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[elisp/lemi.git] / poe / poem.el

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+;;; poem.el --- Emulate latest MULE features; -*-byte-compile-dynamic: t;-*-
+
+;; Copyright (C) 1998,1999 Free Software Foundation, Inc.
+
+;; 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 'pces)
+
+(cond ((featurep 'mule)
+       (cond ((featurep 'xemacs)
+             (require 'poem-xm)
+             )
+            ((>= emacs-major-version 20)
+             (require 'poem-e20)
+             )
+            (t
+             ;; for MULE 1.* and 2.*
+             (require 'poem-om)
+             ))
+       )
+      ((boundp 'NEMACS)
+       ;; for Nemacs and Nepoch
+       (require 'poem-nemacs)
+       )
+      (t
+       (require 'poem-ltn1)
+       ))
+
+
+;;; @ Emacs 20.3 emulation
+;;;
+
+(defsubst-maybe string-as-unibyte (string)
+  "Return a unibyte string with the same individual bytes as STRING.
+If STRING is unibyte, the result is STRING itself.
+\[Emacs 20.3 emulating macro]"
+  string)
+
+(defsubst-maybe string-as-multibyte (string)
+  "Return a multibyte string with the same individual bytes as STRING.
+If STRING is multibyte, the result is STRING itself.
+\[Emacs 20.3 emulating macro]"
+  string)
+
+(defun-maybe charset-after (&optional pos)
+  "Return charset of a character in current buffer at position POS.
+If POS is nil, it defauls to the current point.
+If POS is out of range, the value is nil.
+\[Emacs 20.3 emulating function]"
+  (char-charset (char-after pos))
+  )
+
+;;; @ XEmacs-mule emulation
+;;;
+
+(defalias-maybe 'char-int 'identity)
+
+(defalias-maybe 'int-char 'identity)
+
+(defalias-maybe 'characterp 'integerp)
+
+(defalias-maybe 'char-or-char-int-p 'integerp)
+
+(defun-maybe char-octet (ch &optional n)
+  "Return the octet numbered N (should be 0 or 1) of char CH.
+N defaults to 0 if omitted. [XEmacs-mule emulating function]"
+  (or (nth (if n
+              (1+ n)
+            1)
+          (split-char ch))
+      0))
+
+
+;;; @ end
+;;;
+
+(require 'product)
+(product-provide (provide 'poem) (require 'apel-ver))
+
+;;; poem.el ends here