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

   1 ;;; lao-util.el --- utilities for Lao -*- coding: iso-2022-7bit; -*-
   2
   3 ;; Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
   4 ;;   Free Software Foundation, Inc.
   5 ;; Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
   6 ;;   National Institute of Advanced Industrial Science and Technology (AIST)
   7 ;;   Registration Number H14PRO021
   8 ;; Copyright (C) 2003
   9 ;;   National Institute of Advanced Industrial Science and Technology (AIST)
  10 ;;   Registration Number H13PRO009
  11
  12 ;; Keywords: multilingual, Lao, i18n
  13
  14 ;; This file is part of GNU Emacs.
  15
  16 ;; GNU Emacs is free software; you can redistribute it and/or modify
  17 ;; it under the terms of the GNU General Public License as published by
  18 ;; the Free Software Foundation; either version 3, or (at your option)
  19 ;; any later version.
  20
  21 ;; GNU Emacs is distributed in the hope that it will be useful,
  22 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  23 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24 ;; GNU General Public License for more details.
  25
  26 ;; You should have received a copy of the GNU General Public License
  27 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  28 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  29 ;; Boston, MA 02110-1301, USA.
  30
  31 ;;; Commentary:
  32
  33 ;;; Code:
  34
  35 ;; Setting information of Thai characters.
  36
  37 (defconst lao-category-table (make-category-table))
  38 (define-category ?c "Lao consonant" lao-category-table)
  39 (define-category ?s "Lao semi-vowel" lao-category-table)
  40 (define-category ?v "Lao upper/lower vowel" lao-category-table)
  41 (define-category ?t "Lao tone" lao-category-table)
  42
  43 (let ((l '((?\e(1!\e(B consonant "LETTER KOR  KAI'" "CHICKEN")
  44            (?\e(1"\e(B consonant "LETTER KHOR KHAI'" "EGG")
  45            (?\e(1#\e(B invalid nil)
  46            (?\e(1$\e(B consonant "LETTER QHOR QHWARGN" "BUFFALO")
  47            (?\e(1%\e(B invalid nil)
  48            (?  invalid nil)
  49            (?\e(1'\e(B consonant "LETTER NGOR NGUU" "SNAKE")
  50            (?\e(1(\e(B consonant "LETTER JOR JUA" "BUDDHIST NOVICE")
  51            (?\e(1)\e(B invalid nil)
  52            (?\e(1*\e(B consonant "LETTER XOR X\"ARNG" "ELEPHANT")
  53            (?\e(1+\e(B invalid nil)
  54            (?\e(1,\e(B invalid nil)
  55            (?\e(1-\e(B consonant "LETTER YOR YUNG" "MOSQUITO")
  56            (?\e(1.\e(B invalid nil)
  57            (?\e(1.\e(B invalid nil)
  58            (?\e(1.\e(B invalid nil)
  59            (?\e(1.\e(B invalid nil)
  60            (?\e(1.\e(B invalid nil)
  61            (?\e(1.\e(B invalid nil)
  62            (?\e(14\e(B consonant "LETTER DOR DANG" "NOSE")
  63            (?\e(15\e(B consonant "LETTER TOR TAR" "EYE")
  64            (?\e(16\e(B consonant "LETTER THOR THUNG" "TO ASK,QUESTION")
  65            (?\e(17\e(B consonant "LETTER DHOR DHARM" "FLAG")
  66            (?\e(18\e(B invalid nil)
  67            (?\e(19\e(B consonant "LETTER NOR NOK" "BIRD")
  68            (?\e(1:\e(B consonant "LETTER BOR BED" "FISHHOOK")
  69            (?\e(1;\e(B consonant "LETTER POR PAR" "FISH")
  70            (?\e(1<\e(B consonant "LETTER HPOR HPER\"" "BEE")
  71            (?\e(1=\e(B consonant "LETTER FHOR FHAR" "WALL")
