Fix GTK font name parsing to allow numbers in names (Bug#7853).
[emacs.git] / lisp / international / mule.el
blobb71790ee575ea38e9d7ac447b31d0f7dbe351e3d
1 ;;; mule.el --- basic commands for multilingual environment
3 ;; Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
4 ;; 2007, 2008, 2009, 2010, 2011
5 ;; Free Software Foundation, Inc.
6 ;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
7 ;; 2005, 2006, 2007, 2008, 2009, 2010, 2011
8 ;; National Institute of Advanced Industrial Science and Technology (AIST)
9 ;; Registration Number H14PRO021
10 ;; Copyright (C) 2003
11 ;; National Institute of Advanced Industrial Science and Technology (AIST)
12 ;; Registration Number H13PRO009
14 ;; Keywords: mule, multilingual, character set, coding system
16 ;; This file is part of GNU Emacs.
18 ;; GNU Emacs is free software: you can redistribute it and/or modify
19 ;; it under the terms of the GNU General Public License as published by
20 ;; the Free Software Foundation, either version 3 of the License, or
21 ;; (at your option) any later version.
23 ;; GNU Emacs is distributed in the hope that it will be useful,
24 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
25 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 ;; GNU General Public License for more details.
28 ;; You should have received a copy of the GNU General Public License
29 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
31 ;;; Commentary:
33 ;;; Code:
35 (defconst mule-version "6.0 (HANACHIRUSATO)" "\
36 Version number and name of this version of MULE (multilingual environment).")
38 (defconst mule-version-date "2003.9.1" "\
39 Distribution date of this version of MULE (multilingual environment).")
42 ;;; CHARSET
44 ;; Backward compatibility code for handling emacs-mule charsets.
45 (defvar private-char-area-1-min #xF0000)
46 (defvar private-char-area-1-max #xFFFFE)
47 (defvar private-char-area-2-min #x100000)
48 (defvar private-char-area-2-max #x10FFFE)
50 ;; Table of emacs-mule charsets indexed by their emacs-mule ID.
51 (defvar emacs-mule-charset-table (make-vector 256 nil))
52 (aset emacs-mule-charset-table 0 'ascii)
54 ;; Convert the argument of old-style call of define-charset to a
55 ;; property list used by the new-style.
56 ;; INFO-VECTOR is a vector of the format:
57 ;; [DIMENSION CHARS WIDTH DIRECTION ISO-FINAL-CHAR ISO-GRAPHIC-PLANE
58 ;; SHORT-NAME LONG-NAME DESCRIPTION]
60 (defun convert-define-charset-argument (emacs-mule-id info-vector)
61 (let* ((dim (aref info-vector 0))
62 (chars (aref info-vector 1))
63 (total (if (= dim 1) chars (* chars chars)))
64 (code-space (if (= dim 1) (if (= chars 96) [32 127] [33 126])
65 (if (= chars 96) [32 127 32 127] [33 126 33 126])))
66 code-offset)
67 (if (integerp emacs-mule-id)
68 (or (= emacs-mule-id 0)
69 (and (>= emacs-mule-id 129) (< emacs-mule-id 256))
70 (error "Invalid CHARSET-ID: %d" emacs-mule-id))
71 (let (from-id to-id)
72 (if (= dim 1) (setq from-id 160 to-id 224)
73 (setq from-id 224 to-id 255))
74 (while (and (< from-id to-id)
75 (not (aref emacs-mule-charset-table from-id)))
76 (setq from-id (1+ from-id)))
77 (if (= from-id to-id)
78 (error "No more room for the new Emacs-mule charset"))
79 (setq emacs-mule-id from-id)))
80 (if (> (- private-char-area-1-max private-char-area-1-min) total)
81 (setq code-offset private-char-area-1-min
82 private-char-area-1-min (+ private-char-area-1-min total))
83 (if (> (- private-char-area-2-max private-char-area-2-min) total)
84 (setq code-offset private-char-area-2-min
85 private-char-area-2-min (+ private-char-area-2-min total))
86 (error "No more space for a new charset")))
87 (list :dimension dim
88 :code-space code-space
89 :iso-final-char (aref info-vector 4)
90 :code-offset code-offset
91 :emacs-mule-id emacs-mule-id)))
93 (defun define-charset (name docstring &rest props)
94 "Define NAME (symbol) as a charset with DOCSTRING.
95 The remaining arguments must come in pairs ATTRIBUTE VALUE. ATTRIBUTE
96 may be any symbol. The following have special meanings, and one of
97 `:code-offset', `:map', `:subset', `:superset' must be specified.
99 `:short-name'
101 VALUE must be a short string to identify the charset. If omitted,
102 NAME is used.
104 `:long-name'
106 VALUE must be a string longer than `:short-name' to identify the
107 charset. If omitted, the value of the `:short-name' attribute is used.
109 `:dimension'
111 VALUE must be an integer 0, 1, 2, or 3, specifying the dimension of
112 code-points of the charsets. If omitted, it is calculated from the
113 value of the `:code-space' attribute.
115 `:code-space'
117 VALUE must be a vector of length at most 8 specifying the byte code
118 range of each dimension in this format:
119 [ MIN-1 MAX-1 MIN-2 MAX-2 ... ]
120 where MIN-N is the minimum byte value of Nth dimension of code-point,
121 MAX-N is the maximum byte value of that.
123 `:min-code'
125 VALUE must be an integer specifying the mininum code point of the
126 charset. If omitted, it is calculated from `:code-space'. VALUE may
127 be a cons (HIGH . LOW), where HIGH is the most significant 16 bits of
128 the code point and LOW is the least significant 16 bits.
130 `:max-code'
132 VALUE must be an integer specifying the maxinum code point of the
133 charset. If omitted, it is calculated from `:code-space'. VALUE may
134 be a cons (HIGH . LOW), where HIGH is the most significant 16 bits of
135 the code point and LOW is the least significant 16 bits.
137 `:iso-final-char'
139 VALUE must be a character in the range 32 to 127 (inclusive)
140 specifying the final char of the charset for ISO-2022 encoding. If
141 omitted, the charset can't be encoded by ISO-2022 based
142 coding-systems.
144 `:iso-revision-number'
146 VALUE must be an integer in the range 0..63, specifying the revision
147 number of the charset for ISO-2022 encoding.
149 `:emacs-mule-id'
151 VALUE must be an integer of 0, 129..255. If omitted, the charset
152 can't be encoded by coding-systems of type `emacs-mule'.
154 `:ascii-compatible-p'
156 VALUE must be nil or t (default nil). If VALUE is t, the charset is
157 compatible with ASCII, i.e. the first 128 code points map to ASCII.
159 `:supplementary-p'
161 VALUE must be nil or t. If the VALUE is t, the charset is
162 supplementary, which means it is used only as a parent or a
163 subset of some other charset, or it is provided just for backward
164 compatibility.
166 `:invalid-code'
168 VALUE must be a nonnegative integer that can be used as an invalid
169 code point of the charset. If the minimum code is 0 and the maximum
170 code is greater than Emacs' maximum integer value, `:invalid-code'
171 should not be omitted.
173 `:code-offset'
175 VALUE must be an integer added to the index number of a character to
176 get the corresponding character code.
178 `:map'
180 VALUE must be vector or string.
182 If it is a vector, the format is [ CODE-1 CHAR-1 CODE-2 CHAR-2 ... ],
183 where CODE-n is a code-point of the charset, and CHAR-n is the
184 corresponding character code.
186 If it is a string, it is a name of file that contains the above
187 information. Each line of the file must be this format:
188 0xXXX 0xYYY
189 where XXX is a hexadecimal representation of CODE-n and YYY is a
190 hexadecimal representation of CHAR-n. A line starting with `#' is a
191 comment line.
193 `:subset'
195 VALUE must be a list:
196 ( PARENT MIN-CODE MAX-CODE OFFSET )
197 PARENT is a parent charset. MIN-CODE and MAX-CODE specify the range
198 of characters inherited from the parent. OFFSET is an integer value
199 to add to a code point of the parent charset to get the corresponding
200 code point of this charset.
202 `:superset'
204 VALUE must be a list of parent charsets. The charset inherits
205 characters from them. Each element of the list may be a cons (PARENT
206 . OFFSET), where PARENT is a parent charset, and OFFSET is an offset
207 value to add to a code point of PARENT to get the corresponding code
208 point of this charset.
210 `:unify-map'
212 VALUE must be vector or string.
214 If it is a vector, the format is [ CODE-1 CHAR-1 CODE-2 CHAR-2 ... ],
215 where CODE-n is a code-point of the charset, and CHAR-n is the
216 corresponding Unicode character code.
218 If it is a string, it is a name of file that contains the above
219 information. The file format is the same as what described for `:map'
220 attribute."
221 (when (vectorp (car props))
222 ;; Old style code:
223 ;; (define-charset CHARSET-ID CHARSET-SYMBOL INFO-VECTOR)
224 ;; Convert the argument to make it fit with the current style.
225 (let ((vec (car props)))
226 (setq props (convert-define-charset-argument name vec)
227 name docstring
228 docstring (aref vec 8))))
229 (let ((attrs (mapcar 'list '(:dimension
230 :code-space
231 :min-code
232 :max-code
233 :iso-final-char
234 :iso-revision-number
235 :emacs-mule-id
236 :ascii-compatible-p
237 :supplementary-p
238 :invalid-code
239 :code-offset
240 :map
241 :subset
242 :superset
243 :unify-map
244 :plist))))
246 ;; If :dimension is omitted, get the dimension from :code-space.
247 (let ((dimension (plist-get props :dimension)))
248 (or dimension
249 (let ((code-space (plist-get props :code-space)))
250 (setq dimension (if code-space (/ (length code-space) 2) 4))
251 (setq props (plist-put props :dimension dimension)))))
253 (let ((code-space (plist-get props :code-space)))
254 (or code-space
255 (let ((dimension (plist-get props :dimension)))
256 (setq code-space (make-vector 8 0))
257 (dotimes (i dimension)
258 (aset code-space (1+ (* i 2)) #xFF))
259 (setq props (plist-put props :code-space code-space)))))
261 ;; If :emacs-mule-id is specified, update emacs-mule-charset-table.
262 (let ((emacs-mule-id (plist-get props :emacs-mule-id)))
263 (if (integerp emacs-mule-id)
264 (aset emacs-mule-charset-table emacs-mule-id name)))
266 (dolist (slot attrs)
267 (setcdr slot (purecopy (plist-get props (car slot)))))
269 ;; Make sure that the value of :code-space is a vector of 8
270 ;; elements.
271 (let* ((slot (assq :code-space attrs))
272 (val (cdr slot))
273 (len (length val)))
274 (if (< len 8)
275 (setcdr slot
276 (vconcat val (make-vector (- 8 len) 0)))))
278 ;; Add :name and :docstring properties to PROPS.
279 (setq props
280 (cons :name (cons name (cons :docstring (cons (purecopy docstring) props)))))
281 (or (plist-get props :short-name)
282 (plist-put props :short-name (symbol-name name)))
283 (or (plist-get props :long-name)
284 (plist-put props :long-name (plist-get props :short-name)))
285 (plist-put props :base name)
286 ;; We can probably get a worthwhile amount in purespace.
287 (setq props
288 (mapcar (lambda (elt)
289 (if (stringp elt)
290 (purecopy elt)
291 elt))
292 props))
293 (setcdr (assq :plist attrs) props)
295 (apply 'define-charset-internal name (mapcar 'cdr attrs))))
298 (defun load-with-code-conversion (fullname file &optional noerror nomessage)
299 "Execute a file of Lisp code named FILE whose absolute name is FULLNAME.
300 The file contents are decoded before evaluation if necessary.
301 If optional third arg NOERROR is non-nil,
302 report no error if FILE doesn't exist.
303 Print messages at start and end of loading unless
304 optional fourth arg NOMESSAGE is non-nil.
305 Return t if file exists."
306 (if (null (file-readable-p fullname))
307 (and (null noerror)
308 (signal 'file-error (list "Cannot open load file" file)))
309 ;; Read file with code conversion, and then eval.
310 (let* ((buffer
311 ;; We can't use `generate-new-buffer' because files.el
312 ;; is not yet loaded.
313 (get-buffer-create (generate-new-buffer-name " *load*")))
314 (load-in-progress t)
315 (source (save-match-data (string-match "\\.el\\'" fullname))))
316 (unless nomessage
317 (if source
318 (message "Loading %s (source)..." file)
319 (message "Loading %s..." file)))
320 (when purify-flag
321 (push (purecopy file) preloaded-file-list))
322 (unwind-protect
323 (let ((load-file-name fullname)
324 (set-auto-coding-for-load t)
325 (inhibit-file-name-operation nil))
326 (with-current-buffer buffer
327 ;; So that we don't get completely screwed if the
328 ;; file is encoded in some complicated character set,
329 ;; read it with real decoding, as a multibyte buffer,
330 ;; even if this is a --unibyte Emacs session.
