[antlr-interest] Re: Modification of Node Attributes using Tree Grammar

[jsrs701]

--- In antlr-interest at y..., "Niall Gormley" <ngormley at h...> wrote:
> Hi,
> 
> Is it possible to use a Tree Grammar to modify Node attributes?
> 
> The node "i" is getting modified buy the call to "setVariantType" 
but I 
> can't seem to get it copied to the output AST for the dims 
expression. So 
> the real question might be, how can I get source node "i" to end up 
in the 
> output expression?
> 
> dims!
>   : #( LITERAL_DIM i:IDENT )
>     {
>     i.setVariantType(0);
>     #dims = #( #[LITERAL_DIM], #(i));
>     }
>   ;
> 

That's odd.  I pull this stunt all the time.  The only thing i can 
think of is to remove the parens in the expression #(i), and just 
leave it as #i.

#dims = #( [LITERAL_DIM], #i );

(I usually eschew the optional # in the [type] expressions, too.)

That should work like a charm.


 

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