1 ;;; mule.el --- basic commands for mulitilingual environment
3 ;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
4 ;; Licensed to the Free Software Foundation.
5 ;; Copyright (C) 2001, 2002 Free Software Foundation, Inc.
7 ;; Keywords: mule, multilingual, character set, coding system
9 ;; This file is part of GNU Emacs.
11 ;; GNU Emacs is free software; you can redistribute it and/or modify
12 ;; it under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation; either version 2, or (at your option)
16 ;; GNU Emacs is distributed in the hope that it will be useful,
17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 ;; GNU General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs; see the file COPYING. If not, write to the
23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 ;; Boston, MA 02111-1307, USA.
30 (defconst mule-version "5.0 (SAKAKI)" "\
31 Version number and name of this version of MULE (multilingual environment).")
33 (defconst mule-version-date "1999.12.7" "\
34 Distribution date of this version of MULE (multilingual environment).")
36 (defun load-with-code-conversion (fullname file &optional noerror nomessage)
37 "Execute a file of Lisp code named FILE whose absolute name is FULLNAME.
38 The file contents are decoded before evaluation if necessary.
39 If optional second arg NOERROR is non-nil,
40 report no error if FILE doesn't exist.
41 Print messages at start and end of loading unless
42 optional third arg NOMESSAGE is non-nil.
43 Return t if file exists."
44 (if (null (file-readable-p fullname))
46 (signal 'file-error (list "Cannot open load file" file)))
47 ;; Read file with code conversion, and then eval.
49 ;; To avoid any autoloading, set default-major-mode to
51 ;; So that we don't get completely screwed if the
52 ;; file is encoded in some complicated character set,
53 ;; read it with real decoding, as a multibyte buffer,
54 ;; even if this is a --unibyte Emacs session.
55 (let ((default-major-mode 'fundamental-mode)
56 (default-enable-multibyte-characters t))
57 ;; We can't use `generate-new-buffer' because files.el
59 (get-buffer-create (generate-new-buffer-name " *load*"))))
61 (source (save-match-data (string-match "\\.el\\'" fullname))))
64 (message "Loading %s (source)..." file)
65 (message "Loading %s..." file)))
67 (setq preloaded-file-list (cons file preloaded-file-list)))
69 (let ((load-file-name fullname)
70 (set-auto-coding-for-load t)
71 (inhibit-file-name-operation nil))
74 (insert-file-contents fullname)
75 ;; If the loaded file was inserted with no-conversion or
76 ;; raw-text coding system, make the buffer unibyte.
77 ;; Otherwise, eval-buffer might try to interpret random
78 ;; binary junk as multibyte characters.
79 (if (and enable-multibyte-characters
80 (or (eq (coding-system-type last-coding-system-used) 5)
81 (eq last-coding-system-used 'no-conversion)))
82 (set-buffer-multibyte nil))
83 ;; Make `kill-buffer' quiet.
84 (set-buffer-modified-p nil))
85 ;; Have the original buffer current while we eval.
86 (eval-buffer buffer nil file
87 ;; If this Emacs is running with --unibyte,
88 ;; convert multibyte strings to unibyte
89 ;; after reading them.
90 ;; (not default-enable-multibyte-characters)
93 (let (kill-buffer-hook kill-buffer-query-functions)
94 (kill-buffer buffer)))
95 (let ((hook (assoc file after-load-alist)))
97 (mapcar (function eval) (cdr hook))))
98 (unless (or nomessage noninteractive)
100 (message "Loading %s (source)...done" file)
101 (message "Loading %s...done" file)))
104 ;; API (Application Program Interface) for charsets.
106 (defsubst charset-quoted-standard-p (obj)
107 "Return t if OBJ is a quoted symbol, and is the name of a standard charset."
108 (and (listp obj) (eq (car obj) 'quote)
109 (symbolp (car-safe (cdr obj)))
110 (let ((vector (get (car-safe (cdr obj)) 'charset)))
111 (and (vectorp vector)
112 (< (aref vector 0) 160)))))
114 (defsubst charsetp (object)
115 "T if OBJECT is a charset."
116 (and (symbolp object) (vectorp (get object 'charset))))
118 (defsubst charset-info (charset)
119 "Return a vector of information of CHARSET.
120 The elements of the vector are:
121 CHARSET-ID, BYTES, DIMENSION, CHARS, WIDTH, DIRECTION,
122 LEADING-CODE-BASE, LEADING-CODE-EXT,
123 ISO-FINAL-CHAR, ISO-GRAPHIC-PLANE,
124 REVERSE-CHARSET, SHORT-NAME, LONG-NAME, DESCRIPTION,
127 CHARSET-ID (integer) is the identification number of the charset.
128 BYTES (integer) is the length of multi-byte form of a character in
129 the charset: one of 1, 2, 3, and 4.
130 DIMENSION (integer) is the number of bytes to represent a character of
132 CHARS (integer) is the number of characters in a dimension: 94 or 96.
133 WIDTH (integer) is the number of columns a character in the charset
134 occupies on the screen: one of 0, 1, and 2.
135 DIRECTION (integer) is the rendering direction of characters in the
136 charset when rendering. If 0, render from left to right, else
137 render from right to left.
138 LEADING-CODE-BASE (integer) is the base leading-code for the
140 LEADING-CODE-EXT (integer) is the extended leading-code for the
141 charset. All charsets of less than 0xA0 has the value 0.
142 ISO-FINAL-CHAR (character) is the final character of the
143 corresponding ISO 2022 charset. If the charset is not assigned
144 any final character, the value is -1.
145 ISO-GRAPHIC-PLANE (integer) is the graphic plane to be invoked
146 while encoding to variants of ISO 2022 coding system, one of the
147 following: 0/graphic-plane-left(GL), 1/graphic-plane-right(GR).
148 If the charset is not assigned any final character, the value is -1.
149 REVERSE-CHARSET (integer) is the charset which differs only in
150 LEFT-TO-RIGHT value from the charset. If there's no such a
151 charset, the value is -1.
152 SHORT-NAME (string) is the short name to refer to the charset.
153 LONG-NAME (string) is the long name to refer to the charset
154 DESCRIPTION (string) is the description string of the charset.
155 PLIST (property list) may contain any type of information a user
156 want to put and get by functions `put-charset-property' and
157 `get-charset-property' respectively."
158 (get charset 'charset))
160 ;; It is better not to use backquote in this file,
161 ;; because that makes a bootstrapping problem
162 ;; if you need to recompile all the Lisp files using interpreted code.
164 (defmacro charset-id (charset)
165 "Return charset identification number of CHARSET."
166 (if (charset-quoted-standard-p charset)
167 (aref (charset-info (nth 1 charset)) 0)
168 (list 'aref (list 'charset-info charset) 0)))
170 (defmacro charset-bytes (charset)
171 "Return bytes of CHARSET.
172 See the function `charset-info' for more detail."
173 (if (charset-quoted-standard-p charset)
174 (aref (charset-info (nth 1 charset)) 1)
175 (list 'aref (list 'charset-info charset) 1)))
177 (defmacro charset-dimension (charset)
178 "Return dimension of CHARSET.
179 See the function `charset-info' for more detail."
180 (if (charset-quoted-standard-p charset)
181 (aref (charset-info (nth 1 charset)) 2)
182 (list 'aref (list 'charset-info charset) 2)))
184 (defmacro charset-chars (charset)
185 "Return character numbers contained in a dimension of CHARSET.
186 See the function `charset-info' for more detail."
187 (if (charset-quoted-standard-p charset)
188 (aref (charset-info (nth 1 charset)) 3)
189 (list 'aref (list 'charset-info charset) 3)))
191 (defmacro charset-width (charset)
192 "Return width (how many column occupied on a screen) of CHARSET.
193 See the function `charset-info' for more detail."
194 (if (charset-quoted-standard-p charset)
195 (aref (charset-info (nth 1 charset)) 4)
196 (list 'aref (list 'charset-info charset) 4)))
198 (defmacro charset-direction (charset)
199 "Return direction of CHARSET.
200 See the function `charset-info' for more detail."
201 (if (charset-quoted-standard-p charset)
202 (aref (charset-info (nth 1 charset)) 5)
203 (list 'aref (list 'charset-info charset) 5)))
205 (defmacro charset-iso-final-char (charset)
206 "Return final char of CHARSET.
207 See the function `charset-info' for more detail."
208 (if (charset-quoted-standard-p charset)
209 (aref (charset-info (nth 1 charset)) 8)
210 (list 'aref (list 'charset-info charset) 8)))
212 (defmacro charset-iso-graphic-plane (charset)
213 "Return graphic plane of CHARSET.
214 See the function `charset-info' for more detail."
215 (if (charset-quoted-standard-p charset)
216 (aref (charset-info (nth 1 charset)) 9)
217 (list 'aref (list 'charset-info charset) 9)))
219 (defmacro charset-reverse-charset (charset)
220 "Return reverse charset of CHARSET.
221 See the function `charset-info' for more detail."
222 (if (charset-quoted-standard-p charset)
223 (aref (charset-info (nth 1 charset)) 10)
224 (list 'aref (list 'charset-info charset) 10)))
226 (defmacro charset-short-name (charset)
227 "Return short name of CHARSET.
228 See the function `charset-info' for more detail."
229 (if (charset-quoted-standard-p charset)
230 (aref (charset-info (nth 1 charset)) 11)
231 (list 'aref (list 'charset-info charset) 11)))
233 (defmacro charset-long-name (charset)
234 "Return long name of CHARSET.
235 See the function `charset-info' for more detail."
236 (if (charset-quoted-standard-p charset)
237 (aref (charset-info (nth 1 charset)) 12)
238 (list 'aref (list 'charset-info charset) 12)))
240 (defmacro charset-description (charset)
241 "Return description of CHARSET.
242 See the function `charset-info' for more detail."
243 (if (charset-quoted-standard-p charset)
244 (aref (charset-info (nth 1 charset)) 13)
245 (list 'aref (list 'charset-info charset) 13)))
247 (defmacro charset-plist (charset)
248 "Return list charset property of CHARSET.
249 See the function `charset-info' for more detail."
251 (if (charset-quoted-standard-p charset)
252 (charset-info (nth 1 charset))
253 (list 'charset-info charset))
256 (defun set-charset-plist (charset plist)
257 "Set CHARSET's property list to PLIST, and return PLIST."
258 (aset (charset-info charset) 14 plist))
260 (defun make-char (charset &optional code1 code2)
261 "Return a character of CHARSET whose position codes are CODE1 and CODE2.
