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|
;;; encoded-kb.el --- handler to input multibyte characters encoded somehow
;; Copyright (C) 1997, 2001, 2002, 2003, 2004, 2005, 2006, 2007
;; Free Software Foundation, Inc.
;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
;; 2005, 2006, 2007
;; National Institute of Advanced Industrial Science and Technology (AIST)
;; Registration Number H14PRO021
;; 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., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;;; Code:
;; Usually this map is empty (even if Encoded-kbd mode is on), but if
;; the keyboard coding system is iso-2022-based, it defines dummy key
;; bindings for ESC $ ..., etc. so that those bindings in
;; key-translation-map take effect.
(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)
;; 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)
(defsubst encoded-kbd-last-key ()
(let ((keys (this-single-command-keys)))
(aref keys (1- (length keys)))))
(defun encoded-kbd-iso2022-designation (ignore)
"Do ISO2022 designation according to the current key in Encoded-kbd mode.
The following key sequence may cause multilingual text insertion."
(let ((key-seq (this-single-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))))
(aset encoded-kbd-iso2022-designations reg
(iso-charset dimension chars final-char)))
"")
(defun encoded-kbd-iso2022-single-shift (ignore)
(let ((char (encoded-kbd-last-key)))
(aset encoded-kbd-iso2022-invocations 2 (if (= char ?\216) 2 3)))
"")
(defun encoded-kbd-self-insert-iso2022-7bit (ignore)
(let ((char (encoded-kbd-last-key))
(charset (aref encoded-kbd-iso2022-designations
(or (aref encoded-kbd-iso2022-invocations 2)
(aref encoded-kbd-iso2022-invocations 0)))))
(aset encoded-kbd-iso2022-invocations 2 nil)
(vector (if (= (charset-dimension charset) 1)
(make-char charset char)
(make-char charset char (read-char-exclusive))))))
(defun encoded-kbd-self-insert-iso2022-8bit (ignore)
(let ((char (encoded-kbd-last-key))
(charset (aref encoded-kbd-iso2022-designations
(or (aref encoded-kbd-iso2022-invocations 2)
(aref encoded-kbd-iso2022-invocations 1)))))
(aset encoded-kbd-iso2022-invocations 2 nil)
(vector (if (= (charset-dimension charset) 1)
(make-char charset char)
(make-char charset char (read-char-exclusive))))))
(defun encoded-kbd-self-insert-sjis (ignore)
(let ((char (encoded-kbd-last-key)))
(vector
(if (or (< char ?\xA0) (>= char ?\xE0))
(decode-sjis-char (+ (ash char 8) (read-char-exclusive)))
(make-char 'katakana-jisx0201 char)))))
(defun encoded-kbd-self-insert-big5 (ignore)
(let ((char (encoded-kbd-last-key)))
(vector
(decode-big5-char (+ (ash char 8) (read-char-exclusive))))))
(defun encoded-kbd-self-insert-ccl (ignore)
(let ((str (char-to-string (encoded-kbd-last-key)))
(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))))
(vector (aref result 0))))
(defun encoded-kbd-setup-keymap (coding)
;; At first, reset the keymap.
(define-key encoded-kbd-mode-map "\e" nil)
;; Then setup the keymap according to the keyboard coding system.
(cond
((eq (coding-system-type coding) 1) ; SJIS
(let ((i 128))
(while (< i 256)
(define-key key-translation-map
(vector i) 'encoded-kbd-self-insert-sjis)
(setq i (1+ i))))
8)
((eq (coding-system-type coding) 3) ; Big5
(let ((i 161))
(while (< i 255)
(define-key key-translation-map
(vector i) 'encoded-kbd-self-insert-big5)
(setq i (1+ i))))
8)
((eq (coding-system-type coding) 2) ; ISO-2022
(let ((flags (coding-system-flags coding))
use-designation)
(if (aref flags 8)
nil ; Don't support locking-shift.
(setq encoded-kbd-iso2022-designations (make-vector 4 nil)
encoded-kbd-iso2022-invocations (make-vector 3 nil))
(dotimes (i 4)
(if (aref flags i)
(if (charsetp (aref flags i))
(aset encoded-kbd-iso2022-designations
i (aref flags i))
(setq use-designation t)
(if (charsetp (car-safe (aref flags i)))
(aset encoded-kbd-iso2022-designations
i (car (aref flags i)))))))
(aset encoded-kbd-iso2022-invocations 0 0)
(if (aref encoded-kbd-iso2022-designations 1)
(aset encoded-kbd-iso2022-invocations 1 1))
(when use-designation
(define-key encoded-kbd-mode-map "\e" 'encoded-kbd-iso2022-esc-prefix)
(define-key key-translation-map "\e" 'encoded-kbd-iso2022-esc-prefix))
(when (or (aref flags 2) (aref flags 3))
(define-key key-translation-map
[?\216] 'encoded-kbd-iso2022-single-shift)
(define-key key-translation-map
[?\217] 'encoded-kbd-iso2022-single-shift))
(or (eq (aref flags 0) 'ascii)
(dotimes (i 96)
(define-key key-translation-map
(vector (+ 32 i)) 'encoded-kbd-self-insert-iso2022-7bit)))
(if (aref flags 7)
t
(dotimes (i 96)
(define-key key-translation-map
(vector (+ 160 i)) 'encoded-kbd-self-insert-iso2022-8bit))
8))))
((eq (coding-system-type coding) 4) ; CCL-base
(let ((valid-codes (or (coding-system-get coding 'valid-codes)
'((128 . 255))))
elt from to valid)
(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 key-translation-map
(vector from) 'encoded-kbd-self-insert-ccl))
(setq from (1+ from))))
8))
(t
nil)))
;; key-translation-map at the time Encoded-kbd mode is turned on is
;; saved here.
(defvar saved-key-translation-map nil)
;; 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 :group 'keyboard :group 'mule
(if encoded-kbd-mode
;; We are turning on Encoded-kbd mode.
(let ((coding (keyboard-coding-system))
result)
(or saved-key-translation-map
(if (keymapp key-translation-map)
(setq saved-key-translation-map
(copy-keymap key-translation-map))
(setq key-translation-map (make-sparse-keymap))))
(or saved-input-mode
(setq saved-input-mode
(current-input-mode)))
(setq result (and coding (encoded-kbd-setup-keymap coding)))
(if result
(if (eq result 8)
(set-input-mode
(nth 0 saved-input-mode)
(nth 1 saved-input-mode)
'use-8th-bit
(nth 3 saved-input-mode)))
(setq encoded-kbd-mode nil
saved-key-translation-map nil
saved-input-mode nil)
(error "Unsupported coding system in Encoded-kbd mode: %S"
coding)))
;; We are turning off Encoded-kbd mode.
(setq key-translation-map saved-key-translation-map
saved-key-translation-map nil)
(apply 'set-input-mode saved-input-mode)
(setq saved-input-mode nil)))
(provide 'encoded-kb)
;;; arch-tag: 76f0f9b3-65e7-45c3-b692-59509a87ad44
;;; encoded-kb.el ends here
|
