khtml/misc/translator.h

   1 /**
   2  * This file is part of the KHTML renderer for KDE.
   3  *
   4  * Copyright (C) 2006, 2007 Maksim Orlovich (maksim@kde.org)
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Library General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Library General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Library General Public License
  17  * along with this library; see the file COPYING.LIB.  If not, write to
  18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19  * Boston, MA 02110-1301, USA.
  20  */
  21
  22 #ifndef KHTML_MISC_TRANSLATOR_H
  23 #define KHTML_MISC_TRANSLATOR_H
  24
  25 #include <QtCore/QMap>
  26
  27 //---------------------------------------------------------------------------------------------
  28 /* This class is used to do remapping between different encodings reasonably compactly.
  29    It stores things as (L,R) tables, but reads left-side from memory as MemL */
  30 template<typename L, typename R, typename MemL>
  31 class IDTranslator
  32 {
  33 public:
  34     struct Info {
  35         MemL l;
  36         R    r;
  37     };
  38
  39     IDTranslator(const Info* table) {
  40         for (const Info* cursor = table; cursor->l; ++cursor) {
  41             m_lToR.insert(cursor->l,  cursor->r);
  42             m_rToL.insert(cursor->r,  cursor->l);
  43         }
  44     }
  45
  46     bool hasLeft(L l) {
  47         typename QMap<L,R>::iterator i = m_lToR.find(l);
  48         return i != m_lToR.end();
  49     }
  50
  51     L toLeft(R r) {
  52         typename QMap<R,L>::iterator i( m_rToL.find(r) );
  53         if (i != m_rToL.end())
  54             return *i;
  55         return L();
  56     }
  57
  58     R toRight(L l) {
  59         typename QMap<L,R>::iterator i = m_lToR.find(l);
  60         if (i != m_lToR.end())
  61             return *i;
  62         return R();
  63     }
  64
  65 private:
  66     QMap<L, R> m_lToR;
  67     QMap<R, L> m_rToL;
  68 };
  69
  70 #define MAKE_TRANSLATOR(name,L,R,MR,table) static IDTranslator<L,R,MR>* s_##name; \
  71     static IDTranslator<L,R,MR>* name() { if (!s_##name) s_##name = new IDTranslator<L,R,MR>(table); \
  72         return s_##name; }
  73
  74
  75 #endif