262 CODE1 and CODE2 are optional, but if you don't supply
263 sufficient position codes, return a generic character which stands for
264 all characters or group of characters in the character set.
265 A generic character can be used to index a char table (e.g. syntax-table).
267 Such character sets as ascii, eight-bit-control, and eight-bit-graphic
268 don't have corresponding generic characters. If CHARSET is one of
269 them and you don't supply CODE1, return the character of the smallest
272 If CODE1 or CODE2 are invalid (out of range), this function signals an
273 error. However, the eighth bit of both CODE1 and CODE2 is zeroed
274 before they are used to index CHARSET. Thus you may use, say, the
275 actual ISO 8859 character code rather than subtracting 128, as you
276 would need to index the corresponding Emacs charset."
277 (make-char-internal (charset-id charset) code1 code2))
279 (put 'make-char 'byte-compile
282 (let ((charset (nth 1 form)))
283 (if (charset-quoted-standard-p charset)
284 (byte-compile-normal-call
285 (cons 'make-char-internal
286 (cons (charset-id (nth 1 charset)) (nthcdr 2 form))))
287 (byte-compile-normal-call
288 (cons 'make-char-internal
289 (cons (list 'charset-id charset) (nthcdr 2 form)))))))))
291 (defun charset-list ()
292 "Return list of charsets ever defined.
294 This function is provided for backward compatibility.
295 Now we have the variable `charset-list'."
298 (defsubst generic-char-p (char)
299 "Return t if and only if CHAR is a generic character.
300 See also the documentation of `make-char'."
302 (let ((l (split-char char)))
303 (and (or (= (nth 1 l) 0) (eq (nth 2 l) 0))
304 (not (eq (car l) 'composition))))))
306 (defun decode-char (ccs code-point &optional restriction)
307 "Return character specified by coded character set CCS and CODE-POINT in it.
308 Return nil if such a character is not supported.
309 Currently the only supported coded character set is `ucs' (ISO/IEC
310 10646: Universal Multi-Octet Coded Character Set), and the result is
311 translated through the translation-table named
312 `utf-translation-table-for-decode' or the translation-hash-table named
313 `utf-subst-table-for-decode'.
315 Optional argument RESTRICTION specifies a way to map the pair of CCS
316 and CODE-POINT to a character. Currently not supported and just ignored."
319 (or (gethash code-point
320 (get 'utf-subst-table-for-decode 'translation-hash-table))
325 (make-char 'latin-iso8859-1 code-point))
326 ((< code-point #x2500)
327 (setq code-point (- code-point #x0100))
328 (make-char 'mule-unicode-0100-24ff
329 (+ (/ code-point 96) 32) (+ (% code-point 96) 32)))
330 ((< code-point #x3400)
331 (setq code-point (- code-point #x2500))
332 (make-char 'mule-unicode-2500-33ff
333 (+ (/ code-point 96) 32) (+ (% code-point 96) 32)))
334 ((and (>= code-point #xe000) (< code-point #x10000))
335 (setq code-point (- code-point #xe000))
336 (make-char 'mule-unicode-e000-ffff
337 (+ (/ code-point 96) 32)
338 (+ (% code-point 96) 32))))))
340 (or (aref (get 'utf-translation-table-for-decode
341 'translation-table) c)
344 (defun encode-char (char ccs &optional restriction)
345 "Return code-point in coded character set CCS that corresponds to CHAR.
346 Return nil if CHAR is not included in CCS.
347 Currently the only supported coded character set is `ucs' (ISO/IEC
348 10646: Universal Multi-Octet Coded Character Set), and CHAR is first
349 translated through the translation-table named
350 `utf-translation-table-for-encode' or the translation-hash-table named
351 `utf-subst-table-for-encode'.
353 CHAR should be in one of these charsets:
354 ascii, latin-iso8859-1, mule-unicode-0100-24ff, mule-unicode-2500-33ff,
355 mule-unicode-e000-ffff, eight-bit-control
356 Otherwise, return nil.
358 Optional argument RESTRICTION specifies a way to map CHAR to a
359 code-point in CCS. Currently not supported and just ignored."
360 (let* ((split (split-char char))
361 (charset (car split))
364 (or (gethash char (get 'utf-subst-table-for-encode
365 'translation-hash-table))
366 (let ((table (get 'utf-translation-table-for-encode
367 'translation-table)))
368 (setq trans (aref table char))
370 (setq split (split-char trans)
371 charset (car split)))
372 (cond ((eq charset 'ascii)
374 ((eq charset 'latin-iso8859-1)
375 (+ (nth 1 split) 128))
376 ((eq charset 'mule-unicode-0100-24ff)
377 (+ #x0100 (+ (* (- (nth 1 split) 32) 96)
378 (- (nth 2 split) 32))))
379 ((eq charset 'mule-unicode-2500-33ff)
380 (+ #x2500 (+ (* (- (nth 1 split) 32) 96)
381 (- (nth 2 split) 32))))
382 ((eq charset 'mule-unicode-e000-ffff)
383 (+ #xe000 (+ (* (- (nth 1 split) 32) 96)
384 (- (nth 2 split) 32))))
385 ((eq charset 'eight-bit-control)
389 ;; Coding system stuff
391 ;; Coding system is a symbol that has the property `coding-system'.
393 ;; The value of the property `coding-system' is a vector of the
395 ;; [TYPE MNEMONIC DOC-STRING PLIST FLAGS]
396 ;; We call this vector as coding-spec. See comments in src/coding.c
399 (defconst coding-spec-type-idx 0)
400 (defconst coding-spec-mnemonic-idx 1)
401 (defconst coding-spec-doc-string-idx 2)
402 (defconst coding-spec-plist-idx 3)
403 (defconst coding-spec-flags-idx 4)
405 ;; PLIST is a property list of a coding system. To share PLIST among
406 ;; alias coding systems, a coding system has PLIST in coding-spec
407 ;; instead of having it in normal property list of Lisp symbol.
408 ;; Here's a list of coding system properties currently being used.
412 ;; The value is a coding category the coding system belongs to. The
413 ;; function `make-coding-system' sets this value automatically
414 ;; unless its argument PROPERTIES specifies this property.
416 ;; o alias-coding-systems
418 ;; The value is a list of coding systems of the same alias group. The
419 ;; first element is the coding system made at first, which we call as
420 ;; `base coding system'. The function `make-coding-system' sets this
421 ;; value automatically and `define-coding-system-alias' updates it.
423 ;; See the documentation of make-coding-system for the meanings of the
424 ;; following properties.
426 ;; o post-read-conversion
427 ;; o pre-write-conversion
428 ;; o translation-table-for-decode
429 ;; o translation-table-for-encode
433 ;; o valid-codes (meaningful only for a coding system based on CCL)
436 (defsubst coding-system-spec (coding-system)
437 "Return coding-spec of CODING-SYSTEM."
438 (get (check-coding-system coding-system) 'coding-system))
440 (defun coding-system-type (coding-system)
441 "Return the coding type of CODING-SYSTEM.
442 A coding type is an integer value indicating the encoding method
443 of CODING-SYSTEM. See the function `make-coding-system' for more detail."
444 (aref (coding-system-spec coding-system) coding-spec-type-idx))
446 (defun coding-system-mnemonic (coding-system)
447 "Return the mnemonic character of CODING-SYSTEM.
448 The mnemonic character of a coding system is used in mode line
449 to indicate the coding system. If the arg is nil, return ?-."
450 (let ((spec (coding-system-spec coding-system)))
451 (if spec (aref spec coding-spec-mnemonic-idx) ?-)))
453 (defun coding-system-doc-string (coding-system)
454 "Return the documentation string for CODING-SYSTEM."
455 (aref (coding-system-spec coding-system) coding-spec-doc-string-idx))
457 (defun coding-system-plist (coding-system)
458 "Return the property list of CODING-SYSTEM."
459 (aref (coding-system-spec coding-system) coding-spec-plist-idx))
461 (defun coding-system-flags (coding-system)
462 "Return `flags' of CODING-SYSTEM.
463 A `flags' of a coding system is a vector of length 32 indicating detailed
464 information of a coding system. See the function `make-coding-system'
466 (aref (coding-system-spec coding-system) coding-spec-flags-idx))
468 (defun coding-system-get (coding-system prop)
469 "Extract a value from CODING-SYSTEM's property list for property PROP."
470 (plist-get (coding-system-plist coding-system) prop))
472 (defun coding-system-put (coding-system prop val)
473 "Change value in CODING-SYSTEM's property list PROP to VAL."
474 (let ((plist (coding-system-plist coding-system)))
476 (plist-put plist prop val)
477 (aset (coding-system-spec coding-system) coding-spec-plist-idx
480 (defun coding-system-category (coding-system)
481 "Return the coding category of CODING-SYSTEM.
482 See also `coding-category-list'."
483 (coding-system-get coding-system 'coding-category))
485 (defun coding-system-base (coding-system)
486 "Return the base coding system of CODING-SYSTEM.
487 A base coding system is what made by `make-coding-system'.
488 Any alias nor subsidiary coding systems are not base coding system."
489 (car (coding-system-get coding-system 'alias-coding-systems)))
491 (defalias 'coding-system-parent 'coding-system-base)
492 (make-obsolete 'coding-system-parent 'coding-system-base "20.3")
494 ;; Coding system also has a property `eol-type'.
496 ;; This property indicates how the coding system handles end-of-line
497 ;; format. The value is integer 0, 1, 2, or a vector of three coding
498 ;; systems. Each integer value 0, 1, and 2 indicates the format of
499 ;; end-of-line LF, CRLF, and CR respectively. A vector value
500 ;; indicates that the format of end-of-line should be detected
501 ;; automatically. Nth element of the vector is the subsidiary coding
502 ;; system whose `eol-type' property is N.
504 (defun coding-system-eol-type (coding-system)
505 "Return eol-type of CODING-SYSTEM.
506 An eol-type is integer 0, 1, 2, or a vector of coding systems.
508 Integer values 0, 1, and 2 indicate a format of end-of-line; LF,
509 CRLF, and CR respectively.
511 A vector value indicates that a format of end-of-line should be
512 detected automatically. Nth element of the vector is the subsidiary
513 coding system whose eol-type is N."
514 (get coding-system 'eol-type))
516 (defun coding-system-eol-type-mnemonic (coding-system)
517 "Return the string indicating end-of-line format of CODING-SYSTEM."
