code.delx.au - gnu-emacs/blob - lisp/language/devan-util.el

   1 ;;; devan-util.el --- Support for composing Devanagari characters -*-coding: iso-2022-7bit;-*-
   2
   3 ;; Copyright (C) 1997, 1998, 2001, 2002, 2003
   4 ;;   Free Software Foundation, Inc.
   5 ;; Copyright (C) 1997, 1998, 1999, 2000
   6 ;;   National Institute of Advanced Industrial Science and Technology (AIST)
   7 ;;   Registration Number H14PRO021
   8
   9 ;; Maintainer:  KAWABATA, Taichi <kawabata@m17n.org>
  10 ;; Keywords: multilingual, Devanagari
  11
  12 ;; This file is part of GNU Emacs.
  13
  14 ;; GNU Emacs is free software; you can redistribute it and/or modify
  15 ;; it under the terms of the GNU General Public License as published by
  16 ;; the Free Software Foundation; either version 2, or (at your option)
  17 ;; any later version.
  18
  19 ;; GNU Emacs is distributed in the hope that it will be useful,
  20 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22 ;; GNU General Public License for more details.
  23
  24 ;; You should have received a copy of the GNU General Public License
  25 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  26 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  27 ;; Boston, MA 02110-1301, USA.
  28
  29 ;; Created: Feb. 17. 2001
  30
  31 ;;; Commentary:
  32
  33 ;; This file provides character(Unicode) to glyph(CDAC) conversion and
  34 ;; composition of Devanagari script characters.
  35
  36 ;;; Code:
  37
  38 ;; Devanagari Composable Pattern
  39 ;;    C .. Consonants
  40 ;;    V .. Vowel
  41 ;;    H .. Halant
  42 ;;    M .. Matra
  43 ;;    V .. Vowel
  44 ;;    A .. Anuswar
  45 ;;    D .. Chandrabindu
  46 ;;    (N .. Zerowidth Non Joiner)
  47 ;;    (J .. Zerowidth Joiner.  )
  48 ;; 1. vowel
  49 ;;  V(A/D)?
  50 ;; 2. syllable : maximum of 5 consecutive consonants.  (e.g. kartsnya)
  51 ;;  ((CH)?(CH)?(CH)?CH)?C(H|M?(A|D)?)?
  52
  53 (defconst devanagari-consonant
  54   "[\e$,15U\e(B-\e$,15y68\e(B-\e$,16?\e(B]")
  55
  56     ;;("\e$,16B\e(B" . nil)
  57     ;;("\e$,16A\e(B" . nil)
  58     ;;("\e$,16C\e(B" . nil)
  59
  60
  61 (defconst devanagari-composable-pattern
  62   (concat
  63    "\\([\e$,15E\e(B-\e$,15T6@6A\e(B][\e$,15A5B\e(B]?\\)\\|[\e$,15C6D\e(B]"
  64    "\\|\\("
  65    "\\(?:\\(?:[\e$,15U\e(B-\e$,15y68\e(B-\e$,16?\e(B]\e$,16-\e(B\\)?\\(?:[\e$,15U\e(B-\e$,15y68\e(B-\e$,16?\e(B]\e$,16-\e(B\\)?\\(?:[\e$,15U\e(B-\e$,15y68\e(B-\e$,16?\e(B]\e$,16-\e(B\\)?[\e$,15U\e(B-\e$,15y68\e(B-\e$,16?\e(B]\e$,16-\e(B\\)?"
  66    "[\e$,15U\e(B-\e$,15y68\e(B-\e$,16?\e(B]\\(?:\e$,16-\e(B\\|[\e$,15~\e(B-\e$,16-6B6C\e(B]?[\e$,15B5A\e(B]?\\)?"
  67    "\\)")
  68   "Regexp matching a composable sequence of Devanagari characters.")
  69
  70 (dolist (range '((#x0903 . #x0903)
  71                  (#x0905 . #x0939)
  72                  (#x0958 . #x0961)))
  73   (set-char-table-range indian-composable-pattern range
  74                         devanagari-composable-pattern))
  75
  76 ;;;###autoload
  77 (defun devanagari-compose-region (from to)
  78   (interactive "r")
  79   (save-excursion
  80     (save-restriction
  81       (narrow-to-region from to)
  82       (goto-char (point-min))
  83       (while (re-search-forward devanagari-composable-pattern nil t)
  84         (devanagari-compose-syllable-region (match-beginning 0)
  85                                             (match-end 0))))))
  86 (defun devanagari-compose-string (string)
  87   (with-temp-buffer
  88     (insert (decompose-string string))
  89     (devanagari-compose-region (point-min) (point-max))
  90     (buffer-string)))
  91
  92 ;;;###autoload
  93 (defun devanagari-post-read-conversion (len)
  94   (save-excursion
  95     (save-restriction
  96       (let ((buffer-modified-p (buffer-modified-p)))
  97         (narrow-to-region (point) (+ (point) len))
  98         (devanagari-compose-region (point-min) (point-max))
  99         (set-buffer-modified-p buffer-modified-p)
 100         (- (point-max) (point-min))))))
 101
 102 (defun devanagari-regexp-of-hashtbl-keys (hashtbl)
 103   "Return a regular expression that matches all keys in hashtable HASHTBL."
