[antlr-interest] Re: optional sub rules

[mklogic <mklogic at yahoo.com>]

Could you give me an example of a rule that has all sub rules 
optional and doesn't generate nondeterminism warning? Thanks


--- In antlr-interest at yahoogroups.com, Terence Parr <parrt at j...> 
wrote:
> 
> On Monday, February 17, 2003, at 07:14 PM, mklogic <mklogic at y...> 
> wrote:
> 
> > Hi,
> >
> > Is it legal to have a rule that contains sub rules that are all
> > optional? I am getting nondeterminism warnings possibly because 
all
> > my sub rules are optional. If I remove all the questions marks, 
the
> > nondeterminism warning will away, but the meaning will be 
different.
> 
> It is legal, but your grammar apparently is nondeterministic 
without at 
> least something being matched in that rule.
> 
> Ter
> --
> Co-founder, http://www.jguru.com
> Creator, ANTLR Parser Generator: http://www.antlr.org
> Lecturer in Comp. Sci., University of San Francisco


 

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