Re: Tagging in X3

On 06/08/2018 01:25 AM, Kent Hauser wrote:
> I am having a problem figuring out how to tag a rule attribute value 
> when the parser definition has a different value.
> 
> I have modified the `tag` method of the x3 error_handler to display the 
> source (first, last) & type-name of the AST when tagging. With this 
> modification & the following rules I am getting the following results:
> 
> *** source ***
> struct _tag_ident : annotate_on_success {};
> 
> auto const ident_p = lexeme[!digit >> +alphanum];
> auto const ident = rule<_tag_ident, ident_ref>{} = ident_p;
> 
> *** result ***
> 
> error_handler::tag: src = foo
> error_handler::tag: AST = boost::spirit::x3::unused_type
> 
> **************
> 
> I get identical results if I use the BOOST_SPIRIT_DEFINE macros. I also 
> get identical results if I wrap the lexeme parser in x3::raw.
> 
> I would have expected the x3::rule to assign parsed value to 
> `ident_ref`` & tagged that.
> 
> Any advise on how to get my desired result would be appreciated.
> 
> Thanks. Kent
> 
Could you please provide an attachment to a compilable .cpp file
or link to one?



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