> You can pass trees from one rule to another as a parameter(s),
> maybe that might help, something like (probably requires more
> work to obtain the tree you are after):
>
> protected
> expression
> : e=conditionalOrExpression conditionalExpression[$e.tree]
> ;
>
> protected
> conditionalExpression[CommonTree TheActualASTRoot]
> : QMARK t=expression COMMA f=expression
> -> ^(ITE ${TheActualASTRoot} $t $f)
> |
> ;
>
> Regards, Mark
Thank you Mark, for your clever reply.
May I ask if there is any way to do somthing like this:
protected
expression
: e=conditionalOrExpression c=conditionalExpression[$e] -> $c
;
protected
conditionalExpression[conditionalOrExpression e]
: QMARK t=expression COMMA f=expression -> ^(ITE $e $t $f)
| -> $e
;
It seems cleaner to me, since this way subrules are not going to "play
dirty" with the root of their parents.
Unfortunately, this notation causes a "reference to undefined label in
rewrite rule: $e" error. The point may be "e" is not of
conditionalOrExpression type or, well, I don't really know why. Something
like that works with non-AST generating combined parsers (with more
classical actions, then). But it seems not to work with rewrite actions.
Thank you again,
Giampaolo
PS: I forgot to thank everybody for this really great open-source piece.
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