.h"
#include "FloatQuad.h"
#include "Frame.h"
#include "FrameView.h"
#include "HTMLParserIdioms.h"
#include "Hyphenation.h"
#include "InlineIteratorLineBox.h"
#include "InlineIteratorLogicalOrderTraversal.h"
#include "InlineIteratorTextBox.h"
#include "InlineRunAndOffset.h"
#include "LayoutIntegrationLineLayout.h"
#include "LegacyEllipsisBox.h"
#include "LineSelection.h"
#include "Range.h"
#include "RenderBlock.h"
#include "RenderCombineText.h"
#include "RenderInline.h"
#include "RenderLayer.h"
#include "RenderTextInlines.h"
#include "RenderView.h"
#include "RenderedDocumentMarker.h"
#include "SVGElementTypeHelpers.h"
#include "SVGInlineTextBox.h"
#include "Settings.h"
#include "Text.h"
#include "TextResourceDecoder.h"
#include "VisiblePosition.h"
#include "WidthIterator.h"
#include <wtf/IsoMallocInlines.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/text/StringBuilder.h>
#include <wtf/text/TextBreakIterator.h>
#include <wtf/unicode/CharacterNames.h>
#if PLATFORM(IOS_FAMILY)
#include "Document.h"
#include "EditorClient.h"
#include "LogicalSelectionOffsetCaches.h"
#include "Page.h"
#include "SelectionGeometry.h"
#endif
namespace WebCore {
using namespace WTF::Unicode;
WTF_MAKE_ISO_ALLOCATED_IMPL(RenderText);
struct SameSizeAsRenderText : public RenderObject {
void* pointers[2];
uint32_t bitfields : 16;
#if ENABLE(TEXT_AUTOSIZING)
float candidateTextSize;
#endif
float widths[4];
String text;
};
static_assert(sizeof(RenderText) == sizeof(SameSizeAsRenderText), "RenderText should stay small");
class SecureTextTimer final : private TimerBase {
WTF_MAKE_FAST_ALLOCATED;
public:
explicit SecureTextTimer(RenderText&);
void restart(unsigned offsetAfterLastTypedCharacter);
unsigned takeOffsetAfterLastTypedCharacter();
private:
void fired() override;
RenderText& m_renderer;
unsigned m_offsetAfterLastTypedCharacter { 0 };
};
typedef HashMap<RenderText*, std::unique_ptr<SecureTextTimer>> SecureTextTimerMap;
static SecureTextTimerMap& secureTextTimers()
{
static NeverDestroyed<SecureTextTimerMap> map;
return map.get();
}
inline SecureTextTimer::SecureTextTimer(RenderText& renderer)
: m_renderer(renderer)
{
}
inline void SecureTextTimer::restart(unsigned offsetAfterLastTypedCharacter)
{
m_offsetAfterLastTypedCharacter = offsetAfterLastTypedCharacter;
startOneShot(1_s * m_renderer.settings().passwordEchoDurationInSeconds());
}
inline unsigned SecureTextTimer::takeOffsetAfterLastTypedCharacter()
{
unsigned offset = m_offsetAfterLastTypedCharacter;
m_offsetAfterLastTypedCharacter = 0;
return offset;
}
void SecureTextTimer::fired()
{
ASSERT(secureTextTimers().get(&m_renderer) == this);
m_offsetAfterLastTypedCharacter = 0;
m_renderer.setText(m_renderer.text(), true /* forcing setting text as it may be masked later */);
}
static HashMap<const RenderText*, String>& originalTextMap()
{
static NeverDestroyed<HashMap<const RenderText*, String>> map;
return map;
}
static HashMap<const RenderText*, WeakPtr<RenderInline>>& inlineWrapperForDisplayContentsMap()
{
static NeverDestroyed<HashMap<const RenderText*, WeakPtr<RenderInline>>> map;
return map;
}
static constexpr UChar convertNoBreakSpaceToSpace(UChar character)
{
return character == noBreakSpace ? ' ' : character;
}
String capitalize(const String& string, UChar previousCharacter)
{
// FIXME: Change this to use u_strToTitle instead of u_totitle and to consider locale.
unsigned length = string.length();
auto& stringImpl = *string.impl();
static_assert(String::MaxLength < std::numeric_limits<unsigned>::max(), "Must be able to add one without overflowing unsigned");
// Replace NO BREAK SPACE with a normal spaces since ICU does not treat it as a word separator.
Vector<UChar> stringWithPrevious(length + 1);
stringWithPrevious[0] = convertNoBreakSpaceToSpace(previousCharacter);
for (unsigned i = 1; i < length + 1; i++)
stringWithPrevious[i] = convertNoBreakSpaceToSpace(stringImpl[i - 1]);
auto* breakIterator = wordBreakIterator(StringView { stringWithPrevious.data(), length + 1 });
if (!breakIterator)
return string;
StringBuilder result;
result.reserveCapacity(length);
int32_t startOfWord = ubrk_first(breakIterator);
int32_t endOfWord;
for (endOfWord = ubrk_next(breakIterator); endOfWord != UBRK_DONE; startOfWord = endOfWord, endOfWord = ubrk_next(breakIterator)) {
if (startOfWord) // Do not append the first character, since it's the previous character, not from this string.
result.appendCharacter(u_totitle(stringImpl[startOfWord - 1]));
for (int i = startOfWord + 1; i < endOfWord; i++)
result.append(stringImpl[i - 1]);
}
return result == string ? string : result.toString();
}
inline RenderText::RenderText(Node& node, const String& text)
: RenderObject(node)
, m_hasTab(false)
, m_linesDirty(false)
, m_needsVisualReordering(false)
, m_isAllASCII(text.impl()->isAllASCII())
, m_knownToHaveNoOverflowAndNoFallbackFonts(false)
, m_useBackslashAsYenSymbol(false)
, m_originalTextDiffersFromRendered(false)
, m_hasInlineWrapperForDisplayContents(false)
, m_text(text)
{
ASSERT(!m_text.isNull());
setIsText();
m_canUseSimpleFontCodePath = computeCanUseSimpleFontCodePath();
}
RenderText::RenderText(Text& textNode, const String& text)
: RenderText(static_cast<Node&>(textNode), text)
{
}
RenderText::RenderText(Document& document, const String& text)
: RenderText(static_cast<Node&>(document), text)
{
}
RenderText::~RenderText()
{
// Do not add any code here. Add it to willBeDestroyed() instead.
ASSERT(!originalTextMap().contains(this));
}
ASCIILiteral RenderText::renderName() const
{
return "RenderText"_s;
}
Text* RenderText::textNode() const
{
return downcast<Text>(RenderObject::node());
}
bool RenderText::isTextFragment() const
{
return false;
}
bool RenderText::computeUseBackslashAsYenSymbol() const
{
const RenderStyle& style = this->style();
const auto& fontDescription = style.fontDescription();
if (style.fontCascade().useBackslashAsYenSymbol())
return true;
if (fontDescription.isSpecifiedFont())
return false;
const PAL::TextEncoding* encoding = document().decoder() ? &document().decoder()->encoding() : 0;
if (encoding && encoding->backslashAsCurrencySymbol() != '\\')
return true;
return false;
}
void RenderText::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
// There is no need to ever schedule repaints from a style change of a text run, since
// we already did this for the parent of the text run.
// We do have to schedule layouts, though, since a style change can force us to
// need to relayout.
