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date Mon, 13 Aug 2007 11:28:15 +0200
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1 ;;; coding.el --- Coding-system functions for XEmacs.
2
3 ;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
4 ;; Licensed to the Free Software Foundation.
5 ;; Copyright (C) 1995 Amdahl Corporation.
6 ;; Copyright (C) 1995 Sun Microsystems.
7 ;; Copyright (C) 1997 MORIOKA Tomohiko
8
9 ;; This file is part of XEmacs.
10
11 ;; This file is very similar to mule-coding.el
12
13 ;; XEmacs is free software; you can redistribute it and/or modify it
14 ;; under the terms of the GNU General Public License as published by
15 ;; the Free Software Foundation; either version 2, or (at your option)
16 ;; any later version.
17
18 ;; XEmacs is distributed in the hope that it will be useful, but
19 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 ;; General Public License for more details.
22
23 ;; You should have received a copy of the GNU General Public License
24 ;; along with XEmacs; see the file COPYING. If not, write to the
25 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
26 ;; Boston, MA 02111-1307, USA.
27
28 ;;; Commentary:
29
30 ;;; split off of mule.el.
31
32 ;;; Code:
33
34 (defalias 'check-coding-system 'get-coding-system)
35
36 (defconst modeline-multibyte-status '("%C")
37 "Modeline control for showing multibyte extension status.")
38
39 ;; override the default value defined in loaddefs.el.
40 (setq-default modeline-format
41 (cons (purecopy "")
42 (cons 'modeline-multibyte-status
43 (cdr modeline-format))))
44
45 (defun modify-coding-system-alist (target-type regexp coding-system)
46 "Modify one of look up tables for finding a coding system on I/O operation.
47 There are three of such tables, `file-coding-system-alist',
48 `process-coding-system-alist', and `network-coding-system-alist'.
49
50 TARGET-TYPE specifies which of them to modify.
51 If it is `file', it affects `file-coding-system-alist' (which see).
52 If it is `process', it affects `process-coding-system-alist' (which see).
53 If it is `network', it affects `network-codign-system-alist' (which see).
54
55 REGEXP is a regular expression matching a target of I/O operation.
56 The target is a file name if TARGET-TYPE is `file', a program name if
57 TARGET-TYPE is `process', or a network service name or a port number
58 to connect to if TARGET-TYPE is `network'.
59
60 CODING-SYSTEM is a coding system to perform code conversion on the I/O
61 operation, or a cons cell (DECODING . ENCODING) specifying the coding systems
62 for decoding and encoding respectively,
63 or a function symbol which, when called, returns such a cons cell."
64 (or (memq target-type '(file process network))
65 (error "Invalid target type: %s" target-type))
66 (or (stringp regexp)
67 (and (eq target-type 'network) (integerp regexp))
68 (error "Invalid regular expression: %s" regexp))
69 (if (symbolp coding-system)
70 (if (not (fboundp coding-system))
71 (progn
72 (check-coding-system coding-system)
73 (setq coding-system (cons coding-system coding-system))))
74 (check-coding-system (car coding-system))
75 (check-coding-system (cdr coding-system)))
76 (cond ((eq target-type 'file)
77 (let ((slot (assoc regexp file-coding-system-alist)))
78 (if slot
79 (setcdr slot coding-system)
80 (setq file-coding-system-alist
81 (cons (cons regexp coding-system)
82 file-coding-system-alist)))))
83 ((eq target-type 'process)
84 (let ((slot (assoc regexp process-coding-system-alist)))
85 (if slot
86 (setcdr slot coding-system)
87 (setq process-coding-system-alist
88 (cons (cons regexp coding-system)
89 process-coding-system-alist)))))
90 (t
91 (let ((slot (assoc regexp network-coding-system-alist)))
92 (if slot
93 (setcdr slot coding-system)
94 (setq network-coding-system-alist
95 (cons (cons regexp coding-system)
96 network-coding-system-alist)))))))
97
98 (defsubst keyboard-coding-system ()
99 "Return coding-system of what is sent from terminal keyboard."
100 keyboard-coding-system)
101
102 (defun set-keyboard-coding-system (coding-system)
103 "Set the coding system used for TTY keyboard input. Currently broken."
104 (interactive "zkeyboard-coding-system: ")
105 (get-coding-system coding-system) ; correctness check
106 (setq keyboard-coding-system coding-system)
107 (redraw-modeline t))
108
109 (defsubst terminal-coding-system ()
110 "Return coding-system of your terminal."
