code.delx.au - gnu-emacs/blob - lisp/international/iso-acc.el

   1 ;;; iso-acc.el --- minor mode providing electric accent keys
   2
   3 ;; Copyright (C) 1993, 1994, 1996 Free Software Foundation, Inc.
   4
   5 ;; Author: Johan Vromans
   6 ;; Maintainer: FSF
   7 ;; Keywords: i18n
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 2, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  24 ;; Boston, MA 02111-1307, USA.
  25
  26 ;;; Commentary:
  27
  28 ;; Function `iso-accents-mode' activates a minor mode in which
  29 ;; typewriter "dead keys" are emulated.  The purpose of this emulation
  30 ;; is to provide a simple means for inserting accented characters
  31 ;; according to the ISO-8859-1...3 character sets.
  32 ;;
  33 ;; In `iso-accents-mode', pseudo accent characters are used to
  34 ;; introduce accented keys.  The pseudo-accent characters are:
  35 ;;
  36 ;;   '  (minute)    -> grave accent
  37 ;;   `  (backtick)  -> acute accent
  38 ;;   "  (second)    -> diaeresis
  39 ;;   ^  (caret)     -> circumflex
  40 ;;   ~  (tilde)     -> tilde over the character
  41 ;;   /  (slash)     -> slash through the character.
  42 ;;                     Also:  /A is A-with-ring and /E is AE ligature.
  43 ;; These two are enabled only if you set iso-accents-enable
  44 ;; to include them:
  45 ;;   .  (period)    -> dot over the character (some languages only)
  46 ;;   ,  (cedilla)   -> cedilla under the character (some languages only)
  47 ;;
  48 ;; The action taken depends on the key that follows the pseudo accent.
  49 ;; In general:
  50 ;;
  51 ;;   pseudo-accent + appropriate letter -> accented letter
  52 ;;   pseudo-accent + space -> pseudo-accent (except comma and period)
  53 ;;   pseudo-accent + pseudo-accent -> accent (if available)
  54 ;;   pseudo-accent + other -> pseudo-accent + other
  55 ;;
  56 ;; If the pseudo-accent is followed by anything else than a
  57 ;; self-insert-command, the dead-key code is terminated, the
  58 ;; pseudo-accent inserted 'as is' and the bell is rung to signal this.
  59 ;;
  60 ;; Function `iso-accents-mode' can be used to enable the iso accents
  61 ;; minor mode, or disable it.
  62
  63 ;; If you want only some of these characters to serve as accents,
  64 ;; add a language to `iso-languages' which specifies the accent characters
  65 ;; that you want, then select the language with `iso-accents-customize'.
  66 \f
  67 ;;; Code:
  68
  69 (provide 'iso-acc)
  70
  71 (defvar iso-accents-insert-offset nonascii-insert-offset
  72   "*Offset added by ISO Accents mode to character codes 0200 and above.")
  73
  74 (defvar iso-languages
  75   '(("catalan"
  76      ;; Note this includes some extra characters used in Spanish,
  77      ;; on the idea that someone who uses Catalan is likely to use Spanish
  78      ;; as well.
  79      (?' (?A . ?\301) (?E . ?\311) (?I . ?\315) (?O . ?\323) (?U . ?\332)
  80          (?a . ?\341) (?e . ?\351) (?i . ?\355) (?o . ?\363) (?u . ?\372)
  81          (?\  . ?'))
  82      (?` (?A . ?\300) (?E . ?\310) (?O . ?\322)
  83          (?a . ?\340) (?e . ?\350) (?o . ?\362)
  84          (?\  . ?`))
  85      (?\" (?I . ?\317) (?U . ?\334) (?i . ?\357) (?u . ?\374)
  86           (?\  . ?\"))
  87      (?~ (?C . ?\307) (?N . ?\321) (?c . ?\347) (?n . ?\361)
  88          (?> . ?\273) (?< . ?\253) (?! . ?\241) (?? . ?\277)
  89          (?\  . ?\~)))
  90
  91     ("esperanto"
  92      (?^ (?H . ?\246) (?J . ?\254) (?h . ?\266) (?j . ?\274) (?C . ?\306)
  93          (?G . ?\330) (?S . ?\336) (?c . ?\346) (?g . ?\370) (?s . ?\376)
  94          (?^ . ?^) (?\  . ?^))
  95      (?~ (?U . ?\335) (?u . ?\375) (?\  . ?~)))
  96
  97     ("french"
  98      (?' (?E . ?\311) (?C . ?\307) (?e . ?\351) (?c . ?\347)
  99          (?\  . ?'))
