--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lisp/language/vietnamese.el	Mon Aug 13 09:41:43 2007 +0200
@@ -0,0 +1,261 @@
+;;; vietnamese.el --- Support for Vietnamese
+
+;; Copyright (C) 1995 Free Software Foundation, Inc.
+;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
+
+;; Keywords: multilingual, Vietnamese
+
+;; 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., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; For Vietnames, the character sets VISCII and VSCII are supported.
+
+;;; Code:
+
+(eval-when-compile
+
+(defvar viet-viscii-decode-table
+  [;; VISCII is a full 8-bit code.
+   0 1 ?,2F(B 3 4 ?,2G(B ?,2g(B 7 8 9 10 11 12 13 14 15
+   16 17 18 19 ?,2V(B 21 22 23 24 ?,2[(B 26 27 28 29 ?,2\(B 31
+   32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
+   48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
+   64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79
+   80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95
+   96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111
+   112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 
+   ?,2U(B ?,2!(B ?,2"(B ?,2#(B ?,2$(B ?,2%(B ?,2&(B ?,2'(B ?,2((B ?,2)(B ?,2*(B ?,2+(B ?,2,(B ?,2-(B ?,2.(B ?,2/(B
+   ?,20(B ?,21(B ?,22(B ?,25(B ?,2~(B ?,2>(B ?,26(B ?,27(B ?,28(B ?,2v(B ?,2w(B ?,2o(B ?,2|(B ?,2{(B ?,2x(B ?,2O(B
+   ?,2u(B ?,1!(B ?,1"(B ?,1#(B ?,1$(B ?,1%(B ?,1&(B ?,1'(B ?,1((B ?,1)(B ?,1*(B ?,1+(B ?,1,(B ?,1-(B ?,1.(B ?,1/(B
+   ?,10(B ?,11(B ?,12(B ?,2^(B ?,2=(B ?,15(B ?,16(B ?,17(B ?,18(B ?,2q(B ?,2Q(B ?,2W(B ?,2X(B ?,1=(B ?,1>(B ?,2_(B
+   ?,2`(B ?,2a(B ?,2b(B ?,2c(B ?,2d(B ?,2e(B ?,1F(B ?,1G(B ?,2h(B ?,2i(B ?,2j(B ?,2k(B ?,2l(B ?,2m(B ?,2n(B ?,1O(B
+   ?,2p(B ?,1Q(B ?,2r(B ?,2s(B ?,2t(B ?,1U(B ?,1V(B ?,1W(B ?,1X(B ?,2y(B ?,2z(B ?,1[(B ?,1\(B ?,2}(B ?,1^(B ?,1_(B
+   ?,1`(B ?,1a(B ?,1b(B ?,1c(B ?,1d(B ?,1e(B ?,1f(B ?,1g(B ?,1h(B ?,1i(B ?,1j(B ?,1k(B ?,1l(B ?,1m(B ?,1n(B ?,1o(B
+   ?,1p(B ?,1q(B ?,1r(B ?,1s(B ?,1t(B ?,1u(B ?,1v(B ?,1w(B ?,1x(B ?,1y(B ?,1z(B ?,1{(B ?,1|(B ?,1}(B ?,1~(B ?,2f(B ]
+  "Vietnamese VISCII encoding table.")
+
+(defvar viet-viscii-encode-table
+  (let ((table-lower (make-vector 128 0))
+	(table-upper (make-vector 128 0))
+	(i 0)
+	char-component)
+    (while (< i 256)
+      (setq char-component (split-char (aref viet-viscii-decode-table i)))
+      (cond ((eq (car char-component) 'vietnamese-viscii-lower)
+	     (aset table-lower (nth 1 char-component) i))
+	    ((eq (car char-component) 'vietnamese-viscii-upper)
+	     (aset table-upper (nth 1 char-component) i)))
+      (setq i (1+ i)))
+    (cons table-lower table-upper))
+  "Vietnamese VISCII decoding table.
+Cons of tables for decoding lower-case chars and upper-case characterss.
+Both tables are indexed by the position code of Vietnamese characters.")
+
+(defvar viet-vscii-decode-table
+  [;; VSCII is a full 8-bit code.
