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Date: Wed, 30 Nov 2005 10:06:02 -0000
Message-ID: <CDA511FF6152D14E922434CE338CE8BB275845@leedsmet-exch1.leedsmet.ac.uk>
Thread-Topic: [PHP-DEV] Labeled Break (nothing at all whatsoever to do with GOTO)
Thread-Index: AcX1T+NFErR8dWIZS9eQuwQE0M+R/gARHNkA
To: "Sara Golemon" <pollita@php.net>,
	<internals@lists.php.net>
Subject: RE: [PHP-DEV] Labeled Break (nothing at all whatsoever to do with GOTO)
From: M.Ford@leedsmet.ac.uk ("Ford, Mike")

On 30 November 2005 01:41, Sara Golemon wrote:

> , I'd like to turn the topic to a completely
> different language
> feature which (might) please enough people to get a rousing consensus.
>=20
> Actual labeled breaks.  Not the break+jump that was proposed
> earlier in the
> guise of a break statement, but an actual straightforward, no
> funny-business labeled break which does no more and no less than the
> current break N; construct, but allows the use of identifier labels
> rather=20
> than numbers which
> may change as the result of the addition or removal of break
> containers.

Well, as this is exactly what I proposed just yesterday, I'm + several thou=
sand for it (modulo my fairly nonexistent karma!).  I'd love to see this im=
plemented regardless of what happens to goto, as I completely don't care wh=
ether PHP has goto or not.
=20
>=20
> http://libssh2.org/patches/true_labeled_break.diff
>=20
> Usage:
>=20
> while FOO ($condition) {
>     /* statements */
>     break FOO;
>     /* more statements */
> }
>=20
> Or a stacked example:
>=20
> for FOO(;;) {
>     while BAR (true) {
>         foreach BAZ ($arr as $val) {
>             switch Foof ($value) {
>                 default:
>                     do Plop {
>                         break FOO;
>                     } while (false);
>             }
>         }
>     }
> }

I'm fairly agnostic on which syntax to use, although I see some benefit in =
distinguishing break labels from goto labels.  I do quite like the "as" sug=
gestion -- it seems really clear and readable.

=20
> * Labels can be repeated by siblings.  I'm not married to this, and it
> certainly has WTF potential.

Mmmm -- not too sure about this.  As you say, it possibly has slightly too =
much WTF potential.

> * Labeled breaks also apply to continue;  For example:

Of course.   I thought that went without saying. ;)

Cheers!

Mike

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Tel: +44 113 283 2600 extn 4730      Fax:  +44 113 283 3211=20


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