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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.
*/
#pragma once
#include "LineInfo.h"
#include "RenderBoxInlines.h"
#include "RenderBoxModelObjectInlines.h"
#include "RenderLayer.h"
#include "RenderObjectInlines.h"
namespace WebCore {
enum WhitespacePosition : bool { LeadingWhitespace, TrailingWhitespace };
inline const RenderStyle& lineStyle(const RenderObject& renderer, const LineInfo& lineInfo)
{
return lineInfo.isFirstLine() ? renderer.firstLineStyle() : renderer.style();
}
inline bool requiresLineBoxForContent(const RenderInline& flow, const LineInfo& lineInfo)
{
RenderElement* parent = flow.parent();
if (flow.document().inNoQuirksMode()) {
const RenderStyle& flowStyle = lineStyle(flow, lineInfo);
const RenderStyle& parentStyle = lineStyle(*parent, lineInfo);
if (flowStyle.lineHeight() != parentStyle.lineHeight()
|| flowStyle.verticalAlign() != parentStyle.verticalAlign()
|| !parentStyle.fontCascade().metricsOfPrimaryFont().hasIdenticalAscentDescentAndLineGap(flowStyle.fontCascade().metricsOfPrimaryFont()))
return true;
}
return false;
}
inline bool shouldCollapseWhiteSpace(const RenderStyle* style, const LineInfo& lineInfo, WhitespacePosition whitespacePosition)
{
// CSS2 16.6.1
// If a space (U+0020) at the beginning of a line has 'white-space' set to 'normal', 'nowrap', or 'pre-line', it is removed.
// If a space (U+0020) at the end of a line has 'white-space' set to 'normal', 'nowrap', or 'pre-line', it is also removed.
// If spaces (U+0020) or tabs (U+0009) at the end of a line have 'white-space' set to 'pre-wrap', UAs may visually collapse them.
return style->collapseWhiteSpace()
|| (whitespacePosition == TrailingWhitespace && style->whiteSpaceCollapse() == WhiteSpaceCollapse::Preserve
&& style->textWrapMode() == TextWrapMode::Wrap && !lineInfo.isEmpty());
}
inline bool skipNonBreakingSpace(const LegacyInlineIterator& it, const LineInfo& lineInfo)
{
if (it.renderer()->style().nbspMode() != NBSPMode::Space || it.current() != noBreakSpace)
return false;
// FIXME: This is bad. It makes nbsp inconsistent with space and won't work correctly
// with m_minWidth/m_maxWidth.
// Do not skip a non-breaking space if it is the first character
// on a line after a clean line break (or on the first line, since previousLineBrokeCleanly starts off
// |true|).
if (lineInfo.isEmpty())
return false;
return true;
}
inline bool requiresLineBox(const LegacyInlineIterator& it, const LineInfo& lineInfo = LineInfo(), WhitespacePosition whitespacePosition = LeadingWhitespace)
{
bool rendererIsEmptyInline = false;
if (auto* inlineRenderer = dynamicDowncast<RenderInline>(*it.renderer())) {
if (!requiresLineBoxForContent(*inlineRenderer, lineInfo))
return false;
rendererIsEmptyInline = isEmptyInline(*inlineRenderer);
}
if (!shouldCollapseWhiteSpace(&it.renderer()->style(), lineInfo, whitespacePosition))
return true;
UChar current = it.current();
bool notJustWhitespace = current != ' ' && current != '\t' && current != softHyphen && (current != '\n' || it.renderer()->preservesNewline()) && !skipNonBreakingSpace(it, lineInfo);
return notJustWhitespace || rendererIsEmptyInline;
}
} // namespace WebCore
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