third_party/WebKit/Source/core/layout/line/BreakingContext.cpp

   1 /*
   2  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
   3  * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
   4  * Copyright (C) 2010 Google Inc. All rights reserved.
   5  * Copyright (C) 2013 Adobe Systems Incorporated.
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Library General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Library General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Library General Public License
  18  * along with this library; see the file COPYING.LIB.  If not, write to
  19  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20  * Boston, MA 02110-1301, USA.
  21  *
  22  */
  23
  24 #include "config.h"
  25 #include "core/layout/line/BreakingContextInlineHeaders.h"
  26
  27 namespace blink {
  28
  29 InlineIterator BreakingContext::handleEndOfLine()
  30 {
  31     if (m_lineBreak == m_resolver.position() && (!m_lineBreak.object() || !m_lineBreak.object().isBR())) {
  32         // we just add as much as possible
  33         if (m_blockStyle->whiteSpace() == PRE && !m_current.offset()) {
  34             m_lineBreak.moveTo(m_lastObject, m_lastObject.isText() ? m_lastObject.length() : 0);
  35         } else if (m_lineBreak.object()) {
  36             // Don't ever break in the middle of a word if we can help it.
  37             // There's no room at all. We just have to be on this line,
  38             // even though we'll spill out.
  39             m_lineBreak.moveTo(m_current.object(), m_current.offset());
  40         }
  41     }
  42
  43     // FIXME Bug 100049: We do not need to consume input in a multi-segment line
  44     // unless no segment will.
  45     if (m_lineBreak == m_resolver.position())
  46         m_lineBreak.increment();
  47
  48     // Sanity check our midpoints.
  49     m_lineMidpointState.checkMidpoints(m_lineBreak);
  50
  51     m_trailingObjects.updateMidpointsForTrailingObjects(m_lineMidpointState, m_lineBreak, TrailingObjects::CollapseFirstSpace);
  52
  53     // We might have made lineBreak an iterator that points past the end
  54     // of the object. Do this adjustment to make it point to the start
  55     // of the next object instead to avoid confusing the rest of the
  56     // code.
  57     if (m_lineBreak.offset()) {
  58         // This loop enforces the invariant that line breaks should never point
  59         // at an empty inline. See http://crbug.com/305904.
  60         do {
  61             m_lineBreak.setOffset(m_lineBreak.offset() - 1);
  62             m_lineBreak.increment();
  63         } while (!m_lineBreak.atEnd() && isEmptyInline(m_lineBreak.object()));
  64     }
  65
  66     return m_lineBreak;
  67 }
  68
  69 }