collating_choice.h

/***************************************************************************
 *   Copyright (C) 2006 by Radko Mihal                                     *
 *   rmihal@pobox.sk                                                       *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program 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 General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.              *
 ***************************************************************************/
#ifndef BRACKET_EXPRESSIONCOLLATING_CHOICE_H
#define BRACKET_EXPRESSIONCOLLATING_CHOICE_H

namespace bracket_expression {

template<typename E>
class collating_choice
{
typedef typename grammar_to_parser::basic_parser<E>::parser_list parser_list;
typedef std::ctype_base ctypebase;
        
        grammar_to_parser::basic_except_terminal<E,meta_char_choice<E> >        
                                                                                                                                m_non_metas;
        grammar_to_parser::basic_choice<E,collating_symbol<E> >         m_collating_symbol;
        
        unsigned long m_size;
        
public:
    collating_choice() : m_size(0) {};
        ~collating_choice() {};
        
        int matched_size() { return m_size; }
        
        int compare( const E* buf, const unsigned long buf_length )
        {
                int ret = -1;
                m_size = 0;
                if( m_non_metas.is_parsed() )
                {
                        unsigned long to_compare_length = 
                                                collating_symbol<E>::get_symbol_len(buf,buf_length);
                        
                        ret = std::use_facet< std::collate<E> >(std::locale()).compare(
                                                                                                                        buf,
                                                                                                                        buf+to_compare_length,
                                                                                                                        m_non_metas.get(),
                                                                                                                        m_non_metas.get()+1 );
                        m_size = to_compare_length;
                }
                else
                {
                        ret = m_collating_symbol->compare(buf,buf_length); 
                        m_size = m_collating_symbol->matched_size();
                }
                return ret;
        }
        
        
        void push_parsers( parser_list &l )
        {
                l.push_back( &m_collating_symbol );
                l.push_back( &m_non_metas );
        }       

};

};

#endif

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