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4ed46869 KH |
1 | ;;; mule.el --- basic commands for mulitilingual environment |
2 | ||
4ed46869 | 3 | ;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN. |
58cfed09 | 4 | ;; Licensed to the Free Software Foundation. |
4ed46869 KH |
5 | |
6 | ;; Keywords: mule, multilingual, character set, coding system | |
7 | ||
8 | ;; This file is part of GNU Emacs. | |
9 | ||
10 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
11 | ;; it under the terms of the GNU General Public License as published by | |
12 | ;; the Free Software Foundation; either version 2, or (at your option) | |
13 | ;; any later version. | |
14 | ||
15 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
19 | ||
20 | ;; You should have received a copy of the GNU General Public License | |
369314dc KH |
21 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
22 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | ;; Boston, MA 02111-1307, USA. | |
4ed46869 KH |
24 | |
25 | ;;; Code: | |
26 | ||
27 | (defconst mule-version "3.0 (MOMIJINOGA)" "\ | |
28 | Version number and name of this version of MULE (multilingual environment).") | |
29 | ||
30 | (defconst mule-version-date "1998.1.1" "\ | |
31 | Distribution date of this version of MULE (multilingual environment).") | |
32 | ||
33 | (defun load-with-code-conversion (fullname file &optional noerror nomessage) | |
34 | "Execute a file of Lisp code named FILE whose absolute path is FULLNAME. | |
35 | The FILE is decoded before evaluation if necessary. | |
36 | If optional second arg NOERROR is non-nil, | |
37 | report no error if FILE doesn't exist. | |
38 | Print messages at start and end of loading unless | |
39 | optional third arg NOMESSAGE is non-nil. | |
40 | Return t if file exists." | |
41 | (if (null (file-readable-p fullname)) | |
42 | (and (null noerror) | |
43 | (signal 'file-error (list "Cannot open load file" file))) | |
44 | ;; Read file with code conversion, and then eval. | |
45 | (let* ((buffer | |
46 | ;; To avoid any autoloading, set default-major-mode to | |
47 | ;; fundamental-mode. | |
48 | (let ((default-major-mode 'fundamental-mode)) | |
49 | ;; We can't use `generate-new-buffer' because files.el | |
50 | ;; is not yet loaded. | |
51 | (get-buffer-create (generate-new-buffer-name " *load*")))) | |
52 | (load-in-progress t)) | |
53 | (or nomessage (message "Loading %s..." file)) | |
a6acd8a2 KH |
54 | (if purify-flag |
55 | (setq preloaded-file-list (cons file preloaded-file-list))) | |
4ed46869 | 56 | (unwind-protect |
a6acd8a2 KH |
57 | (let ((load-file-name fullname) |
58 | (inhibit-file-name-operation nil)) | |
4ed46869 KH |
59 | (save-excursion |
60 | (set-buffer buffer) | |
77a61912 RS |
61 | ;; This is buffer-local. |
62 | (setq enable-multibyte-characters t) | |
4ed46869 | 63 | (insert-file-contents fullname) |
4ed46869 KH |
64 | ;; Make `kill-buffer' quiet. |
65 | (set-buffer-modified-p nil)) | |
66 | ;; Eval in the original buffer. | |
0b79b2ac | 67 | (eval-buffer buffer nil file)) |
cfc70cdf RS |
68 | (let (kill-buffer-hook kill-buffer-query-functions) |
69 | (kill-buffer buffer))) | |
4ed46869 KH |
70 | (let ((hook (assoc file after-load-alist))) |
71 | (if hook | |
72 | (mapcar (function eval) (cdr hook)))) | |
73 | (or nomessage noninteractive | |
74 | (message "Loading %s...done" file)) | |
75 | t))) | |
76 | ||
77 | ;; API (Application Program Interface) for charsets. | |
78 | ||
2e02a76f RS |
79 | ;; Return t if OBJ is a quoted symbol |
80 | ;; and the symbol is the name of a standard charset. | |
81 | (defsubst charset-quoted-standard-p (obj) | |
82 | (and (listp obj) (eq (car obj) 'quote) | |
83 | (symbolp (car-safe (cdr obj))) | |
84 | (let ((vector (get (car-safe (cdr obj)) 'charset))) | |
85 | (and (vectorp vector) | |
86 | (< (aref vector 0) 160))))) | |
4ed46869 KH |
87 | |
88 | (defsubst charsetp (object) | |
89 | "T is OBJECT is a charset." | |
90 | (and (symbolp object) (vectorp (get object 'charset)))) | |
91 | ||
92 | (defsubst charset-info (charset) | |
93 | "Return a vector of information of CHARSET. | |
94 | The elements of the vector are: | |
95 | CHARSET-ID, BYTES, DIMENSION, CHARS, WIDTH, DIRECTION, | |
96 | LEADING-CODE-BASE, LEADING-CODE-EXT, | |
97 | ISO-FINAL-CHAR, ISO-GRAPHIC-PLANE, | |
98 | REVERSE-CHARSET, SHORT-NAME, LONG-NAME, DESCRIPTION, | |
99 | PLIST, | |
100 | where | |
101 | CHARSET-ID (integer) is the identification number of the charset. | |
102 | DIMENSION (integer) is the number of bytes to represent a character of | |
103 | the charset: 1 or 2. | |
104 | CHARS (integer) is the number of characters in a dimension: 94 or 96. | |
105 | BYTE (integer) is the length of multi-byte form of a character in | |
106 | the charset: one of 1, 2, 3, and 4. | |
107 | WIDTH (integer) is the number of columns a character in the charset | |
108 | occupies on the screen: one of 0, 1, and 2. | |
109 | DIRECTION (integer) is the rendering direction of characters in the | |
110 | charset when rendering. If 0, render from right to left, else | |
111 | render from left to right. | |
112 | LEADING-CODE-BASE (integer) is the base leading-code for the | |
113 | charset. | |
114 | LEADING-CODE-EXT (integer) is the extended leading-code for the | |
115 | charset. All charsets of less than 0xA0 has the value 0. | |
116 | ISO-FINAL-CHAR (character) is the final character of the | |
117 | corresponding ISO 2022 charset. | |
118 | ISO-GRAPHIC-PLANE (integer) is the graphic plane to be invoked | |
119 | while encoding to variants of ISO 2022 coding system, one of the | |
120 | following: 0/graphic-plane-left(GL), 1/graphic-plane-right(GR). | |
121 | REVERSE-CHARSET (integer) is the charset which differs only in | |
122 | LEFT-TO-RIGHT value from the charset. If there's no such a | |
123 | charset, the value is -1. | |
124 | SHORT-NAME (string) is the short name to refer to the charset. | |
125 | LONG-NAME (string) is the long name to refer to the charset | |
126 | DESCRIPTION (string) is the description string of the charset. | |
127 | PLIST (property list) may contain any type of information a user | |
128 | want to put and get by functions `put-charset-property' and | |
129 | `get-charset-property' respectively." | |
