On 1/22/13, David A. Wheeler <dwhee...@dwheeler.com> wrote:
> Is the sweet-expression BNF done?
>
> I've posted an updated "sweet.g" file in the "develop" branch that looks
> pretty good to me.  It contains an executable BNF, as well as various
> support definitions.  ANTLR gives it a clean bill of health in LL(1) mode,
> which I think is valuable because it gives us a nice rigorous check.
>
> A few points:
> * Restart lists turn out to be really easy to spec and implement... it just
> took a little while to get there :-).  I strongly believe we should include
> them, because they cleanly solve two use cases I'm concerned about (long
> library definitions and short let variable statements), and they only
> require a few lines to implement.  In particular, the BNF requires only a
> few lines, and the support routines don't require much more (in fact, in a
> recursive descent parser the support routines are trivial).  I realize
> that's not an opinion universally held, but I hope that everyone else can
> live with their inclusion (if you CAN'T let us know!).  And if there's a
> better way, let us know that too.
> * But should the *name* "restart list" continue?  Is "superlist" better?  Or
> something else?
> * This recurses to t_expr if given just #!something on a line, as I posted
> before.  That should provide "least surprise".
> * How should we handle FF/VT?  I'm currently claiming that lines with only
> FF/VT should be handled like ;-only lines, that is, completely ignored.
> Thoughts?
>
> Any other thoughts?  Anything else I've forgotten?

I'm not sure, but does it handle this?

foo
!  bar batz
; comment
!  nitz koo

Sincerely,
AmkG

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