1 ;;; mm-util.el --- Utility functions for MIME things
2 ;; Copyright (C) 1998,99 Free Software Foundation, Inc.
4 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
5 ;; MORIOKA Tomohiko <morioka@jaist.ac.jp>
6 ;; This file is part of GNU Emacs.
8 ;; GNU Emacs is free software; you can redistribute it and/or modify
9 ;; it under the terms of the GNU General Public License as published by
10 ;; the Free Software Foundation; either version 2, or (at your option)
13 ;; GNU Emacs is distributed in the hope that it will be useful,
14 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 ;; GNU General Public License for more details.
18 ;; You should have received a copy of the GNU General Public License
19 ;; along with GNU Emacs; see the file COPYING. If not, write to the
20 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 ;; Boston, MA 02111-1307, USA.
27 (defvar mm-running-xemacs (string-match "XEmacs" emacs-version))
29 (defvar mm-running-ntemacs
30 (and (not mm-running-xemacs)
31 (string-match "nt" system-configuration)))
33 (defvar mm-binary-coding-system
35 'binary 'no-conversion)
36 "100% binary coding system.")
38 (defvar mm-text-coding-system
40 ((not (fboundp 'coding-system-p)) nil)
41 (mm-running-xemacs ;; XEmacs
42 (and (coding-system-p 'no-conversion) 'no-conversion))
43 (mm-running-ntemacs ;; NTEmacs
44 (and (coding-system-p 'raw-text-dos) 'raw-text-dos))
45 ((coding-system-p 'raw-text) 'raw-text) ;; Emacs
47 "100% text coding system, for removing ^M.")
49 (defvar mm-mime-mule-charset-alist
51 (iso-8859-1 latin-iso8859-1)
52 (iso-8859-2 latin-iso8859-2)
53 (iso-8859-3 latin-iso8859-3)
54 (iso-8859-4 latin-iso8859-4)
55 (iso-8859-5 cyrillic-iso8859-5)
56 (koi8-r cyrillic-iso8859-5)
57 (iso-8859-6 arabic-iso8859-6)
58 (iso-8859-7 greek-iso8859-7)
59 (iso-8859-8 hebrew-iso8859-8)
60 (iso-8859-9 latin-iso8859-9)
61 (iso-2022-jp-2 japanese-jisx0208)
62 (iso-2022-jp latin-jisx0201
63 japanese-jisx0208-1978)
64 (euc-kr korean-ksc5601)
65 (cn-gb-2312 chinese-gb2312)
66 (cn-big5 chinese-big5-1 chinese-big5-2)
67 (iso-2022-jp-2 latin-iso8859-1 greek-iso8859-7
68 latin-jisx0201 japanese-jisx0208-1978
69 chinese-gb2312 japanese-jisx0208
70 korean-ksc5601 japanese-jisx0212)
71 (iso-2022-int-1 latin-iso8859-1 greek-iso8859-7
72 latin-jisx0201 japanese-jisx0208-1978
73 chinese-gb2312 japanese-jisx0208
74 korean-ksc5601 japanese-jisx0212
75 chinese-cns11643-1 chinese-cns11643-2)
76 (iso-2022-int-1 latin-iso8859-1 latin-iso8859-2
77 cyrillic-iso8859-5 greek-iso8859-7
78 latin-jisx0201 japanese-jisx0208-1978
79 chinese-gb2312 japanese-jisx0208
80 korean-ksc5601 japanese-jisx0212
81 chinese-cns11643-1 chinese-cns11643-2
82 chinese-cns11643-3 chinese-cns11643-4
83 chinese-cns11643-5 chinese-cns11643-6
85 "Alist of MIME-charset/MULE-charsets.")
91 (let ((nfunc (intern (format "mm-%s" (car elem)))))
92 (if (fboundp (car elem))
93 (fset nfunc (car elem))
94 (fset nfunc (cdr elem)))))
95 '((decode-coding-string . (lambda (s a) s))
96 (encode-coding-string . (lambda (s a) s))
97 (encode-coding-region . ignore)
98 (coding-system-list . ignore)
99 (decode-coding-region . ignore)
100 (char-int . identity)
101 (device-type . ignore)
102 (coding-system-equal . equal)
103 (annotationp . ignore)
104 (set-buffer-file-coding-system . ignore)
106 . (lambda (charset int)
110 "Prompt the user for a coding system."
112 prompt (mapcar (lambda (s) (list (symbol-name (car s))))
113 mm-mime-mule-charset-alist)))))))
115 (defvar mm-coding-system-list nil)
116 (defun mm-get-coding-system-list ()
117 "Get the coding system list."
