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1 ;;; unicode.el --- Unicode support -*- coding: iso-2022-7bit; -*-
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2
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778
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3 ;; Copyright (C) 2001, 2002 Ben Wing.
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4
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5 ;; Keywords: multilingual, Unicode
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6
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7 ;; This file is part of XEmacs.
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8
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9 ;; XEmacs is free software; you can redistribute it and/or modify it
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10 ;; under the terms of the GNU General Public License as published by
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11 ;; the Free Software Foundation; either version 2, or (at your option)
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12 ;; any later version.
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13
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14 ;; XEmacs is distributed in the hope that it will be useful, but
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15 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 ;; General Public License for more details.
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18
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19 ;; You should have received a copy of the GNU General Public License
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20 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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21 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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22 ;; 02111-1307, USA.
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23
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24 ;;; Synched up with: Not in FSF.
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25
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26 ;;; Commentary:
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27
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28 ;; Lisp support for Unicode, e.g. initialize the translation tables.
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29
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30 ;;; Code:
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31
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3659
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32 ;; GNU Emacs has the charsets:
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33
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3659
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34 ;; mule-unicode-2500-33ff
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35 ;; mule-unicode-e000-ffff
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36 ;; mule-unicode-0100-24ff
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37
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38 ;; built-in. This is hack--and an incomplete hack at that--against the
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39 ;; spirit and the letter of standard ISO 2022 character sets. Instead of
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40 ;; this, we have the jit-ucs-charset-N Mule character sets, created in
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41 ;; unicode.c on encountering a Unicode code point that we don't recognise,
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42 ;; and saved in ISO 2022 coding systems using the UTF-8 escape described in
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43 ;; ISO-IR 196.
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44
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45 ;; accessed in loadup.el, mule-cmds.el; see discussion in unicode.c
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46 (defvar load-unicode-tables-at-dump-time (eq system-type 'windows-nt)
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47 "[INTERNAL] Whether to load the Unicode tables at dump time.
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48 Setting this at run-time does nothing.")
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49
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50 ;; NOTE: This takes only a fraction of a second on my Pentium III
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51 ;; 700Mhz even with a totally optimization-disabled XEmacs.
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52 (defun load-unicode-tables ()
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53 "Initialize the Unicode translation tables for all standard charsets."
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54 (let ((parse-args
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55 '(("unicode/unicode-consortium"
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56 ;; Due to the braindamaged way Mule treats the ASCII and Control-1
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57 ;; charsets' types, trying to load them results in out-of-range
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58 ;; warnings at unicode.c:1439. They're no-ops anyway, they're
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59 ;; hardwired in unicode.c (unicode_to_ichar, ichar_to_unicode).
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60 ;; ("8859-1.TXT" ascii #x00 #x7F #x0)
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61 ;; ("8859-1.TXT" control-1 #x80 #x9F #x-80)
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62 ;; The 8859-1.TXT G1 assignments are half no-ops, hardwired in
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63 ;; unicode.c ichar_to_unicode, but not in unicode_to_ichar.
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64 ("8859-1.TXT" latin-iso8859-1 #xA0 #xFF #x-80)
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65 ;; "8859-10.TXT"
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66 ;; "8859-13.TXT"
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67 ("8859-14.TXT" latin-iso8859-14 #xA0 #xFF #x-80)
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68 ("8859-15.TXT" latin-iso8859-15 #xA0 #xFF #x-80)
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69 ("8859-16.TXT" latin-iso8859-16 #xA0 #xFF #x-80)
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70 ("8859-2.TXT" latin-iso8859-2 #xA0 #xFF #x-80)
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71 ("8859-3.TXT" latin-iso8859-3 #xA0 #xFF #x-80)
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72 ("8859-4.TXT" latin-iso8859-4 #xA0 #xFF #x-80)
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73 ("8859-5.TXT" cyrillic-iso8859-5 #xA0 #xFF #x-80)
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74 ("8859-6.TXT" arabic-iso8859-6 #xA0 #xFF #x-80)
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75 ("8859-7.TXT" greek-iso8859-7 #xA0 #xFF #x-80)
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76 ("8859-8.TXT" hebrew-iso8859-8 #xA0 #xFF #x-80)
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77 ("8859-9.TXT" latin-iso8859-9 #xA0 #xFF #x-80)
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78 ;; charset for Big5 does not matter; specifying `big5' will
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79 ;; automatically make the right thing happen
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80 ("BIG5.TXT" chinese-big5-1 nil nil nil big5)
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81 ("CNS11643.TXT" chinese-cns11643-1 #x10000 #x1FFFF #x-10000)
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82 ("CNS11643.TXT" chinese-cns11643-2 #x20000 #x2FFFF #x-20000)
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83 ;; "CP1250.TXT"
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84 ;; "CP1251.TXT"
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85 ;; "CP1252.TXT"
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86 ;; "CP1253.TXT"
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87 ;; "CP1254.TXT"
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88 ;; "CP1255.TXT"
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89 ;; "CP1256.TXT"
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90 ;; "CP1257.TXT"
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91 ;; "CP1258.TXT"
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92 ;; "CP874.TXT"
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93 ;; "CP932.TXT"
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94 ;; "CP936.TXT"
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95 ;; "CP949.TXT"
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96 ;; "CP950.TXT"
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97 ;; "GB12345.TXT"
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98 ("GB2312.TXT" chinese-gb2312)
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99 ;; "HANGUL.TXT"
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100 ;; #### shouldn't JIS X 0201's upper limit be 7f?