518 (let* ((eol-type (coding-system-eol-type coding-system))
519 (val (cond ((eq eol-type 0) eol-mnemonic-unix)
520 ((eq eol-type 1) eol-mnemonic-dos)
521 ((eq eol-type 2) eol-mnemonic-mac)
522 (t eol-mnemonic-undecided))))
525 (char-to-string val))))
527 (defun coding-system-lessp (x y)
528 (cond ((eq x 'no-conversion) t)
529 ((eq y 'no-conversion) nil)
530 ((eq x 'emacs-mule) t)
531 ((eq y 'emacs-mule) nil)
532 ((eq x 'undecided) t)
533 ((eq y 'undecided) nil)
534 (t (let ((c1 (coding-system-mnemonic x))
535 (c2 (coding-system-mnemonic y)))
536 (or (< (downcase c1) (downcase c2))
537 (and (not (> (downcase c1) (downcase c2)))
540 (defun add-to-coding-system-list (coding-system)
541 "Add CODING-SYSTEM to `coding-system-list' while keeping it sorted."
542 (if (or (null coding-system-list)
543 (coding-system-lessp coding-system (car coding-system-list)))
544 (setq coding-system-list (cons coding-system coding-system-list))
545 (let ((len (length coding-system-list))
546 mid (tem coding-system-list))
548 (setq mid (nthcdr (/ len 2) tem))
549 (if (coding-system-lessp (car mid) coding-system)
551 len (- len (/ len 2)))
552 (setq len (/ len 2))))
553 (setcdr tem (cons coding-system (cdr tem))))))
555 (defun coding-system-list (&optional base-only)
556 "Return a list of all existing non-subsidiary coding systems.
557 If optional arg BASE-ONLY is non-nil, only base coding systems are listed.
558 The value doesn't include subsidiary coding systems which are what
559 made from bases and aliases automatically for various end-of-line
560 formats (e.g. iso-latin-1-unix, koi8-r-dos)."
561 (let* ((codings (copy-sequence coding-system-list))
562 (tail (cons nil codings)))
563 ;; Remove subsidiary coding systems (eol variants) and alias
564 ;; coding systems (if necessary).
566 (let* ((coding (car (cdr tail)))
567 (aliases (coding-system-get coding 'alias-coding-systems)))
569 ;; CODING is an eol variant if not in ALIASES.
570 (not (memq coding aliases))
571 ;; CODING is an alias if it is not car of ALIASES.
572 (and base-only (not (eq coding (car aliases)))))
573 (setcdr tail (cdr (cdr tail)))
574 (setq tail (cdr tail)))))
577 (defun map-charset-chars (func charset)
578 "Use FUNC to map over all characters in CHARSET for side effects.
579 FUNC is a function of two args, the start and end (inclusive) of a
580 character code range. Thus FUNC should iterate over [START, END]."
581 (let* ((dim (charset-dimension charset))
582 (chars (charset-chars charset))
583 (start (if (= chars 94)
588 (make-char charset start)
589 (make-char charset (+ start chars -1)))
592 (make-char charset (+ i start) start)
593 (make-char charset (+ i start) (+ start chars -1)))))))
595 (defun optimize-char-coding-system-table ()
596 "Optimize `char-coding-system-table'.
597 Elements which compare `equal' are modified to share the same list."
601 ;; This doesn't worry about elements which are permutations of
602 ;; each other. As it is, with utf-translate-cjk on and
603 ;; code-pages loaded, the table has ~50k elements, which are
604 ;; reduced to ~1k. (`optimize-char-table' might win if
605 ;; permutations were eliminated, but that's probably a small
606 ;; effect and not easy to test.)
607 (let ((existing (car (member v cache))))
609 (aset char-coding-system-table k existing)
611 char-coding-system-table))
612 (optimize-char-table char-coding-system-table))
614 (defun register-char-codings (coding-system safe-chars)
615 "Add entries for CODING-SYSTEM to `char-coding-system-table'.
616 If SAFE-CHARS is a char-table, its non-nil entries specify characters
617 which CODING-SYSTEM encodes safely. If SAFE-CHARS is t, register
618 CODING-SYSTEM as a general one which can encode all characters."
619 (let ((general (char-table-extra-slot char-coding-system-table 0))
620 ;; Charsets which have some members in the table, but not all
621 ;; of them (i.e. not just a generic character):
622 (partials (char-table-extra-slot char-coding-system-table 1)))
623 (if (eq safe-chars t)
624 (or (memq coding-system general)
625 (set-char-table-extra-slot char-coding-system-table 0
626 (cons coding-system general)))
629 (if (and (>= key 128) val)
630 (let ((codings (aref char-coding-system-table key))
631 (charset (char-charset key)))
632 (unless (memq coding-system codings)
633 (if (and (generic-char-p key)
634 (memq charset partials))
635 ;; The generic char would clobber individual
636 ;; entries already in the table. First save the
637 ;; separate existing entries for all chars of the
638 ;; charset (with the generic entry added, if
640 (let (entry existing)
643 (while (<= start end)
644 (setq entry (aref char-coding-system-table start))
648 (if (memq coding-system entry)
650 (cons coding-system entry)))
652 (setq start (1+ start))))
654 ;; Update the generic entry.
655 (aset char-coding-system-table key
656 (cons coding-system codings))
657 ;; Override with the saved entries.
658 (dolist (elt existing)
659 (aset char-coding-system-table (car elt) (cdr elt))))
660 (aset char-coding-system-table key
661 (cons coding-system codings))
662 (unless (or (memq charset partials)
663 (generic-char-p key))
664 (push charset partials)))))))
666 ;; This is probably too expensive (e.g. multiple calls in
667 ;; ucs-tables), and only really relevant in certain cases, so do
668 ;; it explicitly where appropriate.
669 ;; (optimize-char-coding-system-table)
670 (set-char-table-extra-slot char-coding-system-table 1 partials))))
672 (defun make-subsidiary-coding-system (coding-system)
673 "Make subsidiary coding systems (eol-type variants) of CODING-SYSTEM."
674 (let ((coding-spec (coding-system-spec coding-system))
675 (subsidiaries (vector (intern (format "%s-unix" coding-system))
676 (intern (format "%s-dos" coding-system))
677 (intern (format "%s-mac" coding-system))))
681 (put (aref subsidiaries i) 'coding-system coding-spec)
682 (put (aref subsidiaries i) 'eol-type i)
683 (add-to-coding-system-list (aref subsidiaries i))
684 (setq coding-system-alist
685 (cons (list (symbol-name (aref subsidiaries i)))
686 coding-system-alist))
690 (defun transform-make-coding-system-args (name type &optional doc-string props)
691 "For internal use only.
692 Transform XEmacs style args for `make-coding-system' to Emacs style.
693 Value is a list of transformed arguments."
694 (let ((mnemonic (string-to-char (or (plist-get props 'mnemonic) "?")))
695 (eol-type (plist-get props 'eol-type))
698 ((eq eol-type 'lf) (setq eol-type 'unix))
699 ((eq eol-type 'crlf) (setq eol-type 'dos))
700 ((eq eol-type 'cr) (setq eol-type 'mac)))
701 (if (setq tmp (plist-get props 'post-read-conversion))
702 (setq properties (plist-put properties 'post-read-conversion tmp)))
703 (if (setq tmp (plist-get props 'pre-write-conversion))
704 (setq properties (plist-put properties 'pre-write-conversion tmp)))
706 ((eq type 'shift-jis)
707 `(,name 1 ,mnemonic ,doc-string () ,properties ,eol-type))
708 ((eq type 'iso2022) ; This is not perfect.
709 (if (plist-get props 'escape-quoted)
710 (error "escape-quoted is not supported: %S"
711 `(,name ,type ,doc-string ,props)))
712 (let ((g0 (plist-get props 'charset-g0))
713 (g1 (plist-get props 'charset-g1))
714 (g2 (plist-get props 'charset-g2))
715 (g3 (plist-get props 'charset-g3))
718 (eq (cadr (assoc 'latin-jisx0201
719 (plist-get props 'input-charset-conversion)))
721 (eq (cadr (assoc 'ascii
722 (plist-get props 'output-charset-conversion)))
726 (eq (cadr (assoc 'japanese-jisx0208-1978
727 (plist-get props 'input-charset-conversion)))
729 (eq (cadr (assoc 'japanese-jisx0208
730 (plist-get props 'output-charset-conversion)))
731 'japanese-jisx0208-1978))))
733 (if (plist-get props 'force-g0-on-output)
737 (if (plist-get props 'force-g1-on-output)
741 (if (plist-get props 'force-g2-on-output)
745 (if (plist-get props 'force-g3-on-output)
748 `(,name 2 ,mnemonic ,doc-string
750 ,(plist-get props 'short)
751 ,(not (plist-get props 'no-ascii-eol))
752 ,(not (plist-get props 'no-ascii-cntl))
753 ,(plist-get props 'seven)
755 ,(not (plist-get props 'lock-shift))
758 ,(plist-get props 'no-iso6429)
760 ,properties ,eol-type)))
762 `(,name 3 ,mnemonic ,doc-string () ,properties ,eol-type))
764 `(,name 4 ,mnemonic ,doc-string
765 (,(plist-get props 'decode) . ,(plist-get props 'encode))
766 ,properties ,eol-type))
768 (error "unsupported XEmacs style make-coding-style arguments: %S"
769 `(,name ,type ,doc-string ,props))))))
771 (defun make-coding-system (coding-system type mnemonic doc-string
776 "Define a new coding system CODING-SYSTEM (symbol).
777 Remaining arguments are TYPE, MNEMONIC, DOC-STRING, FLAGS (optional),
778 and PROPERTIES (optional) which construct a coding-spec of CODING-SYSTEM
779 in the following format:
780 [TYPE MNEMONIC DOC-STRING PLIST FLAGS]
782 TYPE is an integer value indicating the type of the coding system as follows:
783 0: Emacs internal format,
784 1: Shift-JIS (or MS-Kanji) used mainly on Japanese PCs,
785 2: ISO-2022 including many variants,
786 3: Big5 used mainly on Chinese PCs,
787 4: private, CCL programs provide encoding/decoding algorithm,
788 5: Raw-text, which means that text contains random 8-bit codes.
790 MNEMONIC is a character to be displayed on mode line for the coding system.
792 DOC-STRING is a documentation string for the coding system.
794 FLAGS specifies more detailed information of the coding system as follows:
796 If TYPE is 2 (ISO-2022), FLAGS is a list of these elements:
797 CHARSET0, CHARSET1, CHARSET2, CHARSET3, SHORT-FORM,
798 ASCII-EOL, ASCII-CNTL, SEVEN, LOCKING-SHIFT, SINGLE-SHIFT,
799 USE-ROMAN, USE-OLDJIS, NO-ISO6429, INIT-BOL, DESIGNATION-BOL,
800 SAFE, ACCEPT-LATIN-EXTRA-CODE.
801 CHARSETn are character sets initially designated to Gn graphic registers.
802 If CHARSETn is nil, Gn is never used.
803 If CHARSETn is t, Gn can be used but nothing designated initially.
804 If CHARSETn is a list of character sets, those character sets are
805 designated to Gn on output, but nothing designated to Gn initially.
