(thai-post-read-conversion): Delete this

function.
(thai-composition-function): Change arguments to conform to
composition-function-table.

lisp/language/thai-util.el

@@ -185,24 +185,20 @@ positions (integers or markers) specifying the region."
   (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)
-      (prog1 (- to from)
-	(if string
-	    (compose-string string from to)
-	  (compose-region from to))
-	(- to from))))
+(defun thai-composition-function (pos &optional string)
+  (setq pos (1- pos))
+  (let ((pattern "[,T!(B-,TCEG(B-,TN!(B-,TCEG(B-,TN(B][,TQT(B-,TWgnX(B-,TZQT(B-,TWgnX(B-,TZ(B]?[,Th(B-,Tmh(B-,Tm(B]?"))
+    (if string
+	(if (and (>= pos 0)
+		 (eq (string-match pattern string pos) pos))
+	    (prog1 (match-end 0)
+	      (compose-string string pos (match-end 0))))
+      (if (>= pos (point-min))
+	  (progn
+	    (goto-char pos)
+	    (if (looking-at pattern)
+		(prog1 (match-end 0)
+		  (compose-region pos (match-end 0)))))))))
 
 ;;
 (provide 'thai-util)