Separate invisible features from poe to invisible.

[elisp/apel.git] / inv-19.el

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+;;; inv-19.el --- invisible feature implementation for Emacs 19 or later
+
+;; Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc.
+
+;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
+;; Keywords: invisible, text-property, region, Emacs 19
+
+;; 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:
+
+(defmacro enable-invisible ())
+
+(defmacro end-of-invisible ())
+
+(defun invisible-region (start end)
+  (if (save-excursion
+       (goto-char (1- end))
+       (eq (following-char) ?\n)
+       )
+      (setq end (1- end))
+    )
+  (put-text-property start end 'invisible t)
+  )
+
+(defun visible-region (start end)
+  (put-text-property start end 'invisible nil)
+  )
+
+(defun invisible-p (pos)
+  (get-text-property pos 'invisible)
+  )
+
+(defun next-visible-point (pos)
+  (save-excursion
+    (goto-char (next-single-property-change pos 'invisible))
+    (if (eq (following-char) ?\n)
+       (forward-char)
+      )
+    (point)))
+
+
+;;; @ end
+;;;
+
+(provide 'inv-19)
+
+;;; inv-19.el ends here