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Fix the paragraph describing the limitation of

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UTF-8/16/7.
This commit is contained in:
Kenichi Handa 2005-09-15 02:55:22 +00:00
parent 503ac8a45f
commit ce9b56fe13
2 changed files with 15 additions and 10 deletions
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5
etc/ChangeLog
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@ -1,3 +1,8 @@
2005-09-15 Kenichi Handa <handa@m17n.org>
* PROBLEMS: Fix the paragraph describing the limitation of
UTF-8/16/7.
2005-09-14 Romain Francoise <romain@orebokech.com>
* NEWS: Add entry for write-region-inhibit-fsync.

20
etc/PROBLEMS
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@ -841,9 +841,16 @@ mule-unicode-0100-24ff:-gnu-unifont-*-iso10646-1
** The UTF-8/16/7 coding systems don't encode CJK (Far Eastern) characters.
Emacs by default only supports the parts of the Unicode BMP whose code
points are in the ranges 0000-33ff and e000-ffff. This excludes: most
of CJK, Yi and Hangul, as well as everything outside the BMP.
Emacs directly supports the Unicode BMP whose code points are in the
ranges 0000-33ff and e000-ffff, and indirectly supports the parts of
CJK characters belonging to these legacy charsets:
GB2312, Big5, JISX0208, JISX0212, JISX0213-1, JISX0213-2, KSC5601
The latter support is done in Utf-Translate-Cjk mode (turned on by
default). Which Unicode CJK characters are decoded into which Emacs
charset is decided by the current language environment. For instance,
in Chinese-GB, most of them are decoded into chinese-gb2312.
If you read UTF-8 data with code points outside these ranges, the
characters appear in the buffer as raw bytes of the original UTF-8
@ -853,13 +860,6 @@ If you read such characters from UTF-16 or UTF-7 data, they are
substituted with the Unicode `replacement character', and you lose
information.
To edit such UTF data, turn on Utf-Translate-Cjk mode, which makes
many common CJK characters available for encoding and decoding and can
be extended by updating the tables it uses. This also allows you to
save as UTF buffers containing characters decoded by the chinese-,
japanese- and korean- coding systems, e.g. cut and pasted from
elsewhere.
** Mule-UCS loads very slowly.
Changes to Emacs internals interact badly with Mule-UCS's `un-define'