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, 2008
   4 ;;   Free Software Foundation, Inc.
   5 ;; Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
   6 ;;   2007, 2008
   7 ;;   National Institute of Advanced Industrial Science and Technology (AIST)
   8 ;;   Registration Number H14PRO021
   9 ;; Copyright (C) 2003
  10 ;;   National Institute of Advanced Industrial Science and Technology (AIST)
  11 ;;   Registration Number H13PRO009
  12
  13 ;; Keywords: multilingual, Lao, i18n
  14
  15 ;; This file is part of GNU Emacs.
  16
  17 ;; GNU Emacs is free software; you can redistribute it and/or modify
  18 ;; it under the terms of the GNU General Public License as published by
  19 ;; the Free Software Foundation; either version 3, or (at your option)
  20 ;; any later version.
  21
  22 ;; GNU Emacs is distributed in the hope that it will be useful,
  23 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  24 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25 ;; GNU General Public License for more details.
  26
  27 ;; You should have received a copy of the GNU General Public License
  28 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  29 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  30 ;; Boston, MA 02110-1301, USA.
  31
  32 ;;; Commentary:
  33
  34 ;;; Code:
  35
  36 ;; Setting information of Thai characters.
  37
  38 (defconst lao-category-table (make-category-table))
  39 (define-category ?c "Lao consonant" lao-category-table)
  40 (define-category ?s "Lao semi-vowel" lao-category-table)
  41 (define-category ?v "Lao upper/lower vowel" lao-category-table)
  42 (define-category ?t "Lao tone" lao-category-table)
  43
  44 (let ((l '((?\e(1!\e(B consonant "LETTER KOR  KAI'" "CHICKEN")
  45            (?\e(1"\e(B consonant "LETTER KHOR KHAI'" "EGG")
  46            (?\e(1#\e(B invalid nil)
  47            (?\e(1$\e(B consonant "LETTER QHOR QHWARGN" "BUFFALO")
  48            (?\e(1%\e(B invalid nil)
  49            (?  invalid nil)
  50            (?\e(1'\e(B consonant "LETTER NGOR NGUU" "SNAKE")
  51            (?\e(1(\e(B consonant "LETTER JOR JUA" "BUDDHIST NOVICE")
  52            (?\e(1)\e(B invalid nil)
  53            (?\e(1*\e(B consonant "LETTER XOR X\"ARNG" "ELEPHANT")
  54            (?\e(1+\e(B invalid nil)
  55            (?\e(1,\e(B invalid nil)
  56            (?\e(1-\e(B consonant "LETTER YOR YUNG" "MOSQUITO")
  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(1.\e(B invalid nil)
  63            (?\e(14\e(B consonant "LETTER DOR DANG" "NOSE")
  64            (?\e(15\e(B consonant "LETTER TOR TAR" "EYE")
  65            (?\e(16\e(B consonant "LETTER THOR THUNG" "TO ASK,QUESTION")
  66            (?\e(17\e(B consonant "LETTER DHOR DHARM" "FLAG")
  67            (?\e(18\e(B invalid nil)
  68            (?\e(19\e(B consonant "LETTER NOR NOK" "BIRD")
  69            (?\e(1:\e(B consonant "LETTER BOR BED" "FISHHOOK")
