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310 lines
11 KiB
EmacsLisp
310 lines
11 KiB
EmacsLisp
;;; encoded-kb.el --- handler to input multibyte characters encoded somehow
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;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
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;; Licensed to the Free Software Foundation.
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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 2, or (at your option)
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;; 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; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;;; Code:
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;; Usually this map is empty (even if Encoded-kbd mode is on), but if
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;; the keyboard coding system is iso-2022-based, it defines dummy key
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;; bindings for ESC $ ..., etc. so that those bindings in
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;; key-translation-map take effect.
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(defconst encoded-kbd-mode-map (make-sparse-keymap)
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"Keymap for Encoded-kbd minor mode.")
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;; Subsidiary keymaps for handling ISO2022 escape sequences.
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(defvar encoded-kbd-iso2022-esc-map
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(let ((map (make-sparse-keymap)))
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(define-key map "$" 'encoded-kbd-iso2022-esc-dollar-prefix)
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(define-key map "(" 'encoded-kbd-iso2022-designation-prefix)
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(define-key map ")" 'encoded-kbd-iso2022-designation-prefix)
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(define-key map "," 'encoded-kbd-iso2022-designation-prefix)
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(define-key map "-" 'encoded-kbd-iso2022-designation-prefix)
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map)
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"Keymap for handling ESC code in Encoded-kbd mode.")
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(fset 'encoded-kbd-iso2022-esc-prefix encoded-kbd-iso2022-esc-map)
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(defvar encoded-kbd-iso2022-esc-dollar-map
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(let ((map (make-sparse-keymap)))
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(define-key map "(" 'encoded-kbd-iso2022-designation-prefix)
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(define-key map ")" 'encoded-kbd-iso2022-designation-prefix)
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(define-key map "," 'encoded-kbd-iso2022-designation-prefix)
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(define-key map "-" 'encoded-kbd-iso2022-designation-prefix)
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(define-key map "@" 'encoded-kbd-iso2022-designation)
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(define-key map "A" 'encoded-kbd-iso2022-designation)
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(define-key map "B" 'encoded-kbd-iso2022-designation)
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map)
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"Keymap for handling ESC $ sequence in Encoded-kbd mode.")
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(fset 'encoded-kbd-iso2022-esc-dollar-prefix
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encoded-kbd-iso2022-esc-dollar-map)
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(defvar encoded-kbd-iso2022-designation-map
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(let ((map (make-sparse-keymap))
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(l charset-list)
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final-char)
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(while l
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(setq final-char (charset-iso-final-char (car l)))
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(if (> final-char 0)
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(define-key map (char-to-string final-char)
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'encoded-kbd-iso2022-designation))
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(setq l (cdr l)))
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map)
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"Keymap for handling ISO2022 designation sequence in Encoded-kbd mode.")
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(fset 'encoded-kbd-iso2022-designation-prefix
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encoded-kbd-iso2022-designation-map)
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;; Keep information of designation state of ISO2022 encoding. When
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;; Encoded-kbd mode is on, this is set to a vector of length 4, the
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;; elements are character sets currently designated to graphic
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;; registers 0 thru 3.
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(defvar encoded-kbd-iso2022-designations nil)
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(put 'encoded-kbd-iso2022-designations 'permanent-local t)
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;; Keep information of invocation state of ISO2022 encoding. When
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;; Encoded-kbd mode is on, this is set to a vector of length 3,
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;; graphic register numbers currently invoked to graphic plane 1 and
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;; 2, and a single shifted graphic register number.
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(defvar encoded-kbd-iso2022-invocations nil)
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(put 'encoded-kbd-iso2022-invocations 'permanent-local t)
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(defsubst encoded-kbd-last-key ()
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(let ((keys (this-single-command-keys)))
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(aref keys (1- (length keys)))))
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(defun encoded-kbd-iso2022-designation (ignore)
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"Do ISO2022 designation according to the current key in Encoded-kbd mode.
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The following key sequence may cause multilingual text insertion."