 104   (let ((max-specpdl-size 1000))
 105     (regexp-opt
 106      (sort
 107       (let (dummy)
 108         (maphash (function (lambda (key val) (setq dummy (cons key dummy)))) hashtbl)
 109         dummy)
 110       (function (lambda (x y) (> (length x) (length y))))))))
 111
 112 ;;;###autoload
 113 (defun devanagari-composition-function (pos &optional string)
 114   "Compose Devanagari characters after the position POS.
 115 If STRING is not nil, it is a string, and POS is an index to the string.
 116 In this case, compose characters after POS of the string."
 117   (if string
 118       ;; Not yet implemented.
 119       nil
 120     (goto-char pos)
 121     (if (looking-at devanagari-composable-pattern)
 122         (prog1 (match-end 0)
 123           (devanagari-compose-syllable-region pos (match-end 0))))))
 124
 125 ;; Notes on conversion steps.
 126
 127 ;; 1. chars to glyphs
 128 ;;
 129 ;; Rules will not be applied to the halant appeared at the end of the
 130 ;; text.  Also, the preceding/following "r" will be treated as special case.
 131
 132 ;; 2. glyphs reordering.
 133 ;;
 134 ;; The glyphs are split by halant, and each glyph groups are
 135 ;; re-ordered in the following order.
 136 ;;
 137 ;; Note that `consonant-glyph' mentioned here does not contain the
 138 ;; vertical bar (right modifier) attached at the right of the
 139 ;; consonant.
 140 ;;
 141 ;; If the glyph-group contains right modifier,
 142 ;;  (1) consonant-glyphs/vowels, with nukta sign
 143 ;;  (2) spacing
 144 ;;  (3) right modifier (may be matra)
 145 ;;  (4) top matra
 146 ;;  (5) preceding "r"
 147 ;;  (6) anuswar
 148 ;;  (7) following "r"
 149 ;;  (8) bottom matra or halant.
 150 ;;
 151 ;; Otherwise,
 152 ;;  (1) consonant-glyph/vowels, with nukta sign
 153 ;;  (3) left matra
 154 ;;  (4) top matra
 155 ;;  (5) preceding "r"
 156 ;;  (6) anuswar
 157 ;;  (7) following "r"
 158 ;;  (8) bottom matra or halant.
 159 ;;  (2) spacing
 160
 161 ;; 3. glyph to glyph
 162 ;;
 163 ;; For better display, some glyph display would be tuned.
 164
 165 ;; 4. Composition.
 166 ;;
 167 ;; left modifiers will be attached at the left.
 168 ;; others will be attached right.
 169
 170 ;; Problem::
 171 ;;  Can we generalize this methods to other Indian scripts?
 172
 173 (defvar dev-char-glyph
 174   '(("\e$,15E\e(B" . "\e$,4 K\e(B")
 175     ("\e$,15F\e(B" . "\e$,4 K")\e(B")
 176     ("\e$,15~\e(B" . "\e$,4")\e(B")
 177     ("\e$,15G\e(B" . "\e$,4 \\e(B")
 178     ("\e$,15\7f\e(B" . "\e$,4"*\e(B")
 179     ("\e$,15\7f5A\e(B" . "\e$,4"*\e(B\\e$,4"&\e(B")
 180     ("\e$,15H\e(B" . "\e$,4 \"'\e(B")
 181     ("\e$,15H5A\e(B" . "\e$,4 \"'"&\e(B")
 182     ("\e$,16 \e(B" . "\e$,4"2\e(B")
 183     ("\e$,16 5A\e(B" . "\e$,4"2"&\e(B")
 184     ("\e$,15I\e(B" . "\e$,4 ]\e(B")
 185     ("\e$,16!\e(B" . "\e$,4"6\e(B")
 186     ("\e$,15J\e(B" . "\e$,4 ^"P\e(B")
 187     ("\e$,16"\e(B" . "\e$,4":\e(B")
 188     ("\e$,15K\e(B" . "\e$,4 `"Q\e(B")
 189     ("\e$,16#\e(B" . "\e$,4">\e(B")
 190     ;;("\e$,15L\e(B" . nil) ; not implemented.
