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: Sat, 22 Nov 2008 20:25:52 +0200 [thread overview]
Message-ID: <uiqqfipn3.fsf@gnu.org> (raw)
In-Reply-To: <E1KxhUI-0005VH-CR@etlken.m17n.org>
> From: Kenichi Handa <handa@m17n.org>
> CC: emacs-devel@gnu.org
> Date: Wed, 05 Nov 2008 21:27:54 +0900
>
> Attached is the remaining part. Please reflect that to the
> document.
Thanks. I have a few questions about this:
A character set is a set of characters, and it assigns a unique code
point to each character belonging to the set. Emacs decodes a
specific code point of a specific character set to an Emacs character.
Does this mean a character set is equivalent to a coding-system,
meaning that a coding-system is a mapping between a character set and
the Emacs internal codepoints?
@defun charset-dimension charset
This function returns the dimension of @var{charset}. Here, dimension
means the number of bytes required to represent the highest code point
(not an Emacs character code) of a character. For example, the
dimension of @code{iso-8859-1} is one, the dimension of
@code{japanese-jisx0208} is two, and the dimension of @code{unicode}
is three.
@end defun
I decided not to document this. I think the concept of charset
dimension is too obscure to explain, and not really needed for Lisp
programs, unless they need to define a new charset, or display a
charset, and those are already done by Emacs infrastructure. Do you
see any problems with not documenting this function?
A translation table has two extra slots. The first is either
@code{nil} or a translation table that performs the reverse
translation; the second is the maximum number of characters to look up
for translation.
Could you please elaborate on the second extra slot: when and for what
purpose would there be a need to look up characters for translation?
TIA
next prev parent reply other threads:[~2008-11-22 18:25 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 [this message]
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
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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