viet-util.el 9.52 KB
Newer Older
1
;;; viet-util.el ---  utilities for Vietnamese
Karl Heuer's avatar
Karl Heuer committed
2 3

;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
Richard M. Stallman's avatar
Richard M. Stallman committed
4
;; Licensed to the Free Software Foundation.
Karl Heuer's avatar
Karl Heuer committed
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

;; Keywords: mule, multilingual, Vietnamese

;; 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
Karl Heuer's avatar
Karl Heuer committed
21 22 23
;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
Karl Heuer's avatar
Karl Heuer committed
24 25 26 27 28 29 30 31 32 33 34 35 36 37

;;; Commentary:

;; Vietnamese uses ASCII characters and additional 134 unique
;; characters (these are Latin alphabets with various diacritical and
;; tone marks).  As far as I know, Vietnamese now has 4 different ways
;; for representing these characters: VISCII, VSCII, VIQR, and
;; Unicode.  VISCII and VSCII are simple 1-byte code which assigns 134
;; unique characters in control-code area (0x00..0x1F) and right half
;; area (0x80..0xFF).  VIQR is a menmonic encoding specification
;; representing diacritical marks by following ASCII characters.

;;; Code:

38
;;;###autoload
39
(defun setup-vietnamese-environment ()
40
  "Setup multilingual environment (MULE) for Vietnamese VISCII users."
41
  (interactive)
42 43
  (setup-8-bit-environment "Vietnamese" nil 'vietnamese-viscii
			   "vietnamese-viqr"))
44

Karl Heuer's avatar
Karl Heuer committed
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
;; VIQR is a menmonic encoding specification for Vietnamese.
;; It represents diacritical marks by ASCII characters as follows:
;; ------------+----------+--------
;;     mark    | mnemonic | example
;; ------------+----------+---------
;;    breve    |    (     | a( -> ,1e(B
;;  circumflex |    ^     | a^ -> ,1b(B
;;    horn     |    +     | o+ -> ,1=(B
;; ------------+----------+---------
;;    acute    |    '     | a' -> ,1a(B
;;    grave    |    `     | a` -> ,1`(B
;;  hook above |    ?     | a? -> ,1d(B
;;    tilde    |    ~     | a~ -> ,1c(B
;;   dot below |    .     | a. -> ,1U(B
;; ------------+----------+---------
;;    d bar    |   dd     | dd -> ,1p(B
;; ------------+----------+---------

(defvar viet-viqr-alist
  '(;; lowercase
    (?,1!(B . "a('")			; 161
    (?,1"(B . "a(`")			; 162
    (?,1#(B . "a(.")			; 163
    (?,1$(B . "a^'")			; 164
    (?,1%(B . "a^`")			; 165
    (?,1&(B . "a^?")			; 166
    (?,1'(B . "a^.")			; 167
    (?,1((B . "e~")				; 168
    (?,1)(B . "e.")				; 169
    (?,1*(B . "e^'")			; 170
    (?,1+(B . "e^`")			; 171
    (?,1,(B . "e^?")			; 172
    (?,1-(B . "e^~")			; 173
    (?,1.(B . "e^.")			; 174
    (?,1/(B . "o^'")			; 175
    (?,10(B . "o^`")			; 176
    (?,11(B . "o^?")			; 177
    (?,12(B . "o^~")			; 178
    (?,15(B . "o^.")			; 181
    (?,16(B . "o+`")			; 182
    (?,17(B . "o+?")			; 183
    (?,18(B . "i.")				; 184
    (?,1=(B . "o+")				; 189
    (?,1>(B . "o+'")			; 190
    (?,1F(B . "a(?")			; 198
    (?,1G(B . "a(~")			; 199
    (?,1O(B . "y`")				; 207
    (?,1Q(B . "u+'")			; 209
    (?,1U(B . "a.")				; 213
    (?,1V(B . "y?")				; 214
    (?,1W(B . "u+`")			; 215
    (?,1X(B . "u+?")			; 216
    (?,1[(B . "y~")				; 219
    (?,1\(B . "y.")				; 220
    (?,1^(B . "o+~")			; 222
    (?,1_(B . "u+")				; 223
    (?,1`(B . "a`")				; 224
    (?,1a(B . "a'")				; 225
    (?,1b(B . "a^")				; 226
    (?,1c(B . "a~")				; 227
    (?,1d(B . "a?")				; 228
    (?,1e(B . "a(")				; 229
    (?,1f(B . "u+~")			; 230
    (?,1g(B . "a^~")			; 231
    (?,1h(B . "e`")				; 232
    (?,1i(B . "e'")				; 233
    (?,1j(B . "e^")				; 234
    (?,1k(B . "e?")				; 235
    (?,1l(B . "i`")				; 236
    (?,1m(B . "i'")				; 237
    (?,1n(B . "i~")				; 238
    (?,1o(B . "i?")				; 239
    (?,1p(B . "dd")				; 240
    (?,1q(B . "u+.")			; 241
    (?,1r(B . "o`")				; 242
    (?,1s(B . "o'")				; 243
    (?,1t(B . "o^")				; 244
    (?,1u(B . "o~")				; 245
    (?,1v(B . "o?")				; 246
    (?,1w(B . "o.")				; 247
    (?,1x(B . "u.")				; 248
    (?,1y(B . "u`")				; 249
    (?,1z(B . "u'")				; 250
    (?,1{(B . "u~")				; 251
    (?,1|(B . "u?")				; 252
    (?,1}(B . "y'")				; 253
    (?,1~(B . "o+.")			; 254

