mlm-util.el 13.2 KB
Newer Older
Kenichi Handa's avatar
Kenichi Handa committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159
;;; mlm-util.el --- support for composing malayalam characters  -*-coding: iso-2022-7bit;-*-

;; Copyright (C) 2003 Free Software Foundation, Inc.

;; Maintainer:  KAWABATA, Taichi <kawabata@m17n.org>
;; Keywords: multilingual, Malayalam

;; 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 2, 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; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;; Created: Feb. 11. 2003

;;; Commentary:

;; This file provides character(Unicode) to glyph(CDAC) conversion and
;; composition of Malayalam script characters.

;;; Code:

;; Malayalam Composable Pattern
;;    C .. Consonants
;;    V .. Vowel
;;    H .. Halant
;;    M .. Matra
;;    V .. Vowel
;;    A .. Anuswar
;;    D .. Chandrabindu
;;    (N .. Zerowidth Non Joiner)
;;    (J .. Zerowidth Joiner.  )
;; 1. vowel
;;  V(A|visargam)?
;; 2. syllable : maximum of 5 consecutive consonants.  (e.g. kartsnya)
;;  ((CH)?(CH)?(CH)?CH)?C(H|M?(A|D)?)?

(defconst malayalam-consonant
  "[$,1@5(B-$,1@Y(B]")

(defconst malayalam-composable-pattern
  (concat
   "\\([$,1@%(B-$,1@4(B][$,1@"(B]?\\)\\|$,1@#(B"
   "\\|\\("
   "\\(?:\\(?:[$,1@5(B-$,1@Y(B]$,1@m(B\\)?\\(?:[$,1@5(B-$,1@Y(B]$,1@m(B\\)?\\(?:[$,1@5(B-$,1@Y(B]$,1@m(B\\)?[$,1@5(B-$,1@Y(B]$,1@m(B\\)?"
   "[$,1@5(B-$,1@Y(B]\\(?:$,1@m(B\\|[$,1@^(B-$,1@c@f@g@h@j@j@k@l(B]?[$,1@"@m(B]?\\)?"
   "\\)")
  "Regexp matching a composable sequence of Malayalam characters.")

;;;###autoload
(defun malayalam-compose-region (from to)
  (interactive "r")
  (save-excursion
    (save-restriction
      (narrow-to-region from to)
      (goto-char (point-min))
      (while (re-search-forward malayalam-composable-pattern nil t)
	(malayalam-compose-syllable-region (match-beginning 0)
					    (match-end 0))))))
(defun malayalam-compose-string (string)
  (with-temp-buffer
    (insert (decompose-string string))
    (malayalam-compose-region (point-min) (point-max))
    (buffer-string)))

(defun malayalam-post-read-conversion (len)
  (save-excursion
    (save-restriction
      (let ((buffer-modified-p (buffer-modified-p)))
	(narrow-to-region (point) (+ (point) len))
	(malayalam-compose-region (point-min) (point-max))
	(set-buffer-modified-p buffer-modified-p)
	(- (point-max) (point-min))))))

(defun malayalam-range (from to)
  "Make the list of the integers of range FROM to TO."
  (let (result)
    (while (<= from to) (setq result (cons to result) to (1- to))) result))

(defun malayalam-regexp-of-hashtbl-keys (hashtbl)
  "Return a regular expression that matches all keys in hashtable HASHTBL."
  (let ((max-specpdl-size 1000))
    (regexp-opt
     (sort
      (let (dummy)
	(maphash (function (lambda (key val) (setq dummy (cons key dummy)))) hashtbl)
	dummy)
      (function (lambda (x y) (> (length x) (length y))))))))


;;;###autoload
(defun malayalam-composition-function (from to pattern  &optional string)
  "Compose Malayalam characters in REGION, or STRING if specified.
Assume that the REGION or STRING must fully match the composable 
PATTERN regexp."
  (if string (malayalam-compose-syllable-string string)
    (malayalam-compose-syllable-region from to))
  (- to from))

;; Register a function to compose Malayalam characters.
(mapc
 (function (lambda (ucs)
   (aset composition-function-table (decode-char 'ucs ucs)
	 (list (cons malayalam-composable-pattern
                     'malayalam-composition-function)))))
 (nconc '(#x0d02 #x0d03) (malayalam-range #x0d05 #x0d39)))

;; Notes on conversion steps.

;; 1. chars to glyphs
;;
;; Simple replacement of characters to glyphs is done.

;; 2. glyphs reordering.
;;
;; Two special reordering rule takes place.
;; a. following "$,46[(B" goes to the front.
;; b. following "$,46S6S(B", "$,46S(B" or "$,46T(B" goes to the front.
;; This reordering occurs only to the last cluster of consonants.
;; Preceding consonants with halant characters are not affected.