 100      (?` (?A . ?\300) (?E . ?\310) (?U . ?\331)
 101          (?a . ?\340) (?e . ?\350) (?u . ?\371)
 102          (?\  . ?`))
 103      (?^ (?A . ?\302) (?E . ?\312) (?I . ?\316) (?O . ?\324) (?U . ?\333)
 104          (?a . ?\342) (?e . ?\352) (?i . ?\356) (?o . ?\364) (?u . ?\373)
 105          (?\  . ?^))
 106      (?\" (?E . ?\313) (?I . ?\317)
 107           (?e . ?\353) (?i . ?\357)
 108           (?\  . ?\"))
 109      (?~ (?< . ?\253) (?> . ?\273) (?C . ?\307) (?c . ?\347)
 110          (?,  . ?,))
 111      (?, (?C . ?\307) (?c . ?\347) (?\  . ?\~)))
 112
 113     ("german"
 114      (?\" (?A . ?\304) (?O . ?\326) (?U . ?\334)
 115           (?a . ?\344) (?o . ?\366) (?u . ?\374) (?s . ?\337) (?\  . ?\")))
 116
 117     ("irish"
 118      (?' (?A . ?\301) (?E . ?\311) (?I . ?\315) (?O . ?\323) (?U . ?\332)
 119          (?a . ?\341) (?e . ?\351) (?i . ?\355) (?o . ?\363) (?u . ?\372)
 120          (?\  . ?')))
 121
 122     ("portuguese"
 123      (?' (?A . ?\301) (?E . ?\311) (?I . ?\315) (?O . ?\323) (?U . ?\332)
 124          (?C . ?\307) (?a . ?\341) (?e . ?\351) (?i . ?\355) (?o . ?\363)
 125          (?u . ?\372) (?c . ?\347)
 126          (?\  . ?'))
 127      (?` (?A . ?\300) (?a . ?\340)
 128          (?\  . ?`))
 129      (?^ (?A . ?\302) (?E . ?\312) (?O . ?\324)
 130          (?a . ?\342) (?e . ?\352) (?o . ?\364)
 131          (?\  . ?^))
 132      (?\" (?U . ?\334) (?u . ?\374)
 133           (?\  . ?\"))
 134      (?~ (?A . ?\303) (?O . ?\325) (?a . ?\343) (?o . ?\365)
 135          (?\  . ?~))
 136      (?, (?c . ?\347) (?C . ?\307) (?, . ?,)))
 137
 138     ("spanish"
 139      (?' (?A . ?\301) (?E . ?\311) (?I . ?\315) (?O . ?\323) (?U . ?\332)
 140          (?a . ?\341) (?e . ?\351) (?i . ?\355) (?o . ?\363) (?u . ?\372)
 141          (?\  . ?'))
 142      (?\" (?U . ?\334) (?u . ?\374) (?\  . ?\"))
 143      (?\~ (?N . ?\321) (?n . ?\361) (?> . ?\273) (?< . ?\253) (?! . ?\241)
 144           (?? . ?\277) (?\  . ?\~)))
 145
 146     ("latin-1"
 147      (?' (?A . ?\301) (?E . ?\311) (?I . ?\315) (?O . ?\323) (?U . ?\332)
 148          (?Y . ?\335) (?a . ?\341) (?e . ?\351) (?i . ?\355) (?o . ?\363)
 149          (?u . ?\372) (?y . ?\375) (?' . ?\264)
 150          (?\  . ?'))
