one_char_or_coll_elem_ere.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_EXPRESSIONONE_CHAR_OR_COLL_ELEM_ERE_H
#define EXTENDED_REGULAR_EXPRESSIONONE_CHAR_OR_COLL_ELEM_ERE_H

namespace extended_regular_expression {

template<typename E>
class one_char_or_coll_elem_ere
{
typedef typename grammar_to_parser::basic_parser<E>::parser_list 
                                                                                                                        parser_list;
typedef bracket_expression::bracket_expr<E>                                     bracket_expr_type;
typedef bracket_expression::collating_symbol<E>                         collating_symbol_type;
        
        class quoted_char
        {
                grammar_to_parser::basic_terminal<E,'\\'>                       m_backslash;
                grammar_to_parser::basic_choice<E, special_chars<E> >
                                                                                                                        m_spec_chars;
        public:
                quoted_char() {};
                ~quoted_char() {};
                
                void push_parsers( parser_list &l )
                {
                        l.push_back(&m_backslash);
                        l.push_back(&m_spec_chars);
                }
                unsigned long recognize( const E* buf, 
                                                                const unsigned long buf_length )
                {
                        return m_spec_chars->recognize(buf,buf_length);
                }
        };
        grammar_to_parser::basic_except_terminal<E,special_chars<E> >
                                                                                                                        m_ord_char;
        grammar_to_parser::basic_non_terminal<E,quoted_char>    m_quoted_char;
        grammar_to_parser::basic_terminal<E,'.'>                                m_dot;
        grammar_to_parser::basic_choice<E, bracket_expr_type >  m_bracket_expr;
public:
    one_char_or_coll_elem_ere() {};
    ~one_char_or_coll_elem_ere() {};

        void push_parsers( parser_list &l )
        {
                l.push_back(&m_ord_char);
                l.push_back(&m_quoted_char);
                l.push_back(&m_dot);
                l.push_back(&m_bracket_expr);
        }
        
        unsigned long recognize( const E* buf, 
                                                        const unsigned long buf_length,
                                                        const unsigned long buf_offset )
        {
                if( m_ord_char.is_parsed() )
                {
                        if( m_ord_char.get_valid() == buf[buf_offset] )
                        {
                                return collating_symbol_type::get_symbol_len(buf+buf_offset,
                                                                                                                buf_length-buf_offset);
                        }
                        else
                        {
                                return 0;
                        }
                } 
                else if( m_quoted_char.is_parsed() )
                {      
                        return m_quoted_char->recognize( buf+buf_offset,
                                                                                        buf_length-buf_offset );
                }
                else if( m_dot.is_parsed() )
                {
                        return collating_symbol_type::get_symbol_len( buf+buf_offset,
                                                                                                        buf_length-buf_offset );
                }
                else
                {
                        return m_bracket_expr->recognize( buf+buf_offset,
                                                                                        buf_length-buf_offset );
                }
        }
};


};
#endif

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