[antlr-interest] (newbie question) rewrite rule

[David Holroyd]

On Mon, Jul 09, 2007 at 01:53:19PM -0700, ali azimi wrote:
> The following rewrite rule does not produces any error messages. But
> do you think it is correct? Can I use (expression?)* in the following?
>    
>   actualparameters
>  :lc='('expression?(','(expression)?)*')'
>  ->^(SLIST[$lc] (expression?)*)
>  ;

Since the grammar allows for zero or more occurances of 'expression' on
the left of the rewrite, you can just use 'expression*' on the right
hand side:

  actualparameters
	:	lc='(' expression? ( ',' expression? )* ')'
		-> (SLIST[$lc] expression*)


ta,
dave

-- 
http://david.holroyd.me.uk/