1 ;;; iso-acc.el --- minor mode providing electric accent keys
3 ;; Copyright (C) 1993, 1994, 1996 Free Software Foundation, Inc.
5 ;; Author: Johan Vromans
9 ;; This file is part of GNU Emacs.
11 ;; GNU Emacs is free software; you can redistribute it and/or modify
12 ;; it under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation; either version 2, or (at your option)
16 ;; GNU Emacs is distributed in the hope that it will be useful,
17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 ;; GNU General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs; see the file COPYING. If not, write to the
23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 ;; Boston, MA 02111-1307, USA.
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 character set.
33 ;; In `iso-accents-mode', pseudo accent characters are used to
34 ;; introduce accented keys. The pseudo-accent characters are:
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.
44 ;; The action taken depends on the key that follows the pseudo accent.
47 ;; pseudo-accent + appropriate letter -> accented letter
48 ;; pseudo-accent + space -> pseudo-accent
49 ;; pseudo-accent + pseudo-accent -> accent (if available)
50 ;; pseudo-accent + other -> pseudo-accent + other
52 ;; If the pseudo-accent is followed by anything else than a
53 ;; self-insert-command, the dead-key code is terminated, the
54 ;; pseudo-accent inserted 'as is' and the bell is rung to signal this.
56 ;; Function `iso-accents-mode' can be used to enable the iso accents
57 ;; minor mode, or disable it.
59 ;; If you want only some of these characters to serve as accents,
60 ;; add a language to `iso-languages' which specifies the accent characters
61 ;; that you want, then select the language with `iso-accents-customize'.
69 (?' (?A . ?\301) (?E . ?\311) (?I . ?\315) (?O . ?\323) (?U . ?\332)
70 (?C . ?\307) (?a . ?\341) (?e . ?\351) (?i . ?\355) (?o . ?\363)
71 (?u . ?\372) (?c . ?\347) (?\ . ?'))
72 (?` (?A . ?\300) (?a . ?\340) (?\ . ?`))
73 (?^ (?A . ?\302) (?E . ?\312) (?O . ?\324) (?a . ?\342) (?e . ?\352)
74 (?o . ?\364) (?\ . ?^))
75 (?\" (?U . ?\334) (?u . ?\374) (?\ . ?\"))
76 (?\~ (?A . ?\303) (?O . ?\325) (?a . ?\343) (?o . ?\365) (?\ . ?\~)))
79 (?' (?A . ?\301) (?E . ?\311) (?I . ?\315) (?O . ?\323) (?U . ?\332)
80 (?a . ?\341) (?e . ?\351) (?i . ?\355) (?o . ?\363) (?u . ?\372)
84 (?' (?E . ?\311) (?C . ?\307) (?e . ?\351) (?c . ?\347) (?\ . ?'))
85 (?` (?A . ?\300) (?E . ?\310) (?U . ?\331)
86 (?a . ?\340) (?e . ?\350) (?u . ?\371) (?\ . ?`))
87 (?^ (?A . ?\302) (?E . ?\312) (?I . ?\316) (?O . ?\324) (?U . ?\333)
88 (?a . ?\342) (?e . ?\352) (?i . ?\356) (?o . ?\364) (?u . ?\373)
90 (?\" (?E . ?\313) (?I . ?\317)
91 (?e . ?\353) (?i . ?\357) (?\ . ?\"))
92 (?\~ (?< . ?\253) (?> . ?\273) (?C . ?\307) (?c . ?\347) (?\ . ?\~)))
95 (?' (?A . ?\301) (?C . ?\306) (?D . ?\320) (?E . ?\311) (?I . ?\315)
96 (?L . ?\305) (?N . ?\321) (?O . ?\323) (?R . ?\300) (?S . ?\246)
97 (?U . ?\332) (?Y . ?\335) (?Z . ?\254) (?a . ?\341) (?c . ?\346)
98 (?d . ?\360) (?e . ?\351) (?i . ?\355) (?l . ?\345) (?n . ?\361)
99 (?o . ?\363) (?r . ?\340) (?s . ?\266) (?u . ?\372) (?y . ?\375)
100 (?z . ?\274) (?' . ?\264) (?\ . ?'))
101 (?` (?A . ?\241) (?C . ?\307) (?E . ?\312) (?L . ?\243) (?S . ?\252)
102 (?T . ?\336) (?Z . ?\257) (?a . ?\261) (?l . ?\263) (?c . ?\347)
103 (?e . ?\352) (?s . ?\272) (?t . ?\376) (?z . ?\277) (?` . ?\252)
104 (?. . ?\377) (?\ . ?`))
105 (?^ (?A . ?\302) (?O . ?\324) (?a . ?\342) (?o . ?\364)
106 (?^ . ?^) ; no special code?
