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;;; encoded-kb.el --- Handler to input multibyte characters encoded somehow
;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN.
;; Licensed to the Free Software Foundation.
;; 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.
(defvar encoded-kbd-mode nil
"Non-nil if in Encoded-kbd minor mode.")
(put 'encoded-kbd-mode 'permanent-local t)
(or (assq 'encoded-kbd-mode minor-mode-alist)
(setq minor-mode-alist
(cons '(encoded-kbd-mode " Encoded-kbd") minor-mode-alist)))
(defvar encoded-kbd-mode-map
(let ((map (make-sparse-keymap))
(i 128))
(define-key map "\e" 'encoded-kbd-iso2022-esc-prefix)
(while (< i 256)
(define-key map (vector i) 'encoded-kbd-handle-8bit)
(setq i (1+ i)))
map)
"Keymap for Encoded-kbd minor mode.")
(or (assq 'encoded-kbd-mode minor-mode-map-alist)
(setq minor-mode-map-alist
(cons (cons 'encoded-kbd-mode encoded-kbd-mode-map)
minor-mode-map-alist)))
;; Subsidiary keymaps for handling ISO2022 escape sequences.
(defvar encoded-kbd-iso2022-esc-map
(let ((map (make-sparse-keymap)))
(define-key map "$" 'encoded-kbd-iso2022-esc-dollar-prefix)
(define-key map "(" 'encoded-kbd-iso2022-designation-prefix)
(define-key map ")" 'encoded-kbd-iso2022-designation-prefix)
(define-key map "," 'encoded-kbd-iso2022-designation-prefix)
(define-key map "-" 'encoded-kbd-iso2022-designation-prefix)
map)
"Keymap for handling ESC code in Encoded-kbd mode.")
(fset 'encoded-kbd-iso2022-esc-prefix encoded-kbd-iso2022-esc-map)
(defvar encoded-kbd-iso2022-esc-dollar-map
(let ((map (make-sparse-keymap)))
(define-key map "(" 'encoded-kbd-iso2022-designation-prefix)
(define-key map ")" 'encoded-kbd-iso2022-designation-prefix)
(define-key map "," 'encoded-kbd-iso2022-designation-prefix)
(define-key map "-" 'encoded-kbd-iso2022-designation-prefix)
(define-key map "@" 'encoded-kbd-iso2022-designation)
(define-key map "A" 'encoded-kbd-iso2022-designation)
(define-key map "B" 'encoded-kbd-iso2022-designation)
map)
"Keymap for handling ESC $ sequence in Encoded-kbd mode.")
(fset 'encoded-kbd-iso2022-esc-dollar-prefix
encoded-kbd-iso2022-esc-dollar-map)
(defvar encoded-kbd-iso2022-designation-map
(let ((map (make-sparse-keymap))
(l charset-list))
(while l
(define-key map
(char-to-string (charset-iso-final-char (car l)))
'encoded-kbd-iso2022-designation)
(setq l (cdr l)))
map)
"Keymap for handling ISO2022 designation sequence in Encoded-kbd mode.")
(fset 'encoded-kbd-iso2022-designation-prefix
encoded-kbd-iso2022-designation-map)
(defvar encoded-kbd-iso2022-non-ascii-map
(let ((map (make-keymap))
(i 32))
(while (< i 128)
(define-key map (char-to-string i) 'encoded-kbd-self-insert-iso2022-7bit)
(setq i (1+ i)))
(define-key map "\e" 'encoded-kbd-iso2022-esc-prefix)
map)
"Keymap for handling non-ASCII character set in Encoded-kbd mode.")
;; One of the symbols `sjis', `iso2022-7', `iso2022-8', or `big5' to
;; denote what kind of coding-system we are now handling in
;; Encoded-kbd mode.
(defvar encoded-kbd-coding nil)
;; Keep information of designation state of ISO2022 encoding. This is
;; a vector of character sets currently designated to each graphic
;; registers (0..3).
(defvar encoded-kbd-iso2022-designations nil)
(make-variable-buffer-local 'encoded-kbd-iso2022-designations)
(put 'encoded-kbd-iso2022-designations 'permanent-local t)
;; Keep information of invocation state of ISO2022 encoding. This is
;; a vector of graphic register numbers currently invoked to each
;; graphic plane (0..1), the third element is a single shifted graphic
;; register number.
(defvar encoded-kbd-iso2022-invocations nil)
(make-variable-buffer-local 'encoded-kbd-iso2022-invocations)
(put 'encoded-kbd-iso2022-invocations 'permanent-local t)
(defun encoded-kbd-iso2022-designation ()
"Do ISO2022 designation according to the curren key in Encoded-kbd mode.
The following key sequence may cause multilingual text insertion."
(interactive)
(let ((key-seq (this-command-keys))
intermediate-char final-char
reg dimension chars charset)
(if (= (length key-seq) 4)
;; ESC $ <intermediate-char> <final-char>
(setq intermediate-char (aref key-seq 2)
dimension 2
chars (if (< intermediate-char ?,) 94 96)
final-char (aref key-seq 3)
reg (mod intermediate-char 4))
(if (= (aref key-seq 1) ?$)
;; ESC $ <final-char>
(setq dimension 2
chars 94
final-char (aref key-seq 2)
reg 0)
;; ESC <intermediate-char> <final-char>
(setq intermediate-char (aref key-seq 1)
dimension 1
chars (if (< intermediate-char ?,) 94 96)
final-char (aref key-seq 2)
reg (mod intermediate-char 4))))
(if (setq charset (iso-charset dimension chars final-char))
(aset encoded-kbd-iso2022-designations reg charset)
(error "Character set of DIMENSION %s, CHARS %s, FINAL-CHAR `%c' is not supported"
dimension chars final-char))
(if (memq (aref encoded-kbd-iso2022-designations
(aref encoded-kbd-iso2022-invocations 0))
'(ascii latin-jisx0201))
;; Graphic plane 0 (0x20..0x7f) is for ASCII. We don't have
;; to handle characters in this range specially.
