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288 lines
12 KiB
EmacsLisp
288 lines
12 KiB
EmacsLisp
;;; thai-util.el --- utilities for Thai -*- coding: iso-2022-7bit; -*-
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;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
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;; 2005, 2006, 2007, 2008
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;; National Institute of Advanced Industrial Science and Technology (AIST)
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;; Registration Number H14PRO021
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;; Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
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;; Free Software Foundation, Inc.
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;; Keywords: mule, multilingual, Thai, i18n
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 3, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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;; Boston, MA 02110-1301, USA.
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;;; Commentary:
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;;; Code:
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(defvar thai-auto-composition-mode)
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;; Setting information of Thai characters.
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(defconst thai-category-table (make-category-table))
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(define-category ?c "Thai consonant" thai-category-table)
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(define-category ?v "Thai upper/lower vowel" thai-category-table)
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(define-category ?t "Thai tone mark" thai-category-table)
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(define-category ?u "Thai tone mark and upper sign" thai-category-table)
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(define-category ?I "THAI CHARACTER SARA I" thai-category-table)
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(define-category ?U "THAI CHARACTER THANTHAKHAT" thai-category-table)
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;; The general composing rules are as follows:
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;;
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;; T
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;; V U V U
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;; CV -> C, CU -> C, CVT -> C, Cv -> C, CvU -> C
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;; v v
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;;
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;; where C: consonant, V: vowel upper, v: vowel lower,
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;; T: tone mark, U: tone mark and upper sign.
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;; Special rule: The sign `,Tl(B' can be put on the vowel `,TT(B'.
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(defvar thai-composition-pattern
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"\\cc\\(\\cu\\|\\cI\\cU\\|\\cv\\ct?\\)\\|\\cv\\ct\\|\\cI\\cU"
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"Regular expression matching a Thai composite sequence.")
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(let ((l '((?,T!(B consonant "LETTER KO KAI") ; 0xA1
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(?,T"(B consonant "LETTER KHO KHAI") ; 0xA2
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(?,T#(B consonant "LETTER KHO KHUAT") ; 0xA3
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(?,T$(B consonant "LETTER KHO KHWAI") ; 0xA4
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(?,T%(B consonant "LETTER KHO KHON") ; 0xA5
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(?,T&(B consonant "LETTER KHO RAKHANG") ; 0xA6
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(?,T'(B consonant "LETTER NGO NGU") ; 0xA7
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(?,T((B consonant "LETTER CHO CHAN") ; 0xA8
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(?,T)(B consonant "LETTER CHO CHING") ; 0xA9
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(?,T*(B consonant "LETTER CHO CHANG") ; 0xAA
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(?,T+(B consonant "LETTER SO SO") ; 0xAB
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(?,T,(B consonant "LETTER CHO CHOE") ; 0xAC
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(?,T-(B consonant "LETTER YO YING") ; 0xAD
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(?,T.(B consonant "LETTER DO CHADA") ; 0xAE
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(?,T/(B consonant "LETTER TO PATAK") ; 0xAF
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(?,T0(B consonant "LETTER THO THAN") ; 0xB0
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(?,T1(B consonant "LETTER THO NANGMONTHO") ; 0xB1
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(?,T2(B consonant "LETTER THO PHUTHAO") ; 0xB2
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(?,T3(B consonant "LETTER NO NEN") ; 0xB3
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(?,T4(B consonant "LETTER DO DEK") ; 0xB4
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(?,T5(B consonant "LETTER TO TAO") ; 0xB5
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(?,T6(B consonant "LETTER THO THUNG") ; 0xB6
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(?,T7(B consonant "LETTER THO THAHAN") ; 0xB7
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(?,T8(B consonant "LETTER THO THONG") ; 0xB8
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(?,T9(B consonant "LETTER NO NU") ; 0xB9
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(?,T:(B consonant "LETTER BO BAIMAI") ; 0xBA
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(?,T;(B consonant "LETTER PO PLA") ; 0xBB
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(?,T<(B consonant "LETTER PHO PHUNG") ; 0xBC
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(?,T=(B consonant "LETTER FO FA") ; 0xBD
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(?,T>(B consonant "LETTER PHO PHAN") ; 0xBE
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(?,T?(B consonant "LETTER FO FAN") ; 0xBF
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(?,T@(B consonant "LETTER PHO SAMPHAO") ; 0xC0
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(?,TA(B consonant "LETTER MO MA") ; 0xC1
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(?,TB(B consonant "LETTER YO YAK") ; 0xC2
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(?,TC(B consonant "LETTER RO RUA") ; 0xC3
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(?,TD(B vowel-base "LETTER RU (Pali vowel letter)") ; 0xC4