108 (?\" (?A . ?\304) (?E . ?\313) (?O . ?\326) (?U . ?\334) (?a . ?\344)
109 (?e . ?\353) (?o . ?\366) (?s . ?\337) (?u . ?\374) (?\" . ?\250)
111 (?\~ (?A . ?\303) (?C . ?\310) (?D . ?\317) (?L . ?\245) (?N . ?\322)
112 (?O . ?\325) (?R . ?\330) (?S . ?\251) (?T . ?\253) (?U . ?\333)
113 (?Z . ?\256) (?a . ?\323) (?c . ?\350) (?d . ?\357) (?l . ?\265)
114 (?n . ?\362) (?o . ?\365) (?r . ?\370) (?s . ?\271) (?t . ?\273)
115 (?u . ?\373) (?z . ?\276)
116 (?v . ?\242) ; v accent
117 (?\~ . ?\242) ; v accent
118 (?\. . ?\270) ; cedilla accent
122 (?' (?A . ?\301) (?E . ?\311) (?I . ?\315) (?O . ?\323) (?U . ?\332)
123 (?Y . ?\335) (?a . ?\341) (?e . ?\351) (?i . ?\355) (?o . ?\363)
124 (?u . ?\372) (?y . ?\375) (?' . ?\264) (?\ . ?'))
125 (?` (?A . ?\300) (?E . ?\310) (?I . ?\314) (?O . ?\322) (?U . ?\331)
126 (?a . ?\340) (?e . ?\350) (?i . ?\354) (?o . ?\362) (?u . ?\371)
128 (?^ (?A . ?\302) (?E . ?\312) (?I . ?\316) (?O . ?\324) (?U . ?\333)
129 (?a . ?\342) (?e . ?\352) (?i . ?\356) (?o . ?\364) (?u . ?\373)
131 (?\" (?A . ?\304) (?E . ?\313) (?I . ?\317) (?O . ?\326) (?U . ?\334)
132 (?a . ?\344) (?e . ?\353) (?i . ?\357) (?o . ?\366) (?s . ?\337)
133 (?u . ?\374) (?y . ?\377) (?\" . ?\250) (?\ . ?\"))
134 (?\~ (?A . ?\303) (?C . ?\307) (?D . ?\320) (?N . ?\321) (?O . ?\325)
135 (?T . ?\336) (?a . ?\343) (?c . ?\347) (?d . ?\360) (?n . ?\361)
136 (?o . ?\365) (?t . ?\376) (?> . ?\273) (?< . ?\253) (?\~ . ?\270)
137 (?! . ?\241) (?? . ?\277)
139 (?\/ (?A . ?\305) (?E . ?\306) (?O . ?\330) (?a . ?\345) (?e . ?\346)
140 (?o . ?\370) (?\/ . ?\260) (?\ . ?\/))))
141 "List of language-specific customizations for the ISO Accents mode.
143 Each element of the list is of the form
146 (PSEUDO-ACCENT MAPPINGS)
147 (PSEUDO-ACCENT MAPPINGS)
150 LANGUAGE is a string naming the language.
151 PSEUDO-ACCENT is a char specifying an accent key.
152 MAPPINGS are cons cells of the form (CHAR . ISO-CHAR).
154 The net effect is that the key sequence PSEUDO-ACCENT CHAR is mapped
155 to ISO-CHAR on input.")
157 (defvar iso-language nil
158 "Language for which ISO Accents mode is currently customized.
159 Change it with the `iso-accents-customize' function.")
161 (defvar iso-accents-list nil
162 "Association list for ISO accent combinations, for the chosen language.")
164 (defvar iso-accents-mode nil
165 "*Non-nil enables ISO Accents mode.
166 Setting this variable makes it local to the current buffer.
167 See the function `iso-accents-mode'.")
168 (make-variable-buffer-local 'iso-accents-mode)
170 (defvar iso-accents-enable '(?' ?` ?^ ?\" ?~ ?/)
171 "*List of accent keys that become prefixes in ISO Accents mode.
172 The default is (?' ?` ?^ ?\" ?~ ?/), which contains all the supported
173 accent keys. If you set this variable to a list in which some of those
174 characters are missing, the missing ones do not act as accents.
176 Note that if you specify a language with `iso-accents-customize',
177 that can also turn off certain prefixes (whichever ones are not needed in
178 the language you choose).")
180 (defun iso-accents-accent-key (prompt)
181 "Modify the following character by adding an accent to it."
182 ;; Pick up the accent character.
183 (if (and iso-accents-mode
184 (memq last-input-char iso-accents-enable))
185 (iso-accents-compose prompt)
186 (char-to-string last-input-char)))
188 (defun iso-accents-compose (prompt)
189 (let* ((first-char last-input-char)
190 (list (assq first-char iso-accents-list))
191 ;; Wait for the second key and look up the combination.
192 (second-char (if (or prompt
193 (not (eq (key-binding "a")
194 'self-insert-command))
195 ;; Not at start of a key sequence.
