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;;; thai-util.el --- utilities for Thai -*- coding: utf-8; -*-
;; Copyright (C) 1995, 1996, 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) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
;; Free Software Foundation, Inc.
;; Keywords: mule, multilingual, Thai, 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:
(defvar thai-auto-composition-mode)
;; 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 mark" thai-category-table)
(define-category ?u "Thai tone mark and upper sign" thai-category-table)
(define-category ?I "THAI CHARACTER SARA I" thai-category-table)
(define-category ?U "THAI CHARACTER THANTHAKHAT" thai-category-table)
;; The general composing rules are as follows:
;;
;; T
;; V U V U
;; CV -> C, CU -> C, CVT -> C, Cv -> C, CvU -> C
;; v v
;;
;; where C: consonant, V: vowel upper, v: vowel lower,
;; T: tone mark, U: tone mark and upper sign.
;; Special rule: The sign `์' can be put on the vowel `ิ'.
(defvar thai-composition-pattern
"\\cc\\(\\cu\\|\\cI\\cU\\|\\cv\\ct?\\)\\|\\cv\\ct\\|\\cI\\cU"
"Regular expression matching a Thai composite sequence.")
(let ((l '((?ก consonant "LETTER KO KAI") ; 0xA1
(?ข consonant "LETTER KHO KHAI") ; 0xA2
(?ฃ consonant "LETTER KHO KHUAT") ; 0xA3
(?ค consonant "LETTER KHO KHWAI") ; 0xA4
(?ฅ consonant "LETTER KHO KHON") ; 0xA5
(?ฆ consonant "LETTER KHO RAKHANG") ; 0xA6
(?ง consonant "LETTER NGO NGU") ; 0xA7
(?จ consonant "LETTER CHO CHAN") ; 0xA8
(?ฉ consonant "LETTER CHO CHING") ; 0xA9
(?ช consonant "LETTER CHO CHANG") ; 0xAA
(?ซ consonant "LETTER SO SO") ; 0xAB
(?ฌ consonant "LETTER CHO CHOE") ; 0xAC
(?ญ consonant "LETTER YO YING") ; 0xAD
(?ฎ consonant "LETTER DO CHADA") ; 0xAE
(?ฏ consonant "LETTER TO PATAK") ; 0xAF
(?ฐ consonant "LETTER THO THAN") ; 0xB0
(?ฑ consonant "LETTER THO NANGMONTHO") ; 0xB1
(?ฒ consonant "LETTER THO PHUTHAO") ; 0xB2
(?ณ consonant "LETTER NO NEN") ; 0xB3
(?ด consonant "LETTER DO DEK") ; 0xB4
(?ต consonant "LETTER TO TAO") ; 0xB5
(?ถ consonant "LETTER THO THUNG") ; 0xB6
(?ท consonant "LETTER THO THAHAN") ; 0xB7
(?ธ consonant "LETTER THO THONG") ; 0xB8
(?น consonant "LETTER NO NU") ; 0xB9
(?บ consonant "LETTER BO BAIMAI") ; 0xBA
(?ป consonant "LETTER PO PLA") ; 0xBB
(?ผ consonant "LETTER PHO PHUNG") ; 0xBC
(?ฝ consonant "LETTER FO FA") ; 0xBD
(?พ consonant "LETTER PHO PHAN") ; 0xBE
(?ฟ consonant "LETTER FO FAN") ; 0xBF
(?ภ consonant "LETTER PHO SAMPHAO") ; 0xC0
(?ม consonant "LETTER MO MA") ; 0xC1
(?ย consonant "LETTER YO YAK") ; 0xC2
(?ร consonant "LETTER RO RUA") ; 0xC3
(?ฤ vowel-base "LETTER RU (Pali vowel letter)") ; 0xC4
(?ล consonant "LETTER LO LING") ; 0xC5
(?ฦ vowel-base "LETTER LU (Pali vowel letter)") ; 0xC6
(?ว consonant "LETTER WO WAEN") ; 0xC7
(?ศ consonant "LETTER SO SALA") ; 0xC8
(?ษ consonant "LETTER SO RUSI") ; 0xC9
(?ส consonant "LETTER SO SUA") ; 0xCA
(?ห consonant "LETTER HO HIP") ; 0xCB
(?ฬ consonant "LETTER LO CHULA") ; 0xCC
(?อ consonant "LETTER O ANG") ; 0xCD
(?ฮ consonant "LETTER HO NOK HUK") ; 0xCE
(?ฯ special "PAI YAN NOI (abbreviation)") ; 0xCF
(?ะ vowel-base "VOWEL SIGN SARA A") ; 0xD0
(?ั vowel-upper "VOWEL SIGN MAI HAN-AKAT N/S-T") ; 0xD1
(?า vowel-base "VOWEL SIGN SARA AA") ; 0xD2
(?ำ vowel-base "VOWEL SIGN SARA AM") ; 0xD3
(?ิ vowel-upper "VOWEL SIGN SARA I N/S-T") ; 0xD4
(?ี vowel-upper "VOWEL SIGN SARA II N/S-T") ; 0xD5
(?ึ vowel-upper "VOWEL SIGN SARA UE N/S-T") ; 0xD6
(?ื vowel-upper "VOWEL SIGN SARA UEE N/S-T") ; 0xD7
(?ุ vowel-lower "VOWEL SIGN SARA U N/S-B") ; 0xD8
(?ู vowel-lower "VOWEL SIGN SARA UU N/S-B") ; 0xD9
(?ฺ vowel-lower "VOWEL SIGN PHINTHU N/S-B (Pali virama)") ; 0xDA
(? invalid nil) ; 0xDA
(? invalid nil) ; 0xDC
(? invalid nil) ; 0xDC
(? invalid nil) ; 0xDC
(?฿ special "BAHT SIGN (currency symbol)") ; 0xDF
(?เ vowel-base "VOWEL SIGN SARA E") ; 0xE0
(?แ vowel-base "VOWEL SIGN SARA AE") ; 0xE1
(?โ vowel-base "VOWEL SIGN SARA O") ; 0xE2
(?ใ vowel-base "VOWEL SIGN SARA MAI MUAN") ; 0xE3
(?ไ vowel-base "VOWEL SIGN SARA MAI MALAI") ; 0xE4
(?ๅ vowel-base "LAK KHANG YAO") ; 0xE5
(?ๆ special "MAI YAMOK (repetion)") ; 0xE6
(?็ sign-upper "VOWEL SIGN MAI TAI KHU N/S-T") ; 0xE7
(?่ tone "TONE MAI EK N/S-T") ; 0xE8
