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   1 ;;; quail/lrt.el --- Quail package for inputting Lao characters by LRT method
   2
   3 ;; Copyright (C) 1997 Electrotechnical Laboratory, JAPAN.
   4 ;; Licensed to the Free Software Foundation.
   5
   6 ;; Keywords: multilingual, input method, Lao, LRT.
   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., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24
  25 ;;; Code:
  26
  27 (require 'quail)
  28 (require 'lao-util)
  29
  30 ;; LRT (Lao Roman Transcription) input method accepts the following
  31 ;; key sequence:
  32 ;;      consonant [+ semi-vowel-sign-lo ] + vowel [+ maa-sakod ] [+ tone-mark ]
  33
  34 (eval-and-compile
  35
  36 ;; Upper vowels and tone-marks are put on the letter.
  37 ;; Semi-vowel-sign-lo and lower vowels are put under the letter.
  38 (defconst lrt-single-consonant-table
  39   '(("k" . ?\e(1!\e(B)
  40     ("kh" . ?\e(1"\e(B)
  41     ("qh" . ?\e(1$\e(B)
  42     ("ng" . ?\e(1'\e(B)
  43     ("j" . ?\e(1(\e(B)
  44     ("s" . ?\e(1J\e(B)
  45     ("x" . ?\e(1*\e(B)
  46     ("y" . ?\e(1-\e(B)
  47     ("d" . ?\e(14\e(B)
  48     ("t" . ?\e(15\e(B)
  49     ("th" . ?\e(16\e(B)
  50     ("dh" . ?\e(17\e(B)
  51     ("n" . ?\e(19\e(B)
  52     ("b" . ?\e(1:\e(B)
  53     ("p" . ?\e(1;\e(B)
  54     ("hp" . ?\e(1<\e(B)
  55     ("fh" . ?\e(1=\e(B)
  56     ("ph" . ?\e(1>\e(B)
  57     ("f" . ?\e(1?\e(B)
  58     ("m" . ?\e(1A\e(B)
  59     ("gn" . ?\e(1B\e(B)
  60     ("l" . ?\e(1E\e(B)
  61     ("r" . ?\e(1C\e(B)
  62     ("v" . ?\e(1G\e(B)
  63     ("w" . ?\e(1G\e(B)
  64     ("hh" . ?\e(1K\e(B)
  65     ("O" . ?\e(1M\e(B)
  66     ("h" . ?\e(1N\e(B)
  67     ("nh" . ?\e(1|\e(B)
  68     ("mh" . ?\e(1}\e(B)
  69     ("lh" . ?\e0\e(1K\\e1\e(B)
  70     ))
  71
  72 ;; Semi-vowel-sign-lo is put under the first letter.
  73 ;; Lower vowels are put under the last letter.
  74 ;; Upper vowels and tone-marks are put on the last letter.
