Re: [Boost-users] [spirit] first steps

Subject: Re: [Boost-users] [spirit] first steps
From: Hartmut Kaiser (hartmut.kaiser_at_[hidden])
Date: 2010-02-18 14:30:20

> > Spirit has a built-in construct for lists:
> >
> >    ~*char( ':' ) % ':'
> >
> > If you use attribute parsing you can simply perform the following:
> >
> >  std::vector< std::string > list_of_strings;
> >
> >         parse( begin, end,
> >                ~*char( ':' ) % ':',
> >                list_of_strings
> >               );
> >
> > Nice huh?
> 
> Nice, but IUUC, it won't take into account the type of the elements,
> right?
> I tried to do the following (but it doesn't match the input string):

> template <typename Iterator>
> struct sensor_parser : qi::grammar<Iterator, details::sensor(),
> ascii::space_type>
> {
>   sensor_parser() : sensor_parser::base_type(start)
>   {
>     using qi::int_;
>     using qi::lit;
>     using qi::double_;
>     using qi::lexeme;
>     using qi::eol;
>     using ascii::char_;
> 
> 		text %= lexeme[+(char_ - ':')];
> 
>     start %=
> 			int_ >> ':'
> 			>> text >> ':'
> 			>> int_ >> ':'
> 			>> int_ >> ':'
> 			>> text >>
> 			-(':' >> int_) >>
> 			-(':' >> text) >>
> 			eol
>       ;
>   }

Your last 'text' parser eats your '\r\n' characters. As a result the eol parser fails.

Regards Hartmut

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