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

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

;; Copyright (C) 2001-2011
;;   Free Software Foundation, Inc.
;; Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
;;   2007, 2008, 2009, 2010, 2011
;;   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 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.

;;; 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 (gstring)
  (if (= (lgstring-char-len gstring) 1)
      (compose-gstring-for-graphic gstring)
    (or (font-shape-gstring gstring)
	(let ((glyph-len (lgstring-glyph-len gstring))
	      (i 0)
	      glyph)
	  (while (and (< i glyph-len)
		      (setq glyph (lgstring-glyph gstring i)))
	    (setq i (1+ i)))
	  (compose-glyph-string-relative gstring 0 i 0.1)))))

;;;###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)

;;; lao-util.el ends here
Commit	Line	Data
64fd2bb1	1	;;; lao-util.el --- utilities for Lao -- coding: iso-2022-7bit; --
d92d0128	2
73b0cd50	3	;; Copyright (C) 2001-2011
d4877ac1	4	;; Free Software Foundation, Inc.
38141d20	5	;; Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
5df4f04c	6	;; 2007, 2008, 2009, 2010, 2011
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
4936186e	17	;; GNU Emacs is free software: you can redistribute it and/or modify
d92d0128	18	;; it under the terms of the GNU General Public License as published by
4936186e GM	19	;; the Free Software Foundation, either version 3 of the License, or
4936186e GM	20	;; (at your option) any later version.
d92d0128 KH	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
4936186e	28	;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
d92d0128	29
60370d40 PJ	30	;;; Commentary:
60370d40 PJ	31
d92d0128 KH	32	;;; Code:
d92d0128 KH	33
31ce7719 KH	34	;; Setting information of Thai characters.
	35
	36	(defconst lao-category-table (make-category-table))
	37	(define-category ?c "Lao consonant" lao-category-table)
	38	(define-category ?s "Lao semi-vowel" lao-category-table)
	39	(define-category ?v "Lao upper/lower vowel" lao-category-table)
	40	(define-category ?t "Lao tone" lao-category-table)
	41
d92d0128 KH	42	(let ((l '((?\e(1!\e(B consonant "LETTER KOR KAI'" "CHICKEN")
	43	(?\e(1"\e(B consonant "LETTER KHOR KHAI'" "EGG")
	44	(?\e(1#\e(B invalid nil)
	45	(?\e(1$\e(B consonant "LETTER QHOR QHWARGN" "BUFFALO")
	46	(?\e(1%\e(B invalid nil)
	47	(? invalid nil)
	48	(?\e(1'\e(B consonant "LETTER NGOR NGUU" "SNAKE")
	49	(?\e(1(\e(B consonant "LETTER JOR JUA" "BUDDHIST NOVICE")
	50	(?\e(1)\e(B invalid nil)
	51	(?\e(1*\e(B consonant "LETTER XOR X\"ARNG" "ELEPHANT")
	52	(?\e(1+\e(B invalid nil)
