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1 ;;; case-table.el --- code to extend the character set and support case tables.
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2 ;; Keywords: i18n
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3
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4 ;; Copyright (C) 1988, 1993 Free Software Foundation, Inc.
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5
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6 ;; This file is part of XEmacs.
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7
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8 ;; XEmacs is free software; you can redistribute it and/or modify it
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9 ;; under the terms of the GNU General Public License as published by
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10 ;; the Free Software Foundation; either version 2, or (at your option)
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11 ;; any later version.
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12
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13 ;; XEmacs is distributed in the hope that it will be useful, but
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14 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 ;; General Public License for more details.
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17
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18 ;; You should have received a copy of the GNU General Public License
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19 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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20 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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21
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22 ;;; Synched up with: Not synched with FSF.
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23
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24 ;; Written by:
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25 ;; TN/ETX/TX/UMG Howard Gayle UUCP : seismo!enea!erix!howard
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26 ;; Telefonaktiebolaget L M Ericsson Phone: +46 8 719 55 65
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27 ;; Ericsson Telecom Telex: 14910 ERIC S
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28 ;; S-126 25 Stockholm FAX : +46 8 719 64 82
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29 ;; Sweden
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30
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31 ;;;###autoload
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32 (defun describe-buffer-case-table ()
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33 "Describe the case table of the current buffer."
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34 (interactive)
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35 (let ((vector (make-vector 256 nil))
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36 (case-table (current-case-table))
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37 (ch 0))
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38 (with-displaying-help-buffer
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39 (set-buffer standard-output)
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40 (while (< ch 256)
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41 (cond ((/= ch (downcase ch))
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42 (insert (text-char-description ch))
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43 (indent-to 16)
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44 (insert "uppercase, matches "
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45 (text-char-description (downcase ch))
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46 "\n"))
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47 ((/= ch (upcase ch))
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48 (insert (text-char-description ch))
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49 (indent-to 16)
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50 (insert "lowercase, matches "
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51 (text-char-description (upcase ch))
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52 "\n"))
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53 ;; (t
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54 ;; (insert (text-char-description ch))
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55 ;; (indent-to 16)
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56 ;; (insert "case-invariant\n"))
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57 )
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58 (setq ch (1+ ch))))))
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59
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60 (defun invert-case (count)
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61 "Change the case of the character just after point and move over it.
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62 With arg, applies to that many chars.
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63 Negative arg inverts characters before point but does not move."
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64 (interactive "p")
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65 (if (< count 0)
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66 (progn (setq count (min (1- (point)) (- count)))
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67 (forward-char (- count))))
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68 (while (> count 0)
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69 (let ((ch (following-char)))
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70 (cond ((/= (upcase ch) ch)
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71 (insert (upcase ch))
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72 (delete-char 1))
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73 ((/= (downcase ch) ch)
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74 (insert (downcase ch))
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75 (delete-char 1))
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76 (t
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77 (forward-char 1))))
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78 (setq count (1- count))))
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79
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80 (defun set-case-syntax-delims (l r table)
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81 "Make characters L and R a matching pair of non-case-converting delimiters.
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82 Sets the entries for L and R in standard-case-table,
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83 standard-syntax-table, and text-mode-syntax-table to indicate
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84 left and right delimiters."
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85 (aset (car table) l l)
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86 (aset (car table) r r)
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87 (modify-syntax-entry l (concat "(" (char-to-string r) " ")
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88 (standard-syntax-table))
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89 (modify-syntax-entry l (concat "(" (char-to-string r) " ")
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90 text-mode-syntax-table)
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91 (modify-syntax-entry r (concat ")" (char-to-string l) " ")
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92 (standard-syntax-table))
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93 (modify-syntax-entry r (concat ")" (char-to-string l) " ")
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94 text-mode-syntax-table))
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95
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96 (defun set-case-syntax-pair (uc lc table)
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97 "Make characters UC and LC a pair of inter-case-converting letters.
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98 Sets the entries for characters UC and LC in
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99 standard-case-table, standard-syntax-table, and
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100 text-mode-syntax-table to indicate an (uppercase, lowercase)
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101 pair of letters."
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102 (aset (car table) uc lc)
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103 (modify-syntax-entry lc "w " (standard-syntax-table))
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104 (modify-syntax-entry lc "w " text-mode-syntax-table)
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105 (modify-syntax-entry uc "w " (standard-syntax-table))
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106 (modify-syntax-entry uc "w " text-mode-syntax-table))
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107
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108 (defun set-case-syntax (c syntax table)
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109 "Make characters C case-invariant with syntax SYNTAX.
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110 Sets the entries for character C in standard-case-table,
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111 standard-syntax-table, and text-mode-syntax-table to indicate this.
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112 SYNTAX should be \" \", \"w\", \".\" or \"_\"."
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113 (aset (car table) c c)
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114 (modify-syntax-entry c syntax (standard-syntax-table))
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115 (modify-syntax-entry c syntax text-mode-syntax-table))
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116
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117 (provide 'case-table)
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