    ;; upper case
    (?,2!(B . "A('")			; 161
    (?,2"(B . "A(`")			; 162
    (?,2#(B . "A(.")			; 163
    (?,2$(B . "A^'")			; 164
    (?,2%(B . "A^`")			; 165
    (?,2&(B . "A^?")			; 166
    (?,2'(B . "A^.")			; 167
    (?,2((B . "E~")				; 168
    (?,2)(B . "E.")				; 169
    (?,2*(B . "E^'")			; 170
    (?,2+(B . "E^`")			; 171
    (?,2,(B . "E^?")			; 172
    (?,2-(B . "E^~")			; 173
    (?,2.(B . "E^.")			; 174
    (?,2/(B . "O^'")			; 175
    (?,20(B . "O^`")			; 176
    (?,21(B . "O^?")			; 177
    (?,22(B . "O^~")			; 178
    (?,25(B . "O^.")			; 181
    (?,26(B . "O+`")			; 182
    (?,27(B . "O+?")			; 183
    (?,28(B . "I.")				; 184
    (?,2=(B . "O+")				; 189
    (?,2>(B . "O+'")			; 190
    (?,2F(B . "A(?")			; 198
    (?,2G(B . "A(~")			; 199
    (?,2O(B . "Y`")				; 207
    (?,2Q(B . "U+'")			; 209
    (?,2U(B . "A.")				; 213
    (?,2V(B . "Y?")				; 214
    (?,2W(B . "U+`")			; 215
    (?,2X(B . "U+?")			; 216
    (?,2[(B . "Y~")				; 219
    (?,2\(B . "Y.")				; 220
    (?,2^(B . "O+~")			; 222
    (?,2_(B . "U+")				; 223
    (?,2`(B . "A`")				; 224
    (?,2a(B . "A'")				; 225
    (?,2b(B . "A^")				; 226
    (?,2c(B . "A~")				; 227
    (?,2d(B . "A?")				; 228
    (?,2e(B . "A(")				; 229
    (?,2f(B . "U+~")			; 230
    (?,2g(B . "A^~")			; 231
    (?,2h(B . "E`")				; 232
    (?,2i(B . "E'")				; 233
    (?,2j(B . "E^")				; 234
    (?,2k(B . "E?")				; 235
    (?,2l(B . "I`")				; 236
    (?,2m(B . "I'")				; 237
    (?,2n(B . "I~")				; 238
    (?,2o(B . "I?")				; 239
    (?,2p(B . "DD")				; 240
    (?,2p(B . "dD")				; 240
    (?,2p(B . "Dd")				; 240
    (?,2q(B . "U+.")			; 241
    (?,2r(B . "O`")				; 242
    (?,2s(B . "O'")				; 243
    (?,2t(B . "O^")				; 244
    (?,2u(B . "O~")				; 245
    (?,2v(B . "O?")				; 246
    (?,2w(B . "O.")				; 247
    (?,2x(B . "U.")				; 248
    (?,2y(B . "U`")				; 249
    (?,2z(B . "U'")				; 250
    (?,2{(B . "U~")				; 251
    (?,2|(B . "U?")				; 252
    (?,2}(B . "Y'")				; 253
    (?,2~(B . "O+.")			; 254