806 But, character set `ascii' can be designated only to G0.
807 SHORT-FORM non-nil means use short designation sequence on output.
808 ASCII-EOL non-nil means designate ASCII to g0 at end of line on output.
809 ASCII-CNTL non-nil means designate ASCII to g0 before control codes and
811 SEVEN non-nil means use 7-bit code only on output.
812 LOCKING-SHIFT non-nil means use locking-shift.
813 SINGLE-SHIFT non-nil means use single-shift.
814 USE-ROMAN non-nil means designate JIS0201-1976-Roman instead of ASCII.
815 USE-OLDJIS non-nil means designate JIS0208-1976 instead of JIS0208-1983.
816 NO-ISO6429 non-nil means not use ISO6429's direction specification.
817 INIT-BOL non-nil means any designation state is assumed to be reset
818 to initial at each beginning of line on output.
819 DESIGNATION-BOL non-nil means designation sequences should be placed
820 at beginning of line on output.
821 SAFE non-nil means convert unsafe characters to `?' on output.
822 Characters not specified in the property `safe-charsets' nor
823 `safe-chars' are unsafe.
824 ACCEPT-LATIN-EXTRA-CODE non-nil means code-detection routine accepts
825 a code specified in `latin-extra-code-table' (which see) as a valid
826 code of the coding system.
828 If TYPE is 4 (private), FLAGS should be a cons of CCL programs, for
829 decoding and encoding. CCL programs should be specified by their
832 PROPERTIES is an alist of properties vs the corresponding values. The
833 following properties are recognized:
835 o post-read-conversion
837 The value is a function to call after some text is inserted and
838 decoded by the coding system itself and before any functions in
839 `after-insert-functions' are called. The argument of this
840 function is the same as for a function in
841 `after-insert-file-functions', i.e. LENGTH of the text inserted,
842 with point at the head of the text to be decoded.
844 o pre-write-conversion
846 The value is a function to call after all functions in
847 `write-region-annotate-functions' and `buffer-file-format' are
848 called, and before the text is encoded by the coding system itself.
849 The arguments to this function are the same as those of a function
850 in `write-region-annotate-functions', i.e. FROM and TO, specifying
853 o translation-table-for-decode
855 The value is a translation table to be applied on decoding. See
856 the function `make-translation-table' for the format of translation
857 table. This is not applicable to type 4 (CCL-based) coding systems.
859 o translation-table-for-encode
861 The value is a translation table to be applied on encoding. This is
862 not applicable to type 4 (CCL-based) coding systems.
866 The value is a char table. If a character has non-nil value in it,
867 the character is safely supported by the coding system. This
868 overrides the specification of safe-charsets.
872 The value is a list of charsets safely supported by the coding
873 system. The value t means that all charsets Emacs handles are
874 supported. Even if some charset is not in this list, it doesn't
875 mean that the charset can't be encoded in the coding system;
876 it just means that some other receiver of text encoded
877 in the coding system won't be able to handle that charset.
881 The value is a symbol whose name is the `MIME-charset' parameter of
884 o valid-codes (meaningful only for a coding system based on CCL)
886 The value is a list to indicate valid byte ranges of the encoded
887 file. Each element of the list is an integer or a cons of integer.
888 In the former case, the integer value is a valid byte code. In the
889 latter case, the integers specify the range of valid byte codes.
891 o composition (meaningful only when TYPE is 0 or 2)
893 If the value is non-nil, the coding system preserves composition
896 These properties are set in PLIST, a property list. This function
897 also sets properties `coding-category' and `alias-coding-systems'
900 EOL-TYPE specifies the EOL type of the coding-system in one of the
903 o symbol (unix, dos, or mac)
905 The symbol `unix' means Unix-like EOL (LF), `dos' means
906 DOS-like EOL (CRLF), and `mac' means MAC-like EOL (CR).
908 o number (0, 1, or 2)
910 The number 0, 1, and 2 mean UNIX, DOS, and MAC-like EOL
913 o vector of coding-systems of length 3
915 The EOL type is detected automatically for the coding system.
916 And, according to the detected EOL type, one of the coding
917 systems in the vector is selected. Elements of the vector
918 corresponds to Unix-like EOL, DOS-like EOL, and Mac-like EOL
921 Kludgy features for backward compatibility:
923 1. If TYPE is 4 and car or cdr of FLAGS is a vector, the vector is
924 treated as a compiled CCL code.
926 2. If PROPERTIES is just a list of character sets, the list is set as
927 a value of `safe-charsets' in PLIST."
929 ;; For compatiblity with XEmacs, we check the type of TYPE. If it
930 ;; is a symbol, perhaps, this function is called with XEmacs-style
931 ;; arguments. Here, try to transform that kind of arguments to
934 (let ((args (transform-make-coding-system-args coding-system type
935 mnemonic doc-string)))
936 (setq coding-system (car args)
938 mnemonic (nth 2 args)
939 doc-string (nth 3 args)
941 properties (nth 5 args)
942 eol-type (nth 6 args))))
944 ;; Set a value of `coding-system' property.
945 (let ((coding-spec (make-vector 5 nil))
946 (no-initial-designation t)
947 (no-alternative-designation t)
948 (accept-latin-extra-code nil)
950 (if (or (not (integerp type)) (< type 0) (> type 5))
951 (error "TYPE argument must be 0..5"))
952 (if (or (not (integerp mnemonic)) (<= mnemonic ? ) (> mnemonic 127))
953 (error "MNEMONIC argument must be an ASCII printable character"))
954 (aset coding-spec coding-spec-type-idx type)
955 (aset coding-spec coding-spec-mnemonic-idx mnemonic)
956 (aset coding-spec coding-spec-doc-string-idx
957 (purecopy (if (stringp doc-string) doc-string "")))
959 (setq coding-category 'coding-category-emacs-mule))
961 (setq coding-category 'coding-category-sjis))
962 ((= type 2) ; ISO2022
964 (vec (make-vector 32 nil))
968 (let ((charset (car fl)))
969 (if (and no-initial-designation
971 (or (charsetp charset)
973 (charsetp (car charset)))))
974 (setq no-initial-designation nil))
975 (if (charsetp charset)
976 (if (= i 1) (setq g1-designation charset))
981 (setq elt (car tail))
983 (setq no-alternative-designation nil)
984 (if (and elt (not (charsetp elt)))
985 (error "Invalid charset: %s" elt)))
986 (setq tail (cdr tail)))
987 (setq g1-designation (car charset)))
990 (setq no-alternative-designation nil)
991 (error "Invalid charset: %s" charset)))))
992 (aset vec i charset))
993 (setq fl (cdr fl) i (1+ i)))
994 (while (and (< i 32) fl)
995 (aset vec i (car fl))
996 (if (and (= i 16) ; ACCEPT-LATIN-EXTRA-CODE
998 (setq accept-latin-extra-code t))
999 (setq fl (cdr fl) i (1+ i)))
1000 (aset coding-spec 4 vec)
1001 (setq coding-category
1002 (if (aref vec 8) ; Use locking-shift.
1003 (or (and (aref vec 7) 'coding-category-iso-7-else)
1004 'coding-category-iso-8-else)
1005 (if (aref vec 7) ; 7-bit only.
1006 (if (aref vec 9) ; Use single-shift.
1007 'coding-category-iso-7-else
1008 (if no-alternative-designation
1009 'coding-category-iso-7-tight
1010 'coding-category-iso-7))
1011 (if (or no-initial-designation
1012 (not no-alternative-designation))
1013 'coding-category-iso-8-else
1014 (if (and (charsetp g1-designation)
1015 (= (charset-dimension g1-designation) 2))
1016 'coding-category-iso-8-2
1017 'coding-category-iso-8-1)))))))
1019 (setq coding-category 'coding-category-big5))
1020 ((= type 4) ; private
1021 (setq coding-category 'coding-category-ccl)
1022 (if (not (consp flags))
1023 (error "Invalid FLAGS argument for TYPE 4 (CCL)")
1024 (let ((decoder (check-ccl-program
1026 (intern (format "%s-decoder" coding-system))))
1027 (encoder (check-ccl-program
1029 (intern (format "%s-encoder" coding-system)))))
1030 (if (and decoder encoder)
1031 (aset coding-spec 4 (cons decoder encoder))
1032 (error "Invalid FLAGS argument for TYPE 4 (CCL)")))))
1033 (t ; i.e. (= type 5)
1034 (setq coding-category 'coding-category-raw-text)))
1036 (let ((plist (list 'coding-category coding-category
1037 'alias-coding-systems (list coding-system))))
1038 (if no-initial-designation
1039 (plist-put plist 'no-initial-designation t))
1041 (or (eq properties t)
1042 (not (consp (car properties)))))
1043 ;; In the old version, the arg PROPERTIES is a list to be
1044 ;; set in PLIST as a value of property `safe-charsets'.
1045 (setq properties (list (cons 'safe-charsets properties))))
1046 ;; In the current version PROPERTIES is a property list.
1047 ;; Reflect it into PLIST one by one while handling safe-chars
1049 (let ((safe-charsets (cdr (assq 'safe-charsets properties)))
1050 (safe-chars (cdr (assq 'safe-chars properties)))
1053 ;; If only safe-charsets is specified, make a char-table from
1054 ;; it, and store that char-table as the value of `safe-chars'.
1055 (if (and (not safe-chars) safe-charsets)
1057 (if (eq safe-charsets t)
1059 (setq safe-chars (make-char-table 'safe-chars))
1060 (while safe-charsets
1061 (setq charset (car safe-charsets)
1062 safe-charsets (cdr safe-charsets))
1063 (cond ((eq charset 'ascii)) ; just ignore
1064 ((eq charset 'eight-bit-control)
1067 (aset safe-chars i t)
1069 ((eq charset 'eight-bit-graphic)
1072 (aset safe-chars i t)
1075 (aset safe-chars (make-char charset) t))))
1076 (if accept-latin-extra-code
1079 (if (aref latin-extra-code-table i)
1080 (aset safe-chars i t))
1082 (setq l (cons (cons 'safe-chars safe-chars) l))))
1084 (setq prop (car (car l)) val (cdr (car l)) l (cdr l))
1085 (if (eq prop 'safe-chars)
1087 (if (and (symbolp val)
1088 (get val 'translation-table))
1089 (setq safe-chars (get val 'translation-table)))
1090 (register-char-codings coding-system safe-chars)
1091 (setq val safe-chars)))
1092 (plist-put plist prop val)))
1093 ;; The property `coding-category' may have been set differently
1094 ;; through PROPERTIES.
