Re: grammars

Ralf Laemmel <Ralf.Laemmel@cwi.nl>
10 Aug 2003 10:49:55 -0400

          From comp.compilers
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From: Ralf Laemmel <Ralf.Laemmel@cwi.nl>
Newsgroups: comp.compilers
Date: 10 Aug 2003 10:49:55 -0400
Organization: Compilers Central
References: 03-08-016
Keywords: parse
Posted-Date: 10 Aug 2003 10:49:54 EDT

Buddy wrote:
>
> Can all ambiguous grammars be changed into unambiguous grammars?
>
> [Well, sure, you can delete stuff until it's not ambiguous any more.
> But I presume the question you're asking is whether there's always an
> unambiguous grammar that recognizes the same language as an ambigous
> one. -John]


Yet another answer to this is: Don't.


Say, maybe you don't want to get an nonambiguous grammar because the
problems are of a nature that you better use semantic predicates or
other means to disambiguate at a level above purely context-free
expressiveness.


Ralf


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