  72            (?\e(1>\e(B consonant "LETTER PHOR PHUU" "MOUNTAIN")
  73            (?\e(1?\e(B consonant "LETTER FOR FAI" "FIRE")
  74            (?\e(1@\e(B invalid nil)
  75            (?\e(1A\e(B consonant "LETTER MOR MAR\"" "HORSE")
  76            (?\e(1B\e(B consonant "LETTER GNOR GNAR" "MEDICINE")
  77            (?\e(1C\e(B consonant "LETTER ROR ROD" "CAR")
  78            (?\e(1D\e(B invalid nil)
  79            (?\e(1E\e(B consonant "LETTER LOR LIING" "MONKEY")
  80            (?\e(1F\e(B invalid nil)
  81            (?\e(1G\e(B consonant "LETTER WOR WII" "HAND FAN")
  82            (?\e(1H\e(B invalid nil)
  83            (?\e(1I\e(B invalid nil)
  84            (?\e(1J\e(B consonant "LETTER SOR SEA" "TIGER")
  85            (?\e(1K\e(B consonant "LETTER HHOR HHAI" "JAR")
  86            (?\e(1L\e(B invalid nil)
  87            (?\e(1M\e(B consonant "LETTER OR OOW" "TAKE")
  88            (?\e(1N\e(B consonant "LETTER HOR HEA" "BOAT")
  89            (?\e(1O\e(B special "ELLIPSIS")
  90            (?\e(1P\e(B vowel-base "VOWEL SIGN SARA A")
  91            (?\e(1Q\e(B vowel-upper "VOWEL SIGN MAI KAN")
  92            (?\e(1R\e(B vowel-base "VOWEL SIGN SARA AR")
  93            (?\e(1S\e(B vowel-base "VOWEL SIGN SARA AM")
  94            (?\e(1T\e(B vowel-upper "VOWEL SIGN SARA I")
  95            (?\e(1U\e(B vowel-upper "VOWEL SIGN SARA II")
  96            (?\e(1V\e(B vowel-upper "VOWEL SIGN SARA EU")
  97            (?\e(1W\e(B vowel-upper "VOWEL SIGN SARA UR")
  98            (?\e(1X\e(B vowel-lower "VOWEL SIGN SARA U")
  99            (?\e(1Y\e(B vowel-lower "VOWEL SIGN SARA UU")
 100            (?\e(1Z\e(B invalid nil)
 101            (?\e(1[\e(B vowel-upper "VOWEL SIGN MAI KONG")
 102            (?\e(1\\e(B semivowel-lower "SEMIVOWEL SIGN LO")
 103            (?\e(1]\e(B vowel-base "SEMIVOWEL SIGN SARA IA")
 104            (?\e(1^\e(B invalid nil)
 105            (?\e(1_\e(B invalid nil)
 106            (?\e(1`\e(B vowel-base "VOWEL SIGN SARA EE")
 107            (?\e(1a\e(B vowel-base "VOWEL SIGN SARA AA")
 108            (?\e(1b\e(B vowel-base "VOWEL SIGN SARA OO")
 109            (?\e(1c\e(B vowel-base "VOWEL SIGN SARA EI MAI MUAN\"")
 110            (?\e(1d\e(B vowel-base "VOWEL SIGN SARA AI MAI MAY")
 111            (?\e(1e\e(B invalid nil)
 112            (?\e(1f\e(B special "KO LA (REPETITION)")
 113            (?\e(1g\e(B invalid nil)
 114            (?\e(1h\e(B tone "TONE MAI EK")
 115            (?\e(1i\e(B tone "TONE MAI THO")
 116            (?\e(1j\e(B tone "TONE MAI TI")
 117            (?\e(1k\e(B tone "TONE MAI JADTAWAR")
 118            (?\e(1l\e(B tone "CANCELLATION MARK")
 119            (?\e(1m\e(B vowel-upper "VOWEL SIGN SARA OR")
 120            (?\e(1n\e(B invalid nil)
 121            (?\e(1o\e(B invalid nil)
 122            (?\e(1p\e(B special "DIGIT ZERO")
 123            (?\e(1q\e(B special "DIGIT ONE")
 124            (?\e(1r\e(B special "DIGIT TWO")
 125            (?\e(1s\e(B special "DIGIT THREE")
 126            (?\e(1t\e(B special "DIGIT FOUR")
 127            (?\e(1u\e(B special "DIGIT FIVE")
 128            (?\e(1v\e(B special "DIGIT SIX")
 129            (?\e(1w\e(B special "DIGIT SEVEN")
 130            (?\e(1x\e(B special "DIGIT EIGHT")
 131            (?\e(1y\e(B special "DIGIT NINE")
 132            (?\e(1z\e(B invalid nil)
 133            (?\e(1{\e(B invalid nil)
 134            (?\e(1|\e(B consonant "LETTER NHOR NHUU" "MOUSE")