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101 ("JIS0201.TXT" latin-jisx0201 #x21 #x80)
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102 ("JIS0201.TXT" katakana-jisx0201 #xA0 #xFF #x-80)
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103 ("JIS0208.TXT" japanese-jisx0208 nil nil nil ignore-first-column)
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104 ("JIS0212.TXT" japanese-jisx0212)
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105 ;; "JOHAB.TXT"
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106 ;; "KOI8-R.TXT"
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107 ;; "KSC5601.TXT"
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108 ;; note that KSC5601.TXT as currently distributed is NOT what
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109 ;; it claims to be! see comments in KSX1001.TXT.
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110 ("KSX1001.TXT" korean-ksc5601)
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111 ;; "OLD5601.TXT"
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112 ;; "SHIFTJIS.TXT"
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113 )
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114 ("unicode/mule-ucs"
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115 ;; #### we don't support surrogates?!??
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116 ;; use these instead of the above ones once we support surrogates
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117 ;;("chinese-cns11643-1.txt" chinese-cns11643-1)
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118 ;;("chinese-cns11643-2.txt" chinese-cns11643-2)
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119 ;;("chinese-cns11643-3.txt" chinese-cns11643-3)
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120 ;;("chinese-cns11643-4.txt" chinese-cns11643-4)
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121 ;;("chinese-cns11643-5.txt" chinese-cns11643-5)
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122 ;;("chinese-cns11643-6.txt" chinese-cns11643-6)
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123 ;;("chinese-cns11643-7.txt" chinese-cns11643-7)
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124 ("chinese-sisheng.txt" chinese-sisheng)
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125 ("ethiopic.txt" ethiopic)
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126 ("indian-is13194.txt" indian-is13194)
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127 ("ipa.txt" ipa)
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128 ("thai-tis620.txt" thai-tis620)
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129 ("tibetan.txt" tibetan)
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130 ("vietnamese-viscii-lower.txt" vietnamese-viscii-lower)
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131 ("vietnamese-viscii-upper.txt" vietnamese-viscii-upper)
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132 )
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133 ("unicode/other"
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134 ("lao.txt" lao)
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135 )
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136 )))
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137 (mapcar #'(lambda (tables)
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138 (let ((undir
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139 (expand-file-name (car tables) data-directory)))
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140 (mapcar #'(lambda (args)
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1318
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141 (apply 'load-unicode-mapping-table
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780
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142 (expand-file-name (car args) undir)
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143 (cdr args)))
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144 (cdr tables))))
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145 parse-args)))
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146
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147 (make-coding-system
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148 'utf-16 'unicode
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149 "UTF-16"
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150 '(mnemonic "UTF-16"
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151 documentation
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152 "UTF-16 Unicode encoding -- the standard (almost-) fixed-width
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153 two-byte encoding, with surrogates. It will be fixed-width if all
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154 characters are in the BMP (Basic Multilingual Plane -- first 65536
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155 codepoints). Cannot represent characters with codepoints above
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156 0x10FFFF (a little more than 1,000,000). Unicode and ISO guarantee
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157 never to encode any characters outside this range -- all the rest are
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158 for private, corporate or internal use."
