summaryrefslogtreecommitdiff
path: root/lisp/international/ogonek.el
blob: 7c522698ead07809d7ea83b326d572394f7dce0a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
;;; ogonek.el --- change the encoding of Polish diacritics

;; Copyright (C) 1997, 1998, 2001  Free Software Foundation, Inc.

;; Author: W{\l}odek Bzyl, Ryszard Kubiak
;; Maintainer: rysiek@ipipan.gda.pl (Ryszard Kubiak)
;; Keywords: i18n

;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Commentary:

;; To use this library load it using
;;                 M-x load-library [enter] ogonek
;;              Then, you may get a short info by calling one of
;;                 M-x ogonek-jak        -- in Polish
;;                 M-x ogonek-how        -- in English  "

;;; Code:

(defgroup ogonek nil
  "Change the encoding of Polish diacritic characters."
  :prefix "ogonek-"
  :group 'i18n)

(defconst ogonek-name-encoding-alist
  '(("ascii"      . (?A  ?C  ?E  ?L  ?N  ?O  ?S  ?Z  ?Z
                     ?a  ?c  ?e  ?l  ?n  ?o  ?s  ?z  ?z))
    ("iso8859-2"  . (161 198 202 163 209 211 166 172 175
                     177 230 234 179 241 243 182 188 191))
    ("mazovia"    . (143 149 144 156 165 163 152 160 161
                     134 141 145 146 164 162 158 166 167))
    ("windows-EE" . (165 198 202 163 209 211 140 143 175
                     185 230 234 179 241 243 156 159 191))
    ("windows-PL" . (165 198 202 163 209 211 140 143 175
                     185 230 234 179 241 243 156 159 191))
    ("latin-2"    . (164 143 168 157 227 224 151 141 189
                     165 134 169 136 228 162 152 171 190))
    ("CP852"      . (164 143 168 157 227 224 151 141 189
                     165 134 169 136 228 162 152 171 190))
    ("MeX"        . (129 130 134 138 139 211 145 153 155
                     161 162 166 170 171 243 177 185 187))
    ("CorelDraw"  . (197 242 201 163 209 211 255 225 237
                     229 236 230 198 241 243 165 170 186))
    ("Amiga"      . (194 202 203 206 207 211 212 218 219
                     226 234 235 238 239 243 244 250 251))
    ("Mac"        . (132 140 162 252 193 238 229 143 251
                     136 141 171 184 196 151 230 144 253))
 )
  "The constant `ogonek-name-encoding-alist' is a list of (NAME.LIST) pairs.
Each LIST contains codes for 18 Polish diacritic characters. The codes
are given in the following order:
  Aogonek Cacute Eogonek Lslash Nacute Oacute Sacute Zacute Zdotaccent
  aogonek cacute eogonek lslash nacute oacute sacute zacute zdotaccent.")

;; ------ A Little Info in Polish ---------------

(defconst ogonek-informacja
  "   FUNKCJE INTERAKCYJNE UDOST/EPNIANE PRZEZ BIBLIOTEK/E `ogonek'.

Je/sli czytasz ten tekst, to albo przegl/adasz plik /xr/od/lowy
biblioteki `ogonek.el', albo wywo/la/le/s polecenie `ogonek-jak'.
W drugim przypadku mo/zesz usun/a/c tekst z ekranu, stosuj/ac
polecenie `M-x kill-buffer'.

Niniejsza biblioteka dostarcza funkcji do zmiany kodowania polskich
znak/ow diakrytycznych. Funkcje te mo/zna pogrupowa/c nast/epuj/aco.

 1. `ogonek-recode-region' oraz `ogonek-recode-buffer'
    przekodowuj/a zaznaczony fragment wzgl/ednie ca/ly buffor.
    Po wywo/laniu interakcyjnym funkcji zadawane s/a
    pytania o parametry przekodowania: nazw/e kodowania
    w tek/scie /xr/od/lowym i nazw/e kodowania docelowego.
    Poni/zsze przyk/lady powinny wyja/sni/c, jakich parametr/ow
    oczekuj/a wymienione funkcje:

      (ogonek-recode-region (poczatek-fragmentu) (koniec-fragmentu)
         nazwa-kodowania-w-tekscie-zrodlowym nazwa-kodowania-docelowa)
      (ogonek-recode-buffer
         nazwa-kodowania-w-tekscie-zrodlowym nazwa-kodowania-docelowa)

 2. `ogonek-prefixify-region' oraz `ogonek-prefixify-buffer'
    s/lu/z/a do wprowadzania notacji prefiksowej.

