Re: Set of allowable next tokens

mah@nestroy.wu-wien.ac.at
Mon, 14 Jan 91 12:38:22 GMT

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Newsgroups: comp.compilers
From: mah@nestroy.wu-wien.ac.at
Keywords: yacc, parse, debug
Organization: Wirtschaftsuniversitaet Wien
References: <1991Jan11.203916.20495@murdoch.acc.Virginia.EDU>
Date: Mon, 14 Jan 91 12:38:22 GMT

In article <1991Jan11.203916.20495@murdoch.acc.Virginia.EDU>, jmr1g@ra.cs.Virginia.EDU (Jeremiah M. Ratner) writes:
|> Is there any way i can configure yacc or some other tool to tell me,
|> at each step in a parse, the set of tokens that may follow the current
|> token?


In the book 'Compiler Construction using Unix' by Schreiner & Friedman
(sorry, I don't have the book here at work, and I don't recall the
publisher) a modification to yacc is described which prints the set of
allowed tokens when encountering a syntax error. It's actually sufficient
to modify the yaccpar file.


There is a tar file on a.cs.uiuc.edu in ~ftp/pub/friedman which contains the
modified yaccpar file.


- michael
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