parsers/parser.hpp

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//
// (c) Copyright 2015 DESY, Eugen Wintersberger <eugen.wintersberger@desy.de>
//
// This file is part of libpniio.
//
// libpniio 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.
//
// libpniio 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 libpniio.  If not, see <http://www.gnu.org/licenses/>.
// ===========================================================================
//
// Created on: Jan 23, 2015
//     Author: Eugen Wintersberger <eugen.wintersberger@desy.de>
//
//

#pragma once

#include<pni/core/types.hpp>
#include <boost/spirit/include/qi.hpp>

#include "../exceptions.hpp"
#include "get_rule_type.hpp"
#include "conversion_trait.hpp"

namespace pni{
namespace io{

    //------------------------------------------------------------------------
    template<
             typename T,
             typename ITERT = pni::core::string::const_iterator
            >
    class parser 
    {
        public:
            typedef ITERT iterator_type;
            typedef T     result_type;
            typedef boost::spirit::qi::expectation_failure<iterator_type> expectation_error;
        private:
            typedef conversion_trait<result_type>   trait_type;
            typedef typename trait_type::read_type  read_type;
            typename get_rule_type<iterator_type,read_type>::type _rule;

        public:
            result_type operator()(const pni::core::string &data) const
            {
                using namespace boost::spirit;
                using namespace pni::core;

                read_type   buffer;
                
                try
                {
                    if(!qi::parse(data.begin(),data.end(),_rule>qi::eoi,buffer))
                    {
                        throw parser_error(EXCEPTION_RECORD,
                                "Failure parsing primitive type!");
                    }

                }
                catch(const expectation_error &error)
                {
                    throw parser_error(EXCEPTION_RECORD,
                            "Syntax error!");
                }

                try
                {
                    return trait_type::convert(std::move(buffer));
                }
                catch(...)
                {
                    throw parser_error(EXCEPTION_RECORD,
                            "Failure during type conversion!");
                }

            }
    };


//end of namespace
}
}