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/*=============================================================================
Copyright (c) 2016 Frank Hein, maxence business consulting gmbh
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
==============================================================================*/
#include <iostream>
#include <map>
#include <boost/spirit/home/qi.hpp>
#include <boost/spirit/home/qi/nonterminal/grammar.hpp>
#include <boost/spirit/include/phoenix.hpp>
#include <boost/foreach.hpp>
namespace qi = boost::spirit::qi;
typedef std::string::const_iterator iterator_type;
typedef std::string result_type;
template<typename Parser>
void parse(const std::string message, const std::string& input, const std::string& rule, const Parser& parser) {
iterator_type iter = input.begin(), end = input.end();
std::vector<result_type> parsed_result;
std::cout << "-------------------------\n";
std::cout << message << "\n";
std::cout << "Rule: " << rule << std::endl;
std::cout << "Parsing: \"" << input << "\"\n";
bool result = qi::phrase_parse(iter, end, parser, qi::space, parsed_result);
if (result)
{
std::cout << "Parser succeeded.\n";
std::cout << "Parsed " << parsed_result.size() << " elements:";
BOOST_FOREACH(result_type const& str, parsed_result)
{
std::cout << "[" << str << "]";
}
std::cout << std::endl;
}
else
{
std::cout << "Parser failed" << std::endl;
}
if (iter == end) {
std::cout << "EOI reached." << std::endl;
}
else {
std::cout << "EOI not reached. Unparsed: \"" << std::string(iter, end) << "\"" << std::endl;
}
std::cout << "-------------------------\n";
}
namespace grammars {
namespace phx = boost::phoenix;
template <typename Iterator>
struct ident : qi::grammar < Iterator, std::string(), qi::space_type>
{
ident();
qi::rule <iterator_type, std::string(), qi::space_type>
id, id_list, qualified_id;
};
template <typename Iterator>
ident<Iterator>::ident() : ident::base_type(id_list) {
using qi::on_error;
using qi::fail;
using qi::expect;
id = (qi::alpha | qi::char_('_')) >> *(qi::alnum | qi::char_('_'));
id_list = expect[id >> qi::lit(';')];
on_error<fail>(id_list,
phx::ref(std::cout)
<< "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!" << std::endl
<< "Error! Expecting "
<< qi::_4
<< " here: "
<< phx::construct<std::string>(qi::_3, qi::_2) << std::endl
<< "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!" << std::endl
);
}
}
int main() {
grammars::ident<iterator_type> id;
parse("expect directive, fail on first"
, "1234; id2;"
, "qi::expect[ id >> qi::lit(';') ]"
, id);
parse("expect directive, fail on second"
, "id1, id2"
, "qi::expect[ id >> qi::lit(';') ]"
, id);
parse("expect directive, success"
, "id1;"
, "qi::expect[ id >> qi::lit(';') ]"
, id);
return 0;
}
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