[antlr-interest] Re: Lexer not putting colon back

[Sriram Durbha]

hi ter,monty ,

i think this is how LL works... please read my earlier post in this
thread, and correct me if im wrong..
--- mzukowski at yci.com wrote:
> I can't really say why it didn't work.  Could you post the generated
> code
> for that rule when k=2?  The lexer analysis has to do some special
> things to
> not analyze too deeply.  If you think of nextToken() as an
> alternative block
> of all un-protected lexer rules, then you would see that the analysis
> for
> your rule doesn't include looking at what is coming as the next
> complete
> token.  If it did look beyond that then you would get a lot more
> ambiguities
> which don't make sense for a lexer.  Ter can correct me here, but I
> think
> that's what is going on.
> 
> Monty
> 
> -----Original Message-----
> From: Paul J. Lucas [mailto:dude at darkfigure.org]
> Sent: Friday, November 15, 2002 10:17 AM
> To: antlr-interest at yahoogroups.com
> Subject: [antlr-interest] Re: Lexer not putting colon back
> 
> 
> --- In antlr-interest at y..., mzukowski at y... wrote:
> > Then use a syntactic predicate
> > 
> > QNAME ((':' ~('='))=>':' QNAME)?
> 
> That works; thanks.  But why is it necessary to do this?  The other
> way
> really seems like it should have worked.
> 
> - Paul
> 
> 
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