[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Very minor grammar tweak



Looks good to me.

foo
  \\
  \\

===>

(foo)

?

whereas:

foo

===>

foo

?

Sincerely,
AmkG

On 7/31/13, David A. Wheeler <dwheeler@xxxxxxxxxxxx> wrote:
> I intend to include a very minor grammar tweak.
>
> Previously "(GROUP_SPLIT | scomment) EOL DEDENT" was illegal because
> there was no way to return an "empty" value.
> Oh, wait, we can do that now!  So we may as well allow it.
> That would permit, for example:
> a b c
> !   d e
> !   #| this scomment is the last child line |#
> => (a b c (d e))
>
> This removes one token from the grammar, and a few lines
> from the implementation.  Here's the grammar change:
>
>  group_line returns [Object v]
>    : (GROUP_SPLIT | scomment) hs /* Initial; Interpet as group */
>        (group_i=it_expr {$group_i} /* Ignore initial GROUP/scomment */
>         | comment_eol
>           (INDENT g_body=body {$g_body} /* Normal GROUP use */
> -          | same {empty_tag} )) ;
> +          | {empty_tag} )) ;
>
>
> Comments?
>
>
> --- David A. Wheeler
>
>