[antlr-interest] Semantic predicates during AST construction

[Jim Idle]

On Sun, 2008-10-05 at 15:16 +0200, Oliver B. Fischer wrote:

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> Dear all,
> 
> I found an old post to this list, suggesting to support semantic
> predicates during AST construction:
> http://www.antlr.org/pipermail/antlr-interest/2005-January/011050.html
> (See: > 4.)  Alternatives and construction predicates:  ^{ {<test>}? A |
> B })
> 
> Has this features been implemented? This is exactly what I need now... ;-)



It isn't clear what you are asking for - that post is from 2005.

Do you mean you want to know how to use semantic predicates, or that you
want to know how to conditionally create one type of tree over another:

{ predicate1 }? -> ^(THIS)
{ predicate2 }? -> ^(OR THAT)
-> ELSE


Jim

> 
> 
> Bye
> 
> Oliver
> 
> - --
> Oliver B. Fischer, Schönhauser Allee 64, 10437 Berlin
> Tel. +49 30 44793251, Mobil: +49 178 7903538
> Mail: o.b.fischer at gmx.de Blog: http://www.sw-blog.net
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