Parsing Problem

18 Aug 2003


      struct usmtf : public grammar<usmtf>
{
    template <typename ScannerT>

    struct definition
    {
        definition(usmtf const& self)
        {
            message = mainText;

            exerciseSet = !eol_p >> str_p("EXER")[do_print("EXER")]
...
...
ch_p('/') >> *(field >> ch_p('/')) >> ch_p('/');
            messageIdentifierSet = str_p("MSGID")[do_print("MSGID")] 
ch_p('/') >> *(field >> ch_p('/')) >> ch_p('/');
field =
                lexeme_d
                [
                    +(upper_p - ch_p('/') - eol_p)
                ];

            mainText = exerciseSet >> eol_p >> messageIdentifierSet
...
...
end_p;
        };
rule<ScannerT> message, mainText,
             exerciseSet, messageIdentifierSet, field;

        rule<ScannerT> const& start() const { return message; }
    };
};

Using this grammar above, it will parse 
EXER/EE/FF//MSGID//
using
   mainText = exerciseSet >> messageIdentifierSet >> end_p;


However, I want it to parse
EXER/EE/FF//
MSGID//

and 
    mainText = exerciseSet >> eol_p >> messageIdentifierSet >> end_p;
does not work.   Why?  How do I parse what I want?

Parsing Problem

jwwillcox2003