There are 3 ingredients in vi which, when combined, via the Chom   
   ky-Schuetzenberger Theorem, may give it the power to fully emulate simple   
   syntax direct translations and push down transducers ... and possibly even   
   syntax directed translations.   
      
   (1) "%" to match brackets; with the important condition that this works on at   
   least 2 different kinds of brackets   
   (2) the regular expression facility; particularly its ability to name and use   
   parameters   
   (3) the search & replace function.   
      
   So, here's a simple challenge of sorts to test the idea: write a vi script   
   that converts between infix and postfix order with at least two levels of   
   operator precedence. I don't know if it can actually be done.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)