110 lines
3.4 KiB
EmacsLisp
110 lines
3.4 KiB
EmacsLisp
;;; mcharset.el --- MIME charset API
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;; Copyright (C) 1997,1998,1999,2000 Free Software Foundation, Inc.
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;; Author: MORIOKA Tomohiko <tomo@m17n.org>
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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 'poe)
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(require 'pcustom)
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(cond ((featurep 'mule)
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(if (>= emacs-major-version 20)
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(require 'mcs-20)
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;; for MULE 1.* and 2.*
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(require 'mcs-om)))
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((boundp 'NEMACS)
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;; for Nemacs and Nepoch
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(require 'mcs-nemacs))
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(t
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(require 'mcs-ltn1)))
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(defcustom default-mime-charset-for-write
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(if (mime-charset-p 'utf-8)
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'utf-8
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default-mime-charset)
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"Default value of MIME-charset for encoding.
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It may be used when suitable MIME-charset is not found.
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It must be symbol."
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:group 'i18n
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:type 'mime-charset)
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(defcustom default-mime-charset-detect-method-for-write
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nil
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"Function called when suitable MIME-charset is not found to encode.
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It must be nil or function.
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If it is nil, variable `default-mime-charset-for-write' is used.
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If it is a function, interface must be (TYPE CHARSETS &rest ARGS).
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CHARSETS is list of charset.
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If TYPE is 'region, ARGS has START and END."
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:group 'i18n
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:type '(choice function (const nil)))
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(defun charsets-to-mime-charset (charsets)
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"Return MIME charset from list of charset CHARSETS.
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Return nil if suitable mime-charset is not found."
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(if charsets
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(catch 'tag
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(let ((rest charsets-mime-charset-alist)
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cell)
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(while (setq cell (car rest))
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(if (catch 'not-subset
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(let ((set1 charsets)
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(set2 (car cell))
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obj)
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(while set1
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(setq obj (car set1))
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(or (memq obj set2)
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(throw 'not-subset nil))
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(setq set1 (cdr set1)))
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t))
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(throw 'tag (cdr cell)))
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(setq rest (cdr rest)))
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))))
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(defun find-mime-charset-by-charsets (charsets &optional mode &rest args)
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"Like `charsets-to-mime-charset', but it does not return nil.
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When suitable mime-charset is not found and variable
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`default-mime-charset-detect-method-for-write' is not nil,
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`find-mime-charset-by-charsets' calls the variable as function and
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return the return value of the function.
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Interface of the function is (MODE CHARSETS &rest ARGS).
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When suitable mime-charset is not found and variable
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`default-mime-charset-detect-method-for-write' is nil,
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variable `default-mime-charset-for-write' is returned."
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(or (charsets-to-mime-charset charsets)
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(if default-mime-charset-detect-method-for-write
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(apply default-mime-charset-detect-method-for-write
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mode charsets args)
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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 'mcharset) (require 'apel-ver))
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;;; mcharset.el ends here
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