From: Sam Steingold <sds@gnu.org>
To: emacs-devel@gnu.org, Roland Winkler <winkler@gnu.org>
Subject: Re: case-insensitive string comparison
Date: Tue, 19 Jul 2022 18:47:14 -0400 [thread overview]
Message-ID: <lzmtd4u3d9.fsf@3c22fb11fdab.ant.amazon.com> (raw)
In-Reply-To: <87ilnsq4cr.fsf@gnu.org> (Roland Winkler's message of "Tue, 19 Jul 2022 14:39:32 -0500")
> * Roland Winkler <jvaxyre@tah.bet> [2022-07-19 14:39:32 -0500]:
>
> On Tue, Jul 19 2022, Sam Steingold wrote:
>> Specifically, I would like to add
>>
>> (defun string-equal-ignore-case (s1 s2)
>> "Like `string-equal', but case-insensitive.
>> Upper-case and lower-case letters are treated as equal.
>> Unibyte strings are converted to multibyte for comparison."
>> (eq t (compare-strings s1 0 nil s2 0 nil t)))
>>
>> to subr.el next to `string-prefix-p' - is this okay?
>
> I have run into this problem fairly often that I needed case-insensitive
> string comparison, and I believe various elisp packages include a
> "private" version of the above. I always felt that
> `(eq t (compare-strings s1 0 nil s2 0 nil t))' was a crutch for this
> common problem. Would it make sense to give the built-in function
> string-equal an optional arg ignore-case?
No, because I need to be able to pass `string-equal-ignore-case' to
things like `cl-find' as `:test' &c.
Also, if you look at fns.c, `string-equal' is basically `memcmp', while
`compare-strings' is way more complex.
PS. Actually, compare-strings/ignore_case is broken because it does,
essentially, upcase both arguments, see https://stackoverflow.com/q/319426/850781
--
Sam Steingold (http://sds.podval.org/) on darwin Ns 10.3.2113
http://childpsy.net http://calmchildstories.com http://steingoldpsychology.com
https://memri.org https://www.dhimmitude.org http://think-israel.org
A poet who reads his verse in public may have other nasty habits.
next prev parent reply other threads:[~2022-07-19 22:47 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-19 17:27 case-insensitive string comparison Sam Steingold
2022-07-19 18:06 ` Mattias Engdegård
2022-07-19 18:56 ` Sam Steingold
2022-07-20 4:39 ` tomas
2022-07-20 11:35 ` Eli Zaretskii
2022-07-20 13:30 ` tomas
2022-07-19 18:16 ` Stefan Kangas
2022-07-19 19:39 ` Roland Winkler
2022-07-19 22:47 ` Sam Steingold [this message]
2022-07-20 2:21 ` Roland Winkler
2022-07-20 3:01 ` Stefan Monnier
2022-07-20 16:22 ` Sam Steingold
2022-07-25 14:23 ` Sam Steingold
2022-07-25 15:58 ` Eli Zaretskii
2022-07-25 19:39 ` Sam Steingold
2022-07-26 13:05 ` Eli Zaretskii
2022-07-26 14:16 ` Sam Steingold
2022-07-26 15:53 ` Eli Zaretskii
2022-07-26 16:00 ` Sam Steingold
2022-07-26 16:16 ` Lars Ingebrigtsen
2022-07-26 14:43 ` Robert Pluim
2022-07-25 19:37 ` Bruno Haible
2022-07-26 3:24 ` Richard Stallman
2022-07-26 8:00 ` Helmut Eller
2022-07-26 12:21 ` Eli Zaretskii
2022-07-27 2:58 ` Richard Stallman
2022-07-31 8:24 ` Eli Zaretskii
2022-07-26 14:28 ` Sam Steingold
2022-07-26 15:42 ` Sam Steingold
2022-07-26 16:10 ` Eli Zaretskii
2022-07-26 18:56 ` Bruno Haible
2022-07-26 19:30 ` Eli Zaretskii
2022-07-20 16:24 ` Roland Winkler
2022-07-20 17:06 ` Sam Steingold
2022-07-20 17:16 ` Eli Zaretskii
2022-07-20 17:12 ` Eli Zaretskii
2022-07-20 17:37 ` Roland Winkler
2022-07-20 17:50 ` Eli Zaretskii
2022-07-20 18:10 ` Roland Winkler
2022-07-20 18:16 ` Eli Zaretskii
2022-07-20 18:18 ` [External] : " Drew Adams
2022-07-21 6:56 ` Eli Zaretskii
2022-07-21 14:19 ` Roland Winkler
2022-07-21 15:53 ` Eli Zaretskii
2022-07-21 16:35 ` Roland Winkler
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