;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
;; Licensed to the Free Software Foundation.
+;; Copyright (C) 2005
+;; National Institute of Advanced Industrial Science and Technology (AIST)
+;; Registration Number H14PRO021
;; Keywords: mule, multilingual, thai
(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)
+(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 T V T
-;; CV -> C, CT -> C, CVT -> C, Cv -> C, CvT -> C
+;; 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.
+;; where C: consonant, V: vowel upper, v: vowel lower,
+;; T: tone mark, U: tone mark and upper sign.
+;; Special rule: The sign `\e,Tl\e(B' can be put on the vowel `\e,TT\e(B'.
-(defvar thai-composition-pattern "\\cc\\(\\ct\\|\\cv\\ct?\\)"
+
+(defvar thai-composition-pattern
+ "\\cc\\(\\cu\\|\\cI\\cU\\|\\cv\\ct?\\)\\|\\cv\\ct\\|\\cI\\cU"
"Regular expression matching a Thai composite sequence.")
+(defun thai-self-insert-command (&optional n)
+ "Insert the Thai character you type.
+The character will be composed with the surrounding Thai character
+if necessary."
+ (interactive "*p")
+ (let ((pos (point))
+ category-set ch)
+ (self-insert-command n)
+ (or thai-auto-composition-mode
+ (thai-auto-composition (1- (point)) (point) 0))))
+
(let ((l '((?\e,T!\e(B consonant "LETTER KO KAI") ; 0xA1
(?\e,T"\e(B consonant "LETTER KHO KHAI") ; 0xA2
(?\e,T#\e(B consonant "LETTER KHO KHUAT") ; 0xA3
(?\e,Td\e(B vowel-base "VOWEL SIGN SARA MAI MALAI") ; 0xE4
(?\e,Te\e(B vowel-base "LAK KHANG YAO") ; 0xE5
(?\e,Tf\e(B special "MAI YAMOK (repetion)") ; 0xE6
- (?\e,Tg\e(B vowel-upper "VOWEL SIGN MAI TAI KHU N/S-T") ; 0xE7
+ (?\e,Tg\e(B sign-upper "VOWEL SIGN MAI TAI KHU N/S-T") ; 0xE7
(?\e,Th\e(B tone "TONE MAI EK N/S-T") ; 0xE8
(?\e,Ti\e(B tone "TONE MAI THO N/S-T") ; 0xE9
(?\e,Tj\e(B tone "TONE MAI TRI N/S-T") ; 0xEA
(?\e,Tk\e(B tone "TONE MAI CHATTAWA N/S-T") ; 0xEB
- (?\e,Tl\e(B tone "THANTHAKHAT N/S-T (cancellation mark)") ; 0xEC
- (?\e,Tm\e(B tone "NIKKHAHIT N/S-T (final nasal)") ; 0xED
- (?\e,Tn\e(B vowel-upper "YAMAKKAN N/S-T") ; 0xEE
+ (?\e,Tl\e(B sign-upper "THANTHAKHAT N/S-T (cancellation mark)") ; 0xEC
+ (?\e,Tm\e(B sign-upper "NIKKHAHIT N/S-T (final nasal)") ; 0xED
+ (?\e,Tn\e(B sign-upper "YAMAKKAN N/S-T") ; 0xEE
(?\e,To\e(B special "FONRMAN") ; 0xEF
(?\e,Tp\e(B special "DIGIT ZERO") ; 0xF0
(?\e,Tq\e(B special "DIGIT ONE") ; 0xF1
(?\e$,1CD\e(B vowel-base "VOWEL SIGN SARA MAI MALAI")
(?\e$,1CE\e(B vowel-base "LAK KHANG YAO")
(?\e$,1CF\e(B special "MAI YAMOK (repetion)")
- (?\e$,1CG\e(B vowel-upper "VOWEL SIGN MAI TAI KHU N/S-T")
+ (?\e$,1CG\e(B sign-upper "VOWEL SIGN MAI TAI KHU N/S-T")
(?\e$,1CH\e(B tone "TONE MAI EK N/S-T")
(?\e$,1CI\e(B tone "TONE MAI THO N/S-T")
(?\e$,1CJ\e(B tone "TONE MAI TRI N/S-T")
(?\e$,1CK\e(B tone "TONE MAI CHATTAWA N/S-T")
- (?\e$,1CL\e(B tone "THANTHAKHAT N/S-T (cancellation mark)")
- (?\e$,1CM\e(B tone "NIKKHAHIT N/S-T (final nasal)")
- (?\e$,1CN\e(B vowel-upper "YAMAKKAN N/S-T")
+ (?\e$,1CL\e(B sign-upper "THANTHAKHAT N/S-T (cancellation mark)")
+ (?\e$,1CM\e(B sign-upper "NIKKHAHIT N/S-T (final nasal)")
+ (?\e$,1CN\e(B sign-upper "YAMAKKAN N/S-T")