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(?,TE(B consonant "LETTER LO LING") ; 0xC5
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(?,TF(B vowel-base "LETTER LU (Pali vowel letter)") ; 0xC6
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(?,TG(B consonant "LETTER WO WAEN") ; 0xC7
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(?,TH(B consonant "LETTER SO SALA") ; 0xC8
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(?,TI(B consonant "LETTER SO RUSI") ; 0xC9
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(?,TJ(B consonant "LETTER SO SUA") ; 0xCA
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(?,TK(B consonant "LETTER HO HIP") ; 0xCB
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(?,TL(B consonant "LETTER LO CHULA") ; 0xCC
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(?,TM(B consonant "LETTER O ANG") ; 0xCD
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(?,TN(B consonant "LETTER HO NOK HUK") ; 0xCE
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(?,TO(B special "PAI YAN NOI (abbreviation)") ; 0xCF
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(?,TP(B vowel-base "VOWEL SIGN SARA A") ; 0xD0
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(?,TQ(B vowel-upper "VOWEL SIGN MAI HAN-AKAT N/S-T") ; 0xD1
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(?,TR(B vowel-base "VOWEL SIGN SARA AA") ; 0xD2
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(?,TS(B vowel-base "VOWEL SIGN SARA AM") ; 0xD3
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(?,TT(B vowel-upper "VOWEL SIGN SARA I N/S-T") ; 0xD4
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(?,TU(B vowel-upper "VOWEL SIGN SARA II N/S-T") ; 0xD5
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(?,TV(B vowel-upper "VOWEL SIGN SARA UE N/S-T") ; 0xD6
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(?,TW(B vowel-upper "VOWEL SIGN SARA UEE N/S-T") ; 0xD7
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(?,TX(B vowel-lower "VOWEL SIGN SARA U N/S-B") ; 0xD8
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(?,TY(B vowel-lower "VOWEL SIGN SARA UU N/S-B") ; 0xD9
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(?,TZ(B vowel-lower "VOWEL SIGN PHINTHU N/S-B (Pali virama)") ; 0xDA
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(?,T[(B invalid nil) ; 0xDA
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(?,T\(B invalid nil) ; 0xDC
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(?,T](B invalid nil) ; 0xDC
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(?,T^(B invalid nil) ; 0xDC
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(?,T_(B special "BAHT SIGN (currency symbol)") ; 0xDF
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(?,T`(B vowel-base "VOWEL SIGN SARA E") ; 0xE0
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(?,Ta(B vowel-base "VOWEL SIGN SARA AE") ; 0xE1
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(?,Tb(B vowel-base "VOWEL SIGN SARA O") ; 0xE2
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(?,Tc(B vowel-base "VOWEL SIGN SARA MAI MUAN") ; 0xE3
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(?,Td(B vowel-base "VOWEL SIGN SARA MAI MALAI") ; 0xE4
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(?,Te(B vowel-base "LAK KHANG YAO") ; 0xE5
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(?,Tf(B special "MAI YAMOK (repetion)") ; 0xE6
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(?,Tg(B sign-upper "VOWEL SIGN MAI TAI KHU N/S-T") ; 0xE7
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(?,Th(B tone "TONE MAI EK N/S-T") ; 0xE8
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(?,Ti(B tone "TONE MAI THO N/S-T") ; 0xE9
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(?,Tj(B tone "TONE MAI TRI N/S-T") ; 0xEA
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(?,Tk(B tone "TONE MAI CHATTAWA N/S-T") ; 0xEB
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(?,Tl(B sign-upper "THANTHAKHAT N/S-T (cancellation mark)") ; 0xEC
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(?,Tm(B sign-upper "NIKKHAHIT N/S-T (final nasal)") ; 0xED
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(?,Tn(B sign-upper "YAMAKKAN N/S-T") ; 0xEE
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(?,To(B special "FONRMAN") ; 0xEF
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(?,Tp(B special "DIGIT ZERO") ; 0xF0
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(?,Tq(B special "DIGIT ONE") ; 0xF1
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(?,Tr(B special "DIGIT TWO") ; 0xF2
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(?,Ts(B special "DIGIT THREE") ; 0xF3
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(?,Tt(B special "DIGIT FOUR") ; 0xF4
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(?,Tu(B special "DIGIT FIVE") ; 0xF5
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(?,Tv(B special "DIGIT SIX") ; 0xF6
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(?,Tw(B special "DIGIT SEVEN") ; 0xF7
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(?,Tx(B special "DIGIT EIGHT") ; 0xF8
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(?,Ty(B special "DIGIT NINE") ; 0xF9
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(?,Tz(B special "ANGKHANKHU (ellipsis)") ; 0xFA
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(?,T{(B special "KHOMUT (beginning of religious texts)") ; 0xFB
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(?,T|(B invalid nil) ; 0xFC
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(?,T}(B invalid nil) ; 0xFD
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(?,T~(B invalid nil) ; 0xFE
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))
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elm)
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(while l
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(setq elm (car l) l (cdr l))
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(let ((char (car elm))
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(ptype (nth 1 elm)))
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(put-char-code-property char 'phonetic-type ptype)
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(cond ((eq ptype 'consonant)
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(modify-category-entry char ?c thai-category-table))
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((memq ptype '(vowel-upper vowel-lower))
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(modify-category-entry char ?v thai-category-table)
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(if (= char ?,TT(B)
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;; Give category `I' to "SARA I".
