[antlr-interest] (newbie question) rewrite rule

[Randall R Schulz]

On Monday 09 July 2007 13:53, ali azimi wrote:
> Hi,
>
>   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)?)*')'

This right-hand-side allows an arbitrary sequence of nothing but commas 
following the initial expression. Is that what you want?

If not, change it to this:

   actualparameters
  :lc = '(' expression ? ( ',' expression ) * ')'


>  ->^(SLIST[$lc] (expression?)*)
>  ;
>
>   ...
>
>   AL


By the way, why are you so sparing with whitespace? ANTLR grammars are 
hard enough to read as it is, but cramming everything together just 
makes it harder.


Randall Schulz