130 | (get charset 'charset)) | |
131 | ||
132 | (defmacro charset-id (charset) | |
133 | "Return charset identification number of CHARSET." | |
2e02a76f | 134 | (if (charset-quoted-standard-p charset) |
4ed46869 KH |
135 | (aref (charset-info (nth 1 charset)) 0) |
136 | `(aref (charset-info ,charset) 0))) | |
137 | ||
138 | (defmacro charset-bytes (charset) | |
900dc6e3 KH |
139 | "Return bytes of CHARSET. |
140 | See the function `charset-info' for more detail." | |
2e02a76f | 141 | (if (charset-quoted-standard-p charset) |
4ed46869 KH |
142 | (aref (charset-info (nth 1 charset)) 1) |
143 | `(aref (charset-info ,charset) 1))) | |
144 | ||
145 | (defmacro charset-dimension (charset) | |
900dc6e3 KH |
146 | "Return dimension of CHARSET. |
147 | See the function `charset-info' for more detail." | |
2e02a76f | 148 | (if (charset-quoted-standard-p charset) |
4ed46869 KH |
149 | (aref (charset-info (nth 1 charset)) 2) |
150 | `(aref (charset-info ,charset) 2))) | |
151 | ||
152 | (defmacro charset-chars (charset) | |
900dc6e3 KH |
153 | "Return character numbers contained in a dimension of CHARSET. |
154 | See the function `charset-info' for more detail." | |
2e02a76f | 155 | (if (charset-quoted-standard-p charset) |
4ed46869 KH |
156 | (aref (charset-info (nth 1 charset)) 3) |
157 | `(aref (charset-info ,charset) 3))) | |
158 | ||
159 | (defmacro charset-width (charset) | |
900dc6e3 KH |
160 | "Return width (how many column occupied on a screen) of CHARSET. |
161 | See the function `charset-info' for more detail." | |
2e02a76f | 162 | (if (charset-quoted-standard-p charset) |
4ed46869 KH |
163 | (aref (charset-info (nth 1 charset)) 4) |
164 | `(aref (charset-info ,charset) 4))) | |
165 | ||
166 | (defmacro charset-direction (charset) | |
900dc6e3 KH |
167 | "Return direction of CHARSET. |
168 | See the function `charset-info' for more detail." | |
2e02a76f | 169 | (if (charset-quoted-standard-p charset) |
4ed46869 KH |
170 | (aref (charset-info (nth 1 charset)) 5) |
171 | `(aref (charset-info ,charset) 5))) | |
172 | ||
173 | (defmacro charset-iso-final-char (charset) | |
900dc6e3 KH |
174 | "Return final char of CHARSET. |
175 | See the function `charset-info' for more detail." | |
2e02a76f | 176 | (if (charset-quoted-standard-p charset) |
4ed46869 KH |
177 | (aref (charset-info (nth 1 charset)) 8) |
178 | `(aref (charset-info ,charset) 8))) | |
179 | ||
180 | (defmacro charset-iso-graphic-plane (charset) | |
900dc6e3 KH |
181 | "Return graphic plane of CHARSET. |
182 | See the function `charset-info' for more detail." | |
2e02a76f | 183 | (if (charset-quoted-standard-p charset) |
4ed46869 KH |
184 | (aref (charset-info (nth 1 charset)) 9) |
185 | `(aref (charset-info ,charset) 9))) | |
186 | ||
187 | (defmacro charset-reverse-charset (charset) | |
900dc6e3 KH |
188 | "Return reverse charset of CHARSET. |
189 | See the function `charset-info' for more detail." | |
2e02a76f | 190 | (if (charset-quoted-standard-p charset) |
4ed46869 KH |
191 | (aref (charset-info (nth 1 charset)) 10) |
192 | `(aref (charset-info ,charset) 10))) | |
193 | ||
194 | (defmacro charset-short-name (charset) | |
900dc6e3 KH |
195 | "Return short name of CHARSET. |
196 | See the function `charset-info' for more detail." | |
2e02a76f | 197 | (if (charset-quoted-standard-p charset) |
4ed46869 KH |
198 | (aref (charset-info (nth 1 charset)) 11) |
199 | `(aref (charset-info ,charset) 11))) | |
200 | ||
201 | (defmacro charset-long-name (charset) | |
900dc6e3 KH |
202 | "Return long name of CHARSET. |
203 | See the function `charset-info' for more detail." | |
2e02a76f | 204 | (if (charset-quoted-standard-p charset) |
4ed46869 KH |
205 | (aref (charset-info (nth 1 charset)) 12) |
206 | `(aref (charset-info ,charset) 12))) | |
207 | ||
208 | (defmacro charset-description (charset) | |
900dc6e3 KH |
209 | "Return descriptoin of CHARSET. |
210 | See the function `charset-info' for more detail." | |
2e02a76f | 211 | (if (charset-quoted-standard-p charset) |
4ed46869 KH |
212 | (aref (charset-info (nth 1 charset)) 13) |
213 | `(aref (charset-info ,charset) 13))) | |
214 | ||
215 | (defmacro charset-plist (charset) | |
900dc6e3 KH |
216 | "Return list charset property of CHARSET. |
217 | See the function `charset-info' for more detail." | |
2e02a76f | 218 | (if (charset-quoted-standard-p charset) |
f98e2797 | 219 | `(aref ,(charset-info (nth 1 charset)) 14) |
4ed46869 KH |
220 | `(aref (charset-info ,charset) 14))) |
221 | ||
222 | (defun set-charset-plist (charset plist) | |
900dc6e3 | 223 | "Set CHARSET's property list to PLIST, and retrun PLIST." |
4ed46869 KH |
224 | (aset (charset-info charset) 14 plist)) |
225 | ||
a6acd8a2 | 226 | (defun make-char (charset &optional c1 c2) |
f98e2797 KH |
227 | "Return a character of CHARSET and position-codes CODE1 and CODE2. |
228 | CODE1 and CODE2 are optional, but if you don't supply | |
900dc6e3 | 229 | sufficient position-codes, return a generic character which stands for |
f98e2797 | 230 | all characters or group of characters in the character sets. |
a73a8c89 | 231 | A generic character can be used to index a char table (e.g. syntax-table)." |
a6acd8a2 KH |
232 | (make-char-internal (charset-id charset) c1 c2)) |
233 | ||
234 | (put 'make-char 'byte-compile | |
235 | (function | |
236 | (lambda (form) | |
237 | (let ((charset (nth 1 form))) | |
238 | (if (charset-quoted-standard-p charset) | |
239 | (byte-compile-normal-call | |
240 | (cons 'make-char-internal | |
241 | (cons (charset-id (nth 1 charset)) (nthcdr 2 form)))) | |
242 | (byte-compile-normal-call | |
243 | (cons 'make-char-internal | |
244 | (cons (list 'charset-id charset) (nthcdr 2 form))))))))) | |
4ed46869 | 245 | |
d3675a42 | 246 | (defun charset-list () |
900dc6e3 KH |
247 | "Return list of charsets ever defined. |
248 | ||
d3675a42 | 249 | This function is provided for backward compatibility. |
900dc6e3 | 250 | Now we have the variable `charset-list'." |
d3675a42 KH |
251 | charset-list) |
252 | ||
253 | (make-obsolete 'charset-list | |
254 | "Use the variable charset-list instead.") | |
13d5617d KH |
255 | |
256 | (defsubst generic-char-p (char) | |
257 | "Return t if and only if CHAR is a generic character. | |
258 | See also the documentation of make-char." | |
