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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.
*
* 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 "core/layout/line/LineBreaker.h"
#include "core/layout/line/BreakingContextInlineHeaders.h"
namespace blink {
void LineBreaker::skipLeadingWhitespace(InlineBidiResolver& resolver,
LineInfo& lineInfo,
LineWidth& width) {
while (!resolver.position().atEnd() &&
!requiresLineBox(resolver.position(), lineInfo, LeadingWhitespace)) {
LineLayoutItem lineLayoutItem = resolver.position().getLineLayoutItem();
if (lineLayoutItem.isOutOfFlowPositioned()) {
setStaticPositions(m_block, LineLayoutBox(lineLayoutItem),
width.indentText());
if (lineLayoutItem.style()->isOriginalDisplayInlineType()) {
resolver.runs().addRun(
createRun(0, 1, LineLayoutItem(lineLayoutItem), resolver));
lineInfo.incrementRunsFromLeadingWhitespace();
}
} else if (lineLayoutItem.isFloating()) {
m_block.insertFloatingObject(LineLayoutBox(lineLayoutItem));
m_block.placeNewFloats(m_block.logicalHeight(), &width);
}
resolver.position().increment(&resolver);
}
resolver.commitExplicitEmbedding(resolver.runs());
}
void LineBreaker::reset() {
m_positionedObjects.clear();
m_hyphenated = false;
m_clear = ClearNone;
}
InlineIterator LineBreaker::nextLineBreak(InlineBidiResolver& resolver,
LineInfo& lineInfo,
LayoutTextInfo& layoutTextInfo,
WordMeasurements& wordMeasurements) {
reset();
ASSERT(resolver.position().root() == m_block);
bool appliedStartWidth = resolver.position().offset() > 0;
LineWidth width(
m_block, lineInfo.isFirstLine(),
requiresIndent(lineInfo.isFirstLine(),
lineInfo.previousLineBrokeCleanly(), m_block.styleRef()));
skipLeadingWhitespace(resolver, lineInfo, width);
if (resolver.position().atEnd())
return resolver.position();
BreakingContext context(resolver, lineInfo, width, layoutTextInfo,
appliedStartWidth, m_block);
while (context.currentItem()) {
context.initializeForCurrentObject();
if (context.currentItem().isBR()) {
context.handleBR(m_clear);
} else if (context.currentItem().isOutOfFlowPositioned()) {
context.handleOutOfFlowPositioned(m_positionedObjects);
} else if (context.currentItem().isFloating()) {
context.handleFloat();
} else if (context.currentItem().isLayoutInline()) {
context.handleEmptyInline();
} else if (context.currentItem().isAtomicInlineLevel()) {
context.handleReplaced();
} else if (context.currentItem().isText()) {
if (context.handleText(wordMeasurements, m_hyphenated)) {
// We've hit a hard text line break. Our line break iterator is updated,
// so go ahead and early return.
return context.lineBreak();
}
} else {
ASSERT_NOT_REACHED();
}
if (context.atEnd())
return context.handleEndOfLine();
context.commitAndUpdateLineBreakIfNeeded();
if (context.atEnd())
return context.handleEndOfLine();
context.increment();
}
context.clearLineBreakIfFitsOnLine();
return context.handleEndOfLine();
}
} // namespace blink
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