lisp/language/indian.el

   1 ;;; indian.el --- Indian languages support -*- coding: utf-8; -*-
   2
   3 ;; Copyright (C) 1997, 1999, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
   4 ;;   Free Software Foundation, Inc.
   5 ;; Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
   6 ;;   National Institute of Advanced Industrial Science and Technology (AIST)
   7 ;;   Registration Number H14PRO021
   8
   9 ;; Maintainer:  Kenichi Handa <handa@m17n.org>
  10 ;;              KAWABATA, Taichi <kawabata@m17n.org>
  11 ;; Keywords:    multilingual, i18n, Indian
  12
  13 ;; This file is part of GNU Emacs.
  14
  15 ;; GNU Emacs is free software: you can redistribute it and/or modify
  16 ;; it under the terms of the GNU General Public License as published by
  17 ;; the Free Software Foundation, either version 3 of the License, or
  18 ;; (at your option) any later version.
  19
  20 ;; GNU Emacs is distributed in the hope that it will be useful,
  21 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  22 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23 ;; GNU General Public License for more details.
  24
  25 ;; You should have received a copy of the GNU General Public License
  26 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  27
  28 ;;; Commentary:
  29
  30 ;; This file contains definitions of Indian language environments, and
  31 ;; setups for displaying the scrtipts used there.
  32
  33 ;;; Code:
  34
  35 (define-coding-system 'in-is13194-devanagari
  36   "8-bit encoding for ASCII (MSB=0) and IS13194-Devanagari (MSB=1)."
  37   :coding-type 'iso-2022
  38   :mnemonic ?D
  39   :designation [ascii indian-is13194 nil nil]
  40   :charset-list '(ascii indian-is13194)
  41   :post-read-conversion 'in-is13194-post-read-conversion
  42   :pre-write-conversion 'in-is13194-pre-write-conversion)
  43
  44 (define-coding-system-alias 'devanagari 'in-is13194-devanagari)
  45
  46 (set-language-info-alist
  47  "Devanagari" '((charset unicode)
  48                 (coding-system utf-8)
  49                 (coding-priority utf-8)
  50                 (input-method . "dev-aiba")
  51                 (documentation . "\
  52 Such languages using Devanagari script as Hindi and Marathi
  53 are supported in this language environment."))
  54  '("Indian"))
  55
  56 (set-language-info-alist
  57  "Bengali" '((charset unicode)
  58              (coding-system utf-8)
  59              (coding-priority utf-8)
  60              (input-method . "bengali-itrans")
  61              (documentation . "\
  62 Such languages using Bengali script as Bengali and Assamese
  63 are supported in this language environment."))
  64  '("Indian"))
  65
  66 (set-language-info-alist
  67  "Punjabi" '((charset unicode)
  68               (coding-system utf-8)
  69               (coding-priority utf-8)
  70               (input-method . "punjabi-itrans")
  71               (documentation . "\
  72 North Indian language Punjabi is supported in this language environment."))
  73  '("Indian"))
  74
  75 (set-language-info-alist
  76  "Gujarati" '((charset unicode)
  77               (coding-system utf-8)
  78               (coding-priority utf-8)
  79               (input-method . "gujarati-itrans")
  80               (documentation . "\
  81 North Indian language Gujarati is supported in this language environment."))
  82  '("Indian"))
  83
  84 (set-language-info-alist
  85  "Oriya" '((charset unicode)
  86               (coding-system utf-8)
  87               (coding-priority utf-8)
  88               (input-method . "oriya-itrans")
  89               (documentation . "\
  90 Such languages using Oriya script as Oriya, Khonti, and Santali
  91 are supported in this language environment."))
  92  '("Indian"))
  93
  94 (set-language-info-alist
  95  "Tamil" '((charset unicode)
  96            (coding-system utf-8)
  97            (coding-priority utf-8)
  98            (input-method . "tamil-itrans")
  99            (documentation . "\
 100 South Indian Language Tamil is supported in this language environment."))
 101  '("Indian"))
 102
 103 (set-language-info-alist
 104  "Telugu" '((charset unicode)
 105             (coding-system utf-8)
 106             (coding-priority utf-8)
 107             (input-method . "telugu-itrans")
 108             (documentation . "\
 109 South Indian Language Telugu is supported in this language environment."))
 110  '("Indian"))
 111
 112 (set-language-info-alist
 113  "Kannada" '((charset unicode)
 114              (coding-system mule-utf-8)
 115              (coding-priority mule-utf-8)
 116              (input-method . "kannada-itrans")
 117              (sample-text . "Kannada (ಕನ್ನಡ)  ನಮಸ್ಕಾರ")
 118              (documentation . "\
 119 Kannada language and script is supported in this language
 120 environment."))
 121  '("Indian"))
 122
 123 (set-language-info-alist
 124  "Malayalam" '((charset unicode)
 125                (coding-system utf-8)
 126                (coding-priority utf-8)
 127                (input-method . "malayalam-itrans")
 128                (documentation . "\
 129 South Indian language Malayalam is supported in this language environment."))
 130  '("Indian"))
 131
 132 ;; Replace mnemonic characters in REGEXP according to TABLE.  TABLE is
 133 ;; an alist of (MNEMONIC-STRING . REPLACEMENT-STRING).
