configIni_parse.hpp

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//This file is part of Bertini 2.
//
//configIni_parser.hpp 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 3 of the License, or
//(at your option) any later version.
//
//configIni_parser.hpp 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 configIni_parser.hpp.  If not, see <http://www.gnu.org/licenses/>.
//
// Copyright(C) Bertini2 Development Team
//
// See <http://www.gnu.org/licenses/> for a copy of the license,
// as well as COPYING.  Bertini2 is provided with permitted
// additional terms in the b2/licenses/ directory.

 
 
#ifndef BERTINI_CONFIG_INI_PARSE_HPP
#define BERTINI_CONFIG_INI_PARSE_HPP
 
 
#include <boost/fusion/adapted.hpp>
#include <boost/fusion/include/adapted.hpp>

#define BOOST_SPIRIT_USE_PHOENIX_V3 1
 
 
#include <boost/spirit/include/qi_core.hpp>
#include <boost/spirit/include/qi.hpp>
#include <boost/phoenix/core.hpp>
#include <boost/phoenix/operator.hpp>
 
#include <boost/spirit/include/support_istream_iterator.hpp>
 
#include <boost/algorithm/string.hpp>
 
 
#include <iostream>
#include <string>
 
 
 
// this solution for *lazy* to_lower is adapted from the SO forum, user sehe.
// https://stackoverflow.com/questions/21516201/how-to-create-boost-phoenix-make-shared
//    post found using google search terms `phoenix construct shared_ptr`
namespace {
    struct to_lower_f
    {
        template <typename... A> struct result
        { typedef std::string type; };
 
        template <typename A>
        std::string operator()(A a) const {
            return boost::algorithm::to_lower_copy(a);
        }
    };
 
    using lazy_to_lower_ = boost::phoenix::function<to_lower_f >;
}
 
 
 
 
 
namespace bertini
{
    namespace settings
    {
        namespace parsing
        {
 
            template<typename Iterator, typename Skipper = ascii::space_type> //boost::spirit::unused_type
            struct ConfigToIni : qi::grammar<Iterator, std::string(), Skipper>
            {
 
 
                ConfigToIni() : ConfigToIni::base_type(root_rule_, "ConfigToIni")
                {
                    namespace phx = boost::phoenix;
                    using qi::_1;
                    using qi::_2;
                    using qi::_3;
                    using qi::_4;
                    using qi::_val;
                    using qi::eol;
                    using qi::eoi;
                    using qi::eps;
                    using qi::lit;
                    using qi::char_;
                    using qi::omit;
                    using boost::spirit::lexeme;
                    using boost::spirit::as_string;
 
                    root_rule_.name("ConfigToIni_root_rule");
 
                    root_rule_ = eps[_val = ""] >> *line_[_val = _val + _1+"\n"] >> -last_line_[_val = _val + _1];
 
 
                    line_.name("line_of_settings_input");
                    line_ = (eps >> colon_ >> yes_eol_)[_val = lazy_to_lower_()(_1) + "=" + _2];
 
                    last_line_.name("line_of_settings_input_with_no_eol");
                    last_line_ = (eps >> colon_ >> no_eol_)[_val = lazy_to_lower_()(_1) + "=" + _2];
 
                    colon_.name("Set of characters with no : or eol");
                    colon_ = lexeme[*(char_ -  ":") >> omit[":"] ];
 
                    yes_eol_.name("Set of characters with eol");
                    yes_eol_ = lexeme[*(char_ - eol - ";") >> omit[-(char_(';') >> *(char_ - eol) )] >> eol];
 
                    no_eol_.name("Set of characters with no eol");
                    no_eol_ = lexeme[*(char_  - ";") >> omit[-(char_(';') >> *(char_ ) )]];
 
//                                         debug(root_rule_);
//                                         debug(line_);
//                    debug(last_line_);
//                    debug(yes_eol_);
//                    debug(no_eol_);
//
//                                         BOOST_SPIRIT_DEBUG_NODES((root_rule_)
//                                                                  (line_)(last_line_)(yes_eol_)(no_eol_) )
 
 
 
                    using phx::val;
                    using phx::construct;
                    using namespace qi::labels;
                    qi::on_error<qi::fail>
                    ( root_rule_ ,
                     std::cout<<
                     val("config/input split parser could not complete parsing. Expecting ")<<
                     _4<<
                     val(" here: ")<<
                     construct<std::string>(_3,_2)<<
                     std::endl
                     );
                }
 
            private:
                qi::rule<Iterator, std::string(), ascii::space_type > root_rule_;
                qi::rule<Iterator, ascii::space_type, std::string()> line_, last_line_, colon_, yes_eol_, no_eol_;
 
            }; //end struct ConfigToIni
 
        } // end parsing namespace
    }// end settings namespace
}// end bertini namespace
 
 
 
 
 
 
#endif