196 (> (length (this-single-command-keys)) 1)
197 ;; Called from anything but the command loop.
201 (or prompt "Compose with ")
206 (delete-region (1- (point)) (point)))))
207 (entry (cdr (assq second-char list))))
209 ;; Found it: return the mapped char
211 ;; Otherwise, advance and schedule the second key for execution.
212 (setq unread-command-events (list second-char))
213 (vector first-char))))
215 ;; It is a matter of taste if you want the minor mode indicated
216 ;; in the mode line...
217 ;; If so, uncomment the next four lines.
218 ;; (or (assq 'iso-accents-mode minor-mode-map-alist)
219 ;; (setq minor-mode-alist
220 ;; (append minor-mode-alist
221 ;; '((iso-accents-mode " ISO-Acc")))))
224 (defun iso-accents-mode (&optional arg)
225 "Toggle ISO Accents mode, in which accents modify the following letter.
226 This permits easy insertion of accented characters according to ISO-8859-1.
227 When Iso-accents mode is enabled, accent character keys
228 \(`, ', \", ^, / and ~) do not self-insert; instead, they modify the following
229 letter key so that it inserts an ISO accented letter.
231 You can customize ISO Accents mode to a particular language
232 with the command `iso-accents-customize'.
234 Special combinations: ~c gives a c with cedilla,
235 ~d gives an Icelandic eth (d with dash).
236 ~t gives an Icelandic thorn.
237 \"s gives German sharp s.
238 /a gives a with ring.
239 /e gives an a-e ligature.
240 ~< and ~> give guillemots.
241 ~! gives an inverted exclamation mark.
242 ~? gives an inverted question mark.
244 With an argument, a positive argument enables ISO Accents mode,
245 and a negative argument disables it."
250 ;; Negative arg means switch it off.
251 (<= (prefix-numeric-value arg) 0)
252 ;; No arg means toggle.
254 (setq iso-accents-mode nil)
256 ;; Enable electric accents.
257 (setq iso-accents-mode t)))
259 (defun iso-accents-customize (language)
260 "Customize the ISO accents machinery for a particular language.
261 It selects the customization based on the specifications in the
262 `iso-languages' variable."
263 (interactive (list (completing-read "Language: " iso-languages nil t)))
264 (let ((table (assoc language iso-languages))
267 (error "Unknown language '%s'" language)
268 (setq iso-language language
269 iso-accents-list (cdr table))
270 (if key-translation-map
271 (substitute-key-definition
272 'iso-accents-accent-key nil key-translation-map)
273 (setq key-translation-map (make-sparse-keymap)))
274 ;; Set up translations for all the characters that are used as
275 ;; accent prefixes in this language.
276 (setq tail iso-accents-list)
278 (define-key key-translation-map (vector (car (car tail)))
279 'iso-accents-accent-key)
280 (setq tail (cdr tail))))))
282 (defun iso-accentuate (start end)
283 "Convert two-character sequences in region into accented characters.
284 Noninteractively, this operates on text from START to END.
285 This uses the same conversion that ISO Accents mode uses for type-in."
289 (narrow-to-region start end)
293 (while (< (point) end)
294 (if (and (memq (preceding-char) iso-accents-enable)
295 (setq entry (cdr (assq (following-char) (assq (preceding-char) iso-accents-list)))))
301 (forward-char 1)))))))
303 (defun iso-accent-rassoc-unit (value alist)
305 (while (and alist (not elt))
306 (setq acc (car (car alist))
307 elt (car (rassq value (cdr (car alist))))
312 (defun iso-unaccentuate (start end)
313 "Convert accented characters in the region into two-character sequences.
314 Noninteractively, this operates on text from START to END.
315 This uses the opposite of the conversion done by ISO Accents mode for type-in."
319 (narrow-to-region start end)
322 (while (< (point) end)
323 (if (and (> (following-char) 127)
324 (setq entry (iso-accent-rassoc-unit (following-char)
328 (insert (car entry) (cdr entry))
330 (forward-char 1)))))))
332 (defun iso-deaccentuate (start end)
333 "Convert accented characters in the region into unaccented characters.
334 Noninteractively, this operates on text from START to END."
338 (narrow-to-region start end)
341 (while (< (point) end)
342 (if (and (> (following-char) 127)
343 (setq entry (iso-accent-rassoc-unit (following-char)
347 (insert (cdr entry)))
348 (forward-char 1)))))))
350 ;; Set up the default settings.
351 (iso-accents-customize "latin-1")
353 ;; Use Iso-Accents mode in the minibuffer
354 ;; if it was in use in the previous buffer.
355 (defun iso-acc-minibuf-setup ()
356 (setq iso-accents-mode
358 (set-buffer (window-buffer minibuffer-scroll-window))
361 (add-hook 'minibuf-setup-hook 'iso-acc-minibuf-setup)
363 ;;; iso-acc.el ends here