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;;; case-table.el --- code to extend the character set and support case tables
;; Copyright (C) 1988, 1994 Free Software Foundation, Inc.
;; Author: Howard Gayle
;; Maintainer: FSF
;; Keywords: i18n
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;; Written by:
;; TN/ETX/TX/UMG Howard Gayle UUCP : seismo!enea!erix!howard
;; Telefonaktiebolaget L M Ericsson Phone: +46 8 719 55 65
;; Ericsson Telecom Telex: 14910 ERIC S
;; S-126 25 Stockholm FAX : +46 8 719 64 82
;; Sweden
;;; Code:
(defvar set-case-syntax-offset 0)
(defvar set-case-syntax-set-multibyte nil)
(defun describe-buffer-case-table ()
"Describe the case table of the current buffer."
(interactive)
(let ((description (make-char-table 'case-table)))
(map-char-table
(function (lambda (key value)
(aset
description key
(cond ((not (natnump value))
"case-invariant")
((/= key (downcase key))
(concat "uppercase, matches "
(char-to-string (downcase key))))
((/= key (upcase key))
(concat "lowercase, matches "
(char-to-string (upcase key))))
(t "case-invariant")))))
(current-case-table))
(save-excursion
(with-output-to-temp-buffer "*Help*"
(set-buffer standard-output)
(describe-vector description)
(help-mode)))))
(defun copy-case-table (case-table)
(let ((copy (copy-sequence case-table)))
;; Clear out the extra slots so that they will be
;; recomputed from the main (downcase) table.
(set-char-table-extra-slot copy 0 nil)
(set-char-table-extra-slot copy 1 nil)
(set-char-table-extra-slot copy 2 nil)
copy))
(defsubst set-case-syntax-1 (char)
"Offset CHAR by `set-case-syntax-offset' if CHAR is a non-ASCII 8-bit char."
(if (and (>= char 128) (< char 256))
(+ char set-case-syntax-offset)
char))
(defun set-case-syntax-delims (l r table)
"Make characters L and R a matching pair of non-case-converting delimiters.
This sets the entries for L and R in TABLE, which is a string
that will be used as the downcase part of a case table.
It also modifies `standard-syntax-table' to
indicate left and right delimiters."
(setq l (set-case-syntax-1 l))
(setq r (set-case-syntax-1 r))
(aset table l l)
(aset table r r)
;; Clear out the extra slots so that they will be
;; recomputed from the main (downcase) table.
(set-char-table-extra-slot table 0 nil)
(set-char-table-extra-slot table 1 nil)
(set-char-table-extra-slot table 2 nil)
(modify-syntax-entry l (concat "(" (char-to-string r) " ")
(standard-syntax-table))
(modify-syntax-entry r (concat ")" (char-to-string l) " ")
(standard-syntax-table)))
(defun set-case-syntax-pair (uc lc table)
"Make characters UC and LC a pair of inter-case-converting letters.
This sets the entries for characters UC and LC in TABLE, which is a string
that will be used as the downcase part of a case table.
It also modifies `standard-syntax-table' to give them the syntax of
word constituents."
(unless (= (charset-bytes (char-charset uc))
(charset-bytes (char-charset lc)))
(error "Can't casify chars with different `charset-bytes' values"))
(setq uc (set-case-syntax-1 uc))
(setq lc (set-case-syntax-1 lc))
(aset table uc lc)
(aset table lc lc)
(set-char-table-extra-slot table 0 nil)
(set-char-table-extra-slot table 1 nil)
(set-char-table-extra-slot table 2 nil)
(modify-syntax-entry lc "w " (standard-syntax-table))
(modify-syntax-entry uc "w " (standard-syntax-table)))
(defun set-case-syntax (c syntax table)
"Make character C case-invariant with syntax SYNTAX.
This sets the entry for character C in TABLE, which is a string
that will be used as the downcase part of a case table.
It also modifies `standard-syntax-table'.
SYNTAX should be \" \", \"w\", \".\" or \"_\"."
(setq c (set-case-syntax-1 c))
(aset table c c)
(set-char-table-extra-slot table 0 nil)
(set-char-table-extra-slot table 1 nil)
(set-char-table-extra-slot table 2 nil)
(modify-syntax-entry c syntax (standard-syntax-table)))
(provide 'case-table)
;;; case-table.el ends here
|