259 | (let ((l (split-char char))) | |
260 | (and (or (= (nth 1 l) 0) (eq (nth 2 l) 0)) | |
261 | (not (eq (car l) 'composition))))) | |
69eba008 | 262 | |
0269ddfb | 263 | \f |
8057896b | 264 | ;; Coding system staffs |
4ed46869 | 265 | |
8057896b | 266 | ;; Coding system is a symbol that has the property `coding-system'. |
4ed46869 | 267 | ;; |
8057896b KH |
268 | ;; The value of the property `coding-system' is a vector of the |
269 | ;; following format: | |
d3675a42 | 270 | ;; [TYPE MNEMONIC DOC-STRING PLIST FLAGS] |
8057896b | 271 | ;; We call this vector as coding-spec. See comments in src/coding.c |
d3675a42 | 272 | ;; for more detail. |
8057896b KH |
273 | |
274 | (defconst coding-spec-type-idx 0) | |
275 | (defconst coding-spec-mnemonic-idx 1) | |
276 | (defconst coding-spec-doc-string-idx 2) | |
0269ddfb | 277 | (defconst coding-spec-plist-idx 3) |
8057896b KH |
278 | (defconst coding-spec-flags-idx 4) |
279 | ||
a6acd8a2 KH |
280 | ;; PLIST is a property list of a coding system. To share PLIST among |
281 | ;; alias coding systems, a coding system has PLIST in coding-spec | |
282 | ;; instead of having it in normal property list of Lisp symbol. | |
283 | ;; Here's a list of coding system properties currently being used. | |
0269ddfb KH |
284 | ;; |
285 | ;; o coding-category | |
286 | ;; | |
287 | ;; The value is a coding category the coding system belongs to. The | |
288 | ;; function `make-coding-system' and `define-coding-system-alias' sets | |
289 | ;; this value automatically. | |
4ed46869 | 290 | ;; |
0269ddfb | 291 | ;; o alias-coding-systems |
4ed46869 | 292 | ;; |
0269ddfb KH |
293 | ;; The value is a list of coding systems of the same alias group. The |
294 | ;; first element is the coding system made at first, which we call as | |
295 | ;; `base coding system'. The function `make-coding-system' and | |
296 | ;; `define-coding-system-alias' set this value automatically. | |
297 | ;; | |
298 | ;; o post-read-conversion | |
299 | ;; | |
300 | ;; The value is a function to call after some text is inserted and | |
301 | ;; decoded by the coding system itself and before any functions in | |
302 | ;; `after-insert-functions' are called. The arguments to this | |
303 | ;; function is the same as those of a function in | |
4ed46869 KH |
304 | ;; `after-insert-functions', i.e. LENGTH of a text while putting point |
305 | ;; at the head of the text to be decoded | |
306 | ;; | |
0269ddfb KH |
307 | ;; o pre-write-conversion |
308 | ;; | |
309 | ;; The value is a function to call after all functions in | |
310 | ;; `write-region-annotate-functions' and `buffer-file-format' are | |
311 | ;; called, and before the text is encoded by the coding system itself. | |
312 | ;; The arguments to this function is the same as those of a function | |
313 | ;; in `write-region-annotate-functions', i.e. FROM and TO specifying | |
314 | ;; region of a text. | |
315 | ;; | |
316 | ;; o character-unification-table-for-decode | |
317 | ;; | |
318 | ;; The value is a unification table to be applied on decoding. See | |
319 | ;; the function `make-unification-table' for the format of unification | |
320 | ;; table. | |
321 | ;; | |
322 | ;; o character-unification-table-for-encode | |
323 | ;; | |
324 | ;; The value is a unification table to be applied on encoding. | |
a6acd8a2 KH |
325 | ;; |
326 | ;; o safe-charsets | |
327 | ;; | |
328 | ;; The value is a list of charsets safely supported by the coding | |
329 | ;; system. The value t means that all charsets Emacs handles are | |
330 | ;; supported. Even if some charset is not in this list, it doesn't | |
331 | ;; mean that the charset can't be encoded in the coding system, | |
332 | ;; instead, it just means that some other receiver of a text encoded | |
333 | ;; in the coding system won't be able to handle that charset. | |
334 | ||
0269ddfb KH |
335 | |
336 | ;; Return coding-spec of CODING-SYSTEM | |
337 | (defsubst coding-system-spec (coding-system) | |
338 | (get (check-coding-system coding-system) 'coding-system)) | |
4ed46869 | 339 | |
4ed46869 | 340 | (defun coding-system-type (coding-system) |
0269ddfb KH |
341 | "Return the coding type of CODING-SYSTEM. |
342 | A coding type is an integer value indicating the encoding method | |
343 | of CODING-SYSTEM. See the function `make-coding-system' for more detail." | |
344 | (aref (coding-system-spec coding-system) coding-spec-type-idx)) | |
4ed46869 | 345 | |
4ed46869 | 346 | (defun coding-system-mnemonic (coding-system) |
0269ddfb KH |
347 | "Return the mnemonic character of CODING-SYSTEM. |
348 | A mnemonic character of a coding system is used in mode line | |
349 | to indicate the coding system." | |
350 | (or (aref (coding-system-spec coding-system) coding-spec-mnemonic-idx) | |
8057896b | 351 | ?-)) |
4ed46869 | 352 | |
8057896b | 353 | (defun coding-system-doc-string (coding-system) |
0269ddfb KH |
354 | "Return the documentation string for CODING-SYSTEM." |
355 | (aref (coding-system-spec coding-system) coding-spec-doc-string-idx)) | |
4ed46869 | 356 | |
d3675a42 | 357 | (defun coding-system-plist (coding-system) |
0269ddfb KH |
358 | "Return the property list of CODING-SYSTEM." |
359 | (aref (coding-system-spec coding-system) coding-spec-plist-idx)) | |
d3675a42 | 360 | |
4ed46869 | 361 | (defun coding-system-flags (coding-system) |
0269ddfb KH |
362 | "Return `flags' of CODING-SYSTEM. |
363 | A `flags' of a coding system is a vector of length 32 indicating detailed | |
364 | information of a coding system. See the function `make-coding-system' | |
365 | for more detail." | |
366 | (aref (coding-system-spec coding-system) coding-spec-flags-idx)) | |
367 | ||
368 | (defun coding-system-get (coding-system prop) | |
369 | "Extract a value from CODING-SYSTEM's property list for property PROP." | |
370 | (plist-get (coding-system-plist coding-system) prop)) | |
371 | ||
372 | (defun coding-system-put (coding-system prop val) | |
373 | "Change value in CODING-SYSTEM's property list PROP to VAL." | |
374 | (let ((plist (coding-system-plist coding-system))) | |
375 | (if plist | |
376 | (plist-put plist prop val) | |
377 | (aset (coding-system-spec coding-system) coding-spec-plist-idx | |
378 | (list prop val))))) | |
379 | ||
380 | (defun coding-system-category (coding-system) | |
