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1 ;;; ogonek.el --- change the encoding of Polish diacritics
2
3 ;; Copyright (C) 1997-1998, 2001-2011 Free Software Foundation, Inc.
4
5 ;; Author: W{\l}odek Bzyl
6 ;; Ryszard Kubiak
7 ;; Maintainer: Ryszard Kubiak <rysiek@ipipan.gda.pl>
8 ;; Keywords: i18n
9
10 ;; This file is part of GNU Emacs.
11
12 ;; GNU Emacs is free software: you can redistribute it and/or modify
13 ;; it under the terms of the GNU General Public License as published by
14 ;; the Free Software Foundation, either version 3 of the License, or
15 ;; (at your option) any later version.
16
17 ;; GNU Emacs is distributed in the hope that it will be useful,
18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 ;; GNU General Public License for more details.
21
22 ;; You should have received a copy of the GNU General Public License
23 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
24
25 ;;; Commentary:
26
27 ;; To use this library load it using
28 ;; M-x load-library [enter] ogonek
29 ;; Then, you may get a short info by calling one of
30 ;; M-x ogonek-jak -- in Polish
31 ;; M-x ogonek-how -- in English "
32
33 ;;; Code:
34
35 (defgroup ogonek nil
36 "Change the encoding of Polish diacritic characters."
37 :prefix "ogonek-"
38 :group 'i18n)
39
40 (defconst ogonek-name-encoding-alist
41 '(("ascii" . (?A ?C ?E ?L ?N ?O ?S ?Z ?Z
42 ?a ?c ?e ?l ?n ?o ?s ?z ?z))
43 ("iso8859-2" . (161 198 202 163 209 211 166 172 175
44 177 230 234 179 241 243 182 188 191))
45 ("mazovia" . (143 149 144 156 165 163 152 160 161
46 134 141 145 146 164 162 158 166 167))
47 ("windows-EE" . (165 198 202 163 209 211 140 143 175
48 185 230 234 179 241 243 156 159 191))
49 ("windows-PL" . (165 198 202 163 209 211 140 143 175
50 185 230 234 179 241 243 156 159 191))
51 ("latin-2" . (164 143 168 157 227 224 151 141 189
52 165 134 169 136 228 162 152 171 190))
53 ("CP852" . (164 143 168 157 227 224 151 141 189
54 165 134 169 136 228 162 152 171 190))
55 ("MeX" . (129 130 134 138 139 211 145 153 155
56 161 162 166 170 171 243 177 185 187))
57 ("CorelDraw" . (197 242 201 163 209 211 255 225 237
58 229 236 230 198 241 243 165 170 186))
59 ("Amiga" . (194 202 203 206 207 211 212 218 219
60 226 234 235 238 239 243 244 250 251))
61 ("Mac" . (132 140 162 252 193 238 229 143 251
62 136 141 171 184 196 151 230 144 253))
63 )
64 "The constant `ogonek-name-encoding-alist' is a list of (NAME.LIST) pairs.
65 Each LIST contains codes for 18 Polish diacritic characters. The codes
66 are given in the following order:
67 Aogonek Cacute Eogonek Lslash Nacute Oacute Sacute Zacute Zdotaccent
68 aogonek cacute eogonek lslash nacute oacute sacute zacute zdotaccent.")
69
70 ;; ------ A Little Info in Polish ---------------
71
72 (defconst ogonek-informacja
73 " FUNKCJE INTERAKCYJNE UDOST/EPNIANE PRZEZ BIBLIOTEK/E `ogonek'.
74
75 Je/sli czytasz ten tekst, to albo przegl/adasz plik /xr/od/lowy
76 biblioteki `ogonek.el', albo wywo/la/le/s polecenie `ogonek-jak'.
77 W drugim przypadku mo/zesz usun/a/c tekst z ekranu, stosuj/ac
78 polecenie `M-x kill-buffer'.
79
80 Niniejsza biblioteka dostarcza funkcji do zmiany kodowania polskich
81 znak/ow diakrytycznych. Funkcje te mo/zna pogrupowa/c nast/epuj/aco.
