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From: Kenichi Handa <handa@m17n.org>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: lekktu@gmail.com, emacs-devel@gnu.org, rms@gnu.org, jasonr@gnu.org
Subject: Re: kbd vs read-key-sequence
Date: Tue, 13 Mar 2007 10:17:10 +0900	[thread overview]
Message-ID: <E1HQvdW-0007G3-Ie@etlken.m17n.org> (raw)
In-Reply-To: <jwvk5xmv6sm.fsf-monnier+emacs@gnu.org> (message from Stefan Monnier on Mon, 12 Mar 2007 11:19:19 -0400)

I'm very sorry to being late to join this thread.

In article <jwvk5xmv6sm.fsf-monnier+emacs@gnu.org>, Stefan Monnier <monnier@iro.umontreal.ca> writes:

> >     Because the way the event is decoded through read-key-sequence is not
> >     necessarily the same.  E.g. while ?<encoded-?> may get turned into ??, it
> >     may be the case that ?\M-<encoded-?> stays unchanged.

> > How does that happen?

> See the OP.  It seems that encoded-kb.el has such a limitation (it should
> probably be considered as a bug, but there may be good reasons for it,
> I don't know).

At first, encoded-kbd-mode is designed to be used in the
case that Emacs is invoked with -nw, and it uses
key-translation-map to handle character events from 0 to 255
(that's all what happens with -nw).

I think the following diagram is the right thing to do:

       window-system        terminal
             |                 |
             | window event    | character event 0..255
             |                 |
       handle_one_xevent    keyboad-coding-system decoder
              \               /
               \ lispy event /
                \           /
                 \         /              
                  read_char 
                      |
                 input method   
                      |
                   keymap

And, it's in my todo list to abolish encoded-kbd-mode and
implement keyboard-coding-system decoder in C for long, but
unfortunately I still don't have a time to do that.

> > Maybe that is a bug; if so, we should fix it.

> That's what this thread is about supposedly.

> > We could recommend that people write (meta ?<encoded-?>).
> > That would eliminate this particular problem, right?

> No.  It would make it work on those systems which have the bug (e.g. w32
> right now), but would not work on systems where read-key-sequence correctly
> decodes such a key-combination into ?\M-é.

As shown in the previous diagram, I think it's a bug of w32
code if it doesn't convert such an event as ?\M-<encoded-?>
into ?\M-é because only a window system generates such an
event and knows how to encode it.

> > These do not make things perfect, but I think they might be enough
> > to enable users to get reliable results.  What do you think?

> I don't think it'll really be reliable, but we can definitely provide
> guidelines and hints.

One guideline is not to use encoded-kbd-mode on window
system.

---
Kenichi Handa
handa@m17n.org

  reply	other threads:[~2007-03-13  1:17 UTC|newest]