  70            (?\e(1;\e(B consonant "LETTER POR PAR" "FISH")
  71            (?\e(1<\e(B consonant "LETTER HPOR HPER\"" "BEE")
  72            (?\e(1=\e(B consonant "LETTER FHOR FHAR" "WALL")
  73            (?\e(1>\e(B consonant "LETTER PHOR PHUU" "MOUNTAIN")
  74            (?\e(1?\e(B consonant "LETTER FOR FAI" "FIRE")
  75            (?\e(1@\e(B invalid nil)
  76            (?\e(1A\e(B consonant "LETTER MOR MAR\"" "HORSE")
  77            (?\e(1B\e(B consonant "LETTER GNOR GNAR" "MEDICINE")
  78            (?\e(1C\e(B consonant "LETTER ROR ROD" "CAR")
  79            (?\e(1D\e(B invalid nil)
  80            (?\e(1E\e(B consonant "LETTER LOR LIING" "MONKEY")
  81            (?\e(1F\e(B invalid nil)
  82            (?\e(1G\e(B consonant "LETTER WOR WII" "HAND FAN")
  83            (?\e(1H\e(B invalid nil)
  84            (?\e(1I\e(B invalid nil)
  85            (?\e(1J\e(B consonant "LETTER SOR SEA" "TIGER")
  86            (?\e(1K\e(B consonant "LETTER HHOR HHAI" "JAR")
  87            (?\e(1L\e(B invalid nil)
  88            (?\e(1M\e(B consonant "LETTER OR OOW" "TAKE")
  89            (?\e(1N\e(B consonant "LETTER HOR HEA" "BOAT")
  90            (?\e(1O\e(B special "ELLIPSIS")
  91            (?\e(1P\e(B vowel-base "VOWEL SIGN SARA A")
  92            (?\e(1Q\e(B vowel-upper "VOWEL SIGN MAI KAN")
  93            (?\e(1R\e(B vowel-base "VOWEL SIGN SARA AR")
  94            (?\e(1S\e(B vowel-base "VOWEL SIGN SARA AM")
  95            (?\e(1T\e(B vowel-upper "VOWEL SIGN SARA I")
  96            (?\e(1U\e(B vowel-upper "VOWEL SIGN SARA II")
  97            (?\e(1V\e(B vowel-upper "VOWEL SIGN SARA EU")
  98            (?\e(1W\e(B vowel-upper "VOWEL SIGN SARA UR")
  99            (?\e(1X\e(B vowel-lower "VOWEL SIGN SARA U")
 100            (?\e(1Y\e(B vowel-lower "VOWEL SIGN SARA UU")
 101            (?\e(1Z\e(B invalid nil)
 102            (?\e(1[\e(B vowel-upper "VOWEL SIGN MAI KONG")
 103            (?\e(1\\e(B semivowel-lower "SEMIVOWEL SIGN LO")
 104            (?\e(1]\e(B vowel-base "SEMIVOWEL SIGN SARA IA")
 105            (?\e(1^\e(B invalid nil)
 106            (?\e(1_\e(B invalid nil)
 107            (?\e(1`\e(B vowel-base "VOWEL SIGN SARA EE")
 108            (?\e(1a\e(B vowel-base "VOWEL SIGN SARA AA")
 109            (?\e(1b\e(B vowel-base "VOWEL SIGN SARA OO")
 110            (?\e(1c\e(B vowel-base "VOWEL SIGN SARA EI MAI MUAN\"")
 111            (?\e(1d\e(B vowel-base "VOWEL SIGN SARA AI MAI MAY")
 112            (?\e(1e\e(B invalid nil)
 113            (?\e(1f\e(B special "KO LA (REPETITION)")
 114            (?\e(1g\e(B invalid nil)
 115            (?\e(1h\e(B tone "TONE MAI EK")
 116            (?\e(1i\e(B tone "TONE MAI THO")
 117            (?\e(1j\e(B tone "TONE MAI TI")
 118            (?\e(1k\e(B tone "TONE MAI JADTAWAR")
 119            (?\e(1l\e(B tone "CANCELLATION MARK")
 120            (?\e(1m\e(B vowel-upper "VOWEL SIGN SARA OR")
