Re: Bison Parser negate production rules

"mco333" <mco333@sympatico.ca>
27 Mar 2007 09:27:57 -0400

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From: "mco333" <mco333@sympatico.ca>
Newsgroups: comp.compilers
Date: 27 Mar 2007 09:27:57 -0400
Organization: SunSITE.dk - Supporting Open source
References: 07-03-084
Keywords: parse, yacc
Posted-Date: 27 Mar 2007 09:27:57 EDT

May be you are after an error recovery procedure.
If so, then


    X : Y
        | U
        | error <read the doc>
        ;


will do the job. This does not negate the productions,
but is executed if X does not match Y or U.


This is documented in the Bison documentation.
eg:
http://www.slac.stanford.edu/comp/unix/gnu-info/bison_9.html


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