From: Richard Stallman <rms@gnu.org>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: emacs-devel@gnu.org
Subject: Re: Code for cond*
Date: Wed, 28 Feb 2024 22:50:30 -0500 [thread overview]
Message-ID: <E1rfXRG-0002lt-SO@fencepost.gnu.org> (raw)
In-Reply-To: <jwva5notx6t.fsf-monnier+emacs@gnu.org> (message from Stefan Monnier on Sun, 25 Feb 2024 10:03:48 -0500)
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> - Which example was that? Have you found many others?
Sorry, I don't seem to have a copy of it I can find.
I looked for it in my mail archive about this issue
but did not see it. Mayne what I was sent was function names
and I looked at them in the source code.
I think someoene sent me a list of examples, in December perhaps,
to show me how pcase is often used. Naybe the items in that list
were function names, which would explain why I can't search for that email.
> - What do you reply to my own experience that we often want to accept
> not only longer lists but also shorter lists?
Maybe you are right, but I don't think I have seen an example of it.
Hmm, was this the purpose of proposing the cl-lambda pattern operator?
I agree it could make sense to combine these wo features ino one,
if there is a clean way to do it There oould be two flags:
* Ignore excess list elements. That is what I implemented as
(cdr-safe ...).
* Accept shorter lists. That could be called (truncate-ok ...).
(truncate-ok `(foo ,a ,b)) would match (foo lose quux) or
(foo lose) or just (foo).
These two flags are opposutes in spirit, but they do not conflict; it
would make sense to set both flags at once.
(cdr-safe (truncate-ok `(foo ,a ,b)))
Another possible approach is to specify minimum and maximum list
length for the data to be matched.
(list-length 1 nil `(foo ,a ,b))
where nil means "no maximum length".
However, we would not want `list-length' to affect sublists.
Nor '`truncate-ok'. Basically, I think allowing a shorter list
is something that I think would be desirable for one level of list structure
whereas `cdr-safe' seemed to make sense for nested levels.
--
Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)
next prev parent reply other threads:[~2024-02-29 3:50 UTC|newest]
Thread overview: 134+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-18 3:37 Code for cond* Richard Stallman
2024-01-18 4:59 ` Emanuel Berg
2024-01-20 3:39 ` Richard Stallman
2024-01-24 12:37 ` Po Lu
2024-01-24 19:12 ` Alan Mackenzie
2024-01-27 3:35 ` Richard Stallman
2024-01-18 15:44 ` Andrea Corallo
2024-01-19 10:42 ` João Távora
2024-01-21 3:04 ` Richard Stallman
2024-01-21 20:05 ` Adam Porter
2024-01-22 5:32 ` tomas
2024-01-23 13:39 ` Richard Stallman
2024-01-24 6:02 ` Po Lu
2024-01-24 9:48 ` Stefan Kangas
2024-01-24 10:09 ` Emanuel Berg
2024-01-24 11:30 ` João Távora
2024-01-24 12:08 ` João Távora
2024-01-24 12:09 ` Po Lu
2024-01-24 12:22 ` Ihor Radchenko
2024-01-24 12:33 ` Po Lu
2024-01-24 13:34 ` Ihor Radchenko
2024-01-24 13:52 ` João Távora
2024-01-24 14:31 ` Po Lu
2024-01-27 3:35 ` Richard Stallman
2024-01-27 3:35 ` Richard Stallman
2024-01-24 14:07 ` Po Lu
2024-01-24 14:20 ` Ihor Radchenko
2024-01-24 14:34 ` Po Lu
2024-01-24 14:44 ` Ihor Radchenko
2024-01-24 14:47 ` João Távora
2024-01-24 15:28 ` Emanuel Berg
2024-01-24 16:30 ` Ihor Radchenko
2024-01-24 16:34 ` Emanuel Berg
2024-01-25 9:06 ` Po Lu
2024-01-25 9:55 ` Alfred M. Szmidt
2024-01-25 10:38 ` Eli Zaretskii
2024-01-25 11:29 ` Po Lu
2024-01-25 12:04 ` Emanuel Berg
2024-01-25 13:32 ` Po Lu
2024-01-25 14:08 ` Emanuel Berg
2024-01-25 13:19 ` Alfred M. Szmidt
2024-01-25 13:43 ` Emanuel Berg
2024-01-25 14:31 ` Eli Zaretskii
2024-01-25 15:02 ` Emanuel Berg
2024-01-25 15:29 ` Eli Zaretskii
2024-01-25 15:33 ` Alfred M. Szmidt
2024-01-25 15:50 ` Eli Zaretskii
2024-01-25 16:01 ` Alfred M. Szmidt
2024-01-25 16:13 ` Eli Zaretskii
2024-01-25 15:40 ` Emanuel Berg
2024-01-25 10:30 ` Eli Zaretskii
2024-01-25 11:27 ` Emanuel Berg
2024-01-24 12:15 ` Alan Mackenzie
2024-01-24 12:28 ` Emanuel Berg
2024-01-25 9:10 ` Po Lu
2024-01-25 11:56 ` Emanuel Berg
2024-01-25 13:21 ` Po Lu
2024-01-25 13:56 ` Emanuel Berg
2024-01-25 23:32 ` Stefan Kangas
2024-01-20 3:39 ` Richard Stallman
2024-01-23 18:10 ` Stefan Monnier via Emacs development discussions.