      (ogonek-prefixify-region (poczatek-fragmentu) (koniec-fragmentu)
         nazwa-kodowania-w-tekscie-zrodlowym znak-prefiksu)
      (ogonek-prefixify-buffer
         nazwa-kodowania-w-tekscie-zrodlowym znak-prefiksu)

 3. `ogonek-deprefixify-region' oraz `ogonek-deprefixify-buffer'
    s/lu/z/a do usuwania notacji prefiksowej.

      (ogonek-deprefixify-region (poczatek-fragmentu) (koniec-fragmentu)
         znak-prefiksu nazwa-kodowania-docelowa)
      (ogonek-prefixify-buffer
         znak-prefiksu nazwa-kodowania-docelowa)

 U/zycie klawisza TAB w trybie interakcyjnym powoduje wy/swietlenie
 listy dopuszczalnych nazw kod/ow, pami/etanych w sta/lej
 `ogonek-name-encoding-alist'.

 Funkcje biblioteki odwo/luj/a si/e do pi/eciu zmiennych, kt/ore
 przechowuj/a podpowiedzi do zadawanych pyta/n. Nazwy tych zmiennych
 oraz ich warto/sci domy/slne s/a nast/epuj/ace:

   ogonek-from-encoding           iso8859-2
   ogonek-to-encoding             ascii
   ogonek-prefix-char              /
   ogonek-prefix-from-encoding    iso8859-2
   ogonek-prefix-to-encoding      iso8859-2

 Powy/zsze warto/sci domy/slne mo/zna zmieni/c przez umieszczenie w pliku
 konfiguracyjnym `~/.emacs' odpowiednich przypisa/n, na przyk/lad:

   (setq ogonek-prefix-char ?/)
   (setq ogonek-prefix-to-encoding \"iso8859-2\")

 Zamiast wczytywania ca/lej biblioteki `ogonek.el' mo/zna w pliku
 `~/.emacs' za/z/ada/c wczytania wybranych funkcji, na dodatek dopiero
 w chwili ich rzeczywistego u/zycia:

   (autoload 'ogonek-jak \"ogonek\")
   (autoload 'ogonek-recode-region \"ogonek\")
   (autoload 'ogonek-prefixify-region \"ogonek\")
   (autoload 'ogonek-deprefixify-region \"ogonek\")

 Cz/esto wyst/epuj/ace kombinacje wywo/la/n funkcji mo/zna dla wygody
 skr/oci/c i przypisa/c klawiszom. Oto praktyczne przyk/lady:

   (defun deprefixify-iso8859-2-region (start end)
     (interactive \"*r\")
     (ogonek-deprefixify-region start end ?/ \"iso8859-2\"))
   (global-set-key \"\\C-cd\" 'deprefixify-iso8859-2-region) ; ctrl-c d

   (defun mazovia-to-iso8859-2 (start end)
     (interactive \"*r\")
     (ogonek-recode-region start end \"mazovia\" \"iso8859-2\"))
   (global-set-key \"\\C-cr\" 'mazovia-to-iso8859-2) ; ctrl-c r

   (defun prefixify-iso8859-2-region (start end)
     (interactive \"*r\")
     (ogonek-prefixify-region start end \"iso8859-2\" ?/))
   (global-set-key \"\\C-cp\" 'prefixify-iso8859-2-region) ; ctrl-c p

 Ka/zd/a operacj/e przekodowania mo/zna w ca/lo/sci odwo/la/c
 przez wykonanie polecenia `undo'.")

(defun ogonek-jak ()
  "Display `ogonek-informacja' in an auxiliary *ogonek-jak* buffer."
  (interactive)
  (set-buffer  (get-buffer-create " *ogonek-jak*"))
  (insert ogonek-informacja)
  (switch-to-buffer " *ogonek-jak*")
  (goto-char (point-min)))

;; ------ A Little Info in English --------

(defconst ogonek-information
  "  THE INTERACTIVE FUNCTIONS PROVIDED BY THE LIBRARY `ogonek'.

If you read this text then you are either looking at the library's
source text or you have called the `ogonek-how' command. In the
latter case you may remove this text using `M-x kill-buffer'.

The library provides functions for changing the encoding of Polish
diacritic characters, the ones with an `ogonek' below or above them.
The functions come in the following groups.