 135            (?\e(1}\e(B consonant "LETTER MHOR MHAR" "DOG")
 136            (?\e(1~\e(B invalid nil)))
 137       elm)
 138   (while l
 139     (setq elm (car l) l (cdr l))
 140     (let ((char (car elm))
 141           (ptype (nth 1 elm)))
 142       (cond ((eq ptype 'consonant)
 143              (modify-category-entry char ?c lao-category-table))
 144             ((memq ptype '(vowel-upper vowel-lower))
 145              (modify-category-entry char ?v lao-category-table))
 146             ((eq ptype 'semivowel-lower)
 147              (modify-category-entry char ?s lao-category-table))
 148             ((eq ptype 'tone)
 149              (modify-category-entry char ?t lao-category-table)))
 150       (put-char-code-property char 'phonetic-type ptype)
 151       (put-char-code-property char 'name (nth 2 elm))
 152       (put-char-code-property char 'meaning (nth 3 elm)))))
 153
 154 ;; The general composing rules are as follows:
 155 ;;
 156 ;;                          T
 157 ;;       V        T         V                  T
 158 ;; CV -> C, CT -> C, CVT -> C, Cv -> C, CvT -> C
 159 ;;                                   v         v
 160 ;;                             T
 161 ;;        V         T          V                    T
 162 ;; CsV -> C, CsT -> C, CsVT -> C, Csv -> C, CsvT -> C
 163 ;;        s         s          s         s          s
 164 ;;                                       v          v
 165
 166
 167 ;; where C: consonant, V: vowel upper, v: vowel lower,
 168 ;;       T: tone mark, s: semivowel lower
 169
 170 (defvar lao-composition-pattern
 171   "\\cc\\(\\ct\\|\\cv\\ct?\\|\\cs\\(\\ct\\|\\cv\\ct?\\)?\\)"
 172   "Regular expression matching a Lao composite sequence.")
 173
 174 ;;;###autoload
 175 (defun lao-compose-string (str)
 176   (with-category-table lao-category-table
 177    (let ((idx 0))
 178      (while (setq idx (string-match lao-composition-pattern str idx))
 179        (compose-string str idx (match-end 0))
 180        (setq idx (match-end 0))))
 181    str))
 182
 183 ;;; LRT: Lao <-> Roman Transcription
 184
 185 ;; Upper vowels and tone-marks are put on the letter.
 186 ;; Semi-vowel-sign-lo and lower vowels are put under the letter.
 187
 188 (defconst lao-transcription-consonant-alist
 189   (sort '(;; single consonants
 190           ("k" . "\e(1!\e(B")
 191           ("kh" . "\e(1"\e(B")
 192           ("qh" . "\e(1$\e(B")
 193           ("ng" . "\e(1'\e(B")
 194           ("j" . "\e(1(\e(B")
 195           ("s" . "\e(1J\e(B")
 196           ("x" . "\e(1*\e(B")
 197           ("y" . "\e(1-\e(B")
 198           ("d" . "\e(14\e(B")
 199           ("t" . "\e(15\e(B")
 200           ("th" . "\e(16\e(B")
 201           ("dh" . "\e(17\e(B")
 202           ("n" . "\e(19\e(B")
 203           ("b" . "\e(1:\e(B")
 204           ("p" . "\e(1;\e(B")
 205           ("hp" . "\e(1<\e(B")
 206           ("fh" . "\e(1=\e(B")
 207           ("ph" . "\e(1>\e(B")
 208           ("f" . "\e(1?\e(B")
 209           ("m" . "\e(1A\e(B")
 210           ("gn" . "\e(1B\e(B")
 211           ("l" . "\e(1E\e(B")
 212           ("r" . "\e(1C\e(B")
 213           ("v" . "\e(1G\e(B")
 214           ("w" . "\e(1G\e(B")
 215           ("hh" . "\e(1K\e(B")
 216           ("O" . "\e(1M\e(B")
 217           ("h" . "\e(1N\e(B")
 218           ("nh" . "\e(1|\e(B")
 219           ("mh" . "\e(1}\e(B")
 220           ("lh" . ["\e(1K\\e(B"])
