lisp/case-table.el

   1 ;;; case-table.el --- code to extend the character set and support case tables
   2
   3 ;; Copyright (C) 1988, 1994, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007, 2008 Free Software Foundation, Inc.
   5
   6 ;; Author: Howard Gayle
   7 ;; Maintainer: FSF
   8 ;; Keywords: i18n
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software; you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation; either version 3, or (at your option)
  15 ;; any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  24 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  25 ;; Boston, MA 02110-1301, USA.
  26
  27 ;;; Commentary:
  28
  29 ;; Written by:
  30 ;; TN/ETX/TX/UMG Howard Gayle        UUCP : seismo!enea!erix!howard
  31 ;; Telefonaktiebolaget L M Ericsson  Phone: +46 8 719 55 65
  32 ;; Ericsson Telecom                  Telex: 14910 ERIC S
  33 ;; S-126 25 Stockholm                FAX  : +46 8 719 64 82
  34 ;; Sweden
  35
  36 ;;; Code:
  37
  38 (defun describe-buffer-case-table ()
  39   "Describe the case table of the current buffer."
  40   (interactive)
  41   (let ((description (make-char-table 'case-table)))
  42     (map-char-table
  43      (function (lambda (key value)
  44                  (if (consp key)
  45                      (set-char-table-range description key "case-invariant")
  46                    (aset
  47                     description key
  48                     (cond ((not (natnump value))
  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 (defun get-upcase-table (case-table)
  65   "Return the upcase table of CASE-TABLE."
  66   (or (char-table-extra-slot case-table 0)
  67       ;; Setup all extra slots of CASE-TABLE by temporarily selecting
  68       ;; it as the standard case table.
  69       (let ((old (standard-case-table)))
  70         (unwind-protect
  71             (progn
  72               (set-standard-case-table case-table)
  73               (char-table-extra-slot case-table 0))
  74           (or (eq case-table old)
  75               (set-standard-case-table old))))))
  76
  77 (defun copy-case-table (case-table)
  78   (let ((copy (copy-sequence case-table))
  79         (up (char-table-extra-slot case-table 0)))
  80     ;; Clear out the extra slots (except for upcase table) so that
  81     ;; they will be recomputed from the main (downcase) table.
  82     (if up
  83         (set-char-table-extra-slot copy 0 (copy-sequence up)))
  84     (set-char-table-extra-slot copy 1 nil)
  85     (set-char-table-extra-slot copy 2 nil)
  86     copy))
  87
  88 (defun set-case-syntax-delims (l r table)
  89   "Make characters L and R a matching pair of non-case-converting delimiters.
  90 This sets the entries for L and R in TABLE, which is a string
  91 that will be used as the downcase part of a case table.
  92 It also modifies `standard-syntax-table' to
  93 indicate left and right delimiters."
  94   (aset table l l)
  95   (aset table r r)
  96   (let ((up (get-upcase-table table)))
  97     (aset up l l)
  98     (aset up r r))
  99   ;; Clear out the extra slots so that they will be
 100   ;; recomputed from the main (downcase) table and upcase table.
 101   (set-char-table-extra-slot table 1 nil)
 102   (set-char-table-extra-slot table 2 nil)
 103   (modify-syntax-entry l (concat "(" (char-to-string r) "  ")
 104                        (standard-syntax-table))
 105   (modify-syntax-entry r (concat ")" (char-to-string l) "  ")
 106                        (standard-syntax-table)))
 107
 108 (defun set-case-syntax-pair (uc lc table)
 109   "Make characters UC and LC a pair of inter-case-converting letters.
 110 This sets the entries for characters UC and LC in TABLE, which is a string
 111 that will be used as the downcase part of a case table.
 112 It also modifies `standard-syntax-table' to give them the syntax of
 113 word constituents."
 114   (aset table uc lc)
 115   (aset table lc lc)
 116   (let ((up (get-upcase-table table)))
 117     (aset up uc uc)
 118     (aset up lc uc))
 119   ;; Clear out the extra slots so that they will be
 120   ;; recomputed from the main (downcase) table and upcase table.
 121   (set-char-table-extra-slot table 1 nil)
 122   (set-char-table-extra-slot table 2 nil)
 123   (modify-syntax-entry lc "w   " (standard-syntax-table))
 124   (modify-syntax-entry uc "w   " (standard-syntax-table)))
 125
 126 (defun set-upcase-syntax (uc lc table)
 127   "Make character UC an upcase of character LC.
 128 It also modifies `standard-syntax-table' to give them the syntax of
 129 word constituents."
 130   (aset table lc lc)
 131   (let ((up (get-upcase-table table)))
 132     (aset up uc uc)
 133     (aset up lc uc))
 134   ;; Clear out the extra slots so that they will be
 135   ;; recomputed from the main (downcase) table and upcase table.
 136   (set-char-table-extra-slot table 1 nil)
 137   (set-char-table-extra-slot table 2 nil)
 138   (modify-syntax-entry lc "w   " (standard-syntax-table))
 139   (modify-syntax-entry uc "w   " (standard-syntax-table)))
 140
 141 (defun set-downcase-syntax (uc lc table)
 142   "Make character LC a downcase of character UC.
 143 It also modifies `standard-syntax-table' to give them the syntax of
 144 word constituents."
 145   (aset table uc lc)
 146   (aset table lc lc)
 147   (let ((up (get-upcase-table table)))
 148     (aset up uc uc))
 149   ;; Clear out the extra slots so that they will be
 150   ;; recomputed from the main (downcase) table and upcase table.
 151   (set-char-table-extra-slot table 1 nil)
 152   (set-char-table-extra-slot table 2 nil)
 153   (modify-syntax-entry lc "w   " (standard-syntax-table))
 154   (modify-syntax-entry uc "w   " (standard-syntax-table)))
 155
 156 (defun set-case-syntax (c syntax table)
 157   "Make character C case-invariant with syntax SYNTAX.
 158 This sets the entry for character C in TABLE, which is a string
 159 that will be used as the downcase part of a case table.
 160 It also modifies `standard-syntax-table'.
 161 SYNTAX should be \" \", \"w\", \".\" or \"_\"."
 162   (aset table c c)
 163   (let ((up (get-upcase-table table)))
 164     (aset up c c))
 165   ;; Clear out the extra slots so that they will be
 166   ;; recomputed from the main (downcase) table and upcase table.
 167   (set-char-table-extra-slot table 1 nil)
 168   (set-char-table-extra-slot table 2 nil)
 169   (modify-syntax-entry c syntax (standard-syntax-table)))
 170
 171 (provide 'case-table)
 172
 173 ;;; arch-tag: 3c2cf885-2c9a-449a-9972-2e269191896d
 174 ;;; case-table.el ends here