82
83 1. `ogonek-recode-region' oraz `ogonek-recode-buffer'
84 przekodowuj/a zaznaczony fragment wzgl/ednie ca/ly buffor.
85 Po wywo/laniu interakcyjnym funkcji zadawane s/a
86 pytania o parametry przekodowania: nazw/e kodowania
87 w tek/scie /xr/od/lowym i nazw/e kodowania docelowego.
88 Poni/zsze przyk/lady powinny wyja/sni/c, jakich parametr/ow
89 oczekuj/a wymienione funkcje:
90
91 (ogonek-recode-region (poczatek-fragmentu) (koniec-fragmentu)
92 nazwa-kodowania-w-tekscie-zrodlowym nazwa-kodowania-docelowa)
93 (ogonek-recode-buffer
94 nazwa-kodowania-w-tekscie-zrodlowym nazwa-kodowania-docelowa)
95
96 2. `ogonek-prefixify-region' oraz `ogonek-prefixify-buffer'
97 s/lu/z/a do wprowadzania notacji prefiksowej.
98
99 (ogonek-prefixify-region (poczatek-fragmentu) (koniec-fragmentu)
100 nazwa-kodowania-w-tekscie-zrodlowym znak-prefiksu)
101 (ogonek-prefixify-buffer
102 nazwa-kodowania-w-tekscie-zrodlowym znak-prefiksu)
103
104 3. `ogonek-deprefixify-region' oraz `ogonek-deprefixify-buffer'
105 s/lu/z/a do usuwania notacji prefiksowej.
106
107 (ogonek-deprefixify-region (poczatek-fragmentu) (koniec-fragmentu)
108 znak-prefiksu nazwa-kodowania-docelowa)
109 (ogonek-prefixify-buffer
110 znak-prefiksu nazwa-kodowania-docelowa)
111
112 U/zycie klawisza TAB w trybie interakcyjnym powoduje wy/swietlenie
113 listy dopuszczalnych nazw kod/ow, pami/etanych w sta/lej
114 `ogonek-name-encoding-alist'.
115
116 Funkcje biblioteki odwo/luj/a si/e do pi/eciu zmiennych, kt/ore
117 przechowuj/a podpowiedzi do zadawanych pyta/n. Nazwy tych zmiennych
118 oraz ich warto/sci domy/slne s/a nast/epuj/ace:
119
120 ogonek-from-encoding iso8859-2
121 ogonek-to-encoding ascii
122 ogonek-prefix-char /
123 ogonek-prefix-from-encoding iso8859-2
124 ogonek-prefix-to-encoding iso8859-2
125
126 Powy/zsze warto/sci domy/slne mo/zna zmieni/c przez umieszczenie w pliku
127 konfiguracyjnym `~/.emacs' odpowiednich przypisa/n, na przyk/lad:
128
129 (setq ogonek-prefix-char ?/)
130 (setq ogonek-prefix-to-encoding \"iso8859-2\")
131
132 Zamiast wczytywania ca/lej biblioteki `ogonek.el' mo/zna w pliku
133 `~/.emacs' za/z/ada/c wczytania wybranych funkcji, na dodatek dopiero
134 w chwili ich rzeczywistego u/zycia:
135
136 (autoload 'ogonek-jak \"ogonek\")
137 (autoload 'ogonek-recode-region \"ogonek\")
138 (autoload 'ogonek-prefixify-region \"ogonek\")
139 (autoload 'ogonek-deprefixify-region \"ogonek\")
140
141 Cz/esto wyst/epuj/ace kombinacje wywo/la/n funkcji mo/zna dla wygody
142 skr/oci/c i przypisa/c klawiszom. Oto praktyczne przyk/lady:
143
144 (defun deprefixify-iso8859-2-region (start end)
145 (interactive \"*r\")
146 (ogonek-deprefixify-region start end ?/ \"iso8859-2\"))
147 (global-set-key \"\\C-cd\" 'deprefixify-iso8859-2-region) ; ctrl-c d
148
149 (defun mazovia-to-iso8859-2 (start end)
150 (interactive \"*r\")
151 (ogonek-recode-region start end \"mazovia\" \"iso8859-2\"))
152 (global-set-key \"\\C-cr\" 'mazovia-to-iso8859-2) ; ctrl-c r
153
154 (defun prefixify-iso8859-2-region (start end)
155 (interactive \"*r\")
156 (ogonek-prefixify-region start end \"iso8859-2\" ?/))
157 (global-set-key \"\\C-cp\" 'prefixify-iso8859-2-region) ; ctrl-c p
158
159 Ka/zd/a operacj/e przekodowania mo/zna w ca/lo/sci odwo/la/c
160 przez wykonanie polecenia `undo'.")
