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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 "BreakingContext.h"
namespace WebCore {
void LineBreaker::skipTrailingWhitespace(LegacyInlineIterator& iterator, const LineInfo& lineInfo)
{
while (!iterator.atEnd() && !requiresLineBox(iterator, lineInfo, TrailingWhitespace))
iterator.increment();
}
void LineBreaker::skipLeadingWhitespace(InlineBidiResolver& resolver, LineInfo& lineInfo)
{
while (!resolver.position().atEnd() && !requiresLineBox(resolver.position(), lineInfo, LeadingWhitespace))
resolver.increment();
resolver.commitExplicitEmbedding();
}
LegacyInlineIterator LineBreaker::nextLineBreak(InlineBidiResolver& resolver, LineInfo& lineInfo, RenderTextInfo& renderTextInfo)
{
ASSERT(resolver.position().root() == &m_block);
bool appliedStartWidth = resolver.position().offset();
LineWidth width(m_block, lineInfo.isFirstLine());
skipLeadingWhitespace(resolver, lineInfo);
if (resolver.position().atEnd())
return resolver.position();
BreakingContext context(*this, resolver, lineInfo, width, renderTextInfo, appliedStartWidth, m_block);
while (context.currentObject()) {
context.initializeForCurrentObject();
if (context.currentObject()->isRenderInline()) {
context.handleEmptyInline();
} else if (context.currentObject()->isRenderText()) {
if (context.handleText()) {
// We've hit a hard text line break. Our line break iterator is updated, so 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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