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

   1 ;;; knd-util.el --- Support for composing Kannada characters
   2
   3 ;; Copyright (C) 2003, 2004, 2005, 2006, 2007  Free Software Foundation, Inc.
   4
   5 ;; Maintainer:  Maintainer:  CHOWKSEY, Kailash C. <klchxbec@m-net.arbornet.org>
   6 ;; Keywords: multilingual, Kannada
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 2, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  23 ;; Boston, MA 02110-1301, USA.
  24
  25 ;; Created: Jul. 14. 2003
  26
  27 ;;; Commentary:
  28
  29 ;; This file provides character(Unicode) to glyph(CDAC) conversion and
  30 ;; composition of Kannada script characters.
  31
  32 ;;; Code:
  33
  34 ;;;###autoload
  35
  36 ;; Kannada Composable Pattern
  37 ;;    C .. Consonants
  38 ;;    V .. Vowel
  39 ;;    H .. Virama
  40 ;;    M .. Matra
  41 ;;    V .. Vowel
  42 ;;    (N .. Zerowidth Non Joiner)
  43 ;;    (J .. Zerowidth Joiner.  )
  44 ;; 1. vowel
  45 ;;  V(A)?
  46 ;; 2. syllable : maximum of 5 consecutive consonants.  (e.g. kartsnya)
  47 ;;  ((CH)?(CH)?(CH)?CH)?C(H|M?)?
  48
  49 (defconst kannada-consonant
  50   "[\e$,1>u\e(B-\e$,1?9\e(B]")
  51
  52 (defconst kannada-consonant-needs-twirl
  53   "[\e$,1>u>w\e(B-\e$,1>{>}\e(B-\e$,1>~? \e(B-\e$,1?"?$\e(B-\e$,1?+?-?0?3\e(B-\e$,1?9\e(B]\\(\e$,1?M\e(B[\e$,1>u\e(B-\e$,1?9\e(B]\\)*[\e$,1?A?B?C?D>b\e(B]?$")
  54
  55 (defconst kannada-composable-pattern
  56   (concat
  57    "\\([\e$,1>b\e(B-\e$,1>t?`>l\e(B]\\)\\|[\e$,1>c\e(B]"
  58    "\\|\\("
  59    "\\(?:\\(?:[\e$,1>u\e(B-\e$,1?9\e(B]\e$,1?M\e(B\\)?\\(?:[\e$,1>u\e(B-\e$,1?9\e(B]\e$,1?M\e(B\\)?\\(?:[\e$,1>u\e(B-\e$,1?9\e(B]\e$,1?M\e(B\\)?[\e$,1>u\e(B-\e$,1?9\e(B]\e$,1?M\e(B\\)?"
  60    "[\e$,1>u\e(B-\e$,1?9\e(B]\\(?:\e$,1?M\e(B\\|[\e$,1?>\e(B-\e$,1?M?U?C\e(B]?\\)?"
  61    "\\)")
  62   "Regexp matching a composable sequence of Kannada characters.")
  63
  64 ;;;###autoload
  65 (defun kannada-compose-region (from to)
  66   (interactive "r")
  67   (save-excursion
  68     (save-restriction
  69       (narrow-to-region from to)
  70       (goto-char (point-min))
  71       (while (re-search-forward kannada-composable-pattern nil t)
  72         (kannada-compose-syllable-region (match-beginning 0)
  73                                             (match-end 0))))))
  74 ;;;###autoload
  75 (defun kannada-compose-string (string)
  76   (with-temp-buffer
  77     (insert (decompose-string string))
  78     (kannada-compose-region (point-min) (point-max))
  79     (buffer-string)))
  80
  81 ;;;###autoload
  82 (defun kannada-post-read-conversion (len)
  83   (save-excursion
  84     (save-restriction
  85       (let ((buffer-modified-p (buffer-modified-p)))
  86         (narrow-to-region (point) (+ (point) len))
  87         (kannada-compose-region (point-min) (point-max))
  88         (set-buffer-modified-p buffer-modified-p)
  89         (- (point-max) (point-min))))))
  90
  91 (defun kannada-range (from to)
  92   "Make the list of the integers of range FROM to TO."
  93   (let (result)
  94     (while (<= from to) (setq result (cons to result) to (1- to))) result))
  95
  96 (defun kannada-regexp-of-hashtbl-keys (hashtbl)
  97   "Return a regular expression that matches all keys in hashtable HASHTBL."
  98   (let ((max-specpdl-size 1000))
  99     (regexp-opt
 100      (sort
 101       (let (dummy)
 102         (maphash (function (lambda (key val) (setq dummy (cons key dummy)))) hashtbl)
 103         dummy)
 104       (function (lambda (x y) (> (length x) (length y))))))))
 105
 106 (defun kannada-regexp-of-hashtbl-vals (hashtbl)
 107   "Return a regular expression that matches all values in hashtable HASHTBL."
 108   (let ((max-specpdl-size 1000))
 109     (regexp-opt
 110      (sort
 111       (let (dummy)
 112         (maphash (function (lambda (key val) (setq dummy (cons val dummy)))) hashtbl)
 113         dummy)
 114       (function (lambda (x y) (> (length x) (length y))))))))
 115
 116 ;;;###autoload
 117 (defun kannada-composition-function (pos &optional string)
 118   "Compose Kannada characters after the position POS.
