Front page | perl.perl5.porters |
Postings from March 2000
"Joseph N. Hall" <joseph@5sigma.com> wrote
> Well, yes, first you could (in theory) make interpolation context-sensitive.
> Again:
>
> @result = qs/select @cols from $table where $col = $val/
>
> Here, @cols needs to be ,-separated, $table and $col need one kind of
> interpolation, and $val needs another.
So it looks like you want to define your qs function to have a
sprintf()-like first argument:
@result = qs("select %a from %t where %c = %v", \@cols, $table, $col, $val);
where %a, %t etc trigger the appropriate form of interpolation.
(Of course, % is a daft choice for escape character - I've just used
it to illustrate the analogy with sprintf().)
And it can look quite neat if you make your query proformas objects:
my $query = new Query("select %a from %t where %c = %v");
@result = $query->qs(\@cols, $table, $col, $val);
So my point is not so much "The qs() syntax is too valuable to let you have
it" (though I suspect that would be the general p5p reaction) as
"The syntax doesn't do anything you can't do already". You don't
need any new syntax; you need new semantics, and that can be wrapped
in what I've been calling the qs() subroutine.
Mike Guy
Thread Previous
|
Thread Next