111 terminal-coding-system)
112
113 (defun set-terminal-coding-system (coding-system)
114 "Set the coding system used for TTY display output. Currently broken."
115 (interactive "zterminal-coding-system: ")
116 (get-coding-system coding-system) ; correctness check
117 (setq terminal-coding-system coding-system)
118 ; #### should this affect all current tty consoles ?
119 (if (eq (device-type) 'tty)
120 (set-console-tty-coding-system (device-console) terminal-coding-system))
121 (redraw-modeline t))
122
123 (defun set-pathname-coding-system (coding-system)
124 "Set the coding system used for file system path names."
125 (interactive "zPathname-coding-system: ")
126 (get-coding-system coding-system) ; correctness check
127 (setq file-name-coding-system coding-system))
128
129 (defun what-coding-system (start end &optional arg)
130 "Show the encoding of text in the region.
131 This function is meant to be called interactively;
132 from a Lisp program, use `detect-coding-region' instead."
133 (interactive "r\nP")
134 (princ (detect-coding-region start end)))
135
136 (defun decode-coding-string (str coding-system)
137 "Decode the string STR which is encoded in CODING-SYSTEM.
138 Does not modify STR. Returns the decoded string on successful conversion."
139 (with-string-as-buffer-contents
140 str (decode-coding-region (point-min) (point-max) coding-system)))
141
142 (defun encode-coding-string (str coding-system)
143 "Encode the string STR using CODING-SYSTEM.
144 Does not modify STR. Returns the encoded string on successful conversion."
145 (with-string-as-buffer-contents
146 str (encode-coding-region (point-min) (point-max) coding-system)))
147
148
149 ;;;; Coding system accessors
150
151 (defun coding-system-mnemonic (coding-system)
152 "Return the 'mnemonic property of CODING-SYSTEM."
153 (coding-system-property coding-system 'mnemonic))
154
155 (defalias 'coding-system-docstring 'coding-system-doc-string)
156
157 (defun coding-system-eol-type (coding-system)
158 "Return the 'eol-type property of CODING-SYSTEM."
159 (coding-system-property coding-system 'eol-type))
160
161 (defun coding-system-eol-lf (coding-system)
162 "Return the 'eol-lf property of CODING-SYSTEM."
163 (coding-system-property coding-system 'eol-lf))
164
165 (defun coding-system-eol-crlf (coding-system)
166 "Return the 'eol-crlf property of CODING-SYSTEM."
167 (coding-system-property coding-system 'eol-crlf))
168
169 (defun coding-system-eol-cr (coding-system)
170 "Return the 'eol-cr property of CODING-SYSTEM."
171 (coding-system-property coding-system 'eol-cr))
172
173 (defun coding-system-post-read-conversion (coding-system)
174 "Return the 'post-read-conversion property of CODING-SYSTEM."
175 (coding-system-property coding-system 'post-read-conversion))
176
177 (defun coding-system-pre-write-conversion (coding-system)
178 "Return the 'pre-write-conversion property of CODING-SYSTEM."
179 (coding-system-property coding-system 'pre-write-conversion))
180
181 (defun coding-system-base (coding-system)
182 "Return the base coding system of CODING-SYSTEM."
183 (if (not (coding-system-eol-type coding-system))
184 coding-system
185 (find-coding-system
186 (intern
187 (substring
188 (symbol-name (coding-system-name coding-system))
189 0
190 (string-match "-unix$\\|-dos$\\|-mac$"
191 (symbol-name (coding-system-name coding-system))))))))
192
193 ;;;; Definitions of predefined coding systems
194
195 (make-coding-system
196 'undecided 'undecided
197 "Automatic conversion."
198 '(mnemonic "Auto"))
199
200 ;; these are so that gnus and friends work when not mule
201 (or (featurep 'mule)
202 (progn
203 (copy-coding-system 'undecided 'iso-8859-1)
204 (copy-coding-system 'undecided 'iso-8859-2)))
205
206 ;; compatibility for old XEmacsen (don't use it)
207 (copy-coding-system 'undecided 'automatic-conversion)
208
209 (make-compatible-variable 'enable-multibyte-characters "Unimplemented")
210
211 (define-obsolete-variable-alias
212 'pathname-coding-system 'file-name-coding-system)
213
214 ;;; mule-coding.el ends here