+   0 ?,2z(B ?,2x(B 3 ?,2W(B ?,2X(B ?,2f(B 7 8 9 10 11 12 13 14 15
+   16 ?,2Q(B ?,2_(B ?,2O(B ?,2V(B ?,2[(B ?,2}(B ?,2\(B 24 25 26 27 28 29 30 31
+   32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
+   48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
+   64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79
+   80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95
+   96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111
+   112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 
+   ?,2`(B ?,2d(B ?,2c(B ?,2a(B ?,2U(B ?,2#(B ?,2'(B ?,2h(B ?,2k(B ?,2((B ?,2i(B ?,2)(B ?,2.(B ?,2l(B ?,2o(B ?,2n(B
+   ?,2m(B ?,28(B ?,2r(B ?,2v(B ?,2u(B ?,2s(B ?,2w(B ?,25(B ?,26(B ?,27(B ?,2^(B ?,2>(B ?,2~(B ?,2y(B ?,2|(B ?,2{(B
+   160 ?,2e(B ?,2b(B ?,2j(B ?,2t(B ?,2=(B ?,2_(B ?,2p(B ?,1e(B ?,1b(B ?,1j(B ?,1t(B ?,1>(B ?,1y(B ?,1p(B ?,2"(B
+   192 193 194 195 196 ?,1`(B ?,1d(B ?,1c(B ?,1a(B ?,1U(B ?,2F(B ?,1"(B ?,1F(B ?,1G(B ?,1!(B ?,2G(B
+   ?,2!(B ?,2%(B ?,2&(B ?,2g(B ?,2%(B ?,2+(B ?,1#(B ?,1%(B ?,1&(B ?,1g(B ?,1$(B ?,1'(B ?,1h(B ?,2,(B ?,1k(B ?,1((B
+   ?,1i(B ?,1)(B ?,1+(B ?,1,(B ?,1-(B ?,1*(B ?,1.(B ?,1l(B ?,1o(B ?,2-(B ?,2*(B ?,20(B ?,1n(B ?,1m(B ?,18(B ?,1r(B
+   ?,21(B ?,1v(B ?,1u(B ?,1s(B ?,1w(B ?,10(B ?,11(B ?,12(B ?,1/(B ?,15(B ?,16(B ?,17(B ?,1^(B ?,1>(B ?,1~(B ?,1y(B
+   ?,22(B ?,1|(B ?,1{(B ?,1z(B ?,1x(B ?,1W(B ?,1X(B ?,1f(B ?,1Q(B ?,1q(B ?,1O(B ?,1V(B ?,1[(B ?,1}(B ?,1\(B ?,2/(B]
+  "Vietnamese VSCII code table.")
+
+(defvar viet-vscii-encode-table
+  (let ((table-lower (make-vector 128 0))
+	(table-upper (make-vector 128 0))
+	(i 0)
+	char-component)
+    (while (< i 256)
+      (setq char-component (split-char (aref viet-vscii-decode-table i)))
+      (cond ((eq (car char-component) 'vietnamese-viscii-lower)
+	     (aset table-lower (nth 1 char-component) i))
+	    ((eq (car char-component) 'vietnamese-viscii-upper)
+	     (aset table-upper (nth 1 char-component) i)))
+      (setq i (1+ i)))
+    (cons table-lower table-upper))
+  "Vietnamese VSCII decoding table.
+Cons of tables for decoding lower-case chars and upper-case characterss.
+Both tables are indexed by the position code of Vietnamese characters.")
+
+)
+
+(define-ccl-program ccl-decode-viscii
+  `(3
+    ((read r0)
+     (loop
+      (write-read-repeat r0 ,viet-viscii-decode-table))
+     ))
+  "CCL program to decode VISCII 1.1")
+
+;; Multibyte form of a Vietnamese character is as follows (3-byte):
+;;   LEADING-CODE-PRIVATE-11 LEADING-CODE-EXTENDED-11 POSITION-CODE
+;; where LEADING-CODE-EXTENDED-11 for Vietnamese is
+;; `vietnamese-viscii-lower' or `vietnamese-viscii-upper'.
+
+(define-ccl-program ccl-encode-viscii
+  `(1
+     ((read r0)
+      (loop
+       (if (r0 < 128)
+	   ;; ASCII
+	   (write-read-repeat r0)
+	 ;; not ASCII
+	 (if (r0 != ,leading-code-private-11)
+	     ;; not Vietnamese
+	     (write-read-repeat r0)
+	   ((read-if (r0 == ,(charset-id 'vietnamese-viscii-lower))
+	     (;; Vietnamese lower
+	      (read r0)
+	      (r0 -= 128)
+	      (write-read-repeat r0 ,(car viet-viscii-encode-table)))
+	     (if (r0 == ,(charset-id 'vietnamese-viscii-upper))
+		 (;; Vietnamese upper
+		  (read r0)
+		  (r0 -= 128)
+		  (write-read-repeat r0 ,(cdr viet-viscii-encode-table)))
+	       ;; not Vietnamese
+	       (write-read-repeat r0)))))))))
+  "CCL program to encode VISCII 1.1")
+
+(define-ccl-program ccl-encode-viscii-font
+  `(0
+    ;; In:  R0:vietnamese-viscii-lower/vietnamese-viscii-upper
+    ;;      R1:position code
+    ;; Out: R1:font code point
+    (if (r0 == ,(charset-id 'vietnamese-viscii-lower))
+	(r1 = r1 ,(car viet-viscii-encode-table))
+      (r1 = r1 ,(cdr viet-viscii-encode-table)))
+    )
+  "CCL program to encode Vietnamese chars to VISCII 1.1 font")
+
+(define-ccl-program ccl-decode-vscii
+  `(3
+    ((read r0)
+     (loop
+      (write-read-repeat r0 ,viet-vscii-decode-table))
+     ))
+  "CCL program to decode VSCII-1.")
