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;;; mcharset.el --- MIME charset API -*- lexical-binding: t -*-
;; Copyright (C) 1997,1998,1999,2000 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., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Code:
(defcustom default-mime-charset-for-write
'utf-8
"Default value of MIME-charset for encoding.
It may be used when suitable MIME-charset is not found.
It must be symbol."
:group 'i18n
:type 'mime-charset)
(defcustom default-mime-charset-detect-method-for-write
nil
"Function called when suitable MIME-charset is not found to encode.
It must be nil or function.
If it is nil, variable `default-mime-charset-for-write' is used.
If it is a function, interface must be (TYPE CHARSETS &rest ARGS).
CHARSETS is list of charset.
If TYPE is \\='region, ARGS has START and END."
:group 'i18n
:type '(choice function (const nil)))
(provide 'mcharset)
(require 'mcs-20)
(defun charsets-to-mime-charset (charsets)
"Return MIME charset from list of charset CHARSETS.
Return nil if suitable mime-charset is not found."
(if charsets
(catch 'tag
(let ((rest charsets-mime-charset-alist)
cell)
(while (setq cell (car rest))
(if (catch 'not-subset
(let ((set1 charsets)
(set2 (car cell))
obj)
(while set1
(setq obj (car set1))
(or (memq obj set2)
(throw 'not-subset nil))
(setq set1 (cdr set1)))
t))
(throw 'tag (cdr cell)))
(setq rest (cdr rest)))
))))
(defun find-mime-charset-by-charsets (charsets &optional mode &rest args)
"Like `charsets-to-mime-charset', but it does not return nil.
When suitable mime-charset is not found and variable
`default-mime-charset-detect-method-for-write' is not nil,
`find-mime-charset-by-charsets' calls the variable as function and
return the return value of the function.
Interface of the function is (MODE CHARSETS &rest ARGS).
When suitable mime-charset is not found and variable
`default-mime-charset-detect-method-for-write' is nil,
variable `default-mime-charset-for-write' is returned."
(or (charsets-to-mime-charset charsets)
(if default-mime-charset-detect-method-for-write
(apply default-mime-charset-detect-method-for-write
mode charsets args)
default-mime-charset-for-write)))
;;; @ end
;;;
(require 'product)
(product-provide (provide 'mcharset) (require 'apel-ver))
;;; mcharset.el ends here
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