Re: YACC with infinite lookahead

bromage@cs.mu.OZ.AU (Andrew Bromage)
27 May 1999 23:21:23 -0400

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From: bromage@cs.mu.OZ.AU (Andrew Bromage)
Newsgroups: comp.compilers
Date: 27 May 1999 23:21:23 -0400
Organization: Computer Science, The University of Melbourne
References: 99-05-072 99-05-095
Keywords: parse, yacc, C++

G'day all.


Akim Demaille <demaille@solo.enst.fr> writes:


>What exactly are the problems given to LALR(1) by C++?


The biggie is the famous rule of C++ grammar which goes something like
this:


If it looks like a declaration, then it is.
Otherwise, if it looks like a statement, then it is.
Otherwise, it's a syntax error.


Naturally, such a rule would only be needed if the rules for
declarations and statements are so ambiguously overlapped that the
usual arsenal of lexical feedback hacks won't work.


Cheers,
Andrew Bromage

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