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;;; case-table.el --- code to extend the character set and support case tables
;; Copyright (C) 1988, 1994, 2001-2013 Free Software Foundation, Inc.
;; Author: Howard Gayle
;; Maintainer: FSF
;; Keywords: i18n
;; Package: emacs
;; 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
;;; 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:
(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)
(if (not (natnump value))
(if (consp key)
(set-char-table-range description key "case-invariant")
(aset description key "case-invariant"))
(let (from to)
(if (consp key)
(setq from (car key) to (cdr key))
(setq from (setq to key)))
(while (<= from to)
(aset
description from
(cond ((/= from (downcase from))
(concat "uppercase, matches "
(char-to-string (downcase from))))
((/= from (upcase from))
(concat "lowercase, matches "
(char-to-string (upcase from))))
(t "case-invariant")))
(setq from (1+ from)))))))
(current-case-table))
(save-excursion
(with-output-to-temp-buffer "*Help*"
(set-buffer standard-output)
(describe-vector description)
(help-mode)))))
(defun get-upcase-table (case-table)
"Return the upcase table of CASE-TABLE."
(or (char-table-extra-slot case-table 0)
;; Setup all extra slots of CASE-TABLE by temporarily selecting
;; it as the standard case table.
(let ((old (standard-case-table)))
(unwind-protect
(progn
(set-standard-case-table case-table)
(char-table-extra-slot case-table 0))
(or (eq case-table old)
(set-standard-case-table old))))))
(defun copy-case-table (case-table)
(let ((copy (copy-sequence case-table))
(up (char-table-extra-slot case-table 0)))
;; Clear out the extra slots (except for upcase table) so that
;; they will be recomputed from the main (downcase) table.
(if up
(set-char-table-extra-slot copy 0 (copy-sequence up)))
(set-char-table-extra-slot copy 1 nil)
(set-char-table-extra-slot copy 2 nil)
copy))
(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."
(aset table l l)
(aset table r r)
(let ((up (get-upcase-table table)))
(aset up l l)
(aset up r r))
;; Clear out the extra slots so that they will be
;; recomputed from the main (downcase) table and upcase table.
(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."
(aset table uc lc)
(aset table lc lc)
(let ((up (get-upcase-table table)))
(aset up uc uc)
(aset up lc uc))
;; Clear out the extra slots so that they will be
;; recomputed from the main (downcase) table and upcase table.
(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-upcase-syntax (uc lc table)
"Make character UC an upcase of character LC.
It also modifies `standard-syntax-table' to give them the syntax of
word constituents."
(aset table lc lc)
(let ((up (get-upcase-table table)))
(aset up uc uc)
(aset up lc uc))
;; Clear out the extra slots so that they will be
;; recomputed from the main (downcase) table and upcase table.
(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-downcase-syntax (uc lc table)
"Make character LC a downcase of character UC.
It also modifies `standard-syntax-table' to give them the syntax of
word constituents."
(aset table uc lc)
(aset table lc lc)
(let ((up (get-upcase-table table)))
(aset up uc uc))
;; Clear out the extra slots so that they will be
;; recomputed from the main (downcase) table and upcase table.
(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 \"_\"."
(aset table c c)
(let ((up (get-upcase-table table)))
(aset up c c))
;; Clear out the extra slots so that they will be
;; recomputed from the main (downcase) table and upcase table.
(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
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