331 (set-buffer-multibyte t)
332 ;; Don't let deactivate-mark remain set.
333 (let (deactivate-mark)
334 (insert-file-contents fullname))
335 ;; If the loaded file was inserted with no-conversion or
336 ;; raw-text coding system, make the buffer unibyte.
337 ;; Otherwise, eval-buffer might try to interpret random
338 ;; binary junk as multibyte characters.
339 (if (and enable-multibyte-characters
340 (or (eq (coding-system-type last-coding-system-used)
341 'raw-text)))
342 (set-buffer-multibyte nil))
343 ;; Make `kill-buffer' quiet.
344 (set-buffer-modified-p nil))
345 ;; Have the original buffer current while we eval.
346 (eval-buffer buffer nil
347 ;; This is compatible with what `load' does.
348 (if purify-flag file fullname)
349 ;; If this Emacs is running with --unibyte,
350 ;; convert multibyte strings to unibyte
351 ;; after reading them.
352 ;; (not (default-value 'enable-multibyte-characters))
353 nil t
355 (let (kill-buffer-hook kill-buffer-query-functions)
356 (kill-buffer buffer)))
357 (do-after-load-evaluation fullname)
359 (unless (or nomessage noninteractive)
360 (if source
361 (message "Loading %s (source)...done" file)
362 (message "Loading %s...done" file)))
363 t)))
365 (defun charset-info (charset)
366 "Return a vector of information of CHARSET.
367 This function is provided for backward compatibility.
369 The elements of the vector are:
370 CHARSET-ID, BYTES, DIMENSION, CHARS, WIDTH, DIRECTION,
371 LEADING-CODE-BASE, LEADING-CODE-EXT,
372 ISO-FINAL-CHAR, ISO-GRAPHIC-PLANE,
373 REVERSE-CHARSET, SHORT-NAME, LONG-NAME, DESCRIPTION,
374 PLIST.
375 where
376 CHARSET-ID is always 0.
377 BYTES is always 0.
378 DIMENSION is the number of bytes of a code-point of the charset:
379 1, 2, 3, or 4.
380 CHARS is the number of characters in a dimension:
381 94, 96, 128, or 256.
382 WIDTH is always 0.
383 DIRECTION is always 0.
384 LEADING-CODE-BASE is always 0.
385 LEADING-CODE-EXT is always 0.
386 ISO-FINAL-CHAR (character) is the final character of the
387 corresponding ISO 2022 charset. If the charset is not assigned
388 any final character, the value is -1.
389 ISO-GRAPHIC-PLANE is always 0.
390 REVERSE-CHARSET is always -1.
391 SHORT-NAME (string) is the short name to refer to the charset.
392 LONG-NAME (string) is the long name to refer to the charset
393 DESCRIPTION (string) is the description string of the charset.
394 PLIST (property list) may contain any type of information a user
395 want to put and get by functions `put-charset-property' and
396 `get-charset-property' respectively."
397 (vector 0
399 (charset-dimension charset)
400 (charset-chars charset)
405 (charset-iso-final-char charset)
408 (get-charset-property charset :short-name)
409 (get-charset-property charset :short-name)
410 (charset-description charset)
411 (charset-plist charset)))
413 ;; It is better not to use backquote in this file,
414 ;; because that makes a bootstrapping problem
415 ;; if you need to recompile all the Lisp files using interpreted code.
417 (defun charset-id (charset)
418 "Always return 0. This is provided for backward compatibility."
420 (make-obsolete 'charset-id "do not use it." "23.1")
422 (defmacro charset-bytes (charset)
423 "Always return 0. This is provided for backward compatibility."
425 (make-obsolete 'charset-bytes "do not use it." "23.1")
427 (defun get-charset-property (charset propname)
428 "Return the value of CHARSET's PROPNAME property.
429 This is the last value stored with
430 (put-charset-property CHARSET PROPNAME VALUE)."
431 (plist-get (charset-plist charset) propname))
433 (defun put-charset-property (charset propname value)
434 "Set CHARSETS's PROPNAME property to value VALUE.
435 It can be retrieved with `(get-charset-property CHARSET PROPNAME)'."
436 (set-charset-plist charset
437 (plist-put (charset-plist charset) propname
438 (if (stringp value)
439 (purecopy value)
440 value))))
442 (defun charset-description (charset)
443 "Return description string of CHARSET."
444 (plist-get (charset-plist charset) :docstring))
446 (defun charset-dimension (charset)
447 "Return dimension of CHARSET."
448 (plist-get (charset-plist charset) :dimension))
450 (defun charset-chars (charset &optional dimension)
451 "Return number of characters contained in DIMENSION of CHARSET.
452 DIMENSION defaults to the first dimension."
453 (unless dimension (setq dimension 1))
454 (let ((code-space (plist-get (charset-plist charset) :code-space)))
455 (1+ (- (aref code-space (1- (* 2 dimension)))
456 (aref code-space (- (* 2 dimension) 2))))))
458 (defun charset-iso-final-char (charset)
459 "Return ISO-2022 final character of CHARSET.
460 Return -1 if charset isn't an ISO 2022 one."
461 (or (plist-get (charset-plist charset) :iso-final-char)
462 -1))
464 (defmacro charset-short-name (charset)
465 "Return short name of CHARSET."
466 (plist-get (charset-plist charset) :short-name))
468 (defmacro charset-long-name (charset)
469 "Return long name of CHARSET."
470 (plist-get (charset-plist charset) :long-name))
472 (defun charset-list ()
473 "Return list of all charsets ever defined."
474 charset-list)
475 (make-obsolete 'charset-list "use variable `charset-list'." "23.1")
478 ;;; CHARACTER
479 (define-obsolete-function-alias 'char-valid-p 'characterp "23.1")
481 (defun generic-char-p (char)
482 "Always return nil. This is provided for backward compatibility."
483 nil)
484 (make-obsolete 'generic-char-p "generic characters no longer exist." "23.1")
486 (defun make-char-internal (charset-id &optional code1 code2)
487 (let ((charset (aref emacs-mule-charset-table charset-id)))
488 (or charset
489 (error "Invalid Emacs-mule charset ID: %d" charset-id))
490 (make-char charset code1 code2)))
492 ;; Save the ASCII case table in case we need it later. Some locales
493 ;; (such as Turkish) modify the case behavior of ASCII characters,
494 ;; which can interfere with networking code that uses ASCII strings.
496 (defvar ascii-case-table
497 ;; Code copied from copy-case-table to avoid requiring case-table.el
498 (let ((tbl (copy-sequence (standard-case-table)))
499 (up (char-table-extra-slot (standard-case-table) 0)))
500 (if up (set-char-table-extra-slot tbl 0 (copy-sequence up)))
501 (set-char-table-extra-slot tbl 1 nil)
502 (set-char-table-extra-slot tbl 2 nil)
503 tbl)
504 "Case table for the ASCII character set.")
506 ;; Coding system stuff
508 ;; Coding system is a symbol that has been defined by the function
509 ;; `define-coding-system'.
511 (defconst coding-system-iso-2022-flags
512 '(long-form
513 ascii-at-eol
514 ascii-at-cntl
515 7-bit
516 locking-shift
517 single-shift
518 designation
519 revision
520 direction
521 init-at-bol
522 designate-at-bol
523 safe
524 latin-extra
525 composition
526 euc-tw-shift
527 use-roman
528 use-oldjis)
529 "List of symbols that control ISO-2022 encoder/decoder.
531 The value of the `:flags' attribute in the argument of the function
532 `define-coding-system' must be one of them.
534 If `long-form' is specified, use a long designation sequence on
535 encoding for the charsets `japanese-jisx0208-1978', `chinese-gb2312',
536 and `japanese-jisx0208'. The long designation sequence doesn't
537 conform to ISO 2022, but is used by such coding systems as
538 `compound-text'.
540 If `ascii-at-eol' is specified, designate ASCII to g0 at end of line
541 on encoding.
543 If `ascii-at-cntl' is specified, designate ASCII to g0 before control
544 codes and SPC on encoding.
546 If `7-bit' is specified, use 7-bit code only on encoding.
548 If `locking-shift' is specified, decode locking-shift code correctly
549 on decoding, and use locking-shift to invoke a graphic element on
550 encoding.
552 If `single-shift' is specified, decode single-shift code correctly on
553 decoding, and use single-shift to invoke a graphic element on encoding.
555 If `designation' is specified, decode designation code correctly on
556 decoding, and use designation to designate a charset to a graphic
557 element on encoding.
559 If `revision' is specified, produce an escape sequence to specify
560 revision number of a charset on encoding. Such an escape sequence is
561 always correctly decoded on decoding.
563 If `direction' is specified, decode ISO6429's code for specifying
564 direction correctly, and produce the code on encoding.
566 If `init-at-bol' is specified, on encoding, it is assumed that
567 invocation and designation statuses are reset at each beginning of
568 line even if `ascii-at-eol' is not specified; thus no codes for
569 resetting them are produced.
571 If `safe' is specified, on encoding, characters not supported by a
572 coding are replaced with `?'.
574 If `latin-extra' is specified, the code-detection routine assumes that a
575 code specified in `latin-extra-code-table' (which see) is valid.
577 If `composition' is specified, an escape sequence to specify
578 composition sequence is correctly decoded on decoding, and is produced
579 on encoding.
581 If `euc-tw-shift' is specified, the EUC-TW specific shifting code is
582 correctly decoded on decoding, and is produced on encoding.
584 If `use-roman' is specified, JIS0201-1976-Roman is designated instead
585 of ASCII.
587 If `use-oldjis' is specified, JIS0208-1976 is designated instead of
588 JIS0208-1983.")
590 (defun define-coding-system (name docstring &rest props)
591 "Define NAME (a symbol) as a coding system with DOCSTRING and attributes.
592 The remaining arguments must come in pairs ATTRIBUTE VALUE. ATTRIBUTE
593 may be any symbol.
595 The following attributes have special meanings. Those labeled as
596 \"(required)\" should not be omitted.
598 `:mnemonic' (required)
600 VALUE is a character to display on mode line for the coding system.
602 `:coding-type' (required)
604 VALUE must be one of `charset', `utf-8', `utf-16', `iso-2022',
605 `emacs-mule', `shift-jis', `ccl', `raw-text', `undecided'.
607 `:eol-type'
609 VALUE is the EOL (end-of-line) format of the coding system. It must be
610 one of `unix', `dos', `mac'. The symbol `unix' means Unix-like EOL
611 \(i.e. single LF), `dos' means DOS-like EOL \(i.e. sequence of CR LF),
612 and `mac' means Mac-like EOL \(i.e. single CR). If omitted, on
613 decoding by the coding system, Emacs automatically detects the EOL
614 format of the source text.
616 `:charset-list'
618 VALUE must be a list of charsets supported by the coding system. On
619 encoding by the coding system, if a character belongs to multiple
620 charsets in the list, a charset that comes earlier in the list is
621 selected. If `:coding-type' is `iso-2022', VALUE may be `iso-2022',
622 which indicates that the coding system supports all ISO-2022 based
623 charsets. If `:coding-type' is `emacs-mule', VALUE may be
624 `emacs-mule', which indicates that the coding system supports all
625 charsets that have the `:emacs-mule-id' property.
627 `:ascii-compatible-p'
629 If VALUE is non-nil, the coding system decodes all 7-bit bytes into
630 the corresponding ASCII characters, and encodes all ASCII characters
631 back to the corresponding 7-bit bytes. VALUE defaults to nil.
633 `:decode-translation-table'
635 VALUE must be a translation table to use on decoding.
637 `:encode-translation-table'
639 VALUE must be a translation table to use on encoding.
641 `:post-read-conversion'
643 VALUE must be a function to call after some text is inserted and
644 decoded by the coding system itself and before any functions in
645 `after-insert-functions' are called. This function is passed one
646 argument; the number of characters in the text to convert, with
647 point at the start of the text. The function should leave point
648 the same, and return the new character count.
650 `:pre-write-conversion'
652 VALUE must be a function to call after all functions in
653 `write-region-annotate-functions' and `buffer-file-format' are
654 called, and before the text is encoded by the coding system
655 itself. This function should convert the whole text in the
656 current buffer. For backward compatibility, this function is
657 passed two arguments which can be ignored.
659 `:default-char'
661 VALUE must be a character. On encoding, a character not supported by
662 the coding system is replaced with VALUE.
664 `:for-unibyte'
666 VALUE non-nil means that visiting a file with the coding system
667 results in a unibyte buffer.
669 `:eol-type'
671 VALUE must be `unix', `dos', `mac'. The symbol `unix' means Unix-like
672 EOL (LF), `dos' means DOS-like EOL (CRLF), and `mac' means Mac-like
673 EOL (CR). If omitted, on decoding, the coding system detects EOL
674 format automatically, and on encoding, uses Unix-like EOL.
