Greetings!
On Thu, 2011-07-14 at 16:11 -0700, Roy Metzger wrote:
> Hi all,
>
> Let's say I have something like this:
>
> rule: ( 'stuff' e1=expression)?
> statement
> ('stuff' e2=expression)? ;
>
> Now, I would like to know is there a way to dynamically flip rules on/off.
> For example, when
> e1 is present e2 is not, and when e2 exists, e1 does not.
>
I probably do not actually understand your question. But perhaps you do
not really need predicates...
rule :
( 'stuff' expression statement )
| ( statement 'stuff' expression )
;
>
> Based on my research I found that predicates may be of help to me(of course,
> aside from refactoring), but
>
> I'm really not sure how to use them, as I'm still very new to antlr.
>
>
> Could something like this work:
> rule
> @init{boolean b=false;}:
>
> ( 'stuff' e1=expression{b=true;})? {b}?=>expression
> statement
> ( 'stuff' e2=expression{b=false;})? {!b}?=>expression
>
> I would really appreciate if some of more experienced users would give me
> hints on this one.
>
> Thanks for any help
>
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