 121            (?\e(1n\e(B invalid nil)
 122            (?\e(1o\e(B invalid nil)
 123            (?\e(1p\e(B special "DIGIT ZERO")
 124            (?\e(1q\e(B special "DIGIT ONE")
 125            (?\e(1r\e(B special "DIGIT TWO")
 126            (?\e(1s\e(B special "DIGIT THREE")
 127            (?\e(1t\e(B special "DIGIT FOUR")
 128            (?\e(1u\e(B special "DIGIT FIVE")
 129            (?\e(1v\e(B special "DIGIT SIX")
 130            (?\e(1w\e(B special "DIGIT SEVEN")
 131            (?\e(1x\e(B special "DIGIT EIGHT")
 132            (?\e(1y\e(B special "DIGIT NINE")
 133            (?\e(1z\e(B invalid nil)
 134            (?\e(1{\e(B invalid nil)
 135            (?\e(1|\e(B consonant "LETTER NHOR NHUU" "MOUSE")
 136            (?\e(1}\e(B consonant "LETTER MHOR MHAR" "DOG")
 137            (?\e(1~\e(B invalid nil)))
 138       elm)
 139   (while l
 140     (setq elm (car l) l (cdr l))
 141     (let ((char (car elm))
 142           (ptype (nth 1 elm)))
 143       (cond ((eq ptype 'consonant)
 144              (modify-category-entry char ?c lao-category-table))
 145             ((memq ptype '(vowel-upper vowel-lower))
 146              (modify-category-entry char ?v lao-category-table))
 147             ((eq ptype 'semivowel-lower)
 148              (modify-category-entry char ?s lao-category-table))
 149             ((eq ptype 'tone)
 150              (modify-category-entry char ?t lao-category-table)))
 151       (put-char-code-property char 'phonetic-type ptype)
 152       (put-char-code-property char 'name (nth 2 elm))
 153       (put-char-code-property char 'meaning (nth 3 elm)))))
 154
 155 ;; The general composing rules are as follows:
 156 ;;
 157 ;;                          T
 158 ;;       V        T         V                  T
 159 ;; CV -> C, CT -> C, CVT -> C, Cv -> C, CvT -> C
 160 ;;                                   v         v
 161 ;;                             T
 162 ;;        V         T          V                    T
 163 ;; CsV -> C, CsT -> C, CsVT -> C, Csv -> C, CsvT -> C
 164 ;;        s         s          s         s          s
 165 ;;                                       v          v
 166
 167
 168 ;; where C: consonant, V: vowel upper, v: vowel lower,
 169 ;;       T: tone mark, s: semivowel lower
 170
 171 (defvar lao-composition-pattern
 172   "\\cc\\(\\ct\\|\\cv\\ct?\\|\\cs\\(\\ct\\|\\cv\\ct?\\)?\\)"
 173   "Regular expression matching a Lao composite sequence.")
 174
 175 ;;;###autoload
 176 (defun lao-compose-string (str)
 177   (with-category-table lao-category-table
 178    (let ((idx 0))
 179      (while (setq idx (string-match lao-composition-pattern str idx))
 180        (compose-string str idx (match-end 0))
 181        (setq idx (match-end 0))))
 182    str))
 183
 184 ;;; LRT: Lao <-> Roman Transcription
 185
 186 ;; Upper vowels and tone-marks are put on the letter.
 187 ;; Semi-vowel-sign-lo and lower vowels are put under the letter.
