On 1/29/13, David A. Wheeler <dwhee...@dwheeler.com> wrote:
> The current testsuite says that in sweet-expressions the following should
> mean "(foo (a b) . c)":
> foo
> ! a b
> ! .
> ! c
>
> SHOULD it mean that? My ANTLR BNF doesn't do that, it just treats lone "."
> as a period, but we *did* support that previously.
>
*shrug* I think it's bad style either way (either you use "," as a
symbol, or you use improper lists to structure what is code or
code-like). So either way will do. Can even be "unspecified" as far
as I'm concerned.
"." as symbol is not a good idea in general in Lisps, and improper
lists in code-like structures is almost as bad.
> It also has said that lone abbreviation on a line, followed by an indent,
> applies that abbreviation to the body. E.G., this would mean "(quote (aaa
> bbb))":
> '
> ! (aaa bbb)
>
> Again, my ANTLR BNF doesn't do that, but we used to. This one is debatable,
> since you can get the same effect with the word "quote" in Scheme (though
> that reasoning doesn't apply to Common Lisp).
It might be *clearer* for the user to write that, in some contexts.
So I think we should support this one at least.
>
> I've tweaked the ANTLR BNF so that initially-indented special comments are
> consumed, with the following hspace consumed too, and then recurses back to
> the t_expr production, like this:
> | (FF | VT)+ EOL retry2=t_expr {$v=$retry2.v;}
> | (initial_indent_no_bang | hspace+ )
> (n_expr {$v = $n_expr.v;} /* indent processing disabled */
> + | scomment hspace* sretry=t_expr {$v=$sretry.v;}
> | comment_eol retry3=t_expr {$v=$retry3.v;} )
> | initial_indent_with_bang error
> | EOF {generate_eof();} /* End of file */
> This is so that initially-indented block comments don't quietly disable
> sweet-expressions in the next line, like this:
> #| Hello |#
> foo bar
> I think should be "(foo bar)" not "foo" then "bar".
I vaguely remember hacking this change in the previous version (which
is why there's a second entry point for sweet-read). Or maybe
something else, don't remember well.
Sincerely,
AmkG
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