From: Eli Zaretskii <eliz@gnu.org>
To: Kenichi Handa <handa@m17n.org>
Cc: emacs-devel@gnu.org
Subject: Re: Emacs 23 character code space
Date: Wed, 26 Nov 2008 22:26:03 +0200 [thread overview]
Message-ID: <uhc5ugrok.fsf@gnu.org> (raw)
In-Reply-To: <E1L5CTq-0006z0-U0@etlken.m17n.org>
> From: Kenichi Handa <handa@m17n.org>
> CC: eliz@gnu.org, emacs-devel@gnu.org
> Date: Wed, 26 Nov 2008 13:58:26 +0900
>
> I'll explain it a little bit more. To decode a character
> sequence to a byte sequence, Emacs actually does two kinds
> of decoding as below:
>
> (1) (2)
> characters <-----> (charset code-point) pairs <-----> bytes
Can you give a couple of examples, for some popular charsets, and how
we decode bytes into characters thru these pairs of charsets and code
points?
> For the decoding of (1), Emacs uses infomaiton of coding
> system to decide which charset to use, and then uses
> informaiton of the selected charset to get a code point.
>
> For the decoding of (2) Emacs uses only information of
> coding system.
Thanks. What confuses me is that, roughly, there's a charset in Emacs
23 for every coding-system, and they both have almost identical names.
For example, the code point of a-umlaut in the iso-8859-1 charset is
exactly identical to the byte value produced by encoding that
character with iso-8859-1 coding-system. So I wonder why we need
both in Emacs. Why can't we, for example, decode bytes directly into
Emacs characters?
next prev parent reply other threads:[~2008-11-26 20:26 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-01 14:20 Emacs 23 character code space Eli Zaretskii
2008-11-01 16:46 ` Eli Zaretskii
2008-11-03 1:34 ` Kenichi Handa
2008-11-03 12:45 ` Kenichi Handa
2008-11-03 20:13 ` Eli Zaretskii
2008-11-04 7:35 ` Kenichi Handa
2008-11-04 20:19 ` Eli Zaretskii
2008-11-05 12:27 ` Kenichi Handa
2008-11-05 18:23 ` Eli Zaretskii
2008-11-22 18:25 ` Eli Zaretskii
2008-11-26 1:41 ` Kenichi Handa
2008-11-26 4:13 ` Eli Zaretskii
2008-11-26 4:24 ` Kenichi Handa
2008-11-26 4:58 ` Kenichi Handa
2008-11-26 20:26 ` Eli Zaretskii [this message]
2008-11-26 22:52 ` Juanma Barranquero
2008-11-27 1:10 ` Stephen J. Turnbull
2008-11-27 1:35 ` Kenichi Handa
2008-11-26 20:18 ` Eli Zaretskii
2008-11-27 1:29 ` Kenichi Handa
2008-11-29 17:12 ` Eli Zaretskii
2008-12-02 5:40 ` Kenichi Handa
2008-11-28 13:19 ` Eli Zaretskii
2008-12-02 5:44 ` Kenichi Handa
2008-12-02 19:40 ` Eli Zaretskii
2008-11-29 12:01 ` Eli Zaretskii
2008-11-22 16:28 ` Eli Zaretskii
2008-11-23 4:16 ` Stefan Monnier
2008-11-23 11:22 ` Eli Zaretskii
2008-11-26 1:51 ` Kenichi Handa
2008-11-23 8:29 ` Ulrich Mueller
2008-11-23 11:11 ` Eli Zaretskii
2008-11-23 11:55 ` Ulrich Mueller
2008-11-24 3:06 ` Stefan Monnier
2008-11-26 1:31 ` Kenichi Handa
2008-11-22 17:03 ` New function: what-file-line, used when writing gdb script richardeng
2008-11-07 7:21 ` Emacs 23 character code space Kenichi Handa
2008-11-07 10:27 ` Eli Zaretskii
2008-11-07 11:52 ` Kenichi Handa
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