676 `:mime-charset'
678 VALUE must be a symbol whose name is that of a MIME charset converted
679 to lower case.
681 `:mime-text-unsuitable'
683 VALUE non-nil means the `:mime-charset' property names a charset which
684 is unsuitable for the top-level media type \"text\".
686 `:flags'
688 VALUE must be a list of symbols that control the ISO-2022 converter.
689 Each must be a member of the list `coding-system-iso-2022-flags'
690 \(which see). This attribute has a meaning only when `:coding-type'
691 is `iso-2022'.
693 `:designation'
695 VALUE must be a vector [G0-USAGE G1-USAGE G2-USAGE G3-USAGE].
696 GN-USAGE specifies the usage of graphic register GN as follows.
698 If it is nil, no charset can be designated to GN.
700 If it is a charset, the charset is initially designated to GN, and
701 never used by the other charsets.
703 If it is a list, the elements must be charsets, nil, 94, or 96. GN
704 can be used by all the listed charsets. If the list contains 94, any
705 iso-2022 charset whose code-space ranges are 94 long can be designated
706 to GN. If the list contains 96, any charsets whose whose ranges are
707 96 long can be designated to GN. If the first element is a charset,
708 that charset is initially designated to GN.
710 This attribute has a meaning only when `:coding-type' is `iso-2022'.
712 `:bom'
714 This attributes specifies whether the coding system uses a `byte order
715 mark'. VALUE must be nil, t, or cons of coding systems whose
716 `:coding-type' is `utf-16' or `utf-8'.
718 If the value is nil, on decoding, don't treat the first two-byte as
719 BOM, and on encoding, don't produce BOM bytes.
721 If the value is t, on decoding, skip the first two-byte as BOM, and on
722 encoding, produce BOM bytes accoding to the value of `:endian'.
724 If the value is cons, on decoding, check the first two-byte. If they
725 are 0xFE 0xFF, use the car part coding system of the value. If they
726 are 0xFF 0xFE, use the cdr part coding system of the value.
727 Otherwise, treat them as bytes for a normal character. On encoding,
728 produce BOM bytes accoding to the value of `:endian'.
730 This attribute has a meaning only when `:coding-type' is `utf-16' or
731 `utf-8'.
733 `:endian'
735 VALUE must be `big' or `little' specifying big-endian and
736 little-endian respectively. The default value is `big'.
738 This attribute has a meaning only when `:coding-type' is `utf-16'.
740 `:ccl-decoder'
742 VALUE is a symbol representing the registered CCL program used for
743 decoding. This attribute has a meaning only when `:coding-type' is
744 `ccl'.
746 `:ccl-encoder'
748 VALUE is a symbol representing the registered CCL program used for
749 encoding. This attribute has a meaning only when `:coding-type' is
750 `ccl'."
751 (let* ((common-attrs (mapcar 'list
752 '(:mnemonic
753 :coding-type
754 :charset-list
755 :ascii-compatible-p
756 :decode-translation-table
757 :encode-translation-table
758 :post-read-conversion
759 :pre-write-conversion
760 :default-char
761 :for-unibyte
762 :plist
763 :eol-type)))
764 (coding-type (plist-get props :coding-type))
765 (spec-attrs (mapcar 'list
766 (cond ((eq coding-type 'iso-2022)
767 '(:initial
768 :reg-usage
769 :request
770 :flags))
771 ((eq coding-type 'utf-8)
772 '(:bom))
773 ((eq coding-type 'utf-16)
774 '(:bom
775 :endian))
776 ((eq coding-type 'ccl)
777 '(:ccl-decoder
778 :ccl-encoder
779 :valids))))))
781 (dolist (slot common-attrs)
782 (setcdr slot (plist-get props (car slot))))
784 (dolist (slot spec-attrs)
785 (setcdr slot (plist-get props (car slot))))
787 (if (eq coding-type 'iso-2022)
788 (let ((designation (plist-get props :designation))
789 (flags (plist-get props :flags))
790 (initial (make-vector 4 nil))
791 (reg-usage (cons 4 4))
792 request elt)
793 (dotimes (i 4)
794 (setq elt (aref designation i))
795 (cond ((charsetp elt)
796 (aset initial i elt)
797 (setq request (cons (cons elt i) request)))
798 ((consp elt)
799 (aset initial i (car elt))
800 (if (charsetp (car elt))
801 (setq request (cons (cons (car elt) i) request)))
802 (dolist (e (cdr elt))
803 (cond ((charsetp e)
804 (setq request (cons (cons e i) request)))
805 ((eq e 94)
806 (setcar reg-usage i))
807 ((eq e 96)
808 (setcdr reg-usage i))
809 ((eq e t)
810 (setcar reg-usage i)
811 (setcdr reg-usage i)))))))
812 (setcdr (assq :initial spec-attrs) initial)
813 (setcdr (assq :reg-usage spec-attrs) reg-usage)
814 (setcdr (assq :request spec-attrs) request)
816 ;; Change :flags value from a list to a bit-mask.
817 (let ((bits 0)
818 (i 0))
819 (dolist (elt coding-system-iso-2022-flags)
820 (if (memq elt flags)
821 (setq bits (logior bits (lsh 1 i))))
822 (setq i (1+ i)))
823 (setcdr (assq :flags spec-attrs) bits))))
825 ;; Add :name and :docstring properties to PROPS.
826 (setq props
827 (cons :name (cons name (cons :docstring (cons (purecopy docstring)
828 props)))))
829 (setcdr (assq :plist common-attrs) props)
830 (apply 'define-coding-system-internal
831 name (mapcar 'cdr (append common-attrs spec-attrs)))))
833 (defun coding-system-doc-string (coding-system)
834 "Return the documentation string for CODING-SYSTEM."
835 (plist-get (coding-system-plist coding-system) :docstring))
837 (defun coding-system-mnemonic (coding-system)
838 "Return the mnemonic character of CODING-SYSTEM.
839 The mnemonic character of a coding system is used in mode line to
840 indicate the coding system. If CODING-SYSTEM is nil, return ?=."
841 (plist-get (coding-system-plist coding-system) :mnemonic))
843 (defun coding-system-type (coding-system)
844 "Return the coding type of CODING-SYSTEM.
845 A coding type is a symbol indicating the encoding method of CODING-SYSTEM.
846 See the function `define-coding-system' for more detail."
847 (plist-get (coding-system-plist coding-system) :coding-type))
849 (defun coding-system-charset-list (coding-system)
850 "Return list of charsets supported by CODING-SYSTEM.
851 If CODING-SYSTEM supports all ISO-2022 charsets, return `iso-2022'.
852 If CODING-SYSTEM supports all emacs-mule charsets, return `emacs-mule'."
853 (plist-get (coding-system-plist coding-system) :charset-list))
855 (defun coding-system-category (coding-system)
856 "Return a category symbol of CODING-SYSTEM."
857 (plist-get (coding-system-plist coding-system) :category))
859 (defun coding-system-get (coding-system prop)
860 "Extract a value from CODING-SYSTEM's property list for property PROP.
861 For compatibility with Emacs 20/21, this accepts old-style symbols
862 like `mime-charset' as well as the current style like `:mime-charset'."
863 (or (plist-get (coding-system-plist coding-system) prop)
864 (if (not (keywordp prop))
865 ;; For backward compatibility.
866 (if (eq prop 'ascii-incompatible)
867 (not (plist-get (coding-system-plist coding-system)
868 :ascii-compatible-p))
869 (plist-get (coding-system-plist coding-system)
870 (intern (concat ":" (symbol-name prop))))))))
872 (defun coding-system-eol-type-mnemonic (coding-system)
873 "Return the string indicating end-of-line format of CODING-SYSTEM."
874 (let* ((eol-type (coding-system-eol-type coding-system))
875 (val (cond ((eq eol-type 0) eol-mnemonic-unix)
876 ((eq eol-type 1) eol-mnemonic-dos)
877 ((eq eol-type 2) eol-mnemonic-mac)
878 (t eol-mnemonic-undecided))))
879 (if (stringp val)
881 (char-to-string val))))
883 (defun coding-system-lessp (x y)
884 (cond ((eq x 'no-conversion) t)
885 ((eq y 'no-conversion) nil)
886 ((eq x 'emacs-mule) t)
887 ((eq y 'emacs-mule) nil)
888 ((eq x 'undecided) t)
889 ((eq y 'undecided) nil)
890 (t (let ((c1 (coding-system-mnemonic x))
891 (c2 (coding-system-mnemonic y)))
892 (or (< (downcase c1) (downcase c2))
893 (and (not (> (downcase c1) (downcase c2)))
894 (< c1 c2)))))))
896 (defun coding-system-equal (coding-system-1 coding-system-2)
897 "Return t if and only if CODING-SYSTEM-1 and CODING-SYSTEM-2 are identical.
898 Two coding systems are identical if both symbols are equal
899 or one is an alias of the other."
900 (or (eq coding-system-1 coding-system-2)
901 (and (equal (coding-system-plist coding-system-1)
902 (coding-system-plist coding-system-2))
903 (let ((eol-type-1 (coding-system-eol-type coding-system-1))
904 (eol-type-2 (coding-system-eol-type coding-system-2)))
905 (or (eq eol-type-1 eol-type-2)
906 (and (vectorp eol-type-1) (vectorp eol-type-2)))))))
908 (defun add-to-coding-system-list (coding-system)
909 "Add CODING-SYSTEM to `coding-system-list' while keeping it sorted."
910 (if (or (null coding-system-list)
911 (coding-system-lessp coding-system (car coding-system-list)))
912 (setq coding-system-list (cons coding-system coding-system-list))
913 (let ((len (length coding-system-list))
914 mid (tem coding-system-list))
915 (while (> len 1)
916 (setq mid (nthcdr (/ len 2) tem))
917 (if (coding-system-lessp (car mid) coding-system)
918 (setq tem mid
919 len (- len (/ len 2)))
920 (setq len (/ len 2))))
921 (setcdr tem (cons coding-system (cdr tem))))))
923 (defun coding-system-list (&optional base-only)
924 "Return a list of all existing non-subsidiary coding systems.
925 If optional arg BASE-ONLY is non-nil, only base coding systems are
926 listed. The value doesn't include subsidiary coding systems which are
927 made from bases and aliases automatically for various end-of-line
928 formats (e.g. iso-latin-1-unix, koi8-r-dos)."
929 (let ((codings nil))
930 (dolist (coding coding-system-list)
931 (if (eq (coding-system-base coding) coding)
932 (if base-only
933 (setq codings (cons coding codings))
934 (dolist (alias (coding-system-aliases coding))
935 (setq codings (cons alias codings))))))
936 codings))
938 (defconst char-coding-system-table nil
939 "It exists just for backward compatibility, and the value is always nil.")
940 (make-obsolete-variable 'char-coding-system-table nil "23.1")
942 (defun transform-make-coding-system-args (name type &optional doc-string props)
943 "For internal use only.
944 Transform XEmacs style args for `make-coding-system' to Emacs style.
945 Value is a list of transformed arguments."
946 (let ((mnemonic (string-to-char (or (plist-get props 'mnemonic) "?")))
947 (eol-type (plist-get props 'eol-type))
948 properties tmp)
949 (cond
950 ((eq eol-type 'lf) (setq eol-type 'unix))
951 ((eq eol-type 'crlf) (setq eol-type 'dos))
952 ((eq eol-type 'cr) (setq eol-type 'mac)))
953 (if (setq tmp (plist-get props 'post-read-conversion))
954 (setq properties (plist-put properties 'post-read-conversion tmp)))
955 (if (setq tmp (plist-get props 'pre-write-conversion))
956 (setq properties (plist-put properties 'pre-write-conversion tmp)))
957 (cond
958 ((eq type 'shift-jis)
959 `(,name 1 ,mnemonic ,doc-string () ,properties ,eol-type))
960 ((eq type 'iso2022) ; This is not perfect.