 119 If STRING is not nil, it is a string, and POS is an index to the string.
 120 In this case, compose characters after POS of the string."
 121   (if string
 122       ;; Not yet implemented.
 123       nil
 124     (goto-char pos)
 125     (if (looking-at kannada-composable-pattern)
 126         (prog1 (match-end 0)
 127           (kannada-compose-syllable-region pos (match-end 0))))))
 128
 129 ;; Notes on conversion steps.
 130
 131 ;; 1. chars to glyphs
 132 ;;
 133 ;; Rules will not be applied to the virama appeared at the end of the
 134 ;; text.  Also, the preceding/following "r" will be treated as special case.
 135
 136 ;; 2. glyphs reordering.
 137 ;;
 138 ;; The glyphs are split by virama, and each glyph groups are
 139 ;; re-ordered in the following order.
 140 ;;
 141 ;; Note that `consonant-glyph' mentioned here does not contain the
 142 ;; vertical bar (right modifier) attached at the right of the
 143 ;; consonant.
 144 ;;
 145 ;; If the glyph-group contains right modifier,
 146 ;;  (1) consonant-glyphs/vowels
 147 ;;  (2) spacing
 148 ;;  (3) right modifier (may be matra)
 149 ;;  (4) top matra
 150 ;;  (5) preceding "r"
 151 ;;  (7) following "r"
 152 ;;  (8) bottom matra or virama.
 153 ;;
 154 ;; Otherwise,
 155 ;;  (1) consonant-glyph/vowels, with nukta sign
 156 ;;  (3) left matra
 157 ;;  (4) top matra
 158 ;;  (5) preceding "r"
 159 ;;  (7) following "r"
 160 ;;  (8) bottom matra or virama.
 161 ;;  (2) spacing
 162
 163 ;; 3. glyph to glyph
 164 ;;
 165 ;; For better display, some glyph display would be tuned.
 166
 167 ;; 4. Composition.
 168 ;;
 169 ;; left modifiers will be attached at the left.
 170 ;; others will be attached right.
 171
 172 ;; Problem::
 173 ;;  Can we generalize this methods to other Indian scripts?
 174
 175 (defvar knd-char-glyph
 176   '(("\e$,1>e\e(B" . "\e$,43@\e(B")
 177     ("\e$,1>f\e(B" . "\e$,43A\e(B")
 178     ("\e$,1?>\e(B" . "\e$,44{\e(B")
 179     ("\e$,1>g\e(B" . "\e$,43B\e(B")
 180     ("\e$,1??\e(B" . nil)
 181     ("\e$,1>h\e(B" . "\e$,43C\e(B")
 182     ("\e$,1?@\e(B" . nil)
 183     ("\e$,1>i\e(B" . "\e$,43D\e(B")
 184     ("\e$,1?A\e(B" . "\\e$,44\7f\e(B")
 185     ("\e$,1>j\e(B" . "\e$,43E\e(B")
 186     ("\e$,1?B\e(B" . "\\e$,45 \e(B")
 187     ("\e$,1>k\e(B" . "\e$,43F4\7f\e(B")
 188     ("\e$,1?C\e(B" . "\\e$,45$\e(B")
 189     ("\e$,1?`\e(B" . "\e$,43F5 \e(B")
 190     ("\e$,1?D\e(B" . "\\e$,45%\e(B")
 191     ;;("\e$,1>l\e(B" . nil) ; not implemented.
 192     ;;("\e$,1?a\e(B" . nil)
 193     ("\e$,1>n\e(B" . "\e$,43G\e(B")
 194     ("\e$,1>o\e(B" . "\e$,43H\e(B")
 195     ("\e$,1>p\e(B" . "\e$,43I\e(B")
