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;;; mcs-om.el --- MIME charset implementation for Mule 1.* and Mule 2.*
;; Copyright (C) 1995,1996,1997,1998 MORIOKA Tomohiko
;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
;; Keywords: emulation, compatibility, Mule
;; This file is part of APEL (A Portable Emacs Library).
;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the GNU General Public License as
;; published by the Free Software Foundation; either version 2, or (at
;; your option) any later version.
;; This program is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;; General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Code:
(require 'poem)
(defsubst lbt-to-string (lbt)
(cdr (assq lbt '((nil . nil)
(CRLF . "\r\n")
(CR . "\r")
(dos . "\r\n")
(mac . "\r"))))
)
(defun encode-mime-charset-region (start end charset &optional lbt)
"Encode the text between START and END as MIME CHARSET."
(let ((cs (mime-charset-to-coding-system charset lbt)))
(if cs
(code-convert start end *internal* cs)
(if (and lbt (setq cs (mime-charset-to-coding-system charset)))
(let ((newline (lbt-to-string lbt)))
(save-excursion
(save-restriction
(narrow-to-region start end)
(code-convert (point-min) (point-max) *internal* cs)
(if newline
(goto-char (point-min))
(while (search-forward "\n" nil t)
(replace-match newline))))))))))
(defun decode-mime-charset-region (start end charset &optional lbt)
"Decode the text between START and END as MIME CHARSET."
(let ((cs (mime-charset-to-coding-system charset lbt)))
(if cs
(code-convert start end cs *internal*)
(if (and lbt (setq cs (mime-charset-to-coding-system charset)))
(let ((newline (lbt-to-string lbt)))
(if newline
(save-excursion
(save-restriction
(narrow-to-region start end)
(goto-char (point-min))
(while (search-forward newline nil t)
(replace-match "\n")))
(code-convert (point-min) (point-max) cs *internal*))
(code-convert start end cs *internal*)))))))
(defun encode-mime-charset-string (string charset &optional lbt)
"Encode the STRING as MIME CHARSET."
(let ((cs (mime-charset-to-coding-system charset lbt)))
(if cs
(code-convert-string string *internal* cs)
(if (and lbt (setq cs (mime-charset-to-coding-system charset)))
(let ((newline (lbt-to-string lbt)))
(if newline
(with-temp-buffer
(insert string)
(code-convert (point-min) (point-max) *internal* cs)
(goto-char (point-min))
(while (search-forward "\n" nil t)
(replace-match newline))
(buffer-string))
(decode-coding-string string cs)))
string))))
(defun decode-mime-charset-string (string charset &optional lbt)
"Decode the STRING which is encoded in MIME CHARSET."
(let ((cs (mime-charset-to-coding-system charset lbt)))
(if cs
(decode-coding-string string cs)
(if (and lbt (setq cs (mime-charset-to-coding-system charset)))
(let ((newline (lbt-to-string lbt)))
(if newline
(with-temp-buffer
(insert string)
(goto-char (point-min))
(while (search-forward newline nil t)
(replace-match "\n"))
(code-convert (point-min) (point-max) cs *internal*)
(buffer-string))
(decode-coding-string string cs)))
string))))
(cond
((and (>= emacs-major-version 19) (>= emacs-minor-version 29))
;; for MULE 2.3 based on Emacs 19.34.
(defun write-region-as-mime-charset (charset start end filename
&optional append visit lockname)
"Like `write-region', q.v., but code-convert by MIME CHARSET."
(let ((file-coding-system
(or (mime-charset-to-coding-system charset)
*noconv*)))
(write-region start end filename append visit lockname)))
)
(t
;; for MULE 2.3 based on Emacs 19.28.
(defun write-region-as-mime-charset (charset start end filename
&optional append visit lockname)
"Like `write-region', q.v., but code-convert by MIME CHARSET."
