[antlr-interest] lexical nondeterminism Or rule contain rule

[Terence Parr]

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
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