381 | "Return the coding category of CODING-SYSTEM." | |
382 | (coding-system-get coding-system 'coding-category)) | |
383 | ||
384 | (defun coding-system-base (coding-system) | |
385 | "Return the base coding system of CODING-SYSTEM. | |
386 | A base coding system is what made by `make-coding-system', | |
387 | not what made by `define-coding-system-alias'." | |
388 | (car (coding-system-get coding-system 'alias-coding-systems))) | |
389 | ||
390 | (defalias 'coding-system-parent 'coding-system-base) | |
391 | (make-obsolete 'coding-system-parent 'coding-system-base) | |
392 | ||
393 | ;; Coding system also has a property `eol-type'. | |
394 | ;; | |
395 | ;; This property indicates how the coding system handles end-of-line | |
396 | ;; format. The value is integer 0, 1, 2, or a vector of three coding | |
397 | ;; systems. Each integer value 0, 1, and 2 indicates the format of | |
398 | ;; end-of-line LF, CRLF, and CR respectively. A vector value | |
399 | ;; indicates that the format of end-of-line should be detected | |
400 | ;; automatically. Nth element of the vector is the subsidiary coding | |
401 | ;; system whose `eol-type' property is N. | |
4ed46869 | 402 | |
8057896b | 403 | (defun coding-system-eol-type (coding-system) |
0269ddfb KH |
404 | "Return eol-type of CODING-SYSTEM. |
405 | An eol-type is integer 0, 1, 2, or a vector of coding systems. | |
4ed46869 | 406 | |
0269ddfb KH |
407 | Integer values 0, 1, and 2 indicate a format of end-of-line; LF, |
408 | CRLF, and CR respectively. | |
409 | ||
410 | A vector value indicates that a format of end-of-line should be | |
411 | detected automatically. Nth element of the vector is the subsidiary | |
412 | coding system whose eol-type is N." | |
413 | (get coding-system 'eol-type)) | |
bd882697 | 414 | |
6e9722b0 KH |
415 | ;; Make subsidiary coding systems (eol-type variants) of CODING-SYSTEM. |
416 | (defun make-subsidiary-coding-system (coding-system) | |
0269ddfb KH |
417 | (let ((coding-spec (coding-system-spec coding-system)) |
418 | (subsidiaries (vector (intern (format "%s-unix" coding-system)) | |
8057896b KH |
419 | (intern (format "%s-dos" coding-system)) |
420 | (intern (format "%s-mac" coding-system)))) | |
0269ddfb KH |
421 | (i 0) |
422 | temp) | |
8057896b | 423 | (while (< i 3) |
0269ddfb | 424 | (put (aref subsidiaries i) 'coding-system coding-spec) |
8057896b | 425 | (put (aref subsidiaries i) 'eol-type i) |
0269ddfb KH |
426 | (setq coding-system-list |
427 | (cons (aref subsidiaries i) coding-system-list)) | |
428 | (setq coding-system-alist | |
429 | (cons (list (symbol-name (aref subsidiaries i))) | |
430 | coding-system-alist)) | |
8057896b KH |
431 | (setq i (1+ i))) |
432 | subsidiaries)) | |
4ed46869 | 433 | |
8057896b | 434 | (defun make-coding-system (coding-system type mnemonic doc-string |
a6acd8a2 | 435 | &optional flags safe-charsets) |
4ed46869 | 436 | "Define a new CODING-SYSTEM (symbol). |
a6acd8a2 KH |
437 | Remaining arguments are TYPE, MNEMONIC, DOC-STRING, FLAGS (optional), |
438 | and CHARSETS (optional) which construct a coding-spec of CODING-SYSTEM | |
439 | in the following format: | |
0269ddfb | 440 | [TYPE MNEMONIC DOC-STRING PLIST FLAGS] |
4ed46869 KH |
441 | TYPE is an integer value indicating the type of coding-system as follows: |
442 | 0: Emacs internal format, | |
443 | 1: Shift-JIS (or MS-Kanji) used mainly on Japanese PC, | |
444 | 2: ISO-2022 including many variants, | |
445 | 3: Big5 used mainly on Chinese PC, | |
cd9c3177 KH |
446 | 4: private, CCL programs provide encoding/decoding algorithm, |
447 | 5: Raw-text, which means that text contains random 8-bit codes. | |
0269ddfb | 448 | |
4ed46869 | 449 | MNEMONIC is a character to be displayed on mode line for the coding-system. |
0269ddfb | 450 | |
8057896b | 451 | DOC-STRING is a documentation string for the coding-system. |
0269ddfb KH |
452 | |
453 | PLIST is the propert list for CODING-SYSTEM. This function sets | |
a6acd8a2 KH |
454 | properties coding-category, alias-coding-systems, safe-charsets. The |
455 | first two are set automatically. The last one is set to the argument | |
456 | SAFE-CHARSETS. SAFE-CHARSETS is a list of character sets encoded | |
457 | safely in CODING-SYSTEM, or t which means all character sets are safe. | |
0269ddfb | 458 | |
4ed46869 | 459 | FLAGS specifies more precise information of each TYPE. |
d6d6d592 | 460 | |
4ed46869 KH |
461 | If TYPE is 2 (ISO-2022), FLAGS should be a list of: |
462 | CHARSET0, CHARSET1, CHARSET2, CHARSET3, SHORT-FORM, | |
463 | ASCII-EOL, ASCII-CNTL, SEVEN, LOCKING-SHIFT, SINGLE-SHIFT, | |
d6d6d592 | 464 | USE-ROMAN, USE-OLDJIS, NO-ISO6429, INIT-BOL, DESIGNATION-BOL, |
850101ed | 465 | SAFE, ACCEPT-LATIN-EXTRA-CODE. |
4ed46869 KH |
466 | CHARSETn are character sets initially designated to Gn graphic registers. |
467 | If CHARSETn is nil, Gn is never used. | |
468 | If CHARSETn is t, Gn can be used but nothing designated initially. | |
469 | If CHARSETn is a list of character sets, those character sets are | |
470 | designated to Gn on output, but nothing designated to Gn initially. | |
471 | SHORT-FORM non-nil means use short designation sequence on output. | |
472 | ASCII-EOL non-nil means designate ASCII to g0 at end of line on output. | |
473 | ASCII-CNTL non-nil means designate ASCII to g0 before control codes and | |
474 | SPACE on output. | |
475 | SEVEN non-nil means use 7-bit code only on output. | |
476 | LOCKING-SHIFT non-nil means use locking-shift. | |
477 | SINGLE-SHIFT non-nil means use single-shift. | |
478 | USE-ROMAN non-nil means designate JIS0201-1976-Roman instead of ASCII. | |
479 | USE-OLDJIS non-nil means designate JIS0208-1976 instead of JIS0208-1983. | |
480 | NO-ISO6429 non-nil means not use ISO6429's direction specification. | |
69eba008 KH |
481 | INIT-BOL non-nil means any designation state is assumed to be reset |
482 | to initial at each beginning of line on output. | |
483 | DESIGNATION-BOL non-nil means designation sequences should be placed | |
484 | at beginning of line on output. | |
a6acd8a2 KH |
485 | SAFE non-nil means convert unsafe characters to `?' on output. |
486 | Unsafe characters are what not specified in SAFE-CHARSET. | |
850101ed RS |
