lisp/case-table.el

   1 ;;; case-table.el ---code to extend the character set and support case tables.
   2
   3 ;; Copyright (C) 1988 Free Software Foundation, Inc.
   4
   5 ;; Author: Howard Gayle
   6 ;; Maintainer: FSF
   7 ;; Keywords: i14n
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 2, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  23 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  24
  25 ;;; Commentary:
  26
  27 ;; Written by:
  28 ;; TN/ETX/TX/UMG Howard Gayle        UUCP : seismo!enea!erix!howard
  29 ;; Telefonaktiebolaget L M Ericsson  Phone: +46 8 719 55 65
  30 ;; Ericsson Telecom                  Telex: 14910 ERIC S
  31 ;; S-126 25 Stockholm                FAX  : +46 8 719 64 82
  32 ;; Sweden
  33
  34 ;;; Code:
  35
  36 (defun describe-buffer-case-table ()
  37   "Describe the case table of the current buffer."
  38   (interactive)
  39   (let ((vector (make-vector 256 nil))
  40         (case-table (current-case-table))
  41         (i 0))
  42     (while (< i 256)
  43       (aset vector i
  44             (cond ((/= ch (downcase ch))
  45                    (concat "uppercase, matches "
  46                            (text-char-description (downcase ch))))
  47                   ((/= ch (upcase ch))
  48                    (concat "lowercase, matches "
  49                            (text-char-description (upcase ch))))
  50                   (t "case-invariant")))
  51       (setq i (1+ i))))
  52   (with-output-to-temp-buffer "*Help*"
  53     (describe-vector vector)))
  54
  55 (defun set-case-syntax-delims (l r string)
  56   "Make characters L and R a matching pair of non-case-converting delimiters.
  57 Sets the entries for L and R in STRING, which is a downcasing table.
  58 Also modifies `standard-syntax-table', and `text-mode-syntax-table' to
  59 indicate left and right delimiters."
  60   (aset string l l)
  61   (aset string r r)
  62   (modify-syntax-entry l (concat "(" (char-to-string r) "  ")
  63                        (standard-syntax-table))
  64   (modify-syntax-entry l (concat "(" (char-to-string r) "  ")
  65                        text-mode-syntax-table)
  66   (modify-syntax-entry r (concat ")" (char-to-string l) "  ")
  67                        (standard-syntax-table))
  68   (modify-syntax-entry r (concat ")" (char-to-string l) "  ")
  69                        text-mode-syntax-table))
  70
  71 (defun set-case-syntax-pair (uc lc string)
  72   "Make characters UC and LC a pair of inter-case-converting letters.
  73 Sets the entries for characters UC and LC in STRING, which is a downcasing table.
  74 Also modify `standard-syntax-table' and `text-mode-syntax-table' to indicate an
  75 (uppercase, lowercase) pair of letters."
  76   (aset string uc lc)
  77   (aset (car (cdr (standard-case-table))) lc uc)
  78   (modify-syntax-entry lc "w   " (standard-syntax-table))
  79   (modify-syntax-entry lc "w   " text-mode-syntax-table)
  80   (modify-syntax-entry uc "w   " (standard-syntax-table))
  81   (modify-syntax-entry uc "w   " text-mode-syntax-table))
  82
  83 (defun set-case-syntax (c syntax string)
  84   "Make characters C case-invariant with syntax SYNTAX.
  85 Sets the entries for character C in STRING, which is the downcasing table.
  86 Also modify `standard-syntax-table' and `text-mode-syntax-table'.
  87 SYNTAX should be \" \", \"w\", \".\" or \"_\"."
  88   (aset string c c)
  89   (modify-syntax-entry c syntax (standard-syntax-table))
  90   (modify-syntax-entry c syntax text-mode-syntax-table))
  91
  92 (provide 'case-table)
  93
  94 ;;; case-table.el ends here