 191     ("\e$,16$\e(B" . "\e$,4"?\e(B")
 192     ("\e$,15M\e(B" . "\e$,4 b"L\e(B")
 193     ("\e$,15M5A\e(B" . "\e$,4 b"$\e(B")
 194     ("\e$,15M5B\e(B" . "\e$,4 b"$\e(B")
 195     ("\e$,16%\e(B" . "\\e$,4"L\e(B")
 196     ("\e$,15N\e(B" . "\e$,4 b"@\e(B")
 197     ("\e$,15N5A\e(B" . "\e$,4 b"@"&\e(B")
 198     ("\e$,16&\e(B" . "\\e$,4"@\e(B")
 199     ("\e$,16&5A\e(B" . "\\e$,4"@\e(B\\e$,4"&\e(B")
 200     ("\e$,15O\e(B" . "\e$,4 b\e(B")
 201     ("\e$,16'\e(B" . "\\e$,4"D\e(B")
 202     ("\e$,16'5A\e(B" . "\\e$,4"D\e(B\\e$,4"&\e(B")
 203     ("\e$,15P\e(B" . "\e$,4 b"D\e(B")
 204     ("\e$,15P5A\e(B" . "\e$,4 b"D"&\e(B")
 205     ("\e$,16(\e(B" . "\\e$,4"H\e(B")
 206     ("\e$,16(5A\e(B" . "\\e$,4"H\e(B\\e$,4"&\e(B")
 207     ("\e$,15Q\e(B" . "\e$,4 K")"L\e(B") ;; special rule for reodering.
 208     ("\e$,15Q5A\e(B" . "\e$,4 K")"$\e(B")
 209     ("\e$,15Q5B\e(B" . "\e$,4 K")"$\e(B")
 210     ("\e$,16)\e(B" . "\\e$,4")"L\e(B")
 211     ("\e$,16)5A\e(B" . "\\e$,4")"$\e(B")
 212     ("\e$,16)5B\e(B" . "\\e$,4")"$\e(B")
 213     ("\e$,15R\e(B" . "\e$,4 K")"@\e(B")
 214     ("\e$,15R5A\e(B" . "\e$,4 K")"@"&\e(B")
 215     ("\e$,16*\e(B" . "\\e$,4")"@\e(B")
 216     ("\e$,16*5A\e(B" . "\\e$,4")"@"&\e(B")
 217     ("\e$,15S\e(B" . "\e$,4 K")"D\e(B")
 218     ("\e$,15S5A\e(B" . "\e$,4 K")"D"&\e(B")
 219     ("\e$,16+\e(B" . "\\e$,4")"D\e(B")
 220     ("\e$,16+5A\e(B" . "\\e$,4")"D"&\e(B")
 221     ("\e$,15T\e(B" . "\e$,4 K")"H\e(B")
 222     ("\e$,15T5A\e(B" . "\e$,4 K")"H"&\e(B")
 223     ("\e$,16,\e(B" . "\\e$,4")"H\e(B")
 224     ("\e$,16,5A\e(B" . "\\e$,4")"H"&\e(B")
 225     ("\e$,16@\e(B" . "\e$,4 a"Q\e(B")
 226     ;;("\e$,16B\e(B" . nil)
 227     ;;("\e$,16A\e(B" . nil)
 228     ;;("\e$,16C\e(B" . nil)
 229
 230     ;; GRUTTALS
 231     ("\e$,15U\e(B" . "\e$,4 e"R\e(B")
 232     ("\e$,15U6-\e(B" . "\e$,4 c\e(B")
 233     ("\e$,15U6-5p\e(B" . "\e$,4 g"R\e(B")
 234     ("\e$,15U6-5d\e(B" . "\e$,4 h"R\e(B")
 235     ("\e$,15U6-5w\e(B" . "\e$,4 i")\e(B")
 236     ("\e$,15U6-5w6-\e(B" . "\e$,4 i\e(B")
 237
 238     ("\e$,15V\e(B" . "\e$,4 j")\e(B")
 239     ("\e$,15V6-\e(B" . "\e$,4 j\e(B")
 240     ("\e$,15V6-5p\e(B" . "\e$,4 l")\e(B")
 241     ("\e$,15V6-5p6-\e(B" . "\e$,4 l\e(B")
 242
 243     ("\e$,15W\e(B" . "\e$,4 m")\e(B")
 244     ("\e$,15W6-\e(B" . "\e$,4 m\e(B")
 245     ("\e$,15W6-5p\e(B" . "\e$,4 o")\e(B")
 246     ("\e$,15W6-5p6-\e(B" . "\e$,4 o\e(B")
 247
 248     ("\e$,15X\e(B" . "\e$,4 p")\e(B")
 249     ("\e$,15X6-\e(B" . "\e$,4 p\e(B")
 250     ("\e$,15X6-5p\e(B" . "\e$,4 q")\e(B")
 251     ("\e$,15X6-5p6-\e(B" . "\e$,4 q\e(B")
 252
 253     ("\e$,15Y\e(B" . "\e$,4 r"S\e(B")
 254     ;; PALATALS
 255     ("\e$,15Z\e(B" . "\e$,4 s")\e(B")
 256     ("\e$,15Z6-\e(B" . "\e$,4 s\e(B")
 257     ("\e$,15Z6-5p\e(B" . "\e$,4 t")\e(B")
 258     ("\e$,15Z6-5p6-\e(B" . "\e$,4 t\e(B")
 259
 260     ("\e$,15[\e(B" . "\e$,4 u"T\e(B")
 261
 262     ("\e$,15\\e(B" . "\e$,4 v")\e(B")