	53	(?\e(1,\e(B invalid nil)
	54	(?\e(1-\e(B consonant "LETTER YOR YUNG" "MOSQUITO")
	55	(?\e(1.\e(B invalid nil)
	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(14\e(B consonant "LETTER DOR DANG" "NOSE")
	62	(?\e(15\e(B consonant "LETTER TOR TAR" "EYE")
3518ac16 KH	63	(?\e(16\e(B consonant "LETTER THOR THUNG" "TO ASK,QUESTION")
3518ac16 KH	64	(?\e(17\e(B consonant "LETTER DHOR DHARM" "FLAG")
d92d0128 KH	65	(?\e(18\e(B invalid nil)
	66	(?\e(19\e(B consonant "LETTER NOR NOK" "BIRD")
	67	(?\e(1:\e(B consonant "LETTER BOR BED" "FISHHOOK")
	68	(?\e(1;\e(B consonant "LETTER POR PAR" "FISH")
	69	(?\e(1<\e(B consonant "LETTER HPOR HPER\"" "BEE")
	70	(?\e(1=\e(B consonant "LETTER FHOR FHAR" "WALL")
	71	(?\e(1>\e(B consonant "LETTER PHOR PHUU" "MOUNTAIN")
	72	(?\e(1?\e(B consonant "LETTER FOR FAI" "FIRE")
	73	(?\e(1@\e(B invalid nil)
	74	(?\e(1A\e(B consonant "LETTER MOR MAR\"" "HORSE")
	75	(?\e(1B\e(B consonant "LETTER GNOR GNAR" "MEDICINE")
	76	(?\e(1C\e(B consonant "LETTER ROR ROD" "CAR")
	77	(?\e(1D\e(B invalid nil)
	78	(?\e(1E\e(B consonant "LETTER LOR LIING" "MONKEY")
	79	(?\e(1F\e(B invalid nil)
	80	(?\e(1G\e(B consonant "LETTER WOR WII" "HAND FAN")
	81	(?\e(1H\e(B invalid nil)
	82	(?\e(1I\e(B invalid nil)
	83	(?\e(1J\e(B consonant "LETTER SOR SEA" "TIGER")
	84	(?\e(1K\e(B consonant "LETTER HHOR HHAI" "JAR")
	85	(?\e(1L\e(B invalid nil)
	86	(?\e(1M\e(B consonant "LETTER OR OOW" "TAKE")
	87	(?\e(1N\e(B consonant "LETTER HOR HEA" "BOAT")
	88	(?\e(1O\e(B special "ELLIPSIS")
	89	(?\e(1P\e(B vowel-base "VOWEL SIGN SARA A")
	90	(?\e(1Q\e(B vowel-upper "VOWEL SIGN MAI KAN")
	91	(?\e(1R\e(B vowel-base "VOWEL SIGN SARA AR")
	92	(?\e(1S\e(B vowel-base "VOWEL SIGN SARA AM")
a1506d29	93	(?\e(1T\e(B vowel-upper "VOWEL SIGN SARA I")
d92d0128 KH	94	(?\e(1U\e(B vowel-upper "VOWEL SIGN SARA II")
	95	(?\e(1V\e(B vowel-upper "VOWEL SIGN SARA EU")
	96	(?\e(1W\e(B vowel-upper "VOWEL SIGN SARA UR")
	97	(?\e(1X\e(B vowel-lower "VOWEL SIGN SARA U")
	98	(?\e(1Y\e(B vowel-lower "VOWEL SIGN SARA UU")
	99	(?\e(1Z\e(B invalid nil)
	100	(?\e(1[\e(B vowel-upper "VOWEL SIGN MAI KONG")
	101	(?\e(1\\e(B semivowel-lower "SEMIVOWEL SIGN LO")
	102	(?\e(1]\e(B vowel-base "SEMIVOWEL SIGN SARA IA")
	103	(?\e(1^\e(B invalid nil)
	104	(?\e(1_\e(B invalid nil)
	105	(?\e(1`\e(B vowel-base "VOWEL SIGN SARA EE")
	106	(?\e(1a\e(B vowel-base "VOWEL SIGN SARA AA")
	107	(?\e(1b\e(B vowel-base "VOWEL SIGN SARA OO")
	108	(?\e(1c\e(B vowel-base "VOWEL SIGN SARA EI MAI MUAN\"")
	109	(?\e(1d\e(B vowel-base "VOWEL SIGN SARA AI MAI MAY")
	110	(?\e(1e\e(B invalid nil)
a1506d29	111	(?\e(1f\e(B special "KO LA (REPETITION)")
d92d0128 KH	112	(?\e(1g\e(B invalid nil)
