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;;; thai-util.el --- utilities for Thai -*- coding: iso-2022-7bit; -*-
;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
;; Licensed to the Free Software Foundation.
;; Keywords: mule, multilingual, thai
;; 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 2, 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., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;;; Code:
;; Setting information of Thai characters.
(defconst thai-category-table (make-category-table))
(define-category ?c "Thai consonant" thai-category-table)
(define-category ?v "Thai upper/lower vowel" thai-category-table)
(define-category ?t "Thai tone" thai-category-table)
;; The general composing rules are as follows:
;;
;; T
;; V T V T
;; CV -> C, CT -> C, CVT -> C, Cv -> C, CvT -> C
;; v v
;;
;; where C: consonant, V: vowel upper, v: vowel lower, T: tone mark.
(defvar thai-composition-pattern "\\cc\\(\\ct\\|\\cv\\ct?\\)"
"Regular expression matching a Thai composite sequence.")
(let ((l '((?,T!(B consonant "LETTER KO KAI") ; 0xA1
(?,T"(B consonant "LETTER KHO KHAI") ; 0xA2
(?,T#(B consonant "LETTER KHO KHUAT") ; 0xA3
(?,T$(B consonant "LETTER KHO KHWAI") ; 0xA4
(?,T%(B consonant "LETTER KHO KHON") ; 0xA5
(?,T&(B consonant "LETTER KHO RAKHANG") ; 0xA6
(?,T'(B consonant "LETTER NGO NGU") ; 0xA7
(?,T((B consonant "LETTER CHO CHAN") ; 0xA8
(?,T)(B consonant "LETTER CHO CHING") ; 0xA9
(?,T*(B consonant "LETTER CHO CHANG") ; 0xAA
(?,T+(B consonant "LETTER SO SO") ; 0xAB
(?,T,(B consonant "LETTER CHO CHOE") ; 0xAC
(?,T-(B consonant "LETTER YO YING") ; 0xAD
(?,T.(B consonant "LETTER DO CHADA") ; 0xAE
(?,T/(B consonant "LETTER TO PATAK") ; 0xAF
(?,T0(B consonant "LETTER THO THAN") ; 0xB0
(?,T1(B consonant "LETTER THO NANGMONTHO") ; 0xB1
(?,T2(B consonant "LETTER THO PHUTHAO") ; 0xB2
(?,T3(B consonant "LETTER NO NEN") ; 0xB3
(?,T4(B consonant "LETTER DO DEK") ; 0xB4
(?,T5(B consonant "LETTER TO TAO") ; 0xB5
(?,T6(B consonant "LETTER THO THUNG") ; 0xB6
(?,T7(B consonant "LETTER THO THAHAN") ; 0xB7
(?,T8(B consonant "LETTER THO THONG") ; 0xB8
(?,T9(B consonant "LETTER NO NU") ; 0xB9
(?,T:(B consonant "LETTER BO BAIMAI") ; 0xBA
(?,T;(B consonant "LETTER PO PLA") ; 0xBB
(?,T<(B consonant "LETTER PHO PHUNG") ; 0xBC
(?,T=(B consonant "LETTER FO FA") ; 0xBD
(?,T>(B consonant "LETTER PHO PHAN") ; 0xBE
(?,T?(B consonant "LETTER FO FAN") ; 0xBF
(?,T@(B consonant "LETTER PHO SAMPHAO") ; 0xC0
(?,TA(B consonant "LETTER MO MA") ; 0xC1
(?,TB(B consonant "LETTER YO YAK") ; 0xC2
(?,TC(B consonant "LETTER RO RUA") ; 0xC3
(?,TD(B vowel-base "LETTER RU (Pali vowel letter)") ; 0xC4
(?,TE(B consonant "LETTER LO LING") ; 0xC5