(throw 'exit nil)
;; Graphic plane 0 is for non-ASCII.
(let ((overriding-local-map encoded-kbd-iso2022-non-ascii-map))
(recursive-edit)))))
(defun encoded-kbd-handle-8bit ()
"Handle an 8-bit character enterned in Encoded-kbd mode."
(interactive)
(cond ((eq encoded-kbd-coding 'iso2022-7)
(error "Can't handle the character code %d" last-command-char))
((eq encoded-kbd-coding 'iso2022-8)
(cond ((= last-command-char ?\216)
(aset encoded-kbd-iso2022-invocations 2 2))
((= last-command-char ?\217)
(aset encoded-kbd-iso2022-invocations 2 3))
((> last-command-char ?\240)
(encoded-kbd-self-insert-iso2022-8bit))
(t
(error "Can't handle the character code %d"
last-command-char))))
((eq encoded-kbd-coding 'sjis)
(encoded-kbd-self-insert-sjis))
(t
(encoded-kbd-self-insert-big5))))
(defun encoded-kbd-self-insert-iso2022-7bit ()
(interactive)
(let* ((charset (aref encoded-kbd-iso2022-designations
(or (aref encoded-kbd-iso2022-invocations 2)
(aref encoded-kbd-iso2022-invocations 0))))
(last-command-char
(if (= (charset-bytes charset) 1)
(make-char charset last-command-char)
(make-char charset last-command-char (read-char-exclusive)))))
(self-insert-command 1)
(aset encoded-kbd-iso2022-invocations 2 nil)
))
(defun encoded-kbd-self-insert-iso2022-8bit ()
(interactive)
(let* ((charset (aref encoded-kbd-iso2022-designations
(or (aref encoded-kbd-iso2022-invocations 2)
(aref encoded-kbd-iso2022-invocations 1))))
(last-command-char
(if (= (charset-bytes charset) 1)
(make-char charset last-command-char)
(make-char charset last-command-char (read-char-exclusive)))))
(self-insert-command 1)
(aset encoded-kbd-iso2022-invocations 2 nil)
))
(defun encoded-kbd-self-insert-sjis ()
(interactive)
(let ((last-command-char
(if (or (< last-command-char ?\xA0) (>= last-command-char ?\xE0))
(decode-sjis-char (+ (ash last-command-char 8)
(read-char-exclusive)))
(make-char 'latin-jisx0201 last-command-char))))
(self-insert-command 1)))
(defun encoded-kbd-self-insert-big5 ()
(interactive)
(let ((last-command-char
(decode-big5-char (+ (ash last-command-char 8)
(read-char-exclusive)))))
(self-insert-command 1)))
;;;###autoload
(defun encoded-kbd-mode (&optional arg)
"Toggle Encoded-kbd minor mode.
With arg, turn Keyboard-kbd mode on if and only if arg is positive.
When in Encoded-kbd mode, a text sent from a terminal keyboard
is accepted as a multilingual text encoded in a coding system
set by the command `encoded-kbd-set-coding-system'"
(interactive "P")
(setq encoded-kbd-mode
(if (null arg) (null encoded-kbd-mode)
(> (prefix-numeric-value arg) 0)))
(if encoded-kbd-mode
(let ((coding (keyboard-coding-system))
(input-mode (current-input-mode)))
(cond ((null coding)
(setq encoded-kbd-mode nil)
(error "No coding-system for terminal keyboard is set"))
((= (coding-system-type coding) 1) ; SJIS
(set-input-mode (nth 0 input-mode) (nth 1 input-mode)
'use-8th-bit (nth 3 input-mode))
(setq encoded-kbd-coding 'sjis))
((= (coding-system-type coding) 2) ; ISO2022
(if (aref (coding-system-flags coding) 7) ; 7-bit only
(setq encoded-kbd-coding 'iso2022-7)
(set-input-mode (nth 0 input-mode) (nth 1 input-mode)
'use-8th-bit (nth 3 input-mode))
(setq encoded-kbd-coding 'iso2022-8))
(make-variable-buffer-local 'encoded-kbd-iso2022-designations)
(setq encoded-kbd-iso2022-designations (make-vector 4 nil))
(let ((flags (coding-system-flags coding))
(i 0))
(while (< i 4)
(if (charsetp (aref flags i))
(aset encoded-kbd-iso2022-designations i
(aref flags i)))
(setq i (1+ i))))
(make-variable-buffer-local 'encoded-kbd-iso2022-invocations)
(setq encoded-kbd-iso2022-invocations (make-vector 3 nil))
(aset encoded-kbd-iso2022-invocations 0 0)
(aset encoded-kbd-iso2022-invocations 1 1))
((= (coding-system-type coding) 3) ; BIG5
(set-input-mode (nth 0 input-mode) (nth 1 input-mode)
'use-8th-bit (nth 3 input-mode))
(setq encoded-kbd-coding 'big5))
(t
(setq encoded-kbd-mode nil)
(error "Coding-system `%s' is not supported in Encoded-kbd mode"
(keyboard-coding-system))))
(setq inactivate-current-input-method-function 'encoded-kbd-mode)
(setq describe-current-input-method-function 'encoded-kbd-mode-help)
(run-hooks 'encoded-kbd-mode-hook))
(setq describe-current-input-method-function nil)
(setq current-input-method nil))
(force-mode-line-update))
;;; encoded-kb.el ends here
|
