collator.h

//
//  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 BOOSTER_LOCALE_COLLATOR_H_INCLUDED
#define BOOSTER_LOCALE_COLLATOR_H_INCLUDED

#include <booster/config.h>
#ifdef BOOSTER_MSVC
#  pragma warning(push)
#  pragma warning(disable : 4275 4251 4231 4660)
#endif
#include <locale>


namespace booster {
namespace locale {

    class info;



    class collator_base {
    public:
        typedef enum {
            primary     = 0, 
            secondary   = 1, 
            tertiary    = 2, 
            quaternary  = 3, 
            identical   = 4  
        } level_type;
    };
    
    template<typename CharType>
    class collator : 
        public std::collate<CharType>,
        public collator_base
    {
    public:
        typedef CharType char_type;
        typedef std::basic_string<CharType> string_type;
        

        int compare(level_type level,
                    char_type const *b1,char_type const *e1,
                    char_type const *b2,char_type const *e2) const
        {
            return do_compare(level,b1,e1,b2,e2);
        }
        string_type transform(level_type level,char_type const *b,char_type const *e) const
        {
            return do_transform(level,b,e);
        }

        long hash(level_type level,char_type const *b,char_type const *e) const
        {
            return do_hash(level,b,e);
        }

        int compare(level_type level,string_type const &l,string_type const &r) const
        {
            return do_compare(level,l.data(),l.data()+l.size(),r.data(),r.data()+r.size());
        }


        long hash(level_type level,string_type const &s) const
        {
            return do_hash(level,s.data(),s.data()+s.size());
        }
        string_type transform(level_type level,string_type const &s) const
        {
            return do_transform(level,s.data(),s.data()+s.size());
        }
        
    protected:

        collator(size_t refs = 0) : std::collate<CharType>(refs) 
        {
        }

        virtual ~collator()
        {
        }
        
        virtual int do_compare( char_type const *b1,char_type const *e1,
                                char_type const *b2,char_type const *e2) const
        {
            return do_compare(identical,b1,e1,b2,e2);
        }
        virtual string_type do_transform(char_type const *b,char_type const *e) const
        {
            return do_transform(identical,b,e);
        }
        virtual long do_hash(char_type const *b,char_type const *e) const
        {
            return do_hash(identical,b,e);
        }

        virtual int do_compare( level_type level,
                                char_type const *b1,char_type const *e1,
                                char_type const *b2,char_type const *e2) const = 0;
        virtual string_type do_transform(level_type level,char_type const *b,char_type const *e) const = 0;
        virtual long do_hash(level_type level,char_type const *b,char_type const *e) const = 0;


    };

    template<typename CharType,collator_base::level_type default_level = collator_base::identical>
    struct comparator
    {
    public:
        comparator(std::locale const &l=std::locale(),collator_base::level_type level=default_level) : 
            locale_(l),
            level_(level)
        {
        }

        bool operator()(std::basic_string<CharType> const &left,std::basic_string<CharType> const &right) const
        {
            return std::use_facet<collator<CharType> >(locale_).compare(level_,left,right) < 0;
        }
    private:
        std::locale locale_;
        collator_base::level_type level_;
    };



    } // locale
} // boost

#ifdef BOOSTER_MSVC
#pragma warning(pop)
#endif


#endif
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