  75 (defconst lrt-double-consonant-table
  76   '(("ngh" . "\e(1K'\e(B")
  77     ("yh" . "\e(1K]\e(B")
  78     ("wh" . "\e(1KG\e(B")
  79     ("hl" . "\e(1KE\e(B")
  80     ("hy" . "\e(1K-\e(B")
  81     ("hn" . "\e(1K9\e(B")
  82     ("hm" . "\e(1KA\e(B")
  83     ))
  84
  85 (defconst lrt-semi-vowel-sign-lo
  86   '("r" . ?\e(1\\e(B))
  87
  88 (defconst lrt-vowel-table
  89   '(("a" "\e(1P\e(B" (0 ?\e(1P\e(B) (0 ?\e(1Q\e(B))
  90     ("ar" "\e(1R\e(B" (0 ?\e(1R\e(B))
  91     ("i" "\e(1T\e(B" (0 ?\e(1T\e(B))
  92     ("ii" "\e(1U\e(B" (0 ?\e(1U\e(B))
  93     ("eu" "\e(1V\e(B" (0 ?\e(1V\e(B))
  94     ("ur" "\e(1W\e(B" (0 ?\e(1W\e(B))
  95     ("u" "\e(1X\e(B" (0 ?\e(1X\e(B))
  96     ("uu" "\e(1Y\e(B" (0 ?\e(1Y\e(B))
  97     ("e" "\e(1`\e(B \e(1P\e(B" (?\e(1`\e(B 0 ?\e(1P\e(B) (?\e(1`\e(B 0 ?\e(1Q\e(B))
  98     ("ee" "\e(1`\e(B" (?\e(1`\e(B 0))
  99     ("ae" "\e(1a\e(B \e(1P\e(B" (?\e(1a\e(B 0 ?\e(1P\e(B) (?\e(1a\e(B 0 ?\e(1Q\e(B))
 100     ("aa" "\e(1a\e(B" (?\e(1a\e(B 0))
 101     ("o" "\e(1b\e(B \e(1P\e(B" (?\e(1b\e(B 0 ?\e(1P\e(B) (0 ?\e(1[\e(B) (?\e(1-\e(B ?\e(1b\e(B 0 ?\e(1Q\e(B) (?\e(1G\e(B ?\e(1b\e(B 0 ?\e(1Q\e(B))
 102     ("oo" "\e(1b\e(B" (?\e(1b\e(B 0))
 103     ("oe" "\e(1`\e(B \e(1RP\e(B" (?\e(1`\e(B 0 ?\e(1R\e(B ?\e(1P\e(B) (0 ?\e(1Q\e(B ?\e(1M\e(B))
 104     ("or" "\e(1m\e(B" (0 ?\e(1m\e(B) (0 ?\e(1M\e(B))
 105     ("er" "\e(1`\e(B \e(1T\e(B" (?\e(1`\e(B 0 ?\e(1T\e(B))
 106     ("ir" "\e(1`\e(B \e(1U\e(B" (?\e(1`\e(B 0 ?\e(1U\e(B))
 107     ("oua" "\e(1[GP\e(B" (0 ?\e(1[\e(B ?\e(1G\e(B ?\e(1P\e(B) (0 ?\e(1Q\e(B ?\e(1G\e(B))
 108     ("ua" "\e(1[G\e(B" (0 ?\e(1[\e(B ?\e(1G\e(B) (0 ?\e(1G\e(B))
 109     ("ie" "\e(1`Q]P\e(B" (?\e(1`\e(B 0 ?\e(1Q\e(B ?\e(1]\e(B ?\e(1P\e(B) (0 ?\e(1Q\e(B ?\e(1]\e(B))
 110     ("ia" "\e(1`Q]\e(B" (?\e(1`\e(B 0 ?\e(1Q\e(B ?\e(1]\e(B) (0 ?\e(1]\e(B))
 111     ("eua" "\e(1`VM\e(B" (?\e(1`\e(B 0 ?\e(1V\e(B ?\e(1M\e(B))
 112     ("ea" "\e(1`WM\e(B" (?\e(1`\e(B 0 ?\e(1W\e(B ?\e(1M\e(B))
 113     ("ai" "\e(1d\e(B" (?\e(1d\e(B 0))
 114     ("ei" "\e(1c\e(B" (?\e(1c\e(B 0))
 115     ("ow" "\e(1`[R\e(B" (?\e(1`\e(B 0 ?\e(1[\e(B ?\e(1R\e(B))
 116     ("am" "\e(1S\e(B" (?\e(1S\e(B 0))))
 117
 118 ;; Maa-sakod is put at the tail.
