New file.

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)