 151      (?` (?A . ?\300) (?E . ?\310) (?I . ?\314) (?O . ?\322) (?U . ?\331)
 152          (?a . ?\340) (?e . ?\350) (?i . ?\354) (?o . ?\362) (?u . ?\371)
 153          (?` . ?`) (?\  . ?`))
 154      (?^ (?A . ?\302) (?E . ?\312) (?I . ?\316) (?O . ?\324) (?U . ?\333)
 155          (?a . ?\342) (?e . ?\352) (?i . ?\356) (?o . ?\364) (?u . ?\373)
 156          (?^ . ?^) (?\  . ?^))
 157      (?\" (?A . ?\304) (?E . ?\313) (?I . ?\317) (?O . ?\326) (?U . ?\334)
 158           (?a . ?\344) (?e . ?\353) (?i . ?\357) (?o . ?\366) (?s . ?\337)
 159           (?u . ?\374) (?y . ?\377)
 160           (?\" . ?\250) (?\  . ?\"))
 161      (?~ (?A . ?\303) (?C . ?\307) (?D . ?\320) (?N . ?\321) (?O . ?\325)
 162          (?T . ?\336) (?a . ?\343) (?c . ?\347) (?d . ?\360) (?n . ?\361)
 163          (?o . ?\365) (?t . ?\376)
 164          (?> . ?\273) (?< . ?\253) (?! . ?\241) (?? . ?\277)
 165          (?\~ . ?\270) (?\  . ?~))
 166      (?/ (?A . ?\305) (?E . ?\306) (?O . ?\330) (?a . ?\345) (?e . ?\346)
 167          (?o . ?\370)
 168          (?/ . ?\260) (?\  . ?/)))
 169
 170     ("latin-2" latin-iso8859-2
 171      (?' (?A . ?\301) (?C . ?\306) (?D . ?\320) (?E . ?\311) (?I . ?\315)
 172          (?L . ?\305) (?N . ?\321) (?O . ?\323) (?R . ?\300) (?S . ?\246)
 173          (?U . ?\332) (?Y . ?\335) (?Z . ?\254)
 174          (?a . ?\341) (?c . ?\346) (?d . ?\360) (?e . ?\351) (?i . ?\355)
 175          (?l . ?\345) (?n . ?\361) (?o . ?\363) (?r . ?\340) (?s . ?\266)
 176          (?u . ?\372) (?y . ?\375) (?z . ?\274)
 177          (?' . ?\264) (?\  . ?'))
 178      (?` (?A . ?\241) (?C . ?\307) (?E . ?\312) (?L . ?\243) (?S . ?\252)
 179          (?T . ?\336) (?Z . ?\257)
 180          (?a . ?\261) (?l . ?\263) (?c . ?\347) (?e . ?\352) (?s . ?\272)
 181          (?t . ?\376) (?z . ?\277)
 182          (?` . ?\252)
 183          (?. . ?\377) (?\  . ?`))
 184      (?^ (?A . ?\302) (?I . ?\316) (?O . ?\324)
 185          (?a . ?\342) (?i . ?\356) (?o . ?\364)
 186          (?^ . ?^)                      ; no special code?
 187          (?\  . ?^))
 188      (?\" (?A . ?\304) (?E . ?\313) (?O . ?\326) (?U . ?\334)
 189           (?a . ?\344) (?e . ?\353) (?o . ?\366) (?s . ?\337) (?u . ?\374)
 190           (?\" . ?\250)
 191           (?\  . ?\"))
 192      (?~ (?A . ?\303) (?C . ?\310) (?D . ?\317) (?L . ?\245) (?N . ?\322)
 193          (?O . ?\325) (?R . ?\330) (?S . ?\251) (?T . ?\253) (?U . ?\333)
 194          (?Z . ?\256)
 195          (?a . ?\343) (?c . ?\350) (?d . ?\357) (?l . ?\265) (?n . ?\362)
 196          (?o . ?\365) (?r . ?\370) (?s . ?\271) (?t . ?\273) (?u . ?\373)
 197          (?z . ?\276)
 198          (?v . ?\242)                   ; v accent
 199          (?\~ . ?\242)                  ; v accent
 200          (?\. . ?\270)                  ; cedilla accent
 201          (?\  . ?~)))
 202
 203     ("latin-3" latin-iso8859-3
 204      (?' (?A . ?\301) (?E . ?\311) (?I . ?\315) (?O . ?\323) (?U . ?\332)
 205          (?a . ?\341) (?e . ?\351) (?i . ?\355) (?o . ?\363) (?u . ?\372)
 206          (?' . ?\264) (?\  . ?'))