if (diff == StyleDifference::Layout) {
setNeedsLayoutAndPrefWidthsRecalc();
m_knownToHaveNoOverflowAndNoFallbackFonts = false;
}
const RenderStyle& newStyle = style();
bool needsResetText = false;
if (!oldStyle) {
m_useBackslashAsYenSymbol = computeUseBackslashAsYenSymbol();
needsResetText = m_useBackslashAsYenSymbol;
} else if (oldStyle->fontCascade().useBackslashAsYenSymbol() != newStyle.fontCascade().useBackslashAsYenSymbol()) {
m_useBackslashAsYenSymbol = computeUseBackslashAsYenSymbol();
needsResetText = true;
}
if (!oldStyle || oldStyle->fontCascade() != newStyle.fontCascade())
m_canUseSimplifiedTextMeasuring = computeCanUseSimplifiedTextMeasuring();
TextTransform oldTransform = oldStyle ? oldStyle->textTransform() : TextTransform::None;
TextSecurity oldSecurity = oldStyle ? oldStyle->textSecurity() : TextSecurity::None;
if (needsResetText || oldTransform != newStyle.textTransform() || oldSecurity != newStyle.textSecurity())
RenderText::setText(originalText(), true);
}
void RenderText::removeAndDestroyTextBoxes()
{
if (!renderTreeBeingDestroyed())
m_lineBoxes.removeAllFromParent(*this);
#if !ASSERT_WITH_SECURITY_IMPLICATION_DISABLED
else
m_lineBoxes.invalidateParentChildLists();
#endif
deleteLineBoxes();
}
void RenderText::willBeDestroyed()
{
secureTextTimers().remove(this);
removeAndDestroyTextBoxes();
if (m_originalTextDiffersFromRendered)
originalTextMap().remove(this);
setInlineWrapperForDisplayContents(nullptr);
RenderObject::willBeDestroyed();
}
String RenderText::originalText() const
{
return m_originalTextDiffersFromRendered ? originalTextMap().get(this) : m_text;
}
void RenderText::absoluteRects(Vector<IntRect>& rects, const LayoutPoint& accumulatedOffset) const
{
for (auto& run : InlineIterator::textBoxesFor(*this)) {
auto rect = run.visualRectIgnoringBlockDirection();
rects.append(enclosingIntRect(FloatRect(accumulatedOffset + rect.location(), rect.size())));
}
}
Vector<IntRect> RenderText::absoluteRectsForRange(unsigned start, unsigned end, bool useSelectionHeight, bool* wasFixed) const
{
return absoluteQuadsForRange(start, end, useSelectionHeight, false /* ignoreEmptyTextSelections */, wasFixed).map([](auto& quad) {
return quad.enclosingBoundingBox();
});
}
#if PLATFORM(IOS_FAMILY)
// This function is similar in spirit to addLineBoxRects, but returns rectangles
// which are annotated with additional state which helps the iPhone draw selections in its unique way.
// Full annotations are added in this class.
void RenderText::collectSelectionGeometries(Vector<SelectionGeometry>& rects, unsigned start, unsigned end)
{
for (auto run = InlineIterator::firstTextBoxFor(*this); run; run = run.traverseNextTextBox()) {
LayoutRect rect;
if (start <= run->start() && run->end() <= end)
rect = run->selectionRect(start, end);
else {
unsigned realEnd = std::min(run->end(), end);
rect = run->selectionRect(start, realEnd);
if (rect.isEmpty())
continue;
}
if (run->lineBox()->isFirstAfterPageBreak()) {
if (run->isHorizontal())
rect.shiftYEdgeTo(run->lineBox()->top());
else
rect.shiftXEdgeTo(run->lineBox()->top());
}
RenderBlock* containingBlock = this->containingBlock();
// Map rect, extended left to leftOffset, and right to rightOffset, through transforms to get minX and maxX.
LogicalSelectionOffsetCaches cache(*containingBlock);
LayoutUnit leftOffset = containingBlock->logicalLeftSelectionOffset(*containingBlock, LayoutUnit(run->logicalTop()), cache);
LayoutUnit rightOffset = containingBlock->logicalRightSelectionOffset(*containingBlock, LayoutUnit(run->logicalTop()), cache);
LayoutRect extentsRect = rect;
if (run->isHorizontal()) {
extentsRect.setX(leftOffset);
extentsRect.setWidth(rightOffset - leftOffset);
} else {
extentsRect.setY(leftOffset);
extentsRect.setHeight(rightOffset - leftOffset);
}
extentsRect = localToAbsoluteQuad(FloatRect(extentsRect)).enclosingBoundingBox();
if (!run->isHorizontal())
extentsRect = extentsRect.transposedRect();
bool isFirstOnLine = !run->previousOnLine();
bool isLastOnLine = !run->nextOnLine();
if (containingBlock->isRubyBase() || containingBlock->isRubyText())
isLastOnLine = !containingBlock->containingBlock()->inlineBoxWrapper()->nextOnLineExists();
bool containsStart = run->start() <= start && run->end() >= start;
bool containsEnd = run->start() <= end && run->end() >= end;
bool isFixed = false;
auto absoluteQuad = localToAbsoluteQuad(FloatRect(rect), UseTransforms, &isFixed);
bool boxIsHorizontal = !is<SVGInlineTextBox>(run->legacyInlineBox()) ? run->isHorizontal() : !style().isVerticalWritingMode();
// If the containing block is an inline element, we want to check the inlineBoxWrapper orientation
// to determine the orientation of the block. In this case we also use the inlineBoxWrapper to
// determine if the element is the last on the line.
if (containingBlock->inlineBoxWrapper()) {
if (containingBlock->inlineBoxWrapper()->isHorizontal() != boxIsHorizontal) {
boxIsHorizontal = containingBlock->inlineBoxWrapper()->isHorizontal();
isLastOnLine = !containingBlock->inlineBoxWrapper()->nextOnLineExists();
}
}
rects.append(SelectionGeometry(absoluteQuad, HTMLElement::selectionRenderingBehavior(textNode()), run->direction(), extentsRect.x(), extentsRect.maxX(), extentsRect.maxY(), 0, run->isLineBreak(), isFirstOnLine, isLastOnLine, containsStart, containsEnd, boxIsHorizontal, isFixed, containingBlock->isRubyText(), view().pageNumberForBlockProgressionOffset(absoluteQuad.enclosingBoundingBox().x())));
}
}
#endif
static FloatRect boundariesForTextRun(const InlineIterator::TextBox& run)
{
if (is<SVGInlineTextBox>(run.legacyInlineBox()))
return downcast<SVGInlineTextBox>(*run.legacyInlineBox()).calculateBoundaries();
return run.visualRectIgnoringBlockDirection();
}
static IntRect ellipsisRectForTextRun(const InlineIterator::TextBox& run, unsigned start, unsigned end)
{
// FIXME: No ellipsis support in modern path yet.
if (!run.legacyInlineBox())
return { };
auto& box = *run.legacyInlineBox();
auto truncation = box.truncation();
if (!truncation)
return { };
auto ellipsis = box.root().ellipsisBox();
if (!ellipsis)
return { };
int ellipsisStartPosition = std::max<int>(start - box.start(), 0);
int ellipsisEndPosition = std::min<int>(end - box.start(), box.len());
// The ellipsis should be considered to be selected if the end of
// the selection is past the beginning of the truncation and the
// beginning of the selection is before or at the beginning of the truncation.
if (ellipsisEndPosition < *truncation && ellipsisStartPosition > *truncation)
return { };
return ellipsis->selectionRect();
}
enum class ClippingOption { NoClipping, ClipToEllipsis };
// FIXME: Unify with absoluteQuadsForRange.
static Vector<FloatQuad> collectAbsoluteQuads(const RenderText& textRenderer, bool* wasFixed, ClippingOption clipping)
{
Vector<FloatQuad> quads;
for (auto& run : InlineIterator::textBoxesFor(textRenderer)) {
auto boundaries = boundariesForTextRun(run);
// Shorten the width of this text box if it ends in an ellipsis.
if (clipping == ClippingOption::ClipToEllipsis) {
auto ellipsisRect = ellipsisRectForTextRun(run, 0, textRenderer.text().length());
if (!ellipsisRect.isEmpty()) {
if (textRenderer.style().isHorizontalWritingMode())
boundaries.setWidth(ellipsisRect.maxX() - boundaries.x());
else
boundaries.setHeight(ellipsisRect.maxY() - boundaries.y());
}
}
quads.append(textRenderer.localToAbsoluteQuad(boundaries, UseTransforms, wasFixed));
}
return quads;
}
Vector<FloatQuad> RenderText::absoluteQuadsClippedToEllipsis() const
{
return collectAbsoluteQuads(*this, nullptr, ClippingOption::ClipToEllipsis);
}
void RenderText::absoluteQuads(Vector<FloatQuad>& quads, bool* wasFixed) const
{
quads.appendVector(collectAbsoluteQuads(*this, wasFixed, ClippingOption::NoClipping));
}
static FloatRect localQuadForTextRun(const InlineIterator::TextBox& run, unsigned start, unsigned end, bool useSelectionHeight)
{
unsigned realEnd = std::min(run.end(), end);
LayoutRect boxSelectionRect = run.selectionRect(start, realEnd);
if (!boxSelectionRect.height())
return { };
if (useSelectionHeight)
return boxSelectionRect;
auto rect = run.visualRectIgnoringBlockDirection();
if (run.isHorizontal()) {
boxSelectionRect.setHeight(rect.height());
boxSelectionRect.setY(rect.y());
} else {
boxSelectionRect.setWidth(rect.width());
boxSelectionRect.setX(rect.x());
}
return boxSelectionRect;
}
Vector<FloatQuad> RenderText::absoluteQuadsForRange(unsigned start, unsigned end, bool useSelectionHeight, bool ignoreEmptyTextSelections, bool* wasFixed) const
{
// Work around signed/unsigned issues. This function takes unsigneds, and is often passed UINT_MAX
// to mean "all the way to the end". LegacyInlineTextBox coordinates are unsigneds, so changing this
// function to take ints causes various internal mismatches. But selectionRect takes ints, and
// passing UINT_MAX to it causes trouble. Ideally we'd change selectionRect to take unsigneds, but
// that would cause many ripple effects, so for now we'll just clamp our unsigned parameters to INT_MAX.