1095 (setq coding-category (plist-get plist 'coding-category))
1096 (aset coding-spec coding-spec-plist-idx plist))
1097 (put coding-system 'coding-system coding-spec)
1098 (put coding-category 'coding-systems
1099 (cons coding-system (get coding-category 'coding-systems))))
1101 ;; Next, set a value of `eol-type' property.
1103 ;; If EOL-TYPE is nil, set a vector of subsidiary coding
1104 ;; systems, each corresponds to a coding system for the detected
1106 (setq eol-type (make-subsidiary-coding-system coding-system)))
1108 (cond ((or (eq eol-type 'unix) (null eol-type))
1114 ((or (and (vectorp eol-type)
1115 (= (length eol-type) 3))
1116 (and (numberp eol-type)
1117 (and (>= eol-type 0)
1121 (error "Invalid EOL-TYPE spec:%S" eol-type))))
1122 (put coding-system 'eol-type eol-type)
1124 ;; At last, register CODING-SYSTEM in `coding-system-list' and
1125 ;; `coding-system-alist'.
1126 (add-to-coding-system-list coding-system)
1127 (setq coding-system-alist (cons (list (symbol-name coding-system))
1128 coding-system-alist))
1130 ;; For a coding system of cateogory iso-8-1 and iso-8-2, create
1131 ;; XXX-with-esc variants.
1132 (let ((coding-category (coding-system-category coding-system)))
1133 (if (or (eq coding-category 'coding-category-iso-8-1)
1134 (eq coding-category 'coding-category-iso-8-2))
1135 (let ((esc (intern (concat (symbol-name coding-system) "-with-esc")))
1136 (doc (format "Same as %s but can handle any charsets by ISO's escape sequences." coding-system))
1137 (safe-charsets (assq 'safe-charsets properties))
1138 (mime-charset (assq 'mime-charset properties)))
1140 (setcdr safe-charsets t)
1141 (setq properties (cons (cons 'safe-charsets t) properties)))
1143 (setcdr mime-charset nil))
1144 (make-coding-system esc type mnemonic doc
1145 (if (listp (car flags))
1146 (cons (append (car flags) '(t)) (cdr flags))
1147 (cons (list (car flags) t) (cdr flags)))
1152 (put 'safe-chars 'char-table-extra-slots 0)
1154 (defun define-coding-system-alias (alias coding-system)
1155 "Define ALIAS as an alias for coding system CODING-SYSTEM."
1156 (put alias 'coding-system (coding-system-spec coding-system))
1157 (add-to-coding-system-list alias)
1158 (setq coding-system-alist (cons (list (symbol-name alias))
1159 coding-system-alist))
1160 (let ((eol-type (coding-system-eol-type coding-system)))
1161 (if (vectorp eol-type)
1163 (nconc (coding-system-get alias 'alias-coding-systems) (list alias))
1164 (put alias 'eol-type (make-subsidiary-coding-system alias)))
1165 (put alias 'eol-type eol-type))))
1167 (defun merge-coding-systems (first second)
1168 "Fill in any unspecified aspects of coding system FIRST from SECOND.
1169 Return the resulting coding system."
1170 (let ((base (coding-system-base second))
1171 (eol (coding-system-eol-type second)))
1172 ;; If FIRST doesn't specify text conversion, merge with that of SECOND.
1173 (if (eq (coding-system-base first) 'undecided)
1174 (setq first (coding-system-change-text-conversion first base)))
1175 ;; If FIRST doesn't specify eol conversion, merge with that of SECOND.
1176 (if (and (vectorp (coding-system-eol-type first))
1177 (numberp eol) (>= eol 0) (<= eol 2))
1178 (setq first (coding-system-change-eol-conversion
1182 (defun set-buffer-file-coding-system (coding-system &optional force)
1183 "Set the file coding-system of the current buffer to CODING-SYSTEM.
1184 This means that when you save the buffer, it will be converted
1185 according to CODING-SYSTEM. For a list of possible values of CODING-SYSTEM,
1186 use \\[list-coding-systems].
1188 If CODING-SYSTEM leaves the text conversion unspecified, or if it
1189 leaves the end-of-line conversion unspecified, FORCE controls what to
1190 do. If FORCE is nil, get the unspecified aspect (or aspects) from the
1191 buffer's previous `buffer-file-coding-system' value (if it is
1192 specified there). Otherwise, levae it unspecified.
1194 This marks the buffer modified so that the succeeding \\[save-buffer]
1195 surely saves the buffer with CODING-SYSTEM. From a program, if you
1196 don't want to mark the buffer modified, just set the variable
1197 `buffer-file-coding-system' directly."
1198 (interactive "zCoding system for saving file (default, nil): \nP")
1199 (check-coding-system coding-system)
1200 (if (and coding-system buffer-file-coding-system (null force))
1202 (merge-coding-systems coding-system buffer-file-coding-system)))
1203 (setq buffer-file-coding-system coding-system)
1204 ;; This is in case of an explicit call. Normally, `normal-mode' and
1205 ;; `set-buffer-major-mode-hook' take care of setting the table.
1206 (if (fboundp 'ucs-set-table-for-input) ; don't lose when building
1207 (ucs-set-table-for-input))
1208 (set-buffer-modified-p t)
1209 (force-mode-line-update))
1211 (defun revert-buffer-with-coding-system (coding-system &optional force)
1212 "Visit the current buffer's file again using coding system CODING-SYSTEM.
1213 For a list of possible values of CODING-SYSTEM, use \\[list-coding-systems].
1215 If CODING-SYSTEM leaves the text conversion unspecified, or if it
1216 leaves the end-of-line conversion unspecified, FORCE controls what to
1217 do. If FORCE is nil, get the unspecified aspect (or aspects) from the
1218 buffer's previous `buffer-file-coding-system' value (if it is
1219 specified there). Otherwise, determine it from the file contents as
1220 usual for visiting a file."
1221 (interactive "zCoding system for visited file (default, nil): \nP")
1222 (check-coding-system coding-system)
1223 (if (and coding-system buffer-file-coding-system (null force))
1225 (merge-coding-systems coding-system buffer-file-coding-system)))
1226 (let ((coding-system-for-read coding-system))
1229 (defun set-file-name-coding-system (coding-system)
1230 "Set coding system for decoding and encoding file names to CODING-SYSTEM.
1231 It actually just set the variable `file-name-coding-system' (which
1232 see) to CODING-SYSTEM."
1233 (interactive "zCoding system for file names (default, nil): ")
1234 (check-coding-system coding-system)
1235 (setq file-name-coding-system coding-system))
1237 (defvar default-terminal-coding-system nil
1238 "Default value for the terminal coding system.
1239 This is normally set according to the selected language environment.
1240 See also the command `set-terminal-coding-system'.")
1242 (defun set-terminal-coding-system (coding-system)
1243 "Set coding system of your terminal to CODING-SYSTEM.
1244 All text output to the terminal will be encoded
1245 with the specified coding system.
1246 For a list of possible values of CODING-SYSTEM, use \\[list-coding-systems].
1247 The default is determined by the selected language environment
1248 or by the previous use of this command."
1250 (list (let ((default (if (and (not (terminal-coding-system))
1251 default-terminal-coding-system)
1252 default-terminal-coding-system)))
1254 (format "Coding system for terminal display (default, %s): "
1257 (if (and (not coding-system)
1258 (not (terminal-coding-system)))
1259 (setq coding-system default-terminal-coding-system))
1261 (setq default-terminal-coding-system coding-system))
1262 (set-terminal-coding-system-internal coding-system)
1263 (redraw-frame (selected-frame)))
1265 (defvar default-keyboard-coding-system nil
1266 "Default value of the keyboard coding system.
1267 This is normally set according to the selected language environment.
1268 See also the command `set-keyboard-coding-system'.")
1270 (defun set-keyboard-coding-system (coding-system)
1271 "Set coding system for keyboard input to CODING-SYSTEM.
1272 In addition, this command enables Encoded-kbd minor mode.
1273 \(If CODING-SYSTEM is nil, Encoded-kbd mode is turned off -- see
1274 `encoded-kbd-mode'.)
1275 For a list of possible values of CODING-SYSTEM, use \\[list-coding-systems].
1276 The default is determined by the selected language environment
1277 or by the previous use of this command."
1279 (list (let ((default (if (and (not (keyboard-coding-system))
1280 default-keyboard-coding-system)
1281 default-keyboard-coding-system)))
1283 (format "Coding system for keyboard input (default, %s): "
1286 (if (and (not coding-system)
1287 (not (keyboard-coding-system)))
1288 (setq coding-system default-keyboard-coding-system))
1290 (setq default-keyboard-coding-system coding-system))
1291 (set-keyboard-coding-system-internal coding-system)
1292 (setq keyboard-coding-system coding-system)
1293 (encoded-kbd-mode (if coding-system 1 0)))
1295 (defcustom keyboard-coding-system nil
1296 "Specify coding system for keyboard input.
1297 If you set this on a terminal which can't distinguish Meta keys from
1298 8-bit characters, you will have to use ESC to type Meta characters.
1299 See Info node `Specify Coding' and Info node `Single-Byte Character Support'.
1301 On non-windowing terminals, this is set from the locale by default.
1303 Setting this variable directly does not take effect;
1304 use either M-x customize or \\[set-keyboard-coding-system]."
1305 :type '(coding-system :tag "Coding system")
1306 :link '(info-link "(emacs)Specify Coding")
1307 :link '(info-link "(emacs)Single-Byte Character Support")
1308 :set (lambda (symbol value)
1309 ;; Don't load encoded-kbd-mode unnecessarily.
1310 (if (or value (boundp 'encoded-kbd-mode))
1311 (set-keyboard-coding-system value)
1312 (set-default 'keyboard-coding-system nil))) ; must initialize
1317 (defun set-buffer-process-coding-system (decoding encoding)
1318 "Set coding systems for the process associated with the current buffer.