 196     ("\e$,1?F\e(B" . "\\e$,45&\e(B")
 197     ("\e$,1?G\e(B" . "\\e$,45&4~\e(B")
 198     ("\e$,1?H\e(B" . "\\e$,45&5'\e(B")
 199     ("\e$,1>r\e(B" . "\e$,43J\e(B")
 200     ("\e$,1?J\e(B" . "\e$,45&5 \e(B")
 201     ("\e$,1>s\e(B" . "\e$,43K\e(B")
 202     ("\e$,1?K\e(B" . "\\e$,45&5 4~\e(B")
 203     ("\e$,1>t\e(B" . "\e$,43L\e(B")
 204     ("\e$,1?L\e(B" . "\\e$,45(\e(B")
 205     ("\e$,1>b\e(B" . "\e$,43M\e(B")
 206     ("\e$,1>c\e(B" . "\e$,43N\e(B")
 207     ("\e$,1>u?M\e(B" . "\e$,43O5)\e(B") ("\e$,1>u\e(B" . "\e$,43O\e(B") ("\e$,1>u??\e(B" . "\e$,43P\e(B") ("\e$,1>u?@\e(B" . "\e$,43P4~\e(B")
 208     ("\e$,1>v?M\e(B" . "\e$,43S5)\e(B") ("\e$,1>v\e(B" .  "\e$,43S\e(B") ("\e$,1>v??\e(B" . "\e$,43T\e(B") ("\e$,1>v?@\e(B" . "\e$,43T4~\e(B") ("\e$,1>v?F\e(B" . "\e$,43S5&\e(B") ("\e$,1>v?G\e(B" . "\e$,43S5&4~\e(B") ("\e$,1>v?H\e(B" . "\e$,43S5&5'\e(B") ("\e$,1>v?J\e(B" .  "\e$,43S5&5&5 \e(B") ("\e$,1>v?K\e(B" . "\e$,43S5&5&5 4~\e(B") ("\e$,1>v?L\e(B" . "\e$,43S5(\e(B")
 209     ("\e$,1>w?M\e(B" . "\e$,43V5)\e(B") ("\e$,1>w\e(B" . "\e$,43V\e(B") ("\e$,1>w??\e(B" . "\e$,43W\e(B") ("\e$,1>w?@\e(B" . "\e$,43W4~\e(B")
 210     ("\e$,1>x?M\e(B" . "\e$,43Y5)\e(B") ("\e$,1>x\e(B" . "\e$,43Y\e(B") ("\e$,1>x??\e(B" . "\e$,43Z\e(B") ("\e$,1>x?@\e(B" . "\e$,43Z4~\e(B")
 211     ("\e$,1>y?M\e(B" . "\e$,43\5)\e(B") ("\e$,1>y\e(B" . "\e$,43\\e(B")
 212     ("\e$,1>z?M\e(B" . "\e$,43^5)\e(B") ("\e$,1>z\e(B" . "\e$,43^\e(B") ("\e$,1>z??\e(B" . "\e$,43_\e(B") ("\e$,1>z?@\e(B" . "\e$,43_4~\e(B")
 213     ("\e$,1>{?M\e(B" . "\e$,43a5)\e(B") ("\e$,1>{\e(B" . "\e$,43a\e(B") ("\e$,1>{??\e(B" . "\e$,43b\e(B") ("\e$,1>{?@\e(B" . "\e$,43b4~\e(B")
 214     ("\e$,1>|?M\e(B" . "\e$,43d5)\e(B") ("\e$,1>|\e(B" . "\e$,43d\e(B") ("\e$,1>|??\e(B" . "\e$,43f\e(B") ("\e$,1>|?@\e(B" . "\e$,43f4~\e(B") ("\e$,1>|?F\e(B" . "\e$,43e5&\e(B") ("\e$,1>|?G\e(B" . "\e$,43e5&4~\e(B") ("\e$,1>|?H\e(B" . "\e$,43e5&5'\e(B") ("\e$,1>|?J\e(B" .  "\e$,43e5&5&5 \e(B") ("\e$,1>|?K\e(B" . "\e$,43e5&5&5 4~\e(B") ("\e$,1>|?L\e(B" . "\e$,43e5(\e(B")
 215     ("\e$,1>}?M\e(B" . "\e$,44a4z3h4\7f5)\e(B") ("\e$,1>}\e(B" . "\e$,44a4z3h4\7f\e(B") ("\e$,1>}??\e(B" . "\e$,44b3h4\7f\e(B") ("\e$,1>}?@\e(B" . "\e$,44b3h4\7f4~\e(B") ("\e$,1>}?B\e(B". "\e$,44a4z3h5 \e(B") ("\e$,1>}?J\e(B". "\e$,44a5&3h5 \e(B") ("\e$,1>}?K\e(B". "\e$,44a5&3h5 4~\e(B")
 216     ("\e$,1>~?M\e(B" . "\e$,43j5)\e(B") ("\e$,1>~\e(B" . "\e$,43j\e(B")
 217     ("\e$,1>\7f?M\e(B" . "\e$,43m5)\e(B") ("\e$,1>\7f\e(B" . "\e$,43l\e(B") ("\e$,1?#?>\e(B" . "\e$,43m4{\e(B") ("\e$,1>\7f??\e(B" . "\e$,43n\e(B") ("\e$,1>\7f?@\e(B" . "\e$,43n4~\e(B") ("\e$,1>\7f?F\e(B" . "\e$,43m5&\e(B") ("\e$,1>\7f?G\e(B" . "\e$,43m5&4~\e(B") ("\e$,1>\7f?H\e(B" . "\e$,43m5&5'\e(B") ("\e$,1>\7f?J\e(B" .  "\e$,43m5&5&5 \e(B") ("\e$,1>\7f?K\e(B" . "\e$,43m5&5&5 4~\e(B") ("\e$,1>\7f?L\e(B" . "\e$,43m5(\e(B")
