From: Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
To: Michael Heerdegen <michael_heerdegen@web.de>
Cc: Okam <okamsn@protonmail.com>, 49809@debbugs.gnu.org
Subject: bug#49809: [PATCH] Add macro 'pcase-setq'
Date: Thu, 05 Aug 2021 09:34:55 -0400 [thread overview]
Message-ID: <jwvr1f8rps0.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <87sfzowvp0.fsf@web.de> (Michael Heerdegen's message of "Thu, 05 Aug 2021 03:02:03 +0200")
Michael Heerdegen [2021-08-05 03:02:03] wrote:
> Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of
> text editors" <bug-gnu-emacs@gnu.org> writes:
>
>> Looks good.
>
> How much trouble would it be to provide a `setf' variant?
>
> A problem could be any syntax that is used for both pcase patterns and
> place expressions I guess.
Adding support for (setf (pcase PAT) VAL) is very easy to do without any
change to pcase or gv machinery.
Adding support for (setf PAT VAL), is a bit harder (and introduces
a risk because of the potential overlap, tho this risk is small: gv
places are normally defined for "eliminators" whereas pcase patterns are
usually defined for "constructors"), but still fairly easy.
Mixing pcase patterns and gv places as in
(setf `(,a . ,(aref V N)) EXP)
would be the most flexible option but I haven't thought much about how
hard it would be to implement, and I'm not sure it's worth the trouble.
Stefan
next prev parent reply other threads:[~2021-08-05 13:34 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-01 17:20 bug#49809: [PATCH] Add macro 'pcase-setq' Okam via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-08-04 7:14 ` Lars Ingebrigtsen
2021-08-04 23:06 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-08-05 1:02 ` Michael Heerdegen
2021-08-05 13:34 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors [this message]
2021-08-05 15:00 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-08-06 1:42 ` Michael Heerdegen
2021-08-06 4:07 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-08-06 4:28 ` Michael Heerdegen
2021-08-06 22:33 ` Okam via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-08-07 2:11 ` Michael Heerdegen
2021-08-11 21:57 ` Lars Ingebrigtsen
2021-08-12 6:13 ` Michael Heerdegen
2021-08-12 12:11 ` Okam via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-08-12 15:06 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-08-13 2:55 ` Michael Heerdegen
2021-08-13 5:17 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-08-13 5:26 ` Michael Heerdegen
2021-08-07 15:42 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-08-09 0:28 ` Michael Heerdegen
2021-08-09 12:51 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-08-10 3:13 ` Michael Heerdegen
2021-08-12 16:13 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
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