[bpt/emacs.git] / lisp / language / lao-util.el

;;; lao-util.el --- utilities for Lao -*- coding: iso-2022-7bit; -*-

;; Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
;;   Free Software Foundation, Inc.
;; Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
;;   2007, 2008
;;   National Institute of Advanced Industrial Science and Technology (AIST)
;;   Registration Number H14PRO021
;; Copyright (C) 2003
;;   National Institute of Advanced Industrial Science and Technology (AIST)
;;   Registration Number H13PRO009

;; Keywords: multilingual, Lao, i18n

;; 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 3, 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., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Commentary:

;;; Code:

;; Setting information of Thai characters.

(defconst lao-category-table (make-category-table))
(define-category ?c "Lao consonant" lao-category-table)
(define-category ?s "Lao semi-vowel" lao-category-table)
(define-category ?v "Lao upper/lower vowel" lao-category-table)
(define-category ?t "Lao tone" lao-category-table)

(let ((l '((?\e(1!\e(B consonant "LETTER KOR  KAI'" "CHICKEN")
	   (?\e(1"\e(B consonant "LETTER KHOR KHAI'" "EGG")
	   (?\e(1#\e(B invalid nil)
	   (?\e(1$\e(B consonant "LETTER QHOR QHWARGN" "BUFFALO")
	   (?\e(1%\e(B invalid nil)
	   (?  invalid nil)
	   (?\e(1'\e(B consonant "LETTER NGOR NGUU" "SNAKE")
	   (?\e(1(\e(B consonant "LETTER JOR JUA" "BUDDHIST NOVICE")
	   (?\e(1)\e(B invalid nil)
	   (?\e(1*\e(B consonant "LETTER XOR X\"ARNG" "ELEPHANT")
	   (?\e(1+\e(B invalid nil)
	   (?\e(1,\e(B invalid nil)
	   (?\e(1-\e(B consonant "LETTER YOR YUNG" "MOSQUITO")
	   (?\e(1.\e(B invalid nil)
	   (?\e(1.\e(B invalid nil)
	   (?\e(1.\e(B invalid nil)
	   (?\e(1.\e(B invalid nil)
	   (?\e(1.\e(B invalid nil)
	   (?\e(1.\e(B invalid nil)
	   (?\e(14\e(B consonant "LETTER DOR DANG" "NOSE")
	   (?\e(15\e(B consonant "LETTER TOR TAR" "EYE")
	   (?\e(16\e(B consonant "LETTER THOR THUNG" "TO ASK,QUESTION")
	   (?\e(17\e(B consonant "LETTER DHOR DHARM" "FLAG")
	   (?\e(18\e(B invalid nil)
	   (?\e(19\e(B consonant "LETTER NOR NOK" "BIRD")
	   (?\e(1:\e(B consonant "LETTER BOR BED" "FISHHOOK")
	   (?\e(1;\e(B consonant "LETTER POR PAR" "FISH")
	   (?\e(1<\e(B consonant "LETTER HPOR HPER\"" "BEE")
	   (?\e(1=\e(B consonant "LETTER FHOR FHAR" "WALL")
	   (?\e(1>\e(B consonant "LETTER PHOR PHUU" "MOUNTAIN")
	   (?\e(1?\e(B consonant "LETTER FOR FAI" "FIRE")
	   (?\e(1@\e(B invalid nil)
	   (?\e(1A\e(B consonant "LETTER MOR MAR\"" "HORSE")
	   (?\e(1B\e(B consonant "LETTER GNOR GNAR" "MEDICINE")
	   (?\e(1C\e(B consonant "LETTER ROR ROD" "CAR")
	   (?\e(1D\e(B invalid nil)
	   (?\e(1E\e(B consonant "LETTER LOR LIING" "MONKEY")
	   (?\e(1F\e(B invalid nil)
	   (?\e(1G\e(B consonant "LETTER WOR WII" "HAND FAN")
	   (?\e(1H\e(B invalid nil)
	   (?\e(1I\e(B invalid nil)