118 (or mm-coding-system-list
119 (setq mm-coding-system-list (mm-coding-system-list))))
121 (defvar mm-charset-coding-system-alist
123 '((gb2312 . cn-gb-2312)
124 (iso-2022-jp-2 . iso-2022-7bit-ss2)
126 (systems (mm-get-coding-system-list))
129 (let ((pair (car rest)))
130 (unless (memq (car pair) systems)
131 (setq dest (cons pair dest))))
132 (setq rest (cdr rest)))
134 "Charset/coding system alist.")
136 ;;; Internal variables:
140 (defun mm-mule-charset-to-mime-charset (charset)
141 "Return the MIME charset corresponding to MULE CHARSET."
142 (let ((alist mm-mime-mule-charset-alist)
145 (when (memq charset (cdar alist))
146 (setq out (caar alist)
151 (defun mm-charset-to-coding-system (charset &optional lbt)
152 "Return coding-system corresponding to CHARSET.
153 CHARSET is a symbol naming a MIME charset.
154 If optional argument LBT (`unix', `dos' or `mac') is specified, it is
155 used as the line break code type of the coding system."
156 (when (stringp charset)
157 (setq charset (intern (downcase charset))))
159 (or (cdr (assq charset mm-charset-coding-system-alist))
162 (setq charset (intern (format "%s-%s" charset lbt))))
164 ;; Running in a non-MULE environment.
165 ((null (mm-get-coding-system-list))
168 ((eq charset 'us-ascii)
170 ;; Check to see whether we can handle this charset.
171 ((memq charset (mm-get-coding-system-list))
177 (defun mm-replace-chars-in-string (string from to)
178 "Replace characters in STRING from FROM to TO."
179 (let ((string (substring string 0)) ;Copy string.
180 (len (length string))
182 ;; Replace all occurrences of FROM with TO.
184 (when (= (aref string idx) from)
185 (aset string idx to))
189 (defsubst mm-enable-multibyte ()
190 "Enable multibyte in the current buffer."
191 (when (and (fboundp 'set-buffer-multibyte)
192 (default-value 'enable-multibyte-characters))
193 (set-buffer-multibyte t)))
195 (defsubst mm-disable-multibyte ()
196 "Disable multibyte in the current buffer."
197 (when (fboundp 'set-buffer-multibyte)
198 (set-buffer-multibyte nil)))
200 (defun mm-mime-charset (charset b e)
201 (if (fboundp 'coding-system-get)
204 (get-charset-property charset 'prefered-coding-system)
206 (car (memq charset (find-coding-systems-region
207 (point-min) (point-max)))))
208 (mm-mule-charset-to-mime-charset charset)))
210 (defsubst mm-multibyte-p ()
211 "Say whether multibyte is enabled."
212 (and (boundp 'enable-multibyte-characters)
213 enable-multibyte-characters))
215 (defmacro mm-with-unibyte-buffer (&rest forms)
216 "Create a temporary buffer, and evaluate FORMS there like `progn'.
217 See also `with-temp-file' and `with-output-to-string'."
218 (let ((temp-buffer (make-symbol "temp-buffer"))
219 (multibyte (make-symbol "multibyte")))
220 `(if (not (boundp 'enable-multibyte-characters))
221 (with-temp-buffer ,@forms)
222 (let ((,multibyte (default-value 'enable-multibyte-characters))
226 (setq-default enable-multibyte-characters nil)
228 (get-buffer-create (generate-new-buffer-name " *temp*")))
230 (with-current-buffer ,temp-buffer
231 (let ((buffer-file-coding-system mm-binary-coding-system)
232 (coding-system-for-read mm-binary-coding-system)
233 (coding-system-for-write mm-binary-coding-system))
235 (and (buffer-name ,temp-buffer)
236 (kill-buffer ,temp-buffer))))
237 (setq-default enable-multibyte-characters ,multibyte))))))
238 (put 'mm-with-unibyte-buffer 'lisp-indent-function 0)
239 (put 'mm-with-unibyte-buffer 'edebug-form-spec '(body))
241 (defun mm-find-charset-region (b e)
242 "Return a list of charsets in the region."
244 ((and (boundp 'enable-multibyte-characters)
245 enable-multibyte-characters
246 (fboundp 'find-charset-region))
247 (find-charset-region b e))
248 ((not (boundp 'current-language-environment))
251 (narrow-to-region b e)
252 (goto-char (point-min))
253 (skip-chars-forward "\0-\177")
257 (list 'ascii 'latin-iso8859-1)))))
259 ;; We are in a unibyte buffer, so we futz around a bit.
262 (narrow-to-region b e)
263 (goto-char (point-min))
264 (let ((entry (assoc (capitalize current-language-environment)
265 language-info-alist)))
266 (skip-chars-forward "\0-\177")
269 (list 'ascii (car (last (assq 'charset entry)))))))))))
271 (defun mm-read-charset (prompt)
273 (completing-read prompt mm-mime-mule-charset-alist nil t))
277 ;;; mm-util.el ends here