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159 unicode-type utf-16))
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160
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161 (define-coding-system-alias 'utf-16-be 'utf-16)
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162
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163 (make-coding-system
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164 'utf-16-bom 'unicode
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165 "UTF-16 w/BOM"
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166 '(mnemonic "UTF16-BOM"
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167 documentation
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168 "UTF-16 Unicode encoding with byte order mark (BOM) at the beginning.
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169 The BOM is Unicode character U+FEFF -- i.e. the first two bytes are
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170 0xFE and 0xFF, respectively, or reversed in a little-endian
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171 representation. It has been sanctioned by the Unicode Consortium for
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172 use at the beginning of a Unicode stream as a marker of the byte order
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173 of the stream, and commonly appears in Unicode files under Microsoft
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174 Windows, where it also functions as a magic cookie identifying a
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175 Unicode file. The character is called \"ZERO WIDTH NO-BREAK SPACE\"
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176 and is suitable as a byte-order marker because:
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177
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178 -- it has no displayable representation
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179 -- due to its semantics it never normally appears at the beginning
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180 of a stream
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181 -- its reverse U+FFFE is not a legal Unicode character
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182 -- neither byte sequence is at all likely in any other standard
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183 encoding, particularly at the beginning of a stream
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184
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185 This coding system will insert a BOM at the beginning of a stream when
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186 writing and strip it off when reading."
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187 unicode-type utf-16
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188 need-bom t))
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189
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190 (make-coding-system
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191 'utf-16-little-endian 'unicode
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192 "UTF-16 Little Endian"
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193 '(mnemonic "UTF16-LE"
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194 documentation
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195 "Little-endian version of UTF-16 Unicode encoding.
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196 See `utf-16' coding system."
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197 unicode-type utf-16
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198 little-endian t))
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199
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200 (define-coding-system-alias 'utf-16-le 'utf-16-little-endian)
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201
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771
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202 (make-coding-system
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203 'utf-16-little-endian-bom 'unicode
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204 "UTF-16 Little Endian w/BOM"
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205 '(mnemonic "MSW-Unicode"
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206 documentation
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207 "Little-endian version of UTF-16 Unicode encoding, with byte order mark.
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208 Standard encoding for representing Unicode under MS Windows. See
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209 `utf-16-bom' coding system."
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210 unicode-type utf-16
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211 little-endian t
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212 need-bom t))
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213
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214 (make-coding-system
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215 'ucs-4 'unicode
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216 "UCS-4"
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217 '(mnemonic "UCS4"
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218 documentation
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219 "UCS-4 Unicode encoding -- fully fixed-width four-byte encoding."
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220 unicode-type ucs-4))
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221
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222 (make-coding-system
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223 'ucs-4-little-endian 'unicode
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224 "UCS-4 Little Endian"
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225 '(mnemonic "UCS4-LE"
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226 documentation
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227 ;; #### I don't think this is permitted by ISO 10646, only Unicode.
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228 ;; Call it UTF-32 instead?
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229 "Little-endian version of UCS-4 Unicode encoding. See `ucs-4' coding system."
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230 unicode-type ucs-4
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231 little-endian t))
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232
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233 (make-coding-system
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234 'utf-8 'unicode
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235 "UTF-8"
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236 '(mnemonic "UTF8"
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237 documentation "
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238 UTF-8 Unicode encoding -- ASCII-compatible 8-bit variable-width encoding
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239 sharing the following principles with the Mule-internal encoding:
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240
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241 -- All ASCII characters (codepoints 0 through 127) are represented
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242 by themselves (i.e. using one byte, with the same value as the
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243 ASCII codepoint), and these bytes are disjoint from bytes
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244 representing non-ASCII characters.
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245
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246 This means that any 8-bit clean application can safely process
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247 UTF-8-encoded text as it were ASCII, with no corruption (e.g. a
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248 '/' byte is always a slash character, never the second byte of
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249 some other character, as with Big5, so a pathname encoded in
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250 UTF-8 can safely be split up into components and reassembled
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251 again using standard ASCII processes).
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252
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253 -- Leading bytes and non-leading bytes in the encoding of a
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254 character are disjoint, so moving backwards is easy.
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255
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256 -- Given only the leading byte, you know how many following bytes
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257 are present.
