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 ChangSeok Oh <shivamidow@gmail.com>
6 * Copyright (C) 2013 Adobe Systems Inc. All right reserved.
7 *
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * Library General Public License for more details.
17 *
18 * You should have received a copy of the GNU Library General Public License
19 * along with this library; see the file COPYING.LIB.  If not, write to
20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
22 *
23 */
24
25#include "config.h"
26#include "TrailingObjects.h"
27
28#include "InlineIterator.h"
29
30namespace WebCore {
31
32void TrailingObjects::updateMidpointsForTrailingBoxes(LineMidpointState& lineMidpointState, const InlineIterator& lBreak, CollapseFirstSpaceOrNot collapseFirstSpace)
33{
34    if (!m_whitespace)
35        return;
36
37    // This object is either going to be part of the last midpoint, or it is going to be the actual endpoint.
38    // In both cases we just decrease our pos by 1 level to exclude the space, allowing it to - in effect - collapse into the newline.
39    if (lineMidpointState.numMidpoints() % 2) {
40        // Find the trailing space object's midpoint.
41        int trailingSpaceMidpoint = lineMidpointState.numMidpoints() - 1;
42        for ( ; trailingSpaceMidpoint > 0 && lineMidpointState.midpoints()[trailingSpaceMidpoint].renderer() != m_whitespace; --trailingSpaceMidpoint) { }
43        ASSERT(trailingSpaceMidpoint >= 0);
44        if (collapseFirstSpace == CollapseFirstSpace)
45            lineMidpointState.midpoints()[trailingSpaceMidpoint].fastDecrement();
46
47        // Now make sure every single trailingPositionedBox following the trailingSpaceMidpoint properly stops and starts
48        // ignoring spaces.
49        size_t currentMidpoint = trailingSpaceMidpoint + 1;
50        for (size_t i = 0; i < m_boxes.size(); ++i) {
51            if (currentMidpoint >= lineMidpointState.numMidpoints()) {
52                // We don't have a midpoint for this box yet.
53                lineMidpointState.ensureLineBoxInsideIgnoredSpaces(m_boxes[i]);
54            } else {
55                ASSERT(lineMidpointState.midpoints()[currentMidpoint].renderer() == m_boxes[i]);
56                ASSERT(lineMidpointState.midpoints()[currentMidpoint + 1].renderer() == m_boxes[i]);
57            }
58            currentMidpoint += 2;
59        }
60    } else if (!lBreak.renderer()) {
61        ASSERT(m_whitespace->isText());
62        ASSERT(collapseFirstSpace == CollapseFirstSpace);
63        // Add a new end midpoint that stops right at the very end.
64        unsigned length = m_whitespace->textLength();
65        unsigned pos = length >= 2 ? length - 2 : UINT_MAX;
66        InlineIterator endMid(0, m_whitespace, pos);
67        lineMidpointState.startIgnoringSpaces(endMid);
68        for (size_t i = 0; i < m_boxes.size(); ++i)
69            lineMidpointState.ensureLineBoxInsideIgnoredSpaces(m_boxes[i]);
70    }
71}
72
73}
74