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1 ;;; coding.el --- Coding-system functions for XEmacs.
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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) 1995 Amdahl Corporation.
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6 ;; Copyright (C) 1995 Sun Microsystems.
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7 ;; Copyright (C) 1997 MORIOKA Tomohiko
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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 ;; This file is very similar to mule-coding.el
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12
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13 ;; XEmacs is free software; you can redistribute it and/or modify it
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14 ;; under the terms of the GNU General Public License as published by
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15 ;; the Free Software Foundation; either version 2, or (at your option)
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16 ;; any later version.
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17
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18 ;; XEmacs is distributed in the hope that it will be useful, but
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19 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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21 ;; General Public License for more details.
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22
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23 ;; You should have received a copy of the GNU General Public License
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440
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24 ;; along with XEmacs; see the file COPYING. If not, write to the
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428
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25 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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26 ;; Boston, MA 02111-1307, USA.
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27
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28 ;;; Commentary:
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29
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30 ;;; split off of mule.el.
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31
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32 ;;; Code:
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33
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34 (defalias 'check-coding-system 'get-coding-system)
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35
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36 (defconst modeline-multibyte-status '("%C")
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37 "Modeline control for showing multibyte extension status.")
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38
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39 ;; override the default value defined in loaddefs.el.
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40 (setq-default modeline-format
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41 (cons (purecopy "")
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42 (cons 'modeline-multibyte-status
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43 (cdr modeline-format))))
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44
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45 (defun modify-coding-system-alist (target-type regexp coding-system)
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46 "Modify one of look up tables for finding a coding system on I/O operation.
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47 There are three of such tables, `file-coding-system-alist',
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48 `process-coding-system-alist', and `network-coding-system-alist'.
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49
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50 TARGET-TYPE specifies which of them to modify.
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51 If it is `file', it affects `file-coding-system-alist' (which see).
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52 If it is `process', it affects `process-coding-system-alist' (which see).
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53 If it is `network', it affects `network-codign-system-alist' (which see).
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54
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55 REGEXP is a regular expression matching a target of I/O operation.
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56 The target is a file name if TARGET-TYPE is `file', a program name if
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57 TARGET-TYPE is `process', or a network service name or a port number
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58 to connect to if TARGET-TYPE is `network'.
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59
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60 CODING-SYSTEM is a coding system to perform code conversion on the I/O
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61 operation, or a cons cell (DECODING . ENCODING) specifying the coding systems
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62 for decoding and encoding respectively,
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63 or a function symbol which, when called, returns such a cons cell."
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64 (or (memq target-type '(file process network))
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65 (error "Invalid target type: %s" target-type))
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66 (or (stringp regexp)
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67 (and (eq target-type 'network) (integerp regexp))
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68 (error "Invalid regular expression: %s" regexp))
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69 (if (symbolp coding-system)
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70 (if (not (fboundp coding-system))
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71 (progn
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72 (check-coding-system coding-system)
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73 (setq coding-system (cons coding-system coding-system))))
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74 (check-coding-system (car coding-system))
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75 (check-coding-system (cdr coding-system)))
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76 (cond ((eq target-type 'file)
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77 (let ((slot (assoc regexp file-coding-system-alist)))
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78 (if slot
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79 (setcdr slot coding-system)
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80 (setq file-coding-system-alist
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81 (cons (cons regexp coding-system)
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82 file-coding-system-alist)))))
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83 ((eq target-type 'process)
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84 (let ((slot (assoc regexp process-coding-system-alist)))
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85 (if slot
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86 (setcdr slot coding-system)
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87 (setq process-coding-system-alist
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88 (cons (cons regexp coding-system)
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89 process-coding-system-alist)))))
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90 (t
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91 (let ((slot (assoc regexp network-coding-system-alist)))
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92 (if slot
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93 (setcdr slot coding-system)
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94 (setq network-coding-system-alist
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95 (cons (cons regexp coding-system)
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96 network-coding-system-alist)))))))
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97
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98 (defsubst keyboard-coding-system ()
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99 "Return coding-system of what is sent from terminal keyboard."
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100 keyboard-coding-system)
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101
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102 (defun set-keyboard-coding-system (coding-system)
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103 "Set the coding system used for TTY keyboard input. Currently broken."
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104 (interactive "zkeyboard-coding-system: ")
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105 (get-coding-system coding-system) ; correctness check
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106 (setq keyboard-coding-system coding-system)
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107 (if (eq (device-type) 'tty)
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108 (set-console-tty-input-coding-system
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109 (device-console) keyboard-coding-system))
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110 (redraw-modeline t))
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111
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112 (defsubst terminal-coding-system ()
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113 "Return coding-system of your terminal."
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114 terminal-coding-system)
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115
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116 (defun set-terminal-coding-system (coding-system)
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117 "Set the coding system used for TTY display output. Currently broken."
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118 (interactive "zterminal-coding-system: ")
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119 (get-coding-system coding-system) ; correctness check
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120 (setq terminal-coding-system coding-system)
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121 ; #### should this affect all current tty consoles ?
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122 (if (eq (device-type) 'tty)
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123 (set-console-tty-output-coding-system
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124 (device-console) terminal-coding-system))
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125 (redraw-modeline t))
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126
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127 (defun set-pathname-coding-system (coding-system)
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128 "Set the coding system used for file system path names."
