AW: [stringtemplate-interest] Template-Operator []

[Dreyer Ulf (CR/APA3)]

Hi Terence!
 
> >     The [] operator in a template concatenates 2 lists 
> (enumerables).
> >     so that
> >     A = [1,2,3]
> >     B = [a,b,c]
> >     $[A,B]$  = [1,2,3,a,b,c]
> >
> >     is there a way to get the following list out of A and B?
> >     [ [1,2,3] , [a,b,c] ]

> Hi.  good question.  Hmmm...not sure.  
> That operator really needs to  flatten the lists.  
> Can you give an example usage?

Ok, You got me.
I can think of examples but they all can be solved in a 
different way. 
One example would be as follows :

NumberedList(List) ::=<<
List $i$: $List;separator=(";")$ $\n$
>>

[...]
$[listA,listB]:NumberedList()$
[...]
The above "enumerates" lists one level below of what I would
think.

This would be ok though, if [[listA],[listB]] would work that
way. But it can not because the []-Operator has to dereference all 
elements within.

But as I can avoid all of those instances at the moment it is
not that important.

Another thing I noticed is that first() and rest() functions
can not be combined. (as in  first(rest(someList)))
Is this intentional?


Thanks,

Ulf