lisp/case-table.el

   1 ;;; case-table.el --- functions for extending the character set and dealing with case tables.
   2
   3 ;; Copyright (C) 1988 Free Software Foundation, Inc.
   4
   5 ;; This file is part of GNU Emacs.
   6
   7 ;; GNU Emacs is free software; you can redistribute it and/or modify
   8 ;; it under the terms of the GNU General Public License as published by
   9 ;; the Free Software Foundation; either version 1, or (at your option)
  10 ;; any later version.
  11
  12 ;; GNU Emacs is distributed in the hope that it will be useful,
  13 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 ;; GNU General Public License for more details.
  16
  17 ;; You should have received a copy of the GNU General Public License
  18 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  19 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  20
  21
  22 ;; Written by:
  23 ;; TN/ETX/TX/UMG Howard Gayle        UUCP : seismo!enea!erix!howard
  24 ;; Telefonaktiebolaget L M Ericsson  Phone: +46 8 719 55 65
  25 ;; Ericsson Telecom                  Telex: 14910 ERIC S
  26 ;; S-126 25 Stockholm                FAX  : +46 8 719 64 82
  27 ;; Sweden
  28
  29 (defun describe-buffer-case-table ()
  30   "Describe the case table of the current buffer."
  31   (interactive)
  32   (let ((vector (make-vector 256 nil))
  33         (case-table (current-case-table))
  34         (i 0))
  35     (while (< i 256)
  36       (aset vector i
  37             (cond ((/= ch (downcase ch))
  38                    (concat "uppercase, matches "
  39                            (text-char-description (downcase ch))))
  40                   ((/= ch (upcase ch))
  41                    (concat "lowercase, matches "
  42                            (text-char-description (upcase ch))))
  43                   (t "case-invariant")))
  44       (setq i (1+ i))))
  45   (with-output-to-temp-buffer "*Help*"
  46     (describe-vector vector)))
  47
  48 (defun invert-case (count)
  49   "Change the case of the character just after point and move over it.
  50 With prefix arg, applies to that many chars.
  51 Negative arg inverts characters before point but does not move."
  52   (interactive "p")
  53   (if (< count 0)
  54       (progn (setq count (min (1- (point)) (- count)))
  55              (forward-char (- count))))
  56   (while (> count 0)
  57     (let ((oc (following-char)))                ; Old character.
  58       (cond ((/= (upcase ch) ch)
  59              (replace-char (upcase ch)))
  60             ((/= (downcase ch) ch)
  61              (replace-char (downcase ch)))))
  62     (forward-char 1)
  63     (setq count (1- count))))
  64
  65 (defun set-case-syntax-delims (l r table)
  66   "Make characters L and R a matching pair of non-case-converting delimiters.
  67 Sets the entries for L and R in `standard-case-table', `standard-syntax-table',
  68 and `text-mode-syntax-table' to indicate left and right delimiters."
  69   (aset (car table) l l)
  70   (aset (car table) r r)
  71   (modify-syntax-entry l (concat "(" (char-to-string r) "  ")
  72                        (standard-syntax-table))
  73   (modify-syntax-entry l (concat "(" (char-to-string r) "  ")
  74                        text-mode-syntax-table)
  75   (modify-syntax-entry r (concat ")" (char-to-string l) "  ")
  76                        (standard-syntax-table))
  77   (modify-syntax-entry r (concat ")" (char-to-string l) "  ")
  78                        text-mode-syntax-table))
  79
  80 (defun set-case-syntax-pair (uc lc table)
  81   "Make characters UC and LC a pair of inter-case-converting letters.
  82 Sets the entries for characters UC and LC in `standard-case-table',
  83 `standard-syntax-table' and `text-mode-syntax-table' to indicate an
  84 (uppercase, lowercase) pair of letters."
  85
  86   (aset (car table) uc lc)
  87   (modify-syntax-entry lc "w   " (standard-syntax-table))
  88   (modify-syntax-entry lc "w   " text-mode-syntax-table)
  89   (modify-syntax-entry uc "w   " (standard-syntax-table))
  90   (modify-syntax-entry uc "w   " text-mode-syntax-table))
  91
  92 (defun set-case-syntax (c syntax table)
  93   "Make characters C case-invariant with syntax SYNTAX.
  94 Sets the entries for character C in `standard-case-table',
  95 `standard-syntax-table' and `text-mode-syntax-table' to indicate this.
  96 SYNTAX should be \" \", \"w\", \".\" or \"_\"."
  97   (aset (car table) c c)
  98   (modify-syntax-entry c syntax (standard-syntax-table))
  99   (modify-syntax-entry c syntax text-mode-syntax-table))
 100
 101 (provide 'case-table)
 102
 103 ;;; case-table.el ends here