186 lines
7.1 KiB
EmacsLisp
186 lines
7.1 KiB
EmacsLisp
;;; case-table.el --- code to extend the character set and support case tables -*- lexical-binding: t -*-
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;; Copyright (C) 1988, 1994, 2001-2024 Free Software Foundation, Inc.
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;; Author: Howard Gayle
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;; Maintainer: emacs-devel@gnu.org
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;; Keywords: i18n
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;; Package: emacs
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Written by:
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;; TN/ETX/TX/UMG Howard Gayle UUCP : seismo!enea!erix!howard
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;; Telefonaktiebolaget L M Ericsson Phone: +46 8 719 55 65
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;; Ericsson Telecom Telex: 14910 ERIC S
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;; S-126 25 Stockholm FAX : +46 8 719 64 82
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;; Sweden
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;;; Code:
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(defun describe-buffer-case-table ()
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"Describe the case table of the current buffer."
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(interactive)
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(let ((description (make-char-table 'case-table)))
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(map-char-table
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(lambda (key value)
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(if (not (natnump value))
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(if (consp key)
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(set-char-table-range description key "case-invariant")
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(aset description key "case-invariant"))
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(let (from to)
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(if (consp key)
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(setq from (car key) to (cdr key))
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(setq from (setq to key)))
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(while (<= from to)
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(aset
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description from
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(cond ((/= from (downcase from))
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(concat "uppercase, matches "
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(char-to-string (downcase from))))
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((/= from (upcase from))
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(concat "lowercase, matches "
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(char-to-string (upcase from))))
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(t "case-invariant")))
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(setq from (1+ from))))))
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(current-case-table))
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(save-excursion
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(with-output-to-temp-buffer "*Help*"
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(set-buffer standard-output)
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(describe-vector description)
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(help-mode)))))
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(defun case-table-get-table (case-table table)
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"Return the TABLE of CASE-TABLE.
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TABLE can be `down', `up', `eqv' or `canon'."
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(let ((slot-nb (cdr (assq table '((up . 0) (canon . 1) (eqv . 2))))))
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(or (if (eq table 'down) case-table)
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(char-table-extra-slot case-table slot-nb)
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;; Setup all extra slots of CASE-TABLE by temporarily selecting
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;; it as the standard case table.
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(let ((old (standard-case-table)))
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(unwind-protect
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(progn
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(set-standard-case-table case-table)
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(char-table-extra-slot case-table slot-nb))
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(or (eq case-table old)
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(set-standard-case-table old)))))))
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(defun get-upcase-table (case-table)
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"Return the upcase table of CASE-TABLE."
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(case-table-get-table case-table 'up))
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(make-obsolete 'get-upcase-table 'case-table-get-table "24.4")
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(defun copy-case-table (case-table)
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(let ((copy (copy-sequence case-table))
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(up (char-table-extra-slot case-table 0)))
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;; Clear out the extra slots (except for upcase table) so that
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;; they will be recomputed from the main (downcase) table.
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(if up
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(set-char-table-extra-slot copy 0 (copy-sequence up)))
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(set-char-table-extra-slot copy 1 nil)
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(set-char-table-extra-slot copy 2 nil)
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copy))
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(defun set-case-syntax-delims (l r table)
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"Make characters L and R a matching pair of non-case-converting delimiters.
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This sets the entries for L and R in TABLE, which is a string
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that will be used as the downcase part of a case table.
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It also modifies `standard-syntax-table' to
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indicate left and right delimiters."
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(aset table l l)
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(aset table r r)
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(let ((up (case-table-get-table table 'up)))
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(aset up l l)
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(aset up r r))
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;; Clear out the extra slots so that they will be
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;; recomputed from the main (downcase) table and upcase table.
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(set-char-table-extra-slot table 1 nil)
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(set-char-table-extra-slot table 2 nil)
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(modify-syntax-entry l (concat "(" (char-to-string r) " ")
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(standard-syntax-table))
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(modify-syntax-entry r (concat ")" (char-to-string l) " ")
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(standard-syntax-table)))
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(defun set-case-syntax-pair (uc lc table)
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"Make characters UC and LC a pair of inter-case-converting letters.
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This sets the entries for characters UC and LC in TABLE, which is a string
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that will be used as the downcase part of a case table.
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It also modifies `standard-syntax-table' to give them the syntax of
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word constituents."
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(aset table uc lc)
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(aset table lc lc)
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(let ((up (case-table-get-table table 'up)))
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(aset up uc uc)
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(aset up lc uc))
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;; Clear out the extra slots so that they will be
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;; recomputed from the main (downcase) table and upcase table.
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(set-char-table-extra-slot table 1 nil)
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(set-char-table-extra-slot table 2 nil)
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(modify-syntax-entry lc "w " (standard-syntax-table))
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(modify-syntax-entry uc "w " (standard-syntax-table)))
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(defun set-upcase-syntax (uc lc table)
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"Make character UC an upcase of character LC.
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It also modifies `standard-syntax-table' to give them the syntax of
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word constituents."
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(aset table lc lc)
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(let ((up (case-table-get-table table 'up)))
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(aset up uc uc)
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(aset up lc uc))
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;; Clear out the extra slots so that they will be
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;; recomputed from the main (downcase) table and upcase table.
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(set-char-table-extra-slot table 1 nil)
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(set-char-table-extra-slot table 2 nil)
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(modify-syntax-entry lc "w " (standard-syntax-table))
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(modify-syntax-entry uc "w " (standard-syntax-table)))
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(defun set-downcase-syntax (uc lc table)
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"Make character LC a downcase of character UC.
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It also modifies `standard-syntax-table' to give them the syntax of
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word constituents."
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(aset table uc lc)
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(aset table lc lc)
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(let ((up (case-table-get-table table 'up)))
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(aset up uc uc))
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;; Clear out the extra slots so that they will be
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;; recomputed from the main (downcase) table and upcase table.
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(set-char-table-extra-slot table 1 nil)
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(set-char-table-extra-slot table 2 nil)
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(modify-syntax-entry lc "w " (standard-syntax-table))
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(modify-syntax-entry uc "w " (standard-syntax-table)))
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(defun set-case-syntax (c syntax table)
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"Make character C case-invariant with syntax SYNTAX.
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This sets the entry for character C in TABLE, which is a string
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that will be used as the downcase part of a case table.
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It also modifies `standard-syntax-table'.
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SYNTAX should be \" \", \"w\", \".\" or \"_\"."
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(aset table c c)
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(let ((up (case-table-get-table table 'up)))
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(aset up c c))
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;; Clear out the extra slots so that they will be
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;; recomputed from the main (downcase) table and upcase table.
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(set-char-table-extra-slot table 1 nil)
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(set-char-table-extra-slot table 2 nil)
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(modify-syntax-entry c syntax (standard-syntax-table)))
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(provide 'case-table)
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;;; case-table.el ends here
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