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(let ((key-seq (this-single-command-keys))
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(prev-g0-charset (aref encoded-kbd-iso2022-designations
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(aref encoded-kbd-iso2022-invocations 0)))
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intermediate-char final-char
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reg dimension chars charset)
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(if (= (length key-seq) 4)
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;; ESC $ <intermediate-char> <final-char>
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(setq intermediate-char (aref key-seq 2)
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dimension 2
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chars (if (< intermediate-char ?,) 94 96)
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final-char (aref key-seq 3)
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reg (mod intermediate-char 4))
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(if (= (aref key-seq 1) ?$)
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;; ESC $ <final-char>
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(setq dimension 2
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chars 94
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final-char (aref key-seq 2)
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reg 0)
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;; ESC <intermediate-char> <final-char>
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(setq intermediate-char (aref key-seq 1)
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dimension 1
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chars (if (< intermediate-char ?,) 94 96)
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final-char (aref key-seq 2)
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reg (mod intermediate-char 4))))
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(aset encoded-kbd-iso2022-designations reg
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(iso-charset dimension chars final-char)))
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"")
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(defun encoded-kbd-iso2022-single-shift (ignore)
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(let ((char (encoded-kbd-last-key)))
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(aset encoded-kbd-iso2022-invocations 2 (if (= char ?\216) 2 3)))
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"")
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(defun encoded-kbd-self-insert-iso2022-7bit (ignore)
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(let ((char (encoded-kbd-last-key))
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(charset (aref encoded-kbd-iso2022-designations
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(or (aref encoded-kbd-iso2022-invocations 2)
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(aref encoded-kbd-iso2022-invocations 0)))))
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(aset encoded-kbd-iso2022-invocations 2 nil)
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(vector (if (= (charset-dimension charset) 1)
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(make-char charset char)
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(make-char charset char (read-char-exclusive))))))
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(defun encoded-kbd-self-insert-iso2022-8bit (ignore)
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(let ((char (encoded-kbd-last-key))
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(charset (aref encoded-kbd-iso2022-designations
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(or (aref encoded-kbd-iso2022-invocations 2)
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(aref encoded-kbd-iso2022-invocations 1)))))
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(aset encoded-kbd-iso2022-invocations 2 nil)
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(vector (if (= (charset-dimension charset) 1)
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(make-char charset char)
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(make-char charset char (read-char-exclusive))))))
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(defun encoded-kbd-self-insert-sjis (ignore)
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(let ((char (encoded-kbd-last-key)))
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(vector
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(if (or (< char ?\xA0) (>= char ?\xE0))
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(decode-sjis-char (+ (ash char 8) (read-char-exclusive)))
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(make-char 'katakana-jisx0201 char)))))
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(defun encoded-kbd-self-insert-big5 (ignore)
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(let ((char (encoded-kbd-last-key)))
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(vector
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(decode-big5-char (+ (ash char 8) (read-char-exclusive))))))
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(defun encoded-kbd-self-insert-ccl (ignore)
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(let ((str (char-to-string (encoded-kbd-last-key)))
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(ccl (car (aref (coding-system-spec (keyboard-coding-system)) 4)))
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(vec [nil nil nil nil nil nil nil nil nil])
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result)
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(while (= (length (setq result (ccl-execute-on-string ccl vec str t))) 0)
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(dotimes (i 9) (aset vec i nil))
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(setq str (format "%s%c" str (read-char-exclusive))))
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(vector (aref result 0))))
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(defun encoded-kbd-setup-keymap (coding)
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;; At first, reset the keymap.
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(define-key encoded-kbd-mode-map "\e" nil)
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;; Then setup the keymap according to the keyboard coding system.
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(cond
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((eq (coding-system-type coding) 1) ; SJIS
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(let ((i 128))
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(while (< i 256)
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(define-key key-translation-map
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(vector i) 'encoded-kbd-self-insert-sjis)
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(setq i (1+ i))))
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8)
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((eq (coding-system-type coding) 3) ; Big5
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(let ((i 161))
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(while (< i 255)
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(define-key key-translation-map
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(vector i) 'encoded-kbd-self-insert-big5)
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(setq i (1+ i))))
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8)
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((eq (coding-system-type coding) 2) ; ISO-2022
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(let ((flags (coding-system-flags coding))
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use-designation)
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(if (aref flags 8)
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nil ; Don't support locking-shift.