 218     ("\e$,1? ?M\e(B" . "\e$,43p5)\e(B") ("\e$,1? \e(B" . "\e$,43p\e(B") ("\e$,1? ??\e(B" . "\e$,43q\e(B") ("\e$,1? ?@\e(B" . "\e$,43q4~\e(B")
 219     ("\e$,1?!?M\e(B" . "\e$,43s5)\e(B") ("\e$,1?!\e(B" . "\e$,43s\e(B") ("\e$,1?!??\e(B" . "\e$,43t\e(B") ("\e$,1?!?@\e(B" . "\e$,43t4~\e(B")
 220     ("\e$,1?"?M\e(B" . "\e$,43v5)\e(B") ("\e$,1?"\e(B" . "\e$,43v\e(B") ("\e$,1?"??\e(B" . "\e$,43w\e(B") ("\e$,1?"?@\e(B" . "\e$,43w4~\e(B")
 221     ("\e$,1?#?M\e(B" . "\e$,43z5)\e(B") ("\e$,1?#\e(B" . "\e$,43y\e(B") ("\e$,1?#?>\e(B" . "\e$,43z4{\e(B") ("\e$,1?#??\e(B" . "\e$,43{\e(B") ("\e$,1?#?@\e(B" . "\e$,43{4~\e(B") ("\e$,1?#?F\e(B" . "\e$,43z5&\e(B") ("\e$,1?#?G\e(B" . "\e$,43z5&4~\e(B") ("\e$,1?#?H\e(B" . "\e$,43z5&5'\e(B") ("\e$,1?#?J\e(B" .  "\e$,43z5&5&5 \e(B") ("\e$,1?#?K\e(B" . "\e$,43z5&5&5 4~\e(B") ("\e$,1?#?L\e(B" . "\e$,43z5(\e(B")
 222     ("\e$,1?$?M\e(B" . "\e$,43}5)\e(B") ("\e$,1?$\e(B" . "\e$,43}\e(B") ("\e$,1?$??\e(B" . "\e$,43~\e(B") ("\e$,1?$?@\e(B" . "\e$,43~4~\e(B")
 223     ("\e$,1?%?M\e(B" . "\e$,44B5)\e(B") ("\e$,1?%\e(B" . "\e$,44B\e(B") ("\e$,1?%??\e(B" . "\e$,44C\e(B") ("\e$,1?%?@\e(B" . "\e$,44C4~\e(B")
 224     ("\e$,1?&?M\e(B" . "\e$,44E5)\e(B") ("\e$,1?&\e(B" . "\e$,44E\e(B") ("\e$,1?&??\e(B" . "\e$,44F\e(B") ("\e$,1?&?@\e(B" . "\e$,44F4~\e(B")
 225     ("\e$,1?'?M\e(B" . "\e$,44H5)\e(B") ("\e$,1?'\e(B" . "\e$,44H\e(B") ("\e$,1?'??\e(B" . "\e$,44I\e(B") ("\e$,1?'?@\e(B" . "\e$,44I4~\e(B")
 226     ("\e$,1?(?M\e(B" . "\e$,44K5)\e(B") ("\e$,1?(\e(B" . "\e$,44K\e(B") ("\e$,1?(??\e(B" . "\e$,44L\e(B") ("\e$,1?(?@\e(B" . "\e$,44L4~\e(B")
 227     ("\e$,1?*?M\e(B" . "\e$,44N5)\e(B") ("\e$,1?*\e(B" . "\e$,44N\e(B") ("\e$,1?*??\e(B" . "\e$,44O\e(B") ("\e$,1?*?@\e(B" . "\e$,44O4~\e(B") ("\e$,1?*?A\e(B" . "\e$,44N5"\e(B") ("\e$,1?*?B\e(B" . "\e$,44N5#\e(B") ("\e$,1?*?J\e(B" . "\e$,44N5&5#\e(B") ("\e$,1?*?K\e(B" . "\e$,44N5&5#4~\e(B")
 228     ("\e$,1?+?M\e(B" . "\e$,44Q5)\e(B") ("\e$,1?+\e(B" . "\e$,44Q\e(B") ("\e$,1?+??\e(B" . "\e$,44R\e(B") ("\e$,1?+?@\e(B" . "\e$,44R4~\e(B") ("\e$,1?+?A\e(B" . "\e$,44Q5"\e(B") ("\e$,1?+?B\e(B" . "\e$,44Q5#\e(B") ("\e$,1?+?J\e(B" . "\e$,44Q5&5#\e(B") ("\e$,1?+?K\e(B" . "\e$,44Q5&5#4~\e(B")
 229     ("\e$,1?,?M\e(B" . "\e$,44W5)\e(B") ("\e$,1?,\e(B" . "\e$,44V\e(B") ("\e$,1?,?>\e(B". "\e$,44W4{\e(B") ("\e$,1?,??\e(B" . "\e$,44X\e(B") ("\e$,1?,?@\e(B" . "\e$,44X4~\e(B") ("\e$,1?,?F\e(B" . "\e$,44W5&\e(B") ("\e$,1?,?G\e(B" . "\e$,44W5&4~\e(B") ("\e$,1?,?H\e(B" . "\e$,44W5&5'\e(B") ("\e$,1?,?J\e(B" .  "\e$,44W5&5&5 \e(B") ("\e$,1?,?K\e(B" . "\e$,44W5&5&5 4~\e(B") ("\e$,1?,?L\e(B" . "\e$,44W5(\e(B")