(?้ tone "TONE MAI THO N/S-T") ; 0xE9
(?๊ tone "TONE MAI TRI N/S-T") ; 0xEA
(?๋ tone "TONE MAI CHATTAWA N/S-T") ; 0xEB
(?์ sign-upper "THANTHAKHAT N/S-T (cancellation mark)") ; 0xEC
(?ํ sign-upper "NIKKHAHIT N/S-T (final nasal)") ; 0xED
(?๎ sign-upper "YAMAKKAN N/S-T") ; 0xEE
(?๏ special "FONRMAN") ; 0xEF
(?๐ special "DIGIT ZERO") ; 0xF0
(?๑ special "DIGIT ONE") ; 0xF1
(?๒ special "DIGIT TWO") ; 0xF2
(?๓ special "DIGIT THREE") ; 0xF3
(?๔ special "DIGIT FOUR") ; 0xF4
(?๕ special "DIGIT FIVE") ; 0xF5
(?๖ special "DIGIT SIX") ; 0xF6
(?๗ special "DIGIT SEVEN") ; 0xF7
(?๘ special "DIGIT EIGHT") ; 0xF8
(?๙ special "DIGIT NINE") ; 0xF9
(?๚ special "ANGKHANKHU (ellipsis)") ; 0xFA
(?๛ special "KHOMUT (beginning of religious texts)") ; 0xFB
(? invalid nil) ; 0xFC
(? invalid nil) ; 0xFD
(? invalid nil) ; 0xFE
))
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)
(if (= char ?ิ)
;; Give category `I' to "SARA I".
(modify-category-entry char ?I thai-category-table)))
((eq ptype 'tone)
(modify-category-entry char ?t thai-category-table)
(modify-category-entry char ?u thai-category-table))
((eq ptype 'sign-upper)
(modify-category-entry char ?u thai-category-table)
(if (= char ?์)
;; Give category `U' to "THANTHAKHAT".
(modify-category-entry char ?U thai-category-table))))
(put-char-code-property char 'name (nth 2 elm)))))
(defun thai-compose-syllable (beg end &optional category-set string)
(or category-set
(setq category-set
(char-category-set (if string (aref string beg) (char-after beg)))))
(if (aref category-set ?c)
;; Starting with a consonant. We do relative composition.
(if string
(compose-string string beg end)
(compose-region beg end))
;; Vowel tone sequence.
(if string
(compose-string string beg end (list (aref string beg) '(Bc . Bc)
(aref string (1+ beg))))
(compose-region beg end (list (char-after beg) '(Bc . Bc)
(char-after (1+ beg))))))
(- end beg))
;;;###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")
(let ((pos (point)))
(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)
(setq beg (match-beginning 0) end (match-end 0))
(if (and (> pos beg) (< pos end))
(setq pos end))
(thai-compose-syllable beg end
(char-category-set (char-after beg))))))
(goto-char pos)))
;;;###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))
(thai-compose-syllable idx (match-end 0) nil string)
(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-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))
(last-char (lgstring-char gstring
(1- (lgstring-char-len gstring))))
(i 0)
glyph)
(while (and (< i glyph-len)
(setq glyph (lgstring-glyph gstring i)))
(setq i (1+ i)))
(if (= last-char ?ำ)
(setq i (1- i)))
(compose-glyph-string-relative gstring 0 i 0.1)))))
;; Thai-word-mode requires functions in the feature `thai-word'.
(require 'thai-word)
(defvar thai-word-mode-map
(let ((map (make-sparse-keymap)))
(define-key map [remap forward-word] 'thai-forward-word)
(define-key map [remap backward-word] 'thai-backward-word)
(define-key map [remap kill-word] 'thai-kill-word)
(define-key map [remap backward-kill-word] 'thai-backward-kill-word)
(define-key map [remap transpose-words] 'thai-transpose-words)
map)
"Keymap for `thai-word-mode'.")
(define-minor-mode thai-word-mode
"Minor mode to make word-oriented commands aware of Thai words.
The commands affected are \\[forward-word], \\[backward-word], \\[kill-word], \\[backward-kill-word], \\[transpose-words], and \\[fill-paragraph]."
:global t :group 'mule
(cond (thai-word-mode
;; This enables linebreak between Thai characters.
(modify-category-entry (make-char 'thai-tis620) ?|)
;; This enables linebreak at a Thai word boundary.
(put-charset-property 'thai-tis620 'fill-find-break-point-function
'thai-fill-find-break-point))
(t
(modify-category-entry (make-char 'thai-tis620) ?| nil t)
(put-charset-property 'thai-tis620 'fill-find-break-point-function
nil))))
;; Function to call on entering the Thai language environment.
(defun setup-thai-language-environment-internal ()
(thai-word-mode 1))
;; Function to call on exiting the Thai language environment.
(defun exit-thai-language-environment-internal ()
(thai-word-mode -1))
;;
(provide 'thai-util)
;;; thai-util.el ends here
|
