ere_branch.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 EXTENDED_REGULAR_EXPRESSIONERE_BRANCH_H
#define EXTENDED_REGULAR_EXPRESSIONERE_BRANCH_H

namespace extended_regular_expression {

template< typename E > class ere_expression;

template<typename E>
class ere_branch : public ere_base<E>
{
typedef typename grammar_to_parser::basic_parser<E>::parser_list 
                                                                                                                                parser_list;
        
        class ere_expression_ere_branch : public ere_base<E>
        {
                grammar_to_parser::basic_choice<E, ere_expression<E> >  m_ere_expression;       
                grammar_to_parser::basic_choice<E, ere_branch<E> >              m_ere_branch;
        public: 
                ere_expression_ere_branch() : ere_base<E>() {};
                ~ere_expression_ere_branch() {};
                
                unsigned long recognize( const E* buf, 
                                                                const unsigned long buf_length, 
                                                                const unsigned long buf_offset,
                                                                bool try_positions = true );
                void push_parsers( parser_list& l );
                
                void assign_matches( matches::match_key parent_address, 
                                                        unsigned long& branch_pos, 
                                                        matches& m );
        };
        
        grammar_to_parser::basic_choice<E, ere_expression<E> >  m_ere;
        grammar_to_parser::basic_non_terminal<E,ere_expression_ere_branch>
                                                                                                                        m_ere_expression_ere_branch;

public:
    ere_branch() :
                ere_base<E>(), 
                m_ere_expression_ere_branch() {};
        ~ere_branch() {};

        unsigned long recognize( const E* buf, 
                                                        const unsigned long buf_length, 
                                                        const unsigned long buf_offset,
                                                        bool try_positions = true );
        
        void assign_matches( matches::match_key parent_address, 
                                                unsigned long& branch_pos, 
                                                matches& m );
        
        bool is_right_anchor()
        {
                return m_ere.is_parsed() && m_ere->is_right_anchor();
        }
                
        void push_parsers( parser_list& l );
};

};

#endif

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