|
771
|
1 ;;; china-util.el --- utilities for Chinese -*- coding: iso-2022-7bit; -*-
|
|
|
2
|
|
|
3 ;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
|
|
|
4 ;; Licensed to the Free Software Foundation.
|
|
|
5
|
|
|
6 ;; Keywords: mule, multilingual, Chinese
|
|
|
7
|
|
|
8 ;; This file is part of XEmacs.
|
|
|
9
|
|
|
10 ;; XEmacs is free software; you can redistribute it and/or modify it
|
|
|
11 ;; under the terms of the GNU General Public License as published by
|
|
|
12 ;; the Free Software Foundation; either version 2, or (at your option)
|
|
|
13 ;; any later version.
|
|
|
14
|
|
|
15 ;; XEmacs is distributed in the hope that it will be useful, but
|
|
|
16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
|
18 ;; General Public License for more details.
|
|
|
19
|
|
|
20 ;; You should have received a copy of the GNU General Public License
|
|
|
21 ;; along with XEmacs; see the file COPYING. If not, write to the Free
|
|
|
22 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
|
|
|
23 ;; 02111-1307, USA.
|
|
|
24
|
|
|
25 ;;; Synched up with: Emacs 21.0.103 (language/china-util.el).
|
|
|
26
|
|
|
27 ;;; Code:
|
|
|
28
|
|
|
29 ;; Hz/ZW encoding stuffs
|
|
|
30
|
|
|
31 ;; HZ is an encoding method for Chinese character set GB2312 used
|
|
|
32 ;; widely in Internet. It is very similar to 7-bit environment of
|
|
|
33 ;; ISO-2022. The difference is that HZ uses the sequence "~{" and
|
|
|
34 ;; "~}" for designating GB2312 and ASCII respectively, hence, it
|
|
|
35 ;; doesn't uses ESC (0x1B) code.
|
|
|
36
|
|
|
37 ;; ZW is another encoding method for Chinese character set GB2312. It
|
|
|
38 ;; encodes Chinese characters line by line by starting each line with
|
|
|
39 ;; the sequence "zW". It also uses only 7-bit as HZ.
|
|
|
40
|
|
|
41 ;; ISO-2022 escape sequence to designate GB2312.
|
|
|
42 (defvar iso2022-gb-designation "\e$A")
|
|
|
43 ;; HZ escape sequence to designate GB2312.
|
|
|
44 (defvar hz-gb-designnation "~{")
|
|
|
45 ;; ISO-2022 escape sequence to designate ASCII.
|
|
|
46 (defvar iso2022-ascii-designation "\e(B")
|
|
|
47 ;; HZ escape sequence to designate ASCII.
|
|
|
48 (defvar hz-ascii-designnation "~}")
|
|
|
49 ;; Regexp of ZW sequence to start GB2312.
|
|
|
50 (defvar zw-start-gb "^zW")
|
|
|
51 ;; Regexp for start of GB2312 in an encoding mixture of HZ and ZW.
|
|
|
52 (defvar hz/zw-start-gb
|
|
|
53 (concat hz-gb-designnation "\\|" zw-start-gb "\\|[^\0-\177]"))
|
|
|
54
|
|
|
55 (defvar decode-hz-line-continuation nil
|
|
|
56 "Flag to tell if we should care line continuation convention of Hz.")
|
|
|
57
|
|
|
58 (defconst hz-set-msb-table
|
|
|
59 (let ((str (make-string 127 0))
|
|
|
60 (i 0))
|
|
|
61 (while (< i 33)
|
|
|
62 (aset str i i)
|
|
|
63 (setq i (1+ i)))
|
|
|
64 (while (< i 127)
|
|
|
65 (aset str i (+ i 128))
|
|
|
66 (setq i (1+ i)))
|
|
|
67 str))
|
|
|
68
|
|
|
69 ;;;###autoload
|
|
|
70 (defun decode-hz-region (beg end)
|
|
|
71 "Decode HZ/ZW encoded text in the current region.
|
|
|
72 Return the length of resulting text."
|
|
|
73 (interactive "r")
|
|
|
74 (save-excursion
|
|
|
75 (save-restriction
|
|
|
76 (let (pos ch)
|
|
|
77 (narrow-to-region beg end)
|
|
|
78
|
|
|
79 ;; We, at first, convert HZ/ZW to `euc-china',
|
|
|
80 ;; then decode it.
