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1 ;;; china-util.el --- utilities for Chinese
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2
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3 ;; Copyright (C) 1995 Free Software Foundation, Inc.
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4 ;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
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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 GNU Emacs.
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9
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10 ;; GNU Emacs is free software; you can redistribute it and/or modify
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11 ;; it 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 ;; GNU Emacs is distributed in the hope that it will be useful,
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16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ;; GNU 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 GNU Emacs; see the file COPYING. If not, write to the
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22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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23 ;; Boston, MA 02111-1307, USA.
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24
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25 ;;; Code:
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26
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27 ;; Hz/ZW encoding stuffs
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28
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29 ;; HZ is an encoding method for Chinese character set GB2312 used
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30 ;; widely in Internet. It is very similar to 7-bit environment of
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31 ;; ISO-2022. The difference is that HZ uses the sequence "~{" and
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32 ;; "~}" for designating GB2312 and ASCII respectively, hence, it
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33 ;; doesn't uses ESC (0x1B) code.
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34
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35 ;; ZW is another encoding method for Chinese character set GB2312. It
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36 ;; encodes Chinese characters line by line by starting each line with
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37 ;; the sequence "zW". It also uses only 7-bit as HZ.
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38
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39 ;; ISO-2022 escape sequence to designate GB2312.
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40 (defvar iso2022-gb-designation "\e$A")
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41 ;; HZ escape sequence to designate GB2312.
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42 (defvar hz-gb-designnation "~{")
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43 ;; ISO-2022 escape sequence to designate ASCII.
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44 (defvar iso2022-ascii-designation "\e(B")
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45 ;; HZ escape sequence to designate ASCII.
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46 (defvar hz-ascii-designnation "~}")
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47 ;; Regexp of ZW sequence to start GB2312.
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48 (defvar zw-start-gb "^zW")
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49 ;; Regexp for start of GB2312 in an encoding mixture of HZ and ZW.
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50 (defvar hz/zw-start-gb (concat hz-gb-designnation "\\|" zw-start-gb))
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51
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52 (defvar decode-hz-line-continuation nil
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53 "Flag to tell if we should care line continuation convention of Hz.")
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54
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55 ;;;###autoload
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56 (defun decode-hz-region (beg end)
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57 "Decode HZ/ZW encoded text in the current region.
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58 Return the length of resulting text."
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59 (interactive "r")
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60 (save-excursion
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61 (save-restriction
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62 (narrow-to-region beg end)
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63
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64 ;; We, at first, convert HZ/ZW to `iso-2022-7',
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65 ;; then decode it.
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66
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67 ;; "~\n" -> "\n"
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68 (goto-char (point-min))
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69 (while (search-forward "~" nil t)
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70 (if (= (following-char) ?\n) (delete-char -1))
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71 (if (not (eobp)) (forward-char 1)))
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72
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73 ;; "^zW...\n" -> Chinese GB2312
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74 ;; "~{...~}" -> Chinese GB2312
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75 (goto-char (point-min))
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76 (let ((chinese-found nil))
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77 (while (re-search-forward hz/zw-start-gb nil t)
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78 (if (= (char-after (match-beginning 0)) ?z)
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79 ;; ZW -> iso-20227-7
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80 (progn
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81 (delete-char -2)
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82 (insert iso2022-gb-designation)
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83 (end-of-line)
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84 (insert iso2022-ascii-designation))
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85 ;; HZ -> iso-20227-7
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86 (delete-char -2)
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87 (insert iso2022-gb-designation)
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88 (let ((pos (save-excursion (end-of-line) (point))))
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89 (if (search-forward hz-ascii-designnation pos t)
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90 (replace-match iso2022-ascii-designation)
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91 (if (not decode-hz-line-continuation)
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92 (insert iso2022-ascii-designation)))))
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93 (setq chinese-found t))
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94 (if (or chinese-found
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95 (let ((enable-multibyte-characters nil))
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96 ;; Here we check if the text contains EUC (China) codes.
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97 ;; If any, we had better decode them also.
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98 (goto-char (point-min))
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99 (re-search-forward "[\240-\377]" nil t)))
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100 (decode-coding-region (point-min) (point-max) 'cn-gb-2312)))
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101
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102 ;; "~~" -> "~"
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103 (goto-char (point-min))
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104 (while (search-forward "~~" nil t) (delete-char -1))
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105 (- (point-max) (point-min)))))
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106
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107 ;;;###autoload
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108 (defun decode-hz-buffer ()
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109 "Decode HZ/ZW encoded text in the current buffer."
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110 (interactive)
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111 (decode-hz-region (point-min) (point-max)))
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112
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113 ;;;###autoload
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114 (defun encode-hz-region (beg end)
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115 "Encode the text in the current region to HZ.
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116 Return the length of resulting text."
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117 (interactive "r")
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118 (save-excursion
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119 (save-restriction
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120 (narrow-to-region beg end)
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121
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122 ;; "~" -> "~~"
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123 (goto-char (point-min))
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124 (while (search-forward "~" nil t) (insert ?~))
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125
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126 ;; Chinese GB2312 -> "~{...~}"
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127 (goto-char (point-min))
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128 (if (re-search-forward "\\cc" nil t)
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129 (let ((enable-multibyte-characters nil)
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130 pos)
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131 (goto-char (setq pos (match-beginning 0)))
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132 (encode-coding-region pos (point-max) 'iso-2022-7)
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133 (goto-char pos)
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134 (while (search-forward iso2022-gb-designation nil t)
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135 (delete-char -3)
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136 (insert hz-gb-designnation))
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137 (goto-char pos)
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138 (while (search-forward iso2022-ascii-designation nil t)
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139 (delete-char -3)
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140 (insert hz-ascii-designnation))))
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141 (- (point-max) (point-min)))))
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142
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143 ;;;###autoload
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144 (defun encode-hz-buffer ()
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145 "Encode the text in the current buffer to HZ."
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146 (interactive)
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147 (encode-hz-region (point-min) (point-max)))
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148
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149 ;;
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150 (provide 'language/china-util)
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151
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152 ;;; Local Variables:
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153 ;;; generated-autoload-file: "../loaddefs.el"
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154 ;;; End:
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155 ;;; china-util.el ends here
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