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1 ;;; china-util.el --- utilities for Chinese -*- coding: iso-2022-7bit; -*-
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2
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3 ;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
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4 ;; Licensed to the Free Software Foundation.
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5
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6 ;; Keywords: mule, multilingual, Chinese
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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22 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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23 ;; 02111-1307, USA.
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24
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778
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25 ;;; Synched up with: Emacs 21.1 (language/china-util.el).
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26
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27 ;;; Commentary:
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771
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28
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29 ;;; Code:
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30
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31 ;; Hz/ZW encoding stuffs
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32
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33 ;; HZ is an encoding method for Chinese character set GB2312 used
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34 ;; widely in Internet. It is very similar to 7-bit environment of
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35 ;; ISO-2022. The difference is that HZ uses the sequence "~{" and
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36 ;; "~}" for designating GB2312 and ASCII respectively, hence, it
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37 ;; doesn't uses ESC (0x1B) code.
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38
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39 ;; ZW is another encoding method for Chinese character set GB2312. It
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40 ;; encodes Chinese characters line by line by starting each line with
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41 ;; the sequence "zW". It also uses only 7-bit as HZ.
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42
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43 ;; ISO-2022 escape sequence to designate GB2312.
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44 (defvar iso2022-gb-designation "\e$A")
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45 ;; HZ escape sequence to designate GB2312.
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46 (defvar hz-gb-designnation "~{")
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47 ;; ISO-2022 escape sequence to designate ASCII.
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48 (defvar iso2022-ascii-designation "\e(B")
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49 ;; HZ escape sequence to designate ASCII.
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50 (defvar hz-ascii-designnation "~}")
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51 ;; Regexp of ZW sequence to start GB2312.
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52 (defvar zw-start-gb "^zW")
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53 ;; Regexp for start of GB2312 in an encoding mixture of HZ and ZW.
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54 (defvar hz/zw-start-gb
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55 (concat hz-gb-designnation "\\|" zw-start-gb "\\|[^\0-\177]"))
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56
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57 (defvar decode-hz-line-continuation nil
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58 "Flag to tell if we should care line continuation convention of Hz.")
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59
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60 (defconst hz-set-msb-table
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61 (let ((str (make-string 127 0))
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62 (i 0))
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63 (while (< i 33)
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64 (aset str i i)
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65 (setq i (1+ i)))
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66 (while (< i 127)
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67 (aset str i (+ i 128))
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68 (setq i (1+ i)))
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69 str))
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70
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71 ;;;###autoload
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72 (defun decode-hz-region (beg end)
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73 "Decode HZ/ZW encoded text in the current region.
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74 Return the length of resulting text."
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75 (interactive "r")
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76 (save-excursion
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77 (save-restriction
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78 (let (pos ch)
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79 (narrow-to-region beg end)
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80
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81 ;; We, at first, convert HZ/ZW to `euc-china',
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82 ;; then decode it.
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83
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84 ;; "~\n" -> "\n", "~~" -> "~"
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85 (goto-char (point-min))
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86 (while (search-forward "~" nil t)
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87 (setq ch (following-char))
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88 (if (or (= ch ?\n) (= ch ?~)) (delete-char -1)))
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89
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90 ;; "^zW...\n" -> Chinese GB2312
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91 ;; "~{...~}" -> Chinese GB2312
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92 (goto-char (point-min))
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93 (setq beg nil)
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94 (while (re-search-forward hz/zw-start-gb nil t)
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95 (setq pos (match-beginning 0)
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96 ch (char-after pos))
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97 ;; Record the first position to start conversion.
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98 (or beg (setq beg pos))
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99 (end-of-line)
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100 (setq end (point))
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101 (if (>= ch 128) ; 8bit GB2312
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102 nil
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103 (goto-char pos)
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104 (delete-char 2)
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105 (setq end (- end 2))
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106 (if (= ch ?z) ; ZW -> euc-china
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107 (progn
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108 (translate-region (point) end hz-set-msb-table)
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109 (goto-char end))
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110 (if (search-forward hz-ascii-designnation
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111 (if decode-hz-line-continuation nil end)
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112 t)
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113 (delete-char -2))
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114 (setq end (point))
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115 (translate-region pos (point) hz-set-msb-table))))
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116 (if beg
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117 (decode-coding-region beg end 'euc-china)))
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118 (- (point-max) (point-min)))))
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119
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120 ;;;###autoload
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121 (defun decode-hz-buffer ()
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122 "Decode HZ/ZW encoded text in the current buffer."
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123 (interactive)
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124 (decode-hz-region (point-min) (point-max)))
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125
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126 ;;;###autoload
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127 (defun encode-hz-region (beg end)
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128 "Encode the text in the current region to HZ.
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129 Return the length of resulting text."
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130 (interactive "r")
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131 (save-excursion
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132 (save-restriction
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133 (narrow-to-region beg end)
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134
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135 ;; "~" -> "~~"
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136 (goto-char (point-min))
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137 (while (search-forward "~" nil t) (insert ?~))
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138
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139 ;; Chinese GB2312 -> "~{...~}"
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140 (goto-char (point-min))
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141 (if (re-search-forward "\\cc" nil t)
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142 (let (pos)
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143 (goto-char (setq pos (match-beginning 0)))
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144 (encode-coding-region pos (point-max) 'iso-2022-7bit)
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145 (goto-char pos)
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146 (while (search-forward iso2022-gb-designation nil t)
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147 (delete-char -3)
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148 (insert hz-gb-designnation))
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149 (goto-char pos)
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150 (while (search-forward iso2022-ascii-designation nil t)
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151 (delete-char -3)
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152 (insert hz-ascii-designnation))))
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153 (- (point-max) (point-min)))))
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154
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155 ;;;###autoload
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156 (defun encode-hz-buffer ()
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157 "Encode the text in the current buffer to HZ."
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158 (interactive)
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159 (encode-hz-region (point-min) (point-max)))
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160
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161 ;;
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162 (provide 'china-util)
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163
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164 ;;; china-util.el ends here
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