|
|
|
81
|
|
|
82 ;; "~\n" -> "\n", "~~" -> "~"
|
|
|
83 (goto-char (point-min))
|
|
|
84 (while (search-forward "~" nil t)
|
|
|
85 (setq ch (following-char))
|
|
|
86 (if (or (= ch ?\n) (= ch ?~)) (delete-char -1)))
|
|
|
87
|
|
|
88 ;; "^zW...\n" -> Chinese GB2312
|
|
|
89 ;; "~{...~}" -> Chinese GB2312
|
|
|
90 (goto-char (point-min))
|
|
|
91 (setq beg nil)
|
|
|
92 (while (re-search-forward hz/zw-start-gb nil t)
|
|
|
93 (setq pos (match-beginning 0)
|
|
|
94 ch (char-after pos))
|
|
|
95 ;; Record the first position to start conversion.
|
|
|
96 (or beg (setq beg pos))
|
|
|
97 (end-of-line)
|
|
|
98 (setq end (point))
|
|
|
99 (if (>= ch 128) ; 8bit GB2312
|
|
|
100 nil
|
|
|
101 (goto-char pos)
|
|
|
102 (delete-char 2)
|
|
|
103 (setq end (- end 2))
|
|
|
104 (if (= ch ?z) ; ZW -> euc-china
|
|
|
105 (progn
|
|
|
106 (translate-region (point) end hz-set-msb-table)
|
|
|
107 (goto-char end))
|
|
|
108 (if (search-forward hz-ascii-designnation
|
|
|
109 (if decode-hz-line-continuation nil end)
|
|
|
110 t)
|
|
|
111 (delete-char -2))
|
|
|
112 (setq end (point))
|
|
|
113 (translate-region pos (point) hz-set-msb-table))))
|
|
|
114 (if beg
|
|
|
115 (decode-coding-region beg end 'euc-china)))
|
|
|
116 (- (point-max) (point-min)))))
|
|
|
117
|
|
|
118 ;;;###autoload
|
|
|
119 (defun decode-hz-buffer ()
|
|
|
120 "Decode HZ/ZW encoded text in the current buffer."
|
|
|
121 (interactive)
|
|
|
122 (decode-hz-region (point-min) (point-max)))
|
|
|
123
|
|
|
124 ;;;###autoload
|
|
|
125 (defun encode-hz-region (beg end)
|
|
|
126 "Encode the text in the current region to HZ.
|
|
|
127 Return the length of resulting text."
|
|
|
128 (interactive "r")
|
|
|
129 (save-excursion
|
|
|
130 (save-restriction
|
|
|
131 (narrow-to-region beg end)
|
|
|
132
|
|
|
133 ;; "~" -> "~~"
|
|
|
134 (goto-char (point-min))
|
|
|
135 (while (search-forward "~" nil t) (insert ?~))
|
|
|
136
|
|
|
137 ;; Chinese GB2312 -> "~{...~}"
|
|
|
138 (goto-char (point-min))
|
|
|
139 (if (re-search-forward "\\cc" nil t)
|
|
|
140 (let (pos)
|
|
|
141 (goto-char (setq pos (match-beginning 0)))
|
|
|
142 (encode-coding-region pos (point-max) 'iso-2022-7bit)
|
|
|
143 (goto-char pos)
|
|
|
144 (while (search-forward iso2022-gb-designation nil t)
|
|
|
145 (delete-char -3)
|
|
|
146 (insert hz-gb-designnation))
|
|
|
147 (goto-char pos)
|
|
|
148 (while (search-forward iso2022-ascii-designation nil t)
|
|
|
149 (delete-char -3)
|
|
|
150 (insert hz-ascii-designnation))))
|
|
|
151 (- (point-max) (point-min)))))
|
|
|
152
|
|
|
153 ;;;###autoload
|
|
|
154 (defun encode-hz-buffer ()
|
|
|
155 "Encode the text in the current buffer to HZ."
|
|
|
156 (interactive)
|
|
|
157 (encode-hz-region (point-min) (point-max)))
|
|
|
158
|
|
|
159 ;;
|
|
|
160 (provide 'china-util)
|
|
|
161
|
|
|
162 ;;; china-util.el ends here
|