;; 3. Composition.
;;
;; left modifiers will be attached at the left.
;; others will be attached right.

(defvar mlm-char-glyph
  '(;; various signs
    ("$,1@"(B" . "$,46W(B")
    ("$,1@#(B" . "$,46X(B")
    ;; Independent Vowels
    ("$,1@%(B" . "$,46!(B")
    ("$,1@&(B" . "$,46"(B")
    ("$,1@'(B" . "$,46#(B")
    ("$,1@((B" . "$,46#6U(B")
    ("$,1@)(B" . "$,46$(B")
    ("$,1@*(B" . "$,46$6U(B")
    ("$,1@+(B" . "$,46%(B")
    ("$,1@,(B" . "nil") ;; not in present use, not supported.
    ("$,1@.(B" . "$,46&(B")
    ("$,1@/(B" . "$,46'(B")
    ("$,1@0(B" . "$,46S6&(B")
    ("$,1@2(B" . "$,46((B")
    ("$,1@3(B" . "$,46(6M(B")
    ("$,1@4(B" . "$,46(6U(B")
    ;; Consonants
    ("$,1@5(B" . "$,46)(B")
    ("$,1@5@m@5(B" . "$,47!(B")
160
    ("$,1@5@m@S(B" . "$,47"(B")
Kenichi Handa's avatar
Kenichi Handa committed
161 162 163
    ("$,1@5@m@W(B" . "$,47#(B")
    ("$,1@5@m@?(B" . "$,47N(B") ;; ?
    ("$,1@5@m@D(B" . "$,47`(B")
164 165
    ("$,1@5@a(B" . "$,47f(B") ;; ? ;; vowel u?
    ("$,1@5@m@5@m@a(B" . "$,47g(B") ;; ? ;; vowel u?
Kenichi Handa's avatar
Kenichi Handa committed
166 167 168 169 170 171 172 173 174 175 176 177 178 179

    ("$,1@6(B" . "$,46*(B")

    ("$,1@7(B" . "$,46+(B")
    ("$,1@7@m@7(B" . "$,47$(B")
    ("$,1@7@m@R(B" . "$,47%(B")
    ("$,1@7@m@N(B" . "$,47\(B")
    ("$,1@7@m@H(B" . "$,47a(B")

    ("$,1@8(B" . "$,46,(B")

    ("$,1@9(B" . "$,46-(B")
    ("$,1@9@m@5(B" . "$,47&(B")
    ("$,1@9@m@9(B" . "$,47'(B")
180
    ("$,1@9@m@5@a(B" . "$,47h(B") ;; ? ;; vowel u?
Kenichi Handa's avatar
Kenichi Handa committed
181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219

    ("$,1@:(B" . "$,46.(B")
    ("$,1@:@m@:(B" . "$,47((B") ;; duplicate
    ("$,1@:@m@;(B" . "$,47Q(B") ;; ?

    ("$,1@;(B" . "$,46/(B")

    ("$,1@<(B" . "$,460(B")
    ("$,1@<@m@<(B" . "$,47V(B")
    ("$,1@<@m@>(B" . "$,47Z(B")

    ("$,1@=(B" . "$,461(B")

    ("$,1@>(B" . "$,462(B")
    ("$,1@>@m@:(B" . "$,47)(B")
    ("$,1@>@m@>(B" . "$,47*(B")

    ("$,1@?(B" . "$,463(B")
    ("$,1@?@m@?(B" . "$,47+(B")

    ("$,1@@(B" . "$,464(B")
    ("$,1@A(B" . "$,465(B")
    ("$,1@A@m@A(B" . "$,47M(B")
    ("$,1@B(B" . "$,466(B")

    ("$,1@C(B" . "$,467(B")
    ("$,1@C@m(B" . "$,47,(B") ;; half consonant
    ("$,1@C@m@?(B" . "$,47-(B")
    ("$,1@C@m@C(B" . "$,47.(B")
    ("$,1@C@m@N(B" . "$,47W(B")
    ("$,1@C@m@G(B" . "$,47^(B") ;; ?
    ("$,1@C@m@V(B" . "$,47i(B") ;; ?