 207      (?` (?A . ?\300) (?E . ?\310) (?I . ?\314) (?O . ?\322) (?U . ?\331)
 208          (?a . ?\340) (?e . ?\350) (?i . ?\354) (?o . ?\362) (?u . ?\371)
 209          (?` . ?`) (?\  . ?`))
 210      (?^ (?A . ?\302) (?C . ?\306) (?E . ?\312) (?G . ?\330) (?H . ?\246)
 211          (?I . ?\316) (?J . ?\254) (?O . ?\324) (?S . ?\336) (?U . ?\333)
 212          (?a . ?\342) (?c . ?\346) (?e . ?\352) (?g . ?\370) (?h . ?\266)
 213          (?i . ?\356) (?j . ?\274) (?o . ?\364) (?s . ?\376) (?u . ?\373)
 214          (?^ . ?^) (?\  . ?^))
 215      (?\" (?A . ?\304) (?E . ?\313) (?I . ?\317) (?O . ?\326) (?U . ?\334)
 216           (?a . ?\344) (?e . ?\353) (?i . ?\357) (?o . ?\366) (?u . ?\374)
 217           (?s . ?\337)
 218           (?\" . ?\250) (?\  . ?\"))
 219      (?~ (?A . ?\303) (?C . ?\307) (?D . ?\320) (?N . ?\321) (?O . ?\325)
 220          (?a . ?\343) (?c . ?\347) (?d . ?\360) (?n . ?\361) (?o . ?\365)
 221          (?$ . ?\245) (?S . ?\252) (?s . ?\272) (?G . ?\253) (?g . ?\273)
 222          (?U . ?\335) (?u . ?\375) (?` . ?\242)
 223          (?~ . ?\270) (?\  . ?~))
 224      (?/ (?C . ?\305) (?G . ?\325) (?H . ?\241) (?I . ?\251) (?Z . ?\257)
 225          (?c . ?\345) (?g . ?\365) (?h . ?\261) (?i . ?\271) (?z . ?\277)
 226          (?r . ?\256)
 227          (?. . ?\377) (?# . ?\243) (?$ . ?\244)
 228          (?/ . ?\260) (?\  . ?/))
 229      (?. (?C . ?\305) (?G . ?\325) (?I . ?\251) (?Z . ?\257)
 230          (?c . ?\345) (?g . ?\365) (?z . ?\277))))
 231   "List of language-specific customizations for the ISO Accents mode.
 232
 233 Each element of the list is of the form
 234
 235     (LANGUAGE [CHARSET]
 236      (PSEUDO-ACCENT MAPPINGS)
 237      (PSEUDO-ACCENT MAPPINGS)
 238      ...)
 239
 240 LANGUAGE is a string naming the language.
 241 CHARSET (which may be omitted) is the symbol name
 242  of the character set used in this language.
 243  If CHARSET is omitted, latin-iso8859-1 is the default.
 244 PSEUDO-ACCENT is a char specifying an accent key.
 245 MAPPINGS are cons cells of the form (CHAR . ISO-CHAR).
 246
 247 The net effect is that the key sequence PSEUDO-ACCENT CHAR is mapped
 248 to ISO-CHAR on input.")
 249
 250 (defvar iso-language nil
 251   "Language for which ISO Accents mode is currently customized.
 252 Change it with the `iso-accents-customize' function.")
 253
 254 (defvar iso-accents-list nil
 255   "Association list for ISO accent combinations, for the chosen language.")
 256
 257 (defvar iso-accents-mode nil
 258   "*Non-nil enables ISO Accents mode.
 259 Setting this variable makes it local to the current buffer.
 260 See the function `iso-accents-mode'.")
 261 (make-variable-buffer-local 'iso-accents-mode)
 262
 263 (defvar iso-accents-enable '(?' ?` ?^ ?\" ?~ ?/)
 264   "*List of accent keys that become prefixes in ISO Accents mode.