487 | ACCEPT-LATIN-EXTRA-CODE non-nil means code-detection routine accepts |
488 | a code specified in `latin-extra-code-table' (which see) as a valid | |
489 | code of the coding system. | |
d6d6d592 | 490 | |
4ed46869 | 491 | If TYPE is 4 (private), FLAGS should be a cons of CCL programs, |
87aba788 | 492 | for decoding and encoding. See the documentation of CCL for more detail." |
4ed46869 | 493 | |
0269ddfb KH |
494 | (if (memq coding-system coding-system-list) |
495 | (error "Coding system %s already exists")) | |
496 | ||
497 | ;; Set a value of `coding-system' property. | |
6e9722b0 | 498 | (let ((coding-spec (make-vector 5 nil)) |
0269ddfb | 499 | (no-initial-designation nil) |
6e9722b0 | 500 | coding-category) |
cd9c3177 | 501 | (if (or (not (integerp type)) (< type 0) (> type 5)) |
0269ddfb | 502 | (error "TYPE argument must be 0..5")) |
8057896b | 503 | (if (or (not (integerp mnemonic)) (<= mnemonic ? ) (> mnemonic 127)) |
0269ddfb KH |
504 | (error "MNEMONIC arguemnt must be an ASCII printable character.")) |
505 | (aset coding-spec coding-spec-type-idx type) | |
506 | (aset coding-spec coding-spec-mnemonic-idx mnemonic) | |
507 | (aset coding-spec coding-spec-doc-string-idx | |
508 | (if (stringp doc-string) doc-string "")) | |
6e9722b0 KH |
509 | (cond ((= type 0) |
510 | (setq coding-category 'coding-category-emacs-mule)) | |
511 | ((= type 1) | |
512 | (setq coding-category 'coding-category-sjis)) | |
513 | ((= type 2) ; ISO2022 | |
4ed46869 | 514 | (let ((i 0) |
6e9722b0 | 515 | (vec (make-vector 32 nil)) |
6e9722b0 | 516 | (g1-designation nil)) |
0269ddfb | 517 | (setq no-initial-designation t) |
4ed46869 KH |
518 | (while (< i 4) |
519 | (let ((charset (car flags))) | |
6e9722b0 KH |
520 | (if (and no-initial-designation |
521 | (> i 0) | |
522 | (or (charsetp charset) | |
523 | (and (consp charset) | |
524 | (charsetp (car charset))))) | |
525 | (setq no-initial-designation nil)) | |
526 | (if (charsetp charset) | |
527 | (if (= i 1) (setq g1-designation charset)) | |
528 | (if (consp charset) | |
529 | (let ((tail charset) | |
530 | elt) | |
531 | (while tail | |
532 | (setq elt (car tail)) | |
69eba008 KH |
533 | (or (not elt) (eq elt t) (charsetp elt) |
534 | (error "Invalid charset: %s" elt)) | |
6e9722b0 KH |
535 | (setq tail (cdr tail))) |
536 | (setq g1-designation (car charset))) | |
537 | (if (and charset (not (eq charset t))) | |
538 | (error "Invalid charset: %s" charset)))) | |
4ed46869 KH |
539 | (aset vec i charset)) |
540 | (setq flags (cdr flags) i (1+ i))) | |
541 | (while (and (< i 32) flags) | |
542 | (aset vec i (car flags)) | |
543 | (setq flags (cdr flags) i (1+ i))) | |
6e9722b0 | 544 | (aset coding-spec 4 vec) |
6e9722b0 KH |
545 | (setq coding-category |
546 | (if (aref vec 8) ; Use locking-shift. | |
dc64cd19 KH |
547 | (or (and (aref vec 7) 'coding-category-iso-7-else) |
548 | 'coding-category-iso-8-else) | |
6e9722b0 KH |
549 | (if (aref vec 7) ; 7-bit only. |
550 | (if (aref vec 9) ; Use single-shift. | |
dc64cd19 | 551 | 'coding-category-iso-7-else |
6e9722b0 KH |
552 | 'coding-category-iso-7) |
553 | (if no-initial-designation | |
dc64cd19 | 554 | 'coding-category-iso-8-else |
6e9722b0 KH |
555 | (if (and (charsetp g1-designation) |
556 | (= (charset-dimension g1-designation) 2)) | |
557 | 'coding-category-iso-8-2 | |
558 | 'coding-category-iso-8-1))))))) | |
559 | ((= type 3) | |
560 | (setq coding-category 'coding-category-big5)) | |
561 | ((= type 4) ; private | |
562 | (setq coding-category 'coding-category-binary) | |
4ed46869 KH |
563 | (if (and (consp flags) |
564 | (vectorp (car flags)) | |
565 | (vectorp (cdr flags))) | |
8057896b | 566 | (aset coding-spec 4 flags) |
cd9c3177 KH |
567 | (error "Invalid FLAGS argument for TYPE 4 (CCL)"))) |
568 | (t ; i.e. (= type 5) | |
569 | (setq coding-category 'coding-category-raw-text))) | |
0269ddfb KH |
570 | |
571 | (let ((plist (list 'coding-category coding-category | |
a6acd8a2 KH |
572 | 'alias-coding-systems (list coding-system) |
573 | 'safe-charsets safe-charsets))) | |
0269ddfb KH |
574 | (if no-initial-designation |
575 | (setq plist (cons 'no-initial-designation | |
576 | (cons no-initial-designation plist)))) | |
577 | (aset coding-spec coding-spec-plist-idx plist)) | |
6e9722b0 | 578 | (put coding-system 'coding-system coding-spec) |
6e9722b0 KH |
579 | (put coding-category 'coding-systems |
580 | (cons coding-system (get coding-category 'coding-systems)))) | |
4ed46869 KH |
581 | |
582 | ;; Next, set a value of `eol-type' property. The value is a vector | |
6e9722b0 | 583 | ;; of subsidiary coding systems, each corresponds to a coding system |
4ed46869 | 584 | ;; for the detected end-of-line format. |
8057896b | 585 | (put coding-system 'eol-type |
cd9c3177 | 586 | (if (or (<= type 3) (= type 5)) |
6e9722b0 | 587 | (make-subsidiary-coding-system coding-system) |
0269ddfb KH |
588 | 0)) |
589 | ||
590 | ;; At last, register CODING-SYSTEM in `coding-system-list' and | |
591 | ;; `coding-system-alist'. | |
592 | (setq coding-system-list (cons coding-system coding-system-list)) | |
593 | (setq coding-system-alist (cons (list (symbol-name coding-system)) | |
594 | coding-system-alist))) | |
8057896b | 595 | |
a42763dc | 596 | (defun define-coding-system-alias (alias coding-system) |
358d28fb | 597 | "Define ALIAS as an alias for coding system CODING-SYSTEM." |
0269ddfb KH |
598 | (put alias 'coding-system (coding-system-spec coding-system)) |
599 | (nconc (coding-system-get alias 'alias-coding-systems) (list alias)) | |
600 | (setq coding-system-list (cons alias coding-system-list)) | |
601 | (setq coding-system-alist (cons (list (symbol-name alias)) | |
602 | coding-system-alist)) | |
603 | (let ((eol-type (coding-system-eol-type coding-system))) | |
604 | (if (vectorp eol-type) | |
605 | (put alias 'eol-type (make-subsidiary-coding-system alias)) | |
606 | (put alias 'eol-type eol-type)))) | |
4ed46869 KH |
607 | |
608 | (defun set-buffer-file-coding-system (coding-system &optional force) | |
358d28fb RS |
609 | "Set the file coding-system of the current buffer to CODING-SYSTEM. |
610 | This means that when you save the buffer, it will be converted | |
611 | according to CODING-SYSTEM. For a list of possible values of CODING-SYSTEM, | |
612 | use \\[list-coding-systems]. | |
