[antlr-interest] Re: lexical nondeterminism Or rule contain rule

[idontwantanidwith2000init]

--- In antlr-interest at yahoogroups.com, Terence Parr <parrt at c...> 
wrote:
> 
> On Apr 8, 2004, at 4:30 AM, idontwantanidwith2000init wrote:
> 
> > Hi,
> > I have one lexical rule that contains another.
> > STRING: ( 'a'..'z'|'A'..'Z' )+
> > 	;
> >
> > STRING_LITERAL
> >   : '"'!
> >     ( '\\' .
> >     | ~('"'|'\n'|'\r')
> >     )*
> >     ( '"'!
> >     | // nothing -- write error message
> >     )
> > 	;
> >
> > I'm using eclipse.
> > It's warning me that I have nondeterminism but I'm not using
> > STRING_LITERAL and STRING in the same parser rule.
> > What can I do to avoid this nondeterminism?
> 
> Hi.  Both are considered valid tokens and hence nextToken has them 
as 
> alternatives.  Use protected keyword on one of the rules.
> 
> Terence
> --
> Professor Comp. Sci., University of San Francisco
> Creator, ANTLR Parser Generator, http://www.antlr.org
> Cofounder, http://www.jguru.com
> Cofounder, http://www.knowspam.net enjoy email again!
> Cofounder, http://www.peerscope.com pure link sharing



 
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