	   (?\e(1J\e(B consonant "LETTER SOR SEA" "TIGER")
	   (?\e(1K\e(B consonant "LETTER HHOR HHAI" "JAR")
	   (?\e(1L\e(B invalid nil)
	   (?\e(1M\e(B consonant "LETTER OR OOW" "TAKE")
	   (?\e(1N\e(B consonant "LETTER HOR HEA" "BOAT")
	   (?\e(1O\e(B special "ELLIPSIS")
	   (?\e(1P\e(B vowel-base "VOWEL SIGN SARA A")
	   (?\e(1Q\e(B vowel-upper "VOWEL SIGN MAI KAN")
	   (?\e(1R\e(B vowel-base "VOWEL SIGN SARA AR")
	   (?\e(1S\e(B vowel-base "VOWEL SIGN SARA AM")
	   (?\e(1T\e(B vowel-upper "VOWEL SIGN SARA I")
	   (?\e(1U\e(B vowel-upper "VOWEL SIGN SARA II")
	   (?\e(1V\e(B vowel-upper "VOWEL SIGN SARA EU")
	   (?\e(1W\e(B vowel-upper "VOWEL SIGN SARA UR")
	   (?\e(1X\e(B vowel-lower "VOWEL SIGN SARA U")
	   (?\e(1Y\e(B vowel-lower "VOWEL SIGN SARA UU")
	   (?\e(1Z\e(B invalid nil)
	   (?\e(1[\e(B vowel-upper "VOWEL SIGN MAI KONG")
	   (?\e(1\\e(B semivowel-lower "SEMIVOWEL SIGN LO")
	   (?\e(1]\e(B vowel-base "SEMIVOWEL SIGN SARA IA")
	   (?\e(1^\e(B invalid nil)
	   (?\e(1_\e(B invalid nil)
	   (?\e(1`\e(B vowel-base "VOWEL SIGN SARA EE")
	   (?\e(1a\e(B vowel-base "VOWEL SIGN SARA AA")
	   (?\e(1b\e(B vowel-base "VOWEL SIGN SARA OO")
	   (?\e(1c\e(B vowel-base "VOWEL SIGN SARA EI MAI MUAN\"")
	   (?\e(1d\e(B vowel-base "VOWEL SIGN SARA AI MAI MAY")
	   (?\e(1e\e(B invalid nil)
	   (?\e(1f\e(B special "KO LA (REPETITION)")
	   (?\e(1g\e(B invalid nil)
	   (?\e(1h\e(B tone "TONE MAI EK")
	   (?\e(1i\e(B tone "TONE MAI THO")
	   (?\e(1j\e(B tone "TONE MAI TI")
	   (?\e(1k\e(B tone "TONE MAI JADTAWAR")
	   (?\e(1l\e(B tone "CANCELLATION MARK")
	   (?\e(1m\e(B vowel-upper "VOWEL SIGN SARA OR")
	   (?\e(1n\e(B invalid nil)
	   (?\e(1o\e(B invalid nil)
	   (?\e(1p\e(B special "DIGIT ZERO")
	   (?\e(1q\e(B special "DIGIT ONE")
	   (?\e(1r\e(B special "DIGIT TWO")
	   (?\e(1s\e(B special "DIGIT THREE")
	   (?\e(1t\e(B special "DIGIT FOUR")
	   (?\e(1u\e(B special "DIGIT FIVE")
	   (?\e(1v\e(B special "DIGIT SIX")
	   (?\e(1w\e(B special "DIGIT SEVEN")
	   (?\e(1x\e(B special "DIGIT EIGHT")
	   (?\e(1y\e(B special "DIGIT NINE")
	   (?\e(1z\e(B invalid nil)
	   (?\e(1{\e(B invalid nil)
	   (?\e(1|\e(B consonant "LETTER NHOR NHUU" "MOUSE")
	   (?\e(1}\e(B consonant "LETTER MHOR MHAR" "DOG")
	   (?\e(1~\e(B invalid nil)))
      elm)
  (while l
    (setq elm (car l) l (cdr l))
    (let ((char (car elm))
	  (ptype (nth 1 elm)))
      (cond ((eq ptype 'consonant)
	     (modify-category-entry char ?c lao-category-table))
	    ((memq ptype '(vowel-upper vowel-lower))
	     (modify-category-entry char ?v lao-category-table))
	    ((eq ptype 'semivowel-lower)
	     (modify-category-entry char ?s lao-category-table))
	    ((eq ptype 'tone)
	     (modify-category-entry char ?t lao-category-table)))
      (put-char-code-property char 'phonetic-type ptype)
      (put-char-code-property char 'name (nth 2 elm))
      (put-char-code-property char 'meaning (nth 3 elm)))))