(?,TF(B vowel-base "LETTER LU (Pali vowel letter)") ; 0xC6
(?,TG(B consonant "LETTER WO WAEN") ; 0xC7
(?,TH(B consonant "LETTER SO SALA") ; 0xC8
(?,TI(B consonant "LETTER SO RUSI") ; 0xC9
(?,TJ(B consonant "LETTER SO SUA") ; 0xCA
(?,TK(B consonant "LETTER HO HIP") ; 0xCB
(?,TL(B consonant "LETTER LO CHULA") ; 0xCC
(?,TM(B consonant "LETTER O ANG") ; 0xCD
(?,TN(B consonant "LETTER HO NOK HUK") ; 0xCE
(?,TO(B special "PAI YAN NOI (abbreviation)") ; 0xCF
(?,TP(B vowel-base "VOWEL SIGN SARA A") ; 0xD0
(?,TQ(B vowel-upper "VOWEL SIGN MAI HAN-AKAT N/S-T") ; 0xD1
(?,TR(B vowel-base "VOWEL SIGN SARA AA") ; 0xD2
(?,TS(B vowel-base "VOWEL SIGN SARA AM") ; 0xD3
(?,TT(B vowel-upper "VOWEL SIGN SARA I N/S-T") ; 0xD4
(?,TU(B vowel-upper "VOWEL SIGN SARA II N/S-T") ; 0xD5
(?,TV(B vowel-upper "VOWEL SIGN SARA UE N/S-T") ; 0xD6
(?,TW(B vowel-upper "VOWEL SIGN SARA UEE N/S-T") ; 0xD7
(?,TX(B vowel-lower "VOWEL SIGN SARA U N/S-B") ; 0xD8
(?,TY(B vowel-lower "VOWEL SIGN SARA UU N/S-B") ; 0xD9
(?,TZ(B vowel-lower "VOWEL SIGN PHINTHU N/S-B (Pali virama)") ; 0xDA
(?,T[(B invalid nil) ; 0xDA
(?,T\(B invalid nil) ; 0xDC
(?,T](B invalid nil) ; 0xDC
(?,T^(B invalid nil) ; 0xDC
(?,T_(B special "BAHT SIGN (currency symbol)") ; 0xDF
(?,T`(B vowel-base "VOWEL SIGN SARA E") ; 0xE0
(?,Ta(B vowel-base "VOWEL SIGN SARA AE") ; 0xE1
(?,Tb(B vowel-base "VOWEL SIGN SARA O") ; 0xE2
(?,Tc(B vowel-base "VOWEL SIGN SARA MAI MUAN") ; 0xE3
(?,Td(B vowel-base "VOWEL SIGN SARA MAI MALAI") ; 0xE4
(?,Te(B vowel-base "LAK KHANG YAO") ; 0xE5
(?,Tf(B special "MAI YAMOK (repetion)") ; 0xE6
(?,Tg(B vowel-upper "VOWEL SIGN MAI TAI KHU N/S-T") ; 0xE7
(?,Th(B tone "TONE MAI EK N/S-T") ; 0xE8
(?,Ti(B tone "TONE MAI THO N/S-T") ; 0xE9
(?,Tj(B tone "TONE MAI TRI N/S-T") ; 0xEA
(?,Tk(B tone "TONE MAI CHATTAWA N/S-T") ; 0xEB
(?,Tl(B tone "THANTHAKHAT N/S-T (cancellation mark)") ; 0xEC
(?,Tm(B tone "NIKKHAHIT N/S-T (final nasal)") ; 0xED
(?,Tn(B vowel-upper "YAMAKKAN N/S-T") ; 0xEE
(?,To(B special "FONRMAN") ; 0xEF
(?,Tp(B special "DIGIT ZERO") ; 0xF0
(?,Tq(B special "DIGIT ONE") ; 0xF1
(?,Tr(B special "DIGIT TWO") ; 0xF2
(?,Ts(B special "DIGIT THREE") ; 0xF3
(?,Tt(B special "DIGIT FOUR") ; 0xF4
(?,Tu(B special "DIGIT FIVE") ; 0xF5
(?,Tv(B special "DIGIT SIX") ; 0xF6
(?,Tw(B special "DIGIT SEVEN") ; 0xF7
(?,Tx(B special "DIGIT EIGHT") ; 0xF8
(?,Ty(B special "DIGIT NINE") ; 0xF9
(?,Tz(B special "ANGKHANKHU (ellipsis)") ; 0xFA
(?,T{(B special "KHOMUT (beginning of religious texts)") ; 0xFB
(?,T|(B invalid nil) ; 0xFC
(?,T}(B invalid nil) ; 0xFD
(?,T~(B invalid nil) ; 0xFE
;; Unicode equivalents
(?$,1Ba(B consonant "LETTER KO KAI")
(?$,1Bb(B consonant "LETTER KHO KHAI")
(?$,1Bc(B consonant "LETTER KHO KHUAT")
(?$,1Bd(B consonant "LETTER KHO KHWAI")
