[antlr-interest] grammar and rewrite rule problem (newbie)

[ali azimi]

Hi,
   
  How can rules like the following ( r ) be dealt with without producing an infinite loop? Can you also tell me what the rewrite rule for it should look like?
   
  Grammar T;
   
  r:  a  ( c | d )*  ( e | f )? g  
  ;
   
  a:
  ;
   
  c:
  ;
  e:
  ;
  f:
  ;
  g:
  ;
    
 
  Thank you so much in advance.
   
  Best wishes,
   
  Al

       
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