meta_char_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_EXPRESSIONMETA_CHAR_CHOICE_H
#define BRACKET_EXPRESSIONMETA_CHAR_CHOICE_H

namespace bracket_expression {

template<typename E>
class meta_char_choice
{
typedef typename grammar_to_parser::basic_parser<E>::parser_list parser_list;

        grammar_to_parser::basic_terminal<E,'^'>                        m_circumflex;
        grammar_to_parser::basic_terminal<E,'-'>                        m_hyphen;
        grammar_to_parser::basic_terminal<E,']'>                        m_right_bracket;
        
public:
    meta_char_choice() {};

    ~meta_char_choice() {};
        void push_parsers( parser_list &l )
        {
                l.push_back( &m_circumflex );
                l.push_back( &m_hyphen );
                l.push_back( &m_right_bracket );
        }       
        int compare( const E* buf, const unsigned long buf_length )
        {
                if( m_hyphen.is_parsed() )
                {
                        if( std::use_facet< std::collate<E> >(std::locale()).compare(
                                                                                                buf,
                                                                                                buf+1,
                                                                                                m_hyphen.get(),
                                                                                                m_hyphen.get()+1 ) == 0 )
                        {
                                return 1;
                        }
                        else
                        {
                                return 0;
                        }
                }
                else if( m_right_bracket.is_parsed() )
                {
                        if( std::use_facet< std::collate<E> >(std::locale()).compare(
                                                                                                buf,
                                                                                                buf+1,
                                                                                                m_right_bracket.get(),
                                                                                                m_right_bracket.get()+1) == 0 )
                        {
                                return 1;
                        }
                        else
                        {
                                return 0;
                        }
                }
                else
                {
                        if( std::use_facet< std::collate<E> >(std::locale()).compare(
                                                                                                buf,
                                                                                                buf+1,
                                                                                                m_circumflex.get(),
                                                                                                m_circumflex.get()+1) == 0 )
                        {
                                return 1;
                        }
                        else
                        {
                                return 0;
                        }
                }
        }
};

};

#endif

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