    ("$,1@D(B" . "$,468(B")
    ("$,1@D@m@D(B" . "$,47/(B")
    ("$,1@D@m@E(B" . "$,470(B")
    ("$,1@D@m@X(B" . "$,47U(B")
    ("$,1@D@m@M(B" . "$,47[(B")
    ("$,1@D@m@N(B" . "$,47_(B")
220
    ("$,1@D@a(B" . "$,47j(B") ;; ? ;; vowel u ?
Kenichi Handa's avatar
Kenichi Handa committed
221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326

    ("$,1@E(B" . "$,469(B")

    ("$,1@F(B" . "$,46:(B")
    ("$,1@F@m@F(B" . "$,471(B")
    ("$,1@F@m@G(B" . "$,472(B")

    ("$,1@G(B" . "$,46;(B")

    ("$,1@H(B" . "$,46<(B")
    ("$,1@H@m(B" . "$,473(B") ;; half consonant
    ("$,1@H@m@D(B" . "$,474(B")
    ("$,1@H@m@F(B" . "$,475(B")
    ("$,1@H@m@H(B" . "$,476(B")
    ("$,1@H@m@N(B" . "$,477(B")
    ("$,1@H@m@G(B" . "$,47T(B")
    ("$,1@H@m@E(B" . "$,47Y(B")
    ("$,1@H@m@Q(B" . "$,47b(B")
    ("$,1@H@m@V(B" . "$,47k(B") ;; ?
    ("$,1@H@m@H@m@V(B" . "$,47l(B") ;; ?

    ("$,1@J(B" . "$,46=(B")
    ("$,1@J@m@J(B" . "$,478(B") ;; duplicate
    ("$,1@J@m@R(B" . "$,479(B") ;; lakar

    ("$,1@K(B" . "$,46>(B")

    ("$,1@L(B" . "$,46?(B")
    ("$,1@L@m@L(B" . "$,47:(B") ;; duplicate
    ("$,1@L@m@R(B" . "$,47;(B") ;; lakar
    ("$,1@L@m@G(B" . "$,47O(B") ;; ?
    ("$,1@L@m@F(B" . "$,47P(B") ;; ?

    ("$,1@M(B" . "$,46@(B")

    ("$,1@N(B" . "$,46A(B")
    ("$,1@N@m@J(B" . "$,47<(B")
    ("$,1@N@m@N(B" . "$,47=(B")
    ("$,1@N@m@R(B" . "$,47>(B") ;; lakar

    ("$,1@O(B" . "$,46B(B")
    ("$,1@O@m@O(B" . "$,47?(B") ;; duplicate
    ("$,1@O@m@5@m@5(B" . "$,47m(B") ;; ?

    ("$,1@P(B" . "$,46C(B")
    ("$,1@P@m(B" . "$,47@(B")

    ("$,1@Q(B" . "$,46D(B")
    ("$,1@Q@m(B" . "$,47@(B") ;; same glyph as "$,1@P@m(B"
    ;;("$,1@Q@m@Q(B" . "$,47A(B")
    ("$,1@Q@m@Q(B" . "$,47d(B")

    ("$,1@R(B" . "$,46E(B")
    ("$,1@R@m(B" . "$,47B(B")
    ("$,1@R@m@R(B" . "$,47C(B") ;; lakar
    ("$,1@R@m@J(B" . "$,47e(B") ;; ?

    ("$,1@S(B" . "$,46F(B")
    ("$,1@S@m(B" . "$,47D(B")
    ("$,1@S@m@S(B" . "$,47E(B")

    ("$,1@T(B" . "$,46G(B")
    ("$,1@T@m(B" . "$,47D(B")

    ("$,1@U(B" . "$,46H(B")
    ("$,1@U@m@U(B" . "$,47F(B")

    ("$,1@V(B" . "$,46I(B")
    ("$,1@V@m@R(B" . "$,47G(B")
    ("$,1@V@m@V(B" . "$,47H(B")
    ("$,1@V@m@:(B" . "$,47](B")

    ("$,1@W(B" . "$,46J(B")
    ("$,1@W@m@?(B" . "$,47c(B")

    ("$,1@X(B" . "$,46K(B")
    ("$,1@X@m@R(B" . "$,47I(B")
    ("$,1@X@m@X(B" . "$,47J(B")
    ("$,1@X@m@Q@m@Q(B" . "$,47L(B")
    ("$,1@X@m@E(B" . "$,47X(B")

    ("$,1@Y(B" . "$,46L(B")
    ("$,1@Y@m@R(B" . "$,47K(B")
    ("$,1@Y@m@N(B" . "$,47R(B")
    ("$,1@Y@m@H(B" . "$,47S(B")

