1 ;;; mcs-20.el --- MIME charset implementation for Emacs 20 and XEmacs/mule
3 ;; Copyright (C) 1997,1998,1999,2000 Free Software Foundation, Inc.
5 ;; Author: MORIOKA Tomohiko <tomo@m17n.org>
6 ;; Keywords: emulation, compatibility, Mule
8 ;; This file is part of APEL (A Portable Emacs Library).
10 ;; This program is free software; you can redistribute it and/or
11 ;; modify it under the terms of the GNU General Public License as
12 ;; published by the Free Software Foundation; either version 2, or (at
13 ;; your option) any later version.
15 ;; This program is distributed in the hope that it will be useful, but
16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 ;; General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs; see the file COPYING. If not, write to the
22 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
23 ;; Boston, MA 02110-1301, USA.
27 ;; This module requires Emacs 20.0.93, XEmacs 20.3-b5 (with mule)
33 (eval-when-compile (require 'wid-edit))
35 (if (featurep 'xemacs)
43 (defcustom mime-charset-coding-system-alist
45 '((us-ascii . raw-text)
48 (iso-2022-jp-2 . iso-2022-7bit-ss2)
49 (iso-2022-jp-3 . iso-2022-7bit-ss2)
51 (windows-874 . tis-620)
55 (x-unknown . undecided)
59 (let ((pair (car rest)))
60 (or (find-coding-system (car pair))
61 (setq dest (cons pair dest))
63 (setq rest (cdr rest))
66 "Alist MIME CHARSET vs CODING-SYSTEM.
67 MIME CHARSET and CODING-SYSTEM must be symbol."
69 :type '(repeat (cons symbol coding-system)))
71 (defcustom mime-charset-to-coding-system-default-method
73 "Function called when suitable coding-system is not found from MIME-charset.
74 It must be nil or function.
75 If it is a function, interface must be (CHARSET LBT CODING-SYSTEM)."
77 :type '(choice function (const nil)))
79 (defun mime-charset-to-coding-system (charset &optional lbt)
80 "Return coding-system corresponding with CHARSET.
81 CHARSET is a symbol whose name is MIME charset.
82 If optional argument LBT (`CRLF', `LF', `CR', `unix', `dos' or `mac')
83 is specified, it is used as line break code type of coding-system."
85 (setq charset (intern (downcase charset)))
87 (let ((cs (assq charset mime-charset-coding-system-alist)))
93 (setq cs (intern (format "%s-%s" cs
94 (cond ((eq lbt 'CRLF) 'dos)
99 (if (find-coding-system cs)
101 (if mime-charset-to-coding-system-default-method
102 (funcall mime-charset-to-coding-system-default-method
106 (defalias 'mime-charset-p 'mime-charset-to-coding-system)
108 (defvar widget-mime-charset-prompt-value-history nil
109 "History of input to `widget-mime-charset-prompt-value'.")
111 (define-widget 'mime-charset 'coding-system
115 :prompt-history 'widget-mime-charset-prompt-value-history
116 :prompt-value 'widget-mime-charset-prompt-value
117 :action 'widget-mime-charset-action)
119 (defun widget-mime-charset-prompt-value (widget prompt value unbound)
120 ;; Read mime-charset from minibuffer.
122 (completing-read (format "%s (default %s) " prompt value)
125 (list (symbol-name sym))))
126 (mime-charset-list)))))
128 (defun widget-mime-charset-action (widget &optional event)
129 ;; Read a mime-charset from the minibuffer.
131 (widget-mime-charset-prompt-value
133 (widget-apply widget :menu-tag-get)
134 (widget-value widget)
136 (widget-value-set widget answer)
137 (widget-apply widget :notify widget event)
140 (defcustom default-mime-charset 'x-unknown
141 "Default value of MIME-charset.
142 It is used when MIME-charset is not specified.
147 (cond ((featurep 'utf-2000)
148 ;; for CHISE Architecture
149 (defun mcs-region-repertoire-p (start end charsets &optional buffer)
154 (narrow-to-region start end)
155 (goto-char (point-min))
159 (setq ch (char-after (point)))
160 (unless (some (lambda (ccs)
161 (encode-char ch ccs))
167 (defun mcs-string-repertoire-p (string charsets &optional start end)
170 (error 'args-out-of-range string start end)
175 (if (> end (length string))
176 (error 'args-out-of-range string start end))
177 (setq end (length string)))
180 (setq ch (aref string i))
181 (unless (some (lambda (ccs)
182 (encode-char ch ccs))
188 (defun detect-mime-charset-region (start end)
189 "Return MIME charset for region between START and END."
190 (let ((rest charsets-mime-charset-alist)
194 (setq cell (car rest))
195 (if (mcs-region-repertoire-p start end (car cell))
196 (throw 'tag (cdr cell)))
197 (setq rest (cdr rest)))
198 default-mime-charset-for-write)))
200 (defun detect-mime-charset-string (string)
201 "Return MIME charset for STRING."
202 (let ((rest charsets-mime-charset-alist)
206 (setq cell (car rest))
207 (if (mcs-string-repertoire-p string (car cell))
208 (throw 'tag (cdr cell)))
209 (setq rest (cdr rest)))
210 default-mime-charset-for-write)))
214 (defun detect-mime-charset-region (start end)
215 "Return MIME charset for region between START and END."
216 (find-mime-charset-by-charsets (find-charset-region start end)
220 (defun write-region-as-mime-charset (charset start end filename
221 &optional append visit lockname)
222 "Like `write-region', q.v., but encode by MIME CHARSET."
223 (let ((coding-system-for-write
224 (or (mime-charset-to-coding-system charset)
226 (write-region start end filename append visit lockname)))
233 (product-provide (provide 'mcs-20) (require 'apel-ver))
235 ;;; mcs-20.el ends here