(let ((file-coding-system
(or (mime-charset-to-coding-system charset)
*noconv*)))
(write-region start end filename append visit)))
))
;;; @ to coding-system
;;;
(condition-case nil
(require 'cyrillic)
(error nil))
(defvar mime-charset-coding-system-alist
'((iso-8859-1 . *ctext*)
(x-ctext . *ctext*)
(gb2312 . *euc-china*)
(koi8-r . *koi8*)
(iso-2022-jp-2 . *iso-2022-ss2-7*)
(x-iso-2022-jp-2 . *iso-2022-ss2-7*)
(shift_jis . *sjis*)
(x-shiftjis . *sjis*)
))
(defsubst mime-charset-to-coding-system (charset &optional lbt)
"Return coding-system corresponding with CHARSET.
CHARSET is a symbol whose name is MIME charset.
If optional argument LBT (`CRLF', `LF', `CR', `unix', `dos' or `mac')
is specified, it is used as line break code type of coding-system."
(if (stringp charset)
(setq charset (intern (downcase charset)))
)
(setq charset (or (cdr (assq charset mime-charset-coding-system-alist))
(intern (concat "*" (symbol-name charset) "*"))))
(if lbt
(setq charset (intern (format "%s%s" charset
(cond ((eq lbt 'CRLF) 'dos)
((eq lbt 'LF) 'unix)
((eq lbt 'CR) 'mac)
(t lbt)))))
)
(if (coding-system-p charset)
charset
))
;;; @ detection
;;;
(defvar charsets-mime-charset-alist
(let ((alist
'(((lc-ascii) . us-ascii)
((lc-ascii lc-ltn1) . iso-8859-1)
((lc-ascii lc-ltn2) . iso-8859-2)
((lc-ascii lc-ltn3) . iso-8859-3)
((lc-ascii lc-ltn4) . iso-8859-4)
;;; ((lc-ascii lc-crl) . iso-8859-5)
((lc-ascii lc-crl) . koi8-r)
((lc-ascii lc-arb) . iso-8859-6)
((lc-ascii lc-grk) . iso-8859-7)
((lc-ascii lc-hbw) . iso-8859-8)
((lc-ascii lc-ltn5) . iso-8859-9)
((lc-ascii lc-roman lc-jpold lc-jp) . iso-2022-jp)
((lc-ascii lc-kr) . euc-kr)
((lc-ascii lc-cn) . gb2312)
((lc-ascii lc-big5-1 lc-big5-2) . big5)
((lc-ascii lc-roman lc-ltn1 lc-grk
lc-jpold lc-cn lc-jp lc-kr
lc-jp2) . iso-2022-jp-2)
((lc-ascii lc-roman lc-ltn1 lc-grk
lc-jpold lc-cn lc-jp lc-kr lc-jp2
lc-cns1 lc-cns2) . iso-2022-int-1)
((lc-ascii lc-roman
lc-ltn1 lc-ltn2 lc-crl lc-grk
lc-jpold lc-cn lc-jp lc-kr lc-jp2
lc-cns1 lc-cns2 lc-cns3 lc-cns4
lc-cns5 lc-cns6 lc-cns7) . iso-2022-int-1)
))
dest)
(while alist
(catch 'not-found
(let ((pair (car alist)))
(setq dest
(append dest
(list
(cons (mapcar (function
(lambda (cs)
(if (boundp cs)
(symbol-value cs)
(throw 'not-found nil)
)))
(car pair))
(cdr pair)))))))
(setq alist (cdr alist)))
dest))
(defvar default-mime-charset 'x-ctext
"Default value of MIME-charset.
It is used when MIME-charset is not specified.
It must be symbol.")
(defvar default-mime-charset-for-write
default-mime-charset
"Default value of MIME-charset for encoding.
It is used when suitable MIME-charset is not found.
It must be symbol.")
(defun detect-mime-charset-region (start end)
"Return MIME charset for region between START and END."
(or (charsets-to-mime-charset
(cons lc-ascii (find-charset-region start end)))
default-mime-charset-for-write))
;;; @ end
;;;
(require 'product)
(product-provide (provide 'mcs-om) (require 'apel-ver))
;;; mcs-om.el ends here
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