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diff --git a/lisp/language/tai-viet.el b/lisp/language/tai-viet.el
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+;;; tai-viet.el --- support for Tai Viet -*- coding: utf-8; no-byte-compile: t -*-
+
+;; Copyright (C) 2007
+;;   National Institute of Advanced Industrial Science and Technology (AIST)
+;;   Registration Number H13PRO009
+;; Copyright (C) 2007  Free Software Foundation, Inc.
+
+;; Keywords: multilingual, Tai Viet, 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 2, 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; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+
+;; Tai Viet is being included in the Unicode at the range U+AA80..U+AADF.
+
+;;; Code:
+
+(set-char-table-range composition-function-table
+                      '(#xAA80 . #xAADF)
+                      'tai-viet-composition-function)
+
+(set-language-info-alist
+ "TaiViet" '((charset unicode)
+              (coding-system utf-8)
+              (coding-priority utf-8)
+              (input-method . "tai-sonla")
+              (sample-text
+               "TaiViet (ꪁꪫꪱꪣ ꪽꪕ)\t\tꪅꪰꪙ꫃ ꪨꪮ꫃ ꪁꪫꪱ / ꪅꪾ ꪨ� ꪁꪫꪱ")
+              (documentation . "\
+TaiViet refers to the Tai language used by Tai people in
+Vietnam, and also refers to the script used for this language.
+Both the script and language have the same origin as that of Thai
+language/script used in Thailand, but now they differ from each
+other in a significant way (especially the scripts are).
+
+The language name is spelled as \"ꪁꪫꪱꪣ ꪽꪕ\", and the script name is
+spelled as \"ꪎ� ꪽꪕ\" in the modern form, \"ꪎꪴ ꪽꪕ\" in the traditional
+from.
+
+As the proposal for TaiViet script to the Unicode is still on
+the progress, we use the Private Use Area for TaiViet
+characters (U+F000..U+F07E).  A TaiViet font encoded accordingly
+is available at this web page:
+    http://www.m17n.org/TaiViet/
+")))
+
+(provide 'tai-viet)
+
+;; Local Variables:
+;; coding: utf-8
+;; End:
diff --git a/lisp/language/tv-util.el b/lisp/language/tv-util.el
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+;;; tv-util.el --- support for Tai Viet                 -*- coding: utf-8 -*-
+
+;; Copyright (C) 2007
+;;   National Institute of Advanced Industrial Science and Technology (AIST)
+;;   Registration Number H13PRO009
+
+;; Keywords: multilingual, Tai Viet, 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 2, 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; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Code
+
+;; Regexp matching with a sequence of Tai Viet characters.
+(defconst tai-viet-re
+  (format "[\xaa80-\xaac2\xaadb-\xaadf]+"))
+
+;; Char-table of information about glyph type of Tai Viet characters.
+(defconst tai-viet-glyph-info
+  (let ((table (make-char-table nil))
+        (specials '((right-overhang . "ꪊꪋꪌꪍꪏꪓꪖꪜꪞꪡꪤꪨ")
+                    (left-overhang . "ꫂ")
+                    (combining-vowel . "ꪴꪰꪲꪳꪷꪸꪾ")
+                    (combining-tone . "꪿꫁"))))
+    ;; Set all TaiViet characters to `t'.
+    (set-char-table-range table (cons #xaa80 #xaac2) t)
+    (set-char-table-range table (cons #xaadb #xaadf) t)
+    ;; Overwrite it for special characters.
+    (dolist (elt specials)
+      (let ((category (car elt))
+            (chars (cdr elt)))
+        (dotimes (i (length chars))
+          (aset table (aref chars i) category))))
+    table))
+
+(defun tai-viet-compose-string (from to string)
+  "Compose Tai Viet characters in STRING between indices FROM and TO."
+  (let* ((ch (aref string from))
+         (info (aref tai-viet-glyph-info ch))
+         prev-info)
+    (if (eq info 'non-spacing)
+        (compose-string string from (1+ from) (string ch ?\t)))
+    (setq from (1+ from) prev-info info)
+    (while (and (< from to)
+                (tai-viet-char-p (setq ch (aref string from))))
+      (setq info (aref tai-viet-glyph-info ch))
+      (if (and (eq info 'non-spacing)
+               (eq prev-info 'non-spacing))
+          (compose-string from (1+ from) (string ?\t ch)))
+      (setq from (1+ from) prev-info info))
+    (if (eq info 'right-overhang)
+        (compose-string string (1- from) from (string ch ?\t)))
+    from))
+
+(defun tai-viet-compose-region (from to)
+  "Compose Tai Viet characters in the region between FROM and TO."
+  (decompose-region from to)
+  (let ((normal-rule '(Br . Bl))
+        (tone-rule '(tr . bl))
+        (prev-viet nil)
+        ch info pos components overhang)
+    (while (< from to) 
+      (or ch
+          (setq ch (char-after from)
+                info (aref tai-viet-glyph-info ch)))
+      (setq from (1+ from))
+      (if (not info)
+          (setq prev-viet nil
+                ch nil)
+        (if (memq info '(combining-vowel combining-tone))
+            (progn
+              ;; Display this as a spacing glyph.
+              (compose-region (1- from) from (string ?\t ch))
+              (setq prev-viet t
+                    ch nil))
+          (setq pos (1- from)
+                components ch
+                overhang (if (eq info 'right-overhang)
+                             'right-overhang
+                           (if (and (not prev-viet) (eq info 'left-overhang))
+                               'left-overhang))
+                prev-viet t
+                ch nil)
+          (if (and (< from to)
+                   (setq ch (char-after from)
+                         info (aref tai-viet-glyph-info ch)))
+              (if (memq info '(combining-vowel combining-tone))
+                  (progn
+                    (setq components
+                          (list components normal-rule ch)
+                          from (1+ from)
+                          ch nil)
+                    (if (and (< from to)
+                             (setq ch (char-after from)
+                                   info (aref tai-viet-glyph-info ch))
+                             (eq info 'combining-tone))
+                        (setq components (nconc components
+                                                (list tone-rule ch))
+                              from (1+ from)))
+                    (if (eq overhang 'left-overhang)
+                        (setq components (cons ?\t
+                                               (cons normal-rule components)))
+                      (if (and (eq overhang 'right-overhang)
+                               (>= from to))
+                          (setq components (nconc components
+                                                  (list normal-rule ?\t)))))
+                    (compose-region pos from components))
+                (if (eq overhang 'left-overhang)
+                    (compose-region pos from (string ?\t components))))
+            (if (eq overhang 'left-overhang)
+                (compose-region pos from (string ?\t components))
+              (if (and (eq overhang 'right-overhang) (>= from to))
+                  (compose-region pos from (string components ?\t))))))))
+    from))
+
+
+;;;###autoload
+(defun tai-viet-composition-function (pos &optional string)
+  (let (to)
+    (if string
+        (progn
+          (if (string-match tai-viet-re string pos)
+              (tai-viet-compose-string pos (match-end 0) string)
+            (1+ pos)))
+      (goto-char pos)
+      (if (looking-at tai-viet-re)
+          (tai-viet-compose-region pos (match-end 0))
+        (1+ pos)))))
+
+;;
+(provide 'tai-viet-util)