From: "Johan Bockgård" <bojohan@gnu.org>
To: Drew Adams <drew.adams@oracle.com>
Cc: Lars Ingebrigtsen <larsi@gnus.org>,
Paul Eggert <eggert@cs.ucla.edu>,
emacs-devel@gnu.org, Juri Linkov <juri@linkov.net>
Subject: Re: master 71783e9: Add the string-numeric-lessp function
Date: Mon, 07 Mar 2016 22:14:52 +0100 [thread overview]
Message-ID: <87egbmf0s3.fsf@gnu.org> (raw)
In-Reply-To: <5ea313cd-bc7f-4c18-abe3-69bcc4838cbf@default> (Drew Adams's message of "Sun, 6 Mar 2016 18:27:50 -0800 (PST)")
Drew Adams <drew.adams@oracle.com> writes:
> `string-numeric-lessp' really should follow the Emacs
> convention and be called `string-numeric-less-p'.
>
> It's not because `string-less-p' is misnamed that we
> should add to this mistake. `time-less-p' is correctly
> named, for example.
>
> Or else the rule should be clarified to incorporate
> `-lessp' exceptions, so they are within, and not outside,
> the rule.
I think the rule in the Emacs Lisp manual is too simplistic. In practice
we seem to follow something closer to this rule:
By convention, the names of predicates usually end in the letter p
(which stands for ``predicate''). Common Lisp uses a uniform
convention in hyphenating names of predicates. If the name of the
predicate is formed by adding a p to an existing name, such as the
name of a data type, a hyphen is placed before the final p if and
only if there is a hyphen in the existing name. For example, number
begets numberp but standard-char begets standard-char-p. On the other
hand, if the name of a predicate is formed by adding a prefixing
qualifier to the front of an existing predicate name, the two names
are joined with a hyphen and the presence or absence of a hyphen
before the final p is not changed. For example, the predicate
string-lessp has no hyphen before the p because it is the string
version of lessp (a MacLisp function that has been renamed < in
Common Lisp). The name string-less-p would incorrectly imply that it
is a predicate that tests for a kind of object called a string-less,
and the name stringlessp would connote a predicate that tests whether
something has no strings (is ``stringless'')!
from CLTL, https://www.cs.cmu.edu/Groups/AI/html/cltl/clm/node69.html
next prev parent reply other threads:[~2016-03-07 21:14 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20160221043348.25201.81719@vcs.savannah.gnu.org>
[not found] ` <E1aXLiO-0006ZB-4R@vcs.savannah.gnu.org>
2016-02-21 4:43 ` master 71783e9: Add the string-numeric-lessp function Lars Ingebrigtsen
2016-02-21 5:36 ` Lars Ingebrigtsen
2016-02-21 6:15 ` Stephan Mueller
2016-02-21 10:02 ` Lars Ingebrigtsen
2016-02-21 19:35 ` Yuri Khan
2016-02-22 2:51 ` Lars Ingebrigtsen
2016-02-22 17:59 ` Richard Stallman
2016-02-21 21:30 ` Paul Eggert
2016-02-22 1:32 ` Andy Moreton
2016-02-22 4:01 ` Paul Eggert
2016-02-22 16:11 ` Eli Zaretskii
2016-02-22 2:53 ` Lars Ingebrigtsen
2016-02-22 3:50 ` Paul Eggert
2016-02-22 4:00 ` Lars Ingebrigtsen
2016-02-22 4:16 ` Paul Eggert
2016-02-22 4:22 ` Lars Ingebrigtsen
2016-02-22 5:56 ` Paul Eggert
2016-03-07 0:16 ` Juri Linkov
2016-03-07 0:53 ` Paul Eggert
2016-03-07 17:45 ` Richard Stallman
2016-03-07 17:49 ` Lars Magne Ingebrigtsen
2016-03-07 23:55 ` Juri Linkov
2016-03-07 23:52 ` Juri Linkov
2016-03-08 2:06 ` Paul Eggert
2016-03-08 9:26 ` Andreas Schwab
2016-03-09 9:26 ` Paul Eggert
2016-03-07 2:27 ` Drew Adams
2016-03-07 21:14 ` Johan Bockgård [this message]
2016-03-07 22:03 ` Drew Adams
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