single_expression.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_EXPRESSIONSINGLE_EXPRESSION_H
#define BRACKET_EXPRESSIONSINGLE_EXPRESSION_H

namespace bracket_expression {

template<typename E>
class single_expression
{
typedef typename grammar_to_parser::basic_parser<E>::parser_list parser_list;
        
        grammar_to_parser::basic_choice<E,collating_choice<E> >         
                                                                                                        m_collating_choice;
        grammar_to_parser::basic_non_terminal<E,character_class<E> >    
                                                                                                        m_character_class;
        grammar_to_parser::basic_choice<E,equivalence_class<E> >
                                                                                                        m_equivalence_class;
        
public:
        unsigned long recognize( const E* buf, const unsigned long buf_length )
        {
                int ret = 0;
                int size = 0;
                if( m_collating_choice.is_parsed() )
                {
                        ret = m_collating_choice->compare(buf,buf_length);
                        size = m_collating_choice->matched_size();
                }
                else if( m_character_class.is_parsed() )
                {
                        ret = m_character_class->compare(buf,buf_length);
                        size = m_character_class->matched_size();
                }
                else
                {
                        ret = m_equivalence_class->compare(buf,buf_length);
                        size = m_equivalence_class->matched_size();
                }
                if( ret == 0 )
                        return size;
                else
                        return 0;
        }
public:
    single_expression() {};

    ~single_expression() {};
        void push_parsers( parser_list &l )
        {
                l.push_back( &m_equivalence_class );
                l.push_back( &m_character_class );
                l.push_back( &m_collating_choice );
        }       

};

};

#endif

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