;; The general composing rules are as follows:
;;
;;                          T
;;       V        T         V                  T
;; CV -> C, CT -> C, CVT -> C, Cv -> C, CvT -> C
;;                                   v         v
;;                             T
;;        V         T          V                    T
;; CsV -> C, CsT -> C, CsVT -> C, Csv -> C, CsvT -> C
;;        s         s          s         s          s
;;                                       v          v


;; where C: consonant, V: vowel upper, v: vowel lower,
;;       T: tone mark, s: semivowel lower

(defvar lao-composition-pattern
  "\\cc\\(\\ct\\|\\cv\\ct?\\|\\cs\\(\\ct\\|\\cv\\ct?\\)?\\)"
  "Regular expression matching a Lao composite sequence.")

;;;###autoload
(defun lao-compose-string (str)
  (with-category-table lao-category-table
   (let ((idx 0))
     (while (setq idx (string-match lao-composition-pattern str idx))
       (compose-string str idx (match-end 0))
       (setq idx (match-end 0))))
   str))

;;; LRT: Lao <-> Roman Transcription

;; Upper vowels and tone-marks are put on the letter.
;; Semi-vowel-sign-lo and lower vowels are put under the letter.

(defconst lao-transcription-consonant-alist
  (sort '(;; single consonants
	  ("k" . "\e(1!\e(B")
	  ("kh" . "\e(1"\e(B")
	  ("qh" . "\e(1$\e(B")
	  ("ng" . "\e(1'\e(B")
	  ("j" . "\e(1(\e(B")
	  ("s" . "\e(1J\e(B")
	  ("x" . "\e(1*\e(B")
	  ("y" . "\e(1-\e(B")
	  ("d" . "\e(14\e(B")
	  ("t" . "\e(15\e(B")
	  ("th" . "\e(16\e(B")
	  ("dh" . "\e(17\e(B")
	  ("n" . "\e(19\e(B")
	  ("b" . "\e(1:\e(B")
	  ("p" . "\e(1;\e(B")
	  ("hp" . "\e(1<\e(B")
	  ("fh" . "\e(1=\e(B")
	  ("ph" . "\e(1>\e(B")
	  ("f" . "\e(1?\e(B")
	  ("m" . "\e(1A\e(B")
	  ("gn" . "\e(1B\e(B")
	  ("l" . "\e(1E\e(B")
	  ("r" . "\e(1C\e(B")
	  ("v" . "\e(1G\e(B")
	  ("w" . "\e(1G\e(B")
	  ("hh" . "\e(1K\e(B")
	  ("O" . "\e(1M\e(B")
	  ("h" . "\e(1N\e(B")
	  ("nh" . "\e(1|\e(B")
	  ("mh" . "\e(1}\e(B")
	  ("lh" . ["\e(1K\\e(B"])
	  ;; double consonants
	  ("ngh" . ["\e(1K'\e(B"])
	  ("yh" . ["\e(1K]\e(B"])
	  ("wh" . ["\e(1KG\e(B"])
	  ("hl" . ["\e(1KE\e(B"])
	  ("hy" . ["\e(1K-\e(B"])
	  ("hn" . ["\e(1K9\e(B"])
	  ("hm" . ["\e(1KA\e(B"])
	  )
	(function (lambda (x y) (> (length (car x)) (length (car y)))))))

(defconst lao-transcription-semi-vowel-alist
  '(("r" . "\e(1\\e(B")))