 221           ;; double consonants
 222           ("ngh" . ["\e(1K'\e(B"])
 223           ("yh" . ["\e(1K]\e(B"])
 224           ("wh" . ["\e(1KG\e(B"])
 225           ("hl" . ["\e(1KE\e(B"])
 226           ("hy" . ["\e(1K-\e(B"])
 227           ("hn" . ["\e(1K9\e(B"])
 228           ("hm" . ["\e(1KA\e(B"])
 229           )
 230         (function (lambda (x y) (> (length (car x)) (length (car y)))))))
 231
 232 (defconst lao-transcription-semi-vowel-alist
 233   '(("r" . "\e(1\\e(B")))
 234
 235 (defconst lao-transcription-vowel-alist
 236   (sort '(("a" . "\e(1P\e(B")
 237           ("ar" . "\e(1R\e(B")
 238           ("i" . "\e(1T\e(B")
 239           ("ii" . "\e(1U\e(B")
 240           ("eu" . "\e(1V\e(B")
 241           ("ur" . "\e(1W\e(B")
 242           ("u" . "\e(1X\e(B")
 243           ("uu" . "\e(1Y\e(B")
 244           ("e" . ["\e(1`P\e(B"])
 245           ("ee" . "\e(1`\e(B")
 246           ("ae" . ["\e(1aP\e(B"])
 247           ("aa" . "\e(1a\e(B")
 248           ("o" . ["\e(1bP\e(B"])
 249           ("oo" . "\e(1b\e(B")
 250           ("oe" . ["\e(1`RP\e(B"])
 251           ("or" . "\e(1m\e(B")
 252           ("er" . ["\e(1`T\e(B"])
 253           ("ir" . ["\e(1`U\e(B"])
 254           ("ua" . ["\e(1[GP\e(B"])
 255           ("uaa" . ["\e(1[G\e(B"])
 256           ("ie" . ["\e(1`Q]P\e(B"])
 257           ("ia" . ["\e(1`Q]\e(B"])
 258           ("ea" . ["\e(1`VM\e(B"])
 259           ("eaa" . ["\e(1`WM\e(B"])
 260           ("ai" . "\e(1d\e(B")
 261           ("ei" . "\e(1c\e(B")
 262           ("ao" . ["\e(1`[R\e(B"])
 263           ("aM" . "\e(1S\e(B"))
 264         (function (lambda (x y) (> (length (car x)) (length (car y)))))))
 265
 266 ;; Maa-sakod is put at the tail.
 267 (defconst lao-transcription-maa-sakod-alist
 268   '(("k" . "\e(1!\e(B")
 269     ("g" . "\e(1'\e(B")
 270     ("y" . "\e(1-\e(B")
 271     ("d" . "\e(14\e(B")
 272     ("n" . "\e(19\e(B")
 273     ("b" . "\e(1:\e(B")
 274     ("m" . "\e(1A\e(B")
 275     ("v" . "\e(1G\e(B")
 276     ("w" . "\e(1G\e(B")
 277     ))
 278
 279 (defconst lao-transcription-tone-alist
 280   '(("'" . "\e(1h\e(B")
 281     ("\"" . "\e(1i\e(B")
 282     ("^" . "\e(1j\e(B")
 283     ("+" . "\e(1k\e(B")
 284     ("~" . "\e(1l\e(B")))
 285
 286 (defconst lao-transcription-punctuation-alist
 287   '(("\\0" . "\e(1p\e(B")
 288     ("\\1" . "\e(1q\e(B")
 289     ("\\2" . "\e(1r\e(B")
 290     ("\\3" . "\e(1s\e(B")
 291     ("\\4" . "\e(1t\e(B")
 292     ("\\5" . "\e(1u\e(B")
 293     ("\\6" . "\e(1v\e(B")
 294     ("\\7" . "\e(1w\e(B")
 295     ("\\8" . "\e(1x\e(B")
 296     ("\\9" . "\e(1y\e(B")
 297     ("\\\\" . "\e(1f\e(B")
 298     ("\\$" . "\e(1O\e(B")))
 299
 300 (defconst lao-transcription-pattern
 301   (concat
 302    "\\("
 303    (mapconcat 'car lao-transcription-consonant-alist "\\|")
 304    "\\)\\("
 305    (mapconcat 'car lao-transcription-semi-vowel-alist "\\|")
 306    "\\)?\\(\\("
 307    (mapconcat 'car lao-transcription-vowel-alist "\\|")
 308    "\\)\\("
 309    (mapconcat 'car lao-transcription-maa-sakod-alist "\\|")
 310    "\\)?\\("
 311    (mapconcat (lambda (x) (regexp-quote (car x)))
 312               lao-transcription-tone-alist "\\|")
 313    "\\)?\\)?\\|"
 314    (mapconcat (lambda (x) (regexp-quote (car x)))
 315               lao-transcription-punctuation-alist "\\|")
 316    )
 317   "Regexp of Roman transcription pattern for one Lao syllable.")
