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+;; Functions for extending the character set and dealing with case tables.
+;; Copyright (C) 1988 Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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 1, or (at your option)
+;; any later version.
+
+;; GNU Emacs 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, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+
+;; Written by:
+;; TN/ETX/TX/UMG Howard Gayle        UUCP : seismo!enea!erix!howard
+;; Telefonaktiebolaget L M Ericsson  Phone: +46 8 719 55 65
+;; Ericsson Telecom     	     Telex: 14910 ERIC S
+;; S-126 25 Stockholm                FAX  : +46 8 719 64 82
+;; Sweden
+
+(defun describe-buffer-case-table ()
+  "Describe the case table of the current buffer."
+  (interactive)
+  (let ((vector (make-vector 256 nil))
+	(case-table (current-case-table))
+	(i 0))
+    (while (< i 256)
+      (aset vector i 
+	    (cond ((/= ch (downcase ch))
+		   (concat "uppercase, matches "
+			   (text-char-description (downcase ch))))
+		  ((/= ch (upcase ch))
+		   (concat "lowercase, matches "
+			   (text-char-description (upcase ch))))
+		  (t "case-invariant")))
+      (setq i (1+ i))))
+  (with-output-to-temp-buffer "*Help*"
+    (describe-vector vector)))
+
+(defun invert-case (count)
+  "Change the case of the character just after point and move over it.
+With arg, applies to that many chars.
+Negative arg inverts characters before point but does not move."
+  (interactive "p")
+  (if (< count 0)
+      (progn (setq count (min (1- (point)) (- count)))
+	     (forward-char (- count))))
+  (while (> count 0)
+    (let ((oc (following-char)))		; Old character.
+      (cond ((/= (upcase ch) ch)
+	     (replace-char (upcase ch)))
+	    ((/= (downcase ch) ch)
+	     (replace-char (downcase ch)))))
+    (forward-char 1)
+    (setq count (1- count))))
+
+(defun set-case-syntax-delims (l r table)
+  "Make characters L and R a matching pair of non-case-converting delimiters.
+Sets the entries for L and R in standard-case-table,
+standard-syntax-table, and text-mode-syntax-table to indicate
+left and right delimiters."
+  (aset (car table) l l)
+  (aset (car table) r r)
+  (modify-syntax-entry l (concat "(" (char-to-string r) "  ")
+		       (standard-syntax-table))
+  (modify-syntax-entry l (concat "(" (char-to-string r) "  ")
+		       text-mode-syntax-table)
+  (modify-syntax-entry r (concat ")" (char-to-string l) "  ")
+		       (standard-syntax-table))
+  (modify-syntax-entry r (concat ")" (char-to-string l) "  ")
+		       text-mode-syntax-table))
+
+(defun set-case-syntax-pair (uc lc table)
+  "Make characters UC and LC a pair of inter-case-converting letters.
+Sets the entries for characters UC and LC in
+standard-case-table, standard-syntax-table, and
+text-mode-syntax-table to indicate an (uppercase, lowercase)
+pair of letters."
+  (aset (car table) uc lc)
+  (modify-syntax-entry lc "w   " (standard-syntax-table))
+  (modify-syntax-entry lc "w   " text-mode-syntax-table)
+  (modify-syntax-entry uc "w   " (standard-syntax-table))
+  (modify-syntax-entry uc "w   " text-mode-syntax-table))
+
+(defun set-case-syntax (c syntax table)
+  "Make characters C case-invariant with syntax SYNTAX.
+Sets the entries for character C in standard-case-table,
+standard-syntax-table, and text-mode-syntax-table to indicate this.
+SYNTAX should be \" \", \"w\", \".\" or \"_\"."
+  (aset (car table) c c)
+  (modify-syntax-entry c syntax (standard-syntax-table))
+  (modify-syntax-entry c syntax text-mode-syntax-table))
+
+(provide 'case-table)