 1. `ogonek-recode-region' and `ogonek-recode-buffer' to change
    between one-character encodings, such as `iso-8859-2', `mazovia',
    plain `ascii' or `TeX'. As the names suggest you may recode
    either the entire current buffer or just a marked region
    in it. You may use the functions interactively as commands.
    Once you call a command you will be asked about the code
    currently used in your text and the target encoding, the one
    you want to get. The following example shows a non-interactive
    use of the functions in a program. This also illustrates what
    type of parameters the functions expect to be called with:

      (ogonek-recode-region
        (region-beginning) (region-end) from-code-name to-code-name)
      (ogonek-recode-buffer from-code-name to-code-name)

 2. `ogonek-prefixify-region' and `ogonek-prefixify-buffer' for
    introducing prefix notation:

      (ogonek-prefixify-region
        (region-beginning) (region-end) from-code-name prefix-char)
      (ogonek-prefixify-buffer from-code-name prefix-char)

 3. `ogonek-deprefixify-region' and `ogonek-deprefixify-buffer' for
    removing prefix notation:

      (ogonek-deprefixify-region
        (region-beginning) (region-end) prefix-char to-code-name)
      (ogonek-prefixify-buffer prefix-char to-code-name)

 The TAB character used in interactive mode makes `emacs'
 display the list of encodings recognized by the library. The list
 is stored in the constant `ogonek-name-encoding-alist'.

 The `ogonek' functions refer to five variables in which the suggested
 answers to dialogue questions are stored. The variables and their
 default values are:

   ogonek-from-encoding           iso8859-2
   ogonek-to-encoding             ascii
   ogonek-prefix-char             /
   ogonek-prefix-from-encoding    iso8859-2
   ogonek-prefix-to-encoding      iso8859-2

 The above default values can be changed by placing appropriate settings
 in the '~/.emacs' file:

   (setq ogonek-prefix-char ?/)
   (setq ogonek-prefix-to-encoding \"iso8859-2\")

 Instead of loading the whole library `ogonek' it may be better to
 autoload the needed functions, for example by placing in `~/.emacs':

   (autoload 'ogonek-how \"ogonek\")
   (autoload 'ogonek-recode-region \"ogonek\")
   (autoload 'ogonek-prefixify-region \"ogonek\")
   (autoload 'ogonek-deprefixify-region \"ogonek\")

 The most frequent function calls can be abbreviated and assigned to
 keyboard keys. Here are a few practical examples:

   (defun deprefixify-iso8859-2-region (start end)
     (interactive \"*r\")
     (ogonek-deprefixify-region start end ?/ \"iso8859-2\"))
   (global-set-key \"\\C-cd\" 'deprefixify-iso8859-2-region) ; ctrl-c d

   (defun mazovia-to-iso8859-2 (start end)
     (interactive \"*r\")
     (ogonek-recode-region start end \"mazovia\" \"iso8859-2\"))
   (global-set-key \"\\C-cr\" 'mazovia-to-iso8859-2) ; ctrl-c r

   (defun prefixify-iso8859-2-region (start end)
     (interactive \"*r\")
     (ogonek-prefixify-region start end \"iso8859-2\" ?/))
   (global-set-key \"\\C-cp\" 'prefixify-iso8859-2-region) ; ctrl-c p

 Each recoding operation can be called off using the `undo' command.")

(defun ogonek-how ()
  "Display `ogonek-information' in an auxiliary *recode-how* buffer."
  (interactive "*")
  (set-buffer  (get-buffer-create " *ogonek-how*"))
  (insert ogonek-information)
  (switch-to-buffer " *ogonek-how*")
  (goto-char (point-min)))

;; ---- Variables keeping the suggested answers to dialogue questions -----
(defvar ogonek-encoding-choices
  (cons 'choice
	(mapcar (lambda (x) (list 'const (car x)))
		ogonek-name-encoding-alist))
  "List of ogonek encodings.  Used only for customization.")
(defcustom ogonek-from-encoding "iso8859-2"
  "*Encoding in the source file of recoding."
  :type ogonek-encoding-choices
  :group 'ogonek)
(defcustom ogonek-to-encoding "ascii"
  "*Encoding in the target file of recoding."
  :type ogonek-encoding-choices
  :group 'ogonek)
(defcustom ogonek-prefix-char ?/
  "*Prefix character for prefix encodings."
  :type 'character
  :group 'ogonek)
(defcustom ogonek-prefix-from-encoding "iso8859-2"
  "*Encoding in the source file subject to prefixifation."
  :type ogonek-encoding-choices
  :group 'ogonek)
(defcustom ogonek-prefix-to-encoding "iso8859-2"
  "*Encoding in the target file subject to deprefixifation."
  :type ogonek-encoding-choices
  :group 'ogonek)