    ;; Dependent vowel signs
    ("$,1@^(B" . "$,46M(B")
    ("$,1@_(B" . "$,46N(B")
    ("$,1@`(B" . "$,46O(B")
    ("$,1@a(B" . "$,46P(B")
    ("$,1@b(B" . "$,46Q(B")
    ("$,1@c(B" . "$,46R(B")
    ("$,1@f(B" . "$,46S(B")
    ("$,1@g(B" . "$,46T(B")
    ("$,1@h(B" . "$,46S6S(B")
    ("$,1@j(B" . "$,46S6M(B")
    ("$,1@k(B" . "$,46T6M(B")
    ("$,1@l(B" . "$,46U(B")
    ;; Various signs
    ("$,1@m(B" . "$,46V(B")
    ("$,1@m@O(B" . "$,46Y(B") ;; yakar
    ("$,1@m@O@a(B" . "$,46\(B") ;; yakar + u ;; ?
    ("$,1@m@O@b(B" . "$,46](B") ;; yakar + uu ;; ?
    ("$,1@m@U(B" . "$,46Z(B") ;; vakar modifier
    ("$,1@m@P(B" . "$,46[(B") ;; rakar modifier is the same to rra modifier.
327
    ("$,1@m@P@m(B" . "$,46R(B") ;; halant + rakar + halant
Kenichi Handa's avatar
Kenichi Handa committed
328
    ("$,1@m@Q(B" . "$,46[(B") ;; rrakar modifier
329
    ("$,1@m@Q@m(B" . "$,46R(B") ;; halant + rrakar + halant
Kenichi Handa's avatar
Kenichi Handa committed
330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408
    ("$,1@m@m(B" . "$,46V(B") ;; double omission sign to stop forming half consonant.
    ("$,1@w(B" . "$,46U(B") ;; not in present use, already at 0D4C.
    ))

(defvar mlm-char-glyph-hash
  (let* ((hash (make-hash-table :test 'equal)))
    (mapc (function (lambda (x) (puthash (car x) (cdr x) hash)))
	  mlm-char-glyph)
    hash))

(defvar mlm-char-glyph-regexp
  (malayalam-regexp-of-hashtbl-keys mlm-char-glyph-hash))

;; Malayalam languages needed to be reordered in a complex mannar.

(defvar mlm-consonants
  (concat
  "$,46)6*6+6,6-6.6/606162636465666768696:6;6<6=6>6?6@6A6B6C6D6E6F6G6H6I6J6K6L(B"
  "$,47!7"7#7$7%7&7'7(7)7*7+7,7-7.7/707172737475767778797:7;7<7=7>7?7@7A7B7C7D7E7F7G7H7I7J7K7L7M7N7O7P7Q7R7S7T7U7V7W7X7Y7Z7[7\7]7^7_7`7a7b7c7d7e(B"
  ))

(defvar mlm-consonants-regexp
  (concat "\\($,46[(B?[" mlm-consonants "][$,46Y6Z(B]?\\)"))

(defvar mlm-glyph-reorder-key-glyphs "[$,46[6S6T(B]")

(defvar mlm-glyph-reordering-regexp-list
  `((,(concat "\\([" mlm-consonants "][$,46Y6Z(B]?\\)$,46[(B") . "$,46[(B\\1")
    (,(concat mlm-consonants-regexp "$,46S6S(B") . "$,46S6S(B\\1")
    (,(concat mlm-consonants-regexp "$,46S(B") . "$,46S(B\\1")
    (,(concat mlm-consonants-regexp "$,46T(B") . "$,46T(B\\1")))

(defun malayalam-compose-syllable-string (string)
  (with-temp-buffer
    (insert (decompose-string string))
    (malayalam-compose-syllable-region (point-min) (point-max))
    (buffer-string)))

(defun malayalam-compose-syllable-region (from to)
  "Compose malayalam syllable in region FROM to TO."
  (let (glyph-str
	match-str
	glyph-reorder-regexps
	glyph-reorder-replace
	glyph-reorder-regexp)
    (save-excursion
      (save-restriction
        (narrow-to-region from to)
        (goto-char (point-min))
        ;; char-glyph-conversion
        (while (re-search-forward mlm-char-glyph-regexp nil t)
          (setq match-str (match-string 0))
          (setq glyph-str
                (concat glyph-str (gethash match-str mlm-char-glyph-hash))))
        (when (string-match mlm-glyph-reorder-key-glyphs glyph-str)
          ;; glyph reordering
          (setq glyph-reorder-regexps mlm-glyph-reordering-regexp-list)
          (while glyph-reorder-regexps
            (setq glyph-reorder-regexp (caar glyph-reorder-regexps))
            (setq glyph-reorder-replace (cdar glyph-reorder-regexps))
            (setq glyph-reorder-regexps (cdr glyph-reorder-regexps))
            (if (string-match glyph-reorder-regexp glyph-str)
                (setq glyph-str
                      (replace-match glyph-reorder-replace nil nil
                                     glyph-str)))))
        ;; concatenate and attach reference-points.
        (setq glyph-str
              (cdr
               (apply
                'nconc
                (mapcar
                 (function 
                  (lambda (x) (list '(5 . 3) x))) ;; default ref. point.
                 glyph-str))))
        (compose-region from to glyph-str)))))

(provide 'mlm-util)

;;; devan-util.el ends here