xml_attribute_list_parser.h

/***************************************************************************
 *   Copyright (C) 2005 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 GRAMMAR_TO_PARSERBASIC_XML_ATTRIBUTE_LIST_PARSER_H
#define GRAMMAR_TO_PARSERBASIC_XML_ATTRIBUTE_LIST_PARSER_H

namespace xml_parser {
template< typename E >
class basic_xml_attribute_list_parser : 
                        public grammar_to_parser::basic_simple_non_terminal<E>
{
public:
typedef grammar_to_parser::basic_simple_non_terminal<E> non_terminal;
typedef std::list< basic_xml_attribute_parser<E>* > attributes_parsers_list;
typedef typename attributes_parsers_list::iterator attributes_parsers_list_iterator;
typedef typename grammar_to_parser::basic_parser<E>::parser_list parser_list;
typedef typename grammar_to_parser::basic_parser<E>::parser_list_iterator
                                                                                                                parser_list_iterator;

        
        basic_xml_attribute_list_parser() :
                grammar_to_parser::basic_simple_non_terminal<E>()
        {};
        
                          
        void push_parsers( parser_list &l )
        {
                attributes_parsers_list_iterator it = m_attributes_parsers.begin();
                while( it != m_attributes_parsers.end() ) 
                {
                        l.push_back((*it));
                        it++;
                }
        }
        
        
        // called from xml_element_parser
        void assign_attributes_parsers( attributes_parsers_list &l )
        {
                m_attributes_parsers.empty();
                attributes_parsers_list_iterator it = l.begin();
                while( it != l.end() ) 
                {
                        m_attributes_parsers.push_back((*it));
                        it++;
                }
        }

        virtual unsigned long parse( const E *buf, const unsigned long buf_length )
        {
                prepare_for_parsing();
        
                attributes_parsers_list attributes_parsers;
                attributes_parsers_list_iterator parse_iterator = m_attributes_parsers.begin();
                bool is_parsed = true;
        
                // copy to temporary list seems to be best to me
                while( parse_iterator != m_attributes_parsers.end() ) 
                {
                        attributes_parsers.push_back( *(parse_iterator++) );
                }
                while( !attributes_parsers.empty() && is_parsed )
                {
                        parse_iterator = attributes_parsers.begin();
                        is_parsed = false;
                        while( parse_iterator != attributes_parsers.end() && 
                                        !is_parsed && m_parsed_size <= buf_length )
                        {
                                (*parse_iterator)->parse( buf+m_parsed_size, buf_length-m_parsed_size );
                                if( is_parsed = (*parse_iterator)->is_parsed() && 
                                        (*parse_iterator)->get_use_type() != basic_xml_attribute_parser<E>::PROHIBITED)
                                {
                                        m_parsed_size += (*parse_iterator)->parsed_size();
                                        parse_iterator = attributes_parsers.erase(parse_iterator); // exclude from parsing
                                }
                                else if( is_parsed && 
                                                (*parse_iterator)->get_use_type() == basic_xml_attribute_parser<E>::PROHIBITED)
                                {
                                        is_parsed = false;
                                        break;
                                }
                                else parse_iterator++; // continue with next
                        }
                }
                // check the rest, if not only optional attribute
                while( !attributes_parsers.empty() ) 
                {
                        parse_iterator = attributes_parsers.begin();
                        if( (*parse_iterator)->get_use_type() == basic_xml_attribute_parser<E>::OPTIONAL ||
                                (*parse_iterator)->get_use_type() == basic_xml_attribute_parser<E>::PROHIBITED)
                                attributes_parsers.erase(parse_iterator);
                        else
                                break; // in this case, the parse failed - required attribute not found
                }
                if( !attributes_parsers.empty() ) m_parsed_size = 0;
                else m_is_parsed = true;
        
                return m_parsed_size;
        }

        virtual std::basic_istream<E>& parse( std::basic_istream<E>& is )
        {
                // TODO - implement
                prepare_for_parsing();
                return is;
        }
        
protected:
        attributes_parsers_list                 m_attributes_parsers;

};

typedef basic_xml_attribute_list_parser<char> xml_attribute_list_parser;
typedef basic_xml_attribute_list_parser<wchar_t> wxml_attribute_list_parser;

typedef std::list< basic_xml_attribute_parser<char>* > attributes_parsers_list;
typedef std::list< basic_xml_attribute_parser<wchar_t>* > wattributes_parsers_list;

};

#endif

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