161
162 (defun ogonek-jak ()
163 "Display `ogonek-informacja' in an auxiliary *ogonek-jak* buffer."
164 (interactive)
165 (set-buffer (get-buffer-create " *ogonek-jak*"))
166 (insert ogonek-informacja)
167 (switch-to-buffer " *ogonek-jak*")
168 (goto-char (point-min)))
169
170 ;; ------ A Little Info in English --------
171
172 (defconst ogonek-information
173 " THE INTERACTIVE FUNCTIONS PROVIDED BY THE LIBRARY `ogonek'.
174
175 If you read this text then you are either looking at the library's
176 source text or you have called the `ogonek-how' command. In the
177 latter case you may remove this text using `M-x kill-buffer'.
178
179 The library provides functions for changing the encoding of Polish
180 diacritic characters, the ones with an `ogonek' below or above them.
181 The functions come in the following groups.
182
183 1. `ogonek-recode-region' and `ogonek-recode-buffer' to change
184 between one-character encodings, such as `iso-8859-2', `mazovia',
185 plain `ascii' or `TeX'. As the names suggest you may recode
186 either the entire current buffer or just a marked region
187 in it. You may use the functions interactively as commands.
188 Once you call a command you will be asked about the code
189 currently used in your text and the target encoding, the one
190 you want to get. The following example shows a non-interactive
191 use of the functions in a program. This also illustrates what
192 type of parameters the functions expect to be called with:
193
194 (ogonek-recode-region
195 (region-beginning) (region-end) from-code-name to-code-name)
196 (ogonek-recode-buffer from-code-name to-code-name)
197
198 2. `ogonek-prefixify-region' and `ogonek-prefixify-buffer' for
199 introducing prefix notation:
200
201 (ogonek-prefixify-region
202 (region-beginning) (region-end) from-code-name prefix-char)
203 (ogonek-prefixify-buffer from-code-name prefix-char)
204
205 3. `ogonek-deprefixify-region' and `ogonek-deprefixify-buffer' for
206 removing prefix notation:
207
208 (ogonek-deprefixify-region
209 (region-beginning) (region-end) prefix-char to-code-name)
210 (ogonek-prefixify-buffer prefix-char to-code-name)
211
212 The TAB character used in interactive mode makes `emacs'
213 display the list of encodings recognized by the library. The list
214 is stored in the constant `ogonek-name-encoding-alist'.
