From: torbenm@app-7.diku.dk   
      
   "Aaron Gray"  writes:   
      
      
   > What would be a good tool is something that takes an ambiguous   
   > grammar an generates a GLR grammar. I am not sure whether this   
   > problem is decidable or not though.   
      
   GLR parsers are able to parse ambiguous grammars, so this is trivially   
   true.  What you need, however, is a way to choose which one of the   
   many parse trees that the GLR parser gives you that you want, and I   
   can see no way of getting this automatically -- unless you can   
   formally specify disambiguation rules (such as operator precedence   
   rules).  Operator precendence rules are insufficient to make the C++   
   grammar unambiguous, though.   
      
   	Torben   
      
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