From: Eli Zaretskii <eliz@gnu.org>
To: Drew Adams <drew.adams@oracle.com>
Cc: cyd@gnu.org, 12054@debbugs.gnu.org
Subject: bug#12054: 24.1; regression? font-lock no-break-space with nil nobreak-char-display
Date: Sat, 03 Nov 2012 22:57:36 +0200 [thread overview]
Message-ID: <83sj8q4d6n.fsf@gnu.org> (raw)
In-Reply-To: <124464DE2A8F4248A1F0C156E00E815D@us.oracle.com>
> From: "Drew Adams" <drew.adams@oracle.com>
> Cc: <cyd@gnu.org>, <12054@debbugs.gnu.org>
> Date: Sat, 3 Nov 2012 10:22:59 -0700
>
> > > Just why is it that the regexp "[\240]+" does not match this char?
> >
> > Because, for histerical reasons, 'insert' treats strings such as
> > "\nnn" as unibyte strings.
>
> Sorry, I don't understand your point. My question was about the regexp (not)
> matching, not about (not) being able to insert the char.
It doesn't matter. "\nnn" in a string is still interpreted as unibyte.
> I don't see a problem with inserting the char. As I said, the correct char gets
> inserted AFAICT, as shown both by `C-u C-x =' and by Yidong's correction of the
> font-lock regexp.
Insertion with C-q does something different.
> > It's an unfortunate dark corner, due to the ambiguity of what \240
> > really means in a string.
>
> That just makes it darker for me. Can you please elaborate?
\240 could be taken as NBPS or as a literal byte. They have different
representations in Emacs and are treated differently, but are
identical numerically outside of Emacs.
> 3. Why not? Why turn it around and speak of "need" to use it?
> The real question is why _not_ be able to use octal syntax here?
For the same reason you'd use ?a and not \141: it's more clear to the
human reader.
Using octal escapes for non-ASCII characters in Emacs is deprecated
and dangerous. You just bumped into one danger; there are more. I
suggest you avoid this notation as much as you can.
next prev parent reply other threads:[~2012-11-03 20:57 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-26 5:43 bug#12054: 24.1; regression? font-lock no-break-space with nil nobreak-char-display Drew Adams
2012-09-16 23:40 ` Drew Adams
2012-11-03 10:50 ` Chong Yidong
2012-11-03 11:03 ` Chong Yidong
2012-11-03 16:25 ` Drew Adams
2012-11-03 16:56 ` Eli Zaretskii
2012-11-03 17:22 ` Drew Adams
2012-11-03 20:57 ` Eli Zaretskii [this message]
2012-11-03 19:50 ` Stefan Monnier
2012-11-03 20:02 ` Drew Adams
2012-11-03 20:36 ` Stefan Monnier
2012-11-03 20:42 ` Drew Adams
2012-11-03 17:06 ` Chong Yidong
2012-11-03 17:32 ` Drew Adams
2012-11-03 18:00 ` Chong Yidong
2012-11-03 18:04 ` Drew Adams
2012-11-03 21:00 ` Eli Zaretskii
2012-11-03 19:01 ` Drew Adams
2012-11-03 21:13 ` Eli Zaretskii
2012-11-04 23:34 ` Drew Adams
2012-11-03 16:37 ` Andreas Schwab
2012-11-03 17:05 ` Drew Adams
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