X-Git-Url: https://code.delx.au/gnu-emacs/blobdiff_plain/5e92d2b80109ccad114ed62591b9f6d518a0e800..1085b5512ac943c0f835e4b95eb8b149321f5924:/lisp/language/thai-util.el

diff --git a/lisp/language/thai-util.el b/lisp/language/thai-util.el
index 645bf03df0..e130c187c6 100644
--- a/lisp/language/thai-util.el
+++ b/lisp/language/thai-util.el
@@ -1,7 +1,8 @@
-;;; thai-util.el --- utilities for Thai
+;;; thai-util.el --- utilities for Thai -*- coding: iso-2022-7bit; -*-
 
-;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
-;; Licensed to the Free Software Foundation.
+;; Copyright (C) 1995, 1997, 1998, 1999, 2000, 2001, 2005
+;;   National Institute of Advanced Industrial Science and Technology (AIST)
+;;   Registration Number H14PRO021
 
 ;; Keywords: mule, multilingual, thai
 
@@ -22,16 +23,47 @@
 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 ;; Boston, MA 02111-1307, USA.
 
-;;; Code:
+;;; Commentary:
 
-;;;###autoload
-(defun setup-thai-environment ()
-  "Setup multilingual environment (MULE) for Thai."
-  (interactive)
-  (setup-8-bit-environment "Thai" 'thai-tis620 "thai-kesmanee"))
+;;; 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 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 `,Tl(B' can be put on the vowel `,TT(B'.
+
+
+(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 '((?,T!(B consonant "LETTER KO KAI")				; 0xA1
 	   (?,T"(B consonant "LETTER KHO KHAI")				; 0xA2
 	   (?,T#(B consonant "LETTER KHO KHUAT")				; 0xA3
@@ -102,14 +134,14 @@
 	   (?,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
+	   (?,Tg(B sign-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
+	   (?,Tl(B sign-upper "THANTHAKHAT N/S-T (cancellation mark)")	; 0xEC
+	   (?,Tm(B sign-upper "NIKKHAHIT N/S-T (final nasal)")		; 0xED
+	   (?,Tn(B sign-upper "YAMAKKAN N/S-T")				; 0xEE
 	   (?,To(B special "FONRMAN")					; 0xEF
 	   (?,Tp(B special "DIGIT ZERO")					; 0xF0
 	   (?,Tq(B special "DIGIT ONE")					; 0xF1
@@ -126,13 +158,139 @@
 	   (?,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 sign-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")
+	   (?$,1CL(B sign-upper "THANTHAKHAT N/S-T (cancellation mark)")
+	   (?$,1CM(B sign-upper "NIKKHAHIT N/S-T (final nasal)")
+	   (?$,1CN(B sign-upper "YAMAKKAN N/S-T")
+	   (?$,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))
-    (put-char-code-property (car elm) 'phonetic-type (car (cdr elm)))
-    (put-char-code-property (car elm) 'name (nth 2 elm))
-    (setq l (cdr 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)
+	     (global-set-key (vector char) 'thai-self-insert-command))
+	    ((memq ptype '(vowel-upper vowel-lower))
+	     (modify-category-entry char ?v thai-category-table)
+	     (if (or (= char ?,TT(B) (= char ?$,1C4(B))
+		 ;; Give category `I' to "SARA I".
+		 (modify-category-entry char ?I thai-category-table))
+	     (global-set-key (vector char) 'thai-self-insert-command))
+	    ((eq ptype 'tone)
+	     (modify-category-entry char ?t thai-category-table)
+	     (modify-category-entry char ?u thai-category-table)
+	     (global-set-key (vector char) 'thai-self-insert-command))
+	    ((eq ptype 'sign-upper)
+	     (modify-category-entry char ?u thai-category-table)
+	     (if (or (= char ?,Tl(B) (= char ?$,1CL(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)
@@ -140,13 +298,28 @@
 When called from a program, expects two arguments,
 positions (integers or markers) specifying the region."
   (interactive "r")
-  (save-restriction
-    (narrow-to-region beg end)
-    (decompose-region (point-min) (point-max))
-    (goto-char (point-min))
-    (while (re-search-forward "\\c0\\(\\c2\\|\\c3\\|\\c4\\)+" nil t)
-      (if (aref (char-category-set (char-after (match-beginning 0))) ?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)
+  "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 ()
@@ -156,28 +329,95 @@ positions (integers or markers) specifying the region."
 
 ;;;###autoload
 (defun thai-post-read-conversion (len)
-  (save-excursion
-    (save-restriction
-      (let ((buffer-modified-p (buffer-modified-p)))
-	(narrow-to-region (point) (+ (point) len))
-	(thai-compose-region (point-min) (point-max))
-	(set-buffer-modified-p buffer-modified-p)
-	(- (point-max) (point-min))))))
+  (thai-compose-region (point) (+ (point) len))
+  len)
 
 ;;;###autoload
-(defun thai-pre-write-conversion (from to)
-  (let ((old-buf (current-buffer))
-	(work-buf (get-buffer-create " *thai-work*")))
-    (set-buffer work-buf)
-    (erase-buffer)
-    (if (stringp from)
-	(insert from)
-      (insert-buffer-substring old-buf from to))
-    (decompose-region (point-min) (point-max))
-    ;; Should return nil as annotations.
-    nil))
+(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."
+  (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))))
+
+;; 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
+  (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)
 
+;;; arch-tag: 59425d6a-8cf9-4e06-a6ab-8ab7dc7a7a97
 ;;; thai-util.el ends here