[antlr-interest] Lexers hoist simple preds now
Ric Klaren
klaren at cs.utwente.nl
Mon Sep 2 02:00:29 PDT 2002
Hi,
Good to see you at work on antlr again :) (now hope that I get some time in
the near future to do some of the last debugging sessions on the C++ part :( )
On Sat, Aug 31, 2002 at 04:27:54PM -0700, Terence Parr wrote:
> Haven't heard from anybody on my proposal, but I think it's a good idea
> so I've implemented it. Works great for the "beginning of line issue."
> Python-parsing lovers rejoice!
>
> You can gate rules in/out depending on semantic context now:
>
> A : {pred1}? 'a' ;
>
> Will only be tested upon pred1 by the lexer. In prior versions, it
> would enter the rule and then fail (as a validating pred not
> disambiguating pred).
<cheers at Ter>
> NOTE the really cool thing is that the C++ and C# output generators
> will not have to be modified because the code generator is called after
> I build the internal representation of nextToken rule. :) Woohoo!
<another cheer at Ter>
Some small questions:
Does this do anything for parsers as well ? (too lazy to read the code ;) )
I saw no patches in the documentation I trust these are still pending ;) ;) ;)
Cheers,
Ric
--
-----+++++*****************************************************+++++++++-------
---- Ric Klaren ----- klaren at cs.utwente.nl ----- +31 53 4893722 ----
-----+++++*****************************************************+++++++++-------
Wo das Chaos auf die Ordnung trifft, gewinnt meist das Chaos, weil es
besser organisiert ist. --- Friedrich Nietzsche
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