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1 ;;; china-util.el --- utilities for Chinese
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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 ;; Copyright (C) 1997 MORIOKA Tomohiko
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6
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7 ;; Keywords: mule, multilingual, Chinese
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8
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9 ;; This file is part of XEmacs.
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10
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11 ;; XEmacs is free software; you can redistribute it and/or modify it
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12 ;; under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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23 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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24 ;; 02111-1307, USA.
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25
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26 ;;; Code:
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27
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28 ;;;###autoload
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29 (defun setup-chinese-gb-environment ()
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30 "Setup multilingual environment (MULE) for Chinese GB2312 users."
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31 (interactive)
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32 (setup-english-environment)
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33
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34 (set-default-coding-systems 'cn-gb-2312)
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35 ;; (setq coding-category-iso-8-2 'chinese-iso-8bit)
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36 (set-coding-category-system 'iso-8-2 'cn-gb-2312)
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37 ;; (setq coding-category-iso-7-else 'chinese-iso-7bit)
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38 ;; (setq coding-category-big5 'chinese-big5)
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39
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40 ;; (set-coding-priority
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41 ;; '(coding-category-iso-7
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42 ;; coding-category-iso-7-else
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43 ;; coding-category-iso-8-2
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44 ;; coding-category-big5
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45 ;; coding-category-iso-8-1
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46 ;; coding-category-emacs-mule
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47 ;; coding-category-iso-8-else))
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48 (set-coding-priority-list
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49 '(iso-7
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50 iso-8-2
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51 big5
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52 iso-8-1
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53 no-conversion
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54 iso-8-designate
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55 iso-lock-shift
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56 shift-jis))
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57
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58 ;; (when (eq 'x (device-type (selected-device)))
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59 ;; (x-use-halfwidth-roman-font 'chinese-gb2312 "gb1988"))))
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60 (when (featurep 'egg)
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61 (setq-default its:*current-map* (its:get-mode-map "PinYin")))
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62 (setq default-input-method "chinese-py-punct")
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63 )
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64
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65 ;;;###autoload
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66 (defun setup-chinese-big5-environment ()
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67 "Setup multilingual environment (MULE) for Chinese Big5 users."
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68 (interactive)
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69 (setup-english-environment)
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70
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71 (set-default-coding-systems 'big5)
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72 ;; (setq coding-category-iso-8-2 'chinese-big5)
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73 (set-coding-category-system 'iso-8-2 'cn-gb-2312)
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74 ;; (setq coding-category-iso-7-else 'chinese-iso-7bit)
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75 ;; (setq coding-category-big5 'chinese-big5)
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76
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77 ;; (set-coding-priority
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78 ;; '(coding-category-iso-7
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79 ;; coding-category-iso-7-else
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80 ;; coding-category-big5
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81 ;; coding-category-iso-8-2
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82 ;; coding-category-emacs-mule
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83 ;; coding-category-iso-8-else))
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84 (set-coding-priority-list
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85 '(iso-7
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86 big5
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87 iso-8-2
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88 no-conversion
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89 iso-8-1
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90 iso-8-designate
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91 iso-lock-shift
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92 shift-jis))
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93
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94 (setq default-input-method "chinese-py-punct-b5")
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95 )
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96
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97 ;; ;;;###autoload
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98 ;; (defun setup-chinese-cns-environment ()
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99 ;; "Setup multilingual environment (MULE) for Chinese CNS11643 family users."
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100 ;; (interactive)
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101 ;; (setup-english-environment)
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102 ;;
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103 ;; (setq coding-category-iso-7-else 'chinese-iso-7bit)
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104 ;; (setq coding-category-big5 'chinese-big5)
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105 ;; (setq coding-category-iso-8-2 'chinese-big5)
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106 ;; (set-default-coding-systems 'chinese-iso-7bit)
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107 ;;
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108 ;; (set-coding-priority
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109 ;; '(coding-category-iso-7
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110 ;; coding-category-iso-7-else
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111 ;; coding-category-iso-8-2
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112 ;; coding-category-big5
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113 ;; coding-category-iso-7-else))
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114 ;;
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115 ;; (setq-default buffer-file-coding-system 'chinese-iso-7bit)
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116 ;; (setq default-terminal-coding-system 'chinese-iso-7bit)
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117 ;; (setq default-keyboard-coding-system 'chinese-iso-7bit)
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118 ;;
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119 ;; (setq default-input-method "chinese-quick-cns"))
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120
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121 ;; Hz/ZW encoding stuffs
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122
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123 ;; HZ is an encoding method for Chinese character set GB2312 used
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124 ;; widely in Internet. It is very similar to 7-bit environment of
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125 ;; ISO-2022. The difference is that HZ uses the sequence "~{" and
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126 ;; "~}" for designating GB2312 and ASCII respectively, hence, it
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127 ;; doesn't uses ESC (0x1B) code.
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128
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129 ;; ZW is another encoding method for Chinese character set GB2312. It
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130 ;; encodes Chinese characters line by line by starting each line with
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131 ;; the sequence "zW". It also uses only 7-bit as HZ.
