+;;; vietnamese.el --- Support for Vietnamese
+
+;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
+;; Licensed to the Free Software Foundation.
+;; Copyright (C) 1997 MORIOKA Tomohiko
+
+;; Keywords: multilingual, Vietnamese
+
+;; This file is part of XEmacs.
+
+;; XEmacs 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.
+
+;; XEmacs 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 XEmacs; 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-and-compile
+
+(defvar viet-viscii-decode-table
+ [;; VISCII is a full 8-bit code.
+ 0 1 ?\e.2\eNF 3 4 ?\eNG ?\eNg 7 8 9 10 11 12 13 14 15
+ 16 17 18 19 ?\e.2\eNV 21 22 23 24 ?\eN[ 26 27 28 29 ?\eN\ 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
+ ?\e.2\eNU ?\eN! ?\eN" ?\eN# ?\eN$ ?\eN% ?\eN& ?\eN' ?\eN( ?\eN) ?\eN* ?\eN+ ?\eN, ?\eN- ?\eN. ?\eN/
+ ?\e.2\eN0 ?\eN1 ?\eN2 ?\eN5 ?\eN~ ?\eN> ?\eN6 ?\eN7 ?\eN8 ?\eNv ?\eNw ?\eNo ?\eN| ?\eN{ ?\eNx ?\eNO
+ ?\e.2\eNu ?\e.1\eN! ?\eN" ?\eN# ?\eN$ ?\eN% ?\eN& ?\eN' ?\eN( ?\eN) ?\eN* ?\eN+ ?\eN, ?\eN- ?\eN. ?\eN/
+ ?\e.1\eN0 ?\eN1 ?\eN2 ?\e.2\eN^ ?\eN= ?\e.1\eN5 ?\eN6 ?\eN7 ?\eN8 ?\e.2\eNq ?\eNQ ?\eNW ?\eNX ?\e.1\eN= ?\eN> ?\e.2\eN_
+ ?\e.2\eN` ?\eNa ?\eNb ?\eNc ?\eNd ?\eNe ?\e.1\eNF ?\eNG ?\e.2\eNh ?\eNi ?\eNj ?\eNk ?\eNl ?\eNm ?\eNn ?\e.1\eNO
+ ?\e.2\eNp ?\e.1\eNQ ?\e.2\eNr ?\eNs ?\eNt ?\e.1\eNU ?\eNV ?\eNW ?\eNX ?\e.2\eNy ?\eNz ?\e.1\eN[ ?\eN\ ?\e.2\eN} ?\e.1\eN^ ?\eN_
+ ?\e.1\eN` ?\eNa ?\eNb ?\eNc ?\eNd ?\eNe ?\eNf ?\eNg ?\eNh ?\eNi ?\eNj ?\eNk ?\eNl ?\eNm ?\eNn ?\eNo
+ ?\e.1\eNp ?\eNq ?\eNr ?\eNs ?\eNt ?\eNu ?\eNv ?\eNw ?\eNx ?\eNy ?\eNz ?\eN{ ?\eN| ?\eN} ?\eN~ ?\e.2\eNf ]
+ "Vietnamese VISCII decoding table.")
+
+(defun split-char-or-char-int (char)
+ "Return list of charset and one or two position-codes of CHAR.
+CHAR must be character or integer."
+ (if (characterp char)
+ (split-char char)
+ (let ((c (int-char char)))
+ (if c
+ (split-char c)
+ (list 'ascii c)
+ ))))
+
+(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-or-char-int (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 encoding table.
+Cons of tables for encoding lower-case chars and upper-case characters.
+Both tables are indexed by the position code of Vietnamese characters.")
+
+(defvar viet-vscii-decode-table
+ [;; VSCII is a full 8-bit code.
