Added Riece pkg subtree

[packages] / xemacs-packages / riece / lisp / riece-coding.el

diff --git a/xemacs-packages/riece/lisp/riece-coding.el b/xemacs-packages/riece/lisp/riece-coding.el
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+;;; riece-coding.el --- converting string with coding system -*- lexical-binding: t -*-
+;; Copyright (C) 1998-2003 Daiki Ueno
+
+;; Author: Daiki Ueno <ueno@unixuser.org>
+;; Created: 1998-09-28
+;; Keywords: IRC, riece, coding-system, MULE
+
+;; This file is part of Riece.
+
+;; 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:
+
+(require 'riece-globals)
+(require 'riece-options)
+
+(defun riece-encode-coding-string (string)
+  (if (and (local-variable-p 'riece-coding-system (current-buffer))
+          riece-coding-system)         ;should be nil on non-Mule environment
+      (encode-coding-string string (if (consp riece-coding-system)
+                                      (cdr riece-coding-system)
+                                    riece-coding-system))
+    string))
+
+(defun riece-decode-coding-string (string)
+  (if (and (local-variable-p 'riece-coding-system (current-buffer))
+          riece-coding-system)         ;should be nil on non-Mule environment
+      (riece-decode-coding-string-1 string
+                                   (if (consp riece-coding-system)
+                                       (car riece-coding-system)
+                                     riece-coding-system))
+    string))
+
+(defun riece-decode-coding-string-1 (string coding-system)
+  (let* ((decoded (decode-coding-string string coding-system))
+        (length (length decoded)))
+    (put-text-property 0 length 'riece-decoded-encoded-string
+                      string decoded)
+    (put-text-property 0 length 'riece-decoded-coding-system
+                      coding-system decoded)
+    decoded))
+
+;; The following functions are API used by handler functions.  For the
+;; meantime DECODED is actually a string (with some text properties).
+;; In the future, however, the implementation _should_ be changed so
+;; that decoding phase is delayed until the body of handler functions.
+(defun riece-decoded-coding-system (decoded)
+  "Return the coding-system used for decoding DECODED."
+  (get-text-property 0 'riece-decoded-coding-system decoded))
+
+(defun riece-decoded-encoded-string (decoded)
+  "Return the string before decoding."
+  (get-text-property 0 'riece-decoded-encoded-string decoded))
+
+(defalias 'riece-decoded-string 'identity)
+
+(provide 'riece-coding)
+
+;;; riece-coding.el ends here