ASSERT(end == UINT_MAX || end <= INT_MAX);
ASSERT(start <= INT_MAX);
start = std::min(start, static_cast<unsigned>(INT_MAX));
end = std::min(end, static_cast<unsigned>(INT_MAX));
Vector<FloatQuad> quads;
for (auto& run : InlineIterator::textBoxesFor(*this)) {
if (ignoreEmptyTextSelections && !run.selectableRange().intersects(start, end))
continue;
if (start <= run.start() && run.end() <= end) {
auto boundaries = boundariesForTextRun(run);
if (useSelectionHeight) {
LayoutRect selectionRect = run.selectionRect(start, end);
if (run.isHorizontal()) {
boundaries.setHeight(selectionRect.height());
boundaries.setY(selectionRect.y());
} else {
boundaries.setWidth(selectionRect.width());
boundaries.setX(selectionRect.x());
}
}
quads.append(localToAbsoluteQuad(boundaries, UseTransforms, wasFixed));
continue;
}
FloatRect rect = localQuadForTextRun(run, start, end, useSelectionHeight);
if (!rect.isZero())
quads.append(localToAbsoluteQuad(rect, UseTransforms, wasFixed));
}
return quads;
}
Position RenderText::positionForPoint(const LayoutPoint& point)
{
return positionForPoint(point, nullptr).deepEquivalent();
}
enum ShouldAffinityBeDownstream { AlwaysDownstream, AlwaysUpstream, UpstreamIfPositionIsNotAtStart };
static bool lineDirectionPointFitsInBox(int pointLineDirection, const InlineIterator::TextBoxIterator& textRun, ShouldAffinityBeDownstream& shouldAffinityBeDownstream)
{
shouldAffinityBeDownstream = AlwaysDownstream;
// the x coordinate is equal to the left edge of this box
// the affinity must be downstream so the position doesn't jump back to the previous line
// except when box is the first box in the line
if (pointLineDirection <= textRun->logicalLeft()) {
shouldAffinityBeDownstream = !textRun->previousOnLine() ? UpstreamIfPositionIsNotAtStart : AlwaysDownstream;
return true;
}
#if !PLATFORM(IOS_FAMILY)
// and the x coordinate is to the left of the right edge of this box
// check to see if position goes in this box
if (pointLineDirection < textRun->logicalRight()) {
shouldAffinityBeDownstream = UpstreamIfPositionIsNotAtStart;
return true;
}
#endif
// box is first on line
// and the x coordinate is to the left of the first text box left edge
if (!textRun->previousOnLineIgnoringLineBreak() && pointLineDirection < textRun->logicalLeft())
return true;
if (!textRun->nextOnLineIgnoringLineBreak()) {
// box is last on line
// and the x coordinate is to the right of the last text box right edge
// generate VisiblePosition, use Affinity::Upstream affinity if possible
shouldAffinityBeDownstream = UpstreamIfPositionIsNotAtStart;
return true;
}
return false;
}
static VisiblePosition createVisiblePositionForBox(const InlineIterator::BoxIterator& run, unsigned offset, ShouldAffinityBeDownstream shouldAffinityBeDownstream)
{
auto affinity = VisiblePosition::defaultAffinity;
switch (shouldAffinityBeDownstream) {
case AlwaysDownstream:
affinity = Affinity::Downstream;
break;
case AlwaysUpstream:
affinity = Affinity::Upstream;
break;
case UpstreamIfPositionIsNotAtStart:
affinity = offset > run->minimumCaretOffset() ? Affinity::Upstream : Affinity::Downstream;
break;
}
return run->renderer().createVisiblePosition(offset, affinity);
}
static VisiblePosition createVisiblePositionAfterAdjustingOffsetForBiDi(const InlineIterator::TextBoxIterator& run, unsigned offset, ShouldAffinityBeDownstream shouldAffinityBeDownstream)
{
if (offset && offset < run->length())
return createVisiblePositionForBox(run, run->start() + offset, shouldAffinityBeDownstream);
bool positionIsAtStartOfBox = !offset;
if (positionIsAtStartOfBox == run->isLeftToRightDirection()) {
// offset is on the left edge
auto previousRun = run->previousOnLineIgnoringLineBreak();
if ((previousRun && previousRun->bidiLevel() == run->bidiLevel())
|| run->renderer().containingBlock()->style().direction() == run->direction()) // FIXME: left on 12CBA
return createVisiblePositionForBox(run, run->leftmostCaretOffset(), shouldAffinityBeDownstream);
if (previousRun && previousRun->bidiLevel() > run->bidiLevel()) {
// e.g. left of B in aDC12BAb
auto leftmostRun = previousRun;
for (; previousRun; previousRun.traversePreviousOnLineIgnoringLineBreak()) {
if (previousRun->bidiLevel() <= run->bidiLevel())
break;
leftmostRun = previousRun;
}
return createVisiblePositionForBox(leftmostRun, leftmostRun->rightmostCaretOffset(), shouldAffinityBeDownstream);
}
if (!previousRun || previousRun->bidiLevel() < run->bidiLevel()) {
// e.g. left of D in aDC12BAb
InlineIterator::BoxIterator rightmostRun = run;
for (auto nextRun = run->nextOnLineIgnoringLineBreak(); nextRun; nextRun.traverseNextOnLineIgnoringLineBreak()) {
if (nextRun->bidiLevel() < run->bidiLevel())
break;
rightmostRun = nextRun;
}
return createVisiblePositionForBox(rightmostRun,
run->isLeftToRightDirection() ? rightmostRun->maximumCaretOffset() : rightmostRun->minimumCaretOffset(), shouldAffinityBeDownstream);
}
return createVisiblePositionForBox(run, run->rightmostCaretOffset(), shouldAffinityBeDownstream);
}
auto nextRun = run->nextOnLineIgnoringLineBreak();
if ((nextRun && nextRun->bidiLevel() == run->bidiLevel())
|| run->renderer().containingBlock()->style().direction() == run->direction())
return createVisiblePositionForBox(run, run->rightmostCaretOffset(), shouldAffinityBeDownstream);
// offset is on the right edge
if (nextRun && nextRun->bidiLevel() > run->bidiLevel()) {
// e.g. right of C in aDC12BAb
auto rightmostRun = nextRun;
for (; nextRun; nextRun.traverseNextOnLineIgnoringLineBreak()) {
if (nextRun->bidiLevel() <= run->bidiLevel())
break;
rightmostRun = nextRun;
}
return createVisiblePositionForBox(rightmostRun, rightmostRun->leftmostCaretOffset(), shouldAffinityBeDownstream);
}
if (!nextRun || nextRun->bidiLevel() < run->bidiLevel()) {
// e.g. right of A in aDC12BAb
InlineIterator::BoxIterator leftmostRun = run;
for (auto previousRun = run->previousOnLineIgnoringLineBreak(); previousRun; previousRun.traversePreviousOnLineIgnoringLineBreak()) {
if (previousRun->bidiLevel() < run->bidiLevel())
break;
leftmostRun = previousRun;
}
return createVisiblePositionForBox(leftmostRun,
run->isLeftToRightDirection() ? leftmostRun->minimumCaretOffset() : leftmostRun->maximumCaretOffset(), shouldAffinityBeDownstream);
}
return createVisiblePositionForBox(run, run->leftmostCaretOffset(), shouldAffinityBeDownstream);
}
VisiblePosition RenderText::positionForPoint(const LayoutPoint& point, const RenderFragmentContainer*)
{
auto firstRun = InlineIterator::firstTextBoxFor(*this);
if (!firstRun || !text().length())
return createVisiblePosition(0, Affinity::Downstream);
LayoutUnit pointLineDirection = firstRun->isHorizontal() ? point.x() : point.y();
