[antlr-interest] Template for optional element

[Mark Volkmann]

On Jan 29, 2008 1:57 AM, Oscar Pérez <oscar at perex.org> wrote:
> Hi.
>
> I'm new in ANTLR.
>
> I want to use a template for a rule like this:
>
> func: ^( Func ID params* body ) -> func(name={$ID.text},
> par={$params.st}, block={$body.st});
>
> but if there aren't params in source text, then broken!!!
>
> ¿How can I write a template for optional elements?

Does it solve the problem to use something like this in your template?

<if(params)><params><endif>

-- 
R. Mark Volkmann
Object Computing, Inc.