(defconst lao-transcription-vowel-alist
  (sort '(("a" . "\e(1P\e(B")
	  ("ar" . "\e(1R\e(B")
	  ("i" . "\e(1T\e(B")
	  ("ii" . "\e(1U\e(B")
	  ("eu" . "\e(1V\e(B")
	  ("ur" . "\e(1W\e(B")
	  ("u" . "\e(1X\e(B")
	  ("uu" . "\e(1Y\e(B")
	  ("e" . ["\e(1`P\e(B"])
	  ("ee" . "\e(1`\e(B")
	  ("ae" . ["\e(1aP\e(B"])
	  ("aa" . "\e(1a\e(B")
	  ("o" . ["\e(1bP\e(B"])
	  ("oo" . "\e(1b\e(B")
	  ("oe" . ["\e(1`RP\e(B"])
	  ("or" . "\e(1m\e(B")
	  ("er" . ["\e(1`T\e(B"])
	  ("ir" . ["\e(1`U\e(B"])
	  ("ua" . ["\e(1[GP\e(B"])
	  ("uaa" . ["\e(1[G\e(B"])
	  ("ie" . ["\e(1`Q]P\e(B"])
	  ("ia" . ["\e(1`Q]\e(B"])
	  ("ea" . ["\e(1`VM\e(B"])
	  ("eaa" . ["\e(1`WM\e(B"])
	  ("ai" . "\e(1d\e(B")
	  ("ei" . "\e(1c\e(B")
	  ("ao" . ["\e(1`[R\e(B"])
	  ("aM" . "\e(1S\e(B"))
	(function (lambda (x y) (> (length (car x)) (length (car y)))))))

;; Maa-sakod is put at the tail.
(defconst lao-transcription-maa-sakod-alist
  '(("k" . "\e(1!\e(B")
    ("g" . "\e(1'\e(B")
    ("y" . "\e(1-\e(B")
    ("d" . "\e(14\e(B")
    ("n" . "\e(19\e(B")
    ("b" . "\e(1:\e(B")
    ("m" . "\e(1A\e(B")
    ("v" . "\e(1G\e(B")
    ("w" . "\e(1G\e(B")
    ))

(defconst lao-transcription-tone-alist
  '(("'" . "\e(1h\e(B")
    ("\"" . "\e(1i\e(B")
    ("^" . "\e(1j\e(B")
    ("+" . "\e(1k\e(B")
    ("~" . "\e(1l\e(B")))

(defconst lao-transcription-punctuation-alist
  '(("\\0" . "\e(1p\e(B")
    ("\\1" . "\e(1q\e(B")
    ("\\2" . "\e(1r\e(B")
    ("\\3" . "\e(1s\e(B")
    ("\\4" . "\e(1t\e(B")
    ("\\5" . "\e(1u\e(B")
    ("\\6" . "\e(1v\e(B")
    ("\\7" . "\e(1w\e(B")
    ("\\8" . "\e(1x\e(B")
    ("\\9" . "\e(1y\e(B")
    ("\\\\" . "\e(1f\e(B")
    ("\\$" . "\e(1O\e(B")))

(defconst lao-transcription-pattern
  (concat
   "\\("
   (mapconcat 'car lao-transcription-consonant-alist "\\|")
   "\\)\\("
   (mapconcat 'car lao-transcription-semi-vowel-alist "\\|")
   "\\)?\\(\\("
   (mapconcat 'car lao-transcription-vowel-alist "\\|")
   "\\)\\("
   (mapconcat 'car lao-transcription-maa-sakod-alist "\\|")
   "\\)?\\("
   (mapconcat (lambda (x) (regexp-quote (car x)))
	      lao-transcription-tone-alist "\\|")
   "\\)?\\)?\\|"
   (mapconcat (lambda (x) (regexp-quote (car x)))
	      lao-transcription-punctuation-alist "\\|")
   )
  "Regexp of Roman transcription pattern for one Lao syllable.")

(defconst lao-transcription-pattern
  (concat
   "\\("
   (regexp-opt (mapcar 'car lao-transcription-consonant-alist))
   "\\)\\("
   (regexp-opt (mapcar 'car lao-transcription-semi-vowel-alist))
   "\\)?\\(\\("
   (regexp-opt (mapcar 'car lao-transcription-vowel-alist))
   "\\)\\("
   (regexp-opt (mapcar 'car lao-transcription-maa-sakod-alist))
   "\\)?\\("
   (regexp-opt (mapcar 'car lao-transcription-tone-alist))
   "\\)?\\)?\\|"
   (regexp-opt (mapcar 'car lao-transcription-punctuation-alist))
   )
  "Regexp of Roman transcription pattern for one Lao syllable.")