215
216 The `ogonek' functions refer to five variables in which the suggested
217 answers to dialogue questions are stored. The variables and their
218 default values are:
219
220 ogonek-from-encoding iso8859-2
221 ogonek-to-encoding ascii
222 ogonek-prefix-char /
223 ogonek-prefix-from-encoding iso8859-2
224 ogonek-prefix-to-encoding iso8859-2
225
226 The above default values can be changed by placing appropriate settings
227 in the '~/.emacs' file:
228
229 (setq ogonek-prefix-char ?/)
230 (setq ogonek-prefix-to-encoding \"iso8859-2\")
231
232 Instead of loading the whole library `ogonek' it may be better to
233 autoload the needed functions, for example by placing in `~/.emacs':
234
235 (autoload 'ogonek-how \"ogonek\")
236 (autoload 'ogonek-recode-region \"ogonek\")
237 (autoload 'ogonek-prefixify-region \"ogonek\")
238 (autoload 'ogonek-deprefixify-region \"ogonek\")
239
240 The most frequent function calls can be abbreviated and assigned to
241 keyboard keys. Here are a few practical examples:
242
243 (defun deprefixify-iso8859-2-region (start end)
244 (interactive \"*r\")
245 (ogonek-deprefixify-region start end ?/ \"iso8859-2\"))
246 (global-set-key \"\\C-cd\" 'deprefixify-iso8859-2-region) ; ctrl-c d
247
248 (defun mazovia-to-iso8859-2 (start end)
249 (interactive \"*r\")
250 (ogonek-recode-region start end \"mazovia\" \"iso8859-2\"))
251 (global-set-key \"\\C-cr\" 'mazovia-to-iso8859-2) ; ctrl-c r
252
253 (defun prefixify-iso8859-2-region (start end)
254 (interactive \"*r\")
255 (ogonek-prefixify-region start end \"iso8859-2\" ?/))
256 (global-set-key \"\\C-cp\" 'prefixify-iso8859-2-region) ; ctrl-c p
257
258 Each recoding operation can be called off using the `undo' command.")
259
260 (defun ogonek-how ()
261 "Display `ogonek-information' in an auxiliary *recode-how* buffer."
262 (interactive "*")
263 (set-buffer (get-buffer-create " *ogonek-how*"))
264 (insert ogonek-information)
265 (switch-to-buffer " *ogonek-how*")
266 (goto-char (point-min)))
267
268 ;; ---- Variables keeping the suggested answers to dialogue questions -----
269 (defvar ogonek-encoding-choices
270 (cons 'choice
271 (mapcar (lambda (x) (list 'const (car x)))
272 ogonek-name-encoding-alist))
273 "List of ogonek encodings. Used only for customization.")
274 (defcustom ogonek-from-encoding "iso8859-2"
275 "Encoding in the source file of recoding."
276 :type ogonek-encoding-choices
277 :group 'ogonek)
278 (defcustom ogonek-to-encoding "ascii"
279 "Encoding in the target file of recoding."
280 :type ogonek-encoding-choices
281 :group 'ogonek)
282 (defcustom ogonek-prefix-char ?/
283 "Prefix character for prefix encodings."
284 :type 'character
285 :group 'ogonek)
286 (defcustom ogonek-prefix-from-encoding "iso8859-2"
287 "Encoding in the source file subject to prefixifation."
288 :type ogonek-encoding-choices
289 :group 'ogonek)
290 (defcustom ogonek-prefix-to-encoding "iso8859-2"
291 "Encoding in the target file subject to deprefixifation."
292 :type ogonek-encoding-choices
293 :group 'ogonek)
294
295 ;; ---- Auxiliary functions for reading parameters in interactive mode ----
296
297 (defun ogonek-read-encoding (prompt default-name-var)
298 "Read encoding name with completion based on `ogonek-name-encoding-alist'.
299 Store the name in the parameter-variable DEFAULT-NAME-VAR.
300 PROMPT is a string to be shown when the user is asked for a name."
301 (let ((encoding
302 (completing-read
303 (format "%s (default %s): " prompt (eval default-name-var))
304 ogonek-name-encoding-alist nil t)))
305 ;; change the default name to the one just read
306 (set default-name-var
307 (if (string= encoding "") (eval default-name-var) encoding))
308 ;; return the new default as the name you read
309 (eval default-name-var)))
310
311 (defun ogonek-read-prefix (prompt default-prefix-var)
312 "Read a prefix character for prefix notation.
313 The result is stored in the variable DEFAULT-PREFIX-VAR.
314 PROMPT is a string to be shown when the user is asked for a new prefix."
315 (let ((prefix-string
316 (read-string
317 (format "%s (default %s): " prompt
318 (char-to-string (eval default-prefix-var))))))
319 (if (> (length prefix-string) 1)
320 (error "! Only one character expected")
321 ;; set the default prefix character to the one just read
322 (set default-prefix-var
323 (if (string= prefix-string "")
324 (eval default-prefix-var)
325 (string-to-char prefix-string)))
326 ;; the new default prefix is the function's result:
327 (eval default-prefix-var))))
328
329 (defun ogonek-lookup-encoding (encoding)
330 "Pick up an association for ENCODING in `ogonek-name-encoding-alist'.