(?\e$,1CO\e(B special "FONRMAN")
(?\e$,1CP\e(B special "DIGIT ZERO")
(?\e$,1CQ\e(B special "DIGIT ONE")
(ptype (nth 1 elm)))
(put-char-code-property char 'phonetic-type ptype)
(cond ((eq ptype 'consonant)
- (modify-category-entry char ?c thai-category-table))
+ (modify-category-entry char ?c thai-category-table)
+ (global-set-key (vector char) 'thai-self-insert-command))
((memq ptype '(vowel-upper vowel-lower))
- (modify-category-entry char ?v thai-category-table))
+ (modify-category-entry char ?v thai-category-table)
+ (if (or (= char ?\e,TT\e(B) (= char ?\e$,1C4\e(B))
+ ;; Give category `I' to "SARA I".
+ (modify-category-entry char ?I thai-category-table))
+ (global-set-key (vector char) 'thai-self-insert-command))
((eq ptype 'tone)
- (modify-category-entry char ?t thai-category-table)))
+ (modify-category-entry char ?t thai-category-table)
+ (modify-category-entry char ?u thai-category-table)
+ (global-set-key (vector char) 'thai-self-insert-command))
+ ((eq ptype 'sign-upper)
+ (modify-category-entry char ?u thai-category-table)
+ (if (or (= char ?\e,Tl\e(B) (= char ?\e$,1CL\e(B))
+ ;; Give category `U' to "THANTHAKHAT".
+ (modify-category-entry char ?U thai-category-table))
+ (global-set-key (vector char) 'thai-self-insert-command)))
(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")
- (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))))))
+ (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)
(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))
+ (thai-compose-syllable idx (match-end 0) nil string)
(setq idx (match-end 0)))))
string)
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))))
+ (when (and (not thai-auto-composition-mode)
+ (< (1+ from) to))
+ (with-category-table thai-category-table
+ (if string
+ (if (eq (string-match thai-composition-pattern string from) from)
+ (thai-compose-syllable from (match-end 0) nil string))
+ (if (save-excursion
+ (goto-char from)
+ (and (looking-at thai-composition-pattern)
+ (setq to (match-end 0))))
+ (thai-compose-syllable from to))))))
+
+(defun thai-auto-composition (beg end len)
+ (with-category-table thai-category-table
+ (let (category-set)
+ (while (and (> beg (point-min))
+ (setq category-set (char-category-set (char-after (1- beg))))
+ (or (aref category-set ?v) (aref category-set ?u)))
+ (setq beg (1- beg)))
+ (if (and (> beg (point-min))
+ (aref (char-category-set (char-after (1- beg))) ?c))
+ (setq beg (1- beg)))
+ (while (and (< end (point-max))
+ (setq category-set (char-category-set (char-after end)))
+ (or (aref category-set ?v) (aref category-set ?u)))
+ (setq end (1+ end)))
+ (if (< beg end)
+ (thai-compose-region beg end)))))
+
+(put 'thai-auto-composition-mode 'permanent-local t)
+
+;;;###autoload
+(define-minor-mode thai-auto-composition-mode
+ "Minor mode for automatically correct Thai character composition."
+ nil nil nil
+ (cond ((null thai-auto-composition-mode)
+ (remove-hook 'after-change-functions 'thai-auto-composition))
+ (t
+ (add-hook 'after-change-functions 'thai-auto-composition))))
;;
(provide 'thai-util)
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