	113	(?\e(1h\e(B tone "TONE MAI EK")
	114	(?\e(1i\e(B tone "TONE MAI THO")
	115	(?\e(1j\e(B tone "TONE MAI TI")
	116	(?\e(1k\e(B tone "TONE MAI JADTAWAR")
	117	(?\e(1l\e(B tone "CANCELLATION MARK")
	118	(?\e(1m\e(B vowel-upper "VOWEL SIGN SARA OR")
	119	(?\e(1n\e(B invalid nil)
	120	(?\e(1o\e(B invalid nil)
	121	(?\e(1p\e(B special "DIGIT ZERO")
	122	(?\e(1q\e(B special "DIGIT ONE")
	123	(?\e(1r\e(B special "DIGIT TWO")
	124	(?\e(1s\e(B special "DIGIT THREE")
	125	(?\e(1t\e(B special "DIGIT FOUR")
	126	(?\e(1u\e(B special "DIGIT FIVE")
	127	(?\e(1v\e(B special "DIGIT SIX")
	128	(?\e(1w\e(B special "DIGIT SEVEN")
	129	(?\e(1x\e(B special "DIGIT EIGHT")
	130	(?\e(1y\e(B special "DIGIT NINE")
	131	(?\e(1z\e(B invalid nil)
	132	(?\e(1{\e(B invalid nil)
	133	(?\e(1\|\e(B consonant "LETTER NHOR NHUU" "MOUSE")
	134	(?\e(1}\e(B consonant "LETTER MHOR MHAR" "DOG")
ffdc0bca	135	(?\e(1~\e(B invalid nil)))
d92d0128 KH	136	elm)
d92d0128 KH	137	(while l
31ce7719 KH	138	(setq elm (car l) l (cdr l))
	139	(let ((char (car elm))
	140	(ptype (nth 1 elm)))
	141	(cond ((eq ptype 'consonant)
	142	(modify-category-entry char ?c lao-category-table))
	143	((memq ptype '(vowel-upper vowel-lower))
	144	(modify-category-entry char ?v lao-category-table))
	145	((eq ptype 'semivowel-lower)
	146	(modify-category-entry char ?s lao-category-table))
	147	((eq ptype 'tone)
	148	(modify-category-entry char ?t lao-category-table)))
	149	(put-char-code-property char 'phonetic-type ptype)
	150	(put-char-code-property char 'name (nth 2 elm))
	151	(put-char-code-property char 'meaning (nth 3 elm)))))
	152
	153	;; The general composing rules are as follows:
	154	;;
	155	;; T
	156	;; V T V T
	157	;; CV -> C, CT -> C, CVT -> C, Cv -> C, CvT -> C
	158	;; v v
	159	;; T
908ac9e2 KH	160	;; V T V T
	161	;; CsV -> C, CsT -> C, CsVT -> C, Csv -> C, CsvT -> C
	162	;; s s s s s
	163	;; v v
31ce7719 KH	164
	165
	166	;; where C: consonant, V: vowel upper, v: vowel lower,
	167	;; T: tone mark, s: semivowel lower
	168
	169	(defvar lao-composition-pattern
	170	"\\cc\\(\\ct\\\|\\cv\\ct?\\\|\\cs\\(\\ct\\\|\\cv\\ct?\\)?\\)"
	171	"Regular expression matching a Lao composite sequence.")
	172
	173	;;;###autoload
	174	(defun lao-compose-string (str)
	175	(with-category-table lao-category-table
	176	(let ((idx 0))
	177	(while (setq idx (string-match lao-composition-pattern str idx))
	178	(compose-string str idx (match-end 0))
	179	(setq idx (match-end 0))))
	180	str))
	181
	182	;;; LRT: Lao <-> Roman Transcription
	183
	184	;; Upper vowels and tone-marks are put on the letter.
	185	;; Semi-vowel-sign-lo and lower vowels are put under the letter.