 263     ("\e$,15\6-\e(B" . "\e$,4 v\e(B")
 264     ("\e$,15\6-5p\e(B" . "\e$,4 x")\e(B")
 265     ("\e$,15\6-5p6-\e(B" . "\e$,4 x\e(B")
 266     ("\e$,15\6-5^\e(B" . "\e$,4 y")\e(B")
 267     ("\e$,15\6-5^6-\e(B" . "\e$,4 y\e(B")
 268
 269     ("\e$,15]\e(B" . "\e$,4 z")\e(B")
 270     ("\e$,15]6-\e(B" . "\e$,4 z\e(B")
 271     ("\e$,15]6-5p\e(B" . "\e$,4 {")\e(B")
 272     ("\e$,15]6-5p6-\e(B" . "\e$,4 {\e(B")
 273
 274     ("\e$,15^\e(B" . "\e$,4 |")\e(B")
 275     ("\e$,15^6-\e(B" . "\e$,4 |\e(B")
 276     ;; CEREBRALS
 277     ("\e$,15_\e(B" . "\e$,4 }"U\e(B")
 278     ("\e$,15_6-5_\e(B" . "\e$,4 ~"U\e(B")
 279     ("\e$,15_6-5`\e(B" . "\e$,4 \7f"U\e(B")
 280
 281     ("\e$,15`\e(B" . "\e$,4! "V\e(B")
 282     ("\e$,15`6-5`\e(B" . "\e$,4!!"V\e(B")
 283
 284     ("\e$,15a\e(B" . "\e$,4!""W\e(B")
 285     ("\e$,15a6-5a\e(B" . "\e$,4!$"W\e(B")
 286     ("\e$,15a6-5b\e(B" . "\e$,4!%"W\e(B")
 287
 288     ("\e$,15b\e(B" . "\e$,4!&"X\e(B")
 289
 290     ("\e$,15c\e(B" . "\e$,4!(")\e(B")
 291     ("\e$,15c6-\e(B" . "\e$,4!(\e(B")
 292     ;; DENTALS
 293     ("\e$,15d\e(B" . "\e$,4!)")\e(B")
 294     ("\e$,15d6-\e(B" . "\e$,4!)\e(B")
 295     ("\e$,15d6-5p\e(B" . "\e$,4!*")\e(B")
 296     ("\e$,15d6-5p6-\e(B" . "\e$,4!*\e(B")
 297     ("\e$,15d6-5d\e(B" . "\e$,4!+")\e(B")
 298     ("\e$,15d6-5d6-\e(B" . "\e$,4!+\e(B")
 299
 300     ("\e$,15e\e(B" . "\e$,4!,")\e(B")
 301     ("\e$,15e6-\e(B" . "\e$,4!,\e(B")
 302     ("\e$,15e6-5p\e(B" . "\e$,4!-")\e(B")
 303     ("\e$,15e6-5p6-\e(B" . "\e$,4!-\e(B")
 304
 305     ("\e$,15f\e(B" . "\e$,4!."Y\e(B")
 306     ("\e$,15f6#\e(B" . "\e$,4!/"Y\e(B")
 307     ("\e$,15f6-5p\e(B" . "\e$,4!0"Y\e(B")
 308     ("\e$,15f6-5f\e(B" . "\e$,4!1"Y\e(B")
 309     ("\e$,15f6-5g\e(B" . "\e$,4!2"Y\e(B")
 310     ("\e$,15f6-5n\e(B" . "\e$,4!3\e(B")
 311     ("\e$,15f6-5o\e(B" . "\e$,4!4\e(B")
 312     ("\e$,15f6-5u\e(B" . "\e$,4!5"Y\e(B")
 313
 314     ("\e$,15g\e(B" . "\e$,4!6")\e(B")
 315     ("\e$,15g6-\e(B" . "\e$,4!6\e(B")
 316     ("\e$,15g6-5p\e(B" . "\e$,4!7")\e(B")
 317     ("\e$,15g6-5p6-\e(B" . "\e$,4!7\e(B")
 318
 319     ("\e$,15h\e(B" . "\e$,4!8")\e(B")
 320     ("\e$,15h6-\e(B" . "\e$,4!8\e(B")
 321     ("\e$,15h6-5p\e(B" . "\e$,4!9")\e(B")
 322     ("\e$,15h6-5p6-\e(B" . "\e$,4!9")\e(B")
 323     ("\e$,15h6-5h\e(B" . "\e$,4!:")\e(B")
 324     ("\e$,15h6-5h6-\e(B" . "\e$,4!:\e(B")
 325
 326     ("\e$,15i\e(B" . "\e$,4!8"#")\e(B")
 327     ;; LABIALS
 328     ("\e$,15j\e(B" . "\e$,4!;")\e(B")
 329     ("\e$,15j6-\e(B" . "\e$,4!;\e(B")
 330     ("\e$,15j6-5p\e(B" . "\e$,4!<")\e(B")
 331     ("\e$,15j6-5p6-\e(B" . "\e$,4!<\e(B")
 332
 333     ("\e$,15k\e(B" . "\e$,4!a"[\e(B")
 334     ("\e$,15k6-\e(B" . "\e$,4!=\e(B")
 335     ("\e$,15k6-5p\e(B" . "\e$,4!c"[\e(B")
 336
 337     ("\e$,15l\e(B" . "\e$,4!d")\e(B")
 338     ("\e$,15l6-\e(B" . "\e$,4!d\e(B")
 339     ("\e$,15l6-5p\e(B" . "\e$,4!e")\e(B")
