Re: [Boost-users] Help me for spirit grammar definition! It is simple...

From: Joel de Guzman (joel_at_[hidden])
Date: 2008-04-11 17:02:21

钱晓明 wrote:
> I want to use spirit parsing some text file. The very basic element in 
> those files is string, float and int. For example:
> 123L
> "hello"
> 987.4343
> I wrote my grammar class:
> struct pm_parser : public grammar<pm_parser>
> {
>     template <typename ScannerT>
>     struct definition
>     {
>         definition(pm_parser const& self)
>         {
>              factor =
>                          int_p[show_int()]>>"L"
>                        | '"'>> *((~ch_p('"'))[show_char()]) >>'"'
>                        | real_p[show_double()]
>                        ;
>         }
>     rule<ScannerT>      factor;
>     rule<ScannerT> const& start() const { return factor; }
>     };
> };
> show_int, show_char, show_double are structs used to show int, char and 
> double value.  When I parse 1L, it works. But when I parse 1, it is 
> parsed twice(int_p and real_p are all works).
> How can I define grammar struct to parse text above without errors?

Please post to the spirit mailing list:
https://lists.sourceforge.net/lists/listinfo/spirit-general
Thanks!

Regards,
-- 
Joel de Guzman
http://www.boost-consulting.com
http://spirit.sf.net