LayoutUnit pointBlockDirection = firstRun->isHorizontal() ? point.y() : point.x();
bool blocksAreFlipped = style().isFlippedBlocksWritingMode();
InlineIterator::TextBoxIterator lastRun;
for (auto run = firstRun; run; run.traverseNextTextBox()) {
if (run->isLineBreak() && !run->previousOnLine() && run->nextOnLine() && !run->nextOnLine()->isLineBreak())
run.traverseNextTextBox();
auto lineBox = run->lineBox();
auto top = LayoutUnit { std::min(previousLineBoxContentBottomOrBorderAndPadding(*lineBox), lineBox->contentLogicalTop()) };
if (pointBlockDirection > top || (!blocksAreFlipped && pointBlockDirection == top)) {
auto bottom = LineSelection::logicalBottom(*lineBox);
if (auto nextLineBox = lineBox->next())
bottom = std::min(bottom, nextLineBox->contentLogicalTop());
if (pointBlockDirection < bottom || (blocksAreFlipped && pointBlockDirection == bottom)) {
ShouldAffinityBeDownstream shouldAffinityBeDownstream;
#if PLATFORM(IOS_FAMILY)
if (pointLineDirection != run->logicalLeft() && point.x() < run->visualRectIgnoringBlockDirection().x() + run->logicalWidth()) {
int half = run->visualRectIgnoringBlockDirection().x() + run->logicalWidth() / 2;
auto affinity = point.x() < half ? Affinity::Downstream : Affinity::Upstream;
return createVisiblePosition(run->offsetForPosition(pointLineDirection) + run->start(), affinity);
}
#endif
if (lineDirectionPointFitsInBox(pointLineDirection, run, shouldAffinityBeDownstream))
return createVisiblePositionAfterAdjustingOffsetForBiDi(run, run->offsetForPosition(pointLineDirection), shouldAffinityBeDownstream);
}
}
lastRun = run;
}
if (lastRun) {
ShouldAffinityBeDownstream shouldAffinityBeDownstream;
lineDirectionPointFitsInBox(pointLineDirection, lastRun, shouldAffinityBeDownstream);
return createVisiblePositionAfterAdjustingOffsetForBiDi(lastRun, lastRun->offsetForPosition(pointLineDirection) + lastRun->start(), shouldAffinityBeDownstream);
}
return createVisiblePosition(0, Affinity::Downstream);
}
static inline std::optional<float> combineTextWidth(const RenderText& renderer, const FontCascade& fontCascade, const RenderStyle& style)
{
if (!style.hasTextCombine() || !is<RenderCombineText>(renderer))
return { };
auto& combineTextRenderer = downcast<RenderCombineText>(renderer);
return combineTextRenderer.isCombined() ? std::make_optional(combineTextRenderer.combinedTextWidth(fontCascade)) : std::nullopt;
}
ALWAYS_INLINE float RenderText::widthFromCache(const FontCascade& fontCascade, unsigned start, unsigned length, float xPos, HashSet<const Font*>* fallbackFonts, GlyphOverflow* glyphOverflow, const RenderStyle& style) const
{
if (auto width = combineTextWidth(*this, fontCascade, style))
return *width;
TextRun run = RenderBlock::constructTextRun(*this, start, length, style);
run.setCharacterScanForCodePath(!canUseSimpleFontCodePath());
run.setTabSize(!style.collapseWhiteSpace(), style.tabSize());
run.setXPos(xPos);
return fontCascade.width(run, fallbackFonts, glyphOverflow);
}
ALWAYS_INLINE float RenderText::widthFromCacheConsideringPossibleTrailingSpace(const RenderStyle& style, const FontCascade& font, unsigned startIndex, unsigned wordLen, float xPos, bool currentCharacterIsSpace, WordTrailingSpace& wordTrailingSpace, HashSet<const Font*>& fallbackFonts, GlyphOverflow& glyphOverflow) const
{
return measureTextConsideringPossibleTrailingSpace(currentCharacterIsSpace, startIndex, wordLen, wordTrailingSpace, fallbackFonts, [&] (unsigned from, unsigned len) {
return widthFromCache(font, from, len, xPos, &fallbackFonts, &glyphOverflow, style);
});
}
inline bool isHangablePunctuationAtLineStart(UChar c)
{
return U_GET_GC_MASK(c) & (U_GC_PS_MASK | U_GC_PI_MASK | U_GC_PF_MASK);
}
inline bool isHangablePunctuationAtLineEnd(UChar c)
{
return U_GET_GC_MASK(c) & (U_GC_PE_MASK | U_GC_PI_MASK | U_GC_PF_MASK);
}
float RenderText::hangablePunctuationStartWidth(unsigned index) const
{
unsigned length = text().length();
if (index >= length)
return 0;
if (!isHangablePunctuationAtLineStart(text()[index]))
return 0;
auto& style = this->style();
return widthFromCache(style.fontCascade(), index, 1, 0, 0, 0, style);
}
float RenderText::hangablePunctuationEndWidth(unsigned index) const
{
unsigned length = text().length();
if (index >= length)
return 0;
if (!isHangablePunctuationAtLineEnd(text()[index]))
return 0;
auto& style = this->style();
return widthFromCache(style.fontCascade(), index, 1, 0, 0, 0, style);
}
bool RenderText::isHangableStopOrComma(UChar c)
{
return c == 0x002C || c == 0x002E || c == 0x060C || c == 0x06D4 || c == 0x3001
|| c == 0x3002 || c == 0xFF0C || c == 0xFF0E || c == 0xFE50 || c == 0xFE51
|| c == 0xFE52 || c == 0xFF61 || c == 0xFF64;
}
unsigned RenderText::firstCharacterIndexStrippingSpaces() const
{
if (!style().collapseWhiteSpace())
return 0;
unsigned i = 0;
for (unsigned length = text().length() ; i < length; ++i) {
if (text()[i] != ' ' && (text()[i] != '\n' || style().preserveNewline()) && text()[i] != '\t')
break;
}
return i;
}
unsigned RenderText::lastCharacterIndexStrippingSpaces() const
{
if (!text().length())
return 0;
if (!style().collapseWhiteSpace())
return text().length() - 1;
int i = text().length() - 1;
for ( ; i >= 0; --i) {
if (text()[i] != ' ' && (text()[i] != '\n' || style().preserveNewline()) && text()[i] != '\t')
break;
}
return i;
}
RenderText::Widths RenderText::trimmedPreferredWidths(float leadWidth, bool& stripFrontSpaces)
{
auto& style = this->style();
bool collapseWhiteSpace = style.collapseWhiteSpace();
if (!collapseWhiteSpace)
stripFrontSpaces = false;
if (m_hasTab || preferredLogicalWidthsDirty())
computePreferredLogicalWidths(leadWidth);
Widths widths;
widths.beginWS = !stripFrontSpaces && m_hasBeginWS;
widths.endWS = m_hasEndWS;
unsigned length = this->length();
if (!length || (stripFrontSpaces && text().isAllSpecialCharacters<isHTMLSpace>()))
return widths;
widths.min = m_minWidth;
widths.max = m_maxWidth;
widths.beginMin = m_beginMinWidth;
widths.endMin = m_endMinWidth;
widths.hasBreakableChar = m_hasBreakableChar;
widths.hasBreak = m_hasBreak;
widths.endsWithBreak = m_hasBreak && text()[length - 1] == '\n';
if (text()[0] == ' ' || (text()[0] == '\n' && !style.preserveNewline()) || text()[0] == '\t') {
auto& font = style.fontCascade(); // FIXME: This ignores first-line.
if (stripFrontSpaces)
widths.max -= font.width(RenderBlock::constructTextRun(&space, 1, style));
else
widths.max += font.wordSpacing();
}
stripFrontSpaces = collapseWhiteSpace && m_hasEndWS;
if (!style.autoWrap() || widths.min > widths.max)
widths.min = widths.max;
// Compute our max widths by scanning the string for newlines.
if (widths.hasBreak) {
auto& font = style.fontCascade(); // FIXME: This ignores first-line.
