244 lines
7.6 KiB
EmacsLisp
244 lines
7.6 KiB
EmacsLisp
;;; mcs-om.el --- MIME charset implementation for Mule 1.* and Mule 2.*
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;; Copyright (C) 1995,1996,1997,1998 MORIOKA Tomohiko
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;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
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;; Keywords: emulation, compatibility, Mule
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;; This file is part of APEL (A Portable Emacs Library).
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;; This program is free software; you can redistribute it and/or
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;; modify it under the terms of the GNU General Public License as
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;; published by the Free Software Foundation; either version 2, or (at
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;; your option) any later version.
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;; This program is distributed in the hope that it will be useful, but
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;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;; General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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;; Boston, MA 02110-1301, USA.
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;;; Code:
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(require 'poem)
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(defsubst lbt-to-string (lbt)
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(cdr (assq lbt '((nil . nil)
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(CRLF . "\r\n")
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(CR . "\r")
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(dos . "\r\n")
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(mac . "\r"))))
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)
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(defun encode-mime-charset-region (start end charset &optional lbt)
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"Encode the text between START and END as MIME CHARSET."
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(let ((cs (mime-charset-to-coding-system charset lbt)))
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(if cs
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(code-convert start end *internal* cs)
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(if (and lbt (setq cs (mime-charset-to-coding-system charset)))
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(let ((newline (lbt-to-string lbt)))
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(save-excursion
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(save-restriction
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(narrow-to-region start end)
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(code-convert (point-min) (point-max) *internal* cs)
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(if newline
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(goto-char (point-min))
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(while (search-forward "\n" nil t)
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(replace-match newline))))))))))
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(defun decode-mime-charset-region (start end charset &optional lbt)
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"Decode the text between START and END as MIME CHARSET."
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(let ((cs (mime-charset-to-coding-system charset lbt)))
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(if cs
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(code-convert start end cs *internal*)
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(if (and lbt (setq cs (mime-charset-to-coding-system charset)))
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(let ((newline (lbt-to-string lbt)))
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(if newline
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(save-excursion
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(save-restriction
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(narrow-to-region start end)
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(goto-char (point-min))
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(while (search-forward newline nil t)
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(replace-match "\n")))
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(code-convert (point-min) (point-max) cs *internal*))
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(code-convert start end cs *internal*)))))))
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(defun encode-mime-charset-string (string charset &optional lbt)
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"Encode the STRING as MIME CHARSET."
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(let ((cs (mime-charset-to-coding-system charset lbt)))
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(if cs
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(code-convert-string string *internal* cs)
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(if (and lbt (setq cs (mime-charset-to-coding-system charset)))
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(let ((newline (lbt-to-string lbt)))
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(if newline
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(with-temp-buffer
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(insert string)
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(code-convert (point-min) (point-max) *internal* cs)
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(goto-char (point-min))
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(while (search-forward "\n" nil t)
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(replace-match newline))
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(buffer-string))
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(decode-coding-string string cs)))
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string))))
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(defun decode-mime-charset-string (string charset &optional lbt)
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"Decode the STRING which is encoded in MIME CHARSET."
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(let ((cs (mime-charset-to-coding-system charset lbt)))
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(if cs
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(decode-coding-string string cs)
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(if (and lbt (setq cs (mime-charset-to-coding-system charset)))
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(let ((newline (lbt-to-string lbt)))
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(if newline
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(with-temp-buffer
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(insert string)
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(goto-char (point-min))
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(while (search-forward newline nil t)
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(replace-match "\n"))
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(code-convert (point-min) (point-max) cs *internal*)
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(buffer-string))
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(decode-coding-string string cs)))
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string))))
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(cond
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((and (>= emacs-major-version 19) (>= emacs-minor-version 29))
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;; for MULE 2.3 based on Emacs 19.34.
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(defun write-region-as-mime-charset (charset start end filename
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&optional append visit lockname)
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"Like `write-region', q.v., but code-convert by MIME CHARSET."
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(let ((file-coding-system
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(or (mime-charset-to-coding-system charset)
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*noconv*)))
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(write-region start end filename append visit lockname)))
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)
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(t
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;; for MULE 2.3 based on Emacs 19.28.
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(defun write-region-as-mime-charset (charset start end filename
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&optional append visit lockname)
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"Like `write-region', q.v., but code-convert by MIME CHARSET."
