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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.
;;; Commentary:
;;; Code:
(defconst encoded-kbd-mode-map (make-sparse-keymap)
"Keymap for Encoded-kbd minor mode.")
;; 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)
final-char)
(while l
(setq final-char (charset-iso-final-char (car l)))
(if (> final-char 0)
(define-key map (char-to-string final-char)
'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)
(setq i 160)
(while (< i 256)
(define-key map (vector i) 'encoded-kbd-handle-8bit)
(setq i (1+ i)))
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. When
;; Encoded-kbd mode is on, this is set to a vector of length 4, the
;; elements are character sets currently designated to graphic
;; registers 0 thru 3.
(defvar encoded-kbd-iso2022-designations nil)
(put 'encoded-kbd-iso2022-designations 'permanent-local t)
;; Keep information of invocation state of ISO2022 encoding. When
;; Encoded-kbd mode is on, this is set to a vector of length 3,
;; graphic register numbers currently invoked to graphic plane 1 and
;; 2, and a single shifted graphic register number.
(defvar encoded-kbd-iso2022-invocations nil)
(put 'encoded-kbd-iso2022-invocations 'permanent-local t)
(defun encoded-kbd-iso2022-designation ()
"Do ISO2022 designation according to the current key in Encoded-kbd mode.
The following key sequence may cause multilingual text insertion."
(interactive)
(let ((key-seq (this-command-keys))
(prev-g0-charset (aref encoded-kbd-iso2022-designations
(aref encoded-kbd-iso2022-invocations 0)))
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.
(if (not (memq prev-g0-charset '(ascii latin-jisx0201)))
;; We must exit recursive edit now.
(throw 'exit nil))
;; Graphic plane 0 is for non-ASCII.
(if (memq prev-g0-charset '(ascii latin-jisx0201))
;; We must handle keys specially.
(let ((overriding-local-map encoded-kbd-iso2022-non-ascii-map))
(recursive-edit))))))
(defun encoded-kbd-handle-8bit ()
"Handle an 8-bit character entered 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))))
(char (if (= (charset-dimension charset) 1)
(make-char charset last-command-char)
(make-char charset last-command-char (read-char-exclusive)))))
(aset encoded-kbd-iso2022-invocations 2 nil)
(setq unread-command-events (cons char unread-command-events))))
(defun encoded-kbd-self-insert-iso2022-8bit ()
(interactive)
(cond
((= last-command-char ?\216) ; SS2 (Single Shift 2)
(aset encoded-kbd-iso2022-invocations 2 2))
((= last-command-char ?\217) ; SS3 (Single Shift 3)
(aset encoded-kbd-iso2022-invocations 2 3))
(t
(let* ((charset (aref encoded-kbd-iso2022-designations
(or (aref encoded-kbd-iso2022-invocations 2)
(aref encoded-kbd-iso2022-invocations 1))))
(char (if (= (charset-dimension charset) 1)
(make-char charset last-command-char)
(make-char charset last-command-char
(read-char-exclusive)))))
(aset encoded-kbd-iso2022-invocations 2 nil)
(setq unread-command-events (cons char unread-command-events))))))
(defun encoded-kbd-self-insert-sjis ()
(interactive)
(let ((char (if (or (< last-command-char ?\xA0) (>= last-command-char ?\xE0))
(decode-sjis-char (+ (ash last-command-char 8)
(read-char-exclusive)))
(make-char 'katakana-jisx0201 last-command-char))))
(setq unread-command-events (cons char unread-command-events))))
(defun encoded-kbd-self-insert-big5 ()
(interactive)
(let ((char (decode-big5-char (+ (ash last-command-char 8)
(read-char-exclusive)))))
(setq unread-command-events (cons char unread-command-events))))
(defun encoded-kbd-self-insert-ccl ()
(interactive)
(let ((str (char-to-string last-command-char))
(ccl (car (aref (coding-system-spec (keyboard-coding-system)) 4)))
(vec [nil nil nil nil nil nil nil nil nil])
result)
(while (= (length (setq result (ccl-execute-on-string ccl vec str t))) 0)
(dotimes (i 9) (aset vec i nil))
(setq str (format "%s%c" str (read-char-exclusive))))
(setq unread-command-events
(append result unread-command-events))))
(defun encoded-kbd-setup-keymap (coding)
;; At first, reset the keymap.