bool firstLine = true;
widths.beginMax = widths.max;
widths.endMax = widths.max;
for (unsigned i = 0; i < length; i++) {
unsigned lineLength = 0;
while (i + lineLength < length && text()[i + lineLength] != '\n')
lineLength++;
if (lineLength) {
widths.endMax = widthFromCache(font, i, lineLength, leadWidth + widths.endMax, 0, 0, style);
if (firstLine) {
firstLine = false;
leadWidth = 0;
widths.beginMax = widths.endMax;
}
i += lineLength;
} else if (firstLine) {
widths.beginMax = 0;
firstLine = false;
leadWidth = 0;
}
if (i == length - 1) {
// A <pre> run that ends with a newline, as in, e.g.,
// <pre>Some text\n\n<span>More text</pre>
widths.endMax = 0;
}
}
}
return widths;
}
static inline bool isSpaceAccordingToStyle(UChar c, const RenderStyle& style)
{
return c == ' ' || (c == noBreakSpace && style.nbspMode() == NBSPMode::Space);
}
float RenderText::minLogicalWidth() const
{
if (preferredLogicalWidthsDirty())
const_cast<RenderText*>(this)->computePreferredLogicalWidths(0);
return m_minWidth;
}
float RenderText::maxLogicalWidth() const
{
if (preferredLogicalWidthsDirty())
const_cast<RenderText*>(this)->computePreferredLogicalWidths(0);
return m_maxWidth;
}
LineBreakIteratorMode mapLineBreakToIteratorMode(LineBreak lineBreak)
{
switch (lineBreak) {
case LineBreak::Auto:
case LineBreak::AfterWhiteSpace:
case LineBreak::Anywhere:
return LineBreakIteratorMode::Default;
case LineBreak::Loose:
return LineBreakIteratorMode::Loose;
case LineBreak::Normal:
return LineBreakIteratorMode::Normal;
case LineBreak::Strict:
return LineBreakIteratorMode::Strict;
}
ASSERT_NOT_REACHED();
return LineBreakIteratorMode::Default;
}
void RenderText::computePreferredLogicalWidths(float leadWidth)
{
HashSet<const Font*> fallbackFonts;
GlyphOverflow glyphOverflow;
computePreferredLogicalWidths(leadWidth, fallbackFonts, glyphOverflow);
if (fallbackFonts.isEmpty() && !glyphOverflow.left && !glyphOverflow.right && !glyphOverflow.top && !glyphOverflow.bottom)
m_knownToHaveNoOverflowAndNoFallbackFonts = true;
}
static inline float hyphenWidth(RenderText& renderer, const FontCascade& font)
{
const RenderStyle& style = renderer.style();
auto textRun = RenderBlock::constructTextRun(style.hyphenString().string(), style);
return font.width(textRun);
}
float RenderText::maxWordFragmentWidth(const RenderStyle& style, const FontCascade& font, StringView word, unsigned minimumPrefixLength, unsigned minimumSuffixLength, bool currentCharacterIsSpace, unsigned characterIndex, float xPos, float entireWordWidth, WordTrailingSpace& wordTrailingSpace, HashSet<const Font*>& fallbackFonts, GlyphOverflow& glyphOverflow)
{
unsigned suffixStart = 0;
if (word.length() <= minimumSuffixLength)
return entireWordWidth;
Vector<int, 8> hyphenLocations;
ASSERT(word.length() >= minimumSuffixLength);
unsigned hyphenLocation = word.length() - minimumSuffixLength;
while ((hyphenLocation = lastHyphenLocation(word, hyphenLocation, style.computedLocale())) >= std::max(minimumPrefixLength, 1U))
hyphenLocations.append(hyphenLocation);
if (hyphenLocations.isEmpty())
return entireWordWidth;
hyphenLocations.reverse();
// Consider the word "ABC-DEF-GHI" (where the '-' characters are hyphenation opportunities). We want to measure the width
// of "ABC-" and "DEF-", but not "GHI-". Instead, we should measure "GHI" the same way we measure regular unhyphenated
// words (by using wordTrailingSpace). Therefore, this function is split up into two parts - one that measures each prefix,
// and one that measures the single last suffix.
// FIXME: Breaking the string at these places in the middle of words doesn't work with complex text.
float minimumFragmentWidthToConsider = font.pixelSize() * 5 / 4 + hyphenWidth(*this, font);
float maxFragmentWidth = 0;
for (size_t k = 0; k < hyphenLocations.size(); ++k) {
int fragmentLength = hyphenLocations[k] - suffixStart;
StringBuilder fragmentWithHyphen;
fragmentWithHyphen.append(word.substring(suffixStart, fragmentLength));
fragmentWithHyphen.append(style.hyphenString());
TextRun run = RenderBlock::constructTextRun(fragmentWithHyphen.toString(), style);
run.setCharacterScanForCodePath(!canUseSimpleFontCodePath());
float fragmentWidth = font.width(run, &fallbackFonts, &glyphOverflow);
// Narrow prefixes are ignored. See tryHyphenating in RenderBlockLineLayout.cpp.
if (fragmentWidth <= minimumFragmentWidthToConsider)
continue;
suffixStart += fragmentLength;
maxFragmentWidth = std::max(maxFragmentWidth, fragmentWidth);
}
if (!suffixStart) {
// We didn't find any hyphenation opportunities that we're willing to actually use.
// Therefore, the width of the maximum fragment is just ... the width of the entire word.
return entireWordWidth;
}
auto suffixWidth = widthFromCacheConsideringPossibleTrailingSpace(style, font, characterIndex + suffixStart, word.length() - suffixStart, xPos, currentCharacterIsSpace, wordTrailingSpace, fallbackFonts, glyphOverflow);
return std::max(maxFragmentWidth, suffixWidth);
}
void RenderText::computePreferredLogicalWidths(float leadWidth, HashSet<const Font*>& fallbackFonts, GlyphOverflow& glyphOverflow)
{
ASSERT(m_hasTab || preferredLogicalWidthsDirty() || !m_knownToHaveNoOverflowAndNoFallbackFonts);
m_minWidth = 0;
m_beginMinWidth = 0;
m_endMinWidth = 0;
m_maxWidth = 0;
float currMaxWidth = 0;
m_hasBreakableChar = false;
m_hasBreak = false;
m_hasTab = false;
m_hasBeginWS = false;
m_hasEndWS = false;
auto& style = this->style();
auto& font = style.fontCascade(); // FIXME: This ignores first-line.
float wordSpacing = font.wordSpacing();
auto& string = text();
unsigned length = string.length();
auto iteratorMode = mapLineBreakToIteratorMode(style.lineBreak());
LazyLineBreakIterator breakIterator(string, style.computedLocale(), iteratorMode);
bool needsWordSpacing = false;
bool ignoringSpaces = false;
bool isSpace = false;
bool firstWord = true;
bool firstLine = true;
std::optional<unsigned> nextBreakable;
unsigned lastWordBoundary = 0;
WordTrailingSpace wordTrailingSpace(style);
// If automatic hyphenation is allowed, we keep track of the width of the widest word (or word
// fragment) encountered so far, and only try hyphenating words that are wider.
float maxWordWidth = std::numeric_limits<float>::max();
unsigned minimumPrefixLength = 0;
unsigned minimumSuffixLength = 0;
if (style.hyphens() == Hyphens::Auto && canHyphenate(style.computedLocale())) {
maxWordWidth = 0;
// Map 'hyphenate-limit-{before,after}: auto;' to 2.
auto before = style.hyphenationLimitBefore();
minimumPrefixLength = before < 0 ? 2 : before;
auto after = style.hyphenationLimitAfter();
minimumSuffixLength = after < 0 ? 2 : after;
}
std::optional<LayoutUnit> firstGlyphLeftOverflow;
bool breakNBSP = style.autoWrap() && style.nbspMode() == NBSPMode::Space;
bool breakAnywhere = style.lineBreak() == LineBreak::Anywhere && style.autoWrap();
// Note the deliberate omission of word-wrap/overflow-wrap's break-word value from this breakAll check.
// Those do not affect minimum preferred sizes. Note that break-word is a non-standard value for
// word-break, but we support it as though it means break-all.
bool breakAll = (style.wordBreak() == WordBreak::BreakAll || style.wordBreak() == WordBreak::BreakWord || style.overflowWrap() == OverflowWrap::Anywhere) && style.autoWrap();
bool keepAllWords = style.wordBreak() == WordBreak::KeepAll;
bool canUseLineBreakShortcut = iteratorMode == LineBreakIteratorMode::Default;
for (unsigned i = 0; i < length; i++) {
UChar c = string[i];
bool previousCharacterIsSpace = isSpace;
bool isNewline = false;
if (c == '\n') {
if (style.preserveNewline()) {
m_hasBreak = true;
isNewline = true;
isSpace = false;
} else
isSpace = true;
} else if (c == '\t') {
if (!style.collapseWhiteSpace()) {
m_hasTab = true;
isSpace = false;
} else
isSpace = true;
} else
isSpace = c == ' ';
if ((isSpace || isNewline) && !i)
m_hasBeginWS = true;
if ((isSpace || isNewline) && i == length - 1)
m_hasEndWS = true;
ignoringSpaces |= style.collapseWhiteSpace() && previousCharacterIsSpace && isSpace;
ignoringSpaces &= isSpace;
// Ignore spaces and soft hyphens
if (ignoringSpaces) {
ASSERT(lastWordBoundary == i);
lastWordBoundary++;
continue;
} else if (c == softHyphen && style.hyphens() != Hyphens::None) {
ASSERT(i >= lastWordBoundary);
currMaxWidth += widthFromCache(font, lastWordBoundary, i - lastWordBoundary, leadWidth + currMaxWidth, &fallbackFonts, &glyphOverflow, style);
if (!firstGlyphLeftOverflow)
firstGlyphLeftOverflow = glyphOverflow.left;
lastWordBoundary = i + 1;
continue;
}
bool hasBreak = breakAll || isBreakable(breakIterator, i, nextBreakable, breakNBSP, canUseLineBreakShortcut, keepAllWords, breakAnywhere);
bool betweenWords = true;
unsigned j = i;
while (c != '\n' && !isSpaceAccordingToStyle(c, style) && c != '\t' && (c != softHyphen || style.hyphens() == Hyphens::None)) {
UChar previousCharacter = c;
j++;
if (j == length)
break;
c = string[j];
if (U_IS_LEAD(previousCharacter) && U_IS_TRAIL(c))
continue;
if (isBreakable(breakIterator, j, nextBreakable, breakNBSP, canUseLineBreakShortcut, keepAllWords, breakAnywhere) && characterAt(j - 1) != softHyphen)
break;
if (breakAll) {
// FIXME: This code is ultra wrong.