961 (if (plist-get props 'escape-quoted)
962 (error "escape-quoted is not supported: %S"
963 `(,name ,type ,doc-string ,props)))
964 (let ((g0 (plist-get props 'charset-g0))
965 (g1 (plist-get props 'charset-g1))
966 (g2 (plist-get props 'charset-g2))
967 (g3 (plist-get props 'charset-g3))
968 (use-roman
969 (and
970 (eq (cadr (assoc 'latin-jisx0201
971 (plist-get props 'input-charset-conversion)))
972 'ascii)
973 (eq (cadr (assoc 'ascii
974 (plist-get props 'output-charset-conversion)))
975 'latin-jisx0201)))
976 (use-oldjis
977 (and
978 (eq (cadr (assoc 'japanese-jisx0208-1978
979 (plist-get props 'input-charset-conversion)))
980 'japanese-jisx0208)
981 (eq (cadr (assoc 'japanese-jisx0208
982 (plist-get props 'output-charset-conversion)))
983 'japanese-jisx0208-1978))))
984 (if (charsetp g0)
985 (if (plist-get props 'force-g0-on-output)
986 (setq g0 `(nil ,g0))
987 (setq g0 `(,g0 t))))
988 (if (charsetp g1)
989 (if (plist-get props 'force-g1-on-output)
990 (setq g1 `(nil ,g1))
991 (setq g1 `(,g1 t))))
992 (if (charsetp g2)
993 (if (plist-get props 'force-g2-on-output)
994 (setq g2 `(nil ,g2))
995 (setq g2 `(,g2 t))))
996 (if (charsetp g3)
997 (if (plist-get props 'force-g3-on-output)
998 (setq g3 `(nil ,g3))
999 (setq g3 `(,g3 t))))
1000 `(,name 2 ,mnemonic ,doc-string
1001 (,g0 ,g1 ,g2 ,g3
1002 ,(plist-get props 'short)
1003 ,(not (plist-get props 'no-ascii-eol))
1004 ,(not (plist-get props 'no-ascii-cntl))
1005 ,(plist-get props 'seven)
1007 ,(not (plist-get props 'lock-shift))
1008 ,use-roman
1009 ,use-oldjis
1010 ,(plist-get props 'no-iso6429)
1011 nil nil nil nil)
1012 ,properties ,eol-type)))
1013 ((eq type 'big5)
1014 `(,name 3 ,mnemonic ,doc-string () ,properties ,eol-type))
1015 ((eq type 'ccl)
1016 `(,name 4 ,mnemonic ,doc-string
1017 (,(plist-get props 'decode) . ,(plist-get props 'encode))
1018 ,properties ,eol-type))
1020 (error "unsupported XEmacs style make-coding-style arguments: %S"
1021 `(,name ,type ,doc-string ,props))))))
1023 (defun make-coding-system (coding-system type mnemonic doc-string
1024 &optional
1025 flags
1026 properties
1027 eol-type)
1028 "Define a new coding system CODING-SYSTEM (symbol).
1029 This function is provided for backward compatibility."
1030 ;; For compatibility with XEmacs, we check the type of TYPE. If it
1031 ;; is a symbol, perhaps, this function is called with XEmacs-style
1032 ;; arguments. Here, try to transform that kind of arguments to
1033 ;; Emacs style.
1034 (if (symbolp type)
1035 (let ((args (transform-make-coding-system-args coding-system type
1036 mnemonic doc-string)))
1037 (setq coding-system (car args)
1038 type (nth 1 args)
1039 mnemonic (nth 2 args)
1040 doc-string (nth 3 args)
1041 flags (nth 4 args)
1042 properties (nth 5 args)
1043 eol-type (nth 6 args))))
1045 (setq type
1046 (cond ((eq type 0) 'emacs-mule)
1047 ((eq type 1) 'shift-jis)
1048 ((eq type 2) 'iso2022)
1049 ((eq type 3) 'big5)
1050 ((eq type 4) 'ccl)
1051 ((eq type 5) 'raw-text)
1053 (error "Invalid coding system type: %s" type))))
1055 (setq properties
1056 (let ((plist nil) key)
1057 (dolist (elt properties)
1058 (setq key (car elt))
1059 (cond ((eq key 'post-read-conversion)
1060 (setq key :post-read-conversion))
1061 ((eq key 'pre-write-conversion)
1062 (setq key :pre-write-conversion))
1063 ((eq key 'translation-table-for-decode)
1064 (setq key :decode-translation-table))
1065 ((eq key 'translation-table-for-encode)
1066 (setq key :encode-translation-table))
1067 ((eq key 'safe-charsets)
1068 (setq key :charset-list))
1069 ((eq key 'mime-charset)
1070 (setq key :mime-charset))
1071 ((eq key 'valid-codes)
1072 (setq key :valids)))
1073 (setq plist (plist-put plist key (cdr elt))))
1074 plist))
1075 (setq properties (plist-put properties :mnemonic mnemonic))
1076 (plist-put properties :coding-type type)
1077 (cond ((eq eol-type 0) (setq eol-type 'unix))
1078 ((eq eol-type 1) (setq eol-type 'dos))
1079 ((eq eol-type 2) (setq eol-type 'mac))
1080 ((vectorp eol-type) (setq eol-type nil)))
1081 (plist-put properties :eol-type eol-type)
1083 (cond
1084 ((eq type 'iso2022)
1085 (plist-put properties :flags
1086 (list (and (or (consp (nth 0 flags))
1087 (consp (nth 1 flags))
1088 (consp (nth 2 flags))
1089 (consp (nth 3 flags))) 'designation)
1090 (or (nth 4 flags) 'long-form)
1091 (and (nth 5 flags) 'ascii-at-eol)
1092 (and (nth 6 flags) 'ascii-at-cntl)
1093 (and (nth 7 flags) '7-bit)
1094 (and (nth 8 flags) 'locking-shift)
1095 (and (nth 9 flags) 'single-shift)
1096 (and (nth 10 flags) 'use-roman)
1097 (and (nth 11 flags) 'use-oldjis)
1098 (or (nth 12 flags) 'direction)
1099 (and (nth 13 flags) 'init-at-bol)
1100 (and (nth 14 flags) 'designate-at-bol)
1101 (and (nth 15 flags) 'safe)
1102 (and (nth 16 flags) 'latin-extra)))
1103 (plist-put properties :designation
1104 (let ((vec (make-vector 4 nil)))
1105 (dotimes (i 4)
1106 (let ((spec (nth i flags)))
1107 (if (eq spec t)
1108 (aset vec i '(94 96))
1109 (if (consp spec)
1110 (progn
1111 (if (memq t spec)
1112 (setq spec (append (delq t spec) '(94 96))))
1113 (aset vec i spec))))))
1114 vec)))
1116 ((eq type 'ccl)
1117 (plist-put properties :ccl-decoder (car flags))
1118 (plist-put properties :ccl-encoder (cdr flags))))
1120 (apply 'define-coding-system coding-system doc-string properties))
1122 (make-obsolete 'make-coding-system 'define-coding-system "23.1")
1124 (defun merge-coding-systems (first second)
1125 "Fill in any unspecified aspects of coding system FIRST from SECOND.
1126 Return the resulting coding system."
1127 (let ((base (coding-system-base second))
1128 (eol (coding-system-eol-type second)))
1129 ;; If FIRST doesn't specify text conversion, merge with that of SECOND.
1130 (if (eq (coding-system-base first) 'undecided)
1131 (setq first (coding-system-change-text-conversion first base)))
1132 ;; If FIRST doesn't specify eol conversion, merge with that of SECOND.
1133 (if (and (vectorp (coding-system-eol-type first))
1134 (numberp eol) (>= eol 0) (<= eol 2))
1135 (setq first (coding-system-change-eol-conversion
1136 first eol)))
1137 first))
1139 (defun autoload-coding-system (symbol form)
1140 "Define SYMBOL as a coding-system that is defined on demand.
1142 FORM is a form to evaluate to define the coding-system."
1143 (put symbol 'coding-system-define-form form)
1144 (setq coding-system-alist (cons (list (symbol-name symbol))
1145 coding-system-alist))
1146 (dolist (elt '("-unix" "-dos" "-mac"))
1147 (let ((name (concat (symbol-name symbol) elt)))
1148 (put (intern name) 'coding-system-define-form form)
1149 (setq coding-system-alist (cons (list name) coding-system-alist)))))
1151 ;; This variable is set in these three cases:
1152 ;; (1) A file is read by a coding system specified explicitly.
1153 ;; after-insert-file-set-coding sets the car of this value to
1154 ;; coding-system-for-read, and sets the cdr to nil.
1155 ;; (2) A buffer is saved.
1156 ;; After writing, basic-save-buffer-1 sets the car of this value
1157 ;; to last-coding-system-used.
1158 ;; (3) set-buffer-file-coding-system is called.
1159 ;; The cdr of this value is set to the specified coding system.
1160 ;; This variable is used for decoding in revert-buffer and encoding in
1161 ;; select-safe-coding-system.
1162 (defvar buffer-file-coding-system-explicit nil
1163 "The file coding system explicitly specified for the current buffer.
1164 The value is a cons of coding systems for reading (decoding) and
1165 writing (encoding).
1166 Internal use only.")
1167 (make-variable-buffer-local 'buffer-file-coding-system-explicit)
1168 (put 'buffer-file-coding-system-explicit 'permanent-local t)
1170 (defun set-buffer-file-coding-system (coding-system &optional force nomodify)
1171 "Set the file coding-system of the current buffer to CODING-SYSTEM.
1172 This means that when you save the buffer, it will be converted
1173 according to CODING-SYSTEM. For a list of possible values of
1174 CODING-SYSTEM, use \\[list-coding-systems].
1176 If CODING-SYSTEM leaves the text conversion unspecified, or if it leaves
1177 the end-of-line conversion unspecified, FORCE controls what to do.
1178 If FORCE is nil, get the unspecified aspect (or aspects) from the buffer's
1179 previous `buffer-file-coding-system' value (if it is specified there).
1180 Otherwise, leave it unspecified.
1182 This marks the buffer modified so that the succeeding \\[save-buffer]
1183 surely saves the buffer with CODING-SYSTEM. From a program, if you
1184 don't want to mark the buffer modified, specify t for NOMODIFY.
1185 If you know exactly what coding system you want to use,
1186 just set the variable `buffer-file-coding-system' directly."
1187 (interactive "zCoding system for saving file (default nil): \nP")
1188 (check-coding-system coding-system)
1189 (if (and coding-system buffer-file-coding-system (null force))
1190 (setq coding-system
1191 (merge-coding-systems coding-system buffer-file-coding-system)))
1192 (setq buffer-file-coding-system coding-system)
1193 (if buffer-file-coding-system-explicit
1194 (setcdr buffer-file-coding-system-explicit coding-system)
1195 (setq buffer-file-coding-system-explicit (cons nil coding-system)))
1196 ;; This is in case of an explicit call. Normally, `normal-mode' and
1197 ;; `set-buffer-major-mode-hook' take care of setting the table.
1198 (if (fboundp 'ucs-set-table-for-input) ; don't lose when building
1199 (ucs-set-table-for-input))
1200 (unless nomodify
1201 (set-buffer-modified-p t))
1202 (force-mode-line-update))
1204 (defun revert-buffer-with-coding-system (coding-system &optional force)
1205 "Visit the current buffer's file again using coding system CODING-SYSTEM.
1206 For a list of possible values of CODING-SYSTEM, use \\[list-coding-systems].
1208 If CODING-SYSTEM leaves the text conversion unspecified, or if it leaves
1209 the end-of-line conversion unspecified, FORCE controls what to do.
1210 If FORCE is nil, get the unspecified aspect (or aspects) from the buffer's
1211 previous `buffer-file-coding-system' value (if it is specified there).
1212 Otherwise, determine it from the file contents as usual for visiting a file."
1213 (interactive "zCoding system for visited file (default nil): \nP")
1214 (check-coding-system coding-system)
1215 (if (and coding-system buffer-file-coding-system (null force))
1216 (setq coding-system
1217 (merge-coding-systems coding-system buffer-file-coding-system)))
1218 (let ((coding-system-for-read coding-system))
1219 (revert-buffer)))
1221 (defun set-file-name-coding-system (coding-system)
1222 "Set coding system for decoding and encoding file names to CODING-SYSTEM.
1223 It actually just set the variable `file-name-coding-system' (which see)
1224 to CODING-SYSTEM."
1225 (interactive "zCoding system for file names (default nil): ")
1226 (check-coding-system coding-system)
1227 (if (and coding-system
1228 (not (coding-system-get coding-system :ascii-compatible-p))
1229 (not (coding-system-get coding-system :suitable-for-file-name)))
1230 (error "%s is not suitable for file names" coding-system))
1231 (setq file-name-coding-system coding-system))
1233 (defvar default-terminal-coding-system nil
1234 "Default value for the terminal coding system.
1235 This is normally set according to the selected language environment.
1236 See also the command `set-terminal-coding-system'.")
1238 (defun set-terminal-coding-system (coding-system &optional terminal)
1239 "Set coding system of terminal output to CODING-SYSTEM.
1240 All text output to TERMINAL will be encoded
1241 with the specified coding system.
1243 For a list of possible values of CODING-SYSTEM, use \\[list-coding-systems].
1244 The default is determined by the selected language environment
1245 or by the previous use of this command.
1247 TERMINAL may be a terminal object, a frame, or nil for the
1248 selected frame's terminal. The setting has no effect on
1249 graphical terminals."