 230     ("\e$,1?-?M\e(B" . "\e$,44Z5)\e(B") ("\e$,1?-\e(B" . "\e$,44Z\e(B") ("\e$,1?-??\e(B" . "\e$,44[\e(B") ("\e$,1?-?@\e(B" . "\e$,44[4~\e(B")
 231     ("\e$,1?.?M\e(B" . "\e$,44h5!5)\e(B") ("\e$,1?.\e(B" . "\e$,44h4z4\7f\e(B") ("\e$,1?.?>\e(B" . "\e$,44h4z5!4{\e(B") ("\e$,1?.??\e(B" . "\e$,44i4\7f\e(B") ("\e$,1?.?@\e(B" . "\e$,44i4\7f4~\e(B") ("\e$,1?.?J\e(B". "\e$,44h5&5 \e(B") ("\e$,1?.?K\e(B". "\e$,44h5&5 4~\e(B")
 232     ("\e$,1?/?M\e(B" . "\e$,44^4z5!5)\e(B") ("\e$,1?/\e(B" . "\e$,44^4z4\7f\e(B") ("\e$,1?/?>\e(B" . "\e$,44^4z5!4{\e(B")("\e$,1?/??\e(B" . "\e$,44_4\7f\e(B") ("\e$,1?/?@\e(B" . "\e$,44_4\7f4~\e(B") ("\e$,1?/?J\e(B" . "\e$,44^5&5 \e(B") ("\e$,1?/?K\e(B" . "\e$,44^5&5 4~\e(B")
 233     ("\e$,1?0?M\e(B" . "\e$,44a5)\e(B") ("\e$,1?0\e(B" . "\e$,44a\e(B") ("\e$,1?0??\e(B" . "\e$,44b\e(B") ("\e$,1?0?@\e(B" . "\e$,44b4~\e(B")
 234     ("\e$,1?0?M\e(B" . "\e$,44a5)\e(B") ("\e$,1?0\e(B" . "\e$,44a\e(B") ("\e$,1?0??\e(B" . "\e$,44b\e(B") ("\e$,1?0?@\e(B" . "\e$,44b4~\e(B")
 235     ("\e$,1?2?M\e(B" . "\e$,44e5)\e(B") ("\e$,1?2\e(B" . "\e$,44d\e(B") ("\e$,1?2?>\e(B" . "\e$,44e4{\e(B") ("\e$,1?2??\e(B" . "\e$,44f\e(B") ("\e$,1?2?@\e(B" . "\e$,44f4~\e(B") ("\e$,1?2?F\e(B" . "\e$,44e5&\e(B") ("\e$,1?2?G\e(B" . "\e$,44e5&4~\e(B") ("\e$,1?2?H\e(B" . "\e$,44e5&5'\e(B") ("\e$,1?2?J\e(B" .  "\e$,44e5&5&5 \e(B") ("\e$,1?2?K\e(B" . "\e$,44e5&5&5 4~\e(B") ("\e$,1?2?L\e(B" . "\e$,44e5(\e(B")
 236     ("\e$,1?5?M\e(B" . "\e$,44h5)\e(B") ("\e$,1?5\e(B" . "\e$,44h\e(B") ("\e$,1?5??\e(B" . "\e$,44i\e(B") ("\e$,1?5?@\e(B" . "\e$,44i4~\e(B") ("\e$,1?5?A\e(B" . "\e$,44h5"\e(B") ("\e$,1?5?B\e(B" . "\e$,44h5#\e(B") ("\e$,1?5?J\e(B" . "\e$,44h5&5#\e(B") ("\e$,1?5?K\e(B" . "\e$,44h5&5#4~\e(B")
 237     ("\e$,1?6?M\e(B" . "\e$,44k5)\e(B") ("\e$,1?6\e(B" . "\e$,44k\e(B") ("\e$,1?6??\e(B" . "\e$,44l\e(B") ("\e$,1?6?@\e(B" . "\e$,44l4~\e(B")
 238     ("\e$,1?7?M\e(B" . "\e$,44n5)\e(B") ("\e$,1?7\e(B" . "\e$,44n\e(B") ("\e$,1?7??\e(B" . "\e$,44o\e(B") ("\e$,1?7?@\e(B" . "\e$,44o4~\e(B")
 239     ("\e$,1?8?M\e(B" . "\e$,44q5)\e(B") ("\e$,1?8\e(B" . "\e$,44q\e(B") ("\e$,1?8??\e(B" . "\e$,44r\e(B") ("\e$,1?8?@\e(B" . "\e$,44r4~\e(B")
 240     ("\e$,1?9?M\e(B" . "\e$,44t5)\e(B") ("\e$,1?9\e(B" . "\e$,44t\e(B") ("\e$,1?9??\e(B" . "\e$,44u\e(B") ("\e$,1?9?@\e(B" . "\e$,44u4~\e(B")
 241     ("\e$,1?3?M\e(B" . "\e$,44w5)\e(B") ("\e$,1?3\e(B" . "\e$,44w\e(B") ("\e$,1?3??\e(B" . "\e$,44x\e(B") ("\e$,1?3?@\e(B" . "\e$,44x4~\e(B"))
 242 "Kannada characters to glyphs conversion table.