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(let ((file-coding-system
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(or (mime-charset-to-coding-system charset)
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*noconv*)))
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(write-region start end filename append visit)))
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))
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;;; @ to coding-system
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;;;
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(condition-case nil
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(require 'cyrillic)
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(error nil))
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(defvar mime-charset-coding-system-alist
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'((iso-8859-1 . *ctext*)
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(x-ctext . *ctext*)
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(gb2312 . *euc-china*)
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(koi8-r . *koi8*)
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(iso-2022-jp-2 . *iso-2022-ss2-7*)
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(x-iso-2022-jp-2 . *iso-2022-ss2-7*)
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(shift_jis . *sjis*)
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(x-shiftjis . *sjis*)
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))
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(defsubst mime-charset-to-coding-system (charset &optional lbt)
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"Return coding-system corresponding with CHARSET.
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CHARSET is a symbol whose name is MIME charset.
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If optional argument LBT (`CRLF', `LF', `CR', `unix', `dos' or `mac')
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is specified, it is used as line break code type of coding-system."
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(if (stringp charset)
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(setq charset (intern (downcase charset)))
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)
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(setq charset (or (cdr (assq charset mime-charset-coding-system-alist))
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(intern (concat "*" (symbol-name charset) "*"))))
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(if lbt
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(setq charset (intern (format "%s%s" charset
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(cond ((eq lbt 'CRLF) 'dos)
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((eq lbt 'LF) 'unix)
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((eq lbt 'CR) 'mac)
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(t lbt)))))
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)
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(if (coding-system-p charset)
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charset
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))
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;;; @ detection
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;;;
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(defvar charsets-mime-charset-alist
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(let ((alist
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'(((lc-ascii) . us-ascii)
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((lc-ascii lc-ltn1) . iso-8859-1)
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((lc-ascii lc-ltn2) . iso-8859-2)
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((lc-ascii lc-ltn3) . iso-8859-3)
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((lc-ascii lc-ltn4) . iso-8859-4)
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;;; ((lc-ascii lc-crl) . iso-8859-5)
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((lc-ascii lc-crl) . koi8-r)
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((lc-ascii lc-arb) . iso-8859-6)
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((lc-ascii lc-grk) . iso-8859-7)
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((lc-ascii lc-hbw) . iso-8859-8)
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((lc-ascii lc-ltn5) . iso-8859-9)
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((lc-ascii lc-roman lc-jpold lc-jp) . iso-2022-jp)
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((lc-ascii lc-kr) . euc-kr)
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((lc-ascii lc-cn) . gb2312)
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((lc-ascii lc-big5-1 lc-big5-2) . big5)
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((lc-ascii lc-roman lc-ltn1 lc-grk
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lc-jpold lc-cn lc-jp lc-kr
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lc-jp2) . iso-2022-jp-2)
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((lc-ascii lc-roman lc-ltn1 lc-grk
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lc-jpold lc-cn lc-jp lc-kr lc-jp2
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lc-cns1 lc-cns2) . iso-2022-int-1)
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((lc-ascii lc-roman
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lc-ltn1 lc-ltn2 lc-crl lc-grk
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lc-jpold lc-cn lc-jp lc-kr lc-jp2
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lc-cns1 lc-cns2 lc-cns3 lc-cns4
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lc-cns5 lc-cns6 lc-cns7) . iso-2022-int-1)
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))
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dest)
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(while alist
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(catch 'not-found
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(let ((pair (car alist)))
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(setq dest
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(append dest
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(list
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(cons (mapcar (function
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(lambda (cs)
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(if (boundp cs)
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(symbol-value cs)
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(throw 'not-found nil)
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)))
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(car pair))
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(cdr pair)))))))
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(setq alist (cdr alist)))
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dest))
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(defvar default-mime-charset 'x-ctext
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"Default value of MIME-charset.
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It is used when MIME-charset is not specified.
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It must be symbol.")
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(defvar default-mime-charset-for-write
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default-mime-charset
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"Default value of MIME-charset for encoding.
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It is used when suitable MIME-charset is not found.
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It must be symbol.")
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(defun detect-mime-charset-region (start end)
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"Return MIME charset for region between START and END."
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(or (charsets-to-mime-charset
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(cons lc-ascii (find-charset-region start end)))
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default-mime-charset-for-write))
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;;; @ end
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;;;
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(require 'product)
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(product-provide (provide 'mcs-om) (require 'apel-ver))
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;;; mcs-om.el ends here
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