1250 (interactive
1251 (list (let ((default (if (and (not (terminal-coding-system))
1252 default-terminal-coding-system)
1253 default-terminal-coding-system)))
1254 (read-coding-system
1255 (format "Coding system for terminal display (default %s): "
1256 default)
1257 default))))
1258 (if (and (not coding-system)
1259 (not (terminal-coding-system)))
1260 (setq coding-system default-terminal-coding-system))
1261 (if coding-system
1262 (setq default-terminal-coding-system coding-system))
1263 (set-terminal-coding-system-internal coding-system terminal)
1264 (redraw-frame (selected-frame)))
1266 (defvar default-keyboard-coding-system nil
1267 "Default value of the keyboard coding system.
1268 This is normally set according to the selected language environment.
1269 See also the command `set-keyboard-coding-system'.")
1271 (defun set-keyboard-coding-system (coding-system &optional terminal)
1272 "Set coding system for keyboard input on TERMINAL to CODING-SYSTEM.
1274 For a list of possible values of CODING-SYSTEM, use \\[list-coding-systems].
1275 The default is determined by the selected language environment
1276 or by the previous use of this command.
1278 If CODING-SYSTEM is nil or the coding-type of CODING-SYSTEM is
1279 `raw-text', the decoding of keyboard input is disabled.
1281 TERMINAL may be a terminal object, a frame, or nil for the
1282 selected frame's terminal. The setting has no effect on
1283 graphical terminals."
1284 (interactive
1285 (list (let* ((coding (keyboard-coding-system nil))
1286 (default (if (eq (coding-system-type coding) 'raw-text)
1287 default-keyboard-coding-system)))
1288 (read-coding-system
1289 (format "Coding system for keyboard input (default %s): "
1290 default)
1291 default))))
1292 (let ((coding-type (coding-system-type coding-system))
1293 (saved-meta-mode
1294 (terminal-parameter terminal 'keyboard-coding-saved-meta-mode)))
1295 (if (not (eq coding-type 'raw-text))
1296 (let (accept-8-bit)
1297 (if (not (or (coding-system-get coding-system :suitable-for-keyboard)
1298 (coding-system-get coding-system :ascii-compatible-p)))
1299 (error "Unsuitable coding system for keyboard: %s" coding-system))
1300 (cond ((memq coding-type '(charset utf-8 shift-jis big5 ccl))
1301 (setq accept-8-bit t))
1302 ((eq coding-type 'iso-2022)
1303 (let ((flags (coding-system-get coding-system :flags)))
1304 (or (memq '7-bit flags)
1305 (setq accept-8-bit t))))
1307 (error "Unsupported coding system for keyboard: %s"
1308 coding-system)))
1309 (when accept-8-bit
1310 (or saved-meta-mode
1311 (set-terminal-parameter terminal
1312 'keyboard-coding-saved-meta-mode
1313 (cons (nth 2 (current-input-mode))
1314 nil)))
1315 (set-input-meta-mode 8))
1316 ;; Avoid end-of-line conversion.
1317 (setq coding-system
1318 (coding-system-change-eol-conversion coding-system 'unix)))
1320 (when saved-meta-mode
1321 (set-input-meta-mode (car saved-meta-mode))
1322 (set-terminal-parameter terminal
1323 'keyboard-coding-saved-meta-mode
1324 nil))))
1325 (set-keyboard-coding-system-internal coding-system terminal)
1326 (setq keyboard-coding-system coding-system))
1328 (defcustom keyboard-coding-system nil
1329 "Specify coding system for keyboard input.
1330 If you set this on a terminal which can't distinguish Meta keys from
1331 8-bit characters, you will have to use ESC to type Meta characters.
1332 See Info node `Terminal Coding' and Info node `Unibyte Mode'.
1334 On non-windowing terminals, this is set from the locale by default.
1336 Setting this variable directly does not take effect;
1337 use either \\[customize] or \\[set-keyboard-coding-system]."
1338 :type '(coding-system :tag "Coding system")
1339 :link '(info-link "(emacs)Terminal Coding")
1340 :link '(info-link "(emacs)Unibyte Mode")
1341 :set (lambda (symbol value)
1342 ;; Don't load encoded-kb unnecessarily.
1343 (if (or value (boundp 'encoded-kbd-setup-display))
1344 (set-keyboard-coding-system value)
1345 (set-default 'keyboard-coding-system nil))) ; must initialize
1346 :version "22.1"
1347 :group 'keyboard
1348 :group 'mule)
1350 (defun set-buffer-process-coding-system (decoding encoding)
1351 "Set coding systems for the process associated with the current buffer.
1352 DECODING is the coding system to be used to decode input from the process,
1353 ENCODING is the coding system to be used to encode output to the process.
1355 For a list of possible coding systems, use \\[list-coding-systems]."
1356 (interactive
1357 "zCoding-system for output from the process: \nzCoding-system for input to the process: ")
1358 (let ((proc (get-buffer-process (current-buffer))))
1359 (if (null proc)
1360 (error "No process")
1361 (check-coding-system decoding)
1362 (check-coding-system encoding)
1363 (set-process-coding-system proc decoding encoding)))
1364 (force-mode-line-update))
1366 (defalias 'set-clipboard-coding-system 'set-selection-coding-system)
1368 (defun set-selection-coding-system (coding-system)
1369 "Make CODING-SYSTEM used for communicating with other X clients.
1370 When sending or receiving text via cut_buffer, selection, and clipboard,
1371 the text is encoded or decoded by CODING-SYSTEM."
1372 (interactive "zCoding system for X selection: ")
1373 (check-coding-system coding-system)
1374 (setq selection-coding-system coding-system))
1376 ;; Coding system lastly specified by the command
1377 ;; set-next-selection-coding-system.
1378 (defvar last-next-selection-coding-system nil)
1380 (defun set-next-selection-coding-system (coding-system)
1381 "Use CODING-SYSTEM for next communication with other window system clients.
1382 This setting is effective for the next communication only."
1383 (interactive
1384 (list (read-coding-system
1385 (if last-next-selection-coding-system
1386 (format "Coding system for the next selection (default %S): "
1387 last-next-selection-coding-system)
1388 "Coding system for the next selection: ")
1389 last-next-selection-coding-system)))
1390 (if coding-system
1391 (setq last-next-selection-coding-system coding-system)
1392 (setq coding-system last-next-selection-coding-system))
1393 (check-coding-system coding-system)
1395 (setq next-selection-coding-system coding-system))
1397 (defun set-coding-priority (arg)
1398 "Set priority of coding categories according to ARG.
1399 ARG is a list of coding categories ordered by priority.
1401 This function is provided for backward compatibility."
1402 (apply 'set-coding-system-priority
1403 (mapcar #'(lambda (x) (symbol-value x)) arg)))
1404 (make-obsolete 'set-coding-priority 'set-coding-system-priority "23.1")
1406 ;;; X selections
1408 (defvar ctext-non-standard-encodings-alist
1409 (mapcar 'purecopy
1410 '(("big5-0" big5 2 big5)
1411 ("ISO8859-14" iso-8859-14 1 latin-iso8859-14)
1412 ("ISO8859-15" iso-8859-15 1 latin-iso8859-15)
1413 ("gbk-0" gbk 2 chinese-gbk)
1414 ("koi8-r" koi8-r 1 koi8-r)
1415 ("microsoft-cp1251" windows-1251 1 windows-1251)))
1416 "Alist of non-standard encoding names vs the corresponding usages in CTEXT.
1418 It controls how extended segments of a compound text are handled
1419 by the coding system `compound-text-with-extensions'.
1421 Each element has the form (ENCODING-NAME CODING-SYSTEM N-OCTET CHARSET).
1423 ENCODING-NAME is an encoding name of an \"extended segment\".
1425 CODING-SYSTEM is the coding-system to encode (or decode) the
1426 characters into (or from) the extended segment.
1428 N-OCTET is the number of octets (bytes) that encodes a character
1429 in the segment. It can be 0 (meaning the number of octets per
1430 character is variable), 1, 2, 3, or 4.
1432 CHARSET is a character set containing characters that are encoded
1433 in the segment. It can be a list of character sets.
1435 On decoding CTEXT, all encoding names listed here are recognized.
1437 On encoding CTEXT, encoding names in the variable
1438 `ctext-non-standard-encodings' (which see) and in the information
1439 listed for the current language environment under the key
1440 `ctext-non-standard-encodings' are used.")
1442 (defvar ctext-non-standard-encodings nil
1443 "List of non-standard encoding names used in extended segments of CTEXT.
1444 Each element must be one of the names listed in the variable
1445 `ctext-non-standard-encodings-alist' (which see).")
1447 (defvar ctext-non-standard-encodings-regexp
1448 (purecopy
1449 (string-to-multibyte
1450 (concat
1451 ;; For non-standard encodings.
1452 "\\(\e%/[0-4][\200-\377][\200-\377]\\([^\002]+\\)\002\\)"
1453 "\\|"
1454 ;; For UTF-8 encoding.
1455 "\\(\e%G[^\e]*\e%@\\)"))))
1457 ;; Functions to support "Non-Standard Character Set Encodings" defined
1458 ;; by the COMPOUND-TEXT spec. They also support "The UTF-8 encoding"
1459 ;; described in the section 7 of the documentation of COMPOUND-TEXT
1460 ;; distributed with XFree86.
1462 (defun ctext-post-read-conversion (len)
1463 "Decode LEN characters encoded as Compound Text with Extended Segments."
1464 ;; We don't need the following because it is expected that this
1465 ;; function is mainly used for decoding X selection which is not
1466 ;; that big data.
1467 ;;(buffer-disable-undo) ; minimize consing due to insertions and deletions
1468 (save-match-data
1469 (save-restriction
1470 (narrow-to-region (point) (+ (point) len))
1471 (let ((case-fold-search nil)
1472 last-coding-system-used
1473 pos bytes)
1474 (decode-coding-region (point-min) (point-max) 'ctext)
1475 (while (re-search-forward ctext-non-standard-encodings-regexp
1476 nil 'move)
1477 (setq pos (match-beginning 0))
1478 (if (match-beginning 1)
1479 ;; ESC % / [0-4] M L --ENCODING-NAME-- \002 --BYTES--
1480 (let* ((M (multibyte-char-to-unibyte (char-after (+ pos 4))))
1481 (L (multibyte-char-to-unibyte (char-after (+ pos 5))))
1482 (encoding (match-string 2))
1483 (encoding-info (assoc-string
1484 encoding
1485 ctext-non-standard-encodings-alist t))
1486 (coding (if encoding-info
1487 (nth 1 encoding-info)
1488 (setq encoding (intern (downcase encoding)))
1489 (and (coding-system-p encoding)
1490 encoding))))
1491 (setq bytes (- (+ (* (- M 128) 128) (- L 128))
1492 (- (point) (+ pos 6))))
1493 (when coding
1494 (delete-region pos (point))
1495 (forward-char bytes)
1496 (decode-coding-region (- (point) bytes) (point) coding)))
1497 ;; ESC % G --UTF-8-BYTES-- ESC % @
1498 (delete-char -3)
1499 (delete-region pos (+ pos 3))
1500 (decode-coding-region pos (point) 'utf-8))))
1501 (goto-char (point-min))
1502 (- (point-max) (point)))))
1504 (defvar ctext-standard-encodings
1505 '(ascii latin-jisx0201 katakana-jisx0201
1506 latin-iso8859-1 latin-iso8859-2 latin-iso8859-3 latin-iso8859-4
1507 greek-iso8859-7 arabic-iso8859-6 hebrew-iso8859-8 cyrillic-iso8859-5
1508 latin-iso8859-9
1509 chinese-gb2312 japanese-jisx0208 korean-ksc5601)
1510 "List of approved standard encodings (i.e. charsets) of X's Compound Text.
1511 Coding-system `compound-text-with-extensions' encodes a character
1512 belonging to any of those charsets using the normal ISO2022
1513 designation sequence unless the current language environment or
1514 the variable `ctext-non-standard-encodings' decide to use an extended
1515 segment of CTEXT for that character. See also the documentation
1516 of `ctext-non-standard-encodings-alist'.")
1518 ;; Return an alist of CHARSET vs CTEXT-USAGE-INFO generated from
1519 ;; `ctext-non-standard-encodings' and a list specified by the key
1520 ;; `ctext-non-standard-encodings' for the currrent language
1521 ;; environment. CTEXT-USAGE-INFO is one of the element of
1522 ;; `ctext-non-standard-encodings-alist' or nil. In the former case, a
1523 ;; character in CHARSET is encoded using extended segment. In the
1524 ;; latter case, a character in CHARSET is encoded using normal ISO2022
1525 ;; designation sequence. If a character is not in any of CHARSETs, it
1526 ;; is encoded using UTF-8 encoding extention.