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129 (interactive "zPathname-coding-system: ")
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130 (get-coding-system coding-system) ; correctness check
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131 (setq file-name-coding-system coding-system))
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132
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133 (defun what-coding-system (start end &optional arg)
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134 "Show the encoding of text in the region.
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135 This function is meant to be called interactively;
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136 from a Lisp program, use `detect-coding-region' instead."
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137 (interactive "r\nP")
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138 (princ (detect-coding-region start end)))
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139
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140 (defun decode-coding-string (str coding-system)
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141 "Decode the string STR which is encoded in CODING-SYSTEM.
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142 Does not modify STR. Returns the decoded string on successful conversion."
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143 (with-string-as-buffer-contents
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144 str (decode-coding-region (point-min) (point-max) coding-system)))
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145
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146 (defun encode-coding-string (str coding-system)
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147 "Encode the string STR using CODING-SYSTEM.
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148 Does not modify STR. Returns the encoded string on successful conversion."
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149 (with-string-as-buffer-contents
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150 str (encode-coding-region (point-min) (point-max) coding-system)))
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151
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152
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153 ;;;; Coding system accessors
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154
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155 (defun coding-system-mnemonic (coding-system)
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156 "Return the 'mnemonic property of CODING-SYSTEM."
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157 (coding-system-property coding-system 'mnemonic))
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158
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159 (defalias 'coding-system-docstring 'coding-system-doc-string)
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160
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161 (defun coding-system-eol-type (coding-system)
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162 "Return the 'eol-type property of CODING-SYSTEM."
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163 (coding-system-property coding-system 'eol-type))
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164
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165 (defun coding-system-eol-lf (coding-system)
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166 "Return the 'eol-lf property of CODING-SYSTEM."
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167 (coding-system-property coding-system 'eol-lf))
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168
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169 (defun coding-system-eol-crlf (coding-system)
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170 "Return the 'eol-crlf property of CODING-SYSTEM."
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171 (coding-system-property coding-system 'eol-crlf))
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172
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173 (defun coding-system-eol-cr (coding-system)
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174 "Return the 'eol-cr property of CODING-SYSTEM."
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175 (coding-system-property coding-system 'eol-cr))
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176
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177 (defun coding-system-post-read-conversion (coding-system)
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178 "Return the 'post-read-conversion property of CODING-SYSTEM."
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179 (coding-system-property coding-system 'post-read-conversion))
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180
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181 (defun coding-system-pre-write-conversion (coding-system)
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182 "Return the 'pre-write-conversion property of CODING-SYSTEM."
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183 (coding-system-property coding-system 'pre-write-conversion))
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184
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185 (defun coding-system-base (coding-system)
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186 "Return the base coding system of CODING-SYSTEM."
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187 (if (not (coding-system-eol-type coding-system))
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188 coding-system
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189 (find-coding-system
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190 (intern
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191 (substring
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192 (symbol-name (coding-system-name coding-system))
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193 0
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194 (string-match "-unix$\\|-dos$\\|-mac$"
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195 (symbol-name (coding-system-name coding-system))))))))
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196
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197 ;;;; Definitions of predefined coding systems
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198
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199 (make-coding-system
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200 'undecided 'undecided
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201 "Automatic conversion."
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202 '(mnemonic "Auto"))
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203
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204 ;;; Make certain variables equivalent to coding-system aliases
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205 (defun dontusethis-set-value-file-name-coding-system-handler (sym args fun harg handlers)
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206 (define-coding-system-alias 'file-name (or (car args) 'binary)))
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207
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208 (dontusethis-set-symbol-value-handler
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209 'file-name-coding-system
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210 'set-value
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211 'dontusethis-set-value-file-name-coding-system-handler)
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212
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213 (defun dontusethis-set-value-terminal-coding-system-handler (sym args fun harg handlers)
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214 (define-coding-system-alias 'terminal (or (car args) 'binary)))
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215
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216 (dontusethis-set-symbol-value-handler
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217 'terminal-coding-system
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218 'set-value
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219 'dontusethis-set-value-terminal-coding-system-handler)
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220
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221 (defun dontusethis-set-value-keyboard-coding-system-handler (sym args fun harg handlers)
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222 (define-coding-system-alias 'keyboard (or (car args) 'binary)))
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223
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224 (dontusethis-set-symbol-value-handler
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225 'keyboard-coding-system
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226 'set-value
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227 'dontusethis-set-value-keyboard-coding-system-handler)
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228
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229 (unless (boundp 'file-name-coding-system)
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230 (setq file-name-coding-system nil))
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231
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232 (when (not (featurep 'mule))
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233 ;; these are so that gnus and friends work when not mule
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234 (copy-coding-system 'undecided 'iso-8859-1)
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235 (copy-coding-system 'undecided 'iso-8859-2)
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236
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237 (define-coding-system-alias 'ctext 'binary))
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238
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239
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240 ;; compatibility for old XEmacsen (don't use it)
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241 (copy-coding-system 'undecided 'automatic-conversion)
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242
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243 (make-compatible-variable 'enable-multibyte-characters "Unimplemented")
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244
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245 (define-obsolete-variable-alias
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246 'pathname-coding-system 'file-name-coding-system)
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247
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248 ;;; mule-coding.el ends here
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