 188
 189 (defconst lao-transcription-consonant-alist
 190   (sort '(;; single consonants
 191           ("k" . "\e(1!\e(B")
 192           ("kh" . "\e(1"\e(B")
 193           ("qh" . "\e(1$\e(B")
 194           ("ng" . "\e(1'\e(B")
 195           ("j" . "\e(1(\e(B")
 196           ("s" . "\e(1J\e(B")
 197           ("x" . "\e(1*\e(B")
 198           ("y" . "\e(1-\e(B")
 199           ("d" . "\e(14\e(B")
 200           ("t" . "\e(15\e(B")
 201           ("th" . "\e(16\e(B")
 202           ("dh" . "\e(17\e(B")
 203           ("n" . "\e(19\e(B")
 204           ("b" . "\e(1:\e(B")
 205           ("p" . "\e(1;\e(B")
 206           ("hp" . "\e(1<\e(B")
 207           ("fh" . "\e(1=\e(B")
 208           ("ph" . "\e(1>\e(B")
 209           ("f" . "\e(1?\e(B")
 210           ("m" . "\e(1A\e(B")
 211           ("gn" . "\e(1B\e(B")
 212           ("l" . "\e(1E\e(B")
 213           ("r" . "\e(1C\e(B")
 214           ("v" . "\e(1G\e(B")
 215           ("w" . "\e(1G\e(B")
 216           ("hh" . "\e(1K\e(B")
 217           ("O" . "\e(1M\e(B")
 218           ("h" . "\e(1N\e(B")
 219           ("nh" . "\e(1|\e(B")
 220           ("mh" . "\e(1}\e(B")
 221           ("lh" . ["\e(1K\\e(B"])
 222           ;; double consonants
 223           ("ngh" . ["\e(1K'\e(B"])
 224           ("yh" . ["\e(1K]\e(B"])
 225           ("wh" . ["\e(1KG\e(B"])
 226           ("hl" . ["\e(1KE\e(B"])
 227           ("hy" . ["\e(1K-\e(B"])
 228           ("hn" . ["\e(1K9\e(B"])
 229           ("hm" . ["\e(1KA\e(B"])
 230           )
 231         (function (lambda (x y) (> (length (car x)) (length (car y)))))))
 232
 233 (defconst lao-transcription-semi-vowel-alist
 234   '(("r" . "\e(1\\e(B")))
 235
 236 (defconst lao-transcription-vowel-alist
 237   (sort '(("a" . "\e(1P\e(B")
 238           ("ar" . "\e(1R\e(B")
 239           ("i" . "\e(1T\e(B")
 240           ("ii" . "\e(1U\e(B")
 241           ("eu" . "\e(1V\e(B")
 242           ("ur" . "\e(1W\e(B")
 243           ("u" . "\e(1X\e(B")
 244           ("uu" . "\e(1Y\e(B")
 245           ("e" . ["\e(1`P\e(B"])
 246           ("ee" . "\e(1`\e(B")
 247           ("ae" . ["\e(1aP\e(B"])
 248           ("aa" . "\e(1a\e(B")
 249           ("o" . ["\e(1bP\e(B"])
 250           ("oo" . "\e(1b\e(B")
 251           ("oe" . ["\e(1`RP\e(B"])
 252           ("or" . "\e(1m\e(B")
 253           ("er" . ["\e(1`T\e(B"])
 254           ("ir" . ["\e(1`U\e(B"])
 255           ("ua" . ["\e(1[GP\e(B"])
 256           ("uaa" . ["\e(1[G\e(B"])
 257           ("ie" . ["\e(1`Q]P\e(B"])
 258           ("ia" . ["\e(1`Q]\e(B"])
 259           ("ea" . ["\e(1`VM\e(B"])
 260           ("eaa" . ["\e(1`WM\e(B"])
 261           ("ai" . "\e(1d\e(B")
 262           ("ei" . "\e(1c\e(B")
 263           ("ao" . ["\e(1`[R\e(B"])
 264           ("aM" . "\e(1S\e(B"))
 265         (function (lambda (x y) (> (length (car x)) (length (car y)))))))
 266
 267 ;; Maa-sakod is put at the tail.
