lisp/international/encoded-kb.el

   1 ;;; encoded-kb.el --- handler to input multibyte characters encoded somehow
   2
   3 ;; Copyright (C) 1997, 2001, 2002, 2003, 2004, 2005, 2006
   4 ;;   Free Software Foundation, Inc.
   5 ;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   6 ;;   2005, 2006
   7 ;;   National Institute of Advanced Industrial Science and Technology (AIST)
   8 ;;   Registration Number H14PRO021
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software; you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation; either version 2, or (at your option)
  15 ;; any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  24 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  25 ;; Boston, MA 02110-1301, USA.
  26
  27 ;;; Commentary:
  28
  29 ;;; Code:
  30
  31 ;; Usually this map is empty (even if Encoded-kbd mode is on), but if
  32 ;; the keyboard coding system is iso-2022-based, it defines dummy key
  33 ;; bindings for ESC $ ..., etc. so that those bindings in
  34 ;; key-translation-map take effect.
  35 (defconst encoded-kbd-mode-map (make-sparse-keymap)
  36   "Keymap for Encoded-kbd minor mode.")
  37
  38 ;; Subsidiary keymaps for handling ISO2022 escape sequences.
  39
  40 (defvar encoded-kbd-iso2022-esc-map
  41   (let ((map (make-sparse-keymap)))
  42     (define-key map "$" 'encoded-kbd-iso2022-esc-dollar-prefix)
  43     (define-key map "(" 'encoded-kbd-iso2022-designation-prefix)
  44     (define-key map ")" 'encoded-kbd-iso2022-designation-prefix)
  45     (define-key map "," 'encoded-kbd-iso2022-designation-prefix)
  46     (define-key map "-" 'encoded-kbd-iso2022-designation-prefix)
  47     map)
  48   "Keymap for handling ESC code in Encoded-kbd mode.")
  49 (fset 'encoded-kbd-iso2022-esc-prefix encoded-kbd-iso2022-esc-map)
  50
  51 (defvar encoded-kbd-iso2022-esc-dollar-map
  52   (let ((map (make-sparse-keymap)))
  53     (define-key map "(" 'encoded-kbd-iso2022-designation-prefix)
  54     (define-key map ")" 'encoded-kbd-iso2022-designation-prefix)
  55     (define-key map "," 'encoded-kbd-iso2022-designation-prefix)
  56     (define-key map "-" 'encoded-kbd-iso2022-designation-prefix)
  57     (define-key map "@" 'encoded-kbd-iso2022-designation)
  58     (define-key map "A" 'encoded-kbd-iso2022-designation)
  59     (define-key map "B" 'encoded-kbd-iso2022-designation)
  60     map)
  61   "Keymap for handling ESC $ sequence in Encoded-kbd mode.")
  62 (fset 'encoded-kbd-iso2022-esc-dollar-prefix
  63       encoded-kbd-iso2022-esc-dollar-map)
  64
  65 (defvar encoded-kbd-iso2022-designation-map
  66   (let ((map (make-sparse-keymap))
  67         (l charset-list)
  68         final-char)
  69     (while l
  70       (setq final-char (charset-iso-final-char (car l)))
  71       (if (> final-char 0)
  72           (define-key map (char-to-string final-char)
  73             'encoded-kbd-iso2022-designation))
  74       (setq l (cdr l)))
  75     map)
  76   "Keymap for handling ISO2022 designation sequence in Encoded-kbd mode.")
  77 (fset 'encoded-kbd-iso2022-designation-prefix
  78       encoded-kbd-iso2022-designation-map)
  79
  80 ;; Keep information of designation state of ISO2022 encoding.  When
  81 ;; Encoded-kbd mode is on, this is set to a vector of length 4, the
  82 ;; elements are character sets currently designated to graphic
  83 ;; registers 0 thru 3.
  84
  85 (defvar encoded-kbd-iso2022-designations nil)
  86 (put 'encoded-kbd-iso2022-designations 'permanent-local t)
  87
  88 ;; Keep information of invocation state of ISO2022 encoding.  When
  89 ;; Encoded-kbd mode is on, this is set to a vector of length 3,
  90 ;; graphic register numbers currently invoked to graphic plane 1 and
  91 ;; 2, and a single shifted graphic register number.
  92
  93 (defvar encoded-kbd-iso2022-invocations nil)
  94 (put 'encoded-kbd-iso2022-invocations 'permanent-local t)
  95
  96 (defsubst encoded-kbd-last-key ()
  97   (let ((keys (this-single-command-keys)))
  98     (aref keys (1- (length keys)))))
  99
 100 (defun encoded-kbd-iso2022-designation (ignore)
 101   "Do ISO2022 designation according to the current key in Encoded-kbd mode.
