1 -*-mode: text; coding: utf-8;-*-
3 Copyright (C) 2002-2016 Free Software Foundation, Inc.
4 See the end of the file for license conditions.
6 Importing a new Unicode Standard version into Emacs
7 -------------------------------------------------------------
9 Emacs uses the following files from the Unicode Character Database
16 First, these files need to be copied into admin/unidata/, and then
17 Emacs should be rebuilt for them to take effect. Rebuilding Emacs
18 updates several derived files elsewhere in the Emacs source tree,
19 mainly in lisp/international/.
21 When Emacs is rebuilt for the first time after importing the new
22 files, pay attention to any warning or error messages. In particular,
23 admin/unidata/unidata-gen.el will complain if UnicodeData.txt defines
24 new bidirectional attributes of characters, because unidata-gen.el,
25 bidi.c and dispextern.h need to be updated in that case; failure to do
26 so will cause aborts in redisplay.
28 Next, review the changes in UnicodeData.txt vs the previous version
29 used by Emacs. Any changes, be it introduction of new scripts or
30 addition of codepoints to existing scripts, might need corresponding
31 changes in the data used for filling the category-table, case-table,
32 and char-width-table. The additional scripts should cause automatic
33 updates in charscript.el, but it is a good idea to look at the results
34 and see if any changes in admin/unidata/blocks.awk are required.
36 Any new scripts added by UnicodeData.txt will also need updates to
37 script-representative-chars defined in fontset.el. Other databases in
38 fontset.el might also need to be updated as needed.
40 Problems, fixmes and other unicode-related issues
41 -------------------------------------------------------------
43 Notes by fx to record various things of variable importance. Handa
44 needs to check them -- don't take too seriously, especially with
45 regard to completeness.
47 * SINGLE_BYTE_CHAR_P returns true for Latin-1 characters, which has
48 undesirable effects. E.g.:
49 (multibyte-string-p (let ((s "x")) (aset s 0 ?£) s)) => nil
50 (multibyte-string-p (concat [?£])) => nil
51 (text-char-description ?£) => "M-#"
53 These examples are all fixed by the change of 2002-10-14, but
54 there still exist questionable SINGLE_BYTE_CHAR_P in the
55 code (keymap.c and print.c).
57 * Rationalize character syntax and its relationship to the Unicode
58 database. (Applies mainly to symbol an punctuation syntax.)
60 * Fontset handling and customization needs work. We want to relate
61 fonts to scripts, probably based on the Unicode blocks. The
62 presence of small-repertoire 10646-encoded fonts in XFree 4 is a
63 pain, not currently worked round.
65 With the change on 2002-07-26, multiple fonts can be
66 specified in a fontset for a specific range of characters.
67 Each range can also be specified by script. Before using
68 ISO10646 fonts, Emacs checks their repertories to avoid such
69 fonts that don't have a glyph for a specific character.
71 fx has worked on fontset customization, but was stymied by
72 basic problems with the way the default face is dealt with
73 (and something else, I think). This needs revisiting.
75 * Work is also needed on charset and coding system priorities.
77 * The relevant bits of latin1-disp.el need porting (and probably
78 re-naming/updating). See also cyril-util.el.
80 * Quail files need more work now the encoding is largely irrelevant.
82 * What to do with the old coding categories stuff?
84 * The preferred-coding-system property of charsets should probably be
85 junked unless it can be made more useful now.
87 * find-multibyte-characters needs looking at.
89 * Implement Korean cp949/UHC, BIG5-HKSCS and any other important missing
92 * Lazy-load tables for unify-charset somehow?
94 Actually, Emacs clears out all charset maps and unify-map just
95 before dumping, and they are loaded again on demand by the
96 dumped emacs. But, those maps (char tables) generated while
97 temacs is running can't be removed from the dumped emacs.
99 * iso-2022 charsets get unified on i/o.
101 With the change on 2003-01-06, decoding routines put the 'charset'
102 property onto decoded text, and iso-2022 encoder pay attention
103 to it. Thus, for instance, reading and writing by
104 iso-2022-7bit preserve the original designation sequences.
105 The property name 'preferred-charset' may be better?
107 We may have to utilize this property to decide a font.
109 * Revisit locale processing: look at treating the language and
110 charset parts separately. (Language should affect things like
111 spelling and calendar, but that's not a Unicode issue.)
113 * Handle Unicode combining characters usefully, e.g. diacritics, and
114 handle more scripts specifically (à la Devanagari). There are
115 issues with canonicalization.
117 * We need tabular input methods, e.g. for maths symbols. (Not
118 specific to Unicode.)
120 * Need multibyte text in menus, e.g. for the above. (Not specific to
121 Unicode -- see Emacs etc/TODO, but now mostly works with gtk.)
123 * There's currently no support for Unicode normalization.
