The problem is that sometimes you want the VECTOR_EXPR as such. And when you want which is not evident from the context of executing these 'expression' rules. Perhaps this is a use-case for scopes?
And we haven't even gotten to the difficult cases of handling these tuples (think something like VECTOR_EXPR = VECTOR_EXPR) ;) On Fri, 2009-05-01 at 17:08 -0700, Terence Parr wrote: > On May 1, 2009, at 5:03 PM, Steve Ebersole wrote: > > > Lets say sortKey comes back as > > ^( VECTOR_EXPR > > ^( COLUMN > > ALIAS_REF["a"] IDENTIFIER["col1"] > > ) > > ^( COLUMN > > ALIAS_REF["a"] IDENTIFIER["col2"] > > ) > > ) > > > > I'd really like sortSpecification to go from: > > > > ^( SORT_SPEC ^( VECTOR_EXPR["see above"] ) ) > > > > to: > > > > ^( SORT_SPEC ^( COLUMN ALIAS_REF["a"] IDENTIFIER["col1"] ) ) > > ^( SORT_SPEC ^( COLUMN ALIAS_REF["a"] IDENTIFIER["col2"] ) ) > > > > so its gets split from one Tree to two > > Ok, that's easy enough I think. Have sortKey not return VECTOR_EXPR as > the root; you don't want it. THen, if we are ignoring the other rules > for now, this is what you want: > > > sortSpecification : sortKey -> ^( SORT_SPEC sortKey )+ ; > > The + on the outside duplicates the root, one for each child pulled > from sortKey...ack, wait. Will it see the tree coming back from > sortKey as a "list" or a single element...hmm...try that first and see > what happens. > > Then, if that works, we can think about the rule references I deleted. > > Ter -- Steve Ebersole <st...@hibernate.org> Hibernate.org List: http://www.antlr.org/mailman/listinfo/antlr-interest Unsubscribe: http://www.antlr.org/mailman/options/antlr-interest/your-email-address --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "il-antlr-interest" group. To post to this group, send email to il-antlr-interest@googlegroups.com To unsubscribe from this group, send email to il-antlr-interest+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/il-antlr-interest?hl=en -~----------~----~----~----~------~----~------~--~---