(?$,1Be(B consonant "LETTER KHO KHON")
(?$,1Bf(B consonant "LETTER KHO RAKHANG")
(?$,1Bg(B consonant "LETTER NGO NGU")
(?$,1Bh(B consonant "LETTER CHO CHAN")
(?$,1Bi(B consonant "LETTER CHO CHING")
(?$,1Bj(B consonant "LETTER CHO CHANG")
(?$,1Bk(B consonant "LETTER SO SO")
(?$,1Bl(B consonant "LETTER CHO CHOE")
(?$,1Bm(B consonant "LETTER YO YING")
(?$,1Bn(B consonant "LETTER DO CHADA")
(?$,1Bo(B consonant "LETTER TO PATAK")
(?$,1Bp(B consonant "LETTER THO THAN")
(?$,1Bq(B consonant "LETTER THO NANGMONTHO")
(?$,1Br(B consonant "LETTER THO PHUTHAO")
(?$,1Bs(B consonant "LETTER NO NEN")
(?$,1Bt(B consonant "LETTER DO DEK")
(?$,1Bu(B consonant "LETTER TO TAO")
(?$,1Bv(B consonant "LETTER THO THUNG")
(?$,1Bw(B consonant "LETTER THO THAHAN")
(?$,1Bx(B consonant "LETTER THO THONG")
(?$,1By(B consonant "LETTER NO NU")
(?$,1Bz(B consonant "LETTER BO BAIMAI")
(?$,1B{(B consonant "LETTER PO PLA")
(?$,1B|(B consonant "LETTER PHO PHUNG")
(?$,1B}(B consonant "LETTER FO FA")
(?$,1B~(B consonant "LETTER PHO PHAN")
(?$,1B(B consonant "LETTER FO FAN")
(?$,1C (B consonant "LETTER PHO SAMPHAO")
(?$,1C!(B consonant "LETTER MO MA")
(?$,1C"(B consonant "LETTER YO YAK")
(?$,1C#(B consonant "LETTER RO RUA")
(?$,1C$(B vowel-base "LETTER RU (Pali vowel letter)")
(?$,1C%(B consonant "LETTER LO LING")
(?$,1C&(B vowel-base "LETTER LU (Pali vowel letter)")
(?$,1C'(B consonant "LETTER WO WAEN")
(?$,1C((B consonant "LETTER SO SALA")
(?$,1C)(B consonant "LETTER SO RUSI")
(?$,1C*(B consonant "LETTER SO SUA")
(?$,1C+(B consonant "LETTER HO HIP")
(?$,1C,(B consonant "LETTER LO CHULA")
(?$,1C-(B consonant "LETTER O ANG")
(?$,1C.(B consonant "LETTER HO NOK HUK")
(?$,1C/(B special "PAI YAN NOI (abbreviation)")
(?$,1C0(B vowel-base "VOWEL SIGN SARA A")
(?$,1C1(B vowel-upper "VOWEL SIGN MAI HAN-AKAT N/S-T")
(?$,1C2(B vowel-base "VOWEL SIGN SARA AA")
(?$,1C3(B vowel-base "VOWEL SIGN SARA AM")
(?$,1C4(B vowel-upper "VOWEL SIGN SARA I N/S-T")
(?$,1C5(B vowel-upper "VOWEL SIGN SARA II N/S-T")
(?$,1C6(B vowel-upper "VOWEL SIGN SARA UE N/S-T")
(?$,1C7(B vowel-upper "VOWEL SIGN SARA UEE N/S-T")
(?$,1C8(B vowel-lower "VOWEL SIGN SARA U N/S-B")
(?$,1C9(B vowel-lower "VOWEL SIGN SARA UU N/S-B")
(?$,1C:(B vowel-lower "VOWEL SIGN PHINTHU N/S-B (Pali virama)")
(?$,1C?(B special "BAHT SIGN (currency symbol)")
(?$,1C@(B vowel-base "VOWEL SIGN SARA E")
(?$,1CA(B vowel-base "VOWEL SIGN SARA AE")
(?$,1CB(B vowel-base "VOWEL SIGN SARA O")
(?$,1CC(B vowel-base "VOWEL SIGN SARA MAI MUAN")
(?$,1CD(B vowel-base "VOWEL SIGN SARA MAI MALAI")
(?$,1CE(B vowel-base "LAK KHANG YAO")
(?$,1CF(B special "MAI YAMOK (repetion)")
(?$,1CG(B vowel-upper "VOWEL SIGN MAI TAI KHU N/S-T")
(?$,1CH(B tone "TONE MAI EK N/S-T")