 318
 319 (defconst lao-transcription-pattern
 320   (concat
 321    "\\("
 322    (regexp-opt (mapcar 'car lao-transcription-consonant-alist))
 323    "\\)\\("
 324    (regexp-opt (mapcar 'car lao-transcription-semi-vowel-alist))
 325    "\\)?\\(\\("
 326    (regexp-opt (mapcar 'car lao-transcription-vowel-alist))
 327    "\\)\\("
 328    (regexp-opt (mapcar 'car lao-transcription-maa-sakod-alist))
 329    "\\)?\\("
 330    (regexp-opt (mapcar 'car lao-transcription-tone-alist))
 331    "\\)?\\)?\\|"
 332    (regexp-opt (mapcar 'car lao-transcription-punctuation-alist))
 333    )
 334   "Regexp of Roman transcription pattern for one Lao syllable.")
 335
 336 (defconst lao-vowel-reordering-rule
 337   '(("\e(1P\e(B" (0 ?\e(1P\e(B) (0 ?\e(1Q\e(B))
 338     ("\e(1R\e(B" (0 ?\e(1R\e(B))
 339     ("\e(1T\e(B" (0 ?\e(1U\e(B))
 340     ("\e(1U\e(B" (0 ?\e(1U\e(B))
 341     ("\e(1V\e(B" (0 ?\e(1V\e(B))
 342     ("\e(1W\e(B" (0 ?\e(1W\e(B))
 343     ("\e(1X\e(B" (0 ?\e(1X\e(B))
 344     ("\e(1Y\e(B" (0 ?\e(1Y\e(B))
 345     ("\e(1`P\e(B" (?\e(1`\e(B 0 ?\e(1P\e(B) (?\e(1`\e(B 0 ?\e(1Q\e(B))
 346     ("\e(1`\e(B" (?\e(1`\e(B 0))
 347     ("\e(1aP\e(B" (?\e(1a\e(B 0 ?\e(1P\e(B) (?\e(1a\e(B 0 ?\e(1Q\e(B))
 348     ("\e(1a\e(B" (?\e(1a\e(B 0))
 349     ("\e(1bP\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))
 350     ("\e(1b\e(B" (?\e(1b\e(B 0))
 351     ("\e(1`RP\e(B" (?\e(1`\e(B 0 ?\e(1R\e(B ?\e(1P\e(B) (0 ?\e(1Q\e(B ?\e(1M\e(B))
 352     ("\e(1m\e(B" (0 ?\e(1m\e(B) (0 ?\e(1M\e(B))
 353     ("\e(1`T\e(B" (?\e(1`\e(B 0 ?\e(1T\e(B))
 354     ("\e(1`U\e(B" (?\e(1`\e(B 0 ?\e(1U\e(B))
 355     ("\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))
 356     ("\e(1[G\e(B" (0 ?\e(1[\e(B ?\e(1G\e(B) (0 ?\e(1G\e(B))
 357     ("\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))
 358     ("\e(1`Q]\e(B" (?\e(1`\e(B 0 ?\e(1Q\e(B ?\e(1]\e(B) (0 ?\e(1]\e(B))
 359     ("\e(1`VM\e(B" (?\e(1`\e(B 0 ?\e(1V\e(B ?\e(1M\e(B))
 360     ("\e(1`WM\e(B" (?\e(1`\e(B 0 ?\e(1W\e(B ?\e(1M\e(B))
 361     ("\e(1d\e(B" (?\e(1d\e(B 0))
 362     ("\e(1c\e(B" (?\e(1c\e(B 0))
 363     ("\e(1`[R\e(B" (?\e(1`\e(B 0 ?\e(1[\e(B ?\e(1R\e(B))
 364     ("\e(1S\e(B" (0 ?\e(1S\e(B)))
 365   "Alist of Lao vowel string vs the corresponding re-ordering rule.