 243 Default value contains only the basic rules.")
 244
 245 (defvar knd-char-glyph-hash
 246   (let* ((hash (make-hash-table :test 'equal)))
 247     (mapc (function (lambda (x) (puthash (car x) (cdr x) hash)))
 248           knd-char-glyph)
 249     hash))
 250
 251 (defvar knd-char-glyph-regexp
 252   (kannada-regexp-of-hashtbl-keys knd-char-glyph-hash))
 253
 254 (defvar knd-conjunct-glyph
 255   '(("\e$,1>u\e(B" . "\e$,43Q\e(B") ("\e$,1>v\e(B" . "\e$,43U\e(B") ("\e$,1>w\e(B" . "\e$,43X\e(B") ("\e$,1>x\e(B" . "\e$,43[\e(B") ("\e$,1>y\e(B" . "\e$,43]\e(B")
 256     ("\e$,1>z\e(B" . "\e$,43`\e(B") ("\e$,1>{\e(B" . "\e$,43c\e(B") ("\e$,1>|\e(B" . "\e$,43g\e(B") ("\e$,1>}\e(B" . "\e$,43i\e(B") ("\e$,1>~\e(B" . "\e$,43k\e(B")
 257     ("\e$,1>\7f\e(B" . "\e$,43o\e(B") ("\e$,1? \e(B" . "\e$,43r\e(B") ("\e$,1?!\e(B" . "\e$,43u\e(B") ("\e$,1?"\e(B" . "\e$,43x\e(B") ("\e$,1?#\e(B" . "\e$,43|\e(B")
 258     ("\e$,1?$\e(B" . "\e$,44A\e(B") ("\e$,1?%\e(B" . "\e$,44D\e(B") ("\e$,1?&\e(B" . "\e$,44G\e(B") ("\e$,1?'\e(B" . "\e$,44J\e(B") ("\e$,1?(\e(B" . "\e$,44M\e(B")
 259     ("\e$,1?*\e(B" . "\e$,44P\e(B") ("\e$,1?+\e(B" . "\e$,44U\e(B") ("\e$,1?,\e(B" . "\e$,44Y\e(B") ("\e$,1?-\e(B" . "\e$,44\\e(B") ("\e$,1?.\e(B" . "\e$,44]\e(B")
 260     ("\e$,1?/\e(B" . "\e$,44`\e(B") ("\e$,1?0\e(B" . "\e$,44c\e(B") ("\e$,1?2\e(B" . "\e$,44g\e(B") ("\e$,1?3\e(B" . "\e$,44y\e(B") ("\e$,1?5\e(B" . "\e$,44j\e(B")
 261     ("\e$,1?6\e(B" . "\e$,44m\e(B") ("\e$,1?7\e(B" . "\e$,44p\e(B") ("\e$,1?8\e(B" . "\e$,44s\e(B") ("\e$,1?9\e(B" . "\e$,44v\e(B"))
 262 "Kannada characters to conjunct glyphs conversion table.")
 263
 264 (defvar knd-conjunct-glyph-hash
 265   (let* ((hash (make-hash-table :test 'equal)))
 266     (mapc (function (lambda (x) (puthash (car x) (cdr x) hash)))
 267           knd-conjunct-glyph)
 268     hash))
 269
 270 (defvar knd-conjunct-glyph-regexp
 271   (kannada-regexp-of-hashtbl-vals knd-conjunct-glyph-hash))
 272
 273 (mapc
 274   (function (lambda (x)
 275     (put-char-code-property (aref (cdr x) 0) 'reference-point '(5 . 3))))
 276   knd-conjunct-glyph)
 277
 278 ;; glyph-to-glyph conversion table.
 279 ;; it is supposed that glyphs are ordered in
 280 ;;   [consonant/nukta] - [matra/virama] - [preceding-r] - [anuswar].