(?$,1CI(B tone "TONE MAI THO N/S-T")
(?$,1CJ(B tone "TONE MAI TRI N/S-T")
(?$,1CK(B tone "TONE MAI CHATTAWA N/S-T")
(?$,1CL(B tone "THANTHAKHAT N/S-T (cancellation mark)")
(?$,1CM(B tone "NIKKHAHIT N/S-T (final nasal)")
(?$,1CN(B vowel-upper "YAMAKKAN N/S-T")
(?$,1CO(B special "FONRMAN")
(?$,1CP(B special "DIGIT ZERO")
(?$,1CQ(B special "DIGIT ONE")
(?$,1CR(B special "DIGIT TWO")
(?$,1CS(B special "DIGIT THREE")
(?$,1CT(B special "DIGIT FOUR")
(?$,1CU(B special "DIGIT FIVE")
(?$,1CV(B special "DIGIT SIX")
(?$,1CW(B special "DIGIT SEVEN")
(?$,1CX(B special "DIGIT EIGHT")
(?$,1CY(B special "DIGIT NINE")
(?$,1CZ(B special "ANGKHANKHU (ellipsis)")
(?$,1C[(B special "KHOMUT (beginning of religious texts)")
))
elm)
(while l
(setq elm (car l) l (cdr l))
(let ((char (car elm))
(ptype (nth 1 elm)))
(put-char-code-property char 'phonetic-type ptype)
(cond ((eq ptype 'consonant)
(modify-category-entry char ?c thai-category-table))
((memq ptype '(vowel-upper vowel-lower))
(modify-category-entry char ?v thai-category-table))
((eq ptype 'tone)
(modify-category-entry char ?t thai-category-table)))
(put-char-code-property char 'name (nth 2 elm)))))
;;;###autoload
(defun thai-compose-region (beg end)
"Compose Thai characters in the region.
When called from a program, expects two arguments,
positions (integers or markers) specifying the region."
(interactive "r")
(save-restriction
(narrow-to-region beg end)
(goto-char (point-min))
(with-category-table thai-category-table
(while (re-search-forward thai-composition-pattern nil t)
(compose-region (match-beginning 0) (match-end 0))))))
;;;###autoload
(defun thai-compose-string (string)
"Compose Thai characters in STRING and return the resulting string."
(with-category-table thai-category-table
(let ((idx 0))
(while (setq idx (string-match thai-composition-pattern string idx))
(compose-string string idx (match-end 0))
(setq idx (match-end 0)))))
string)
;;;###autoload
(defun thai-compose-buffer ()
"Compose Thai characters in the current buffer."
(interactive)
(thai-compose-region (point-min) (point-max)))
;;;###autoload
(defun thai-post-read-conversion (len)
(thai-compose-region (point) (+ (point) len))
len)
;;;###autoload
(defun thai-composition-function (from to pattern &optional string)
"Compose Thai text in the region FROM and TO.
The text matches the regular expression PATTERN.
Optional 4th argument STRING, if non-nil, is a string containing text
to compose.
The return value is number of composed characters."
(if (< (1+ from) to)
(progn
(if string
(compose-string string from to)
(compose-region from to))
(- to from))))
;;
(provide 'thai-util)
;;; thai-util.el ends here
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