1319 DECODING is the coding system to be used to decode input from the process,
1320 ENCODING is the coding system to be used to encode output to the process.
1322 For a list of possible values of CODING-SYSTEM, use \\[list-coding-systems]."
1324 "zCoding-system for output from the process: \nzCoding-system for input to the process: ")
1325 (let ((proc (get-buffer-process (current-buffer))))
1327 (error "No process")
1328 (check-coding-system decoding)
1329 (check-coding-system encoding)
1330 (set-process-coding-system proc decoding encoding)))
1331 (force-mode-line-update))
1333 (defalias 'set-clipboard-coding-system 'set-selection-coding-system)
1335 (defun set-selection-coding-system (coding-system)
1336 "Make CODING-SYSTEM used for communicating with other X clients.
1337 When sending or receiving text via cut_buffer, selection, and clipboard,
1338 the text is encoded or decoded by CODING-SYSTEM."
1339 (interactive "zCoding system for X selection: ")
1340 (check-coding-system coding-system)
1341 (setq selection-coding-system coding-system))
1343 ;; Coding system lastly specified by the command
1344 ;; set-next-selection-coding-system.
1345 (defvar last-next-selection-coding-system nil)
1347 (defun set-next-selection-coding-system (coding-system)
1348 "Make CODING-SYSTEM used for the next communication with other X clients.
1349 This setting is effective for the next communication only."
1351 (list (read-coding-system
1352 (if last-next-selection-coding-system
1353 (format "Coding system for the next X selection (default, %S): "
1354 last-next-selection-coding-system)
1355 "Coding system for the next X selection: ")
1356 last-next-selection-coding-system)))
1358 (setq last-next-selection-coding-system coding-system)
1359 (setq coding-system last-next-selection-coding-system))
1360 (check-coding-system coding-system)
1362 (setq next-selection-coding-system coding-system))
1364 (defun set-coding-priority (arg)
1365 "Set priority of coding categories according to ARG.
1366 ARG is a list of coding categories ordered by priority."
1368 (current-list (copy-sequence coding-category-list)))
1369 ;; Check the validity of ARG while deleting coding categories in
1370 ;; ARG from CURRENT-LIST. We assume that CODING-CATEGORY-LIST
1371 ;; contains all coding categories.
1373 (if (or (null (get (car l) 'coding-category-index))
1374 (null (memq (car l) current-list)))
1375 (error "Invalid or duplicated element in argument: %s" arg))
1376 (setq current-list (delq (car l) current-list))
1378 ;; Update `coding-category-list' and return it.
1379 (setq coding-category-list (append arg current-list))
1380 (set-coding-priority-internal)))
1384 (defvar non-standard-icccm-encodings-alist
1385 '(("ISO8859-15" . latin-iso8859-15)
1386 ("ISO8859-14" . latin-iso8859-14)
1389 "Alist of font charset names defined by XLFD.
1390 The cdr of each element is the corresponding Emacs charset or coding system.")
1392 ;; Functions to support "Non-Standard Character Set Encodings" defined
1393 ;; by the COMPOUND-TEXT spec.
1394 ;; We support that by converting the leading sequence of the
1395 ;; ``extended segment'' to the corresponding ISO-2022 sequences (if
1396 ;; the leading sequence names an Emacs charset), or decode the segment
1397 ;; (if it names a coding system). Encoding does the reverse.
1398 ;; This function also supports "The UTF-8 encoding" described in the
1399 ;; section 7 of the documentation fo COMPOUND-TEXT distributed with
1402 (defun ctext-post-read-conversion (len)
1403 "Decode LEN characters encoded as Compound Text with Extended Segments."
1404 (buffer-disable-undo) ; minimize consing due to insertions and deletions
1405 (narrow-to-region (point) (+ (point) len))
1407 (let ((pt (point-marker))
1408 (oldpt (point-marker))
1409 (newpt (make-marker))
1410 (modified-p (buffer-modified-p))
1411 (case-fold-search nil)
1412 last-coding-system-used
1413 encoding textlen chset)
1414 (while (re-search-forward
1415 "\\(\e\\)%/[0-4]\\([\200-\377][\200-\377]\\)\\([^\002]+\\)\002\\|\e%G[^\e]+\e%@"
1417 (set-marker newpt (point))
1418 (set-marker pt (match-beginning 0))
1419 (if (= (preceding-char) ?@)
1420 ;; We found embedded utf-8 sequence.
1422 (delete-char -3) ; delete ESC % @ at the tail
1424 (delete-char 3) ; delete ESC % G at the head
1426 (decode-coding-region oldpt pt 'ctext-no-compositions))
1427 (decode-coding-region pt newpt 'mule-utf-8)
1429 (set-marker oldpt newpt))
1430 (setq encoding (match-string 3))
1431 (setq textlen (- (+ (* (- (aref (match-string 2) 0) 128) 128)
1432 (- (aref (match-string 2) 1) 128))
1433 (1+ (length encoding))))
1435 chset (cdr (assoc-ignore-case encoding
1436 non-standard-icccm-encodings-alist)))
1438 ;; This charset is not supported--leave this extended
1439 ;; segment unaltered and skip over it.
1440 (goto-char (+ (point) textlen)))
1442 ;; If it's a charset, replace the leading escape sequence
1443 ;; with a standard ISO-2022 sequence. We will decode all
1444 ;; such segments later, in one go, when we exit the loop
1445 ;; or find an extended segment that names a coding
1446 ;; system, not a charset.
1449 (if (= 0 (charset-iso-graphic-plane chset))
1451 (if (= 1 (charset-dimension chset)) "(" "$(")
1453 (if (= 96 (charset-chars chset))
1455 (if (= 1 (charset-dimension chset)) ")" "$)")))
1456 (string (charset-iso-final-char chset)))
1458 (goto-char (+ (point) textlen)))
1459 ((coding-system-p chset)
1460 ;; If it's a coding system, we need to decode the segment
1461 ;; right away. But first, decode what we've skipped
1462 ;; across until now.
1464 (decode-coding-region oldpt pt 'ctext-no-compositions))
1465 (delete-region pt newpt)
1466 (set-marker newpt (+ newpt textlen))
1467 (decode-coding-region pt newpt chset)
1469 (set-marker oldpt newpt)))))
1470 ;; Decode what's left.
1471 (when (> (point) oldpt)
1472 (decode-coding-region oldpt (point) 'ctext-no-compositions))
1473 ;; This buffer started as unibyte, because the string we get from
1474 ;; the X selection is a unibyte string. We must now make it
1475 ;; multibyte, so that the decoded text is inserted as multibyte
1477 (set-buffer-multibyte t)
1478 (set-buffer-modified-p modified-p)
1479 (- (point-max) (point-min)))))
1481 ;; If you add charsets here, be sure to modify the regexp used by
1482 ;; ctext-pre-write-conversion to look up non-standard charsets.
1483 (defvar non-standard-designations-alist
1484 '(("$(0" . (big5 "big5-0" 2))
1485 ("$(1" . (big5 "big5-0" 2))
1486 ;; The following are actually standard; generating extended
1487 ;; segments for them is wrong and screws e.g. Latin-9 users.
1488 ;; 8859-{10,13,16} aren't Emacs charsets anyhow. -- fx
1489 ;; ("-V" . (t "iso8859-10" 1))
1490 ;; ("-Y" . (t "iso8859-13" 1))
1491 ;; ("-_" . (t "iso8859-14" 1))
1492 ;; ("-b" . (t "iso8859-15" 1))
1493 ;; ("-f" . (t "iso8859-16" 1))
1495 "Alist of ctext control sequences that introduce character sets which
1496 are not in the list of approved encodings, and the corresponding
1497 coding system, identifier string, and number of octets per encoded
1500 Each element has the form (CTLSEQ . (ENCODING CHARSET NOCTETS)). CTLSEQ
1501 is the control sequence (sans the leading ESC) that introduces the character
1502 set in the text encoded by compound-text. ENCODING is a coding system
1503 symbol; if it is t, it means that the ctext coding system already encodes
1504 the text correctly, and only the leading control sequence needs to be altered.
1505 If ENCODING is a coding system, we need to re-encode the text with that
1506 coding system. CHARSET is the name of the charset we need to put into
1507 the leading control sequence. NOCTETS is the number of octets (bytes) that
1508 encode each character in this charset. NOCTETS can be 0 (meaning the number
1509 of octets per character is variable), 1, 2, 3, or 4.")
1511 (defun ctext-pre-write-conversion (from to)
1512 "Encode characters between FROM and TO as Compound Text w/Extended Segments.
1514 If FROM is a string, or if the current buffer is not the one set up for us
1515 by run_pre_post_conversion_on_str, generate a new temp buffer, insert the
1516 text, and convert it in the temporary buffer. Otherwise, convert in-place."
1517 (cond ((and (string= (buffer-name) " *code-converting-work*")
1518 (not (stringp from)))
1519 ; Minimize consing due to subsequent insertions and deletions.
1520 (buffer-disable-undo)
1521 (narrow-to-region from to))
1523 (let ((buf (current-buffer)))
1524 (set-buffer (generate-new-buffer " *temp"))
1525 (buffer-disable-undo)
1528 (insert-buffer-substring buf from to))
1529 (setq from (point-min) to (point-max)))))
1530 (encode-coding-region from to 'ctext-no-compositions)
1531 ;; Replace ISO-2022 charset designations with extended segments, for
1532 ;; those charsets that are not part of the official X registry.
1534 (goto-char (point-min))
1535 (let ((newpt (make-marker))
1536 (case-fold-search nil)
1537 pt desig encode-info encoding chset noctets textlen)
1538 (set-buffer-multibyte nil)
1539 ;; The regexp below finds the leading sequences for big5.
1540 (while (re-search-forward "\e\\(\$([01]\\)" nil 'move)
1541 (setq desig (match-string 1)
1543 encode-info (cdr (assoc desig non-standard-designations-alist))
1544 encoding (car encode-info)
1545 chset (cadr encode-info)
1546 noctets (car (cddr encode-info)))
1547 (skip-chars-forward "^\e")
1548 (set-marker newpt (point))
1550 ((eq encoding t) ; only the leading sequence needs to be changed
1551 (setq textlen (+ (- newpt pt) (length chset) 1))
1552 ;; Generate the ICCCM control sequence for an extended segment.
1553 (replace-match (format "\e%%/%d%c%c%s
\ 2"
1555 (+ (/ textlen 128) 128)
1556 (+ (% textlen 128) 128)
1559 ((coding-system-p encoding) ; need to recode the entire segment...