2024-01-24 4:49 ` JD Smith
2024-01-24 9:45 ` Stefan Kangas
2024-01-24 15:29 ` JD Smith
2024-01-24 15:55 ` Stefan Monnier
2024-01-24 16:02 ` Stefan Monnier
2024-01-24 16:20 ` JD Smith
2024-01-24 17:08 ` Stefan Monnier
2024-01-24 16:35 ` [External] : " Drew Adams
2024-01-24 16:30 ` Drew Adams
2024-02-01 8:56 ` Madhu
2024-02-01 22:46 ` Emanuel Berg
2024-01-25 3:16 ` Madhu
2024-01-25 13:57 ` Stefan Monnier
2024-01-25 15:17 ` JD Smith
2024-01-25 15:37 ` JD Smith
2024-01-25 15:44 ` Alfred M. Szmidt
2024-01-25 16:00 ` JD Smith
2024-01-25 16:05 ` Stefan Monnier
2024-01-25 16:12 ` Alfred M. Szmidt
2024-01-25 16:20 ` Stefan Monnier
2024-01-25 16:33 ` JD Smith
2024-01-29 3:19 ` Richard Stallman
2024-01-26 4:30 ` Richard Stallman
2024-01-28 3:06 ` Stefan Monnier via Emacs development discussions.
2024-01-30 3:59 ` Richard Stallman
2024-01-30 13:02 ` Stefan Monnier
2024-02-23 3:04 ` Richard Stallman
2024-01-26 4:30 ` Richard Stallman
2024-01-28 4:16 ` Stefan Monnier via Emacs development discussions.
2024-01-31 3:32 ` Richard Stallman
2024-01-31 13:20 ` Stefan Monnier
2024-02-03 3:32 ` Richard Stallman
2024-02-03 6:09 ` Stefan Monnier
2024-02-03 6:48 ` Emanuel Berg
2024-02-04 4:46 ` Richard Stallman
2024-02-04 14:04 ` Stefan Monnier
2024-02-04 4:46 ` Richard Stallman
2024-02-04 13:58 ` Stefan Monnier
2024-02-13 0:48 ` Stefan Monnier
2024-02-13 2:27 ` Stefan Monnier
2024-02-14 11:16 ` Richard Stallman
2024-02-14 12:45 ` Stefan Monnier
2024-02-22 3:05 ` Richard Stallman
2024-02-22 4:08 ` Stefan Monnier
2024-02-25 3:14 ` Richard Stallman
2024-02-25 15:03 ` Stefan Monnier
2024-02-29 3:50 ` Richard Stallman [this message]
2024-02-29 18:07 ` Stefan Monnier
2024-02-29 3:50 ` Richard Stallman
2024-02-13 0:41 ` Stefan Monnier
2024-02-23 3:04 ` Richard Stallman
2024-02-23 13:39 ` Stefan Monnier
2024-02-25 3:16 ` Richard Stallman
2024-02-25 14:57 ` Alfred M. Szmidt
2024-02-25 15:38 ` Stefan Monnier
2024-02-25 16:42 ` Alfred M. Szmidt
2024-02-25 17:13 ` Stefan Monnier
2024-02-25 17:22 ` Alan Mackenzie
2024-02-25 17:46 ` Alfred M. Szmidt
2024-02-25 18:13 ` Stefan Monnier
2024-02-25 17:10 ` Stefan Monnier
2024-02-27 3:11 ` Richard Stallman
2024-01-24 12:39 ` Alan Mackenzie
2024-01-24 14:43 ` Emanuel Berg
2024-01-24 16:25 ` Manuel Giraud via Emacs development discussions.
2024-01-25 14:01 ` Code for cond* - cond*-match, cond*-subpat and backtrack-aliases Alan Mackenzie
2024-01-29 3:19 ` Richard Stallman
2024-01-29 8:54 ` Andreas Schwab
2024-01-29 3:19 ` Richard Stallman
2024-01-29 12:16 ` JD Smith
2024-02-01 3:51 ` Richard Stallman
2024-02-01 14:54 ` JD Smith
2024-02-04 4:42 ` Richard Stallman
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