 340     ("\e$,15l6-5p6-\e(B" . "\e$,4!e\e(B")
 341
 342     ("\e$,15m\e(B" . "\e$,4!f")\e(B")
 343     ("\e$,15m6-\e(B" . "\e$,4!f\e(B")
 344     ("\e$,15m6-5p\e(B" . "\e$,4!g")\e(B")
 345     ("\e$,15m6-5p6-\e(B" . "\e$,4!g\e(B")
 346
 347     ("\e$,15n\e(B" . "\e$,4!h")\e(B")
 348     ("\e$,15n6-\e(B" . "\e$,4!h\e(B")
 349     ("\e$,15n6-5p\e(B" . "\e$,4!i")\e(B")
 350     ("\e$,15n6-5p6-\e(B" . "\e$,4!i\e(B")
 351     ;; SEMIVOWELS
 352     ("\e$,15o\e(B" . "\e$,4!j")\e(B")
 353     ("\e$,15o6-\e(B" . "\e$,4!j\e(B")
 354     ("\e$,15o6-5p\e(B" . "\e$,4!k")\e(B")
 355     ("\e$,15o6-5p6-\e(B" . "\e$,4!k\e(B")
 356     ("\e$,16-5o\e(B" . "\e$,4!l\e(B") ;; when every ohter lig. fails.
 357
 358     ("\e$,15p\e(B" . "\e$,4!n"W\e(B")
 359     ;; ("\e$,15p6-\e(B" . "\\e$,4"'\e(B") ;; special case.  only the topmost pos.
 360     ("\e$,15q\e(B" . "\e$,4!n"#"W\e(B")
 361     ("\e$,15q6-\e(B" . "\e$,4!m\e(B") ;; IS 13194 speical rule.
 362     ("\e$,15p6!\e(B" . "\e$,4!o"[\e(B")
 363     ("\e$,15p6"\e(B" . "\e$,4!p"\\e(B")
 364
 365     ("\e$,15r\e(B" . "\e$,4!q")\e(B")
 366     ("\e$,15r6-\e(B" . "\e$,4!q\e(B")
 367     ("\e$,15s\e(B" . "\e$,4!s\e(B")
 368     ("\e$,15s6-\e(B" . "\e$,4!r\e(B")
 369     ("\e$,15t\e(B" . "\e$,4!s"#\e(B")
 370     ("\e$,15t6-\e(B" . "\e$,4!r"#\e(B")
 371
 372     ("\e$,15u\e(B" . "\e$,4!t")\e(B")
 373     ("\e$,15u6-\e(B" . "\e$,4!t\e(B")
 374     ("\e$,15u6-5p\e(B" . "\e$,4!u")\e(B")
 375     ("\e$,15u6-5p6-\e(B" . "\e$,4!u\e(B")
 376     ;; SIBILANTS
 377     ("\e$,15v\e(B" . "\e$,4!v")\e(B")
 378     ("\e$,15v6-\e(B" . "\e$,4!v\e(B")
 379     ("\e$,15v6-5u\e(B" . "\e$,4!w")\e(B")
 380     ("\e$,15v6-5u6-\e(B" . "\e$,4!w\e(B")
 381     ("\e$,15v6-5p\e(B" . "\e$,4!x")\e(B")
 382     ("\e$,15v6-5p6-\e(B" . "\e$,4!x\e(B")
 383
 384     ("\e$,15w\e(B" . "\e$,4!y")\e(B")
 385     ("\e$,15w6-\e(B" . "\e$,4!y\e(B")
 386     ("\e$,15x\e(B" . "\e$,4!z")\e(B")
 387     ("\e$,15x6-\e(B" . "\e$,4!z\e(B")
 388     ("\e$,15x6-5p\e(B" . "\e$,4!{")\e(B")
 389     ("\e$,15x6-5p6-\e(B" . "\e$,4!{\e(B")
 390
 391     ("\e$,15y\e(B" . "\e$,4!}\e(B")
 392     ("\e$,15y6-\e(B" . "\e$,4!|\e(B")
 393     ("\e$,15y6#\e(B" . "\e$,4!~\e(B")
 394     ("\e$,15y6-5p\e(B" . "\e$,4!\7f\e(B")
 395     ("\e$,15y6-5n\e(B" . "\e$,4" \e(B")
 396     ("\e$,15y6-5o\e(B" . "\e$,4"!\e(B")
 397     ;; NUKTAS
 398     ("\e$,168\e(B" . "\e$,4 f"R"S\e(B")
 399     ("\e$,1686-\e(B" . "\e$,4 d\e(B")
 400     ("\e$,169\e(B" . "\e$,4 k")\e(B")
 401     ("\e$,1696-\e(B" . "\e$,4 k\e(B")
 402     ("\e$,16:\e(B" . "\e$,4 n")\e(B")
 403     ("\e$,16:6-\e(B" . "\e$,4 n\e(B")
 404     ("\e$,16;\e(B" . "\e$,4 w")\e(B")
 405     ("\e$,16;6-\e(B" . "\e$,4 w\e(B")
 406     ("\e$,16<\e(B" . "\e$,4!#"W\e(B")
 407     ("\e$,16=\e(B" . "\e$,4!'"X\e(B")
 408     ("\e$,16>\e(B" . "\e$,4!b"[\e(B")
 409     ("\e$,16>6-\e(B" . "\e$,4!>\e(B")
 410     ("\e$,16?\e(B" . "\e$,4!j"#")\e(B")
 411     ;; misc modifiers.