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132
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133 ;; ISO-2022 escape sequence to designate GB2312.
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134 (defvar iso2022-gb-designation "\e$A")
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135 ;; HZ escape sequence to designate GB2312.
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136 (defvar hz-gb-designnation "~{")
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137 ;; ISO-2022 escape sequence to designate ASCII.
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138 (defvar iso2022-ascii-designation "\e(B")
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139 ;; HZ escape sequence to designate ASCII.
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140 (defvar hz-ascii-designnation "~}")
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141 ;; Regexp of ZW sequence to start GB2312.
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142 (defvar zw-start-gb "^zW")
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143 ;; Regexp for start of GB2312 in an encoding mixture of HZ and ZW.
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144 (defvar hz/zw-start-gb (concat hz-gb-designnation "\\|" zw-start-gb))
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145
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146 (defvar decode-hz-line-continuation nil
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147 "Flag to tell if we should care line continuation convention of Hz.")
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148
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149 ;;;###autoload
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150 (defun decode-hz-region (beg end)
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151 "Decode HZ/ZW encoded text in the current region.
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152 Return the length of resulting text."
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153 (interactive "r")
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154 (save-excursion
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155 (save-restriction
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156 (narrow-to-region beg end)
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157
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158 ;; We, at first, convert HZ/ZW to `iso-2022-7bit',
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159
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159 ;; then decode it.
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160
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161 ;; "~\n" -> "\n"
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162 (goto-char (point-min))
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163 (while (search-forward "~" nil t)
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164 (if (= (following-char) ?\n) (delete-char -1))
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165 (if (not (eobp)) (forward-char 1)))
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166
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167 ;; "^zW...\n" -> Chinese GB2312
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168 ;; "~{...~}" -> Chinese GB2312
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169 (goto-char (point-min))
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170 (let ((chinese-found nil))
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171 (while (re-search-forward hz/zw-start-gb nil t)
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172 (if (= (char-after (match-beginning 0)) ?z)
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173 ;; ZW -> iso-2022-7bit
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174 (progn
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175 (delete-char -2)
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176 (insert iso2022-gb-designation)
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177 (end-of-line)
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178 (insert iso2022-ascii-designation))
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179 ;; HZ -> iso-2022-7bit
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180 (delete-char -2)
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181 (insert iso2022-gb-designation)
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182 (let ((pos (save-excursion (end-of-line) (point))))
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183 (if (search-forward hz-ascii-designnation pos t)
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184 (replace-match iso2022-ascii-designation)
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185 (if (not decode-hz-line-continuation)
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186 (insert iso2022-ascii-designation)))))
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187 (setq chinese-found t))
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188 (if (or chinese-found
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189 (let ((enable-multibyte-characters nil))
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190 ;; Here we check if the text contains EUC (China) codes.
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191 ;; If any, we had better decode them also.
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192 (goto-char (point-min))
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193 (re-search-forward "[\240-\377]" nil t)))
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194 (decode-coding-region (point-min) (point-max) 'euc-china)))
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195
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196 ;; "~~" -> "~"
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197 (goto-char (point-min))
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198 (while (search-forward "~~" nil t) (delete-char -1))
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199 (- (point-max) (point-min)))))
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200
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201 ;;;###autoload
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202 (defun decode-hz-buffer ()
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203 "Decode HZ/ZW encoded text in the current buffer."
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204 (interactive)
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205 (decode-hz-region (point-min) (point-max)))
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206
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207 ;;;###autoload
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208 (defun encode-hz-region (beg end)
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209 "Encode the text in the current region to HZ.
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210 Return the length of resulting text."
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211 (interactive "r")
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212 (save-excursion
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213 (save-restriction
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214 (narrow-to-region beg end)
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215
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216 ;; "~" -> "~~"
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217 (goto-char (point-min))
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218 (while (search-forward "~" nil t) (insert ?~))
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219
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220 ;; Chinese GB2312 -> "~{...~}"
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221 (goto-char (point-min))
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222 (if (re-search-forward "\\cc" nil t)
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223 (let ((enable-multibyte-characters nil)
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224 pos)
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225 (goto-char (setq pos (match-beginning 0)))
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226 (encode-coding-region pos (point-max) 'iso-2022-7bit)
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227 (goto-char pos)
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228 (while (search-forward iso2022-gb-designation nil t)
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229 (delete-char -3)
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230 (insert hz-gb-designnation))
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231 (goto-char pos)
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232 (while (search-forward iso2022-ascii-designation nil t)
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233 (delete-char -3)
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234 (insert hz-ascii-designnation))))
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235 (- (point-max) (point-min)))))
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236
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237 ;;;###autoload
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238 (defun encode-hz-buffer ()
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239 "Encode the text in the current buffer to HZ."
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240 (interactive)
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241 (encode-hz-region (point-min) (point-max)))
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242
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243 ;;
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244 (provide 'china-util)
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245
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246 ;;; china-util.el ends here
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