1528 (defun ctext-non-standard-encodings-table ()
1529 (let* ((table (append ctext-non-standard-encodings
1530 (copy-sequence
1531 (get-language-info current-language-environment
1532 'ctext-non-standard-encodings))))
1533 (tail table)
1534 elt)
1535 (while tail
1536 (setq elt (car tail))
1537 (let* ((slot (assoc elt ctext-non-standard-encodings-alist))
1538 (charset (nth 3 slot)))
1539 (if (charsetp charset)
1540 (setcar tail
1541 (cons (plist-get (charset-plist charset) :base) slot))
1542 (setcar tail (cons (car charset) slot))
1543 (dolist (cs (cdr charset))
1544 (setcdr tail
1545 (cons (cons (plist-get (charset-plist (car cs)) :base) slot)
1546 (cdr tail)))
1547 (setq tail (cdr tail))))
1548 (setq tail (cdr tail))))
1549 table))
1551 (defun ctext-pre-write-conversion (from to)
1552 "Encode characters between FROM and TO as Compound Text w/Extended Segments.
1554 If FROM is a string, generate a new temp buffer, insert the text,
1555 and convert it in the temporary buffer. Otherwise, convert
1556 in-place."
1557 (save-match-data
1558 ;; Setup a working buffer if necessary.
1559 (when (stringp from)
1560 (set-buffer (generate-new-buffer " *temp"))
1561 (set-buffer-multibyte (multibyte-string-p from))
1562 (insert from)
1563 (setq from 1 to (point-max)))
1564 (save-restriction
1565 (narrow-to-region from to)
1566 (goto-char from)
1567 (let ((encoding-table (ctext-non-standard-encodings-table))
1568 (charset-list (sort-charsets
1569 (copy-sequence ctext-standard-encodings)))
1570 (end-pos (make-marker))
1571 last-coding-system-used
1572 last-pos charset encoding-info)
1573 (dolist (elt encoding-table)
1574 (push (car elt) charset-list))
1575 (setq end-pos (point-marker))
1576 (while (re-search-forward "[^\0-\177]+" nil t)
1577 ;; Found a sequence of non-ASCII characters.
1578 (set-marker end-pos (match-end 0))
1579 (goto-char (match-beginning 0))
1580 (setq last-pos (point)
1581 charset (char-charset (following-char) charset-list))
1582 (forward-char 1)
1583 (while (and (< (point) end-pos)
1584 (eq charset (char-charset (following-char) charset-list)))
1585 (forward-char 1))
1586 (if charset
1587 (if (setq encoding-info (cdr (assq charset encoding-table)))
1588 ;; Encode this range using an extended segment.
1589 (let ((encoding-name (car encoding-info))
1590 (coding-system (nth 1 encoding-info))
1591 (noctets (nth 2 encoding-info))
1592 len)
1593 (encode-coding-region last-pos (point) coding-system)
1594 (setq len (+ (length encoding-name) 1
1595 (- (point) last-pos)))
1596 ;; According to the spec of CTEXT, it is not
1597 ;; necessary to produce this extra designation
1598 ;; sequence, but some buggy application
1599 ;; (e.g. crxvt-gb) requires it.
1600 (insert "\e(B")
1601 (save-excursion
1602 (goto-char last-pos)
1603 (insert (format "\e%%/%d" noctets))
1604 (insert-byte (+ (/ len 128) 128) 1)
1605 (insert-byte (+ (% len 128) 128) 1)
1606 (insert encoding-name)
1607 (insert 2)))
1608 ;; Encode this range as characters in CHARSET.
1609 (put-text-property last-pos (point) 'charset charset))
1610 ;; Encode this range using UTF-8 encoding extention.
1611 (encode-coding-region last-pos (point) 'mule-utf-8)
1612 (save-excursion
1613 (goto-char last-pos)
1614 (insert "\e%G"))
1615 (insert "\e%@")))
1616 (goto-char (point-min)))))
1617 ;; Must return nil, as build_annotations_2 expects that.
1618 nil)
1620 ;;; FILE I/O
1622 (defcustom auto-coding-alist
1623 ;; .exe and .EXE are added to support archive-mode looking at DOS
1624 ;; self-extracting exe archives.
1625 (mapcar (lambda (arg) (cons (purecopy (car arg)) (cdr arg)))
1626 '(("\\.\\(\
1627 arc\\|zip\\|lzh\\|lha\\|zoo\\|[jew]ar\\|xpi\\|rar\\|\
1628 ARC\\|ZIP\\|LZH\\|LHA\\|ZOO\\|[JEW]AR\\|XPI\\|RAR\\)\\'"
1629 . no-conversion-multibyte)
1630 ("\\.\\(exe\\|EXE\\)\\'" . no-conversion)
1631 ("\\.\\(sx[dmicw]\\|odt\\|tar\\|tgz\\)\\'" . no-conversion)
1632 ("\\.\\(gz\\|Z\\|bz\\|bz2\\|gpg\\)\\'" . no-conversion)
1633 ("\\.\\(jpe?g\\|png\\|gif\\|tiff?\\|p[bpgn]m\\)\\'" . no-conversion)
1634 ("\\.pdf\\'" . no-conversion)
1635 ("/#[^/]+#\\'" . emacs-mule)))
1636 "Alist of filename patterns vs corresponding coding systems.
1637 Each element looks like (REGEXP . CODING-SYSTEM).
1638 A file whose name matches REGEXP is decoded by CODING-SYSTEM on reading.
1640 The settings in this alist take priority over `coding:' tags
1641 in the file (see the function `set-auto-coding')
1642 and the contents of `file-coding-system-alist'."
1643 :group 'files
1644 :group 'mule
1645 :type '(repeat (cons (regexp :tag "File name regexp")
1646 (symbol :tag "Coding system"))))
1648 (defcustom auto-coding-regexp-alist
1649 (mapcar (lambda (arg) (cons (purecopy (car arg)) (cdr arg)))
1650 '(("\\`BABYL OPTIONS:[ \t]*-\\*-[ \t]*rmail[ \t]*-\\*-" . no-conversion)
1651 ("\\`\xFE\xFF" . utf-16be-with-signature)
1652 ("\\`\xFF\xFE" . utf-16le-with-signature)
1653 ("\\`\xEF\xBB\xBF" . utf-8-with-signature)
1654 ("\\`;ELC\024\0\0\0" . emacs-mule))) ; Emacs 20-compiled
1655 "Alist of patterns vs corresponding coding systems.
1656 Each element looks like (REGEXP . CODING-SYSTEM).
1657 A file whose first bytes match REGEXP is decoded by CODING-SYSTEM on reading.
1659 The settings in this alist take priority over `coding:' tags
1660 in the file (see the function `set-auto-coding')
1661 and the contents of `file-coding-system-alist'."
1662 :group 'files
1663 :group 'mule
1664 :type '(repeat (cons (regexp :tag "Regexp")
1665 (symbol :tag "Coding system"))))
1667 (defun auto-coding-regexp-alist-lookup (from to)
1668 "Lookup `auto-coding-regexp-alist' for the contents of the current buffer.
1669 The value is a coding system is specified for the region FROM and TO,
1670 or nil."
1671 (save-excursion
1672 (goto-char from)
1673 (let ((alist auto-coding-regexp-alist)
1674 coding-system)
1675 (while (and alist (not coding-system))
1676 (let ((regexp (car (car alist))))
1677 (if enable-multibyte-characters
1678 (setq regexp (string-to-multibyte regexp)))
1679 (if (re-search-forward regexp to t)
1680 (setq coding-system (cdr (car alist)))
1681 (setq alist (cdr alist)))))
1682 coding-system)))
1684 ;; See the bottom of this file for built-in auto coding functions.
1685 (defcustom auto-coding-functions '(sgml-xml-auto-coding-function
1686 sgml-html-meta-auto-coding-function)
1687 "A list of functions which attempt to determine a coding system.
1689 Each function in this list should be written to operate on the
1690 current buffer, but should not modify it in any way. The buffer
1691 will contain undecoded text of parts of the file. Each function
1692 should take one argument, SIZE, which says how many characters
1693 \(starting from point) it should look at.
1695 If one of these functions succeeds in determining a coding
1696 system, it should return that coding system. Otherwise, it
1697 should return nil.
1699 If a file has a `coding:' tag, that takes precedence over these
1700 functions, so they won't be called at all."
1701 :group 'files
1702 :group 'mule
1703 :type '(repeat function))
1705 (defvar set-auto-coding-for-load nil
1706 "Non-nil means look for `load-coding' property instead of `coding'.
1707 This is used for loading and byte-compiling Emacs Lisp files.")
1709 (defun auto-coding-alist-lookup (filename)
1710 "Return the coding system specified by `auto-coding-alist' for FILENAME."
1711 (let ((alist auto-coding-alist)
1712 (case-fold-search (memq system-type '(windows-nt ms-dos cygwin)))
1713 coding-system)
1714 (while (and alist (not coding-system))
1715 (if (string-match (car (car alist)) filename)
1716 (setq coding-system (cdr (car alist)))
1717 (setq alist (cdr alist))))
1718 coding-system))
1720 (put 'enable-character-translation 'permanent-local t)
1721 (put 'enable-character-translation 'safe-local-variable 'booleanp)
1723 (defun find-auto-coding (filename size)
1724 "Find a coding system for a file FILENAME of which SIZE bytes follow point.
1725 These bytes should include at least the first 1k of the file
1726 and the last 3k of the file, but the middle may be omitted.
1728 The function checks FILENAME against the variable `auto-coding-alist'.
1729 If FILENAME doesn't match any entries in the variable, it checks the
1730 contents of the current buffer following point against
1731 `auto-coding-regexp-alist'. If no match is found, it checks for a
1732 `coding:' tag in the first one or two lines following point. If no
1733 `coding:' tag is found, it checks any local variables list in the last
1734 3K bytes out of the SIZE bytes. Finally, if none of these methods
1735 succeed, it checks to see if any function in `auto-coding-functions'
1736 gives a match.
1738 If a coding system is specifed, the return value is a cons
1739 \(CODING . SOURCE), where CODING is the specified coding system and
1740 SOURCE is a symbol `auto-coding-alist', `auto-coding-regexp-alist',
1741 `:coding', or `auto-coding-functions' indicating by what CODING is
1742 specified. Note that the validity of CODING is not checked;
1743 it's the caller's responsibility to check it.
1745 If nothing is specified, the return value is nil."
1746 (or (let ((coding-system (auto-coding-alist-lookup filename)))
1747 (if coding-system
1748 (cons coding-system 'auto-coding-alist)))
1749 ;; Try using `auto-coding-regexp-alist'.
1750 (let ((coding-system (auto-coding-regexp-alist-lookup (point)
1751 (+ (point) size))))
1752 (if coding-system
1753 (cons coding-system 'auto-coding-regexp-alist)))
1754 (let* ((case-fold-search t)
1755 (head-start (point))
1756 (head-end (+ head-start (min size 1024)))
1757 (tail-start (+ head-start (max (- size 3072) 0)))
1758 (tail-end (+ head-start size))
1759 coding-system head-found tail-found pos char-trans)
1760 ;; Try a short cut by searching for the string "coding:"
1761 ;; and for "unibyte:" at the head and tail of SIZE bytes.
1762 (setq head-found (or (search-forward "coding:" head-end t)
1763 (search-forward "unibyte:" head-end t)
1764 (search-forward "enable-character-translation:"
1765 head-end t)))
1766 (if (and head-found (> head-found tail-start))
1767 ;; Head and tail are overlapped.
1768 (setq tail-found head-found)
1769 (goto-char tail-start)
1770 (setq tail-found (or (search-forward "coding:" tail-end t)
1771 (search-forward "unibyte:" tail-end t)
1772 (search-forward "enable-character-translation:"
1773 tail-end t))))
1775 ;; At first check the head.
1776 (when head-found
1777 (goto-char head-start)
1778 (setq head-end (set-auto-mode-1))
1779 (setq head-start (point))
1780 (when (and head-end (< head-found head-end))
1781 (goto-char head-start)
1782 (when (and set-auto-coding-for-load
1783 (re-search-forward
1784 "\\(.*;\\)?[ \t]*unibyte:[ \t]*\\([^ ;]+\\)"
1785 head-end t))
1786 (setq coding-system 'raw-text))
1787 (when (and (not coding-system)
1788 (re-search-forward
1789 "\\(.*;\\)?[ \t]*coding:[ \t]*\\([^ ;]+\\)"
1790 head-end t))
1791 (setq coding-system (intern (match-string 2))))
1792 (when (re-search-forward
1793 "\\(.*;\\)?[ \t]*enable-character-translation:[ \t]*\\([^ ;]+\\)"
1794 head-end t)
1795 (setq char-trans (match-string 2)))))
1797 ;; If no coding: tag in the head, check the tail.
1798 ;; Here we must pay attention to the case that the end-of-line
1799 ;; is just "\r" and we can't use "^" nor "$" in regexp.