 281
 282 (defvar knd-glyph-glyph
 283   '(("\e$,45$4A\e(B" . "\e$,45*\e(B")
 284     ("\e$,45'4A\e(B" . "\e$,45+\e(B")
 285     ("\e$,44A3g\e(B" . "\e$,45,\e(B")
 286     ("\e$,45$3Q\e(B" . "\e$,45-\e(B")))
 287
 288 (defvar knd-glyph-glyph-hash
 289   (let* ((hash (make-hash-table :test 'equal)))
 290     (mapc (function (lambda (x) (puthash (car x) (cdr x) hash)))
 291           knd-glyph-glyph)
 292     hash))
 293 (defvar knd-glyph-glyph-regexp
 294   (kannada-regexp-of-hashtbl-keys knd-glyph-glyph-hash))
 295
 296 (defun knd-charseq (from &optional to)
 297   (if (null to) (setq to from))
 298   (number-sequence (decode-char 'kannada-cdac from)
 299                    (decode-char 'kannada-cdac to)))
 300
 301 (defvar knd-glyph-cv
 302   (append
 303    (knd-charseq #x40 #x50)
 304    (knd-charseq #x52 #x54)
 305    (knd-charseq #x56 #x57)
 306    (knd-charseq #x59 #x5a)
 307    (knd-charseq #x5c)
 308    (knd-charseq #x5e #x5f)
 309    (knd-charseq #x61 #x62)
 310    (knd-charseq #x64 #x66)
 311    (knd-charseq #x6a)
 312    (knd-charseq #x6c #x6e)
 313    (knd-charseq #x70 #x71)
 314    (knd-charseq #x73 #x74)
 315    (knd-charseq #x76 #x77)
 316    (knd-charseq #x79 #x7b)
 317    (knd-charseq #x7d #x7e)
 318    (knd-charseq #xa2 #xa3)
 319    (knd-charseq #xa5 #xa6)
 320    (knd-charseq #xa8 #xa9)
 321    (knd-charseq #xab #xac)
 322    (knd-charseq #xae #xaf)
 323    (knd-charseq #xb1 #xb2)
 324    (knd-charseq #xb6 #xb8)
 325    (knd-charseq #xb6 #xb8)
 326    (knd-charseq #xba #xbb)
 327    (knd-charseq #xbe #xbf)
 328    (knd-charseq #xc1 #xc2)
 329    (knd-charseq #xc4 #xc6)
 330    (knd-charseq #xc8 #xc9)
 331    (knd-charseq #xcb #xcc)
 332    (knd-charseq #xce #xcf)
 333    (knd-charseq #xd1 #xd2)
 334    (knd-charseq #xd4 #xd5)
 335    (knd-charseq #xd7 #xd8)
 336    (knd-charseq #xc3))
 337   "Kannada Consonants/Vowels/Nukta Glyphs")
 338
 339 (defvar knd-glyph-space
 340   (knd-charseq #xb3 #xb4)
 341   "Kannada Spacing Glyphs")
 342
 343 (defvar knd-glyph-right-modifier
 344   (append
 345    (knd-charseq #xdb #xdd)
 346    (knd-charseq #xdf)
 347    (knd-charseq #xe0 #xe3)
 348    (knd-charseq #xe9))
 349   "Kannada Modifiers attached at the right side.")
 350
 351 (defvar knd-glyph-right-modifier-regexp
 352   (concat "[" knd-glyph-right-modifier "]"))
 353
 354 (defvar knd-glyph-jha-tail
 355    (knd-charseq #x68)
 356   "Kannada tail for jha.")
 357
 358 (defvar knd-glyph-top-matra
 359   (append
 360    (knd-charseq #xda)
 361    (knd-charseq #xdd)
 362    (knd-charseq #xe6)
 363    (knd-charseq #xe8))
 364   "Kannada Matras attached at the top side.")
 365
 366 (defvar knd-glyph-bottom-matra
 367   (append
 368    (knd-charseq #xe4 #xe5)
 369    (knd-charseq #xe7))
 370   "Kannada Matras attached at the bottom.")
 371
 372 (defvar knd-glyph-end-marks
 373   (append
 374    (knd-charseq #x25)
 375    (knd-charseq #x4d #x4e)
 376    (knd-charseq #xde))
 377   "Kannada end marks: arkavattu, virama, au and diirghaa.")
 378
 379 (defvar knd-glyph-bottom-modifier
 380   (append
 381    (knd-charseq #x51)
 382    (knd-charseq #x55)
 383    (knd-charseq #x58)
 384    (knd-charseq #x5b)
 385    (knd-charseq #x5d)
 386    (knd-charseq #x60)
 387    (knd-charseq #x63)
 388    (knd-charseq #x67)
 389    (knd-charseq #x69)
 390    (knd-charseq #x6b)
 391    (knd-charseq #x6f)
 392    (knd-charseq #x72)
 393    (knd-charseq #x75)
 394    (knd-charseq #x78)
 395    (knd-charseq #x7c)
 396    (knd-charseq #xa1)
 397    (knd-charseq #xa4)
 398    (knd-charseq #xa7)
 399    (knd-charseq #xaa)
 400    (knd-charseq #xad)
 401    (knd-charseq #xb0)
 402    (knd-charseq #xb5)
 403    (knd-charseq #xb9)
 404    (knd-charseq #xbc #xbd)
 405    (knd-charseq #xc0)
 406    (knd-charseq #xc3)
 407    (knd-charseq #xc7)
 408    (knd-charseq #xca)
 409    (knd-charseq #xcd)
 410    (knd-charseq #xd0)
 411    (knd-charseq #xd3)
 412    (knd-charseq #xd6)
 413    (knd-charseq #xd9)
 414    (knd-charseq #xea #xef))
 415   "Kannada Modifiers attached at the bottom.")
 416
 417 (defvar knd-glyph-order
 418   `((,knd-glyph-cv . 1)
 419     (,knd-glyph-top-matra . 2)
 420     (,knd-glyph-jha-tail . 3)
 421     (,knd-glyph-right-modifier . 4)
 422     (,knd-glyph-space . 5)
 423     (,knd-glyph-bottom-modifier . 5)
 424     (,knd-glyph-bottom-matra . 6)
 425     (,knd-glyph-end-marks . 7)
 426     ))
 427
 428 (mapc
 429  (function (lambda (x)
 430    (mapc
 431      (function (lambda (y)
 432        (put-char-code-property y 'composition-order (cdr x))))
 433      (car x))))
 434   knd-glyph-order)
 435
 436 (defun kannada-compose-syllable-string (string)
 437   (with-temp-buffer
 438     (insert (decompose-string string))
 439     (kannada-compose-syllable-region (point-min) (point-max))
 440     (buffer-string)))
 441
 442 ;; kch
 443 (defun kannada-compose-syllable-region (from to)
 444   "Compose kannada syllable in region FROM to TO."