 102 The following key sequence may cause multilingual text insertion."
 103   (let ((key-seq (this-single-command-keys))
 104         (prev-g0-charset (aref encoded-kbd-iso2022-designations
 105                                (aref encoded-kbd-iso2022-invocations 0)))
 106         intermediate-char final-char
 107         reg dimension chars charset)
 108     (if (= (length key-seq) 4)
 109         ;; ESC $ <intermediate-char> <final-char>
 110         (setq intermediate-char (aref key-seq 2)
 111               dimension 2
 112               chars (if (< intermediate-char ?,) 94 96)
 113               final-char (aref key-seq 3)
 114               reg (mod intermediate-char 4))
 115       (if (= (aref key-seq 1) ?$)
 116           ;; ESC $ <final-char>
 117           (setq dimension 2
 118                 chars 94
 119                 final-char (aref key-seq 2)
 120                 reg 0)
 121         ;; ESC <intermediate-char> <final-char>
 122         (setq intermediate-char (aref key-seq 1)
 123               dimension 1
 124               chars (if (< intermediate-char ?,) 94 96)
 125               final-char (aref key-seq 2)
 126               reg (mod intermediate-char 4))))
 127     (aset encoded-kbd-iso2022-designations reg
 128           (iso-charset dimension chars final-char)))
 129   "")
 130
 131 (defun encoded-kbd-iso2022-single-shift (ignore)
 132   (let ((char (encoded-kbd-last-key)))
 133     (aset encoded-kbd-iso2022-invocations 2 (if (= char ?\216) 2 3)))
 134   "")
 135
 136 (defun encoded-kbd-self-insert-iso2022-7bit (ignore)
 137   (let ((char (encoded-kbd-last-key))
 138         (charset (aref encoded-kbd-iso2022-designations
 139                        (or (aref encoded-kbd-iso2022-invocations 2)
 140                            (aref encoded-kbd-iso2022-invocations 0)))))
 141     (aset encoded-kbd-iso2022-invocations 2 nil)
 142     (vector (if (= (charset-dimension charset) 1)
 143                 (make-char charset char)
 144               (make-char charset char (read-char-exclusive))))))
 145
 146 (defun encoded-kbd-self-insert-iso2022-8bit (ignore)
 147   (let ((char (encoded-kbd-last-key))
 148         (charset (aref encoded-kbd-iso2022-designations
 149                        (or (aref encoded-kbd-iso2022-invocations 2)
 150                            (aref encoded-kbd-iso2022-invocations 1)))))
 151     (aset encoded-kbd-iso2022-invocations 2 nil)
 152     (vector (if (= (charset-dimension charset) 1)
 153                 (make-char charset char)
 154               (make-char charset char (read-char-exclusive))))))
 155
 156 (defun encoded-kbd-self-insert-sjis (ignore)
 157   (let ((char (encoded-kbd-last-key)))
 158     (vector
 159      (if (or (< char ?\xA0) (>= char ?\xE0))
 160          (decode-sjis-char (+ (ash char 8) (read-char-exclusive)))
 161        (make-char 'katakana-jisx0201 char)))))
 162
 163 (defun encoded-kbd-self-insert-big5 (ignore)
 164   (let ((char (encoded-kbd-last-key)))
 165     (vector
 166      (decode-big5-char (+ (ash char 8) (read-char-exclusive))))))
 167
 168 (defun encoded-kbd-self-insert-ccl (ignore)
 169   (let ((str (char-to-string (encoded-kbd-last-key)))
 170         (ccl (car (aref (coding-system-spec (keyboard-coding-system)) 4)))
 171         (vec [nil nil nil nil nil nil nil nil nil])
 172         result)
 173     (while (= (length (setq result (ccl-execute-on-string ccl vec str t))) 0)
 174       (dotimes (i 9) (aset vec i nil))
 175       (setq str (format "%s%c" str (read-char-exclusive))))
 176     (vector (aref result 0))))
 177
 178 (defun encoded-kbd-setup-keymap (coding)
 179   ;; At first, reset the keymap.
 180   (define-key encoded-kbd-mode-map "\e" nil)
 181   ;; Then setup the keymap according to the keyboard coding system.
 182   (cond
 183    ((eq (coding-system-type coding) 1)  ; SJIS
 184     (let ((i 128))
 185       (while (< i 256)
 186         (define-key key-translation-map
 187           (vector i) 'encoded-kbd-self-insert-sjis)
 188         (setq i (1+ i))))
 189     8)
 190
 191    ((eq (coding-system-type coding) 3)  ; Big5
 192     (let ((i 161))
 193       (while (< i 255)
 194         (define-key key-translation-map
 195           (vector i) 'encoded-kbd-self-insert-big5)
 196         (setq i (1+ i))))
 197     8)
 198
 199    ((eq (coding-system-type coding) 2) ; ISO-2022
 200     (let ((flags (coding-system-flags coding))
 201           use-designation)
 202       (if (aref flags 8)
 203           nil                           ; Don't support locking-shift.