613 | ||
614 | If the buffer's previous file coding-system value specifies end-of-line | |
615 | conversion, and CODING-SYSTEM does not specify one, CODING-SYSTEM is | |
616 | merged with the already-specified end-of-line conversion. | |
617 | However, if the optional prefix argument FORCE is non-nil, | |
0269ddfb | 618 | then CODING-SYSTEM is used exactly as specified." |
ea8b56b3 | 619 | (interactive "zCoding system for visited file: \nP") |
4ed46869 KH |
620 | (check-coding-system coding-system) |
621 | (if (null force) | |
8057896b KH |
622 | (let ((x (coding-system-eol-type buffer-file-coding-system)) |
623 | (y (coding-system-eol-type coding-system))) | |
4ed46869 KH |
624 | (if (and (numberp x) (>= x 0) (<= x 2) (vectorp y)) |
625 | (setq coding-system (aref y x))))) | |
626 | (setq buffer-file-coding-system coding-system) | |
627 | (set-buffer-modified-p t) | |
628 | (force-mode-line-update)) | |
629 | ||
358d28fb RS |
630 | (defvar default-terminal-coding-system nil |
631 | "Default value for the terminal coding system. | |
632 | This is normally set according to the selected language environment. | |
633 | See also the command `set-terminal-coding-system'.") | |
634 | ||
df100398 KH |
635 | (defun set-terminal-coding-system (coding-system) |
636 | "Set coding system of your terminal to CODING-SYSTEM. | |
358d28fb RS |
637 | All text output to the terminal will be encoded |
638 | with the specified coding system. | |
639 | For a list of possible values of CODING-SYSTEM, use \\[list-coding-systems]. | |
640 | The default is determined by the selected language environment | |
641 | or by the previous use of this command." | |
642 | (interactive | |
2e02a76f RS |
643 | (list (let ((default (if (and (not (terminal-coding-system)) |
644 | default-terminal-coding-system) | |
645 | default-terminal-coding-system))) | |
646 | (read-coding-system | |
647 | (format "Coding system for terminal display (default, %s): " | |
648 | default) | |
649 | default)))) | |
358d28fb RS |
650 | (if (and (not coding-system) |
651 | (not (terminal-coding-system))) | |
652 | (setq coding-system default-terminal-coding-system)) | |
653 | (if coding-system | |
654 | (setq default-terminal-coding-system coding-system)) | |
df100398 KH |
655 | (set-terminal-coding-system-internal coding-system) |
656 | (redraw-frame (selected-frame))) | |
657 | ||
358d28fb RS |
658 | (defvar default-keyboard-coding-system nil |
659 | "Default value of the keyboard coding system. | |
660 | This is normally set according to the selected language environment. | |
661 | See also the command `set-keyboard-coding-system'.") | |
662 | ||
df100398 | 663 | (defun set-keyboard-coding-system (coding-system) |
358d28fb RS |
664 | "Set coding system for keyboard input to CODING-SYSTEM. |
665 | In addition, this command enables Encoded-kbd minor mode. | |
666 | \(If CODING-SYSTEM is nil, Encoded-bkd mode is turned off.) | |
667 | For a list of possible values of CODING-SYSTEM, use \\[list-coding-systems]. | |
668 | The default is determined by the selected language environment | |
669 | or by the previous use of this command." | |
670 | (interactive | |
2e02a76f RS |
671 | (list (let ((default (if (and (not (keyboard-coding-system)) |
672 | default-keyboard-coding-system) | |
673 | default-keyboard-coding-system))) | |
674 | (read-coding-system | |
675 | (format "Coding system for keyboard input (default, %s): " | |
676 | default) | |
677 | default)))) | |
358d28fb RS |
678 | (if (and (not coding-system) |
679 | (not (keyboard-coding-system))) | |
680 | (setq coding-system default-keyboard-coding-system)) | |
681 | (if coding-system | |
682 | (setq default-keyboard-coding-system coding-system)) | |
df100398 KH |
683 | (set-keyboard-coding-system-internal coding-system) |
684 | (encoded-kbd-mode (if coding-system 1 0))) | |
685 | ||
686 | (defun set-buffer-process-coding-system (decoding encoding) | |
358d28fb | 687 | "Set coding systems for the process associated with the current buffer. |
df100398 | 688 | DECODING is the coding system to be used to decode input from the process, |
358d28fb RS |
689 | ENCODING is the coding system to be used to encode output to the process. |
690 | ||
691 | For a list of possible values of CODING-SYSTEM, use \\[list-coding-systems]." | |
4ed46869 KH |
692 | (interactive |
693 | "zCoding-system for process input: \nzCoding-system for process output: ") | |
694 | (let ((proc (get-buffer-process (current-buffer)))) | |
695 | (if (null proc) | |
696 | (error "no process") | |
df100398 KH |
697 | (check-coding-system decoding) |
698 | (check-coding-system encoding) | |
699 | (set-process-coding-system proc decoding encoding))) | |
4ed46869 KH |
700 | (force-mode-line-update)) |
701 | ||
4ed46869 KH |
702 | (defun set-coding-priority (arg) |
703 | "Set priority of coding-category according to LIST. | |
704 | LIST is a list of coding-categories ordered by priority." | |
705 | (let (l) | |
706 | ;; Put coding-categories listed in ARG to L while checking the | |
707 | ;; validity. We assume that `coding-category-list' contains whole | |
708 | ;; coding-categories. | |
709 | (while arg | |
710 | (if (null (memq (car arg) coding-category-list)) | |
711 | (error "Invalid element in argument: %s" (car arg))) | |
712 | (setq l (cons (car arg) l)) | |
713 | (setq arg (cdr arg))) | |
714 | ;; Put coding-category not listed in ARG to L. | |
715 | (while coding-category-list | |
716 | (if (null (memq (car coding-category-list) l)) | |
717 | (setq l (cons (car coding-category-list) l))) | |
718 | (setq coding-category-list (cdr coding-category-list))) | |
719 | ;; Update `coding-category-list' and return it. | |
720 | (setq coding-category-list (nreverse l)))) | |
721 | ||
722 | ;;; FILE I/O | |
723 | ||
63561304 KH |
724 | (defun set-auto-coding (string) |
725 | "Return coding system for a file which has STRING at the head and tail. | |
726 | STRING is a concatination of the first 1K-byte and | |
727 | the last 3K-byte of the file. | |
728 | ||
729 | It checks for a -*- coding: tag in the first one or two lines of STRING. | |
730 | If there's no coding: tag in the head, it checks local variables spec | |
731 | in the tailing 3K-byte oof STRING. | |
732 | ||
