1 /*
2 * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
3 * Copyright (C) 2003, 2004, 2006, 2007, 2009 Apple Inc. All right reserved.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB. If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 *
20 */
21
22 #include "config.h"
23 #include "BidiContext.h"
24
25 #include <wtf/StdLibExtras.h>
26
27 namespace WebCore {
28
29 using namespace WTF::Unicode;
30
create(unsigned char level,Direction direction,bool override,BidiContext * parent)31 PassRefPtr<BidiContext> BidiContext::create(unsigned char level, Direction direction, bool override, BidiContext* parent)
32 {
33 ASSERT(direction == (level % 2 ? RightToLeft : LeftToRight));
34
35 if (parent)
36 return adoptRef(new BidiContext(level, direction, override, parent));
37
38 ASSERT(level <= 1);
39 if (!level) {
40 DEFINE_STATIC_LOCAL(BidiContext, ltrContext, (0, LeftToRight, false, 0));
41 if (!override)
42 return <rContext;
43
44 DEFINE_STATIC_LOCAL(BidiContext, ltrOverrideContext, (0, LeftToRight, true, 0));
45 return <rOverrideContext;
46 }
47
48 DEFINE_STATIC_LOCAL(BidiContext, rtlContext, (1, RightToLeft, false, 0));
49 if (!override)
50 return &rtlContext;
51
52 DEFINE_STATIC_LOCAL(BidiContext, rtlOverrideContext, (1, RightToLeft, true, 0));
53 return &rtlOverrideContext;
54 }
55
operator ==(const BidiContext & c1,const BidiContext & c2)56 bool operator==(const BidiContext& c1, const BidiContext& c2)
57 {
58 if (&c1 == &c2)
59 return true;
60 if (c1.level() != c2.level() || c1.override() != c2.override() || c1.dir() != c2.dir())
61 return false;
62 if (!c1.parent())
63 return !c2.parent();
64 return c2.parent() && *c1.parent() == *c2.parent();
65 }
66
67 } // namespace WebCore
68