GNU bug report logs - #49214
dabbrev-expand vs. ： vs. :

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
To: bug-gnu-emacs <at> gnu.org
Subject: dabbrev-expand vs. ： vs. :
Date: Fri, 25 Jun 2021 03:31:34 +0800

Unfair! dabbrev-expand only expands boys names
1. 名：laura <at> nurdsboro.org
2. 名:ralph <at> nurdsboro.org
... when girls are behind wider colons.
Try it:
l M-/
r M-/

Message #8 received at 49214 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
Cc: 49214 <at> debbugs.gnu.org
Subject: Re: bug#49214: dabbrev-expand vs. ： vs. :
Date: Thu, 24 Jun 2021 21:43:52 +0200

積丹尼 Dan Jacobson <jidanni <at> jidanni.org> writes:

> 1. 名：laura <at> nurdsboro.org
> 2. 名:ralph <at> nurdsboro.org

The problem here is:

(string-match "^\\sw" "：foo")
0

(string-match "^\\sw" ":foo")
nil

That is, ： is word-constituent.  I'm not sure whether it's reasonable
for dabbrev to use \\sw as the regexp here, but it can be controlled by
setting `dabbrev-abbrev-char-regexp' to something else.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #11 received at 49214 <at> debbugs.gnu.org (full text, mbox):

From: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 49214 <at> debbugs.gnu.org
Subject: Re: bug#49214: dabbrev-expand vs. ： vs. :
Date: Fri, 25 Jun 2021 04:23:23 +0800

Why are wide punctuation any less punctuation than narrow punctuation?
Sounds like a Euro-centered view of the world.

Why can't all punctuation be treated the same, narrow or wide?

LI> That is, ： is word-constituent.  I'm not sure whether it's reasonable
LI> for dabbrev to use \\sw as the regexp here, but it can be controlled by
LI> setting `dabbrev-abbrev-char-regexp' to something else.

Message #16 received at 49214-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
Cc: larsi <at> gnus.org, 49214-done <at> debbugs.gnu.org
Subject: Re: bug#49214: dabbrev-expand vs. ： vs. :
Date: Fri, 25 Jun 2021 08:43:19 +0300

> From: 積丹尼 Dan Jacobson
>  <jidanni <at> jidanni.org>
> Date: Fri, 25 Jun 2021 04:23:23 +0800
> Cc: 49214 <at> debbugs.gnu.org
> 
> Why are wide punctuation any less punctuation than narrow punctuation?

Some wide punctuation characters are treated specially due to their
Word Break properties.  The details are in the comments where we
define text-mode-syntax-table, and in the Unicode Standard Annex 29
referenced from there.  It's just that there was a bug there.

> Sounds like a Euro-centered view of the world.

That's a nasty accusation which has no basis whatsoever.  Please don't
do that again here, ever.

> Why can't all punctuation be treated the same, narrow or wide?

It was a bug, plain and simple.  Now fixed on the master branch.

Message #19 received at 49214 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 49214 <at> debbugs.gnu.org, jidanni <at> jidanni.org
Subject: Re: bug#49214: dabbrev-expand vs. ： vs. :
Date: Fri, 25 Jun 2021 08:44:21 +0300

> From: Lars Ingebrigtsen <larsi <at> gnus.org>
> Date: Thu, 24 Jun 2021 21:43:52 +0200
> Cc: 49214 <at> debbugs.gnu.org
> 
> That is, ： is word-constituent.  I'm not sure whether it's reasonable
> for dabbrev to use \\sw as the regexp here

Why not?  dabbrev-expand expands words, not any arbitrary sequences of
characters.

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