299 lines
9.1 KiB
EmacsLisp
299 lines
9.1 KiB
EmacsLisp
;;; viet-util.el --- utilities for Vietnamese -*- lexical-binding: t; -*-
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;; Copyright (C) 1998, 2001-2024 Free Software Foundation, Inc.
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;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
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;; 2005, 2006, 2007, 2008, 2009, 2010, 2011
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;; National Institute of Advanced Industrial Science and Technology (AIST)
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;; Registration Number H14PRO021
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;; Copyright (C) 2003
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;; National Institute of Advanced Industrial Science and Technology (AIST)
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;; Registration Number H13PRO009
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;; Keywords: mule, multilingual, Vietnamese
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Vietnamese uses ASCII characters and additional 134 unique
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;; characters (these are Latin alphabets with various diacritical and
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;; tone marks). As far as I know, Vietnamese now has 5 different ways
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;; for representing these characters: VISCII, TCVN-5712, VPS, VIQR,
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;; and Unicode. VISCII, TCVN-5712 and VPS are simple 1-byte code
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;; which assigns 134 unique characters in control-code area
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;; (0x00..0x1F) and right half area (0x80..0xFF). VIQR is a mnemonic
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;; encoding specification representing diacritical marks by following
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;; ASCII characters.
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;;; Code:
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(defvar viet-viscii-nonascii-translation-table)
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;;;###autoload
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(defun viet-encode-viscii-char (char)
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"Return VISCII character code of CHAR if appropriate."
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(encode-char char 'viscii))
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;; VIQR is a mnemonic encoding specification for Vietnamese.
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;; It represents diacritical marks by ASCII characters as follows:
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;; ------------+----------+--------
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;; mark | mnemonic | example
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;; ------------+----------+---------
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;; breve | ( | a( -> ă
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;; circumflex | ^ | a^ -> â
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;; horn | + | o+ -> ơ
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;; ------------+----------+---------
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;; acute | ' | a' -> á
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;; grave | ` | a` -> à
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;; hook above | ? | a? -> ả
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;; tilde | ~ | a~ -> ã
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;; dot below | . | a. -> ạ
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;; ------------+----------+---------
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;; d bar | dd | dd -> đ
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;; ------------+----------+---------
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(defvar viet-viqr-alist
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'(;; lowercase
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(?ắ . "a('") ; 161
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(?ằ . "a(`") ; 162
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(?ặ . "a(.") ; 163
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(?ấ . "a^'") ; 164
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(?ầ . "a^`") ; 165
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(?ẩ . "a^?") ; 166
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(?ậ . "a^.") ; 167
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(?ẽ . "e~") ; 168
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(?ẹ . "e.") ; 169
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(?ế . "e^'") ; 170
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(?ề . "e^`") ; 171
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(?ể . "e^?") ; 172
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(?ễ . "e^~") ; 173
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(?ệ . "e^.") ; 174
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(?ố . "o^'") ; 175
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(?ồ . "o^`") ; 176
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(?ổ . "o^?") ; 177
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(?ỗ . "o^~") ; 178
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(?ộ . "o^.") ; 181
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(?ờ . "o+`") ; 182
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(?ở . "o+?") ; 183
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(?ị . "i.") ; 184
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(?ơ . "o+") ; 189
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(?ớ . "o+'") ; 190
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(?ẳ . "a(?") ; 198
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(?ẵ . "a(~") ; 199
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(?ỳ . "y`") ; 207
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(?ứ . "u+'") ; 209
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(?ạ . "a.") ; 213
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(?ỷ . "y?") ; 214
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(?ừ . "u+`") ; 215
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(?ử . "u+?") ; 216
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(?ỹ . "y~") ; 219
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(?ỵ . "y.") ; 220
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(?ỡ . "o+~") ; 222
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(?ư . "u+") ; 223
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(?à . "a`") ; 224
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(?á . "a'") ; 225
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(?â . "a^") ; 226
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(?ã . "a~") ; 227
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(?ả . "a?") ; 228
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(?ă . "a(") ; 229
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(?ữ . "u+~") ; 230
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(?ẫ . "a^~") ; 231
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(?è . "e`") ; 232
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(?é . "e'") ; 233
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(?ê . "e^") ; 234
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(?ẻ . "e?") ; 235
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(?ì . "i`") ; 236
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(?í . "i'") ; 237
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(?ĩ . "i~") ; 238
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(?ỉ . "i?") ; 239
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(?đ . "dd") ; 240
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(?ự . "u+.") ; 241
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(?ò . "o`") ; 242
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(?ó . "o'") ; 243
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(?ô . "o^") ; 244
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(?õ . "o~") ; 245
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(?ỏ . "o?") ; 246
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(?ọ . "o.") ; 247
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(?ụ . "u.") ; 248
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(?ù . "u`") ; 249
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(?ú . "u'") ; 250
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(?ũ . "u~") ; 251
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(?ủ . "u?") ; 252
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(?ý . "y'") ; 253
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(?ợ . "o+.") ; 254
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;; upper case
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(?Ắ . "A('") ; 161
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(?Ằ . "A(`") ; 162
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(?Ặ . "A(.") ; 163
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(?Ấ . "A^'") ; 164
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(?Ầ . "A^`") ; 165
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(?Ẩ . "A^?") ; 166
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(?Ậ . "A^.") ; 167
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(?Ẽ . "E~") ; 168
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(?Ẹ . "E.") ; 169
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(?Ế . "E^'") ; 170
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(?Ề . "E^`") ; 171
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(?Ể . "E^?") ; 172
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(?Ễ . "E^~") ; 173
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(?Ệ . "E^.") ; 174
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(?Ố . "O^'") ; 175
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(?Ồ . "O^`") ; 176
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(?Ổ . "O^?") ; 177
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(?Ỗ . "O^~") ; 178
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(?Ộ . "O^.") ; 181
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(?Ờ . "O+`") ; 182