	186
	187	(defconst lao-transcription-consonant-alist
	188	(sort '(;; single consonants
	189	("k" . "\e(1!\e(B")
	190	("kh" . "\e(1"\e(B")
	191	("qh" . "\e(1$\e(B")
	192	("ng" . "\e(1'\e(B")
	193	("j" . "\e(1(\e(B")
	194	("s" . "\e(1J\e(B")
	195	("x" . "\e(1*\e(B")
	196	("y" . "\e(1-\e(B")
	197	("d" . "\e(14\e(B")
	198	("t" . "\e(15\e(B")
	199	("th" . "\e(16\e(B")
	200	("dh" . "\e(17\e(B")
	201	("n" . "\e(19\e(B")
	202	("b" . "\e(1:\e(B")
	203	("p" . "\e(1;\e(B")
	204	("hp" . "\e(1<\e(B")
	205	("fh" . "\e(1=\e(B")
	206	("ph" . "\e(1>\e(B")
	207	("f" . "\e(1?\e(B")
	208	("m" . "\e(1A\e(B")
	209	("gn" . "\e(1B\e(B")
	210	("l" . "\e(1E\e(B")
	211	("r" . "\e(1C\e(B")
	212	("v" . "\e(1G\e(B")
	213	("w" . "\e(1G\e(B")
	214	("hh" . "\e(1K\e(B")
	215	("O" . "\e(1M\e(B")
	216	("h" . "\e(1N\e(B")
	217	("nh" . "\e(1\|\e(B")
	218	("mh" . "\e(1}\e(B")
	219	("lh" . ["\e(1K\\e(B"])
	220	;; double consonants
	221	("ngh" . ["\e(1K'\e(B"])
	222	("yh" . ["\e(1K]\e(B"])
	223	("wh" . ["\e(1KG\e(B"])
	224	("hl" . ["\e(1KE\e(B"])
	225	("hy" . ["\e(1K-\e(B"])
	226	("hn" . ["\e(1K9\e(B"])
	227	("hm" . ["\e(1KA\e(B"])
228	)
229	(function (lambda (x y) (> (length (car x)) (length (car y)))))))
230
231	(defconst lao-transcription-semi-vowel-alist
232	'(("r" . "\e(1\\e(B")))
233
234	(defconst lao-transcription-vowel-alist
235	(sort '(("a" . "\e(1P\e(B")
236	("ar" . "\e(1R\e(B")
237	("i" . "\e(1T\e(B")
238	("ii" . "\e(1U\e(B")
239	("eu" . "\e(1V\e(B")
240	("ur" . "\e(1W\e(B")
241	("u" . "\e(1X\e(B")
242	("uu" . "\e(1Y\e(B")
243	("e" . ["\e(1`P\e(B"])
244	("ee" . "\e(1`\e(B")
245	("ae" . ["\e(1aP\e(B"])
246	("aa" . "\e(1a\e(B")
247	("o" . ["\e(1bP\e(B"])
248	("oo" . "\e(1b\e(B")
249	("oe" . ["\e(1`RP\e(B"])
250	("or" . "\e(1m\e(B")
251	("er" . ["\e(1`T\e(B"])
252	("ir" . ["\e(1`U\e(B"])
253	("ua" . ["\e(1[GP\e(B"])
254	("uaa" . ["\e(1[G\e(B"])
255	("ie" . ["\e(1`Q]P\e(B"])
256	("ia" . ["\e(1`Q]\e(B"])
257	("ea" . ["\e(1`VM\e(B"])
258	("eaa" . ["\e(1`WM\e(B"])
259	("ai" . "\e(1d\e(B")
260	("ei" . "\e(1c\e(B")
261	("ao" . ["\e(1`[R\e(B"])
262	("aM" . "\e(1S\e(B"))
263	(function (lambda (x y) (> (length (car x)) (length (car y)))))))
264
265	;; Maa-sakod is put at the tail.