    ;; escape from composition
    (?\( . "\\(")			; breve (left parenthesis)
    (?^ . "\\^")			; circumflex (caret)
    (?+ . "\\+")			; horn (plus sign)
    (?' . "\\'")			; acute (apostrophe)
    (?` . "\\`")			; grave (backquote)
    (?? . "\\?")			; hook above (question mark)
    (?~ . "\\~")			; tilde (tilde)
    (?. . "\\.")			; dot below (period)
    (?d . "\\d")			; d-bar (d)
    (?\\ . "\\\\")			; literal backslash
    )
  "Alist of Vietnamese characters vs corresponding `VIQR' string.")

;; Regular expression matching single Vietnamese character represented
;; by VIQR.
(defconst viqr-regexp
  "[aeiouyAEIOUY]\\([(^+]?['`?~.]\\|[(^+]\\)\\|[Dd][Dd]")

;;;###autoload
(defun viet-decode-viqr-region (from to)
  "Convert `VIQR' mnemonics of the current region to Vietnamese characaters.
When called from a program, expects two arguments,
positions (integers or markers) specifying the stretch of the region."
  (interactive "r")
  (save-restriction
    (narrow-to-region from to)
    (goto-char (point-min))
    (while (re-search-forward viqr-regexp nil t)
      (let* ((viqr (buffer-substring (match-beginning 0) (match-end 0)))
234
	     (ch (car (rassoc viqr viet-viqr-alist))))
Karl Heuer's avatar
Karl Heuer committed
235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256
	(if ch
	    (progn
	      (delete-region (match-beginning 0) (match-end 0))
	      (insert ch)))))))

;;;###autoload
(defun viet-decode-viqr-buffer ()
  "Convert `VIQR' mnemonics of the current buffer to Vietnamese characaters."
  (interactive)
  (viet-decode-viqr-region (point-min) (point-max)))

;;;###autoload
(defun viet-encode-viqr-region (from to)
  "Convert Vietnamese characaters of the current region to `VIQR' mnemonics.
When called from a program, expects two arguments,
positions (integers or markers) specifying the stretch of the region."
  (interactive "r")
  (save-restriction
    (narrow-to-region from to)
    (goto-char (point-min))
    (while (re-search-forward "\\cv" nil t)
      (let* ((ch (preceding-char))
257
	     (viqr (cdr (assq ch viet-viqr-alist))))
Karl Heuer's avatar
Karl Heuer committed
258 259 260 261 262 263 264 265 266 267 268
	(if viqr
	    (progn
	      (delete-char -1)
	      (insert viqr)))))))

;;;###autoload
(defun viet-encode-viqr-buffer ()
  "Convert Vietnamese characaters of the current buffer to `VIQR' mnemonics."
  (interactive)
  (viet-encode-viqr-region (point-min) (point-max)))

269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284
;;;###autoload
(defun viqr-post-read-conversion (len)
  (save-excursion
    (save-restriction
      (narrow-to-region (point) (+ (point) len))
      (let ((buffer-modified-p (buffer-modified-p)))
	(viet-decode-viqr-region (point-min) (point-max))
	(set-buffer-modified-p buffer-modified-p)
	(- (point-max) (point-min))))))

;;;###autoload
(defun viqr-pre-write-conversion (from to)
  (let ((old-buf (current-buffer))
	(work-buf (get-buffer-create " *viet-work*")))
    (set-buffer work-buf)
    (erase-buffer)
285 286 287 288 289 290
    (if (stringp from)
	(insert from)
      (insert-buffer-substring old-buf from to))
    (viet-encode-viqr-region (point-min) (point-max))
    ;; Should return nil as annotations.
    nil))
291

Karl Heuer's avatar
Karl Heuer committed
292
;;;
Kenichi Handa's avatar
Kenichi Handa committed
293
(provide 'viet-util)
Karl Heuer's avatar
Karl Heuer committed
294 295

;;; viet-util.el ends here