[antlr-interest] error in my rule...
Trey Spiva
Trey.Spiva at embarcadero.com
Wed Dec 11 06:29:31 PST 2002
> Could you help me to understand what is wrong in my rule:
>
> query!
> :SELECT! a:selection_list
> {## = #([QUERY, "query"], #(SELECT, a));}
> (WHERE! b:where_list
> {## = #([QUERY, "query"], #(SELECT, a),#(WHERE, b));})?
> ;
>
> As output I want to get an AST of the form:
> #(QUERY #(SELECT a) #(WHERE b)), where
> QUERY is imaginary note and WHERE is optional.
>
> How could I rewrite this rule?
I believe that the AST declaration should be:
query!
:SELECT! a:selection_list (WHERE! b:where_list )?
{#query = #(#[QUERY, "QUERY"],
#([SELECT, "SELECT"], a),
#([WHERE, "WHERE"], b));
;
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