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Re: master 71783e9: Add the string-numeric-lessp function
From: |
Johan Bockgård |
Subject: |
Re: master 71783e9: Add the string-numeric-lessp function |
Date: |
Mon, 07 Mar 2016 22:14:52 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) |
Drew Adams <address@hidden> 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
RE: master 71783e9: Add the string-numeric-lessp function, Drew Adams, 2016/03/06
- Re: master 71783e9: Add the string-numeric-lessp function,
Johan Bockgård <=