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(modify-category-entry char ?I thai-category-table)))
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((eq ptype 'tone)
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(modify-category-entry char ?t thai-category-table)
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(modify-category-entry char ?u thai-category-table))
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((eq ptype 'sign-upper)
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(modify-category-entry char ?u thai-category-table)
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(if (= char ?,Tl(B)
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;; Give category `U' to "THANTHAKHAT".
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(modify-category-entry char ?U thai-category-table))))
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(put-char-code-property char 'name (nth 2 elm)))))
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(defun thai-compose-syllable (beg end &optional category-set string)
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(or category-set
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(setq category-set
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(char-category-set (if string (aref string beg) (char-after beg)))))
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(if (aref category-set ?c)
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;; Starting with a consonant. We do relative composition.
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(if string
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(compose-string string beg end)
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(compose-region beg end))
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;; Vowel tone sequence.
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(if string
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(compose-string string beg end (list (aref string beg) '(Bc . Bc)
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(aref string (1+ beg))))
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(compose-region beg end (list (char-after beg) '(Bc . Bc)
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(char-after (1+ beg))))))
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(- end beg))
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;;;###autoload
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(defun thai-compose-region (beg end)
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"Compose Thai characters in the region.
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When called from a program, expects two arguments,
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positions (integers or markers) specifying the region."
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(interactive "r")
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(let ((pos (point)))
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(save-restriction
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(narrow-to-region beg end)
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(goto-char (point-min))
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(with-category-table thai-category-table
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(while (re-search-forward thai-composition-pattern nil t)
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(setq beg (match-beginning 0) end (match-end 0))
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(if (and (> pos beg) (< pos end))
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(setq pos end))
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(thai-compose-syllable beg end
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(char-category-set (char-after beg))))))
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(goto-char pos)))
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;;;###autoload
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(defun thai-compose-string (string)
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"Compose Thai characters in STRING and return the resulting string."
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(with-category-table thai-category-table
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(let ((idx 0))
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(while (setq idx (string-match thai-composition-pattern string idx))
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(thai-compose-syllable idx (match-end 0) nil string)
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(setq idx (match-end 0)))))
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string)
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;;;###autoload
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(defun thai-compose-buffer ()
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"Compose Thai characters in the current buffer."
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(interactive)
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(thai-compose-region (point-min) (point-max)))
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;;;###autoload
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(defun thai-composition-function (pos to font-object string)
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(setq pos (1- pos))
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(with-category-table thai-category-table
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(if string
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(if (and (>= pos 0)
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(eq (string-match thai-composition-pattern string pos) pos))
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(prog1 (match-end 0)
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(thai-compose-syllable pos (match-end 0) nil string)))
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(if (>= pos (point-min))
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(progn
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(goto-char pos)
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(if (looking-at thai-composition-pattern)
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(prog1 (match-end 0)
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(thai-compose-syllable pos (match-end 0)))))))))
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;; Thai-word-mode requires functions in the feature `thai-word'.
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(require 'thai-word)
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(defvar thai-word-mode-map
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(let ((map (make-sparse-keymap)))
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(define-key map [remap forward-word] 'thai-forward-word)
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(define-key map [remap backward-word] 'thai-backward-word)
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(define-key map [remap kill-word] 'thai-kill-word)
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(define-key map [remap backward-kill-word] 'thai-backward-kill-word)
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(define-key map [remap transpose-words] 'thai-transpose-words)
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map)
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"Keymap for `thai-word-mode'.")
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(define-minor-mode thai-word-mode
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"Minor mode to make word-oriented commands aware of Thai words.
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The commands affected are \\[forward-word], \\[backward-word], \\[kill-word], \\[backward-kill-word], \\[transpose-words], and \\[fill-paragraph]."
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:global t :group 'mule
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(cond (thai-word-mode
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;; This enables linebreak between Thai characters.
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(modify-category-entry (make-char 'thai-tis620) ?|)
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;; This enables linebreak at a Thai word boundary.
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(put-charset-property 'thai-tis620 'fill-find-break-point-function
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'thai-fill-find-break-point))
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(t
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(modify-category-entry (make-char 'thai-tis620) ?| nil t)
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(put-charset-property 'thai-tis620 'fill-find-break-point-function
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nil))))
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;; Function to call on entering the Thai language environment.
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(defun setup-thai-language-environment-internal ()
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(thai-word-mode 1))
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;; Function to call on exiting the Thai language environment.
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(defun exit-thai-language-environment-internal ()
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(thai-word-mode -1))
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;;
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(provide 'thai-util)
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;;; arch-tag: 59425d6a-8cf9-4e06-a6ab-8ab7dc7a7a97
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;;; thai-util.el ends here
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