 268 (defconst lao-transcription-maa-sakod-alist
 269   '(("k" . "\e(1!\e(B")
 270     ("g" . "\e(1'\e(B")
 271     ("y" . "\e(1-\e(B")
 272     ("d" . "\e(14\e(B")
 273     ("n" . "\e(19\e(B")
 274     ("b" . "\e(1:\e(B")
 275     ("m" . "\e(1A\e(B")
 276     ("v" . "\e(1G\e(B")
 277     ("w" . "\e(1G\e(B")
 278     ))
 279
 280 (defconst lao-transcription-tone-alist
 281   '(("'" . "\e(1h\e(B")
 282     ("\"" . "\e(1i\e(B")
 283     ("^" . "\e(1j\e(B")
 284     ("+" . "\e(1k\e(B")
 285     ("~" . "\e(1l\e(B")))
 286
 287 (defconst lao-transcription-punctuation-alist
 288   '(("\\0" . "\e(1p\e(B")
 289     ("\\1" . "\e(1q\e(B")
 290     ("\\2" . "\e(1r\e(B")
 291     ("\\3" . "\e(1s\e(B")
 292     ("\\4" . "\e(1t\e(B")
 293     ("\\5" . "\e(1u\e(B")
 294     ("\\6" . "\e(1v\e(B")
 295     ("\\7" . "\e(1w\e(B")
 296     ("\\8" . "\e(1x\e(B")
 297     ("\\9" . "\e(1y\e(B")
 298     ("\\\\" . "\e(1f\e(B")
 299     ("\\$" . "\e(1O\e(B")))
 300
 301 (defconst lao-transcription-pattern
 302   (concat
 303    "\\("
 304    (mapconcat 'car lao-transcription-consonant-alist "\\|")
 305    "\\)\\("
 306    (mapconcat 'car lao-transcription-semi-vowel-alist "\\|")
 307    "\\)?\\(\\("
 308    (mapconcat 'car lao-transcription-vowel-alist "\\|")
 309    "\\)\\("
 310    (mapconcat 'car lao-transcription-maa-sakod-alist "\\|")
 311    "\\)?\\("
 312    (mapconcat (lambda (x) (regexp-quote (car x)))
 313               lao-transcription-tone-alist "\\|")
 314    "\\)?\\)?\\|"
 315    (mapconcat (lambda (x) (regexp-quote (car x)))
 316               lao-transcription-punctuation-alist "\\|")
 317    )
 318   "Regexp of Roman transcription pattern for one Lao syllable.")
 319
 320 (defconst lao-transcription-pattern
 321   (concat
 322    "\\("
 323    (regexp-opt (mapcar 'car lao-transcription-consonant-alist))
 324    "\\)\\("
 325    (regexp-opt (mapcar 'car lao-transcription-semi-vowel-alist))
 326    "\\)?\\(\\("
 327    (regexp-opt (mapcar 'car lao-transcription-vowel-alist))
 328    "\\)\\("
 329    (regexp-opt (mapcar 'car lao-transcription-maa-sakod-alist))
 330    "\\)?\\("
 331    (regexp-opt (mapcar 'car lao-transcription-tone-alist))
 332    "\\)?\\)?\\|"
 333    (regexp-opt (mapcar 'car lao-transcription-punctuation-alist))
 334    )
 335   "Regexp of Roman transcription pattern for one Lao syllable.")
 336
 337 (defconst lao-vowel-reordering-rule
 338   '(("\e(1P\e(B" (0 ?\e(1P\e(B) (0 ?\e(1Q\e(B))
 339     ("\e(1R\e(B" (0 ?\e(1R\e(B))
 340     ("\e(1T\e(B" (0 ?\e(1U\e(B))
 341     ("\e(1U\e(B" (0 ?\e(1U\e(B))
 342     ("\e(1V\e(B" (0 ?\e(1V\e(B))
 343     ("\e(1W\e(B" (0 ?\e(1W\e(B))
 344     ("\e(1X\e(B" (0 ?\e(1X\e(B))
 345     ("\e(1Y\e(B" (0 ?\e(1Y\e(B))
 346     ("\e(1`P\e(B" (?\e(1`\e(B 0 ?\e(1P\e(B) (?\e(1`\e(B 0 ?\e(1Q\e(B))
 347     ("\e(1`\e(B" (?\e(1`\e(B 0))
 348     ("\e(1aP\e(B" (?\e(1a\e(B 0 ?\e(1P\e(B) (?\e(1a\e(B 0 ?\e(1Q\e(B))
 349     ("\e(1a\e(B" (?\e(1a\e(B 0))
 350     ("\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))
 351     ("\e(1b\e(B" (?\e(1b\e(B 0))
 352     ("\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))
 353     ("\e(1m\e(B" (0 ?\e(1m\e(B) (0 ?\e(1M\e(B))
 354     ("\e(1`T\e(B" (?\e(1`\e(B 0 ?\e(1T\e(B))
 355     ("\e(1`U\e(B" (?\e(1`\e(B 0 ?\e(1U\e(B))
 356     ("\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))
 357     ("\e(1[G\e(B" (0 ?\e(1[\e(B ?\e(1G\e(B) (0 ?\e(1G\e(B))