 134
 135 (defun indian-compose-regexp (regexp table)
 136   (let ((case-fold-search nil))
 137     (dolist (elt table)
 138       (setq regexp (replace-regexp-in-string (car elt) (cdr elt) regexp t t)))
 139     regexp))
 140
 141 (defconst devanagari-composable-pattern
 142   (let ((table
 143          '(("V" . "[\u0904-\u0914\u0960-\u0961\u0972]") ; independent vowel
 144            ("C" . "[\u0915-\u0939]")             ; consonant
 145            ("R" . "\u0930")                      ; RA
 146            ("n" . "\u093C")                      ; NUKTA
 147            ("H" . "\u094D")                      ; HALANT
 148            ("m" . "\u093F")                      ; vowel sign (pre)
 149            ("u" . "[\u0945-\u0948\u0955]")       ; vowel sign (above)
 150            ("b" . "[\u0941-\u0944\u0962-\u0963]") ; vowel sign (below)
 151            ("p" . "[\u093E\u0940\u0949-\u094C]") ; vowel sign (post)
 152            ("A" . "[\u0900-\u0902\u0953-\u0954]") ; vowel modifier (above)
 153            ("a" . "\u0903")                      ; vowel modifier (post)
 154            ("S" . "\u0951")                      ; stress sign (above)
 155            ("s" . "\u0952")                      ; stress sign (below)
 156            ("N" . "\u200C")                      ; ZWNJ
 157            ("J" . "\u200D")                      ; ZWJ
 158            ("X" . "[\u0900-\u097F]"))))          ; all coverage
 159     (indian-compose-regexp
 160      (concat
 161       ;; syllables with an independent vowel, or
 162       "\\(?:RH\\)?Vn?m?b?u?p?n?A?s?S?a?\\|"
 163       ;; consonant-based syllables, or
 164       "\\(?:Cn?J?HJ?\\)*Cn?\\(?:H[NJ]?\\|m?b?u?p?n?A?s?S?a?\\)\\|"
 165       ;; special consonant form, or
 166       "JHR\\|"
 167       ;; any other singleton characters
 168       "X")
 169      table))
 170   "Regexp matching a composable sequence of Devanagari characters.")
 171
 172 (defconst tamil-composable-pattern
 173   (concat
 174    "\\([அ-ஔ]\\)\\|"
 175    "[ஂஃ]\\|" ;; vowel modifier considered independent
 176    "\\(\\(?:\\(?:க்ஷ\\)\\|[க-ஹ]\\)[்ா-ௌ]?\\)\\|"
 177    "\\(ஷ்ரீ\\)")
 178   "Regexp matching a composable sequence of Tamil characters.")
 179
 180 (defconst kannada-composable-pattern
 181   (concat
 182    "\\([ಂ-ಔೠಌ]\\)\\|[ಃ]"
 183    "\\|\\("
 184    "\\(?:\\(?:[ಕ-ಹ]್\\)?\\(?:[ಕ-ಹ]್\\)?\\(?:[ಕ-ಹ]್\\)?[ಕ-ಹ]್\\)?"
 185    "[ಕ-ಹ]\\(?:್\\|[ಾ-್ೕೃ]?\\)?"
 186    "\\)")
 187   "Regexp matching a composable sequence of Kannada characters.")
 188
 189 (defconst malayalam-composable-pattern
 190   (let ((table
 191          '(("V" . "[\u0D05-\u0D14\u0D60-\u0D61]") ; independent vowel
 192            ("C" . "[\u0D15-\u0D39]")              ; consonant
 193            ("m" . "[\u0D46-\u0D48\u0D4A-\u0D4C]") ; prebase matra
 194            ("p" . "[\u0D3E-\u0D44\u0D57]")        ; postbase matra
 195            ("b" . "[\u0D62-\u0D63]")              ; belowbase matra
 196            ("a" . "[\u0D02-\u0D03]")              ; abovebase sign
 197            ("H" . "\u0D4D")                       ; virama sign
 198            ("N" . "\u200C")                       ; ZWNJ
 199            ("J" . "\u200D")                       ; ZWJ
 200            ("X" . "[\u0D00-\u0D7F]"))))           ; all coverage
 201     (indian-compose-regexp
 202      (concat
 203       ;; syllables with an independent vowel, or
 204       "V\\(?:J?HC\\)?m?b?p?a?\\|"
 205       ;; consonant-based syllables, or
 206       "\\(?:CJ?HJ?\\)\\{0,4\\}C\\(?:H[NJ]?\\|m?b?p?a?\\)\\|"
 207       ;; special consonant form, or
 208       "JHC\\|"
 209       ;; any other singleton characters
 210       "X")
 211      table))
 212   "Regexp matching a composable sequence of Malayalam characters.")
 213
 214 (let ((script-regexp-alist
 215        `((devanagari . ,devanagari-composable-pattern)
 216          (bengali . "[\x980-\x9FF\x200C\x200D]+")
 217          (gurmukhi . "[\xA00-\xA7F\x200C\x200D]+")
 218          (gujarati . "[\xA80-\xAFF\x200C\x200D]+")
 219          (oriya . "[\xB00-\xB7F\x200C\x200D]+")
 220          (tamil . "[\xB80-\xBFF\x200C\x200D]+")
 221          (telugu . "[\xC00-\xC7F\x200C\x200D]+")
 222          (kannada . "[\xC80-\xCFF\x200C\x200D]+")
 223          (malayalam . ,malayalam-composable-pattern))))
 224   (map-char-table
 225    #'(lambda (key val)
 226        (let ((slot (assq val script-regexp-alist)))
 227          (if slot
 228              (set-char-table-range
 229               composition-function-table key
 230               (list (vector (cdr slot) 0 'font-shape-gstring))))))
 231    char-script-table))
 232
 233 (provide 'indian)
 234
 235 ;; arch-tag: 83aa8fc7-7ee2-4364-a6e5-498f5e3b8c2f
 236 ;;; indian.el ends here