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 ((description (make-char-table 'case-table)))
  41     (map-char-table
  42      (function (lambda (key value)
  43                  (set-char-table-range
  44                   description key
  45                   (cond ((null key)
  46                          "case-invariant")
  47                         ((/= key (downcase key))
  48                          (concat "uppercase, matches "
  49                                  (char-to-string (downcase key))))
  50                         ((/= key (upcase key))
  51                          (concat "lowercase, matches "
  52                                  (char-to-string (upcase key))))
  53                         (t "case-invariant")))))
  54      (current-case-table))
  55     (save-excursion
  56      (with-output-to-temp-buffer "*Help*"
  57        (set-buffer standard-output)
  58        (describe-vector description)
  59        (help-mode)))))
  60
  61 ;;;###autoload
  62 (defun copy-case-table (case-table)
  63   (let ((copy (copy-sequence case-table)))
  64     ;; Clear out the extra slots so that they will be
  65     ;; recomputed from the main (downcase) table.
  66     (set-char-table-extra-slot copy 0 nil)
  67     (set-char-table-extra-slot copy 1 nil)
  68     (set-char-table-extra-slot copy 2 nil)
  69     copy))
  70
  71 ;;;###autoload
  72 (defun set-case-syntax-delims (l r table)
  73   "Make characters L and R a matching pair of non-case-converting delimiters.
  74 This sets the entries for L and R in TABLE, which is a string
  75 that will be used as the downcase part of a case table.
  76 It also modifies `standard-syntax-table' to
  77 indicate left and right delimiters."
  78   (aset table l l)
  79   (aset table r r)
  80   ;; Clear out the extra slots so that they will be
  81   ;; recomputed from the main (downcase) table.
  82   (set-char-table-extra-slot table 0 nil)
  83   (set-char-table-extra-slot table 1 nil)
  84   (set-char-table-extra-slot table 2 nil)
  85   (modify-syntax-entry l (concat "(" (char-to-string r) "  ")
  86                        (standard-syntax-table))
  87   (modify-syntax-entry r (concat ")" (char-to-string l) "  ")
  88                        (standard-syntax-table)))
  89
  90 ;;;###autoload
  91 (defun set-case-syntax-pair (uc lc table)
  92   "Make characters UC and LC a pair of inter-case-converting letters.
  93 This sets the entries for characters UC and LC in TABLE, which is a string
  94 that will be used as the downcase part of a case table.
  95 It also modifies `standard-syntax-table' to give them the syntax of
  96 word constituents."
  97   (aset table uc lc)
  98   (aset table lc lc)
  99   (set-char-table-extra-slot table 0 nil)
 100   (set-char-table-extra-slot table 1 nil)
 101   (set-char-table-extra-slot table 2 nil)
 102   (modify-syntax-entry lc "w   " (standard-syntax-table))
 103   (modify-syntax-entry uc "w   " (standard-syntax-table)))
 104
 105 ;;;###autoload
 106 (defun set-case-syntax (c syntax table)
 107   "Make characters C case-invariant with syntax SYNTAX.
 108 This sets the entries for character C in TABLE, which is a string
 109 that will be used as the downcase part of a case table.
 110 It also modifies `standard-syntax-table'.
 111 SYNTAX should be \" \", \"w\", \".\" or \"_\"."
 112   (aset table c c)
 113   (set-char-table-extra-slot table 0 nil)
 114   (set-char-table-extra-slot table 1 nil)
 115   (set-char-table-extra-slot table 2 nil)
 116   (modify-syntax-entry c syntax (standard-syntax-table)))
 117
 118 (provide 'case-table)
 119
 120 ;;; case-table.el ends here