 412     ("\e$,15A\e(B" . "\\e$,4"$\e(B")
 413     ("\e$,15B\e(B" . "\\e$,4"&\e(B")
 414     ("\e$,15C\e(B" . "\e$,4 F\e(B")
 415     ("\e$,15|\e(B" . "\e$,4"#\e(B")
 416     ("\e$,15}\e(B" . "\e$,4 E\e(B")
 417     ("\e$,16-\e(B" . "\e$,4""\e(B")
 418     ("\e$,16-5p\e(B" . "\e$,4"%\e(B") ;; following "r"
 419     ;; ("\e$,160\e(B" . "\e$,4 D\e(B")
 420     ("\e$,16D\e(B" . "\e$,4 J\e(B")
 421     ;; ("\e$,16F\e(B" . "")
 422     ;; ("\e$,16G\e(B" . "")
 423     ;; ("\e$,16H\e(B" . "")
 424     ;; ("\e$,16I\e(B" . "")
 425     ;; ("\e$,16J\e(B" . "")
 426     ;; ("\e$,16K\e(B" . "")
 427     ;; ("\e$,16L\e(B" . "")
 428     ;; ("\e$,16M\e(B" . "")
 429     ;; ("\e$,16N\e(B" . "")
 430     ;; ("\e$,16O\e(B" . "")
 431     )
 432   "Devanagari characters to glyphs conversion table.
 433 Default value contains only the basic rules.  You may add your own
 434 preferred rule from the sanskrit fonts."  )
 435
 436 (defvar dev-char-glyph-hash
 437   (let* ((hash (make-hash-table :test 'equal)))
 438     (mapc (function (lambda (x) (puthash (car x) (cdr x) hash)))
 439           dev-char-glyph)
 440     hash))
 441
 442 (defvar dev-char-glyph-regexp
 443   (devanagari-regexp-of-hashtbl-keys dev-char-glyph-hash))
 444
 445 ;; glyph-to-glyph conversion table.
 446 ;; it is supposed that glyphs are ordered in
 447 ;;   [consonant/nukta] - [matra/halant] - [preceding-r] - [anuswar].
 448
 449 (defvar dev-glyph-glyph
 450   '(("\\e$,4"'\e(B\\e$,4"&\e(B" . "\\e$,4"(\e(B")
 451     ("\\e$,4"'\e(B\\e$,4"$\e(B" . "\\e$,4"(\e(B")
 452     ("\e$,4"*\e(B\\e$,4"&\e(B" . "\e$,4"+\e(B")
 453     ("\e$,4"*\e(B\\e$,4"'\e(B" . "\e$,4",\e(B")
 454     ("\e$,4"*\e(B\\e$,4"'\e(B\\e$,4"&\e(B" . "\e$,4"-\e(B")
 455     ("\e$,4"2\e(B\\e$,4"&\e(B" . "\e$,4"3\e(B")
 456     ("\e$,4"2\e(B\\e$,4"'\e(B" . "\e$,4"4\e(B")
 457     ("\e$,4"2\e(B\\e$,4"'\e(B\\e$,4"&\e(B" . "\e$,4"5\e(B")
 458     ("\e$,4"#\e(B\\e$,4"6\e(B" . "\e$,4"7\e(B")
 459     ("\e$,4"%\e(B\\e$,4"6\e(B" . "\e$,4"8\e(B")
 460     ;;("\e$,4"6\e(B" . "\e$,4"9\e(B")
 461     ("\e$,4"#\e(B\\e$,4":\e(B" . "\e$,4";\e(B")
 462     ("\e$,4"%\e(B\\e$,4":\e(B" . "\e$,4"<\e(B")
 463     ;;("\e$,4":\e(B" . "\e$,4"=\e(B")
 464     ("\\e$,4"@\e(B\\e$,4"&\e(B" . "\\e$,4"A\e(B")
 465     ("\\e$,4"@\e(B\\e$,4"'\e(B" . "\\e$,4"B\e(B")
 466     ("\\e$,4"@\e(B\\e$,4"'\e(B\\e$,4"&\e(B" . "\\e$,4"C\e(B")
 467     ("\\e$,4"D\e(B\\e$,4"&\e(B" . "\\e$,4"E\e(B")
 468     ("\\e$,4"D\e(B\\e$,4"'\e(B" . "\\e$,4"F\e(B")
 469     ("\\e$,4"D\e(B\\e$,4"'\e(B\\e$,4"&\e(B" . "\\e$,4"G\e(B")
 470     ("\\e$,4"H\e(B\\e$,4"&\e(B" . "\\e$,4"I\e(B")