// The spec says "word-break: break-all: Any typographic letter units are treated as ID(“ideographic characters”) for the purpose of line-breaking."
// The spec describes how a "typographic letter unit" is a cluster, not a code point: https://drafts.csswg.org/css-text-3/#typographic-character-unit
betweenWords = false;
break;
}
}
unsigned wordLen = j - i;
if (wordLen) {
float currMinWidth = 0;
bool isSpace = (j < length) && isSpaceAccordingToStyle(c, style);
float w = widthFromCacheConsideringPossibleTrailingSpace(style, font, i, wordLen, leadWidth + currMaxWidth, isSpace, wordTrailingSpace, fallbackFonts, glyphOverflow);
if (c == softHyphen && style.hyphens() != Hyphens::None)
currMinWidth = hyphenWidth(*this, font);
if (w > maxWordWidth) {
auto maxFragmentWidth = maxWordFragmentWidth(style, font, StringView(string).substring(i, wordLen), minimumPrefixLength, minimumSuffixLength, isSpace, i, leadWidth + currMaxWidth, w, wordTrailingSpace, fallbackFonts, glyphOverflow);
currMinWidth += maxFragmentWidth - w; // This, when combined with "currMinWidth += w" below, has the effect of executing "currMinWidth += maxFragmentWidth" instead.
maxWordWidth = std::max(maxWordWidth, maxFragmentWidth);
}
if (!firstGlyphLeftOverflow)
firstGlyphLeftOverflow = glyphOverflow.left;
currMinWidth += w;
if (betweenWords) {
if (lastWordBoundary == i)
currMaxWidth += w;
else {
ASSERT(j >= lastWordBoundary);
currMaxWidth += widthFromCache(font, lastWordBoundary, j - lastWordBoundary, leadWidth + currMaxWidth, &fallbackFonts, &glyphOverflow, style);
}
lastWordBoundary = j;
}
bool isCollapsibleWhiteSpace = (j < length) && style.isCollapsibleWhiteSpace(c);
if (j < length && style.autoWrap())
m_hasBreakableChar = true;
// Add in wordSpacing to our currMaxWidth, but not if this is the last word on a line or the
// last word in the run.
if ((isSpace || isCollapsibleWhiteSpace) && !containsOnlyHTMLWhitespace(j, length - j))
currMaxWidth += wordSpacing;
if (firstWord) {
firstWord = false;
// If the first character in the run is breakable, then we consider ourselves to have a beginning
// minimum width of 0, since a break could occur right before our run starts, preventing us from ever
// being appended to a previous text run when considering the total minimum width of the containing block.
if (hasBreak)
m_hasBreakableChar = true;
m_beginMinWidth = hasBreak ? 0 : currMinWidth;
}
m_endMinWidth = currMinWidth;
m_minWidth = std::max(currMinWidth, m_minWidth);
i += wordLen - 1;
} else {
// Nowrap can never be broken, so don't bother setting the
// breakable character boolean. Pre can only be broken if we encounter a newline.
if (style.autoWrap() || isNewline)
m_hasBreakableChar = true;
if (isNewline) { // Only set if preserveNewline was true and we saw a newline.
if (firstLine) {
firstLine = false;
leadWidth = 0;
if (!style.autoWrap())
m_beginMinWidth = currMaxWidth;
}
if (currMaxWidth > m_maxWidth)
m_maxWidth = currMaxWidth;
currMaxWidth = 0;
} else {
TextRun run = RenderBlock::constructTextRun(*this, i, 1, style);
run.setTabSize(!style.collapseWhiteSpace(), style.tabSize());
run.setXPos(leadWidth + currMaxWidth);
currMaxWidth += font.width(run, &fallbackFonts);
glyphOverflow.right = 0;
needsWordSpacing = isSpace && !previousCharacterIsSpace && i == length - 1;
}
ASSERT(lastWordBoundary == i);
lastWordBoundary++;
}
}
glyphOverflow.left = firstGlyphLeftOverflow.value_or(glyphOverflow.left);
if ((needsWordSpacing && length > 1) || (ignoringSpaces && !firstWord))
currMaxWidth += wordSpacing;
m_maxWidth = std::max(currMaxWidth, m_maxWidth);
if (!style.autoWrap())
m_minWidth = m_maxWidth;
if (style.whiteSpace() == WhiteSpace::Pre) {
if (firstLine)
m_beginMinWidth = m_maxWidth;
m_endMinWidth = currMaxWidth;
}
setPreferredLogicalWidthsDirty(false);
}
template<typename CharacterType> static inline bool isAllCollapsibleWhitespace(const CharacterType* characters, unsigned length, const RenderStyle& style)
{
for (unsigned i = 0; i < length; ++i) {
if (!style.isCollapsibleWhiteSpace(characters[i]))
return false;
}
return true;
}
bool RenderText::isAllCollapsibleWhitespace() const
{
if (text().is8Bit())
return WebCore::isAllCollapsibleWhitespace(text().characters8(), text().length(), style());
return WebCore::isAllCollapsibleWhitespace(text().characters16(), text().length(), style());
}
template<typename CharacterType> static inline bool isAllPossiblyCollapsibleWhitespace(const CharacterType* characters, unsigned length)
{
for (unsigned i = 0; i < length; ++i) {
if (!(characters[i] == '\n' || characters[i] == ' ' || characters[i] == '\t'))
return false;
}
return true;
}
bool RenderText::containsOnlyHTMLWhitespace(unsigned from, unsigned length) const
{
ASSERT(from <= text().length());
ASSERT(length <= text().length());
ASSERT(from + length <= text().length());
if (text().is8Bit())
return isAllPossiblyCollapsibleWhitespace(text().characters8() + from, length);
return isAllPossiblyCollapsibleWhitespace(text().characters16() + from, length);
}
Vector<std::pair<unsigned, unsigned>> RenderText::draggedContentRangesBetweenOffsets(unsigned startOffset, unsigned endOffset) const
{
if (!textNode())
return { };
auto markers = document().markers().markersFor(*textNode(), DocumentMarker::DraggedContent);
if (markers.isEmpty())
return { };
Vector<std::pair<unsigned, unsigned>> draggedContentRanges;
for (auto* marker : markers) {
unsigned markerStart = std::max(marker->startOffset(), startOffset);
unsigned markerEnd = std::min(marker->endOffset(), endOffset);
if (markerStart >= markerEnd || markerStart > endOffset || markerEnd < startOffset)
continue;
std::pair<unsigned, unsigned> draggedContentRange;
draggedContentRange.first = markerStart;
draggedContentRange.second = markerEnd;
draggedContentRanges.append(draggedContentRange);
}
return draggedContentRanges;
}
IntPoint RenderText::firstRunLocation() const
{
auto first = InlineIterator::firstTextBoxFor(*this);
if (!first)
return { };
return IntPoint(first->visualRectIgnoringBlockDirection().location());
}
void RenderText::setSelectionState(HighlightState state)
{
RenderObject::setSelectionState(state);
// The containing block can be null in case of an orphaned tree.