733 | The return value is the specified coding system, | |
734 | or nil if nothing specified. | |
87aba788 KH |
735 | |
736 | The variable `auto-file-coding-system' (which see) is set to this | |
737 | function by default." | |
63561304 KH |
738 | (condition-case nil |
739 | (let ((case-fold-search t) | |
740 | (len (length string)) | |
741 | (limit (string-match "\n" string)) | |
742 | (coding-system nil)) | |
743 | ||
744 | ;; At first check the head. | |
745 | (if limit | |
746 | (when (string-match "^#!" string) | |
747 | ;; If the file begins with "#!" (exec interpreter | |
748 | ;; magic), look for coding frobs in the first two lines. | |
749 | ;; You cannot necessarily put them in the first line of | |
750 | ;; such a file without screwing up the interpreter | |
751 | ;; invocation. | |
752 | (setq limit (string-match "\n" string limit)) | |
753 | (or limit | |
754 | (setq limit len))) | |
755 | (setq limit len)) | |
35ce8cd7 RS |
756 | (when (and (string-match "-\\*-\\(.*;\\)?[ \t]*coding:[ \t]*\\([^ ;]+\\)" string) |
757 | (< (match-beginning 2) limit)) | |
63561304 | 758 | (setq coding-system |
35ce8cd7 | 759 | (intern (substring string (match-beginning 2) (match-end 2)))) |
63561304 KH |
760 | (if (not (coding-system-p coding-system)) |
761 | (setq coding-system nil))) | |
762 | ||
763 | ;; If no coding system is specified in the head, check the tail. | |
764 | (when (and (not coding-system) | |
765 | (let ((idx (if (> len 3000) (- len 3000) 0)) | |
766 | start) | |
767 | (while (setq start (string-match "\n\^L" string idx)) | |
768 | (setq idx (+ start 2))) | |
769 | (string-match | |
770 | "^\\(.*\\)[ \t]*Local Variables:[ \t]*\\(.*\\)$" | |
771 | string idx))) | |
772 | ;; The prefix is what comes before "local variables:" in its line. | |
773 | ;; The suffix is what comes after "local variables:" in its line. | |
774 | (let* ((idx (1+ (match-end 0))) | |
775 | (prefix (regexp-quote | |
776 | (substring string | |
777 | (match-beginning 1) (match-end 1)))) | |
778 | (suffix (regexp-quote | |
779 | (substring string | |
780 | (match-beginning 2) (match-end 2)))) | |
781 | (re-coding (concat "^" prefix | |
782 | "coding[ \t]*:[ \t]*\\([^ \t]+\\)[ \t]*" | |
783 | suffix "$")) | |
784 | (re-end (concat "^" prefix "end *:[ \t]*" suffix "$")) | |
785 | (limit (or (string-match re-end string idx) len))) | |
786 | (when (and (setq idx (string-match re-coding string idx)) | |
787 | (< idx limit)) | |
788 | (setq coding-system | |
789 | (intern (substring string | |
790 | (match-beginning 1) (match-end 1)))) | |
791 | (or (coding-system-p coding-system) | |
792 | (setq coding-system nil))))) | |
793 | ||
794 | coding-system) | |
795 | (error nil))) | |
796 | ||
797 | (setq set-auto-coding-function 'set-auto-coding) | |
87aba788 | 798 | |
4ed46869 KH |
799 | ;; Set buffer-file-coding-system of the current buffer after some text |
800 | ;; is inserted. | |
801 | (defun after-insert-file-set-buffer-file-coding-system (inserted) | |
802 | (if last-coding-system-used | |
803 | (let ((coding-system | |
804 | (find-new-buffer-file-coding-system last-coding-system-used)) | |
805 | (modified-p (buffer-modified-p))) | |
0269ddfb KH |
806 | (when coding-system |
807 | (set-buffer-file-coding-system coding-system) | |
808 | (if (or (eq coding-system 'no-conversion) | |
809 | (eq (coding-system-type coding-system) 5)) | |
810 | ;; It seems that random 8-bit codes are read. We had | |
811 | ;; better edit this buffer without multibyte character | |
812 | ;; facility. | |
813 | (setq enable-multibyte-characters nil)) | |
814 | (set-buffer-modified-p modified-p)))) | |
4ed46869 KH |
815 | nil) |
816 | ||
817 | (setq after-insert-file-functions | |
818 | (cons 'after-insert-file-set-buffer-file-coding-system | |
819 | after-insert-file-functions)) | |
820 | ||
8057896b | 821 | ;; The coding-spec and eol-type of coding-system returned is decided |
4ed46869 KH |
822 | ;; independently in the following order. |
823 | ;; 1. That of buffer-file-coding-system locally bound. | |
824 | ;; 2. That of CODING. | |
825 | ||
826 | (defun find-new-buffer-file-coding-system (coding) | |
827 | "Return a coding system for a buffer when a file of CODING is inserted. | |
a73a8c89 KH |
828 | The local variable `buffer-file-coding-system' of the current buffer |
829 | is set to the returned value. | |
df100398 | 830 | Return nil if there's no need of setting new buffer-file-coding-system." |
4ed46869 | 831 | (let (local-coding local-eol |
b685f8d6 | 832 | found-coding found-eol |
4ed46869 KH |
833 | new-coding new-eol) |
834 | (if (null coding) | |
835 | ;; Nothing found about coding. | |
836 | nil | |
837 | ||
b685f8d6 RS |
838 | ;; Get information of `buffer-file-coding-system' in LOCAL-EOL |
839 | ;; and LOCAL-CODING. | |
840 | (setq local-eol (coding-system-eol-type buffer-file-coding-system)) | |
841 | (if (null (numberp local-eol)) | |
842 | ;; But eol-type is not yet set. | |
843 | (setq local-eol nil)) | |
0269ddfb KH |
844 | (if (and buffer-file-coding-system |
845 | (not (eq (coding-system-type buffer-file-coding-system) t))) | |
846 | ;; This is not `undecided'. | |
847 | (setq local-coding (coding-system-base buffer-file-coding-system))) | |
b685f8d6 RS |
848 | |
849 | (if (and (local-variable-p 'buffer-file-coding-system) | |
850 | local-eol local-coding) | |
4ed46869 KH |
851 | ;; The current buffer has already set full coding-system, we |
852 | ;; had better not change it. | |
853 | nil | |
854 | ||
8057896b | 855 | (setq found-eol (coding-system-eol-type coding)) |
4ed46869 KH |
856 | (if (null (numberp found-eol)) |
857 | ;; But eol-type is not found. | |
858 | (setq found-eol nil)) | |
0269ddfb KH |
859 | (if (not (eq (coding-system-type coding) t)) |
860 | ;; This is not `undecided'. | |
861 | (setq found-coding (coding-system-base coding))) | |
4ed46869 KH |
862 | |
863 | ;; The local setting takes precedence over the found one. | |
b685f8d6 RS |
864 | (setq new-coding (or (and (local-variable-p 'buffer-file-coding-system) |
865 | local-coding) | |
866 | found-coding | |
867 | local-coding)) | |
868 | (setq new-eol (or (and (local-variable-p 'buffer-file-coding-system) | |
869 | local-eol) | |
870 | found-eol | |
871 | local-eol)) | |
872 | (when (numberp new-eol) | |