 471     ("\\e$,4"H\e(B\\e$,4"'\e(B" . "\\e$,4"J\e(B")
 472     ("\\e$,4"H\e(B\\e$,4"'\e(B\\e$,4"&\e(B" . "\\e$,4"K\e(B")
 473     ("\\e$,4"L\e(B\\e$,4"&\e(B" . "\\e$,4"M\e(B")
 474     ("\\e$,4"L\e(B\\e$,4"'\e(B" . "\\e$,4"N\e(B")
 475     ("\\e$,4"L\e(B\\e$,4"'\e(B\\e$,4"&\e(B" . "\\e$,4"O\e(B")
 476     ))
 477 (defvar dev-glyph-glyph-hash
 478   (let* ((hash (make-hash-table :test 'equal)))
 479     (mapc (function (lambda (x) (puthash (car x) (cdr x) hash)))
 480           dev-glyph-glyph)
 481     hash))
 482 (defvar dev-glyph-glyph-regexp
 483   (devanagari-regexp-of-hashtbl-keys dev-glyph-glyph-hash))
 484
 485
 486 ;; yet another glyph-to-glyph conversions.
 487 (defvar dev-glyph-glyph-2
 488   '(("\e$,4"*\e(B" . "\e$,4".\e(B")
 489     ("\e$,4"+\e(B" . "\e$,4"/\e(B")
 490     ("\e$,4",\e(B" . "\e$,4"0\e(B")
 491     ("\e$,4"-\e(B" . "\e$,4"1\e(B")))
 492 (defvar dev-glyph-glyph-2-hash
 493   (let* ((hash (make-hash-table :test 'equal)))
 494     (mapc (function (lambda (x) (puthash (car x) (cdr x) hash)))
 495           dev-glyph-glyph-2)
 496     hash))
 497 (defvar dev-glyph-glyph-2-regexp
 498   (devanagari-regexp-of-hashtbl-keys dev-glyph-glyph-2-hash))
 499
 500 (defun dev-charseq (from &optional to)
 501   (if (null to) (setq to from))
 502   (number-sequence (decode-char 'devanagari-cdac from)
 503                    (decode-char 'devanagari-cdac to)))
 504
 505 (defvar dev-glyph-cvn
 506   (append
 507    (dev-charseq #x2b)
 508    (dev-charseq #x3c #xc1)
 509    (dev-charseq #xc3))
 510   "Devanagari Consonants/Vowels/Nukta Glyphs")
 511
 512 (defvar dev-glyph-space
 513   (dev-charseq #xf0 #xfe)
 514   "Devanagari Spacing Glyphs")
 515
 516 (defvar dev-glyph-right-modifier
 517   (append
 518    (dev-charseq #xc9)
 519    (dev-charseq #xd2 #xd5))
 520   "Devanagari Modifiers attached at the right side.")
 521
 522 (defvar dev-glyph-right-modifier-regexp
 523   (concat "[" dev-glyph-right-modifier "]"))
 524
 525 (defvar dev-glyph-left-matra
 526   (dev-charseq #xca #xd1)
 527   "Devanagari Matras attached at the left side.")
 528
 529 (defvar dev-glyph-top-matra
 530   (dev-charseq #xe0 #xef)
 531   "Devanagari Matras attached at the top side.")
 532
 533 (defvar dev-glyph-bottom-modifier
 534   (append
 535    (dev-charseq #xd6 #xdf)
 536    (dev-charseq #xc2))
 537   "Devanagari Modifiers attached at the bottom.")
 538
 539 (defvar dev-glyph-order
 540   `((,dev-glyph-cvn . 1)
 541     (,dev-glyph-space . 2)
 542     (,dev-glyph-right-modifier . 3)
 543     (,dev-glyph-left-matra . 3) ;; processed by reference point.
