util.hpp

//
//  Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
//
//  Distributed under the Boost Software License, Version 1.0. (See
//  accompanying file LICENSE_1_0.txt or copy at
//  http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef BOOST_LOCALE_UTIL_HPP
#define BOOST_LOCALE_UTIL_HPP
#include <locale>
#include <typeinfo>
#include <boost/cstdint.hpp>
#include <boost/locale/utf.hpp>
#include <boost/locale/generator.hpp>
#include <boost/assert.hpp>

#include <vector>
namespace boost {
namespace locale {
namespace util {
    
    BOOST_LOCALE_DECL
    std::string get_system_locale(bool use_utf8_on_windows = false);

    BOOST_LOCALE_DECL
    std::locale create_info(std::locale const &in,std::string const &name); 


    class base_converter {
    public:

        static const uint32_t illegal=utf::illegal;

        static const uint32_t incomplete=utf::incomplete;
        
        virtual ~base_converter() 
        {
        }
        virtual int max_len() const 
        {
            return 1;
        }
        virtual bool is_thread_safe() const 
        {
            return false;
        }
        virtual base_converter *clone() const 
        {
            BOOST_ASSERT(typeid(*this)==typeid(base_converter));
            return new base_converter();
        }

        virtual uint32_t to_unicode(char const *&begin,char const *end) 
        {
            if(begin == end)
                return incomplete;
            unsigned char cp = *begin;
            if(cp <= 0x7F) {
                begin++;
                return cp;
            }
            return illegal;
        }

        virtual uint32_t from_unicode(uint32_t u,char *begin,char const *end) 
        {
            if(begin==end)
                return incomplete;
            if(u >= 0x80)
                return illegal;
            *begin = static_cast<char>(u);
            return 1;
        }
    };

    BOOST_LOCALE_DECL std::auto_ptr<base_converter> create_utf8_converter();
    BOOST_LOCALE_DECL std::auto_ptr<base_converter> create_simple_converter(std::string const &encoding);


    BOOST_LOCALE_DECL
    std::locale create_codecvt(std::locale const &in,std::auto_ptr<base_converter> cvt,character_facet_type type);

    BOOST_LOCALE_DECL
    std::locale create_utf8_codecvt(std::locale const &in,character_facet_type type);

    BOOST_LOCALE_DECL
    std::locale create_simple_codecvt(std::locale const &in,std::string const &encoding,character_facet_type type);
} // util
} // locale 
} // boost

#endif
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