1560 (set-marker pt (match-beginning 0))
1561 (decode-coding-region pt newpt 'ctext-no-compositions)
1562 (set-buffer-multibyte t)
1563 (encode-coding-region pt newpt encoding)
1564 (set-buffer-multibyte nil)
1565 (setq textlen (+ (- newpt pt) (length chset) 1))
1567 (insert (format "\e%%/%d%c%c%s
\ 2"
1569 (+ (/ textlen 128) 128)
1570 (+ (% textlen 128) 128)
1572 (goto-char newpt))))
1573 (set-buffer-multibyte t)
1574 ;; Must return nil, as build_annotations_2 expects that.
1579 (defcustom auto-coding-alist
1580 '(("\\.\\(arc\\|zip\\|lzh\\|zoo\\|jar\\|sx[dmicw]\\|tar\\|tgz\\)\\'" . no-conversion)
1581 ("\\.\\(gz\\|Z\\|bz\\|bz2\\|gpg\\)\\'" . no-conversion)
1582 ("/#[^/]+#\\'" . emacs-mule))
1583 "Alist of filename patterns vs corresponding coding systems.
1584 Each element looks like (REGEXP . CODING-SYSTEM).
1585 A file whose name matches REGEXP is decoded by CODING-SYSTEM on reading.
1587 The settings in this alist take priority over `coding:' tags
1588 in the file (see the function `set-auto-coding')
1589 and the contents of `file-coding-system-alist'."
1592 :type '(repeat (cons (regexp :tag "File name regexp")
1593 (symbol :tag "Coding system"))))
1595 (defcustom auto-coding-regexp-alist
1596 '(("^BABYL OPTIONS:[ \t]*-\\*-[ \t]*rmail[ \t]*-\\*-" . no-conversion))
1597 "Alist of patterns vs corresponding coding systems.
1598 Each element looks like (REGEXP . CODING-SYSTEM).
1599 A file whose first bytes match REGEXP is decoded by CODING-SYSTEM on reading.
1601 The settings in this alist take priority over `coding:' tags
1602 in the file (see the function `set-auto-coding')
1603 and the contents of `file-coding-system-alist'."
1606 :type '(repeat (cons (regexp :tag "Regexp")
1607 (symbol :tag "Coding system"))))
1609 ;; See the bottom of this file for built-in auto coding functions.
1610 (defcustom auto-coding-functions '(sgml-xml-auto-coding-function
1611 sgml-html-meta-auto-coding-function)
1612 "A list of functions which attempt to determine a coding system.
1614 Each function in this list should be written to operate on the current
1615 buffer, but should not modify it in any way. It should take one
1616 argument SIZE, past which it should not search. If a function
1617 succeeds in determining a coding system, it should return that coding
1618 system. Otherwise, it should return nil.
1620 Any `coding:' tags present have a higher priority than the
1621 functions in this list."
1624 :type '(repeat function))
1626 (defvar set-auto-coding-for-load nil
1627 "Non-nil means look for `load-coding' property instead of `coding'.
1628 This is used for loading and byte-compiling Emacs Lisp files.")
1630 (defun auto-coding-alist-lookup (filename)
1631 "Return the coding system specified by `auto-coding-alist' for FILENAME."
1632 (let ((alist auto-coding-alist)
1633 (case-fold-search (memq system-type '(vax-vms windows-nt ms-dos)))
1635 (while (and alist (not coding-system))
1636 (if (string-match (car (car alist)) filename)
1637 (setq coding-system (cdr (car alist)))
1638 (setq alist (cdr alist))))
1641 (defun set-auto-coding (filename size)
1642 "Return coding system for a file FILENAME of which SIZE bytes follow point.
1643 These bytes should include at least the first 1k of the file
1644 and the last 3k of the file, but the middle may be omitted.
1646 The function checks FILENAME against the variable `auto-coding-alist'.
1647 If FILENAME doesn't match any entries in the variable, it checks the
1648 contents of the current buffer following point against
1649 `auto-coding-regexp-alist'. If no match is found, it checks for a
1650 `coding:' tag in the first one or two lines following point. If no
1651 `coding:' tag is found, it checks any local variables list in the last
1652 3K bytes out of the SIZE bytes. Finally, if none of these methods
1653 succeed, it checks to see if any function in `auto-coding-functions'
1656 The return value is the specified coding system, or nil if nothing is
1659 The variable `set-auto-coding-function' (which see) is set to this
1660 function by default."
1661 (or (auto-coding-alist-lookup filename)
1662 ;; Try using `auto-coding-regexp-alist'.
1664 (let ((alist auto-coding-regexp-alist)
1666 (while (and alist (not coding-system))
1667 (let ((regexp (car (car alist))))
1668 (when (re-search-forward regexp (+ (point) size) t)
1669 (setq coding-system (cdr (car alist)))))
1670 (setq alist (cdr alist)))
1672 (let* ((case-fold-search t)
1673 (head-start (point))
1674 (head-end (+ head-start (min size 1024)))
1675 (tail-start (+ head-start (max (- size 3072) 0)))
1676 (tail-end (+ head-start size))
1677 coding-system head-found tail-found pos)
1678 ;; Try a short cut by searching for the string "coding:"
1679 ;; and for "unibyte:" at the head and tail of SIZE bytes.
1680 (setq head-found (or (search-forward "coding:" head-end t)
1681 (search-forward "unibyte:" head-end t)))
1682 (if (and head-found (> head-found tail-start))
1683 ;; Head and tail are overlapped.
1684 (setq tail-found head-found)
1685 (goto-char tail-start)
1686 (setq tail-found (or (search-forward "coding:" tail-end t)
1687 (search-forward "unibyte:" tail-end t))))
1689 ;; At first check the head.
1691 (goto-char head-start)
1692 (setq head-end (set-auto-mode-1))
1693 (setq head-start (point))
1694 (when (and head-end (< head-found head-end))
1695 (goto-char head-start)
1696 (when (and set-auto-coding-for-load
1698 "\\(.*;\\)?[ \t]*unibyte:[ \t]*\\([^ ;]+\\)"
1700 (setq coding-system 'raw-text))
1701 (when (and (not coding-system)
1703 "\\(.*;\\)?[ \t]*coding:[ \t]*\\([^ ;]+\\)"
1705 (setq coding-system (intern (match-string 2)))
1706 (or (coding-system-p coding-system)
1707 (setq coding-system nil)))))
1709 ;; If no coding: tag in the head, check the tail.
1710 (when (and tail-found (not coding-system))
1711 (goto-char tail-start)
1712 (search-forward "\n\^L" nil t)
1713 (if (re-search-forward
1714 "^\\(.*\\)[ \t]*Local Variables:[ \t]*\\(.*\\)$" tail-end t)
1715 ;; The prefix is what comes before "local variables:" in its
1716 ;; line. The suffix is what comes after "local variables:"
1718 (let* ((prefix (regexp-quote (match-string 1)))
1719 (suffix (regexp-quote (match-string 2)))
1723 ;; N.B. without the \n below, the regexp can
1725 "[ \t]*coding[ \t]*:[ \t]*\\([^ \t\n]+\\)[ \t]*"
1730 "[ \t]*unibyte[ \t]*:[ \t]*\\([^ \t\n]+\\)[ \t]*"
1733 (concat "^" prefix "[ \t]*End *:[ \t]*" suffix "$"))
1735 (re-search-forward re-end tail-end 'move)
1736 (setq tail-end (point))
1738 (when (and set-auto-coding-for-load
1739 (re-search-forward re-unibyte tail-end t))
1740 (setq coding-system 'raw-text))
1741 (when (and (not coding-system)
1742 (re-search-forward re-coding tail-end t))
1743 (setq coding-system (intern (match-string 1)))
1744 (or (coding-system-p coding-system)
1745 (setq coding-system nil))))))
1747 ;; Finally, try all the `auto-coding-functions'.
1748 (let ((funcs auto-coding-functions)
1749 (coding-system nil))
1750 (while (and funcs (not coding-system))
1751 (setq coding-system (condition-case e
1753 (goto-char (point-min))
1754 (funcall (pop funcs) size))
1758 (setq set-auto-coding-function 'set-auto-coding)
1760 (defun after-insert-file-set-buffer-file-coding-system (inserted)
1761 "Set `buffer-file-coding-system' of current buffer after text is inserted."
1762 (if last-coding-system-used
1763 (let ((coding-system
1764 (find-new-buffer-file-coding-system last-coding-system-used))
1765 (modified-p (buffer-modified-p)))
1767 (set-buffer-file-coding-system coding-system t)
1768 (if (and enable-multibyte-characters
1769 (or (eq coding-system 'no-conversion)
1770 (eq (coding-system-type coding-system) 5))
1771 ;; If buffer was unmodified and the size is the
1772 ;; same as INSERTED, we must be visiting it.
1774 (= (buffer-size) inserted))
1775 ;; For coding systems no-conversion and raw-text...,
1776 ;; edit the buffer as unibyte.
1777 (let ((pos-byte (position-bytes (+ (point) inserted))))
1778 (set-buffer-multibyte nil)
1779 (setq inserted (- pos-byte (position-bytes (point))))))
1780 (set-buffer-modified-p modified-p))))
1783 (add-hook 'after-insert-file-functions
1784 'after-insert-file-set-buffer-file-coding-system)
1786 ;; The coding-spec and eol-type of coding-system returned is decided
1787 ;; independently in the following order.
1788 ;; 1. That of buffer-file-coding-system locally bound.
1789 ;; 2. That of CODING.
1791 (defun find-new-buffer-file-coding-system (coding)
1792 "Return a coding system for a buffer when a file of CODING is inserted.
1793 The local variable `buffer-file-coding-system' of the current buffer
1794 is set to the returned value.
1795 Return nil if there's no need to set `buffer-file-coding-system'."
1796 (let (local-coding local-eol
1797 found-coding found-eol
1800 ;; Nothing found about coding.
1803 ;; Get information of `buffer-file-coding-system' in LOCAL-EOL
1804 ;; and LOCAL-CODING.
1805 (setq local-eol (coding-system-eol-type buffer-file-coding-system))
1806 (if (null (numberp local-eol))
1807 ;; But eol-type is not yet set.
1808 (setq local-eol nil))
1809 (if (and buffer-file-coding-system
1810 (not (eq (coding-system-type buffer-file-coding-system) t)))
1811 ;; This is not `undecided'.
1812 (setq local-coding (coding-system-base buffer-file-coding-system)))
1814 (if (and (local-variable-p 'buffer-file-coding-system)
1815 local-eol local-coding)
1816 ;; The current buffer has already set full coding-system, we
1817 ;; had better not change it.
1820 (setq found-eol (coding-system-eol-type coding))
1821 (if (null (numberp found-eol))
1822 ;; But eol-type is not found.
