Ticket #6291: keyword_issue.cpp

// test case demonstrating change in results of "distinct" repo parser

#include <boost/spirit/include/qi.hpp>
#include <boost/spirit/repository/include/qi_distinct.hpp>
#include <boost/spirit/include/qi_attr.hpp>


int main(int argc, char **argv) {
    using boost::spirit::repository::distinct;
    using namespace boost::spirit::qi;
    typedef std::string::iterator iterator;
    using boost::spirit::ascii::space_type;
    using boost::spirit::attr;
    using boost::spirit::ascii::string;

    boost::spirit::qi::rule<iterator, std::string(), space_type> string_keyword;
    // removing the preamble "+" from the rule and the input data causes this to pass
    string_keyword %= '+' >> (distinct("0-9a-zA-Z_")[string("ALPHA")] |
                              distinct("0-9a-zA-Z_")[string("BETA")]);

    using boost::spirit::qi::phrase_parse;
    using boost::spirit::qi::ascii::space;

    std::string inputdata("+ BETA");
    std::string result;
    std::string::iterator input_it = inputdata.begin();
    if (!phrase_parse(input_it, inputdata.end(), string_keyword, space, result) ||
        (input_it != inputdata.end())) {
        std::cerr << "parse failed\n";
        return 1;
    }
    if (result != "BETA") {
        // beginning with Boost 1.46, the result value is "B"
        std::cerr << "keyword parse produced incorrect result " << result;
        std::cerr << " vs. expected value BETA\n";
        return 1;
    }
    return 0;
}