266	(defconst lao-transcription-maa-sakod-alist
267	'(("k" . "\e(1!\e(B")
268	("g" . "\e(1'\e(B")
269	("y" . "\e(1-\e(B")
270	("d" . "\e(14\e(B")
271	("n" . "\e(19\e(B")
272	("b" . "\e(1:\e(B")
273	("m" . "\e(1A\e(B")
274	("v" . "\e(1G\e(B")
275	("w" . "\e(1G\e(B")
276	))
277
278	(defconst lao-transcription-tone-alist
279	'(("'" . "\e(1h\e(B")
280	("\"" . "\e(1i\e(B")
281	("^" . "\e(1j\e(B")
282	("+" . "\e(1k\e(B")
283	("~" . "\e(1l\e(B")))
284
285	(defconst lao-transcription-punctuation-alist
286	'(("\\0" . "\e(1p\e(B")
287	("\\1" . "\e(1q\e(B")
288	("\\2" . "\e(1r\e(B")
289	("\\3" . "\e(1s\e(B")
290	("\\4" . "\e(1t\e(B")
291	("\\5" . "\e(1u\e(B")
292	("\\6" . "\e(1v\e(B")
293	("\\7" . "\e(1w\e(B")
294	("\\8" . "\e(1x\e(B")
295	("\\9" . "\e(1y\e(B")
296	("\\\\" . "\e(1f\e(B")
297	("\\$" . "\e(1O\e(B")))
298
299	(defconst lao-transcription-pattern
300	(concat
301	"\\("
302	(mapconcat 'car lao-transcription-consonant-alist "\\\|")
303	"\\)\\("
304	(mapconcat 'car lao-transcription-semi-vowel-alist "\\\|")
305	"\\)?\\(\\("
306	(mapconcat 'car lao-transcription-vowel-alist "\\\|")
307	"\\)\\("
308	(mapconcat 'car lao-transcription-maa-sakod-alist "\\\|")
309	"\\)?\\("
310	(mapconcat (lambda (x) (regexp-quote (car x)))
311	lao-transcription-tone-alist "\\\|")
312	"\\)?\\)?\\\|"
313	(mapconcat (lambda (x) (regexp-quote (car x)))
314	lao-transcription-punctuation-alist "\\\|")
315	)
316	"Regexp of Roman transcription pattern for one Lao syllable.")
317
318	(defconst lao-transcription-pattern
319	(concat
320	"\\("
321	(regexp-opt (mapcar 'car lao-transcription-consonant-alist))
322	"\\)\\("
323	(regexp-opt (mapcar 'car lao-transcription-semi-vowel-alist))
324	"\\)?\\(\\("
325	(regexp-opt (mapcar 'car lao-transcription-vowel-alist))
326	"\\)\\("
327	(regexp-opt (mapcar 'car lao-transcription-maa-sakod-alist))
328	"\\)?\\("
329	(regexp-opt (mapcar 'car lao-transcription-tone-alist))
330	"\\)?\\)?\\\|"
331	(regexp-opt (mapcar 'car lao-transcription-punctuation-alist))
332	)
333	"Regexp of Roman transcription pattern for one Lao syllable.")
334
335	(defconst lao-vowel-reordering-rule
336	'(("\e(1P\e(B" (0 ?\e(1P\e(B) (0 ?\e(1Q\e(B))
337	("\e(1R\e(B" (0 ?\e(1R\e(B))
338	("\e(1T\e(B" (0 ?\e(1U\e(B))
339	("\e(1U\e(B" (0 ?\e(1U\e(B))
340	("\e(1V\e(B" (0 ?\e(1V\e(B))
341	("\e(1W\e(B" (0 ?\e(1W\e(B))
342	("\e(1X\e(B" (0 ?\e(1X\e(B))
343	("\e(1Y\e(B" (0 ?\e(1Y\e(B))
344	("\e(1`P\e(B" (?\e(1`\e(B 0 ?\e(1P\e(B) (?\e(1`\e(B 0 ?\e(1Q\e(B))
345	("\e(1`\e(B" (?\e(1`\e(B 0))
346	("\e(1aP\e(B" (?\e(1a\e(B 0 ?\e(1P\e(B) (?\e(1a\e(B 0 ?\e(1Q\e(B))
347	("\e(1a\e(B" (?\e(1a\e(B 0))
348	("\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))
349	("\e(1b\e(B" (?\e(1b\e(B 0))
350	("\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))
351	("\e(1m\e(B" (0 ?\e(1m\e(B) (0 ?\e(1M\e(B))
352	("\e(1`T\e(B" (?\e(1`\e(B 0 ?\e(1T\e(B))
353	("\e(1`U\e(B" (?\e(1`\e(B 0 ?\e(1U\e(B))
354	("\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))
355	("\e(1[G\e(B" (0 ?\e(1[\e(B ?\e(1G\e(B) (0 ?\e(1G\e(B))
356	("\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))
357	("\e(1`Q]\e(B" (?\e(1`\e(B 0 ?\e(1Q\e(B ?\e(1]\e(B) (0 ?\e(1]\e(B))
358	("\e(1`VM\e(B" (?\e(1`\e(B 0 ?\e(1V\e(B ?\e(1M\e(B))
359	("\e(1`WM\e(B" (?\e(1`\e(B 0 ?\e(1W\e(B ?\e(1M\e(B))
360	("\e(1d\e(B" (?\e(1d\e(B 0))
361	("\e(1c\e(B" (?\e(1c\e(B 0))
362	("\e(1`[R\e(B" (?\e(1`\e(B 0 ?\e(1[\e(B ?\e(1R\e(B))
ffdc0bca	363	("\e(1S\e(B" (0 ?\e(1S\e(B)))
31ce7719 KH	364	"Alist of Lao vowel string vs the corresponding re-ordering rule.