 204         (setq encoded-kbd-iso2022-designations (make-vector 4 nil)
 205               encoded-kbd-iso2022-invocations (make-vector 3 nil))
 206         (dotimes (i 4)
 207           (if (aref flags i)
 208               (if (charsetp (aref flags i))
 209                   (aset encoded-kbd-iso2022-designations
 210                         i (aref flags i))
 211                 (setq use-designation t)
 212                 (if (charsetp (car-safe (aref flags i)))
 213                     (aset encoded-kbd-iso2022-designations
 214                           i (car (aref flags i)))))))
 215         (aset encoded-kbd-iso2022-invocations 0 0)
 216         (if (aref encoded-kbd-iso2022-designations 1)
 217             (aset encoded-kbd-iso2022-invocations 1 1))
 218         (when use-designation
 219           (define-key encoded-kbd-mode-map "\e" 'encoded-kbd-iso2022-esc-prefix)
 220           (define-key key-translation-map "\e" 'encoded-kbd-iso2022-esc-prefix))
 221         (when (or (aref flags 2) (aref flags 3))
 222           (define-key key-translation-map
 223             [?\216] 'encoded-kbd-iso2022-single-shift)
 224           (define-key key-translation-map
 225             [?\217] 'encoded-kbd-iso2022-single-shift))
 226         (or (eq (aref flags 0) 'ascii)
 227             (dotimes (i 96)
 228               (define-key key-translation-map
 229                 (vector (+ 32 i)) 'encoded-kbd-self-insert-iso2022-7bit)))
 230         (if (aref flags 7)
 231             t
 232           (dotimes (i 96)
 233             (define-key key-translation-map
 234               (vector (+ 160 i)) 'encoded-kbd-self-insert-iso2022-8bit))
 235           8))))
 236
 237    ((eq (coding-system-type coding) 4)  ; CCL-base
 238     (let ((valid-codes (or (coding-system-get coding 'valid-codes)
 239                            '((128 . 255))))
 240           elt from to valid)
 241       (while valid-codes
 242         (setq elt (car valid-codes) valid-codes (cdr valid-codes))
 243         (if (consp elt)
 244             (setq from (car elt) to (cdr elt))
 245           (setq from (setq to elt)))
 246         (while (<= from to)
 247           (if (>= from 128)
 248               (define-key key-translation-map
 249                 (vector from) 'encoded-kbd-self-insert-ccl))
 250           (setq from (1+ from))))
 251       8))
 252
 253    (t
 254     nil)))
 255
 256 ;; key-translation-map at the time Encoded-kbd mode is turned on is
 257 ;; saved here.
 258 (defvar saved-key-translation-map nil)
 259
 260 ;; Input mode at the time Encoded-kbd mode is turned on is saved here.
 261 (defvar saved-input-mode nil)
 262
 263 (put 'encoded-kbd-mode 'permanent-local t)
 264 ;;;###autoload
 265 (define-minor-mode encoded-kbd-mode
 266   "Toggle Encoded-kbd minor mode.
 267 With arg, turn Encoded-kbd mode on if and only if arg is positive.
 268
 269 You should not turn this mode on manually, instead use the command
 270 \\[set-keyboard-coding-system] which turns on or off this mode
 271 automatically.
 272
 273 In Encoded-kbd mode, a text sent from keyboard is accepted
 274 as a multilingual text encoded in a coding system set by
 275 \\[set-keyboard-coding-system]."
 276   :global t :group 'keyboard :group 'mule
 277
 278   (if encoded-kbd-mode
 279       ;; We are turning on Encoded-kbd mode.
 280       (let ((coding (keyboard-coding-system))
 281             result)
 282         (or saved-key-translation-map
 283             (if (keymapp key-translation-map)
 284                 (setq saved-key-translation-map
 285                       (copy-keymap key-translation-map))
 286               (setq key-translation-map (make-sparse-keymap))))
 287         (or saved-input-mode
 288             (setq saved-input-mode
 289                   (current-input-mode)))
 290         (setq result (and coding (encoded-kbd-setup-keymap coding)))
 291         (if result
 292             (if (eq result 8)
 293                 (set-input-mode
 294                  (nth 0 saved-input-mode)
 295                  (nth 1 saved-input-mode)
 296                  'use-8th-bit
 297                  (nth 3 saved-input-mode)))
 298           (setq encoded-kbd-mode nil
 299                 saved-key-translation-map nil
 300                 saved-input-mode nil)
 301           (error "Unsupported coding system in Encoded-kbd mode: %S"
 302                  coding)))
 303
 304     ;; We are turning off Encoded-kbd mode.
 305     (setq key-translation-map saved-key-translation-map
 306           saved-key-translation-map nil)
 307     (apply 'set-input-mode saved-input-mode)
 308     (setq saved-input-mode nil)))
 309
 310 (provide 'encoded-kb)
 311
 312 ;;; arch-tag: 76f0f9b3-65e7-45c3-b692-59509a87ad44
 313 ;;; encoded-kb.el ends here