1823 ;; If EOL conversions are inhibited, force unix eol-type.
1824 (setq found-eol (if inhibit-eol-conversion 0)))
1825 (if (eq (coding-system-type coding) t)
1826 (setq found-coding 'undecided)
1827 (setq found-coding (coding-system-base coding)))
1829 (if (and (not found-eol) (eq found-coding 'undecided))
1830 ;; No valid coding information found.
1833 ;; Some coding information (eol or text) found.
1835 ;; The local setting takes precedence over the found one.
1836 (setq new-coding (if (local-variable-p 'buffer-file-coding-system)
1837 (or local-coding found-coding)
1838 (or found-coding local-coding)))
1839 (setq new-eol (if (local-variable-p 'buffer-file-coding-system)
1840 (or local-eol found-eol)
1841 (or found-eol local-eol)))
1843 (let ((eol-type (coding-system-eol-type new-coding)))
1844 (if (and (numberp new-eol) (vectorp eol-type))
1845 (aref eol-type new-eol)
1848 (defun modify-coding-system-alist (target-type regexp coding-system)
1849 "Modify one of look up tables for finding a coding system on I/O operation.
1850 There are three of such tables, `file-coding-system-alist',
1851 `process-coding-system-alist', and `network-coding-system-alist'.
1853 TARGET-TYPE specifies which of them to modify.
1854 If it is `file', it affects `file-coding-system-alist' (which see).
1855 If it is `process', it affects `process-coding-system-alist' (which see).
1856 If it is `network', it affects `network-coding-system-alist' (which see).
1858 REGEXP is a regular expression matching a target of I/O operation.
1859 The target is a file name if TARGET-TYPE is `file', a program name if
1860 TARGET-TYPE is `process', or a network service name or a port number
1861 to connect to if TARGET-TYPE is `network'.
1863 CODING-SYSTEM is a coding system to perform code conversion on the I/O
1864 operation, or a cons cell (DECODING . ENCODING) specifying the coding systems
1865 for decoding and encoding respectively,
1866 or a function symbol which, when called, returns such a cons cell."
1867 (or (memq target-type '(file process network))
1868 (error "Invalid target type: %s" target-type))
1869 (or (stringp regexp)
1870 (and (eq target-type 'network) (integerp regexp))
1871 (error "Invalid regular expression: %s" regexp))
1872 (if (symbolp coding-system)
1873 (if (not (fboundp coding-system))
1875 (check-coding-system coding-system)
1876 (setq coding-system (cons coding-system coding-system))))
1877 (check-coding-system (car coding-system))
1878 (check-coding-system (cdr coding-system)))
1879 (cond ((eq target-type 'file)
1880 (let ((slot (assoc regexp file-coding-system-alist)))
1882 (setcdr slot coding-system)
1883 (setq file-coding-system-alist
1884 (cons (cons regexp coding-system)
1885 file-coding-system-alist)))))
1886 ((eq target-type 'process)
1887 (let ((slot (assoc regexp process-coding-system-alist)))
1889 (setcdr slot coding-system)
1890 (setq process-coding-system-alist
1891 (cons (cons regexp coding-system)
1892 process-coding-system-alist)))))
1894 (let ((slot (assoc regexp network-coding-system-alist)))
1896 (setcdr slot coding-system)
1897 (setq network-coding-system-alist
1898 (cons (cons regexp coding-system)
1899 network-coding-system-alist)))))))
1901 (defun make-translation-table (&rest args)
1902 "Make a translation table from arguments.
1903 A translation table is a char table intended for character
1904 translation in CCL programs.
1906 Each argument is a list of elements of the form (FROM . TO), where FROM
1907 is a character to be translated to TO.
1909 FROM can be a generic character (see `make-char'). In this case, TO is
1910 a generic character containing the same number of characters, or an
1911 ordinary character. If FROM and TO are both generic characters, all
1912 characters belonging to FROM are translated to characters belonging to TO
1913 without changing their position code(s).
1915 The arguments and forms in each argument are processed in the given
1916 order, and if a previous form already translates TO to some other
1917 character, say TO-ALT, FROM is also translated to TO-ALT."
1918 (let ((table (make-char-table 'translation-table))
1921 (let ((elts (car args)))
1923 (let* ((from (car (car elts)))
1924 (from-i 0) ; degree of freedom of FROM
1925 (from-rev (nreverse (split-char from)))
1926 (to (cdr (car elts)))
1927 (to-i 0) ; degree of freedom of TO
1928 (to-rev (nreverse (split-char to))))
1929 ;; Check numbers of heading 0s in FROM-REV and TO-REV.
1930 (while (eq (car from-rev) 0)
1931 (setq from-i (1+ from-i) from-rev (cdr from-rev)))
1932 (while (eq (car to-rev) 0)
1933 (setq to-i (1+ to-i) to-rev (cdr to-rev)))
1934 (if (and (/= from-i to-i) (/= to-i 0))
1935 (error "Invalid character pair (%d . %d)" from to))
1936 ;; If we have already translated TO to TO-ALT, FROM should
1937 ;; also be translated to TO-ALT. But, this is only if TO
1938 ;; is a generic character or TO-ALT is not a generic
1940 (let ((to-alt (aref table to)))
1942 (or (> to-i 0) (not (generic-char-p to-alt))))
1945 (set-char-table-default table from to)
1946 (aset table from to))
1947 ;; If we have already translated some chars to FROM, they
1948 ;; should also be translated to TO.
1949 (let ((l (assq from revlist)))
1956 (setq l (cdr l)) ))))
1957 ;; Now update REVLIST.
1958 (let ((l (assq to revlist)))
1960 (setcdr l (cons from (cdr l)))
1961 (setq revlist (cons (list to from) revlist)))))
1962 (setq elts (cdr elts))))
1963 (setq args (cdr args)))
1964 ;; Return TABLE just created.
1967 (defun make-translation-table-from-vector (vec)
1968 "Make translation table from decoding vector VEC.
1969 VEC is an array of 256 elements to map unibyte codes to multibyte
1970 characters. Elements may be nil for undefined code points.
1971 See also the variable `nonascii-translation-table'."
1972 (let ((table (make-char-table 'translation-table))
1973 (rev-table (make-char-table 'translation-table))
1976 (setq ch (aref vec i))
1980 (aset rev-table ch i))))
1981 (set-char-table-extra-slot table 0 rev-table)
1984 (defun define-translation-table (symbol &rest args)
1985 "Define SYMBOL as the name of translation table made by ARGS.
1986 This sets up information so that the table can be used for
1987 translations in a CCL program.
1989 If the first element of ARGS is a char-table whose purpose is
1990 `translation-table', just define SYMBOL to name it. (Note that this
1991 function does not bind SYMBOL.)
1993 Any other ARGS should be suitable as arguments of the function
1994 `make-translation-table' (which see).
1996 This function sets properties `translation-table' and
1997 `translation-table-id' of SYMBOL to the created table itself and the
1998 identification number of the table respectively. It also registers
1999 the table in `translation-table-vector'."
2000 (let ((table (if (and (char-table-p (car args))
2001 (eq (char-table-subtype (car args))
2002 'translation-table))
2004 (apply 'make-translation-table args)))
2005 (len (length translation-table-vector))
2008 (put symbol 'translation-table table)
2011 (setq translation-table-vector
2012 (vconcat translation-table-vector (make-vector len nil))))
2013 (let ((slot (aref translation-table-vector id)))
2015 (eq (car slot) symbol))
2017 (aset translation-table-vector id (cons symbol table))
2019 (setq id (1+ id)))))
2020 (put symbol 'translation-table-id id)
2023 (put 'with-category-table 'lisp-indent-function 1)
2025 (defmacro with-category-table (category-table &rest body)
2026 `(let ((current-category-table (category-table)))
2027 (set-category-table ,category-table)
2030 (set-category-table current-category-table))))
2032 (defun define-translation-hash-table (symbol table)
2033 "Define SYMBOL as the name of the hash translation TABLE for use in CCL.
2035 Analogous to `define-translation-table', but updates
2036 `translation-hash-table-vector' and the table is for use in the CCL
2037 `lookup-integer' and `lookup-character' functions."
2038 (unless (and (symbolp symbol)
2039 (hash-table-p table))
2040 (error "Bad args to define-translation-hash-table"))
2041 (let ((len (length translation-hash-table-vector))
2044 (put symbol 'translation-hash-table table)
2047 (setq translation-hash-table-vector
2048 (vconcat translation-hash-table-vector [nil])))
2049 (let ((slot (aref translation-hash-table-vector id)))
2051 (eq (car slot) symbol))
2053 (aset translation-hash-table-vector id (cons symbol table))
2055 (setq id (1+ id)))))
2056 (put symbol 'translation-hash-table-id id)
2059 ;;; Initialize some variables.
2061 (put 'use-default-ascent 'char-table-extra-slots 0)
2062 (setq use-default-ascent (make-char-table 'use-default-ascent))
2063 (put 'ignore-relative-composition 'char-table-extra-slots 0)
2064 (setq ignore-relative-composition
2065 (make-char-table 'ignore-relative-composition))
2068 ;;; Built-in auto-coding-functions:
2070 (defun sgml-xml-auto-coding-function (size)
2071 "Determine whether the buffer is XML, and if so, its encoding.
2072 This function is intended to be added to `auto-coding-functions'."
2073 (when (re-search-forward "\\`[[:space:]\n]*<\\?xml" nil t)
2074 (let ((end (save-excursion
2076 (re-search-forward "\"\\s-*\\?>" size t))))
2078 (if (re-search-forward "encoding=\"\\(.+?\\)\"" end t)
2079 (let* ((match (match-string 1))
2080 (sym (intern (downcase match))))
2081 (if (coding-system-p sym)
2083 (message "Warning: unknown coding system \"%s\"" match)
2087 (defun sgml-html-meta-auto-coding-function (size)
2088 "If the buffer has an HTML meta tag, use it to determine encoding.
2089 This function is intended to be added to `auto-coding-functions'."
2090 (setq size (min size
2091 ;; Only search forward 10 lines
2095 (when (and (search-forward "<html>" size t)
2096 (re-search-forward "<meta\\s-+http-equiv=\"content-type\"\\s-+content=\"text/\\sw+;\\s-*charset=\\(.+?\\)\"" size t))
2097 (let* ((match (match-string 1))
2098 (sym (intern (downcase match))))
2099 (if (coding-system-p sym)
2101 (message "Warning: unknown coding system \"%s\"" match)
2107 ;;; mule.el ends here