 445   (let ((glyph-str nil) (cons-num 0) (glyph-str-list nil)
 446         (last-virama nil) (preceding-r nil) (last-modifier nil)
 447         (last-char (char-before to)) match-str pos
 448         glyph-block split-pos (conj nil) (rest nil))
 449     (save-excursion
 450       (save-restriction
 451           ;;; *** char-to-glyph conversion ***
 452         ;; Special rule 1. -- Last virama must be preserved.
 453         (if (eq last-char ?\e$,1?M\e(B)
 454             (progn
 455               (setq last-virama t)
 456               (narrow-to-region from (1- to)))
 457           (narrow-to-region from to))
 458         (goto-char (point-min))
 459         ;; Special rule 2. -- preceding "r virama" must be modifier.
 460         (when (looking-at "\e$,1?0?M\e(B.")
 461           (setq preceding-r t)
 462           (goto-char (+ 2 (point))))
 463         ;; remove conjunct consonants
 464         (while (re-search-forward knd-char-glyph-regexp nil t)
 465           (setq match-str (match-string 0))
 466           (if (and (string-match kannada-consonant match-str)
 467                    (> cons-num 0))
 468               (progn
 469                 (setq conj (concat conj (gethash (match-string 0 match-str)
 470                                                  knd-conjunct-glyph-hash)))
 471                 (setq match-str (replace-match "" t nil match-str))
 472                 (if (string-match "\e$,1?M\e(B" rest)
 473                     (setq rest (replace-match "" t nil rest)))))
 474           (setq rest (concat rest match-str))
 475           ;; count the number of consonant-glyhs.
 476           (if (string-match kannada-consonant match-str)
 477               (setq cons-num (1+ cons-num))))
 478         ;; translate the rest characters into glyphs
 479         (setq pos 0)
 480         (while (string-match knd-char-glyph-regexp rest pos)
 481           (setq match-str (match-string 0 rest))
 482           (setq pos (match-end 0))
 483           (setq glyph-str
 484                 (concat glyph-str (gethash match-str knd-char-glyph-hash))))
 485
 486         (if conj (setq glyph-str (concat glyph-str conj)))
 487         (if last-virama (setq glyph-str (concat glyph-str "\e$,45)\e(B"))
 488           (goto-char (point-min))
 489           (if (re-search-forward kannada-consonant-needs-twirl nil t)
 490               (progn
 491                 (setq match-str (match-string 0))
 492                 (setq glyph-str (concat glyph-str "\e$,44z\e(B")))))
 493         ;; preceding-r must be attached
 494         (if preceding-r
 495               (setq glyph-str (concat glyph-str "\e$,43%\e(B")))
 496           ;;; *** glyph-to-glyph conversion ***
 497         (when (string-match knd-glyph-glyph-regexp glyph-str)
 498           (setq glyph-str
 499                 (replace-match (gethash (match-string 0 glyph-str)
 500                                         knd-glyph-glyph-hash)
 501                                nil t glyph-str)))
 502           ;;; *** glyph reordering ***
 503         (while (setq split-pos (string-match "\e$,45)\e(B\\|.$" glyph-str))
 504           (setq glyph-block (substring glyph-str 0 (1+ split-pos)))
 505           (setq glyph-str (substring glyph-str (1+ split-pos)))
 506           (setq
 507            glyph-block
 508                (sort (string-to-list glyph-block)
 509                      (function (lambda (x y)
 510                         (< (get-char-code-property x 'composition-order)
 511                            (get-char-code-property y 'composition-order))))))
 512           (setq glyph-str-list (nconc glyph-str-list glyph-block)))
 513           ;;; *** insert space glyphs for kerning ***
 514         (if (> cons-num 0)
 515             (let ((curr glyph-str-list) (prev nil) (last-bott nil) bott co)
 516               (while curr
 517                 (setq co (get-char-code-property
 518                                 (car curr) 'composition-order)
 519                       bott (or (eq co 5) (eq co 6)))
 520                 (if (and bott last-bott)
 521                     (setcdr prev (cons ?\e$,44T\e(B curr)))
 522                 (setq last-bott bott prev curr curr (cdr curr)))))
 523           ;; concatenate and attach reference-points.
 524         (setq glyph-str
 525               (cdr
 526                (apply
 527                 'nconc
 528                 (mapcar
 529                  (function (lambda (x)
 530                    (list
 531                     (or (get-char-code-property x 'reference-point)
 532                     '(5 . 3) ;; default reference point.
 533                      )
 534                     x)))
 535                  glyph-str-list))))))
 536       (compose-region from to glyph-str)))
 537
 538 (provide 'knd-util)
 539
 540 ;;; arch-tag: 78d32230-a960-46a5-b622-61ed6ffcf8fc
 541 ;;; knd-util.el ends here