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[emacs.git] / lisp / case-table.el
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1 ;;; case-table.el --- code to extend the character set and support case tables
3 ;; Copyright (C) 1988, 1994 Free Software Foundation, Inc.
5 ;; Author: Howard Gayle
6 ;; Maintainer: FSF
7 ;; Keywords: i18n
9 ;; This file is part of GNU Emacs.
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.
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.
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.
26 ;;; Commentary:
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
35 ;;; Code:
37 (defvar set-case-syntax-offset 0)
39 (defvar set-case-syntax-set-multibyte nil)
41 (defun describe-buffer-case-table ()
42 "Describe the case table of the current buffer."
43 (interactive)
44 (let ((description (make-char-table 'case-table)))
45 (map-char-table
46 (function (lambda (key value)
47 (aset
48 description key
49 (cond ((not (natnump value))
50 "case-invariant")
51 ((/= key (downcase key))
52 (concat "uppercase, matches "
53 (char-to-string (downcase key))))
54 ((/= key (upcase key))
55 (concat "lowercase, matches "
56 (char-to-string (upcase key))))
57 (t "case-invariant")))))
58 (current-case-table))
59 (save-excursion
60 (with-output-to-temp-buffer "*Help*"
61 (set-buffer standard-output)
62 (describe-vector description)
63 (help-mode)))))
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))
74 (defsubst set-case-syntax-1 (char)
75 "Offset CHAR by `set-case-syntax-offset' if CHAR is a non-ASCII 8-bit char."
76 (if (and (>= char 128) (< char 256))
77 (+ char set-case-syntax-offset)
78 char))
80 (defun set-case-syntax-delims (l r table)
81 "Make characters L and R a matching pair of non-case-converting delimiters.
82 This sets the entries for L and R in TABLE, which is a string
83 that will be used as the downcase part of a case table.
84 It also modifies `standard-syntax-table' to
85 indicate left and right delimiters."
86 (setq l (set-case-syntax-1 l))
87 (setq r (set-case-syntax-1 r))
88 (aset table l l)
89 (aset table r r)
90 ;; Clear out the extra slots so that they will be
91 ;; recomputed from the main (downcase) table.
92 (set-char-table-extra-slot table 0 nil)
93 (set-char-table-extra-slot table 1 nil)
94 (set-char-table-extra-slot table 2 nil)
95 (modify-syntax-entry l (concat "(" (char-to-string r) " ")
96 (standard-syntax-table))
97 (modify-syntax-entry r (concat ")" (char-to-string l) " ")
98 (standard-syntax-table)))
100 (defun set-case-syntax-pair (uc lc table)
101 "Make characters UC and LC a pair of inter-case-converting letters.
102 This sets the entries for characters UC and LC in TABLE, which is a string
103 that will be used as the downcase part of a case table.
104 It also modifies `standard-syntax-table' to give them the syntax of
105 word constituents."
106 (unless (= (charset-bytes (char-charset uc))
107 (charset-bytes (char-charset lc)))
108 (error "Can't casify chars with different `charset-bytes' values"))
109 (setq uc (set-case-syntax-1 uc))
110 (setq lc (set-case-syntax-1 lc))
111 (aset table uc lc)
112 (aset table lc lc)
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 lc "w " (standard-syntax-table))
117 (modify-syntax-entry uc "w " (standard-syntax-table)))
119 (defun set-case-syntax (c syntax table)
120 "Make character C case-invariant with syntax SYNTAX.
121 This sets the entry for character C in TABLE, which is a string
122 that will be used as the downcase part of a case table.
123 It also modifies `standard-syntax-table'.
124 SYNTAX should be \" \", \"w\", \".\" or \"_\"."
125 (setq c (set-case-syntax-1 c))
126 (aset table c c)
127 (set-char-table-extra-slot table 0 nil)
128 (set-char-table-extra-slot table 1 nil)
129 (set-char-table-extra-slot table 2 nil)
130 (modify-syntax-entry c syntax (standard-syntax-table)))
132 (provide 'case-table)
134 ;;; arch-tag: 3c2cf885-2c9a-449a-9972-2e269191896d
135 ;;; case-table.el ends here