(defconst lao-vowel-reordering-rule
  '(("\e(1P\e(B" (0 ?\e(1P\e(B) (0 ?\e(1Q\e(B))
    ("\e(1R\e(B" (0 ?\e(1R\e(B))
    ("\e(1T\e(B" (0 ?\e(1U\e(B))
    ("\e(1U\e(B" (0 ?\e(1U\e(B))
    ("\e(1V\e(B" (0 ?\e(1V\e(B))
    ("\e(1W\e(B" (0 ?\e(1W\e(B))
    ("\e(1X\e(B" (0 ?\e(1X\e(B))
    ("\e(1Y\e(B" (0 ?\e(1Y\e(B))
    ("\e(1`P\e(B" (?\e(1`\e(B 0 ?\e(1P\e(B) (?\e(1`\e(B 0 ?\e(1Q\e(B))
    ("\e(1`\e(B" (?\e(1`\e(B 0))
    ("\e(1aP\e(B" (?\e(1a\e(B 0 ?\e(1P\e(B) (?\e(1a\e(B 0 ?\e(1Q\e(B))
    ("\e(1a\e(B" (?\e(1a\e(B 0))
    ("\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))
    ("\e(1b\e(B" (?\e(1b\e(B 0))
    ("\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))
    ("\e(1m\e(B" (0 ?\e(1m\e(B) (0 ?\e(1M\e(B))
    ("\e(1`T\e(B" (?\e(1`\e(B 0 ?\e(1T\e(B))
    ("\e(1`U\e(B" (?\e(1`\e(B 0 ?\e(1U\e(B))
    ("\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))
    ("\e(1[G\e(B" (0 ?\e(1[\e(B ?\e(1G\e(B) (0 ?\e(1G\e(B))
    ("\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))
    ("\e(1`Q]\e(B" (?\e(1`\e(B 0 ?\e(1Q\e(B ?\e(1]\e(B) (0 ?\e(1]\e(B))
    ("\e(1`VM\e(B" (?\e(1`\e(B 0 ?\e(1V\e(B ?\e(1M\e(B))
    ("\e(1`WM\e(B" (?\e(1`\e(B 0 ?\e(1W\e(B ?\e(1M\e(B))
    ("\e(1d\e(B" (?\e(1d\e(B 0))
    ("\e(1c\e(B" (?\e(1c\e(B 0))
    ("\e(1`[R\e(B" (?\e(1`\e(B 0 ?\e(1[\e(B ?\e(1R\e(B))
    ("\e(1S\e(B" (0 ?\e(1S\e(B)))
  "Alist of Lao vowel string vs the corresponding re-ordering rule.
Each element has this form:
	(VOWEL NO-MAA-SAKOD-RULE WITH-MAA-SAKOD-RULE (MAA-SAKOD-0 RULE-0) ...)

VOWEL is a vowel string (e.g. \"\e(1`Q]P\e(B\").

NO-MAA-SAKOD-RULE is a rule to re-order and modify VOWEL following a
consonant.  It is a list vowel characters or 0.  The element 0
indicate the place to embed a consonant.

Optional WITH-MAA-SAKOD-RULE is a rule to re-order and modify VOWEL
follwoing a consonant and preceding a maa-sakod character.  If it is
nil, NO-MAA-SAKOD-RULE is used.  The maa-sakod character is alwasy
appended at the tail.

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
string following a consonant `\e(1!\e(B' should be re-ordered as \"\e(1`!WM\e(B\".

Optional (MAA-SAKOD-n RULE-n) are rules specially applied to maa-sakod
character MAA-SAKOD-n.")

;;;###autoload
(defun lao-transcribe-single-roman-syllable-to-lao (from to &optional str)
  "Transcribe a Romanized Lao syllable in the region FROM and TO to Lao string.
Only the first syllable is transcribed.
The value has the form: (START END LAO-STRING), where
START and END are the beggining and end positions of the Roman Lao syllable,
LAO-STRING is the Lao character transcription of it.