125 * Populate char-width-table correctly for Unicode characters and
126 worry about what happens when double-width charsets covering
127 non-CJK characters are unified.
129 * There are type errors lurking, e.g. in
130 Fcheck_coding_systems_region. Define ENABLE_CHECKING to find them.
132 * Old auto-save files, and similar files, such as Gnus drafts,
133 containing non-ASCII characters probably won't be re-read correctly.
139 Most Emacs source files are encoded in UTF-8 (or in ASCII, which is a
140 subset), but there are a few exceptions, listed below. Perhaps
141 someday many of these files will be converted to UTF-8, for
142 convenience when using tools like 'grep -r', but this might need
143 nontrivial changes to the build process.
147 These are verbatim copies of files taken from external sources.
148 They haven't been converted to UTF-8.
150 leim/CXTERM-DIC/4Corner.tit
151 leim/CXTERM-DIC/ARRAY30.tit
152 leim/CXTERM-DIC/ECDICT.tit
153 leim/CXTERM-DIC/ETZY.tit
154 leim/CXTERM-DIC/PY-b5.tit
155 leim/CXTERM-DIC/Punct-b5.tit
156 leim/CXTERM-DIC/QJ-b5.tit
157 leim/CXTERM-DIC/ZOZY.tit
158 leim/MISC-DIC/CTLau-b5.html
159 leim/MISC-DIC/cangjie-table.b5
163 These are verbatim copies of files taken from external sources.
164 They haven't been converted to UTF-8.
166 leim/CXTERM-DIC/CCDOSPY.tit
167 leim/CXTERM-DIC/Punct.tit
168 leim/CXTERM-DIC/QJ.tit
169 leim/CXTERM-DIC/SW.tit
170 leim/CXTERM-DIC/TONEPY.tit
171 leim/MISC-DIC/CTLau.html
172 leim/MISC-DIC/pinyin.map
173 leim/MISC-DIC/ziranma.cin
177 This file contains non-ASCII characters in unibyte strings. When
178 editing a keyboard layout it's more convenient to see 'é' than
179 '\202', and the MS-DOS compiler requires the single byte if a
180 backslash escape is not being used.
186 This file is externally generated from leim/MISC-DIC/cangjie-table.b5
187 by Big5->CNS converter. It hasn't been converted to UTF-8.
189 leim/MISC-DIC/cangjie-table.cns
193 SKK-JISYO.L is a verbatim copy of a file taken from an external source.
194 It hasn't been converted to UTF-8.
196 leim/SKK-DIC/SKK-JISYO.L
200 This is a verbatim copy of a file taken from an external source.
201 It hasn't been converted to UTF-8.
203 admin/charsets/mapfiles/cns2ucsdkw.txt
207 This file switches between CJK charsets, which is not encoded in UTF-8.
211 Each of these files contains just one CJK charset, but Emacs
212 currently has no easy way to specify set-charset-priority on a
213 per-file basis, so converting any of these files to UTF-8 might
214 change the file's appearance when viewed by an Emacs that is
215 operating in some other language environment.
217 etc/tutorials/TUTORIAL.ja
218 lisp/international/ja-dic-cnv.el
219 lisp/international/ja-dic-utl.el
220 lisp/international/kinsoku.el
221 lisp/international/kkc.el
222 lisp/international/titdic-cnv.el
223 lisp/language/japan-util.el
224 lisp/language/japanese.el
225 lisp/leim/quail/cyril-jis.el
226 lisp/leim/quail/hanja-jis.el
227 lisp/leim/quail/japanese.el
228 lisp/leim/quail/py-punct.el
229 lisp/leim/quail/pypunct-b5.el
231 This file contains just Chinese characters, and has same problem.
232 Also, it contains characters that cannot be encoded in UTF-8.
234 lisp/international/titdic-cnv.el
238 These files contain characters that cannot be encoded in UTF-8.
240 lisp/language/ethio-util.el
241 lisp/language/ethiopic.el
242 lisp/language/ind-util.el
243 lisp/language/tibet-util.el
244 lisp/language/tibetan.el
245 lisp/leim/quail/ethiopic.el
246 lisp/leim/quail/tibetan.el
250 These files contain binary data, and are not text files.
251 Some of the entries in this list are patterns, and stand for any
252 files with the listed extension.
262 etc/package-keyring.gpg
264 nextstep/GNUstep/Emacs.base/Resources/emacs.tiff
268 This file is part of GNU Emacs.
270 GNU Emacs is free software: you can redistribute it and/or modify
271 it under the terms of the GNU General Public License as published by
272 the Free Software Foundation, either version 3 of the License, or
273 (at your option) any later version.
275 GNU Emacs is distributed in the hope that it will be useful,
276 but WITHOUT ANY WARRANTY; without even the implied warranty of
277 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
278 GNU General Public License for more details.
280 You should have received a copy of the GNU General Public License
281 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.