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      1 /*
      2  * Copyright (C) 2000 Lars Knoll (knoll (at) 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 
     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 &ltrContext;
     43 
     44         DEFINE_STATIC_LOCAL(BidiContext, ltrOverrideContext, (0, LeftToRight, true, 0));
     45         return &ltrOverrideContext;
     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 
     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