(setcdr encoded-kbd-mode-map nil)
;; Then setup the keymap according to the keyboard coding system.
(cond
((eq encoded-kbd-coding 'sjis)
(let ((i 128))
(while (< i 256)
(define-key encoded-kbd-mode-map
(vector i) 'encoded-kbd-self-insert-sjis)
(setq i (1+ i)))))
((eq encoded-kbd-coding 'big5)
(let ((i 161))
(while (< i 255)
(define-key encoded-kbd-mode-map
(vector i) 'encoded-kbd-self-insert-big5)
(setq i (1+ i)))))
((eq encoded-kbd-coding 'iso2022-7)
(define-key encoded-kbd-mode-map "\e" 'encoded-kbd-iso2022-esc-prefix))
((eq encoded-kbd-coding 'iso2022-8)
(define-key encoded-kbd-mode-map
(vector ?\216) 'encoded-kbd-self-insert-iso2022-8bit)
(define-key encoded-kbd-mode-map
(vector ?\217) 'encoded-kbd-self-insert-iso2022-8bit)
(let ((i 160))
(while (< i 256)
(define-key encoded-kbd-mode-map
(vector i) 'encoded-kbd-self-insert-iso2022-8bit)
(setq i (1+ i)))))
((eq encoded-kbd-coding 'ccl)
(let ((valid-codes (or (coding-system-get coding 'valid-codes)
'((128 . 255))))
elt from to)
(while valid-codes
(setq elt (car valid-codes) valid-codes (cdr valid-codes))
(if (consp elt)
(setq from (car elt) to (cdr elt))
(setq from (setq to elt)))
(while (<= from to)
(if (>= from 128)
(define-key encoded-kbd-mode-map
(vector from) 'encoded-kbd-self-insert-ccl))
(setq from (1+ from))))))
(t
(error "Invalid value in encoded-kbd-coding: %s" encoded-kbd-coding))))
;; Input mode at the time Encoded-kbd mode is turned on is saved here.
(defvar saved-input-mode nil)
(put 'encoded-kbd-mode 'permanent-local t)
;;;###autoload
(define-minor-mode encoded-kbd-mode
"Toggle Encoded-kbd minor mode.
With arg, turn Encoded-kbd mode on if and only if arg is positive.
You should not turn this mode on manually, instead use the command
\\[set-keyboard-coding-system] which turns on or off this mode
automatically.
In Encoded-kbd mode, a text sent from keyboard is accepted
as a multilingual text encoded in a coding system set by
\\[set-keyboard-coding-system]."
:global t
;; We must at first reset input-mode to the original.
(if saved-input-mode (apply 'set-input-mode saved-input-mode))
(if encoded-kbd-mode
(let ((coding (keyboard-coding-system)))
(setq saved-input-mode (current-input-mode))
(cond ((null coding)
(setq encoded-kbd-mode nil)
(error "No coding system for keyboard input is set"))
((= (coding-system-type coding) 1) ; SJIS
(set-input-mode
(nth 0 saved-input-mode) (nth 1 saved-input-mode)
'use-8th-bit (nth 3 saved-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 saved-input-mode) (nth 1 saved-input-mode)
'use-8th-bit (nth 3 saved-input-mode))
(setq encoded-kbd-coding 'iso2022-8))
(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))
(if (charsetp (car-safe (aref flags i)))
(aset encoded-kbd-iso2022-designations i
(car (aref flags i)))))
(setq i (1+ i))))
(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 saved-input-mode) (nth 1 saved-input-mode)
'use-8th-bit (nth 3 saved-input-mode))
(setq encoded-kbd-coding 'big5))
((= (coding-system-type coding) 4) ; CCL based coding
(set-input-mode
(nth 0 saved-input-mode) (nth 1 saved-input-mode)
'use-8th-bit (nth 3 saved-input-mode))
(setq encoded-kbd-coding 'ccl))
(t
(setq encoded-kbd-mode nil)
(error "Coding-system `%s' is not supported in Encoded-kbd mode"
(keyboard-coding-system))))
(encoded-kbd-setup-keymap coding))))
(provide 'encoded-kb)
;;; arch-tag: 76f0f9b3-65e7-45c3-b692-59509a87ad44
;;; encoded-kb.el ends here
|