	365	Each element has this form:
	366	(VOWEL NO-MAA-SAKOD-RULE WITH-MAA-SAKOD-RULE (MAA-SAKOD-0 RULE-0) ...)
	367
	368	VOWEL is a vowel string (e.g. \"\e(1`Q]P\e(B\").
	369
	370	NO-MAA-SAKOD-RULE is a rule to re-order and modify VOWEL following a
	371	consonant. It is a list vowel characters or 0. The element 0
	372	indicate the place to embed a consonant.
	373
	374	Optional WITH-MAA-SAKOD-RULE is a rule to re-order and modify VOWEL
	375	follwoing a consonant and preceding a maa-sakod character. If it is
	376	nil, NO-MAA-SAKOD-RULE is used. The maa-sakod character is alwasy
	377	appended at the tail.
	378
	379	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
	380	string following a consonant `\e(1!\e(B' should be re-ordered as \"\e(1`!WM\e(B\".
	381
	382	Optional (MAA-SAKOD-n RULE-n) are rules specially applied to maa-sakod
	383	character MAA-SAKOD-n.")
	384
	385	;;;###autoload
	386	(defun lao-transcribe-single-roman-syllable-to-lao (from to &optional str)
	387	"Transcribe a Romanized Lao syllable in the region FROM and TO to Lao string.
	388	Only the first syllable is transcribed.
	389	The value has the form: (START END LAO-STRING), where
	390	START and END are the beggining and end positions of the Roman Lao syllable,
	391	LAO-STRING is the Lao character transcription of it.
	392
	393	Optional 3rd arg STR, if non-nil, is a string to search for Roman Lao
	394	syllable. In that case, FROM and TO are indexes to STR."
	395	(if str
	396	(if (setq from (string-match lao-transcription-pattern str from))
	397	(progn
	398	(if (>= from to)
	399	(setq from nil)
	400	(setq to (match-end 0)))))
	401	(save-excursion
	402	(goto-char from)
	403	(if (setq to (re-search-forward lao-transcription-pattern to t))
	404	(setq from (match-beginning 0))
	405	(setq from nil))))
	406	(if from
	407	(let* ((consonant (match-string 1 str))
	408	(semivowel (match-string 3 str))
	409	(vowel (match-string 5 str))
	410	(maa-sakod (match-string 8 str))
	411	(tone (match-string 9 str))
	412	lao-consonant lao-semivowel lao-vowel lao-maa-sakod lao-tone
	413	clen cidx)
	414	(setq to (match-end 0))
	415	(if (not consonant)
	416	(setq str (cdr (assoc (match-string 0 str)
	417	lao-transcription-punctuation-alist)))
	418	(setq lao-consonant
	419	(cdr (assoc consonant lao-transcription-consonant-alist)))
	420	(if (vectorp lao-consonant)
	421	(setq lao-consonant (aref lao-consonant 0)))
	422	(setq clen (length lao-consonant))
	423	(if semivowel
	424	;; Include semivowel in STR.