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(?Ở . "O+?") ; 183
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(?Ị . "I.") ; 184
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(?Ơ . "O+") ; 189
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(?Ớ . "O+'") ; 190
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(?Ẳ . "A(?") ; 198
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(?Ẵ . "A(~") ; 199
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(?Ỳ . "Y`") ; 207
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(?Ứ . "U+'") ; 209
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(?Ạ . "A.") ; 213
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(?Ỷ . "Y?") ; 214
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(?Ừ . "U+`") ; 215
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(?Ử . "U+?") ; 216
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(?Ỹ . "Y~") ; 219
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(?Ỵ . "Y.") ; 220
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(?Ỡ . "O+~") ; 222
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(?Ư . "U+") ; 223
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(?À . "A`") ; 224
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(?Á . "A'") ; 225
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(? . "A^") ; 226
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(?Ã . "A~") ; 227
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(?Ả . "A?") ; 228
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(?Ă . "A(") ; 229
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(?Ữ . "U+~") ; 230
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(?Ẫ . "A^~") ; 231
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(?È . "E`") ; 232
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(?É . "E'") ; 233
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(?Ê . "E^") ; 234
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(?Ẻ . "E?") ; 235
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(?Ì . "I`") ; 236
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(?Í . "I'") ; 237
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(?Ĩ . "I~") ; 238
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(?Ỉ . "I?") ; 239
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(?Đ . "DD") ; 240
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(?Đ . "dD") ; 240
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(?Đ . "Dd") ; 240
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(?Ự . "U+.") ; 241
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(?Ò . "O`") ; 242
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(?Ó . "O'") ; 243
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(?Ô . "O^") ; 244
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(?Õ . "O~") ; 245
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(?Ỏ . "O?") ; 246
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(?Ọ . "O.") ; 247
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(?Ụ . "U.") ; 248
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(?Ù . "U`") ; 249
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(?Ú . "U'") ; 250
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(?Ũ . "U~") ; 251
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(?Ủ . "U?") ; 252
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(?Ý . "Y'") ; 253
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(?Ợ . "O+.") ; 254
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;; escape from composition
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(?\( . "\\(") ; breve (left parenthesis)
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(?^ . "\\^") ; circumflex (caret)
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(?+ . "\\+") ; horn (plus sign)
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(?' . "\\'") ; acute (apostrophe)
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(?` . "\\`") ; grave (backquote)
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(?? . "\\?") ; hook above (question mark)
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(?~ . "\\~") ; tilde (tilde)
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(?. . "\\.") ; dot below (period)
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(?d . "\\d") ; d-bar (d)
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(?\\ . "\\\\") ; literal backslash
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)
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"Alist of Vietnamese characters vs corresponding `VIQR' string.")
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;; Regular expression matching single Vietnamese character represented
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;; by VIQR.
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(defconst viqr-regexp
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"[aeiouyAEIOUY]\\([(^+]?['`?~.]\\|[(^+]\\)\\|[Dd][Dd]")
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;;;###autoload
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(defun viet-decode-viqr-region (from to)
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"Convert `VIQR' mnemonics of the current region to Vietnamese characters.
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When called from a program, expects two arguments,
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positions (integers or markers) specifying the stretch of the region."
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(interactive "r")
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(save-restriction
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(narrow-to-region from to)
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(goto-char (point-min))
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(while (re-search-forward viqr-regexp nil t)
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(let* ((viqr (buffer-substring (match-beginning 0) (match-end 0)))
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(ch (car (rassoc viqr viet-viqr-alist))))
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(if ch
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(progn
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(delete-region (match-beginning 0) (match-end 0))
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(insert ch)))))))
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;;;###autoload
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(defun viet-decode-viqr-buffer ()
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"Convert `VIQR' mnemonics of the current buffer to Vietnamese characters."
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(interactive)
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(viet-decode-viqr-region (point-min) (point-max)))
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;;;###autoload
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(defun viet-encode-viqr-region (from to)
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"Convert Vietnamese characters of the current region to `VIQR' mnemonics.
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When called from a program, expects two arguments,
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positions (integers or markers) specifying the stretch of the region."
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(interactive "r")
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(save-restriction
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(narrow-to-region from to)
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(goto-char (point-min))
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(while (re-search-forward "\\cv" nil t)
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(let* ((ch (preceding-char))
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(viqr (cdr (assq ch viet-viqr-alist))))
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(if viqr
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(progn
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(delete-char -1)
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(insert viqr)))))))
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;;;###autoload
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(defun viet-encode-viqr-buffer ()
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"Convert Vietnamese characters of the current buffer to `VIQR' mnemonics."
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(interactive)
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(viet-encode-viqr-region (point-min) (point-max)))
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;;;###autoload
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(defun viqr-post-read-conversion (len)
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(save-excursion
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(save-restriction
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(narrow-to-region (point) (+ (point) len))
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(let ((buffer-modified-p (buffer-modified-p)))
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(viet-decode-viqr-region (point-min) (point-max))
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(set-buffer-modified-p buffer-modified-p)
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(- (point-max) (point-min))))))
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;;;###autoload
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(defun viqr-pre-write-conversion (from to)
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(let ((old-buf (current-buffer)))
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(set-buffer (generate-new-buffer " *temp*"))
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(if (stringp from)
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(insert from)
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(insert-buffer-substring old-buf from to))
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(viet-encode-viqr-region (point-min) (point-max))
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;; Should return nil as annotations.
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nil))
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;;;
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(provide 'viet-util)
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;;; viet-util.el ends here
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