RenderBlock* containingBlock = this->containingBlock();
if (containingBlock && !containingBlock->isRenderView())
containingBlock->setSelectionState(state);
}
void RenderText::setTextWithOffset(const String& newText, unsigned offset, unsigned length, bool force)
{
if (!force && text() == newText)
return;
int delta = newText.length() - text().length();
unsigned end = offset + length;
m_linesDirty = m_lineBoxes.dirtyRange(*this, offset, end, delta);
setText(newText, force || m_linesDirty);
}
static inline bool isInlineFlowOrEmptyText(const RenderObject& renderer)
{
return is<RenderInline>(renderer) || (is<RenderText>(renderer) && downcast<RenderText>(renderer).text().isEmpty());
}
UChar RenderText::previousCharacter() const
{
// find previous text renderer if one exists
const RenderObject* previousText = this;
while ((previousText = previousText->previousInPreOrder())) {
if (!isInlineFlowOrEmptyText(*previousText))
break;
}
if (!is<RenderText>(previousText))
return ' ';
auto& previousString = downcast<RenderText>(*previousText).text();
return previousString[previousString.length() - 1];
}
String applyTextTransform(const RenderStyle& style, const String& text, UChar previousCharacter)
{
switch (style.textTransform()) {
case TextTransform::None:
return text;
case TextTransform::Capitalize:
return capitalize(text, previousCharacter); // FIXME: Need to take locale into account.
case TextTransform::Uppercase:
return text.convertToUppercaseWithLocale(style.computedLocale());
case TextTransform::Lowercase:
return text.convertToLowercaseWithLocale(style.computedLocale());
}
ASSERT_NOT_REACHED();
return text;
}
void RenderText::setRenderedText(const String& newText)
{
ASSERT(!newText.isNull());
String originalText = this->originalText();
m_text = newText;
if (m_useBackslashAsYenSymbol)
m_text = makeStringByReplacingAll(m_text, '\\', yenSign);
const auto& style = this->style();
if (style.textTransform() != TextTransform::None)
m_text = applyTextTransform(style, m_text, previousCharacter());
// At rendering time, if certain fonts are used, these characters get swapped out with higher-quality PUA characters.
// See RenderBlock::updateSecurityDiscCharacters().
switch (style.textSecurity()) {
case TextSecurity::None:
break;
#if !PLATFORM(IOS_FAMILY)
// We use the same characters here as for list markers.
// See the listMarkerText function in RenderListMarker.cpp.
case TextSecurity::Circle:
secureText(whiteBullet);
break;
case TextSecurity::Disc:
secureText(bullet);
break;
case TextSecurity::Square:
secureText(blackSquare);
break;
#else
// FIXME: Why this quirk on iOS?
case TextSecurity::Circle:
case TextSecurity::Disc:
case TextSecurity::Square:
secureText(blackCircle);
break;
#endif
}
m_isAllASCII = text().isAllASCII();
m_canUseSimpleFontCodePath = computeCanUseSimpleFontCodePath();
m_canUseSimplifiedTextMeasuring = computeCanUseSimplifiedTextMeasuring();
if (m_text != originalText) {
originalTextMap().set(this, originalText);
m_originalTextDiffersFromRendered = true;
} else if (m_originalTextDiffersFromRendered) {
originalTextMap().remove(this);
m_originalTextDiffersFromRendered = false;
}
}
void RenderText::secureText(UChar maskingCharacter)
{
// This hides the text by replacing all the characters with the masking character.
// Offsets within the hidden text have to match offsets within the original text
// to handle things like carets and selection, so this won't work right if any
// of the characters are surrogate pairs or combining marks. Thus, this function
// does not attempt to handle either of those.
unsigned length = text().length();
if (!length)
return;
UChar characterToReveal = 0;
unsigned revealedCharactersOffset = 0;
if (SecureTextTimer* timer = secureTextTimers().get(this)) {
// We take the offset out of the timer to make this one-shot. We count on this being called only once.
// If it's called a second time we assume the text is different and a character should not be revealed.
revealedCharactersOffset = timer->takeOffsetAfterLastTypedCharacter();
if (revealedCharactersOffset && revealedCharactersOffset <= length)
characterToReveal = text()[--revealedCharactersOffset];
}
UChar* characters;
m_text = String::createUninitialized(length, characters);
for (unsigned i = 0; i < length; ++i)
characters[i] = maskingCharacter;
if (characterToReveal)
characters[revealedCharactersOffset] = characterToReveal;
}
bool RenderText::computeCanUseSimplifiedTextMeasuring() const
{
if (!m_canUseSimpleFontCodePath)
return false;
// FIXME: All these checks should be more fine-grained at the inline item level.
auto& style = this->style();
auto& fontCascade = style.fontCascade();
if (fontCascade.wordSpacing() || fontCascade.letterSpacing())
return false;
// Additional check on the font codepath.
TextRun run(m_text);
run.setCharacterScanForCodePath(false);
if (fontCascade.codePath(run) != FontCascade::CodePath::Simple)
return false;
if (&style != &firstLineStyle() && fontCascade != firstLineStyle().fontCascade())
return false;
auto& primaryFont = fontCascade.primaryFont();
if (primaryFont.syntheticBoldOffset())
return false;
auto whitespaceIsCollapsed = style.collapseWhiteSpace();
for (unsigned i = 0; i < text().length(); ++i) {
auto character = text()[i];
if (!WidthIterator::characterCanUseSimplifiedTextMeasuring(character, whitespaceIsCollapsed))
return false;
auto glyphData = fontCascade.glyphDataForCharacter(character, false);
if (!glyphData.isValid() || glyphData.font != &primaryFont)
return false;
}
return true;
}
void RenderText::setText(const String& text, bool force)
{
ASSERT(!text.isNull());
if (!force && text == originalText())
return;
m_text = text;
if (m_originalTextDiffersFromRendered) {
originalTextMap().remove(this);
m_originalTextDiffersFromRendered = false;
}
setRenderedText(text);
setNeedsLayoutAndPrefWidthsRecalc();
m_knownToHaveNoOverflowAndNoFallbackFonts = false;
#if ENABLE(LAYOUT_FORMATTING_CONTEXT)
if (auto* container = LayoutIntegration::LineLayout::blockContainer(*this))
container->invalidateLineLayoutPath();
#endif
if (AXObjectCache* cache = document().existingAXObjectCache())
cache->deferTextChangedIfNeeded(textNode());
}
String RenderText::textWithoutConvertingBackslashToYenSymbol() const
{
if (!m_useBackslashAsYenSymbol || style().textSecurity() != TextSecurity::None)
return text();
if (style().textTransform() == TextTransform::None)
return originalText();
return applyTextTransform(style(), originalText(), previousCharacter());
}
void RenderText::dirtyLineBoxes(bool fullLayout)
{
if (fullLayout)
deleteLineBoxes();
else if (!m_linesDirty)
m_lineBoxes.dirtyAll();
m_linesDirty = false;
}
void RenderText::deleteLineBoxes()
{
m_lineBoxes.deleteAll();
}
std::unique_ptr<LegacyInlineTextBox> RenderText::createTextBox()
{
return makeUnique<LegacyInlineTextBox>(*this);
}
void RenderText::positionLineBox(LegacyInlineTextBox& textBox)
{
if (!textBox.hasTextContent())
return;
m_needsVisualReordering |= !textBox.isLeftToRightDirection();
}
bool RenderText::usesLegacyLineLayoutPath() const
{
#if ENABLE(LAYOUT_FORMATTING_CONTEXT)
return !LayoutIntegration::LineLayout::containing(*this);
#else
return true;
#endif
}
float RenderText::width(unsigned from, unsigned len, float xPos, bool firstLine, HashSet<const Font*>* fallbackFonts, GlyphOverflow* glyphOverflow) const
{
if (from >= text().length())
return 0;
if (from + len > text().length())
len = text().length() - from;
const RenderStyle& lineStyle = firstLine ? firstLineStyle() : style();
return width(from, len, lineStyle.fontCascade(), xPos, fallbackFonts, glyphOverflow);
}
float RenderText::width(unsigned from, unsigned length, const FontCascade& fontCascade, float xPos, HashSet<const Font*>* fallbackFonts, GlyphOverflow* glyphOverflow) const
{
ASSERT(from + length <= text().length());
if (!text().length() || !length)
return 0.f;
auto& style = this->style();
if (auto width = combineTextWidth(*this, fontCascade, style))
return *width;
if (length == 1 && (characterAt(from) == space))
return canUseSimplifiedTextMeasuring() ? fontCascade.primaryFont().spaceWidth() : fontCascade.widthOfSpaceString();
float width = 0.f;
if (&fontCascade == &style.fontCascade()) {
if (!style.preserveNewline() && !from && length == text().length() && (!glyphOverflow || !glyphOverflow->computeBounds)) {
if (fallbackFonts) {
ASSERT(glyphOverflow);
if (preferredLogicalWidthsDirty() || !m_knownToHaveNoOverflowAndNoFallbackFonts) {
const_cast<RenderText*>(this)->computePreferredLogicalWidths(0, *fallbackFonts, *glyphOverflow);
if (fallbackFonts->isEmpty() && !glyphOverflow->left && !glyphOverflow->right && !glyphOverflow->top && !glyphOverflow->bottom)
m_knownToHaveNoOverflowAndNoFallbackFonts = true;
}
width = m_maxWidth;
} else
width = maxLogicalWidth();
} else
width = widthFromCache(fontCascade, from, length, xPos, fallbackFonts, glyphOverflow, style);
} else {
TextRun run = RenderBlock::constructTextRun(*this, from, length, style);
run.setCharacterScanForCodePath(!canUseSimpleFontCodePath());
run.setTabSize(!style.collapseWhiteSpace(), style.tabSize());
run.setXPos(xPos);
width = fontCascade.width(run, fallbackFonts, glyphOverflow);
}
return clampTo(width, 0.f);
}
IntRect RenderText::linesBoundingBox() const
{
auto firstTextBox = InlineIterator::firstTextBoxFor(*this);
if (!firstTextBox)
return { };
auto boundingBox = firstTextBox->visualRectIgnoringBlockDirection();
for (auto textBox = firstTextBox; ++textBox;)
boundingBox.uniteEvenIfEmpty(textBox->visualRectIgnoringBlockDirection());
return enclosingIntRect(boundingBox);
}
LayoutRect RenderText::clippedOverflowRect(const RenderLayerModelObject* repaintContainer, VisibleRectContext context) const
{
RenderObject* rendererToRepaint = containingBlock();
// Do not cross self-painting layer boundaries.
