[antlr-interest] TreeParser development: How to build an effective "dont care" rule?

[Bryan Ewbank]

The rule looks correct; however,  I suspect that you have problems
where the rule is used.  There must be a rule somewhere else that has
one too many "dontCare" matches in its production.

Perhaps something like a declaration that has an optional initial value?

To help you debug, use the "-trace" option and discover the rule being
processed when the error is detected.

- Bryan

On 9/15/06, luciano mantuaneli <mantu_lists at yahoo.com.br> wrote:
> Hi!
> I'm developing a TreeParser, and I wish to know how to create an rule that
> do nothing on matching any token.
> I tried to do this with this rule:
>
> dontCare:
>     .
> ;
>
> But, this rule doesn't seems to work properly. Depending on how my
> TreeParser  grammar is written, I get the following error message:
>
> <AST>: Mismatched Token: expecting any AST node
>
> My questions:
> 1)My dontCare rule is proper for the task mentioned above?
> 2)Do you know how this error message is related with my dontCare rule?