Optional 3rd arg STR, if non-nil, is a string to search for Roman Lao
syllable.  In that case, FROM and TO are indexes to STR."
  (if str
      (if (setq from (string-match lao-transcription-pattern str from))
	  (progn
	    (if (>= from to)
		(setq from nil)
	      (setq to (match-end 0)))))
    (save-excursion
      (goto-char from)
      (if (setq to (re-search-forward lao-transcription-pattern to t))
	  (setq from (match-beginning 0))
	(setq from nil))))
  (if from
      (let* ((consonant (match-string 1 str))
	     (semivowel (match-string 3 str))
	     (vowel (match-string 5 str))
	     (maa-sakod (match-string 8 str))
	     (tone (match-string 9 str))
	     lao-consonant lao-semivowel lao-vowel lao-maa-sakod lao-tone
	     clen cidx)
	(setq to (match-end 0))
	(if (not consonant)
	    (setq str (cdr (assoc (match-string 0 str)
				  lao-transcription-punctuation-alist)))
	  (setq lao-consonant
		(cdr (assoc consonant lao-transcription-consonant-alist)))
	  (if (vectorp lao-consonant)
	      (setq lao-consonant (aref lao-consonant 0)))
	  (setq clen (length lao-consonant))
	  (if semivowel
	      ;; Include semivowel in STR.
	      (setq lao-semivowel
		    (cdr (assoc semivowel lao-transcription-semi-vowel-alist))
		    str (if (= clen 1)
			    (concat lao-consonant lao-semivowel)
			  (concat (substring lao-consonant 0 1) lao-semivowel
				  (substring lao-consonant 1))))
	    (setq str lao-consonant))
	  (if vowel
	      (let (rule)
		(setq lao-vowel
		      (cdr (assoc vowel lao-transcription-vowel-alist)))
		(if (vectorp lao-vowel)
		    (setq lao-vowel (aref lao-vowel 0)))
		(setq rule (assoc lao-vowel lao-vowel-reordering-rule))
		(if (null maa-sakod)
		    (setq rule (nth 1 rule))
		  (setq lao-maa-sakod
			(cdr (assoc maa-sakod lao-transcription-maa-sakod-alist))
			rule
			(or (cdr (assq (aref lao-maa-sakod 0) (nthcdr 2 rule)))
			    (nth 2 rule)
			    (nth 1 rule))))
		(or rule
		    (error "Lao vowel %S has no re-ordering rule" lao-vowel))
		(setq lao-consonant str str "")
		(while rule
		  (if (= (car rule) 0)
		      (setq str (concat str lao-consonant)
			    cidx (length str))
		    (setq str (concat str (list (car rule)))))
		  (setq rule (cdr rule)))
		(or cidx
		    (error "Lao vowel %S has malformed re-ordering rule" vowel))
		;; Set CIDX to after upper or lower vowel if any.
		(let ((len (length str)))
		  (while (and (< cidx len)
			      (memq (get-char-code-property (aref str cidx)
							    'phonetic-type)
				    '(vowel-lower vowel-upper)))
		    (setq cidx (1+ cidx))))
		(if lao-maa-sakod
		    (setq str (concat str lao-maa-sakod)))
		(if tone
		    (setq lao-tone
			  (cdr (assoc tone lao-transcription-tone-alist))
			  str (concat (substring str 0 cidx) lao-tone
				      (substring str cidx)))))))
	(list from to (lao-compose-string str)))))

;;;###autoload
(defun lao-transcribe-roman-to-lao-string (str)
  "Transcribe Romanized Lao string STR to Lao character string."
  (let ((from 0)
	(to (length str))
	(lao-str "")
	val)
    (while (setq val (lao-transcribe-single-roman-syllable-to-lao from to str))
      (let ((start (car val))
	    (end (nth 1 val))
	    (lao (nth 2 val)))
	(if (> start from)
	    (setq lao-str (concat lao-str (substring str from start) lao))
	  (setq lao-str (concat lao-str lao)))
	(setq from end)))
    (if (< from to)
	(concat lao-str (substring str from to))
      lao-str)))

;;;###autoload
(defun lao-composition-function (pos &optional string)
  (setq pos (1- pos))
  (with-category-table lao-category-table
    (if string
	(if (and (>= pos 0)
		 (eq (string-match lao-composition-pattern string pos) pos))
	    (prog1 (match-end 0)
	      (compose-string string pos (match-end 0))))
      (if (>= pos (point-min))
	  (save-excursion
	    (goto-char pos)
	    (if (looking-at lao-composition-pattern)
		(prog1 (match-end 0)
		  (compose-region pos (match-end 0)))))))))