RenderObject& enclosingLayerRenderer = enclosingLayer()->renderer();
if (&enclosingLayerRenderer != rendererToRepaint && !rendererToRepaint->isDescendantOf(&enclosingLayerRenderer))
rendererToRepaint = &enclosingLayerRenderer;
// The renderer we chose to repaint may be an ancestor of repaintContainer, but we need to do a repaintContainer-relative repaint.
if (repaintContainer && repaintContainer != rendererToRepaint && !rendererToRepaint->isDescendantOf(repaintContainer))
return repaintContainer->clippedOverflowRect(repaintContainer, context);
return rendererToRepaint->clippedOverflowRect(repaintContainer, context);
}
LayoutRect RenderText::collectSelectionGeometriesForLineBoxes(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent, Vector<FloatQuad>* quads)
{
ASSERT(!needsLayout());
if (selectionState() == HighlightState::None)
return LayoutRect();
if (!containingBlock())
return LayoutRect();
// Now calculate startPos and endPos for painting selection.
// We include a selection while endPos > 0
unsigned startOffset;
unsigned endOffset;
if (selectionState() == HighlightState::Inside) {
// We are fully selected.
startOffset = 0;
endOffset = text().length();
} else {
startOffset = view().selection().startOffset();
endOffset = view().selection().endOffset();
if (selectionState() == HighlightState::Start)
endOffset = text().length();
else if (selectionState() == HighlightState::End)
startOffset = 0;
}
if (startOffset == endOffset)
return IntRect();
LayoutRect resultRect;
for (auto& run : InlineIterator::textBoxesFor(*this)) {
LayoutRect rect;
rect.unite(run.selectionRect(startOffset, endOffset));
rect.unite(ellipsisRectForTextRun(run, startOffset, endOffset));
if (rect.isEmpty())
continue;
resultRect.unite(rect);
if (quads)
quads->append(localToContainerQuad(FloatRect(rect), repaintContainer));
}
if (clipToVisibleContent)
return computeRectForRepaint(resultRect, repaintContainer);
return localToContainerQuad(FloatRect(resultRect), repaintContainer).enclosingBoundingBox();
}
LayoutRect RenderText::collectSelectionGeometriesForLineBoxes(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent, Vector<FloatQuad>& quads)
{
return collectSelectionGeometriesForLineBoxes(repaintContainer, clipToVisibleContent, &quads);
}
LayoutRect RenderText::selectionRectForRepaint(const RenderLayerModelObject* repaintContainer, bool clipToVisibleContent)
{
return collectSelectionGeometriesForLineBoxes(repaintContainer, clipToVisibleContent, nullptr);
}
int RenderText::caretMinOffset() const
{
auto first = InlineIterator::firstTextBoxFor(*this);
if (!first)
return 0;
int minOffset = first->start();
for (auto box = first; ++box;)
minOffset = std::min<int>(minOffset, box->start());
return minOffset;
}
int RenderText::caretMaxOffset() const
{
auto first = InlineIterator::firstTextBoxFor(*this);
if (!first)
return text().length();
int maxOffset = first->end();
for (auto box = first; ++box;)
maxOffset = std::max<int>(maxOffset, box->end());
return maxOffset;
}
unsigned RenderText::countRenderedCharacterOffsetsUntil(unsigned offset) const
{
unsigned result = 0;
for (auto& run : InlineIterator::textBoxesFor(*this)) {
auto start = run.start();
auto length = run.length();
if (offset < start)
return result;
if (offset <= start + length) {
result += offset - start;
return result;
}
result += length;
}
return result;
}
enum class OffsetType { Character, Caret };
static bool containsOffset(const RenderText& text, unsigned offset, OffsetType type)
{
for (auto [box, orderCache] = InlineIterator::firstTextBoxInLogicalOrderFor(text); box; box = InlineIterator::nextTextBoxInLogicalOrder(box, orderCache)) {
auto start = box->start();
if (offset < start)
return false;
unsigned end = box->end();
if (offset >= start && offset <= end) {
if (offset == end && (type == OffsetType::Character || box->isLineBreak()))
continue;
if (type == OffsetType::Character)
return true;
// Return false for offsets inside composed characters.
return !offset || offset == static_cast<unsigned>(text.nextOffset(text.previousOffset(offset)));
}
}
return false;
}
bool RenderText::containsRenderedCharacterOffset(unsigned offset) const
{
return containsOffset(*this, offset, OffsetType::Character);
}
bool RenderText::containsCaretOffset(unsigned offset) const
{
return containsOffset(*this, offset, OffsetType::Caret);
}
bool RenderText::hasRenderedText() const
{
for (auto& box : InlineIterator::textBoxesFor(*this)) {
if (box.length())
return true;
}
return false;
}
int RenderText::previousOffset(int current) const
{
if (m_isAllASCII || text().is8Bit())
return current - 1;
CachedTextBreakIterator iterator(text(), TextBreakIterator::Mode::Caret, nullAtom());
return iterator.preceding(current).value_or(current - 1);
}
int RenderText::previousOffsetForBackwardDeletion(int current) const
{
CachedTextBreakIterator iterator(text(), TextBreakIterator::Mode::Delete, nullAtom());
return iterator.preceding(current).value_or(0);
}
int RenderText::nextOffset(int current) const
{
if (m_isAllASCII || text().is8Bit())
return current + 1;
CachedTextBreakIterator iterator(text(), TextBreakIterator::Mode::Caret, nullAtom());
return iterator.following(current).value_or(current + 1);
}
bool RenderText::computeCanUseSimpleFontCodePath() const
{
if (m_isAllASCII || text().is8Bit())
return true;
return FontCascade::characterRangeCodePath(text().characters16(), length()) == FontCascade::CodePath::Simple;
}
void RenderText::momentarilyRevealLastTypedCharacter(unsigned offsetAfterLastTypedCharacter)
{
if (style().textSecurity() == TextSecurity::None)
return;
auto& secureTextTimer = secureTextTimers().add(this, nullptr).iterator->value;
if (!secureTextTimer)
secureTextTimer = makeUnique<SecureTextTimer>(*this);
secureTextTimer->restart(offsetAfterLastTypedCharacter);
}
StringView RenderText::stringView(unsigned start, std::optional<unsigned> stop) const
{
unsigned destination = stop.value_or(text().length());
ASSERT(start <= length());
ASSERT(destination <= length());
ASSERT(start <= destination);
if (text().is8Bit())
return { text().characters8() + start, destination - start };
return { text().characters16() + start, destination - start };
}
RenderInline* RenderText::inlineWrapperForDisplayContents()
{
ASSERT(m_hasInlineWrapperForDisplayContents == inlineWrapperForDisplayContentsMap().contains(this));
if (!m_hasInlineWrapperForDisplayContents)
return nullptr;
return inlineWrapperForDisplayContentsMap().get(this).get();
}
void RenderText::setInlineWrapperForDisplayContents(RenderInline* wrapper)
{
ASSERT(m_hasInlineWrapperForDisplayContents == inlineWrapperForDisplayContentsMap().contains(this));
if (!wrapper) {
if (!m_hasInlineWrapperForDisplayContents)
return;
inlineWrapperForDisplayContentsMap().remove(this);
m_hasInlineWrapperForDisplayContents = false;
return;
}
inlineWrapperForDisplayContentsMap().add(this, wrapper);
m_hasInlineWrapperForDisplayContents = true;
}
} // namespace WebCore