;; ---- Auxiliary functions for reading parameters in interactive mode ----

(defun ogonek-read-encoding (prompt default-name-var)
  "Read encoding name with completion based on `ogonek-name-encoding-alist'.
Store the name in the parameter-variable DEFAULT-NAME-VAR.
PROMPT is a string to be shown when the user is asked for a name."
 (let ((encoding
        (completing-read
         (format "%s (default %s): " prompt (eval default-name-var))
         ogonek-name-encoding-alist nil t)))
  ;; change the default name to the one just read
  (set default-name-var
    (if (string= encoding "") (eval default-name-var) encoding))
  ;; return the new default as the name you read
  (eval default-name-var)))

(defun ogonek-read-prefix (prompt default-prefix-var)
  "Read a prefix character for prefix notation.
The result is stored in the variable DEFAULT-PREFIX-VAR.
PROMPT is a string to be shown when the user is asked for a new prefix."
  (let ((prefix-string
         (read-string
          (format "%s (default %s): " prompt
                  (char-to-string (eval default-prefix-var))))))
    (if (> (length prefix-string) 1)
        (error "! Only one character expected")
      ;; set the default prefix character to the one just read
      (set default-prefix-var
           (if (string= prefix-string "")
             (eval default-prefix-var)
           (string-to-char prefix-string)))
      ;; the new default prefix is the function's result:
      (eval default-prefix-var))))

(defun ogonek-lookup-encoding (encoding)
  "Pick up an association for ENCODING in `ogonek-name-encoding-alist'.
Before returning a result test whether the string ENCODING is in
the list `ogonek-name-encoding-alist'"
  (let ((code-list (assoc encoding ogonek-name-encoding-alist)))
    (if (null code-list)
      (error "! Name `%s' not known in `ogonek-name-encoding-alist'"
               encoding)
      (cdr code-list))))

;; ----  An auxiliary function for zipping two lists of equal length ----

(defun ogonek-zip-lists (xs ys)
  "Build a list of pairs from lists XS and YS of the same length."
  (let ((pairs nil))
    (while xs
      (setq pairs (cons (cons (car xs) (car ys)) pairs))
      (setq xs (cdr xs))
      (setq ys (cdr ys)))
    ;; `pairs' are the function's result
    pairs))

;; ---- An auxiliary function building a one-to-one recoding table -----

(defun ogonek-build-table (recoding-pairs)
  "Build a table required by Emacs's `translate-region' function.
RECODING-PAIRS is a list of character pairs for which recoding
is not an identity.
By using the built-in `translate-region' function
we gain better performance compared to converting characters
by a hand-written routine as it is done for prefix encodings."
  (let ((table (make-string 256 0))
        (i 0))
    (while (< i 256)
      (aset table i i)
      (setq i (1+ i)))
    ;; make changes in `table' according to `recoding-pairs'
    (while recoding-pairs
      (aset table (car (car recoding-pairs)) (cdr (car recoding-pairs)))
      (setq recoding-pairs (cdr recoding-pairs)))
    ;; return the table just built
    table))

;; ---- Commands for one-to-one recoding -------------------------------

(defun ogonek-recode-region (start end from-encoding to-encoding)
  "Recode text in a marked region in one-to-one manner.
When called interactively ask the user for the names of the FROM-
and TO- encodings."
  (interactive (progn (barf-if-buffer-read-only)
                (list
                (region-beginning)
                (region-end)
                (ogonek-read-encoding "From code" 'ogonek-from-encoding)
                (ogonek-read-encoding "To code" 'ogonek-to-encoding))))
  (save-excursion
    (translate-region
     start end
     (ogonek-build-table
      (ogonek-zip-lists
       (ogonek-lookup-encoding from-encoding)
       (ogonek-lookup-encoding to-encoding))))))

(defun ogonek-recode-buffer (from-encoding to-encoding)
  "Call `ogonek-recode-region' on the entire buffer.
When called interactively ask the user for the names of the FROM-
and TO- encodings."
  (interactive (progn (barf-if-buffer-read-only)
                (list
                (ogonek-read-encoding "From code" 'ogonek-from-encoding)
                (ogonek-read-encoding "To code" 'ogonek-to-encoding))))
  (ogonek-recode-region
   (point-min) (point-max) from-encoding to-encoding))

