;;; vietnamese.el --- support for Vietnamese -*- coding: iso-2022-7bit; -*-

;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
;; Licensed to the Free Software Foundation.

;; 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:

(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 decoding table.")

(let ((table (make-translation-table-from-vector viet-viscii-decode-table)))
  (define-translation-table 'viet-viscii-nonascii-translation-table table)
  (define-translation-table 'viet-viscii-encode-table
    (char-table-extra-slot table 0)))

(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 decoding table.")

(let ((table (make-translation-table-from-vector viet-vscii-decode-table)))
  (define-translation-table 'viet-vscii-nonascii-translation-table table)
  (define-translation-table 'viet-vscii-encode-table
    (char-table-extra-slot table 0)))

(define-ccl-program ccl-decode-viscii
  `(3
    ((loop
      (r0 = 0)
      (read r1)
      (translate-character viet-viscii-nonascii-translation-table r0 r1)
      (write-multibyte-character r0 r1)
      (repeat))))
  "CCL program to decode VISCII 1.1")

(define-ccl-program ccl-encode-viscii
  `(1
    ((loop
      (read-multibyte-character r0 r1)
      (translate-character viet-viscii-encode-table r0 r1)
      (write-repeat r1))))
  "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
    (translate-character viet-viscii-encode-table r0 r1))
  "CCL program to encode Vietnamese chars to VISCII 1.1 font")

(define-ccl-program ccl-decode-vscii
  `(3
    ((loop
      (r0 = 0)
      (read r1)
      (translate-character viet-vscii-nonascii-translation-table r0 r1)
      (write-multibyte-character r0 r1)
      (repeat))))
  "CCL program to decode VSCII-1.")

(define-ccl-program ccl-encode-vscii
  `(1
    ((loop
      (read-multibyte-character r0 r1)
      (translate-character viet-vscii-encode-table r0 r1)
      (write-repeat r1))))
  "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
    (translate-character viet-vscii-encode-table r0 r1))
  "CCL program to encode Vietnamese chars to VSCII-1 font.")


(make-coding-system
 'vietnamese-viscii 4 ?V
 "8-bit encoding for Vietnamese VISCII 1.1 (MIME:VISCII)"
 '(ccl-decode-viscii . ccl-encode-viscii)
 '((safe-charsets ascii vietnamese-viscii-lower vietnamese-viscii-upper)
   (mime-charset . viscii)
   (valid-codes (0 . 255))))

(define-coding-system-alias 'viscii 'vietnamese-viscii)

(make-coding-system
 'vietnamese-vscii 4 ?v
 "8-bit encoding for Vietnamese VSCII-1"
 '(ccl-decode-vscii . ccl-encode-vscii)
 '((safe-charsets ascii vietnamese-viscii-lower vietnamese-viscii-upper)
   (valid-codes (0 . 255))))

(define-coding-system-alias 'vscii 'vietnamese-vscii)

(make-coding-system
 'vietnamese-viqr 0 ?q
 "Vietnamese latin transcription (VIQR)"
 nil
 '((safe-charsets ascii vietnamese-viscii-lower vietnamese-viscii-upper)
   (post-read-conversion . viqr-post-read-conversion)
   (pre-write-conversion . viqr-pre-write-conversion)
   (charset-origin-alist
    (vietnamese-viscii-lower "VISCII" viet-encode-viscii-char)
    (vietnamese-viscii-upper "VISCII" viet-encode-viscii-char))))


(define-coding-system-alias 'viqr 'vietnamese-viqr)

(setq font-ccl-encoder-alist
      (cons '("viscii" . ccl-encode-viscii-font) font-ccl-encoder-alist))

(setq font-ccl-encoder-alist
      (cons '("vscii" . ccl-encode-vscii-font) font-ccl-encoder-alist))

(set-language-info-alist
 "Vietnamese" `((charset vietnamese-viscii-lower vietnamese-viscii-upper)
		(nonascii-translation
		 . ,(get 'viet-viscii-nonascii-translation-table
			 'translation-table))
		(coding-system vietnamese-viscii vietnamese-vscii
			       vietnamese-viqr)
		(coding-priority vietnamese-viscii)
		(input-method . "vietnamese-viqr")
		(unibyte-display . vietnamese-viscii)
		(features viet-util)
		(sample-text . "Vietnamese (Ti,1*(Bng Vi,1.(Bt)	Ch,1`(Bo b,1U(Bn")
		(documentation . "\
For Vietnamese, Emacs uses special charsets internally.
They can be decoded from and encoded to VISCC, VSCII, and VIQR.
Current setting puts higher priority to the coding system VISCII than VSCII.
If you prefer VSCII, please do: (prefer-coding-system 'vietnamese-vscii)")
		))

(provide 'vietnamese)

;;; vietnamese.el ends here
