bug#5193: 23.1; single-key-description problem

bug#5193: 23.1; single-key-description problem

[Drew Adams]

[-- Attachment #1: Type: text/plain, Size: 516 bytes --]

emacs -Q
 
The character range (128 . 4194303) is bound to `self-insert-command'.
 
(single-key-description 128) gives "\200"
(single-key-description 4194303) gives "\377"
 
However, in the former case, "\200" is a string with one character,
\200. In the latter case, "\377" is a string with four characters, \,
3, 7, and 7.
 
In GNU Emacs 23.1.1 (i386-mingw-nt5.1.2600)
 of 2009-07-29 on SOFT-MJASON
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (4.4)'
 
 

[-- Attachment #2: Type: text/html, Size: 1288 bytes --]

bug#5193: 23.1; single-key-description problem

[Lars Magne Ingebrigtsen]

"Drew Adams" <drew.adams@oracle.com> writes:

> The character range (128 . 4194303) is bound to `self-insert-command'.
>  
> (single-key-description 128) gives "\200"
> (single-key-description 4194303) gives "\377"
>  
> However, in the former case, "\200" is a string with one character,
> \200. In the latter case, "\377" is a string with four characters, \,
> 3, 7, and 7.

Something seems to have changed here:

(single-key-description 128) => "€"
(single-key-description 4194303) => "\301\277"

But it's essentially still the same -- the 128 is a string of one
character, and the other one is a string of 8 characters.

I have no idea whether this is a bug or a feature, though.

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

bug#5193: 23.1; single-key-description problem

[Stefan Monnier]

>> The character range (128 . 4194303) is bound to `self-insert-command'.
>> (single-key-description 128) gives "\200"
>> (single-key-description 4194303) gives "\377"
>> However, in the former case, "\200" is a string with one character,
>> \200. In the latter case, "\377" is a string with four characters, \,
>> 3, 7, and 7.
> Something seems to have changed here:
> (single-key-description 128) => "€"

This change is just the result of the switch from emacs-mule in
Emacs-22 to emacs-unicode in Emacs≥23 (i.e. 128 doesn't mean the same
char any more).

> (single-key-description 4194303) => "\301\277"
> But it's essentially still the same -- the 128 is a string of one
> character, and the other one is a string of 8 characters.
> I have no idea whether this is a bug or a feature, though.

Showing the internal representation of byte characters is clearly a bug.
I.e. (single-key-description 4194303) could/should return something like
"\377" either as a single char or as 4 chars.


        Stefan

bug#5193: 23.1; single-key-description problem

[Andreas Schwab]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

> Showing the internal representation of byte characters is clearly a bug.

Fixed on emacs-23.

> I.e. (single-key-description 4194303) could/should return something like
> "\377" either as a single char or as 4 chars.

The four char form is just the print representation and has nothing to
do with single-key-description.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."