 119 (defconst lrt-maa-sakod-table
 120   '((?k . ?\e(1!\e(B)
 121     (?g . ?\e(1'\e(B)
 122     (?y . ?\e(1-\e(B)
 123     (?d . ?\e(14\e(B)
 124     (?n . ?\e(19\e(B)
 125     (?b . ?\e(1:\e(B)
 126     (?m . ?\e(1A\e(B)
 127     (?v . ?\e(1G\e(B)
 128     (?w . ?\e(1G\e(B)
 129     ))
 130
 131 (defconst lrt-tone-mark-table
 132   '(("'" . ?\e(1h\e(B)
 133     ("\"" . ?\e(1i\e(B)
 134     ("^" . ?\e(1j\e(B)
 135     ("+" . ?\e(1k\e(B)
 136     ("~" . ?\e(1l\e(B)))
 137
 138 ;; Return list of composing patterns for normal (without maa-sakod)
 139 ;; key sequence and with-maa-sakod key sequence starting with single
 140 ;; consonant C and optional SEMI-VOWEL.
 141 (defun lrt-composing-pattern-single-c (c semi-vowel vowel-pattern)
 142   (let* ((patterns (copy-sequence vowel-pattern))
 143          (tail patterns)
 144          place)
 145     ;; Embed C and SEMI-VOWEL (if any) at the place of 0.
 146     (while tail
 147       ;; At first, make a copy.
 148       (setcar tail (copy-sequence (car tail)))
 149       ;; Then, do embedding.
 150       (setq place (memq 0 (car tail)))
 151       (setcar place c)
 152       (if semi-vowel
 153           (setcdr place (cons semi-vowel (cdr place))))
 154       (setq tail (cdr tail)))
 155     patterns))
 156
 157 ;; Return list of composing patterns for normal (without maa-sakod)
 158 ;; key sequence and with-maa-sakod key sequence starting with double
 159 ;; consonant STR and optional SEMI-VOWEL.
 160 (defun lrt-composing-pattern-double-c (str semi-vowel vowel-pattern)
 161   (let* ((patterns (copy-sequence vowel-pattern))
 162          (tail patterns)
 163          (chars (string-to-list str))
 164          place)
 165     ;; Embed C and SEMI-VOWEL (if any) at the place of 0.
 166     (while tail
 167       ;; At first, make a copy.
 168       (setcar tail (copy-sequence (car tail)))
 169       ;; Then, do embedding.
 170       (setq place (memq 0 (car tail)))
 171       (setcar place (car chars))
 172       (setcdr place (cons (nth 1 chars) (cdr place)))
 173       (if semi-vowel
 174           ;; Embed SEMI-VOWEL in between CHARS.
 175           (setcdr place (cons semi-vowel (cdr place))))
 176       (setq tail (cdr tail)))
 177     patterns))
 178
 179 ;; Return a string made of characters in CHAR-LIST while composing
 180 ;; such characters as vowel-upper, vowel-lower, semi-vowel(lower),
 181 ;; and tone-mark with the preceding base character.
 182 (defun lrt-compose-string (char-list)
 183   ;; Make a copy because the following work alters it.
 184   (setq char-list (copy-sequence char-list))
 185   (let ((i -1)
 186         (l char-list))
 187     (while l
 188       (if (memq (get-char-code-property (car l) 'phonetic-type)
 189                 '(vowel-upper vowel-lower semivowel-lower tone))
 190           (let (composed-char)
 191             (if (< i 0)
 192                 ;; No preceding base character.
