2008-02-21 04:00:22 +00:00
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-*-mode: text; coding: latin-1;-*-
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2013-01-01 09:11:05 +00:00
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Copyright (C) 2002-2013 Free Software Foundation, Inc.
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2008-02-21 04:00:22 +00:00
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See the end of the file for license conditions.
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Problems, fixmes and other unicode-related issues
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-------------------------------------------------------------
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Notes by fx to record various things of variable importance. handa
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needs to check them -- don't take too seriously, especially with
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regard to completeness.
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* SINGLE_BYTE_CHAR_P returns true for Latin-1 characters, which has
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undesirable effects. E.g.:
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(multibyte-string-p (let ((s "x")) (aset s 0 ?<3F>) s)) => nil
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(multibyte-string-p (concat [?<3F>])) => nil
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(text-char-description ?<3F>) => "M-#"
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These examples are all fixed by the change of 2002-10-14, but
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there still exist questionable SINGLE_BYTE_CHAR_P in the
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code (keymap.c and print.c).
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* Rationalize character syntax and its relationship to the Unicode
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database. (Applies mainly to symbol an punctuation syntax.)
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* Fontset handling and customization needs work. We want to relate
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fonts to scripts, probably based on the Unicode blocks. The
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presence of small-repertoire 10646-encoded fonts in XFree 4 is a
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pain, not currently worked round.
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With the change on 2002-07-26, multiple fonts can be
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specified in a fontset for a specific range of characters.
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Each range can also be specified by script. Before using
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ISO10646 fonts, Emacs checks their repertories to avoid such
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fonts that don't have a glyph for a specific character.
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fx has worked on fontset customization, but was stymied by
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basic problems with the way the default face is dealt with
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(and something else, I think). This needs revisiting.
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* Work is also needed on charset and coding system priorities.
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* The relevant bits of latin1-disp.el need porting (and probably
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re-naming/updating). See also cyril-util.el.
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* Quail files need more work now the encoding is largely irrelevant.
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* What to do with the old coding categories stuff?
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* The preferred-coding-system property of charsets should probably be
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junked unless it can be made more useful now.
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* find-multibyte-characters needs looking at.
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* Implement Korean cp949/UHC, BIG5-HKSCS and any other important missing
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charsets.
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* Lazy-load tables for unify-charset somehow?
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Actually, Emacs clears out all charset maps and unify-map just
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before dumping, and they are loaded again on demand by the
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dumped emacs. But, those maps (char tables) generated while
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temacs is running can't be removed from the dumped emacs.
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* iso-2022 charsets get unified on i/o.
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With the change on 2003-01-06, decoding routines put `charset'
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property to decoded text, and iso-2022 encoder pay attention
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to it. Thus, for instance, reading and writing by
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iso-2022-7bit preserve the original designation sequences.
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The property name `preferred-charset' may be better?
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We may have to utilize this property to decide a font.
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* Revisit locale processing: look at treating the language and
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charset parts separately. (Language should affect things like
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spelling and calendar, but that's not a Unicode issue.)
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* Handle Unicode combining characters usefully, e.g. diacritics, and
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handle more scripts specifically (<28> la Devanagari). There are
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issues with canonicalization.
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* We need tabular input methods, e.g. for maths symbols. (Not
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specific to Unicode.)
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* Need multibyte text in menus, e.g. for the above. (Not specific to
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Unicode -- see Emacs etc/TODO, but now mostly works with gtk.)
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* There's currently no support for Unicode normalization.
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* Populate char-width-table correctly for Unicode characters and
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worry about what happens when double-width charsets covering
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non-CJK characters are unified.
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* There are type errors lurking, e.g. in
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Fcheck_coding_systems_region. Define ENABLE_CHECKING to find them.
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* Old auto-save files, and similar files, such as Gnus drafts,
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containing non-ASCII characters probably won't be re-read correctly.
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This file is part of GNU Emacs.
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2008-05-09 23:48:10 +00:00
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GNU Emacs is free software: you can redistribute it and/or modify
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2008-02-21 04:00:22 +00:00
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it under the terms of the GNU General Public License as published by
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2008-05-09 23:48:10 +00:00
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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2008-02-21 04:00:22 +00:00
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GNU Emacs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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2008-05-09 23:48:10 +00:00
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along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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