331 Before returning a result test whether the string ENCODING is in
332 the list `ogonek-name-encoding-alist'"
333 (let ((code-list (assoc encoding ogonek-name-encoding-alist)))
334 (if (null code-list)
335 (error "! Name `%s' not known in `ogonek-name-encoding-alist'"
336 encoding)
337 (cdr code-list))))
338
339 ;; ---- An auxiliary function for zipping two lists of equal length ----
340
341 (defun ogonek-zip-lists (xs ys)
342 "Build a list of pairs from lists XS and YS of the same length."
343 (let ((pairs nil))
344 (while xs
345 (setq pairs (cons (cons (car xs) (car ys)) pairs))
346 (setq xs (cdr xs))
347 (setq ys (cdr ys)))
348 ;; `pairs' are the function's result
349 pairs))
350
351 ;; ---- An auxiliary function building a one-to-one recoding table -----
352
353 (defun ogonek-build-table (recoding-pairs)
354 "Build a table required by Emacs's `translate-region' function.
355 RECODING-PAIRS is a list of character pairs for which recoding
356 is not an identity.
357 By using the built-in `translate-region' function
358 we gain better performance compared to converting characters
359 by a hand-written routine as it is done for prefix encodings."
360 (let ((table (make-string 256 0))
361 (i 0))
362 (while (< i 256)
363 (aset table i i)
364 (setq i (1+ i)))
365 ;; make changes in `table' according to `recoding-pairs'
366 (while recoding-pairs
367 (aset table (car (car recoding-pairs)) (cdr (car recoding-pairs)))
368 (setq recoding-pairs (cdr recoding-pairs)))
369 ;; return the table just built
370 table))
371
372 ;; ---- Commands for one-to-one recoding -------------------------------
373
374 (defun ogonek-recode-region (start end from-encoding to-encoding)
375 "Recode text in a marked region in one-to-one manner.
376 When called interactively ask the user for the names of the FROM-
377 and TO- encodings."
378 (interactive (progn (barf-if-buffer-read-only)
379 (list
380 (region-beginning)
381 (region-end)
382 (ogonek-read-encoding "From code" 'ogonek-from-encoding)
383 (ogonek-read-encoding "To code" 'ogonek-to-encoding))))
384 (save-excursion
385 (translate-region
386 start end
387 (ogonek-build-table
388 (ogonek-zip-lists
389 (ogonek-lookup-encoding from-encoding)
390 (ogonek-lookup-encoding to-encoding))))))
391
392 (defun ogonek-recode-buffer (from-encoding to-encoding)
393 "Call `ogonek-recode-region' on the entire buffer.
394 When called interactively ask the user for the names of the FROM-
395 and TO- encodings."
396 (interactive (progn (barf-if-buffer-read-only)
397 (list
398 (ogonek-read-encoding "From code" 'ogonek-from-encoding)
399 (ogonek-read-encoding "To code" 'ogonek-to-encoding))))
400 (ogonek-recode-region
401 (point-min) (point-max) from-encoding to-encoding))
402
403 ;; ---- Recoding with prefix notation -------------------------------
404
405 (defconst ogonek-prefix-code '(?A ?C ?E ?L ?N ?O ?S ?X ?Z
406 ?a ?c ?e ?l ?n ?o ?s ?x ?z))
407
408 (defun ogonek-prefixify-region (start end from-encoding prefix-char)
409 "In a region, replace FROM-encoded Polish characters with PREFIX pairs.
410 A PREFIX pair generated consists of PREFIX-CHAR and the respective
411 character listed in the `ogonek-prefix-code' constant.