 193                 (error "Invalid CHAR-LIST: %s" char-list))
 194             (setq composed-char
 195                   (string-to-char (compose-chars (nth i char-list) (car l))))
 196             (setcar (nthcdr i char-list) composed-char)
 197             (setq l (cdr l))
 198             (setcdr (nthcdr i char-list) l))
 199         (setq l (cdr l))
 200         (setq i (1+ i))))
 201     (concat (apply 'vector char-list))))
 202
 203 (defun lrt-compose-c-s-v (consonant semi-vowel vowel-pattern)
 204   (let ((pattern-list
 205          (if (integerp consonant)
 206              (lrt-composing-pattern-single-c
 207               consonant semi-vowel vowel-pattern)
 208            (lrt-composing-pattern-double-c
 209             consonant semi-vowel vowel-pattern))))
 210     (cons (vector (lrt-compose-string (car pattern-list)))
 211           (cons t pattern-list))))
 212
 213 )
 214
 215 (defun lrt-handle-maa-sakod ()
 216   (interactive)
 217   (if (= (length quail-current-key) 0)
 218       (quail-self-insert-command)
 219     (if (not (and quail-current-data (car quail-current-data)))
 220         (progn
 221           (setq quail-current-data nil)
 222           (setq unread-command-events
 223                 (cons last-command-event unread-command-events))
 224           (quail-terminate-translation))
 225       (if (not (integerp last-command-event))
 226           (error "Bogus calling sequence"))
 227       (let* ((maa-sakod (cdr (assq last-command-event lrt-maa-sakod-table)))
 228              (maa-sakod-pattern (append
 229                                  (or (cdr (assq maa-sakod
 230                                                 (nthcdr 3 quail-current-data)))
 231                                      (nth 2 quail-current-data)
 232                                      (nth 1 quail-current-data))
 233                                  (list maa-sakod))))
 234         (quail-delete-region)
 235         (setq quail-current-str (lrt-compose-string maa-sakod-pattern))
 236         (insert quail-current-str)
 237         (setq quail-current-key " ")
 238         (quail-show-translations)
 239         (setq quail-current-data (list nil maa-sakod-pattern))))))
 240
 241 (defun lrt-handle-tone-mark ()
 242   (interactive)
 243   (if (= (length quail-current-key) 0)
 244       (quail-self-insert-command)
 245     (if (not quail-current-data)
 246         (progn
 247           (setq unread-command-events
 248                 (cons last-command-event unread-command-events))
 249           (quail-terminate-translation))
 250       (if (not (integerp last-command-event))
 251           (error "Bogus calling sequence"))
 252       (let* ((tone-mark (cdr (assoc (char-to-string last-command-event)
 253                                     lrt-tone-mark-table)))
 254              (tone-mark-pattern
 255               (if (car quail-current-data)
 256                   (copy-sequence (nth 1 quail-current-data))
 257                 ;; No need of copy because lrt-handle-maa-sakod should
 258                 ;; have already done it.
 259                 (nth 1 quail-current-data)))
 260              (tail tone-mark-pattern)
 261              place)
 262         ;; Find a place to embed TONE-MARK.  It should be after a
 263         ;; single or double consonant.
 264         (while (and tail (not place))
 265           (if (and
 266                ;; Skip `\e(1K\e(B', the first letter of double consonant.
 267                (/= (car tail) ?\e(1K\e(B)
 268                (eq (get-char-code-property (car tail) 'phonetic-type)
 269                    'consonant))
 270               (progn
 271                 (setq place tail)
 272                 (setq tail (cdr tail))
 273                 (while (and tail
 274                             (memq (get-char-code-property (car tail)
 275                                                           'phonetic-type)
 276                                   '(vowel-upper vowel-lower semivowel-lower)))
 277                   (setq place tail tail (cdr tail))))
 278             (setq tail (cdr tail))))
 279         ;; Embed TONE-MARK.
 280         (setcdr place (cons tone-mark (cdr place)))
 281         (quail-delete-region)
 282         (insert (lrt-compose-string tone-mark-pattern))
 283         (setq quail-current-data nil)
 284         (quail-terminate-translation)))))
 285
 286 (defmacro lrt-generate-quail-map ()
 287   `(quail-install-map
 288     ',(let ((map (list nil))
 289             (semi-vowel-key (car lrt-semi-vowel-sign-lo))
 290             (semi-vowel-char (cdr lrt-semi-vowel-sign-lo))
 291             l1 e1 l2 e2 pattern key)
 292         ;; Single consonants.