;;;###autoload
(defun lao-compose-region (from to)
  (interactive "r")
  (save-restriction
    (narrow-to-region from to)
    (goto-char (point-min))
    (with-category-table lao-category-table
      (while (re-search-forward lao-composition-pattern nil t)
	(compose-region (match-beginning 0) (point))))))

;;
(provide 'lao-util)

;;; arch-tag: 1f828781-3cb8-4695-88af-8f33222338ce
;;; lao-util.el ends here
Commit	Line	Data
64fd2bb1	1	;;; lao-util.el --- utilities for Lao -- coding: iso-2022-7bit; --
d92d0128	2
38141d20	3	;; Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
d4877ac1	4	;; Free Software Foundation, Inc.
38141d20 GM	5	;; Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
38141d20 GM	6	;; 2007, 2008
eaa61218 KH	7	;; National Institute of Advanced Industrial Science and Technology (AIST)
eaa61218 KH	8	;; Registration Number H14PRO021
8f924df7 KH	9	;; Copyright (C) 2003
	10	;; National Institute of Advanced Industrial Science and Technology (AIST)
	11	;; Registration Number H13PRO009
d92d0128	12
ffdc0bca	13	;; Keywords: multilingual, Lao, i18n
d92d0128 KH	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
d7142f3e	19	;; the Free Software Foundation; either version 3, or (at your option)
d92d0128 KH	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
3a35cf56 LK	29	;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
3a35cf56 LK	30	;; Boston, MA 02110-1301, USA.
d92d0128	31
60370d40 PJ	32	;;; Commentary:
60370d40 PJ	33
d92d0128 KH	34	;;; Code:
d92d0128 KH	35
31ce7719 KH	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
d92d0128 KH	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")
3518ac16 KH	65	(?\e(16\e(B consonant "LETTER THOR THUNG" "TO ASK,QUESTION")
3518ac16 KH	66	(?\e(17\e(B consonant "LETTER DHOR DHARM" "FLAG")
d92d0128 KH	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")
a1506d29	95	(?\e(1T\e(B vowel-upper "VOWEL SIGN SARA I")
d92d0128 KH	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)
a1506d29	113	(?\e(1f\e(B special "KO LA (REPETITION)")
d92d0128 KH	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")
ffdc0bca	137	(?\e(1~\e(B invalid nil)))
d92d0128 KH	138	elm)
d92d0128 KH	139	(while l
31ce7719 KH	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
908ac9e2 KH	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
31ce7719 KH	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))
ffdc0bca	365	("\e(1S\e(B" (0 ?\e(1S\e(B)))
31ce7719 KH	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
a549727e	495	;;;###autoload
908ac9e2 KH	496	(defun lao-composition-function (pos &optional string)
	497	(setq pos (1- pos))
	498	(with-category-table lao-category-table
	499	(if string
	500	(if (and (>= pos 0)
	501	(eq (string-match lao-composition-pattern string pos) pos))
	502	(prog1 (match-end 0)
	503	(compose-string string pos (match-end 0))))
	504	(if (>= pos (point-min))
	505	(save-excursion
	506	(goto-char pos)
	507	(if (looking-at lao-composition-pattern)
	508	(prog1 (match-end 0)
	509	(compose-region pos (match-end 0)))))))))
d92d0128	510
9b21ecc2 KH	511	;;;###autoload
	512	(defun lao-compose-region (from to)
	513	(interactive "r")
	514	(save-restriction
	515	(narrow-to-region from to)
	516	(goto-char (point-min))
	517	(with-category-table lao-category-table
	518	(while (re-search-forward lao-composition-pattern nil t)
	519	(compose-region (match-beginning 0) (point))))))
	520
d92d0128	521	;;
650e8505	522	(provide 'lao-util)
d92d0128	523
6b61353c	524	;;; arch-tag: 1f828781-3cb8-4695-88af-8f33222338ce
d92d0128	525	;;; lao-util.el ends here