 358     ("\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))
 359     ("\e(1`Q]\e(B" (?\e(1`\e(B 0 ?\e(1Q\e(B ?\e(1]\e(B) (0 ?\e(1]\e(B))
 360     ("\e(1`VM\e(B" (?\e(1`\e(B 0 ?\e(1V\e(B ?\e(1M\e(B))
 361     ("\e(1`WM\e(B" (?\e(1`\e(B 0 ?\e(1W\e(B ?\e(1M\e(B))
 362     ("\e(1d\e(B" (?\e(1d\e(B 0))
 363     ("\e(1c\e(B" (?\e(1c\e(B 0))
 364     ("\e(1`[R\e(B" (?\e(1`\e(B 0 ?\e(1[\e(B ?\e(1R\e(B))
 365     ("\e(1S\e(B" (0 ?\e(1S\e(B)))
 366   "Alist of Lao vowel string vs the corresponding re-ordering rule.
 367 Each element has this form:
 368         (VOWEL NO-MAA-SAKOD-RULE WITH-MAA-SAKOD-RULE (MAA-SAKOD-0 RULE-0) ...)
 369
 370 VOWEL is a vowel string (e.g. \"\e(1`Q]P\e(B\").
 371
 372 NO-MAA-SAKOD-RULE is a rule to re-order and modify VOWEL following a
 373 consonant.  It is a list vowel characters or 0.  The element 0
 374 indicate the place to embed a consonant.
 375
 376 Optional WITH-MAA-SAKOD-RULE is a rule to re-order and modify VOWEL
 377 follwoing a consonant and preceding a maa-sakod character.  If it is
 378 nil, NO-MAA-SAKOD-RULE is used.  The maa-sakod character is alwasy
 379 appended at the tail.
 380
 381 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
 382 string following a consonant `\e(1!\e(B' should be re-ordered as \"\e(1`!WM\e(B\".
 383
 384 Optional (MAA-SAKOD-n RULE-n) are rules specially applied to maa-sakod
 385 character MAA-SAKOD-n.")
 386
 387 ;;;###autoload
 388 (defun lao-transcribe-single-roman-syllable-to-lao (from to &optional str)
 389   "Transcribe a Romanized Lao syllable in the region FROM and TO to Lao string.
 390 Only the first syllable is transcribed.
 391 The value has the form: (START END LAO-STRING), where
 392 START and END are the beggining and end positions of the Roman Lao syllable,
 393 LAO-STRING is the Lao character transcription of it.
 394
 395 Optional 3rd arg STR, if non-nil, is a string to search for Roman Lao
 396 syllable.  In that case, FROM and TO are indexes to STR."
 397   (if str
 398       (if (setq from (string-match lao-transcription-pattern str from))
 399           (progn
 400             (if (>= from to)
 401                 (setq from nil)
 402               (setq to (match-end 0)))))
 403     (save-excursion
 404       (goto-char from)
 405       (if (setq to (re-search-forward lao-transcription-pattern to t))
 406           (setq from (match-beginning 0))
 407         (setq from nil))))
 408   (if from
 409       (let* ((consonant (match-string 1 str))
 410              (semivowel (match-string 3 str))
 411              (vowel (match-string 5 str))
 412              (maa-sakod (match-string 8 str))
 413              (tone (match-string 9 str))
 414              lao-consonant lao-semivowel lao-vowel lao-maa-sakod lao-tone
 415              clen cidx)
 416         (setq to (match-end 0))
 417         (if (not consonant)
 418             (setq str (cdr (assoc (match-string 0 str)
 419                                   lao-transcription-punctuation-alist)))
 420           (setq lao-consonant
 421                 (cdr (assoc consonant lao-transcription-consonant-alist)))
 422           (if (vectorp lao-consonant)
 423               (setq lao-consonant (aref lao-consonant 0)))
 424           (setq clen (length lao-consonant))
 425           (if semivowel
 426               ;; Include semivowel in STR.