 544     (,dev-glyph-top-matra . 4)
 545     (,(dev-charseq #xc7 #xc8) . 5)
 546     (,(dev-charseq #xc4) . 6)
 547     (,(dev-charseq #xc6) . 6)
 548     (,(dev-charseq #xc5) . 7)
 549     (,dev-glyph-bottom-modifier . 8)))
 550
 551 (mapc
 552  (function (lambda (x)
 553    (mapc
 554      (function (lambda (y)
 555        (put-char-code-property y 'composition-order (cdr x))))
 556      (car x))))
 557   dev-glyph-order)
 558
 559 (mapc
 560   (function (lambda (x)
 561     (put-char-code-property x 'reference-point '(3 . 5))))
 562  dev-glyph-left-matra)
 563
 564 (defun devanagari-compose-syllable-string (string)
 565   (with-temp-buffer
 566     (insert (decompose-string string))
 567     (devanagari-compose-syllable-region (point-min) (point-max))
 568     (buffer-string)))
 569
 570 (defun devanagari-compose-syllable-region (from to)
 571   "Compose devanagari syllable in region FROM to TO."
 572   (let ((glyph-str nil) (cons-num 0) glyph-str-list
 573         (last-halant nil) (preceding-r nil) (last-modifier nil)
 574         (last-char (char-before to)) match-str
 575         glyph-block split-pos)
 576     (save-excursion
 577       (save-restriction
 578           ;;; *** char-to-glyph conversion ***
 579         ;; Special rule 1. -- Last halant must be preserved.
 580         (if (eq last-char ?\e$,16-\e(B)
 581             (progn
 582               (setq last-halant t)
 583               (narrow-to-region from (1- to)))
 584           (narrow-to-region from to)
 585           ;; note if the last char is modifier.
 586           (if (or (eq last-char ?\e$,15A\e(B) (eq last-char ?\e$,15B\e(B))
 587               (setq last-modifier t)))
 588         (goto-char (point-min))
 589         ;; Special rule 2. -- preceding "r halant" must be modifier.
 590         (when (looking-at "\e$,15p6-\e(B.")
 591           (setq preceding-r t)
 592           (goto-char (+ 2 (point))))
 593         ;; translate the rest characters into glyphs
 594         (while (re-search-forward dev-char-glyph-regexp nil t)
 595           (setq match-str (match-string 0))
 596           (setq glyph-str
 597                 (concat glyph-str
 598                         (gethash match-str dev-char-glyph-hash)))
 599           ;; count the number of consonant-glyhs.
 600           (if (string-match devanagari-consonant match-str)
 601               (setq cons-num (1+ cons-num))))
 602         ;; preceding-r must be attached before the anuswar if exists.
 603         (if preceding-r
 604             (if last-modifier
 605                 (setq glyph-str (concat (substring glyph-str 0 -1)
 606                                         "\e$,4"'\e(B" (substring glyph-str -1)))
 607               (setq glyph-str (concat glyph-str "\e$,4"'\e(B"))))
 608         (if last-halant (setq glyph-str (concat glyph-str "\e$,4""\e(B")))
 609           ;;; *** glyph-to-glyph conversion ***
 610         (when (string-match dev-glyph-glyph-regexp glyph-str)
 611           (setq glyph-str
 612                 (replace-match (gethash (match-string 0 glyph-str)
 613                                         dev-glyph-glyph-hash)
 614                                nil t glyph-str))
 615           (if (and (> cons-num 1)
 616                    (string-match dev-glyph-glyph-2-regexp glyph-str))
 617               (setq glyph-str
 618                     (replace-match (gethash (match-string 0 glyph-str)
 619                                             dev-glyph-glyph-2-hash)
 620                                    nil t glyph-str))))
 621           ;;; *** glyph reordering ***
 622         (while (setq split-pos (string-match "\e$,4""\e(B\\|.$" glyph-str))
 623           (setq glyph-block (substring glyph-str 0 (1+ split-pos)))
 624           (setq glyph-str (substring glyph-str (1+ split-pos)))
 625           (setq
 626            glyph-block
 627            (if (string-match dev-glyph-right-modifier-regexp glyph-block)
 628                (sort (string-to-list glyph-block)
 629                      (function (lambda (x y)
 630                         (< (get-char-code-property x 'composition-order)
 631                            (get-char-code-property y 'composition-order)))))
 632              (sort (string-to-list glyph-block)
 633                    (function (lambda (x y)
 634                       (let ((xo (get-char-code-property x 'composition-order))
 635                             (yo (get-char-code-property y 'composition-order)))
 636                         (if (= xo 2) nil (if (= yo 2) t (< xo yo)))))))))
 637           (setq glyph-str-list (nconc glyph-str-list glyph-block)))
 638           ;; concatenate and attach reference-points.
 639         (setq glyph-str
 640               (cdr
 641                (apply
 642                 'nconc
 643                 (mapcar
 644                  (function (lambda (x)
 645                    (list
 646                     (or (get-char-code-property x 'reference-point)
 647                     '(5 . 3) ;; default reference point.
 648                      )
 649                     x)))
 650                  glyph-str-list))))))
 651       (compose-region from to glyph-str)))
 652
 653 (provide 'devan-util)
 654
 655 ;;; arch-tag: 9bc4d6e3-f2b9-4110-886e-ff9b66b7eebc
 656 ;;; devan-util.el ends here