1800 (when (and tail-found (or (not coding-system) (not char-trans)))
1801 (goto-char tail-start)
1802 (re-search-forward "[\r\n]\^L" tail-end t)
1803 (if (re-search-forward
1804 "[\r\n]\\([^[\r\n]*\\)[ \t]*Local Variables:[ \t]*\\([^\r\n]*\\)[\r\n]"
1805 tail-end t)
1806 ;; The prefix is what comes before "local variables:" in its
1807 ;; line. The suffix is what comes after "local variables:"
1808 ;; in its line.
1809 (let* ((prefix (regexp-quote (match-string 1)))
1810 (suffix (regexp-quote (match-string 2)))
1811 (re-coding
1812 (concat
1813 "[\r\n]" prefix
1814 ;; N.B. without the \n below, the regexp can
1815 ;; eat newlines.
1816 "[ \t]*coding[ \t]*:[ \t]*\\([^ \t\r\n]+\\)[ \t]*"
1817 suffix "[\r\n]"))
1818 (re-unibyte
1819 (concat
1820 "[\r\n]" prefix
1821 "[ \t]*unibyte[ \t]*:[ \t]*\\([^ \t\r\n]+\\)[ \t]*"
1822 suffix "[\r\n]"))
1823 (re-char-trans
1824 (concat
1825 "[\r\n]" prefix
1826 "[ \t]*enable-character-translation[ \t]*:[ \t]*\\([^ \t\r\n]+\\)[ \t]*"
1827 suffix "[\r\n]"))
1828 (re-end
1829 (concat "[\r\n]" prefix "[ \t]*End *:[ \t]*" suffix
1830 "[\r\n]?"))
1831 (pos (1- (point))))
1832 (forward-char -1) ; skip back \r or \n.
1833 (re-search-forward re-end tail-end 'move)
1834 (setq tail-end (point))
1835 (goto-char pos)
1836 (when (and set-auto-coding-for-load
1837 (re-search-forward re-unibyte tail-end t))
1838 (setq coding-system 'raw-text))
1839 (when (and (not coding-system)
1840 (re-search-forward re-coding tail-end t))
1841 (setq coding-system (intern (match-string 1))))
1842 (when (and (not char-trans)
1843 (re-search-forward re-char-trans tail-end t))
1844 (setq char-trans (match-string 1))))))
1845 (if coding-system
1846 ;; If the coding-system name ends with "!", remove it and
1847 ;; set char-trans to "nil".
1848 (let ((name (symbol-name coding-system)))
1849 (if (= (aref name (1- (length name))) ?!)
1850 (setq coding-system (intern (substring name 0 -1))
1851 char-trans "nil"))))
1852 (when (and char-trans
1853 (not (setq char-trans (intern char-trans))))
1854 (make-local-variable 'enable-character-translation)
1855 (setq enable-character-translation nil))
1856 (if coding-system
1857 (cons coding-system :coding)))
1858 ;; Finally, try all the `auto-coding-functions'.
1859 (let ((funcs auto-coding-functions)
1860 (coding-system nil))
1861 (while (and funcs (not coding-system))
1862 (setq coding-system (condition-case e
1863 (save-excursion
1864 (goto-char (point-min))
1865 (funcall (pop funcs) size))
1866 (error nil))))
1867 (if coding-system
1868 (cons coding-system 'auto-coding-functions)))))
1870 (defun set-auto-coding (filename size)
1871 "Return coding system for a file FILENAME of which SIZE bytes follow point.
1872 See `find-auto-coding' for how the coding system is found.
1873 Return nil if an invalid coding system is found.
1875 The variable `set-auto-coding-function' (which see) is set to this
1876 function by default."
1877 (let ((found (find-auto-coding filename size)))
1878 (if (and found (coding-system-p (car found)))
1879 (car found))))
1881 (setq set-auto-coding-function 'set-auto-coding)
1883 (defun after-insert-file-set-coding (inserted &optional visit)
1884 "Set `buffer-file-coding-system' of current buffer after text is inserted.
1885 INSERTED is the number of characters that were inserted, as figured
1886 in the situation before this function. Return the number of characters
1887 inserted, as figured in the situation after. The two numbers can be
1888 different if the buffer has become unibyte.
1889 The optional second arg VISIT non-nil means that we are visiting a file."
1890 (if (and visit
1891 coding-system-for-read
1892 (not (eq coding-system-for-read 'auto-save-coding)))
1893 (setq buffer-file-coding-system-explicit
1894 (cons coding-system-for-read nil)))
1895 (if last-coding-system-used
1896 (let ((coding-system
1897 (find-new-buffer-file-coding-system last-coding-system-used)))
1898 (if coding-system
1899 (setq buffer-file-coding-system coding-system))))
1900 inserted)
1902 ;; The coding-spec and eol-type of coding-system returned is decided
1903 ;; independently in the following order.
1904 ;; 1. That of buffer-file-coding-system locally bound.
1905 ;; 2. That of CODING.
1907 (defun find-new-buffer-file-coding-system (coding)
1908 "Return a coding system for a buffer when a file of CODING is inserted.
1909 The local variable `buffer-file-coding-system' of the current buffer
1910 is set to the returned value.
1911 Return nil if there's no need to set `buffer-file-coding-system'."
1912 (let (local-coding local-eol
1913 found-coding found-eol
1914 new-coding new-eol)
1915 (if (null coding)
1916 ;; Nothing found about coding.
1919 ;; Get information of `buffer-file-coding-system' in LOCAL-EOL
1920 ;; and LOCAL-CODING.
1921 (setq local-eol (coding-system-eol-type buffer-file-coding-system))
1922 (if (null (numberp local-eol))
1923 ;; But eol-type is not yet set.
1924 (setq local-eol nil))
1925 (if (and buffer-file-coding-system
1926 (not (eq (coding-system-type buffer-file-coding-system)
1927 'undecided)))
1928 (setq local-coding (coding-system-base buffer-file-coding-system)))
1930 (if (and (local-variable-p 'buffer-file-coding-system)
1931 local-eol local-coding)
1932 ;; The current buffer has already set full coding-system, we
1933 ;; had better not change it.
1936 (setq found-eol (coding-system-eol-type coding))
1937 (if (null (numberp found-eol))
1938 ;; But eol-type is not found.
1939 ;; If EOL conversions are inhibited, force unix eol-type.
1940 (setq found-eol (if inhibit-eol-conversion 0)))
1941 (setq found-coding (coding-system-base coding))
1943 (if (and (not found-eol) (eq found-coding 'undecided))
1944 ;; No valid coding information found.
1947 ;; Some coding information (eol or text) found.
1949 ;; The local setting takes precedence over the found one.
1950 (setq new-coding (if (local-variable-p 'buffer-file-coding-system)
1951 (or local-coding found-coding)
1952 (or found-coding local-coding)))
1953 (setq new-eol (if (local-variable-p 'buffer-file-coding-system)
1954 (or local-eol found-eol)
1955 (or found-eol local-eol)))
1957 (let ((eol-type (coding-system-eol-type new-coding)))
1958 (if (and (numberp new-eol) (vectorp eol-type))
1959 (aref eol-type new-eol)
1960 new-coding)))))))
1962 (defun modify-coding-system-alist (target-type regexp coding-system)
1963 "Modify one of look up tables for finding a coding system on I/O operation.
1964 There are three of such tables, `file-coding-system-alist',
1965 `process-coding-system-alist', and `network-coding-system-alist'.
1967 TARGET-TYPE specifies which of them to modify.
1968 If it is `file', it affects `file-coding-system-alist' (which see).
1969 If it is `process', it affects `process-coding-system-alist' (which see).
1970 If it is `network', it affects `network-coding-system-alist' (which see).
1972 REGEXP is a regular expression matching a target of I/O operation.
1973 The target is a file name if TARGET-TYPE is `file', a program name if
1974 TARGET-TYPE is `process', or a network service name or a port number
1975 to connect to if TARGET-TYPE is `network'.
1977 CODING-SYSTEM is a coding system to perform code conversion on the I/O
1978 operation, or a cons cell (DECODING . ENCODING) specifying the coding
1979 systems for decoding and encoding respectively, or a function symbol
1980 which, when called, returns such a cons cell."
1981 (or (memq target-type '(file process network))
1982 (error "Invalid target type: %s" target-type))
1983 (or (stringp regexp)
1984 (and (eq target-type 'network) (integerp regexp))
1985 (error "Invalid regular expression: %s" regexp))
1986 (if (symbolp coding-system)
1987 (if (not (fboundp coding-system))
1988 (progn
1989 (check-coding-system coding-system)
1990 (setq coding-system (cons coding-system coding-system))))
1991 (check-coding-system (car coding-system))
1992 (check-coding-system (cdr coding-system)))
1993 (cond ((eq target-type 'file)
1994 (let ((slot (assoc regexp file-coding-system-alist)))
1995 (if slot
1996 (setcdr slot coding-system)
1997 (setq file-coding-system-alist
1998 (cons (cons regexp coding-system)
1999 file-coding-system-alist)))))
2000 ((eq target-type 'process)
2001 (let ((slot (assoc regexp process-coding-system-alist)))
2002 (if slot
2003 (setcdr slot coding-system)
2004 (setq process-coding-system-alist
2005 (cons (cons regexp coding-system)
2006 process-coding-system-alist)))))
2008 (let ((slot (assoc regexp network-coding-system-alist)))
2009 (if slot
2010 (setcdr slot coding-system)
2011 (setq network-coding-system-alist
2012 (cons (cons regexp coding-system)
2013 network-coding-system-alist)))))))
2015 (defun decode-coding-inserted-region (from to filename
2016 &optional visit beg end replace)
2017 "Decode the region between FROM and TO as if it is read from file FILENAME.
2018 The idea is that the text between FROM and TO was just inserted somehow.
2019 Optional arguments VISIT, BEG, END, and REPLACE are the same as those
2020 of the function `insert-file-contents'.
2021 Part of the job of this function is setting `buffer-undo-list' appropriately."
2022 (save-excursion
2023 (save-restriction
2024 (let ((coding coding-system-for-read)
2025 undo-list-saved)
2026 (if visit
2027 ;; Temporarily turn off undo recording, if we're decoding the
2028 ;; text of a visited file.
2029 (setq buffer-undo-list t)
2030 ;; Otherwise, if we can recognize the undo elt for the insertion,
2031 ;; remove it and get ready to replace it later.
2032 ;; In the mean time, turn off undo recording.
2033 (let ((last (car-safe buffer-undo-list)))
2034 (if (and (consp last) (eql (car last) from) (eql (cdr last) to))
2035 (setq undo-list-saved (cdr buffer-undo-list)
2036 buffer-undo-list t))))
2037 (narrow-to-region from to)
2038 (goto-char (point-min))
2039 (or coding
2040 (setq coding (funcall set-auto-coding-function
2041 filename (- (point-max) (point-min)))))
2042 (or coding
2043 (setq coding (car (find-operation-coding-system
2044 'insert-file-contents
2045 (cons filename (current-buffer))
2046 visit beg end replace))))
2047 (if (coding-system-p coding)
2048 (or enable-multibyte-characters
2049 (setq coding
2050 (coding-system-change-text-conversion coding 'raw-text)))
2051 (setq coding nil))
2052 (if coding
2053 (decode-coding-region (point-min) (point-max) coding)
2054 (setq last-coding-system-used coding))
2055 ;; If we're decoding the text of a visited file,
2056 ;; the undo list should start out empty.
2057 (if visit
2058 (setq buffer-undo-list nil)
2059 ;; If we decided to replace the undo entry for the insertion,
2060 ;; do so now.
2061 (if undo-list-saved
2062 (setq buffer-undo-list
2063 (cons (cons from (point-max)) undo-list-saved))))))))
2065 (defun recode-region (start end new-coding coding)
2066 "Re-decode the region (previously decoded by CODING) by NEW-CODING."
2067 (interactive
2068 (list (region-beginning) (region-end)
2069 (read-coding-system "Text was really in: ")
2070 (let ((coding (or buffer-file-coding-system last-coding-system-used)))
2071 (read-coding-system
2072 (concat "But was interpreted as"
2073 (if coding (format " (default %S): " coding) ": "))
2074 coding))))
2075 (or (and new-coding coding)
2076 (error "Coding system not specified"))
2077 ;; Check it before we encode the region.
2078 (check-coding-system new-coding)
2079 (save-restriction
2080 (narrow-to-region start end)
2081 (encode-coding-region (point-min) (point-max) coding)
2082 (decode-coding-region (point-min) (point-max) new-coding))
2083 (if (region-active-p)
2084 (deactivate-mark)))
2086 (defun make-translation-table (&rest args)
2087 "Make a translation table from arguments.
2088 A translation table is a char table intended for character
2089 translation in CCL programs.
2091 Each argument is a list of elements of the form (FROM . TO), where FROM
2092 is a character to be translated to TO.
2094 The arguments and forms in each argument are processed in the given
2095 order, and if a previous form already translates TO to some other
2096 character, say TO-ALT, FROM is also translated to TO-ALT."
