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;;; viet-util.el --- utilities for Vietnamese -*- coding: iso-2022-7bit; -*-
;; Copyright (C) 1998, 2001-2012 Free Software Foundation, Inc.
;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
;; 2005, 2006, 2007, 2008, 2009, 2010, 2011
;; National Institute of Advanced Industrial Science and Technology (AIST)
;; Registration Number H14PRO021
;; Copyright (C) 2003
;; National Institute of Advanced Industrial Science and Technology (AIST)
;; Registration Number H13PRO009
;; 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
;;; 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 5 different ways
;; for representing these characters: VISCII, TCVN-5712, VPS, VIQR,
;; and Unicode. VISCII, TCVN-5712 and VPS 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 mnemonic
;; encoding specification representing diacritical marks by following
;; ASCII characters.
;;; Code:
(defvar viet-viscii-nonascii-translation-table)
;;;###autoload
(defun viet-encode-viscii-char (char)
"Return VISCII character code of CHAR if appropriate."
(encode-char char 'viscii))
;; VIQR is a mnemonic 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 characters.
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)))
(ch (car (rassoc viqr viet-viqr-alist))))
(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 characters."
(interactive)
(viet-decode-viqr-region (point-min) (point-max)))
;;;###autoload
(defun viet-encode-viqr-region (from to)
"Convert Vietnamese characters 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))
(viqr (cdr (assq ch viet-viqr-alist))))
(if viqr
(progn
(delete-char -1)
(insert viqr)))))))
;;;###autoload
(defun viet-encode-viqr-buffer ()
"Convert Vietnamese characters of the current buffer to `VIQR' mnemonics."
(interactive)
(viet-encode-viqr-region (point-min) (point-max)))
;;;###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)))
(set-buffer (generate-new-buffer " *temp*"))
(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))
;;;
(provide 'viet-util)
;;; viet-util.el ends here
|