+ 0 ?\e.2\eNz ?\eNx 3 ?\eNW ?\eNX ?\eNf 7 8 9 10 11 12 13 14 15
+ 16 ?\e.2\eNQ ?\eN_ ?\eNO ?\eNV ?\eN[ ?\eN} ?\eN\ 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
+ ?\e.2\eN` ?\eNd ?\eNc ?\eNa ?\eNU ?\eN# ?\eN' ?\eNh ?\eNk ?\eN( ?\eNi ?\eN) ?\eN. ?\eNl ?\eNo ?\eNn
+ ?\e.2\eNm ?\eN8 ?\eNr ?\eNv ?\eNu ?\eNs ?\eNw ?\eN5 ?\eN6 ?\eN7 ?\eN^ ?\eN> ?\eN~ ?\eNy ?\eN| ?\eN{
+ 160 ?\e.2\eNe ?\eNb ?\eNj ?\eNt ?\eN= ?\eN_ ?\eNp ?\e.1\eNe ?\eNb ?\eNj ?\eNt ?\eN> ?\eNy ?\eNp ?\e.2\eN"
+ 192 193 194 195 196 ?\e.1\eN` ?\eNd ?\eNc ?\eNa ?\eNU ?\e.2\eNF ?\e.1\eN" ?\eNF ?\eNG ?\eN! ?\e.2\eNG
+ ?\e.2\eN! ?\eN% ?\eN& ?\eNg ?\eN% ?\eN+ ?\e.1\eN# ?\eN% ?\eN& ?\eNg ?\eN$ ?\eN' ?\eNh ?\e.2\eN, ?\e.1\eNk ?\eN(
+ ?\e.1\eNi ?\eN) ?\eN+ ?\eN, ?\eN- ?\eN* ?\eN. ?\eNl ?\eNo ?\e.2\eN- ?\eN* ?\eN0 ?\e.1\eNn ?\eNm ?\eN8 ?\eNr
+ ?\e.2\eN1 ?\e.1\eNv ?\eNu ?\eNs ?\eNw ?\eN0 ?\eN1 ?\eN2 ?\eN/ ?\eN5 ?\eN6 ?\eN7 ?\eN^ ?\eN> ?\eN~ ?\eNy
+ ?\e.2\eN2 ?\e.1\eN| ?\eN{ ?\eNz ?\eNx ?\eNW ?\eNX ?\eNf ?\eNQ ?\eNq ?\eNO ?\eNV ?\eN[ ?\eN} ?\eN\ ?\e.2\eN/]
+ "Vietnamese VSCII decoding 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-or-char-int (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 encoding table.
+Cons of tables for encoding lower-case chars and upper-case characters.
+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'.
+
+(defvar leading-code-private-11 #x9E)
+
+(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 'ccl
+ "Coding-system used for VISCII 1.1."
+ `(mnemonic "VISCII"
+ decode ,ccl-decode-viscii
+ encode ,ccl-encode-viscii))
+
+;; (make-coding-system
+;; 'vietnamese-viscii 4 ?V
+;; "8-bit encoding for Vietnamese VISCII 1.1 (MIME:VISCII)"
+;; (cons ccl-decode-viscii ccl-encode-viscii))
+
+;; (define-coding-system-alias 'viscii 'vietnamese-viscii)
+
+(make-coding-system
+ 'vscii 'ccl
+ "Coding-system used for VSCII 1.1."
+ `(mnemonic "VSCII"
+ decode ,ccl-decode-vscii
+ encode ,ccl-encode-vscii))
+
+;; (make-coding-system
+;; 'vietnamese-vscii 4 ?v
+;; "8-bit encoding for Vietnamese VSCII-1"
+;; (cons ccl-decode-vscii ccl-encode-vscii))
+
+;; (define-coding-system-alias 'vscii 'vietnamese-vscii)
+
+(make-coding-system
+ 'viqr 'no-conversion
+ "Coding-system used for VIQR."
+ '(mnemonic "VIQR"
+ eol-type lf
+ post-read-conversion viqr-post-read-conversion
+ pre-write-conversion viqr-pre-write-conversion))
+
+;; (make-coding-system
+;; 'vietnamese-viqr 0 ?q
+;; "Vietnamese latin transcription (VIQR)"
+;; nil)
+;; (put 'vietnamese-viqr 'post-read-conversion 'viqr-post-read-conversion)
+;; (put 'vietnamese-viqr 'pre-write-conversion 'viqr-pre-write-conversion)
+
+;; (define-coding-system-alias 'viqr 'vietnamese-viqr)
+
+;; For VISCII users
+(set-charset-ccl-program 'vietnamese-viscii-lower
+ ccl-encode-viscii-font)
+(set-charset-ccl-program 'vietnamese-viscii-upper
+ ccl-encode-viscii-font)
+;; For VSCII users
+(set-charset-ccl-program 'vietnamese-viscii-lower ccl-encode-vscii-font)
+(set-charset-ccl-program 'vietnamese-viscii-upper ccl-encode-vscii-font)
+
+;; (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))
+
+(set-language-info-alist
+ "Vietnamese" '((setup-function . setup-vietnamese-environment)
+ (charset . (vietnamese-viscii-lower
+ vietnamese-viscii-upper))
+ (coding-system . (viscii vscii viqr))
+ (sample-text . "Vietnamese (Ti\e.1\eN*ng Vi\eN.t) Ch\eN`o b\eNUn")
+ (documentation . "\
+For Vietnamese, Emacs uses special charasets internally.
+They can be decoded from and encoded to VISCC, VSCII, and VIQR.")
+ ))
+
+;;; vietnamese.el ends here