+
+(define-ccl-program ccl-encode-vscii
+  `(1
+    ((read r0)
+     (loop
+      (if (r0 < 128)
+	  ;; ASCII
+	  (write-read-repeat r0)
+	;; not ASCII 
+	(if (r0 != ,leading-code-private-11)
+	    ;; not Vietnamese
+	    (write-read-repeat r0)
+	  (read-if (r0 == ,(charset-id 'vietnamese-viscii-lower))
+		   (;; Vietnamese lower
+		    (read r0)
+		    (r0 -= 128)
+		    (write-read-repeat r0 ,(car viet-vscii-encode-table)))
+		   (if (r0 == ,(charset-id 'vietnamese-viscii-upper))
+		       (;; Vietnamese upper
+			(read r0)
+			(r0 -= 128)
+			(write-read-repeat r0 ,(cdr viet-viscii-encode-table)))
+		     ;; not Vietnamese
+		     (write-read-repeat r0))))))))
+  "CCL program to encode VSCII-1.")
+
+(define-ccl-program ccl-encode-vscii-font
+  `(0
+    ;; In:  R0:vietnamese-viscii-lower/vietnamese-viscii-upper
+    ;;      R1:position code
+    ;; Out: R1:font code point
+    (if (r0 == ,(charset-id 'vietnamese-viscii-lower))
+	(r1 = r1 ,(car viet-vscii-encode-table))
+      (r1 = r1 ,(cdr viet-vscii-encode-table)))
+    )
+  "CCL program to encode Vietnamese chars to VSCII-1 font.")
+
+
+(make-coding-system
+ 'viscii 4 ?V
+ "Coding-system used for VISCII 1.1."
+ (cons ccl-decode-viscii ccl-encode-viscii))
+
+(make-coding-system
+ 'vscii 4 ?V
+ "Coding-system used for VSCII-1."
+ (cons ccl-decode-vscii ccl-encode-vscii))
+
+(make-coding-system
+ 'viqr 0 ?v
+ "Codins-system used for VIQR."
+ nil)
+(put 'viqr 'post-read-conversion 'viqr-post-read-conversion)
+(put 'viqr 'pre-write-conversion 'viqr-pre-write-conversion)
+
+(setq font-ccl-encoder-alist
+      (cons (cons "viscii" ccl-encode-viscii-font) font-ccl-encoder-alist))
+
+(setq font-ccl-encoder-alist
+      (cons (cons "vscii" ccl-encode-vscii-font) font-ccl-encoder-alist))
+
+(register-input-method
+ "Vietnamese" '("quail-viqr" quail-use-package "quail/viqr"))
+
+(defun setup-vietamese-environment ()
+  "Setup multilingual environment (MULE) for Vietnamese."
+  (interactive)
+  ;; for VISCII users
+  (setq coding-category-binary 'viscii)
+
+  ;; for VSCII users
+  ;; (setq coding-category-binary 'vscii)
+
+  (set-coding-priority
+   '(coding-category-iso-7
+     coding-category-binary))
+
+  (setq-default buffer-file-coding-system 'viscii)
+
+  (setq default-input-method '("Vietnamese" . "quail-viqr"))
+  )
+
+(defun describe-vietnamese-support ()
+  "Describe how Emacs supports Vietnamese."
+  (interactive)
+  (describe-langauge-support-internal "Vietnamese"))
+
+(set-language-info-alist
+ "Vietnamese" '((setup-function . setup-vietnamese-environment)
+		(describe-function . describe-vietnamese-support)
+		(charset . (vietnamese-viscii-lower
+			    vietnamese-viscii-upper))
+		(coding-system . (viscii vscii viqr))
+		(sample-text . "Vietnamese (Ti,1*(Bng Vi,1.(Bt)	Ch,1`(Bo b,1U(Bn")
+		(documentation . nil)))
+
+;;; vietnamese.el ends here