 265 The default is (?' ?` ?^ ?\" ?~ ?/), which contains all the supported
 266 accent keys.  If you set this variable to a list in which some of those
 267 characters are missing, the missing ones do not act as accents.
 268
 269 Note that if you specify a language with `iso-accents-customize',
 270 that can also turn off certain prefixes (whichever ones are not needed in
 271 the language you choose).")
 272
 273 (defun iso-accents-accent-key (prompt)
 274   "Modify the following character by adding an accent to it."
 275   ;; Pick up the accent character.
 276   (if (and iso-accents-mode
 277            (memq last-input-char iso-accents-enable))
 278       (iso-accents-compose prompt)
 279     (char-to-string last-input-char)))
 280
 281 (defun iso-accents-compose (prompt)
 282   (let* ((first-char last-input-char)
 283          (list (assq first-char iso-accents-list))
 284          ;; Wait for the second key and look up the combination.
 285          (second-char (if (or prompt
 286                               (not (eq (key-binding "a")
 287                                        'self-insert-command))
 288                               ;; Not at start of a key sequence.
 289                               (> (length (this-single-command-keys)) 1)
 290                               ;; Called from anything but the command loop.
 291                               this-command)
 292                           (progn
 293                             (message "%s%c"
 294                                      (or prompt "Compose with ")
 295                                      first-char)
 296                             (read-event))
 297                         (insert first-char)
 298                         (prog1 (read-event)
 299                           (delete-region (1- (point)) (point)))))
 300          (entry (cdr (assq second-char list))))
 301     (if entry
 302         ;; Found it: return the mapped char
 303         (vector
 304          (if (and enable-multibyte-characters
 305                   (>= entry ?\200))
 306              (+ iso-accents-insert-offset entry)
 307            entry))
 308       ;; Otherwise, advance and schedule the second key for execution.
 309       (setq unread-command-events
 310             (cons (list second-char) unread-command-events))
 311       (vector first-char))))
 312
 313 ;; It is a matter of taste if you want the minor mode indicated
 314 ;; in the mode line...
 315 ;; If so, uncomment the next four lines.
 316 ;; (or (assq 'iso-accents-mode minor-mode-alist)
 317 ;;     (setq minor-mode-alist
 318 ;;        (append minor-mode-alist
 319 ;;                '((iso-accents-mode " ISO-Acc")))))
 320
 321 ;;;###autoload
 322 (defun iso-accents-mode (&optional arg)
 323   "Toggle ISO Accents mode, in which accents modify the following letter.
 324 This permits easy insertion of accented characters according to ISO-8859-1.
 325 When Iso-accents mode is enabled, accent character keys
 326 \(`, ', \", ^, / and ~) do not self-insert; instead, they modify the following
 327 letter key so that it inserts an ISO accented letter.
 328
 329 You can customize ISO Accents mode to a particular language
 330 with the command `iso-accents-customize'.
 331
 332 Special combinations: ~c gives a c with cedilla,
 333 ~d gives an Icelandic eth (d with dash).
 334 ~t gives an Icelandic thorn.
 335 \"s gives German sharp s.
 336 /a gives a with ring.
 337 /e gives an a-e ligature.
 338 ~< and ~> give guillemots.
 339 ~! gives an inverted exclamation mark.
 340 ~? gives an inverted question mark.
 341
 342 With an argument, a positive argument enables ISO Accents mode,
 343 and a negative argument disables it."
 344
 345   (interactive "P")
 346
 347   (if (if arg
 348           ;; Negative arg means switch it off.
 349           (<= (prefix-numeric-value arg) 0)
 350         ;; No arg means toggle.
 351         iso-accents-mode)
 352       (setq iso-accents-mode nil)
 353
 354     ;; Enable electric accents.
 355     (setq iso-accents-mode t)))
 356
 357 (defun iso-accents-customize (language)
 358   "Customize the ISO accents machinery for a particular language.
 359 It selects the customization based on the specifications in the
 360 `iso-languages' variable."
