extracting string from bracket using boost spirit

Question

I have the following string:

%%DocumentNeededResources: CMap (90pv-RKSJ-UCS2C)

I want to parse it and store/extract the 90pv-RKSJ-UCS2C string which is in bracket.

My rule is as follows:

std::string strLinesRecur = "%%DocumentNeededResources: CMap (90pv-RKSJ-UCS2C)";
std::string strStartTokenRecur;
std::string token_intRecur;
bool bParsedLine1 = qi::phrase_parse(strLinesRecur.begin(), strLinesRecur.end(), +char_>>+char_,':', token_intRecur, strStartTokenRecur);

Answer 1

It looks like you thought a skipper is a split delimiter. It's quite the opposite (Boost spirit skipper issues).

In this rare circumstance I think I'd prefer a regular expression. But, since you asked here's the spirit take:

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#include <boost/spirit/include/qi.hpp>

namespace qi = boost::spirit::qi;

int main() {
    std::string const line = "%%DocumentNeededResources: CMap (90pv-RKSJ-UCS2C)";

    auto first = line.begin(), last = line.end();

    std::string label, token;
    bool ok = qi::phrase_parse(
            first, last, 
            qi::lexeme [ "%%" >> +~qi::char_(":") ] >> ':' >> qi::lexeme["CMap"] >> '(' >> qi::lexeme[+~qi::char_(')')] >> ')',
            qi::space,
            label, token);

    if (ok)
        std::cout << "Parse success: label='" << label << "', token='" << token << "'\n";
    else
        std::cout << "Parse failed\n";

    if (first!=last)
        std::cout << "Remaining unparsed input: '" << std::string(first, last) << "'\n";
}

Prints

Parse success: label='DocumentNeededResources', token='90pv-RKSJ-UCS2C'