;; ---- Recoding with prefix notation -------------------------------

(defconst ogonek-prefix-code '(?A  ?C  ?E  ?L  ?N  ?O  ?S  ?X  ?Z
                               ?a  ?c  ?e  ?l  ?n  ?o  ?s  ?x  ?z))

(defun ogonek-prefixify-region (start end from-encoding prefix-char)
  "In a region, replace FROM-encoded Polish characters with PREFIX pairs.
A PREFIX pair generated consists of PREFIX-CHAR and the respective
character listed in the `ogonek-prefix-code' constant.
PREFIX-CHAR itself gets doubled."
  (interactive (progn (barf-if-buffer-read-only)
    (list
    (region-beginning)
    (region-end)
    (ogonek-read-encoding "From code" 'ogonek-prefix-from-encoding)
    (ogonek-read-prefix "Prefix character" 'ogonek-prefix-char))))
  (let*
      ((from-code (ogonek-lookup-encoding from-encoding))
       (to-code ogonek-prefix-code)
       (recoding-pairs  ; `ogonek-prefix-char' added for doubling
        (ogonek-zip-lists
         (cons prefix-char from-code)
         (cons prefix-char to-code))))
    (save-excursion
      (goto-char start)
      (while (< (point) end)
        (let ((pair (assoc (following-char) recoding-pairs)))
          (if (null pair)
              ;; not a Polish character -- skip it
              (forward-char 1)
            ;; Polish character -- insert a prefix pair instead
            (delete-char 1)
            (insert ogonek-prefix-char)
            (insert (cdr pair))
            ;; the region is now one character longer
            (setq end (1+ end))))))))

(defun ogonek-prefixify-buffer (from-encoding prefix-char)
  "Call `ogonek-prefixify-region' on the entire buffer."
  (interactive (progn (barf-if-buffer-read-only)
    (list
     (ogonek-read-encoding "From code" 'ogonek-prefix-from-encoding)
     (ogonek-read-prefix "Prefix character" 'ogonek-prefix-char))))
  (ogonek-prefixify-region
   (point-min) (point-max) from-encoding prefix-char))

(defun ogonek-deprefixify-region (start end prefix-char to-encoding)
  "In a region, replace PREFIX pairs with their corresponding TO-encodings.
PREFIX-CHAR followed by a Polish character from the `ogonek-prefix-code'
list is replaced with the corresponding TO-encoded character. A doubled
PREFIX-CHAR gets replaced with a single one. A combination of PREFIX-CHAR
followed by a non-Polish character, that is one not listed in the
`ogonek-prefix-code' constant, is left unchanged."
  (interactive (progn (barf-if-buffer-read-only)
                (list (region-beginning)
                      (region-end)
                      (ogonek-read-prefix
                        "Prefix character" 'ogonek-prefix-char)
                      (ogonek-read-encoding
                       "To code" 'ogonek-prefix-to-encoding))))
  (let*
      ((from-code ogonek-prefix-code)
       (to-code (ogonek-lookup-encoding to-encoding))
       (recoding-pairs
        (ogonek-zip-lists
          (cons prefix-char from-code)
          (cons prefix-char to-code))))
    (save-excursion
      (goto-char start)
      (while (< (point) end)
        (forward-char 1)
       (if (or (not (= (preceding-char) prefix-char)) (= (point) end))
           ;; non-prefix character or the end-of-region -- do nothing
           ()
         ;; now, we can check the next character
         (let ((pair (assoc (following-char) recoding-pairs)))
           (if (null pair)
               ;; `following-char' is not a Polish character nor it is
               ;;  `prefix-char' since the one is among `recoding-pairs'
               (forward-char 1)
           ;; else prefix followed by a Polish character has been found
           ;; replace it by the corresponding Polish character
           (backward-char 1)
           (delete-char 2)
           (insert (cdr pair))
           ;; the region got shorter by one character
           (setq end (1- end)))))))))

(defun ogonek-deprefixify-buffer (prefix-char to-encoding)
  "Call `ogonek-deprefixify-region' on the entire buffer."
  (interactive (progn (barf-if-buffer-read-only)
    (list
     (ogonek-read-prefix "Prefix character" 'ogonek-prefix-char)
     (ogonek-read-encoding "To code" 'ogonek-prefix-to-encoding))))
  (ogonek-deprefixify-region
   (point-min) (point-max) prefix-char to-encoding))

(provide 'ogonek)

;;; arch-tag: 672d7744-28ac-412b-965e-06a27e50d1d7
;;; ogonek.el ends here