873 | (or new-coding | |
874 | (setq new-coding 'undecided)) | |
875 | (if (vectorp (coding-system-eol-type new-coding)) | |
876 | (setq new-coding | |
877 | (aref (coding-system-eol-type new-coding) new-eol)))) | |
878 | ;; Return a new coding system only when it is different from | |
879 | ;; the current one. | |
880 | (if (not (eq buffer-file-coding-system new-coding)) | |
881 | new-coding))))) | |
4ed46869 | 882 | |
fe831d33 GV |
883 | (defun modify-coding-system-alist (target-type regexp coding-system) |
884 | "Modify one of look up tables for finding a coding system on I/O operation. | |
8c453b46 RS |
885 | There are three of such tables, `file-coding-system-alist', |
886 | `process-coding-system-alist', and `network-coding-system-alist'. | |
fe831d33 GV |
887 | |
888 | TARGET-TYPE specifies which of them to modify. | |
8c453b46 RS |
889 | If it is `file', it affects `file-coding-system-alist' (which see). |
890 | If it is `process', it affects `process-coding-system-alist' (which see). | |
891 | If it is `network', it affects `network-codign-system-alist' (which see). | |
fe831d33 GV |
892 | |
893 | REGEXP is a regular expression matching a target of I/O operation. | |
894 | The target is a file name if TARGET-TYPE is `file', a program name if | |
895 | TARGET-TYPE is `process', or a network service name or a port number | |
896 | to connect to if TARGET-TYPE is `network'. | |
897 | ||
898 | CODING-SYSTEM is a coding system to perform code conversion on the I/O | |
8c453b46 RS |
899 | operation, or a cons cell (DECODING . ENCODING) specifying the coding systems |
900 | for decoding and encoding respectively, | |
901 | or a function symbol which, when called, returns such a cons cell." | |
fe831d33 GV |
902 | (or (memq target-type '(file process network)) |
903 | (error "Invalid target type: %s" target-type)) | |
904 | (or (stringp regexp) | |
905 | (and (eq target-type 'network) (integerp regexp)) | |
906 | (error "Invalid regular expression: %s" regexp)) | |
907 | (if (symbolp coding-system) | |
908 | (if (not (fboundp coding-system)) | |
909 | (progn | |
910 | (check-coding-system coding-system) | |
911 | (setq coding-system (cons coding-system coding-system)))) | |
912 | (check-coding-system (car coding-system)) | |
913 | (check-coding-system (cdr coding-system))) | |
914 | (cond ((eq target-type 'file) | |
915 | (let ((slot (assoc regexp file-coding-system-alist))) | |
916 | (if slot | |
917 | (setcdr slot coding-system) | |
918 | (setq file-coding-system-alist | |
919 | (cons (cons regexp coding-system) | |
920 | file-coding-system-alist))))) | |
921 | ((eq target-type 'process) | |
922 | (let ((slot (assoc regexp process-coding-system-alist))) | |
923 | (if slot | |
924 | (setcdr slot coding-system) | |
925 | (setq process-coding-system-alist | |
926 | (cons (cons regexp coding-system) | |
927 | process-coding-system-alist))))) | |
928 | (t | |
929 | (let ((slot (assoc regexp network-coding-system-alist))) | |
930 | (if slot | |
931 | (setcdr slot coding-system) | |
932 | (setq network-coding-system-alist | |
933 | (cons (cons regexp coding-system) | |
934 | network-coding-system-alist))))))) | |
935 | ||
a73a8c89 KH |
936 | (defun make-unification-table (&rest args) |
937 | "Make a unification table (char table) from arguments. | |
13d5617d KH |
938 | Each argument is a list of the form (FROM . TO), |
939 | where FROM is a character to be unified to TO. | |
940 | ||
941 | FROM can be a generic character (see make-char). In this case, TO is | |
942 | a generic character containing the same number of charcters or a | |
943 | oridinal character. If FROM and TO are both generic characters, all | |
944 | characters belonging to FROM are unified to characters belonging to TO | |
945 | without changing their position code(s)." | |
a73a8c89 KH |
946 | (let ((table (make-char-table 'character-unification-table)) |
947 | revlist) | |
948 | (while args | |
949 | (let ((elts (car args))) | |
950 | (while elts | |
13d5617d KH |
951 | (let* ((from (car (car elts))) |
952 | (from-i 0) ; degree of freedom of FROM | |
953 | (from-rev (nreverse (split-char from))) | |
954 | (to (cdr (car elts))) | |
955 | (to-i 0) ; degree of freedom of TO | |
956 | (to-rev (nreverse (split-char to)))) | |
957 | ;; Check numbers of heading 0s in FROM-REV and TO-REV. | |
958 | (while (eq (car from-rev) 0) | |
959 | (setq from-i (1+ from-i) from-rev (cdr from-rev))) | |
960 | (while (eq (car to-rev) 0) | |
961 | (setq to-i (1+ to-i) to-rev (cdr to-rev))) | |
962 | (if (and (/= from-i to-i) (/= to-i 0)) | |
963 | (error "Invalid character pair (%d . %d)" from to)) | |
964 | ;; If we have already unified TO to TO-ALT, FROM should | |
965 | ;; also be unified to TO-ALT. But, this is only if TO is | |
966 | ;; a generic character or TO-ALT is not a generic | |
967 | ;; character. | |
968 | (let ((to-alt (aref table to))) | |
969 | (if (and to-alt | |
970 | (or (> to-i 0) (not (generic-char-p to-alt)))) | |
971 | (setq to to-alt))) | |
972 | (if (> from-i 0) | |
973 | (set-char-table-default table from to) | |
974 | (aset table from to)) | |
a73a8c89 KH |
975 | ;; If we have already unified some chars to FROM, they |
976 | ;; should also be unified to TO. | |
977 | (let ((l (assq from revlist))) | |
978 | (if l | |
979 | (let ((ch (car l))) | |
980 | (setcar l to) | |
981 | (setq l (cdr l)) | |
982 | (while l | |
983 | (aset table ch to) | |
984 | (setq l (cdr l)) )))) | |
985 | ;; Now update REVLIST. | |
986 | (let ((l (assq to revlist))) | |
987 | (if l | |
988 | (setcdr l (cons from (cdr l))) | |
989 | (setq revlist (cons (list to from) revlist))))) | |
990 | (setq elts (cdr elts)))) | |
991 | (setq args (cdr args))) | |
992 | ;; Return TABLE just created. | |
993 | table)) | |
994 | ||
69eba008 KH |
995 | ;;; Initialize some variables. |
996 | ||
997 | (put 'use-default-ascent 'char-table-extra-slots 0) | |
998 | (setq use-default-ascent (make-char-table 'use-default-ascent)) | |
d6d6d592 KH |
999 | (put 'ignore-relative-composition 'char-table-extra-slots 0) |
1000 | (setq ignore-relative-composition | |
1001 | (make-char-table 'ignore-relative-composition)) | |
69eba008 KH |
1002 | |
1003 | ;;; | |
4ed46869 KH |
1004 | (provide 'mule) |
1005 | ||
1006 | ;;; mule.el ends here |