412 PREFIX-CHAR itself gets doubled."
413 (interactive (progn (barf-if-buffer-read-only)
414 (list
415 (region-beginning)
416 (region-end)
417 (ogonek-read-encoding "From code" 'ogonek-prefix-from-encoding)
418 (ogonek-read-prefix "Prefix character" 'ogonek-prefix-char))))
419 (let*
420 ((from-code (ogonek-lookup-encoding from-encoding))
421 (to-code ogonek-prefix-code)
422 (recoding-pairs ; `ogonek-prefix-char' added for doubling
423 (ogonek-zip-lists
424 (cons prefix-char from-code)
425 (cons prefix-char to-code))))
426 (save-excursion
427 (goto-char start)
428 (while (< (point) end)
429 (let ((pair (assoc (following-char) recoding-pairs)))
430 (if (null pair)
431 ;; not a Polish character -- skip it
432 (forward-char 1)
433 ;; Polish character -- insert a prefix pair instead
434 (delete-char 1)
435 (insert ogonek-prefix-char)
436 (insert (cdr pair))
437 ;; the region is now one character longer
438 (setq end (1+ end))))))))
439
440 (defun ogonek-prefixify-buffer (from-encoding prefix-char)
441 "Call `ogonek-prefixify-region' on the entire buffer."
442 (interactive (progn (barf-if-buffer-read-only)
443 (list
444 (ogonek-read-encoding "From code" 'ogonek-prefix-from-encoding)
445 (ogonek-read-prefix "Prefix character" 'ogonek-prefix-char))))
446 (ogonek-prefixify-region
447 (point-min) (point-max) from-encoding prefix-char))
448
449 (defun ogonek-deprefixify-region (start end prefix-char to-encoding)
450 "In a region, replace PREFIX pairs with their corresponding TO-encodings.
451 PREFIX-CHAR followed by a Polish character from the `ogonek-prefix-code'
452 list is replaced with the corresponding TO-encoded character. A doubled
453 PREFIX-CHAR gets replaced with a single one. A combination of PREFIX-CHAR
454 followed by a non-Polish character, that is one not listed in the
455 `ogonek-prefix-code' constant, is left unchanged."
456 (interactive (progn (barf-if-buffer-read-only)
457 (list (region-beginning)
458 (region-end)
459 (ogonek-read-prefix
460 "Prefix character" 'ogonek-prefix-char)
461 (ogonek-read-encoding
462 "To code" 'ogonek-prefix-to-encoding))))
463 (let*
464 ((from-code ogonek-prefix-code)
465 (to-code (ogonek-lookup-encoding to-encoding))
466 (recoding-pairs
467 (ogonek-zip-lists
468 (cons prefix-char from-code)
469 (cons prefix-char to-code))))
470 (save-excursion
471 (goto-char start)
472 (while (< (point) end)
473 (forward-char 1)
474 (if (or (not (= (preceding-char) prefix-char)) (= (point) end))
475 ;; non-prefix character or the end-of-region -- do nothing
476 ()
477 ;; now, we can check the next character
478 (let ((pair (assoc (following-char) recoding-pairs)))
479 (if (null pair)
480 ;; `following-char' is not a Polish character nor it is
481 ;; `prefix-char' since the one is among `recoding-pairs'
482 (forward-char 1)
483 ;; else prefix followed by a Polish character has been found
484 ;; replace it by the corresponding Polish character
485 (backward-char 1)
486 (delete-char 2)
487 (insert (cdr pair))
488 ;; the region got shorter by one character
489 (setq end (1- end)))))))))
490
491 (defun ogonek-deprefixify-buffer (prefix-char to-encoding)
492 "Call `ogonek-deprefixify-region' on the entire buffer."
493 (interactive (progn (barf-if-buffer-read-only)
494 (list
495 (ogonek-read-prefix "Prefix character" 'ogonek-prefix-char)
496 (ogonek-read-encoding "To code" 'ogonek-prefix-to-encoding))))
497 (ogonek-deprefixify-region
498 (point-min) (point-max) prefix-char to-encoding))
499
500 (provide 'ogonek)
501
502 ;;; ogonek.el ends here