 361   (interactive (list (completing-read "Language: " iso-languages nil t)))
 362   (let ((table (cdr (assoc language iso-languages)))
 363         all-accents tail)
 364     (if (not table)
 365         (error "Unknown language `%s'" language)
 366       (setq iso-accents-insert-offset (- (make-char (if (symbolp (car table))
 367                                                         (car table)
 368                                                       'latin-iso8859-1))
 369                                          128))
 370       (if (symbolp (car table))
 371           (setq table (cdr table)))
 372       (setq iso-language language
 373             iso-accents-list table)
 374       (if key-translation-map
 375           (substitute-key-definition
 376            'iso-accents-accent-key nil key-translation-map)
 377         (setq key-translation-map (make-sparse-keymap)))
 378       ;; Set up translations for all the characters that are used as
 379       ;; accent prefixes in this language.
 380       (setq tail iso-accents-list)
 381       (while tail
 382         (define-key key-translation-map (vector (car (car tail)))
 383           'iso-accents-accent-key)
 384         (setq tail (cdr tail))))))
 385
 386 (defun iso-accentuate (start end)
 387   "Convert two-character sequences in region into accented characters.
 388 Noninteractively, this operates on text from START to END.
 389 This uses the same conversion that ISO Accents mode uses for type-in."
 390   (interactive "r")
 391   (save-excursion
 392     (save-restriction
 393       (narrow-to-region start end)
 394       (goto-char start)
 395       (forward-char 1)
 396       (let (entry)
 397         (while (< (point) end)
 398           (if (and (memq (preceding-char) iso-accents-enable)
 399                    (setq entry (cdr (assq (following-char) (assq (preceding-char) iso-accents-list)))))
 400               (progn
 401                 (forward-char -1)
 402                 (delete-char 2)
 403                 (insert entry)
 404                 (setq end (1- end)))
 405             (forward-char 1)))))))
 406
 407 (defun iso-accent-rassoc-unit (value alist)
 408   (let (elt acc)
 409     (while (and alist (not elt))
 410       (setq acc (car (car alist))
 411             elt (car (rassq value (cdr (car alist))))
 412             alist (cdr alist)))
 413     (if elt
 414         (cons acc elt))))
 415
 416 (defun iso-unaccentuate (start end)
 417   "Convert accented characters in the region into two-character sequences.
 418 Noninteractively, this operates on text from START to END.
 419 This uses the opposite of the conversion done by ISO Accents mode for type-in."
 420   (interactive "r")
 421   (save-excursion
 422     (save-restriction
 423       (narrow-to-region start end)
 424       (goto-char start)
 425       (let (entry)
 426         (while (< (point) end)
 427           (if (and (> (following-char) 127)
 428                    (setq entry (iso-accent-rassoc-unit (following-char)
 429                                                        iso-accents-list)))
 430               (progn
 431                 (delete-char 1)
 432                 (insert (car entry) (cdr entry))
 433                 (setq end (1+ end)))
 434             (forward-char 1)))))))
 435
 436 (defun iso-deaccentuate (start end)
 437   "Convert accented characters in the region into unaccented characters.
 438 Noninteractively, this operates on text from START to END."
 439   (interactive "r")
 440   (save-excursion
 441     (save-restriction
 442       (narrow-to-region start end)
 443       (goto-char start)
 444       (let (entry)
 445         (while (< (point) end)
 446           (if (and (> (following-char) 127)
 447                    (setq entry (iso-accent-rassoc-unit (following-char)
 448                                                        iso-accents-list)))
 449               (progn
 450                 (delete-char 1)
 451                 (insert (cdr entry)))
 452             (forward-char 1)))))))
 453
 454 ;; Set up the default settings.
 455 (iso-accents-customize "latin-1")
 456
 457 ;; Use Iso-Accents mode in the minibuffer
 458 ;; if it was in use in the previous buffer.
 459 (defun iso-acc-minibuf-setup ()
 460   (setq iso-accents-mode
 461         (save-excursion
 462           (set-buffer (window-buffer minibuffer-scroll-window))
 463           iso-accents-mode)))
 464
 465 (add-hook 'minibuffer-setup-hook 'iso-acc-minibuf-setup)
 466
 467 ;;; iso-acc.el ends here