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258 "
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259 unicode-type utf-8))
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260
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261 (make-coding-system
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262 'utf-8-bom 'unicode
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263 "UTF-8 w/BOM"
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264 '(mnemonic "MSW-UTF8"
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265 documentation
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266 "UTF-8 Unicode encoding, with byte order mark.
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267 Standard encoding for representing UTF-8 under MS Windows."
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268 unicode-type utf-8
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269 little-endian t
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270 need-bom t))
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271
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272 (defun decode-char (quote-ucs code &optional restriction)
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273 "FSF compatibility--return Mule character with Unicode codepoint CODE.
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274 The second argument must be 'ucs, the third argument is ignored. "
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275 (assert (eq quote-ucs 'ucs) t
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276 "Sorry, decode-char doesn't yet support anything but the UCS. ")
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277 (unicode-to-char code))
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278
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279 (defun encode-char (char quote-ucs &optional restriction)
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280 "FSF compatibility--return the Unicode code point of CHAR.
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281 The second argument must be 'ucs, the third argument is ignored. "
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282 (assert (eq quote-ucs 'ucs) t
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283 "Sorry, encode-char doesn't yet support anything but the UCS. ")
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284 (char-to-unicode char))
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285
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286 (when (featurep 'mule)
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287 ;; This CCL program is used for displaying the fallback UCS character set,
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288 ;; and can be repurposed to lao and the IPA, all going well.
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289 ;;
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290 ;; define-ccl-program is available after mule-ccl is loaded, much later
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291 ;; than this file in the build process. The below is the result of
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292 ;;
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293 ;; (macroexpand
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294 ;; '(define-ccl-program ccl-encode-to-ucs-2
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295 ;; `(1
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296 ;; ((r1 = (r1 << 8))
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297 ;; (r1 = (r1 | r2))
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298 ;; (mule-to-unicode r0 r1)
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299 ;; (r1 = (r0 >> 8))
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300 ;; (r2 = (r0 & 255))))
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301 ;; "CCL program to transform Mule characters to UCS-2."))
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302 ;;
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303 ;; and it should occasionally be confirmed that the correspondence still
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304 ;; holds.
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305
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306 (let ((prog [1 10 131127 8 98872 65823 147513 8 82009 255 22]))
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307 (defconst ccl-encode-to-ucs-2 prog
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308 "CCL program to transform Mule characters to UCS-2.")
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309 (put (quote ccl-encode-to-ucs-2) (quote ccl-program-idx)
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310 (register-ccl-program (quote ccl-encode-to-ucs-2) prog)) nil))
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311
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771
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312 ;; #### UTF-7 is not yet implemented, and it's tricky to do. There's
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313 ;; an implementation in appendix A.1 of the Unicode Standard, Version
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314 ;; 2.0, but I don't know its licensing characteristics.
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315
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316 ; (make-coding-system
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317 ; 'utf-7 'unicode
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318 ; "UTF-7"
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319 ; '(mnemonic "UTF7"
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320 ; documentation; "UTF-7 Unicode encoding -- 7-bit-ASCII modal Internet-mail-compatible
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321 ; encoding especially designed for headers, with the following
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322 ; properties:
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323
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324 ; -- Only characters that are considered safe for passing through any mail
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325 ; gateway without damage are used.
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326
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327 ; -- This is a modal encoding, with two states. The first, default
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328 ; state encodes the most common Unicode characters (upper and
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329 ; lowercase letters, digits, and 9 common punctuation marks) as
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330 ; themselves, and the second state, entered using '+' and
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331 ; terminated with '-' or any character disallowed in state 2,
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332 ; encodes any Unicode characters by first converting to UTF-16,
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333 ; most significant byte first, and then to a slightly modified
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334 ; Base64 encoding. (Thus, UTF-7 has the same limitations on the
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335 ; characters it can encode as UTF-16.)
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336
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337 ; -- The modified Base64 encoding deviates from standard Base64 in
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338 ; that it omits the `=' pad character. This is eliminated so as to
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339 ; avoid conflicts with the use of `=' as an escape in the
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340 ; Quoted-Printable encoding and the related Q encoding for headers:
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341 ; With this modification, non-whitespace chars in UTF-7 will be
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342 ; represented in Quoted-Printable and in Q as-is, with no further
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343 ; encoding.
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344
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345 ; For more information, see Appendix A.1 of The Unicode Standard 2.0, or
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346 ; wherever it is in v3.0."
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3767
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347 ; unicode-type utf-7))
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