Thread overview: 97+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-28 22:27 kbd vs read-key-sequence Juanma Barranquero
2007-02-28 22:40 ` Andreas Schwab
2007-02-28 22:50   ` Lennart Borgman (gmail)
2007-02-28 23:32   ` Juanma Barranquero
2007-03-01  1:35     ` Juanma Barranquero
2007-03-01  5:28       ` Stefan Monnier
2007-03-01 12:48         ` Juanma Barranquero
2007-03-01 15:32           ` Stefan Monnier
2007-03-01 17:30             ` Juanma Barranquero
2007-03-01 23:23               ` Stefan Monnier
2007-03-01 23:53                 ` Juanma Barranquero
2007-03-02  0:03                   ` Juanma Barranquero
2007-03-02  9:09                     ` Jason Rumney
2007-03-02  9:48                       ` Juanma Barranquero
2007-03-02 16:47                   ` Stefan Monnier
2007-03-02 17:29                     ` Juanma Barranquero
2007-03-02 17:57                       ` Jason Rumney
2007-03-02 18:15                         ` Juanma Barranquero
2007-03-02 18:20                           ` David Kastrup
2007-03-02 21:03                           ` Stefan Monnier
2007-03-03  0:31                             ` Juanma Barranquero
2007-03-03 22:13                             ` Richard Stallman
2007-03-03 23:01                               ` Stefan Monnier
2007-03-05  2:55                                 ` Richard Stallman
2007-03-05 17:10                                   ` Stefan Monnier
2007-03-11 20:01                                     ` Richard Stallman
2007-03-12 15:19                                       ` Stefan Monnier
2007-03-13  1:17                                         ` Kenichi Handa [this message]
2007-03-13  3:12                                           ` Stefan Monnier
2007-03-13  4:06                                             ` Kenichi Handa
2007-03-13 14:47                                               ` Stefan Monnier
2007-03-19  5:14                                           ` Richard Stallman
2007-03-19 12:25                                             ` Kenichi Handa
2007-03-19 14:19                                               ` Kim F. Storm
2007-03-26  3:52                                               ` Richard Stallman
2007-03-26  7:22                                                 ` Kenichi Handa
2007-03-26 23:14                                                   ` Richard Stallman
2007-03-27  0:30                                                     ` Kenichi Handa
2007-03-27 16:42                                                       ` Richard Stallman
2007-03-28  0:29                                                         ` Kenichi Handa
2007-03-29 15:32                                                           ` Richard Stallman
2007-03-29 16:11                                                             ` Stefan Monnier
2007-03-30 21:23                                                               ` Richard Stallman
2007-03-31  0:38                                                                 ` Stefan Monnier
2007-03-31 10:07                                                                   ` Eli Zaretskii
2007-03-31 23:20                                                                     ` Richard Stallman
2007-04-01  3:09                                                                       ` Eli Zaretskii
2007-04-01 13:59                                                                         ` Richard Stallman
2007-04-01 19:14                                                                           ` Stefan Monnier
2007-04-01 20:18                                                                             ` Jason Rumney
2007-04-01 20:35                                                                               ` Stefan Monnier
2007-04-02 12:00                                                                                 ` Eli Zaretskii
2007-04-02  2:27                                                                               ` Kenichi Handa
2007-04-02 11:58                                                                                 ` Eli Zaretskii
2007-04-02 12:31                                                                                   ` Kenichi Handa
2007-04-02 12:46                                                                                     ` Eli Zaretskii
2007-04-02 14:33                                                                                       ` Stefan Monnier
2007-04-02 16:14                                                                                     ` Jason Rumney
2007-04-02 23:24                                                                                       ` Davis Herring
2007-04-03  6:58                                                                                         ` Jason Rumney
2007-04-03  7:46                                                                                       ` Richard Stallman
2007-04-03  8:42                                                                                         ` Eli Zaretskii
2007-04-03 14:58                                                                                           ` Stefan Monnier
2007-04-03 15:34                                                                                             ` Eli Zaretskii
2007-04-03 17:59                                                                                               ` Stefan Monnier
2007-04-03 18:20                                                                                                 ` Eli Zaretskii
2007-04-03 18:33                                                                                                   ` Stefan Monnier
2007-04-04 14:02                                                                                                 ` Richard Stallman
2007-04-04 14:02                                                                                             ` Richard Stallman
2007-04-03  9:05                                                                                         ` Jason Rumney
2007-04-03  9:37                                                                                           ` Eli Zaretskii
2007-04-03 10:24                                                                                             ` Jason Rumney
2007-04-04 14:02                                                                                           ` Richard Stallman
2007-04-03 10:12                                                                                       ` Eli Zaretskii
2007-04-04 14:02                                                                                         ` Richard Stallman
2007-04-04 18:03                                                                                           ` Eli Zaretskii
2007-03-31 20:42                                                                   ` Richard Stallman
2007-03-31 21:44                                                                     ` Eli Zaretskii
2007-03-31 22:06                                                                       ` Juanma Barranquero
2007-03-30  0:47                                                             ` Kenichi Handa
2007-03-30  3:25                                                               ` Stefan Monnier
2007-03-31 10:03                                                                 ` Eli Zaretskii
2007-03-31 20:27                                                                   ` Stefan Monnier
2007-03-30 21:22                                                               ` Richard Stallman
2007-03-31 10:02                                                               ` Eli Zaretskii
2007-03-19  5:14                                         ` Richard Stallman
2007-03-26 23:14                                         ` Richard Stallman
2007-03-28  0:57                                           ` Stefan Monnier
2007-03-28 16:09                                             ` Richard Stallman
2007-03-28 19:52                                               ` Stefan Monnier
2007-03-29 17:59                                                 ` Richard Stallman
2007-03-30 23:47                                               ` Chong Yidong
2007-03-31  9:08                                                 ` Eli Zaretskii
2007-03-03 22:13                           ` Richard Stallman
2007-03-02 18:21                         ` Juanma Barranquero
2007-03-02 19:04                           ` Jason Rumney
2007-03-03 10:39                       ` Eli Zaretskii

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