[antlr-interest] Help! Predicate failed messages

chain one chainone at gmail.com
Wed Dec 3 01:49:50 PST 2008


And there are a lot of  error tag in the final printed tree like this:
 (TYPE_DECL <error: temperature>

Is it caused by the failure of the predicate?


2008/12/3 chain one <chainone at gmail.com>

> procedure_id
>      : { isFirst }? id=IDENT { addId($id.getText(),PROCEDURE_IDENT); }
>              |  nid=PROCEDURE_IDENT { $nid.setType(IDENT);} ->
> ^(PROCEDURE_ID[] PROCEDURE_IDENT)
>              ;
> In the first pass, isFirst  is true, and in the second pass, isFirst is set
> to be false.
> When running the generated Java code, it seems every time
> the predicate fails, there will be an error message coming out like this:
>
> line 43:41 rule named_types failed predicate: { isFirst }?
>
> Could it be ignored? or there is something wrong with my grammar file?
>
>
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