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 the
  23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  24 ;; Boston, MA 02111-1307, USA.
  25
  26 ;;; Commentary:
  27
  28 ;; Written by:
  29 ;; TN/ETX/TX/UMG Howard Gayle        UUCP : seismo!enea!erix!howard
  30 ;; Telefonaktiebolaget L M Ericsson  Phone: +46 8 719 55 65
  31 ;; Ericsson Telecom                  Telex: 14910 ERIC S
  32 ;; S-126 25 Stockholm                FAX  : +46 8 719 64 82
  33 ;; Sweden
  34
  35 ;;; Code:
  36
  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                  (if (consp key)
  44                      (set-char-table-range description key "case-invariant")
  45                    (aset
  46                     description key
  47                     (cond ((not (natnump value))
  48                            "case-invariant")
  49                           ((/= key (downcase key))
  50                            (concat "uppercase, matches "
  51                                    (char-to-string (downcase key))))
  52                           ((/= key (upcase key))
  53                            (concat "lowercase, matches "
  54                                    (char-to-string (upcase key))))
  55                           (t "case-invariant"))))))
  56      (current-case-table))
  57     (save-excursion
  58      (with-output-to-temp-buffer "*Help*"
  59        (set-buffer standard-output)
  60        (describe-vector description)
  61        (help-mode)))))
  62
  63 (defun copy-case-table (case-table)
  64   (let ((copy (copy-sequence case-table)))
  65     ;; Clear out the extra slots so that they will be
  66     ;; recomputed from the main (downcase) table.
  67     (set-char-table-extra-slot copy 0 nil)
  68     (set-char-table-extra-slot copy 1 nil)
  69     (set-char-table-extra-slot copy 2 nil)
  70     copy))
  71
  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 (defun set-case-syntax-pair (uc lc table)
  91   "Make characters UC and LC a pair of inter-case-converting letters.
  92 This sets the entries for characters UC and LC in TABLE, which is a string
  93 that will be used as the downcase part of a case table.
  94 It also modifies `standard-syntax-table' to give them the syntax of
  95 word constituents."
  96   (aset table uc lc)
  97   (aset table lc lc)
  98   (set-char-table-extra-slot table 0 nil)
  99   (set-char-table-extra-slot table 1 nil)
 100   (set-char-table-extra-slot table 2 nil)
 101   (modify-syntax-entry lc "w   " (standard-syntax-table))
 102   (modify-syntax-entry uc "w   " (standard-syntax-table)))
 103
 104 (defun set-case-syntax (c syntax table)
 105   "Make character C case-invariant with syntax SYNTAX.
 106 This sets the entry for character C in TABLE, which is a string
 107 that will be used as the downcase part of a case table.
 108 It also modifies `standard-syntax-table'.
 109 SYNTAX should be \" \", \"w\", \".\" or \"_\"."
 110   (aset table c c)
 111   (set-char-table-extra-slot table 0 nil)
 112   (set-char-table-extra-slot table 1 nil)
 113   (set-char-table-extra-slot table 2 nil)
 114   (modify-syntax-entry c syntax (standard-syntax-table)))
 115
 116 (provide 'case-table)
 117
 118 ;;; arch-tag: 3c2cf885-2c9a-449a-9972-2e269191896d
 119 ;;; case-table.el ends here