source: projects/emacsen-common/trunk/apel-sample/usr/share/emacs/site-lisp/apel/mcs-nemacs.el @ 7238

;;; mcs-nemacs.el --- MIME charset implementation for Nemacs

;; Copyright (C) 1995,1996,1997,1998,2000 Free Software Foundation, Inc.

;; Author: MORIOKA Tomohiko <tomo@m17n.org>
;; 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:

(defvar charsets-mime-charset-alist
  '(((ascii) . us-ascii)))

(defvar default-mime-charset 'iso-2022-jp)

(defvar mime-charset-coding-system-alist
  '((iso-2022-jp     . 2)
    (shift_jis       . 1)
    ))

(defsubst lbt-to-string (lbt)
  (cdr (assq lbt '((nil . nil)
                   (CRLF . "\r\n")
                   (CR . "\r")
                   (dos . "\r\n")
                   (mac . "\r"))))
  )

(defun mime-charset-to-coding-system (charset)
  (if (stringp charset)
      (setq charset (intern (downcase charset)))
    )
  (cdr (assq charset mime-charset-coding-system-alist)))

(fset 'mime-charset-p 'mime-charset-to-coding-system)

(defun detect-mime-charset-region (start end)
  "Return MIME charset for region between START and END.
\[emu-nemacs.el]"
  (if (save-excursion
        (save-restriction
          (narrow-to-region start end)
          (goto-char start)
          (re-search-forward "[\200-\377]" nil t)))
      default-mime-charset
    'us-ascii))

(defun encode-mime-charset-region (start end charset &optional lbt)
  "Encode the text between START and END as MIME CHARSET.
\[emu-nemacs.el]"
  (let ((cs (mime-charset-to-coding-system charset))
        (nl (lbt-to-string lbt)))
    (and (numberp cs)
         (or (= cs 3)
             (save-excursion
               (save-restriction
                 (narrow-to-region start end)
                 (convert-region-kanji-code start end 3 cs)
                 (if nl
                     (progn
                       (goto-char (point-min))
                       (while (search-forward "\n" nil t)
                         (replace-match nl)))
                   )))
             ))))

(defun decode-mime-charset-region (start end charset &optional lbt)
  "Decode the text between START and END as MIME CHARSET.
\[emu-nemacs.el]"
  (let ((cs (mime-charset-to-coding-system charset))
        (nl (lbt-to-string lbt)))
    (and (numberp cs)
         (or (= cs 3)
             (save-excursion
               (save-restriction
                 (narrow-to-region start end)
                 (convert-region-kanji-code start end cs 3)
                 (if nl
                     (progn
                       (goto-char (point-min))
                       (while (search-forward nl nil t)
                         (replace-match "\n")))
                   )))
             ))))

(defun encode-mime-charset-string (string charset &optional lbt)
  "Encode the STRING as MIME CHARSET. [emu-nemacs.el]"
  (with-temp-buffer
    (insert string)
    (encode-mime-charset-region (point-min)(point-max) charset lbt)
    (buffer-string)))

(defun decode-mime-charset-string (string charset &optional lbt)
  "Decode the STRING as MIME CHARSET. [emu-nemacs.el]"
  (with-temp-buffer
    (insert string)
    (decode-mime-charset-region (point-min)(point-max) charset lbt)
    (buffer-string)))

(defun write-region-as-mime-charset (charset start end filename)
  "Like `write-region', q.v., but code-convert by MIME CHARSET.
\[emu-nemacs.el]"
  (let ((kanji-fileio-code
         (or (mime-charset-to-coding-system charset) 0)))
    (write-region start end filename)))


;;; @ end
;;;

(require 'product)
(product-provide (provide 'mcs-nemacs) (require 'apel-ver))

;;; mcs-nemacs.el ends here