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(setq encoded-kbd-iso2022-designations (make-vector 4 nil)
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encoded-kbd-iso2022-invocations (make-vector 3 nil))
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(dotimes (i 4)
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(if (aref flags i)
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(if (charsetp (aref flags i))
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(aset encoded-kbd-iso2022-designations
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i (aref flags i))
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(setq use-designation t)
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(if (charsetp (car-safe (aref flags i)))
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(aset encoded-kbd-iso2022-designations
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i (car (aref flags i)))))))
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(aset encoded-kbd-iso2022-invocations 0 0)
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(if (aref encoded-kbd-iso2022-designations 1)
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(aset encoded-kbd-iso2022-invocations 1 1))
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(when use-designation
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(define-key encoded-kbd-mode-map "\e" 'encoded-kbd-iso2022-esc-prefix)
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(define-key key-translation-map "\e" 'encoded-kbd-iso2022-esc-prefix))
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(when (or (aref flags 2) (aref flags 3))
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(define-key key-translation-map
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[?\216] 'encoded-kbd-iso2022-single-shift)
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(define-key key-translation-map
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[?\217] 'encoded-kbd-iso2022-single-shift))
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(or (eq (aref flags 0) 'ascii)
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(dotimes (i 96)
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(define-key key-translation-map
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(vector (+ 32 i)) 'encoded-kbd-self-insert-iso2022-7bit)))
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(if (aref flags 7)
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t
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(dotimes (i 96)
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(define-key key-translation-map
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(vector (+ 160 i)) 'encoded-kbd-self-insert-iso2022-8bit))
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8))))
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((eq (coding-system-type coding) 4) ; CCL-base
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(let ((valid-codes (or (coding-system-get coding 'valid-codes)
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'((128 . 255))))
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elt from to valid)
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(while valid-codes
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(setq elt (car valid-codes) valid-codes (cdr valid-codes))
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(if (consp elt)
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(setq from (car elt) to (cdr elt))
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(setq from (setq to elt)))
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(while (<= from to)
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(if (>= from 128)
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(define-key key-translation-map
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(vector from) 'encoded-kbd-self-insert-ccl))
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(setq from (1+ from))))
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8))
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(t
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nil)))
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;; key-translation-map at the time Encoded-kbd mode is turned on is
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;; saved here.
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(defvar saved-key-translation-map nil)
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;; Input mode at the time Encoded-kbd mode is turned on is saved here.
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(defvar saved-input-mode nil)
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(put 'encoded-kbd-mode 'permanent-local t)
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;;;###autoload
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(define-minor-mode encoded-kbd-mode
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"Toggle Encoded-kbd minor mode.
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With arg, turn Encoded-kbd mode on if and only if arg is positive.
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You should not turn this mode on manually, instead use the command
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\\[set-keyboard-coding-system] which turns on or off this mode
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automatically.
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In Encoded-kbd mode, a text sent from keyboard is accepted
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as a multilingual text encoded in a coding system set by
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\\[set-keyboard-coding-system]."
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:global t :group 'keyboard :group 'mule
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(if encoded-kbd-mode
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;; We are turning on Encoded-kbd mode.
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(let ((coding (keyboard-coding-system))
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result)
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(or saved-key-translation-map
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(if (keymapp key-translation-map)
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(setq saved-key-translation-map
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(copy-keymap key-translation-map))
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(setq key-translation-map (make-sparse-keymap))))
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(or saved-input-mode
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(setq saved-input-mode
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(current-input-mode)))
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(setq result (and coding (encoded-kbd-setup-keymap coding)))
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(if result
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(if (eq result 8)
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(set-input-mode
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(nth 0 saved-input-mode)
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(nth 1 saved-input-mode)
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'use-8th-bit
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(nth 3 saved-input-mode)))
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(setq encoded-kbd-mode nil
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saved-key-translation-map nil
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saved-input-mode nil)
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(error "Unsupported coding system in Encoded-kbd mode: %S"
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coding)))
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;; We are turning off Encoded-kbd mode.
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(setq key-translation-map saved-key-translation-map
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saved-key-translation-map nil)
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(apply 'set-input-mode saved-input-mode)
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(setq saved-input-mode nil)))
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(provide 'encoded-kb)
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;;; arch-tag: 76f0f9b3-65e7-45c3-b692-59509a87ad44
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;;; encoded-kb.el ends here
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