2097 (let ((table (make-char-table 'translation-table))
2098 revlist)
2099 (dolist (elts args)
2100 (dolist (elt elts)
2101 (let ((from (car elt))
2102 (to (cdr elt))
2103 to-alt rev-from rev-to)
2104 ;; If we have already translated TO to TO-ALT, FROM should
2105 ;; also be translated to TO-ALT.
2106 (if (setq to-alt (aref table to))
2107 (setq to to-alt))
2108 (aset table from to)
2109 ;; If we have already translated some chars to FROM, they
2110 ;; should also be translated to TO.
2111 (when (setq rev-from (assq from revlist))
2112 (dolist (elt (cdr rev-from))
2113 (aset table elt to))
2114 (setq revlist (delq rev-from revlist)
2115 rev-from (cdr rev-from)))
2116 ;; Now update REVLIST.
2117 (setq rev-to (assq to revlist))
2118 (if rev-to
2119 (setcdr rev-to (cons from (cdr rev-to)))
2120 (setq rev-to (list to from)
2121 revlist (cons rev-to revlist)))
2122 (if rev-from
2123 (setcdr rev-to (append rev-from (cdr rev-to)))))))
2124 ;; Return TABLE just created.
2125 (set-char-table-extra-slot table 1 1)
2126 table))
2128 (defun make-translation-table-from-vector (vec)
2129 "Make translation table from decoding vector VEC.
2130 VEC is an array of 256 elements to map unibyte codes to multibyte
2131 characters. Elements may be nil for undefined code points.
2132 See also the variable `nonascii-translation-table'."
2133 (let ((table (make-char-table 'translation-table))
2134 (rev-table (make-char-table 'translation-table))
2136 (dotimes (i 256)
2137 (setq ch (aref vec i))
2138 (when ch
2139 (aset table i ch)
2140 (if (>= ch 256)
2141 (aset rev-table ch i))))
2142 (set-char-table-extra-slot table 0 rev-table)
2143 (set-char-table-extra-slot table 1 1)
2144 (set-char-table-extra-slot rev-table 1 1)
2145 table))
2147 (defun make-translation-table-from-alist (alist)
2148 "Make translation table from N<->M mapping in ALIST.
2149 ALIST is an alist, each element has the form (FROM . TO).
2150 FROM and TO are a character or a vector of characters.
2151 If FROM is a character, that character is translated to TO.
2152 If FROM is a vector of characters, that sequence is translated to TO.
2153 The first extra-slot of the value is a translation table for reverse mapping."
2154 (let ((tables (vector (make-char-table 'translation-table)
2155 (make-char-table 'translation-table)))
2156 table max-lookup from to idx val)
2157 (dotimes (i 2)
2158 (setq table (aref tables i))
2159 (setq max-lookup 1)
2160 (dolist (elt alist)
2161 (if (= i 0)
2162 (setq from (car elt) to (cdr elt))
2163 (setq from (cdr elt) to (car elt)))
2164 (if (characterp from)
2165 (setq idx from)
2166 (setq idx (aref from 0)
2167 max-lookup (max max-lookup (length from))))
2168 (setq val (aref table idx))
2169 (if val
2170 (progn
2171 (or (consp val)
2172 (setq val (list (cons (vector idx) val))))
2173 (if (characterp from)
2174 (setq from (vector from)))
2175 (setq val (nconc val (list (cons from to)))))
2176 (if (characterp from)
2177 (setq val to)
2178 (setq val (list (cons from to)))))
2179 (aset table idx val))
2180 (set-char-table-extra-slot table 1 max-lookup))
2181 (set-char-table-extra-slot (aref tables 0) 0 (aref tables 1))
2182 (aref tables 0)))
2184 (defun define-translation-table (symbol &rest args)
2185 "Define SYMBOL as the name of translation table made by ARGS.
2186 This sets up information so that the table can be used for
2187 translations in a CCL program.
2189 If the first element of ARGS is a char-table whose purpose is
2190 `translation-table', just define SYMBOL to name it. (Note that this
2191 function does not bind SYMBOL.)
2193 Any other ARGS should be suitable as arguments of the function
2194 `make-translation-table' (which see).
2196 This function sets properties `translation-table' and
2197 `translation-table-id' of SYMBOL to the created table itself and the
2198 identification number of the table respectively. It also registers
2199 the table in `translation-table-vector'."
2200 (let ((table (if (and (char-table-p (car args))
2201 (eq (char-table-subtype (car args))
2202 'translation-table))
2203 (car args)
2204 (apply 'make-translation-table args)))
2205 (len (length translation-table-vector))
2206 (id 0)
2207 (done nil))
2208 (put symbol 'translation-table table)
2209 (while (not done)
2210 (if (>= id len)
2211 (setq translation-table-vector
2212 (vconcat translation-table-vector (make-vector len nil))))
2213 (let ((slot (aref translation-table-vector id)))
2214 (if (or (not slot)
2215 (eq (car slot) symbol))
2216 (progn
2217 (aset translation-table-vector id (cons symbol table))
2218 (setq done t))
2219 (setq id (1+ id)))))
2220 (put symbol 'translation-table-id id)
2221 id))
2223 (defun translate-region (start end table)
2224 "From START to END, translate characters according to TABLE.
2225 TABLE is a string or a char-table.
2226 If TABLE is a string, the Nth character in it is the mapping
2227 for the character with code N.
2228 If TABLE is a char-table, the element for character N is the mapping
2229 for the character with code N.
2230 It returns the number of characters changed."
2231 (interactive
2232 (list (region-beginning)
2233 (region-end)
2234 (let (table l)
2235 (dotimes (i (length translation-table-vector))
2236 (if (consp (aref translation-table-vector i))
2237 (push (list (symbol-name
2238 (car (aref translation-table-vector i)))) l)))
2239 (if (not l)
2240 (error "No translation table defined"))
2241 (while (not table)
2242 (setq table (completing-read "Translation table: " l nil t)))
2243 (intern table))))
2244 (if (symbolp table)
2245 (let ((val (get table 'translation-table)))
2246 (or (char-table-p val)
2247 (error "Invalid translation table name: %s" table))
2248 (setq table val)))
2249 (translate-region-internal start end table))
2251 (put 'with-category-table 'lisp-indent-function 1)
2253 (defmacro with-category-table (table &rest body)
2254 "Execute BODY like `progn' with TABLE the current category table.
2255 The category table of the current buffer is saved, BODY is evaluated,
2256 then the saved table is restored, even in case of an abnormal exit.
2257 Value is what BODY returns."
2258 (let ((old-table (make-symbol "old-table"))
2259 (old-buffer (make-symbol "old-buffer")))
2260 `(let ((,old-table (category-table))
2261 (,old-buffer (current-buffer)))
2262 (unwind-protect
2263 (progn
2264 (set-category-table ,table)
2265 ,@body)
2266 (with-current-buffer ,old-buffer
2267 (set-category-table ,old-table))))))
2269 (defun define-translation-hash-table (symbol table)
2270 "Define SYMBOL as the name of the hash translation TABLE for use in CCL.
2272 Analogous to `define-translation-table', but updates
2273 `translation-hash-table-vector' and the table is for use in the CCL
2274 `lookup-integer' and `lookup-character' functions."
2275 (unless (and (symbolp symbol)
2276 (hash-table-p table))
2277 (error "Bad args to define-translation-hash-table"))
2278 (let ((len (length translation-hash-table-vector))
2279 (id 0)
2280 done)
2281 (put symbol 'translation-hash-table table)
2282 (while (not done)
2283 (if (>= id len)
2284 (setq translation-hash-table-vector
2285 (vconcat translation-hash-table-vector [nil])))
2286 (let ((slot (aref translation-hash-table-vector id)))
2287 (if (or (not slot)
2288 (eq (car slot) symbol))
2289 (progn
2290 (aset translation-hash-table-vector id (cons symbol table))
2291 (setq done t))
2292 (setq id (1+ id)))))
2293 (put symbol 'translation-hash-table-id id)
2294 id))
2296 ;;; Initialize some variables.
2298 (put 'use-default-ascent 'char-table-extra-slots 0)
2299 (setq use-default-ascent (make-char-table 'use-default-ascent))
2300 (put 'ignore-relative-composition 'char-table-extra-slots 0)
2301 (setq ignore-relative-composition
2302 (make-char-table 'ignore-relative-composition))
2304 (make-obsolete 'set-char-table-default
2305 "generic characters no longer exist." "23.1")
2307 ;;; Built-in auto-coding-functions:
2309 (defun sgml-xml-auto-coding-function (size)
2310 "Determine whether the buffer is XML, and if so, its encoding.
2311 This function is intended to be added to `auto-coding-functions'."
2312 (setq size (+ (point) size))
2313 (when (re-search-forward "\\`[[:space:]\n]*<\\?xml" size t)
2314 (let ((end (save-excursion
2315 ;; This is a hack.
2316 (re-search-forward "[\"']\\s-*\\?>" size t))))
2317 (when end
2318 (if (re-search-forward "encoding=[\"']\\(.+?\\)[\"']" end t)
2319 (let* ((match (match-string 1))
2320 (sym (intern (downcase match))))
2321 (if (coding-system-p sym)
2323 (message "Warning: unknown coding system \"%s\"" match)
2324 nil))
2325 ;; Files without an encoding tag should be UTF-8. But users
2326 ;; may be naive about encodings, and have saved the file from
2327 ;; another editor that does not help them get the encoding right.
2328 ;; Detect the encoding and warn the user if it is detected as
2329 ;; something other than UTF-8.
2330 (let ((detected
2331 (with-coding-priority '(utf-8)
2332 (coding-system-base
2333 (detect-coding-region (point-min) size t)))))
2334 ;; Pure ASCII always comes back as undecided.
2335 (if (memq detected '(utf-8 undecided))
2336 'utf-8
2337 (warn "File contents detected as %s.
2338 Consider adding an encoding attribute to the xml declaration,
2339 or saving as utf-8, as mandated by the xml specification." detected)
2340 detected)))))))
2342 (defun sgml-html-meta-auto-coding-function (size)
2343 "If the buffer has an HTML meta tag, use it to determine encoding.
2344 This function is intended to be added to `auto-coding-functions'."
2345 (let ((case-fold-search t))
2346 (setq size (min (+ (point) size)
2347 (save-excursion
2348 ;; Limit the search by the end of the HTML header.
2349 (or (search-forward "</head>" (+ (point) size) t)
2350 ;; In case of no header, search only 10 lines.
2351 (forward-line 10))
2352 (point))))
2353 ;; Make sure that the buffer really contains an HTML document, by
2354 ;; checking that it starts with a doctype or a <HTML> start tag
2355 ;; (allowing for whitespace at bob). Note: 'DOCTYPE NETSCAPE' is
2356 ;; useful for Mozilla bookmark files.
2357 (when (and (re-search-forward "\\`[[:space:]\n]*\\(<!doctype[[:space:]\n]+\\(html\\|netscape\\)\\|<html\\)" size t)
2358 (re-search-forward "<meta\\s-+http-equiv=[\"']?content-type[\"']?\\s-+content=[\"']text/\\sw+;\\s-*charset=\\(.+?\\)[\"']" size t))
2359 (let* ((match (match-string 1))
2360 (sym (intern (downcase match))))
2361 (if (coding-system-p sym)
2363 (message "Warning: unknown coding system \"%s\"" match)
2364 nil)))))
2366 (defun xml-find-file-coding-system (args)
2367 "Determine the coding system of an XML file without a declaration.
2368 Strictly speaking, the file should be utf-8, but mistakes are
2369 made, and there are genuine cases where XML fragments are saved,
2370 with the encoding properly specified in a master document, or
2371 added by processing software."
2372 (if (eq (car args) 'insert-file-contents)
2373 (let ((detected
2374 (with-coding-priority '(utf-8)
2375 (coding-system-base
2376 (detect-coding-region (point-min) (point-max) t)))))
2377 ;; Pure ASCII always comes back as undecided.
2378 (cond
2379 ((memq detected '(utf-8 undecided))
2380 'utf-8)
2381 ((eq detected 'utf-16le-with-signature) 'utf-16le-with-signature)
2382 ((eq detected 'utf-16be-with-signature) 'utf-16be-with-signature)
2384 (warn "File contents detected as %s.
2385 Consider adding an xml declaration with the encoding specified,
2386 or saving as utf-8, as mandated by the xml specification." detected)
2387 detected)))
2388 ;; Don't interfere with the user's wishes for saving the buffer.
2389 ;; We did what we could when the buffer was created to ensure the
2390 ;; correct encoding was used, or the user was warned, so any
2391 ;; non-conformity here is deliberate on the part of the user.
2392 'undecided))
2395 (provide 'mule)
2397 ;; arch-tag: 9aebaa6e-0e8a-40a9-b857-cb5d04a39e7c
2398 ;;; mule.el ends here