 293         (setq l1 lrt-single-consonant-table)
 294         (while l1
 295           (setq e1 (car l1))
 296           (quail-defrule-internal (car e1) (cdr e1) map)
 297           (quail-defrule-internal
 298            (concat (car e1) semi-vowel-key)
 299            (compose-string (format "%c%c" (cdr e1) semi-vowel-char))
 300            map)
 301           (setq l2 lrt-vowel-table)
 302           (while l2
 303             (setq e2 (car l2))
 304             (setq key (concat (car e1) (car e2))
 305                   pattern (lrt-compose-c-s-v (cdr e1) nil (nthcdr 2 e2)))
 306             (quail-defrule-internal key pattern map)
 307             (quail-defrule-internal
 308              (concat key " ")
 309              (vector (concat (aref (car pattern) 0) " "))  map)
 310             (setq key (concat (car e1) semi-vowel-key (car e2))
 311                   pattern (lrt-compose-c-s-v (cdr e1) semi-vowel-char
 312                                              (nthcdr 2 e2)))
 313             (quail-defrule-internal key pattern map)
 314             (quail-defrule-internal
 315              (concat key " ")
 316              (vector (concat (aref (car pattern) 0) " "))  map)
 317             (setq l2 (cdr l2)))
 318           (setq l1 (cdr l1)))
 319
 320         ;; Double consonants.
 321         (setq l1 lrt-double-consonant-table)
 322         (while l1
 323           (setq e1 (car l1))
 324           (quail-defrule-internal (car e1) (vector (cdr e1)) map)
 325           (quail-defrule-internal
 326            (concat (car e1) semi-vowel-key)
 327            (vector (concat (compose-string
 328                             (format "%c%c" (sref (cdr e1) 0) semi-vowel-char))
 329                            (substring (cdr e1) (charset-bytes 'lao))))
 330            map)
 331           (setq l2 lrt-vowel-table)
 332           (while l2
 333             (setq e2 (car l2))
 334             (setq key (concat (car e1) (car e2))
 335                   pattern (lrt-compose-c-s-v (cdr e1) nil (nthcdr 2 e2)))
 336             (quail-defrule-internal key pattern map)
 337             (quail-defrule-internal
 338              (concat key " ")
 339              (vector (concat (aref (car pattern) 0) " "))  map)
 340             (setq key (concat (car e1) semi-vowel-key (car e2))
 341                   pattern (lrt-compose-c-s-v (cdr e1) semi-vowel-char
 342                                              (nthcdr 2 e2)))
 343             (quail-defrule-internal key pattern map)
 344             (quail-defrule-internal
 345              (concat key " ")
 346              (vector (concat (aref (car pattern) 0) " "))  map)
 347             (setq l2 (cdr l2)))
 348           (setq l1 (cdr l1)))
 349
 350         ;; Vowels.
 351         (setq l1 lrt-vowel-table)
 352         (while l1
 353           (setq e1 (car l1) l1 (cdr l1))
 354           (quail-defrule-internal (car e1) (vector (nth 1 e1)) map))
 355
 356         ;; Tone-marks.
 357         (setq l1 lrt-tone-mark-table)
 358         (while l1
 359           (setq e1 (car l1) l1 (cdr l1))
 360           (quail-defrule-internal (car e1) (cdr e1) map))
 361
 362         map)))
 363
 364 (quail-define-package
 365  "lao-lrt" "Lao" "\e(1"\e(BR" t
 366  "Lao input method using LRT (Lao Roman Transcription)"
 367  '(("k" . lrt-handle-maa-sakod)
 368    ("g" . lrt-handle-maa-sakod)
 369    ("y" . lrt-handle-maa-sakod)
 370    ("d" . lrt-handle-maa-sakod)
 371    ("n" . lrt-handle-maa-sakod)
 372    ("b" . lrt-handle-maa-sakod)
 373    ("m" . lrt-handle-maa-sakod)
 374    ("v" . lrt-handle-maa-sakod)
 375    ("w" . lrt-handle-maa-sakod)
 376    ("'" . lrt-handle-tone-mark)
 377    ("\"" . lrt-handle-tone-mark)
 378    ("^" . lrt-handle-tone-mark)
 379    ("+" . lrt-handle-tone-mark)
 380    ("~" . lrt-handle-tone-mark))
 381  'forget-last-selection 'deterministic 'kbd-translate 'show-layout)
 382
 383 (lrt-generate-quail-map)