 366 Each element has this form:
 367         (VOWEL NO-MAA-SAKOD-RULE WITH-MAA-SAKOD-RULE (MAA-SAKOD-0 RULE-0) ...)
 368
 369 VOWEL is a vowel string (e.g. \"\e(1`Q]P\e(B\").
 370
 371 NO-MAA-SAKOD-RULE is a rule to re-order and modify VOWEL following a
 372 consonant.  It is a list vowel characters or 0.  The element 0
 373 indicate the place to embed a consonant.
 374
 375 Optional WITH-MAA-SAKOD-RULE is a rule to re-order and modify VOWEL
 376 follwoing a consonant and preceding a maa-sakod character.  If it is
 377 nil, NO-MAA-SAKOD-RULE is used.  The maa-sakod character is alwasy
 378 appended at the tail.
 379
 380 For instance, rule `(\"\e(1`WM\e(B\" (?\e(1`\e(B t ?\e(1W\e(B ?\e(1M\e(B))' tells that this vowel
 381 string following a consonant `\e(1!\e(B' should be re-ordered as \"\e(1`!WM\e(B\".
 382
 383 Optional (MAA-SAKOD-n RULE-n) are rules specially applied to maa-sakod
 384 character MAA-SAKOD-n.")
 385
 386 ;;;###autoload
 387 (defun lao-transcribe-single-roman-syllable-to-lao (from to &optional str)
 388   "Transcribe a Romanized Lao syllable in the region FROM and TO to Lao string.
 389 Only the first syllable is transcribed.
 390 The value has the form: (START END LAO-STRING), where
 391 START and END are the beggining and end positions of the Roman Lao syllable,
 392 LAO-STRING is the Lao character transcription of it.
 393
 394 Optional 3rd arg STR, if non-nil, is a string to search for Roman Lao
 395 syllable.  In that case, FROM and TO are indexes to STR."
 396   (if str
 397       (if (setq from (string-match lao-transcription-pattern str from))
 398           (progn
 399             (if (>= from to)
 400                 (setq from nil)
 401               (setq to (match-end 0)))))
 402     (save-excursion
 403       (goto-char from)
 404       (if (setq to (re-search-forward lao-transcription-pattern to t))
 405           (setq from (match-beginning 0))
 406         (setq from nil))))
 407   (if from
 408       (let* ((consonant (match-string 1 str))
 409              (semivowel (match-string 3 str))
 410              (vowel (match-string 5 str))
 411              (maa-sakod (match-string 8 str))
 412              (tone (match-string 9 str))
 413              lao-consonant lao-semivowel lao-vowel lao-maa-sakod lao-tone
 414              clen cidx)
 415         (setq to (match-end 0))
 416         (if (not consonant)
 417             (setq str (cdr (assoc (match-string 0 str)
 418                                   lao-transcription-punctuation-alist)))
 419           (setq lao-consonant
 420                 (cdr (assoc consonant lao-transcription-consonant-alist)))
 421           (if (vectorp lao-consonant)
 422               (setq lao-consonant (aref lao-consonant 0)))
 423           (setq clen (length lao-consonant))
 424           (if semivowel
 425               ;; Include semivowel in STR.
