lisp/case-table.el

   1 ;;; case-table.el --- code to extend the character set and support case tables.
   2
   3 ;; Copyright (C) 1988, 1994 Free Software Foundation, Inc.
   4
   5 ;; Author: Howard Gayle
   6 ;; Maintainer: FSF
   7 ;; Keywords: i18n
   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 ;;;###autoload
  37 (defun describe-buffer-case-table ()
  38   "Describe the case table of the current buffer."
  39   (interactive)
  40   (let ((vector (make-vector 256 nil))
  41         (ch 0))
  42     (while (< ch 256)
  43       (aset vector ch
  44             (cond ((/= ch (downcase ch))
  45                    (concat "uppercase, matches "
  46                            (char-to-string (downcase ch))))
  47                   ((/= ch (upcase ch))
  48                    (concat "lowercase, matches "
  49                            (char-to-string (upcase ch))))
  50                   (t "case-invariant")))
  51       (setq ch (1+ ch)))
  52     (save-excursion
  53      (with-output-to-temp-buffer "*Help*"
  54        (set-buffer standard-output)
  55        (describe-vector vector)
  56        (help-mode)))))
  57
  58 ;;;###autoload
  59 (defun set-case-syntax-delims (l r table)
  60   "Make characters L and R a matching pair of non-case-converting delimiters.
  61 This sets the entries for L and R in TABLE, which is a string
  62 that will be used as the downcase part of a case table.
  63 It also modifies `standard-syntax-table' to
  64 indicate left and right delimiters."
  65   (aset table l l)
  66   (aset table r r)
  67   (modify-syntax-entry l (concat "(" (char-to-string r) "  ")
  68                        (standard-syntax-table))
  69   (modify-syntax-entry r (concat ")" (char-to-string l) "  ")
  70                        (standard-syntax-table)))
  71
  72 ;;;###autoload
  73 (defun set-case-syntax-pair (uc lc table)
  74   "Make characters UC and LC a pair of inter-case-converting letters.
  75 This sets the entries for characters UC and LC in TABLE, which is a string
  76 that will be used as the downcase part of a case table.
  77 It also modifies `standard-syntax-table' to give them the syntax of
  78 word constituents."
  79   (aset table uc lc)
  80   (aset table lc lc)
  81   (modify-syntax-entry lc "w   " (standard-syntax-table))
  82   (modify-syntax-entry uc "w   " (standard-syntax-table)))
  83
  84 ;;;###autoload
  85 (defun set-case-syntax (c syntax table)
  86   "Make characters C case-invariant with syntax SYNTAX.
  87 This sets the entries for character C in TABLE, which is a string
  88 that will be used as the downcase part of a case table.
  89 It also modifies `standard-syntax-table'.
  90 SYNTAX should be \" \", \"w\", \".\" or \"_\"."
  91   (aset table c c)
  92   (modify-syntax-entry c syntax (standard-syntax-table)))
  93
  94 (provide 'case-table)
  95
  96 ;;; case-table.el ends here