unicode_conversions.hpp

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#ifndef LIBJMMCG_CORE_UNICODE_CONVERSIONS_HPP
#define LIBJMMCG_CORE_UNICODE_CONVERSIONS_HPP
 
/******************************************************************************
** Copyright © 2002 by J.M.McGuiness, coder@hussar.me.uk
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License as published by the Free Software Foundation; either
** version 2.1 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
// DESCRIPTION:
// Utilities to convert from Unicode to ASCII and back. Also functions that
// do the conversion or nothing, depending upon the definition of "_UNICODE".
 
#include "ttypes.hpp"
 
#include <locale>
#include <memory>
 
namespace jmmcg { namespace LIBJMMCG_VER_NAMESPACE {
 
   struct widen : public std::unary_function<char,wchar_t> {
      widen()
      : ct(std::use_facet<std::ctype<wchar_t> >(std::locale())) {
      }
      wchar_t operator()(char c) const {
         return ct.widen(c);
      }
 
   private:
      std::ctype<wchar_t> const & ct;
   };
 
   struct narrow : public std::unary_function<wchar_t,char> {
      narrow()
      : ct(std::use_facet<std::ctype<wchar_t> >(std::locale())) {
      }
      char operator()(wchar_t c) const {
         return ct.narrow(c,' ');
      }
 
   private:
      std::ctype<wchar_t> const & ct;
   };
 
   inline std::wstring __fastcall
   StringToWString(const std::string &in) {
      std::wstring ret(in.size(), std::wstring::value_type(0));
      // M$ Broke the declaration of "std::use_facet()" by adding extra, non-default arguments...
      // So we have to hack around it...
#if defined(_MSC_VER) && (_MSC_VER < 1300)
      std::ctype<wchar_t>().widen(in.data(),in.data()+in.size(),&(*ret.begin()));
#else
      std::transform(in.begin(),in.end(),ret.begin(),widen());
#endif   // _MSC_VER
      return ret;
   }
 
   inline std::string __fastcall
   WStringToString(
      const std::wstring &in
#if defined(_MSC_VER) && (_MSC_VER < 1300)
      ,const char dflt='@'
#endif   // _MSC_VER
   ) {
      std::string ret(in.size(), std::string::value_type(0));
      // M$ Broke the declaration of "std::use_facet()" by adding extra, non-default arguments...
      // So we have to hack around it...
#if defined(_MSC_VER) && (_MSC_VER < 1300)
      std::ctype<wchar_t>().narrow(in.data(),in.data()+in.size(),dflt,&(*ret.begin()));
#else
      std::transform(in.begin(),in.end(),ret.begin(),narrow());
#endif   // _MSC_VER
      return ret;
   }
 
   inline tstring __fastcall
   WStringToTString(const std::wstring &in)
#ifdef _UNICODE
   noexcept(true) {
      return in;
#else
   {
      return WStringToString(in);
#endif   // _UNICODE
   }
 
   inline std::wstring __fastcall
   TStringToWString(const tstring &in)
#ifdef _UNICODE
   noexcept(true) {
      return in;
#else
   {
      return StringToWString(in);
#endif   // _UNICODE
   }
 
   inline tstring __fastcall
   StringToTString(const std::string &in)
#ifdef _UNICODE
   {
      return StringToWString(in);
#else
   noexcept(true) {
      return in;
#endif   // _UNICODE
   }
 
   inline std::string __fastcall
   TStringToString(const tstring &in)
#ifdef _UNICODE
   {
      return WStringToString(in);
#else
   noexcept(true) {
      return in;
#endif   // _UNICODE
   }
 
} }
 
#ifdef _MSC_VER
 
#pragma warning(default:4284)
 
#endif   // _MSC_VER
 
#endif