 427               (setq lao-semivowel
 428                     (cdr (assoc semivowel lao-transcription-semi-vowel-alist))
 429                     str (if (= clen 1)
 430                             (concat lao-consonant lao-semivowel)
 431                           (concat (substring lao-consonant 0 1) lao-semivowel
 432                                   (substring lao-consonant 1))))
 433             (setq str lao-consonant))
 434           (if vowel
 435               (let (rule)
 436                 (setq lao-vowel
 437                       (cdr (assoc vowel lao-transcription-vowel-alist)))
 438                 (if (vectorp lao-vowel)
 439                     (setq lao-vowel (aref lao-vowel 0)))
 440                 (setq rule (assoc lao-vowel lao-vowel-reordering-rule))
 441                 (if (null maa-sakod)
 442                     (setq rule (nth 1 rule))
 443                   (setq lao-maa-sakod
 444                         (cdr (assoc maa-sakod lao-transcription-maa-sakod-alist))
 445                         rule
 446                         (or (cdr (assq (aref lao-maa-sakod 0) (nthcdr 2 rule)))
 447                             (nth 2 rule)
 448                             (nth 1 rule))))
 449                 (or rule
 450                     (error "Lao vowel %S has no re-ordering rule" lao-vowel))
 451                 (setq lao-consonant str str "")
 452                 (while rule
 453                   (if (= (car rule) 0)
 454                       (setq str (concat str lao-consonant)
 455                             cidx (length str))
 456                     (setq str (concat str (list (car rule)))))
 457                   (setq rule (cdr rule)))
 458                 (or cidx
 459                     (error "Lao vowel %S has malformed re-ordering rule" vowel))
 460                 ;; Set CIDX to after upper or lower vowel if any.
 461                 (let ((len (length str)))
 462                   (while (and (< cidx len)
 463                               (memq (get-char-code-property (aref str cidx)
 464                                                             'phonetic-type)
 465                                     '(vowel-lower vowel-upper)))
 466                     (setq cidx (1+ cidx))))
 467                 (if lao-maa-sakod
 468                     (setq str (concat str lao-maa-sakod)))
 469                 (if tone
 470                     (setq lao-tone
 471                           (cdr (assoc tone lao-transcription-tone-alist))
 472                           str (concat (substring str 0 cidx) lao-tone
 473                                       (substring str cidx)))))))
 474         (list from to (lao-compose-string str)))))
 475
 476 ;;;###autoload
 477 (defun lao-transcribe-roman-to-lao-string (str)
 478   "Transcribe Romanized Lao string STR to Lao character string."
 479   (let ((from 0)
 480         (to (length str))
 481         (lao-str "")
 482         val)
 483     (while (setq val (lao-transcribe-single-roman-syllable-to-lao from to str))
 484       (let ((start (car val))
 485             (end (nth 1 val))
 486             (lao (nth 2 val)))
 487         (if (> start from)
 488             (setq lao-str (concat lao-str (substring str from start) lao))
 489           (setq lao-str (concat lao-str lao)))
 490         (setq from end)))
 491     (if (< from to)
 492         (concat lao-str (substring str from to))
 493       lao-str)))
 494
 495 ;;;###autoload
 496 (defun lao-composition-function (from to font-object string)
 497   (or (and font-object
 498            (font-shape-text from to font-object string))
 499       (with-category-table lao-category-table
 500         (if string
 501             (if (eq (string-match lao-composition-pattern string from) to)
 502                 (prog1 (match-end 0)
 503                   (compose-string string from (match-end 0))))
 504           (save-excursion
 505             (goto-char from)
 506             (if (looking-at lao-composition-pattern)
 507                 (prog1 (match-end 0)
 508                   (compose-region from (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