 426               (setq lao-semivowel
 427                     (cdr (assoc semivowel lao-transcription-semi-vowel-alist))
 428                     str (if (= clen 1)
 429                             (concat lao-consonant lao-semivowel)
 430                           (concat (substring lao-consonant 0 1) lao-semivowel
 431                                   (substring lao-consonant 1))))
 432             (setq str lao-consonant))
 433           (if vowel
 434               (let (rule)
 435                 (setq lao-vowel
 436                       (cdr (assoc vowel lao-transcription-vowel-alist)))
 437                 (if (vectorp lao-vowel)
 438                     (setq lao-vowel (aref lao-vowel 0)))
 439                 (setq rule (assoc lao-vowel lao-vowel-reordering-rule))
 440                 (if (null maa-sakod)
 441                     (setq rule (nth 1 rule))
 442                   (setq lao-maa-sakod
 443                         (cdr (assoc maa-sakod lao-transcription-maa-sakod-alist))
 444                         rule
 445                         (or (cdr (assq (aref lao-maa-sakod 0) (nthcdr 2 rule)))
 446                             (nth 2 rule)
 447                             (nth 1 rule))))
 448                 (or rule
 449                     (error "Lao vowel %S has no re-ordering rule" lao-vowel))
 450                 (setq lao-consonant str str "")
 451                 (while rule
 452                   (if (= (car rule) 0)
 453                       (setq str (concat str lao-consonant)
 454                             cidx (length str))
 455                     (setq str (concat str (list (car rule)))))
 456                   (setq rule (cdr rule)))
 457                 (or cidx
 458                     (error "Lao vowel %S has malformed re-ordering rule" vowel))
 459                 ;; Set CIDX to after upper or lower vowel if any.
 460                 (let ((len (length str)))
 461                   (while (and (< cidx len)
 462                               (memq (get-char-code-property (aref str cidx)
 463                                                             'phonetic-type)
 464                                     '(vowel-lower vowel-upper)))
 465                     (setq cidx (1+ cidx))))
 466                 (if lao-maa-sakod
 467                     (setq str (concat str lao-maa-sakod)))
 468                 (if tone
 469                     (setq lao-tone
 470                           (cdr (assoc tone lao-transcription-tone-alist))
 471                           str (concat (substring str 0 cidx) lao-tone
 472                                       (substring str cidx)))))))
 473         (list from to (lao-compose-string str)))))
 474
 475 ;;;###autoload
 476 (defun lao-transcribe-roman-to-lao-string (str)
 477   "Transcribe Romanized Lao string STR to Lao character string."
 478   (let ((from 0)
 479         (to (length str))
 480         (lao-str "")
 481         val)
 482     (while (setq val (lao-transcribe-single-roman-syllable-to-lao from to str))
 483       (let ((start (car val))
 484             (end (nth 1 val))
 485             (lao (nth 2 val)))
 486         (if (> start from)
 487             (setq lao-str (concat lao-str (substring str from start) lao))
 488           (setq lao-str (concat lao-str lao)))
 489         (setq from end)))
 490     (if (< from to)
 491         (concat lao-str (substring str from to))
 492       lao-str)))
 493
 494 ;;;###autoload
 495 (defun lao-composition-function (pos &optional string)
 496   (setq pos (1- pos))
 497   (with-category-table lao-category-table
 498     (if string
 499         (if (and (>= pos 0)
 500                  (eq (string-match lao-composition-pattern string pos) pos))
 501             (prog1 (match-end 0)
 502               (compose-string string pos (match-end 0))))
 503       (if (>= pos (point-min))
 504           (save-excursion
 505             (goto-char pos)
 506             (if (looking-at lao-composition-pattern)
 507                 (prog1 (match-end 0)
 508                   (compose-region pos (match-end 0)))))))))
 509
 510 ;;;###autoload
 511 (defun lao-compose-region (from to)
 512   (interactive "r")
 513   (save-restriction
 514     (narrow-to-region from to)
 515     (goto-char (point-min))
 516     (with-category-table lao-category-table
 517       (while (re-search-forward lao-composition-pattern nil t)
 518         (compose-region (match-beginning 0) (point))))))
 519
 520 ;;
 521 (provide 'lao-util)
 522
 523 ;;; arch-tag: 1f828781-3cb8-4695-88af-8f33222338ce
 524 ;;; lao-util.el ends here