code.delx.au - gnu-emacs/blob - 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 (defvar set-case-syntax-offset 0)
  38
  39 ;;;###autoload
  40 (defun describe-buffer-case-table ()
  41   "Describe the case table of the current buffer."
  42   (interactive)
  43   (let ((description (make-char-table 'case-table)))
  44     (map-char-table
  45      (function (lambda (key value)
  46                  (set-char-table-range
  47                   description key
  48                   (cond ((null key)
  49                          "case-invariant")
  50                         ((/= key (downcase key))
  51                          (concat "uppercase, matches "
  52                                  (char-to-string (downcase key))))
  53                         ((/= key (upcase key))
  54                          (concat "lowercase, matches "
  55                                  (char-to-string (upcase key))))
  56                         (t "case-invariant")))))
  57      (current-case-table))
  58     (save-excursion
  59      (with-output-to-temp-buffer "*Help*"
  60        (set-buffer standard-output)
  61        (describe-vector description)
  62        (help-mode)))))
  63
  64 ;;;###autoload
  65 (defun copy-case-table (case-table)
  66   (let ((copy (copy-sequence case-table)))
  67     ;; Clear out the extra slots so that they will be
  68     ;; recomputed from the main (downcase) table.
  69     (set-char-table-extra-slot copy 0 nil)
  70     (set-char-table-extra-slot copy 1 nil)
  71     (set-char-table-extra-slot copy 2 nil)
  72     copy))
  73
  74 ;;;###autoload
  75 (defun set-case-syntax-delims (l r table)
  76   "Make characters L and R a matching pair of non-case-converting delimiters.
  77 This sets the entries for L and R in TABLE, which is a string
  78 that will be used as the downcase part of a case table.
  79 It also modifies `standard-syntax-table' to
  80 indicate left and right delimiters."
  81   (setq l (+ set-case-syntax-offset l))
  82   (setq r (+ set-case-syntax-offset r))
  83   (aset table l l)
  84   (aset table r r)
  85   ;; Clear out the extra slots so that they will be
  86   ;; recomputed from the main (downcase) table.
  87   (set-char-table-extra-slot table 0 nil)
  88   (set-char-table-extra-slot table 1 nil)
  89   (set-char-table-extra-slot table 2 nil)
  90   (modify-syntax-entry l (concat "(" (char-to-string r) "  ")
  91                        (standard-syntax-table))
  92   (modify-syntax-entry r (concat ")" (char-to-string l) "  ")
  93                        (standard-syntax-table)))
  94
  95 ;;;###autoload
  96 (defun set-case-syntax-pair (uc lc table)
  97   "Make characters UC and LC a pair of inter-case-converting letters.
  98 This sets the entries for characters UC and LC in TABLE, which is a string
  99 that will be used as the downcase part of a case table.
 100 It also modifies `standard-syntax-table' to give them the syntax of
 101 word constituents."
 102   (setq uc (+ set-case-syntax-offset uc))
 103   (setq lc (+ set-case-syntax-offset lc))
 104   (aset table uc lc)
 105   (aset table lc lc)
 106   (set-char-table-extra-slot table 0 nil)
 107   (set-char-table-extra-slot table 1 nil)
 108   (set-char-table-extra-slot table 2 nil)
 109   (modify-syntax-entry lc "w   " (standard-syntax-table))
 110   (modify-syntax-entry uc "w   " (standard-syntax-table)))
 111
 112 ;;;###autoload
 113 (defun set-case-syntax (c syntax table)
 114   "Make character C case-invariant with syntax SYNTAX.
 115 This sets the entry for character C in TABLE, which is a string
 116 that will be used as the downcase part of a case table.
 117 It also modifies `standard-syntax-table'.
 118 SYNTAX should be \" \", \"w\", \".\" or \"_\"."
 119   (setq c (+ set-case-syntax-offset c))
 120   (aset table c c)
 121   (set-char-table-extra-slot table 0 nil)
 122   (set-char-table-extra-slot table 1 nil)
 123   (set-char-table-extra-slot table 2 nil)
 124   (modify-syntax-entry c syntax (standard-syntax-table)))
 125
 126 (provide 'case-table)
 127
 128 ;;; case-table.el ends here