	425	(setq lao-semivowel
	426	(cdr (assoc semivowel lao-transcription-semi-vowel-alist))
	427	str (if (= clen 1)
428	(concat lao-consonant lao-semivowel)
429	(concat (substring lao-consonant 0 1) lao-semivowel
430	(substring lao-consonant 1))))
431	(setq str lao-consonant))
432	(if vowel
433	(let (rule)
434	(setq lao-vowel
435	(cdr (assoc vowel lao-transcription-vowel-alist)))
436	(if (vectorp lao-vowel)
437	(setq lao-vowel (aref lao-vowel 0)))
438	(setq rule (assoc lao-vowel lao-vowel-reordering-rule))
439	(if (null maa-sakod)
440	(setq rule (nth 1 rule))
441	(setq lao-maa-sakod
442	(cdr (assoc maa-sakod lao-transcription-maa-sakod-alist))
443	rule
444	(or (cdr (assq (aref lao-maa-sakod 0) (nthcdr 2 rule)))
445	(nth 2 rule)
446	(nth 1 rule))))
447	(or rule
448	(error "Lao vowel %S has no re-ordering rule" lao-vowel))
449	(setq lao-consonant str str "")
450	(while rule
451	(if (= (car rule) 0)
452	(setq str (concat str lao-consonant)
453	cidx (length str))
454	(setq str (concat str (list (car rule)))))
455	(setq rule (cdr rule)))
456	(or cidx
457	(error "Lao vowel %S has malformed re-ordering rule" vowel))
458	;; Set CIDX to after upper or lower vowel if any.
459	(let ((len (length str)))
460	(while (and (< cidx len)
461	(memq (get-char-code-property (aref str cidx)
462	'phonetic-type)
463	'(vowel-lower vowel-upper)))
464	(setq cidx (1+ cidx))))
465	(if lao-maa-sakod
466	(setq str (concat str lao-maa-sakod)))
467	(if tone
468	(setq lao-tone
469	(cdr (assoc tone lao-transcription-tone-alist))
470	str (concat (substring str 0 cidx) lao-tone
471	(substring str cidx)))))))
472	(list from to (lao-compose-string str)))))
473
474	;;;###autoload
475	(defun lao-transcribe-roman-to-lao-string (str)
476	"Transcribe Romanized Lao string STR to Lao character string."
477	(let ((from 0)
478	(to (length str))
479	(lao-str "")
480	val)
481	(while (setq val (lao-transcribe-single-roman-syllable-to-lao from to str))
482	(let ((start (car val))
483	(end (nth 1 val))
484	(lao (nth 2 val)))
485	(if (> start from)
486	(setq lao-str (concat lao-str (substring str from start) lao))
487	(setq lao-str (concat lao-str lao)))
488	(setq from end)))
489	(if (< from to)
490	(concat lao-str (substring str from to))
491	lao-str)))
492
a549727e	493	;;;###autoload
70a6526c KH	494	(defun lao-composition-function (gstring)
70a6526c KH	495	(if (= (lgstring-char-len gstring) 1)
39a7775d	496	(compose-gstring-for-graphic gstring)
70a6526c	497	(or (font-shape-gstring gstring)
39a7775d KH	498	(let ((glyph-len (lgstring-glyph-len gstring))
	499	(i 0)
	500	glyph)
	501	(while (and (< i glyph-len)
	502	(setq glyph (lgstring-glyph gstring i)))
	503	(setq i (1+ i)))
70a6526c	504	(compose-glyph-string-relative gstring 0 i 0.1)))))
d92d0128	505
9b21ecc2 KH	506	;;;###autoload
	507	(defun lao-compose-region (from to)
	508	(interactive "r")
	509	(save-restriction
	510	(narrow-to-region from to)
	511	(goto-char (point-min))
	512	(with-category-table lao-category-table
	513	(while (re-search-forward lao-composition-pattern nil t)
	514	(compose-region (match-beginning 0) (point))))))
	515
d92d0128	516	;;
650e8505	517	(provide 'lao-util)
d92d0128 KH	518
d92d0128 KH	519	;;; lao-util.el ends here