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/*
* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
* Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
* Copyright (C) 2010 Google Inc. All rights reserved.
* Copyright (C) 2013 ChangSeok Oh <shivamidow@gmail.com>
* Copyright (C) 2013 Adobe Systems Inc. All right reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include "config.h"
#include "LineBreaker.h"
#include "BreakingContextInlineHeaders.h"
#include "RenderCombineText.h"
#include "ShapeInsideInfo.h"
namespace WebCore {
void LineBreaker::reset()
{
m_positionedObjects.clear();
m_hyphenated = false;
m_clear = CNONE;
}
// FIXME: The entire concept of the skipTrailingWhitespace function is flawed, since we really need to be building
// line boxes even for containers that may ultimately collapse away. Otherwise we'll never get positioned
// elements quite right. In other words, we need to build this function's work into the normal line
// object iteration process.
// NB. this function will insert any floating elements that would otherwise
// be skipped but it will not position them.
void LineBreaker::skipTrailingWhitespace(InlineIterator& iterator, const LineInfo& lineInfo)
{
while (!iterator.atEnd() && !requiresLineBox(iterator, lineInfo, TrailingWhitespace)) {
RenderObject& object = *iterator.renderer();
if (object.isOutOfFlowPositioned())
setStaticPositions(m_block, toRenderBox(object));
else if (object.isFloating())
m_block.insertFloatingObject(toRenderBox(object));
iterator.increment();
}
}
void LineBreaker::skipLeadingWhitespace(InlineBidiResolver& resolver, LineInfo& lineInfo, FloatingObject* lastFloatFromPreviousLine, LineWidth& width)
{
while (!resolver.position().atEnd() && !requiresLineBox(resolver.position(), lineInfo, LeadingWhitespace)) {
RenderObject& object = *resolver.position().renderer();
if (object.isOutOfFlowPositioned()) {
setStaticPositions(m_block, toRenderBox(object));
if (object.style().isOriginalDisplayInlineType()) {
resolver.runs().addRun(new BidiRun(0, 1, object, resolver.context(), resolver.dir()));
lineInfo.incrementRunsFromLeadingWhitespace();
}
} else if (object.isFloating())
m_block.positionNewFloatOnLine(m_block.insertFloatingObject(toRenderBox(object)), lastFloatFromPreviousLine, lineInfo, width);
else if (object.isText() && object.style().hasTextCombine() && object.isCombineText() && !toRenderCombineText(object).isCombined()) {
toRenderCombineText(object).combineText();
if (toRenderCombineText(object).isCombined())
continue;
}
resolver.increment();
}
resolver.commitExplicitEmbedding();
}
InlineIterator LineBreaker::nextLineBreak(InlineBidiResolver& resolver, LineInfo& lineInfo, RenderTextInfo& renderTextInfo, FloatingObject* lastFloatFromPreviousLine, unsigned consecutiveHyphenatedLines, WordMeasurements& wordMeasurements)
{
#if !ENABLE(CSS_SHAPES)
return nextSegmentBreak(resolver, lineInfo, renderTextInfo, lastFloatFromPreviousLine, consecutiveHyphenatedLines, wordMeasurements);
#else
ShapeInsideInfo* shapeInsideInfo = m_block.layoutShapeInsideInfo();
if (!shapeInsideInfo || !shapeInsideInfo->lineOverlapsShapeBounds())
return nextSegmentBreak(resolver, lineInfo, renderTextInfo, lastFloatFromPreviousLine, consecutiveHyphenatedLines, wordMeasurements);
InlineIterator end = resolver.position();
InlineIterator oldEnd = end;
if (!shapeInsideInfo->hasSegments()) {
end = nextSegmentBreak(resolver, lineInfo, renderTextInfo, lastFloatFromPreviousLine, consecutiveHyphenatedLines, wordMeasurements);
resolver.setPositionIgnoringNestedIsolates(oldEnd);
return oldEnd;
}
const SegmentList& segments = shapeInsideInfo->segments();
SegmentRangeList& segmentRanges = shapeInsideInfo->segmentRanges();
for (unsigned i = 0; i < segments.size() && !end.atEnd(); i++) {
InlineIterator segmentStart = resolver.position();
end = nextSegmentBreak(resolver, lineInfo, renderTextInfo, lastFloatFromPreviousLine, consecutiveHyphenatedLines, wordMeasurements);
ASSERT(segmentRanges.size() == i);
if (resolver.position().atEnd()) {
segmentRanges.append(LineSegmentRange(segmentStart, end));
break;
}
if (resolver.position() == end) {
// Nothing fit this segment
end = segmentStart;
segmentRanges.append(LineSegmentRange(segmentStart, segmentStart));
resolver.setPositionIgnoringNestedIsolates(segmentStart);
} else {
// Note that resolver.position is already skipping some of the white space at the beginning of the line,
// so that's why segmentStart might be different than resolver.position().
LineSegmentRange range(resolver.position(), end);
segmentRanges.append(range);
resolver.setPosition(end, numberOfIsolateAncestors(end));
if (lineInfo.previousLineBrokeCleanly()) {
// If we hit a new line break, just stop adding anything to this line.
break;
}
}
}
resolver.setPositionIgnoringNestedIsolates(oldEnd);
return end;
#endif
}
InlineIterator LineBreaker::nextSegmentBreak(InlineBidiResolver& resolver, LineInfo& lineInfo, RenderTextInfo& renderTextInfo, FloatingObject* lastFloatFromPreviousLine, unsigned consecutiveHyphenatedLines, WordMeasurements& wordMeasurements)
{
reset();
ASSERT(resolver.position().root() == &m_block);
bool appliedStartWidth = resolver.position().offset();
LineWidth width(m_block, lineInfo.isFirstLine(), requiresIndent(lineInfo.isFirstLine(), lineInfo.previousLineBrokeCleanly(), m_block.style()));
skipLeadingWhitespace(resolver, lineInfo, lastFloatFromPreviousLine, width);
if (resolver.position().atEnd())
return resolver.position();
BreakingContext context(*this, resolver, lineInfo, width, renderTextInfo, lastFloatFromPreviousLine, appliedStartWidth, m_block);
while (context.currentObject()) {
context.initializeForCurrentObject();
if (context.currentObject()->isBR()) {
context.handleBR(m_clear);
} else if (context.currentObject()->isOutOfFlowPositioned()) {
context.handleOutOfFlowPositioned(m_positionedObjects);
} else if (context.currentObject()->isFloating()) {
context.handleFloat();
} else if (context.currentObject()->isRenderInline()) {
context.handleEmptyInline();
} else if (context.currentObject()->isReplaced()) {
context.handleReplaced();
} else if (context.currentObject()->isText()) {
if (context.handleText(wordMeasurements, m_hyphenated, consecutiveHyphenatedLines)) {
// We've hit a hard text line break. Our line break iterator is updated, so go ahead and early return.
return context.lineBreak();
}
} else if (context.currentObject()->isLineBreakOpportunity())
context.commitLineBreakAtCurrentWidth(context.currentObject());
else
ASSERT_NOT_REACHED();
if (context.atEnd())
return context.handleEndOfLine();
context.commitAndUpdateLineBreakIfNeeded();
if (context.atEnd())
return context.handleEndOfLine();
context.increment();
}
context.clearLineBreakIfFitsOnLine(true);
return context.handleEndOfLine();
}
}
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