[antlr-interest] "explosion" rewrite

[Terence Parr]

Hi Steve, what's the tree you need rather than the output?
Thanks,
T
On May 1, 2009, at 1:14 PM, Steve Ebersole wrote:

> Is there a syntax to "explode" a subrule result (sorry don't know a
> better term).
>
> I have a rule:
>
> sortSpecification
>    : sortKey collationSpecification? orderingSpecification?
>        -> ^( SORT_SPEC sortKey collationSpecification?
> orderingSpecification? )
>    ;
>
> The result of the sortKey subrule could be a Tree of type VECTOR_EXPR
> (its a "row value constructor" for those familiar with SQL).
>
> In terms of eventual output, this rule translates as "(sort_key1,
> sort_key2) asc" where "sort_key1, sort_key2)" is the VECTOR_EXPR.
>
> Instead what I need to have happen is "sort_key1 asc, sort_key2 asc".
>
> I started down the path of trying an @after in the sortSpecification  
> and
> calling out to some java code to mutate the tree manually.  But I'd
> prefer to keep this in the grammar if at all possible.
>
>
> -- 
> Steve Ebersole <steve at hibernate.org>
> Hibernate.org
>
>
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