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emacs/lisp/international/encoded-kb.el
Stefan Monnier 813c812568 (encoded-kbd-self-insert-utf-8): Catch and recover from case when the bytes 
we thought we were reading turn out to be something else entirely, such as
latin-1 chars from quail.  See bug#396.
2008-06-15 04:43:35 +00:00

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;;; encoded-kb.el --- handler to input multibyte characters encoded somehow
;; Copyright (C) 1997, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
;; Free Software Foundation, Inc.
;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
;; 2005, 2006, 2007, 2008
;; National Institute of Advanced Industrial Science and Technology (AIST)
;; Registration Number H14PRO021
;; Copyright (C) 2003
;; National Institute of Advanced Industrial Science and Technology (AIST)
;; Registration Number H13PRO009
;; 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
;;; 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
;; input-decode-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 (coding-system-get (keyboard-coding-system) :ccl-decoder))
(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))))
;; Decode list of codes in CODE-LIST by CHARSET and return the decoded
;; characters. If CODE-LIST is too short for the dimension of
;; CHARSET, read new codes and append them to the tail of CODE-LIST.
;; Return nil if CODE-LIST can't be decoded.
(defun encoded-kbd-decode-code-list (charset code-list)
(let ((dimension (charset-dimension charset))
code)
(while (> dimension (length code-list))
(nconc code-list (list (read-char-exclusive))))
(setq code (car code-list))
(if (= dimension 1)
(decode-char charset code)
(setq code-list (cdr code-list)
code (logior (lsh code 8) (car code-list)))
(if (= dimension 2)
(decode-char charset code)
(setq code-list (cdr code-list)
code (logior (lsh code 8) (car code-list)))
(if (= dimension 3)
(decode-char charset code)
;; As Emacs can't handle full 32-bit integer, we must give a
;; cons of higher and lower 16-bit codes to decode-char.
(setq code (cons (lsh code -8)
(logior (lsh (car code-list) 8) (cadr code-list))))
(decode-char charset code))))))
(defun encoded-kbd-self-insert-charset (ignore)
(let ((charset-list
(coding-system-get (keyboard-coding-system) :charset-list))
(code-list (list (encoded-kbd-last-key)))
tail char)
(while (and charset-list (not char))
(setq char (encoded-kbd-decode-code-list (car charset-list) code-list)
charset-list (cdr charset-list)))
(if char
(vector char)
(setq unread-command-events (cdr code-list))
(vector (car code-list)))))
(defun encoded-kbd-self-insert-utf-8 (arg)
(interactive "p")
(let* ((lead (encoded-kbd-last-key))
(char lead)
len event)
(cond ((< char #xE0)
(setq len 1 char (logand char #x1F)))
((< char #xF0)
(setq len 2 char (logand char #x0F)))
((< char #xF8)
(setq len 3 char (logand char #x07)))
(t
(setq len 4 char 0)))
(while (> len 0)
(setq event (read-char-exclusive))
(if (and (>= event #x80) (< event #xc0))
;; Valid utf-8 sequence.
(setq char (logior (lsh char 6) (- event #x80))
len (1- len))
;; Invalid utf-8 sequence. Might be because Quail got involved
;; in-between and the bytes we thought we were reading were actually
;; latin-1 chars. Let's presume that `event' is the second "byte",
;; i.e. there weren't any "apprently correct" between `lead' and
;; `event': it's easy to recover in this case, and the more general
;; case seems pretty unlikely.
;; FIXME: We should really do encoded-kbd decoding before processing
;; input-methods.
(push event unread-command-events)
(setq char lead)
(setq len 0)))
(vector char)))
(defun encoded-kbd-setup-keymap (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) 'shift-jis)
(let ((i 128))
(while (< i 256)
(define-key keymap
(vector i) 'encoded-kbd-self-insert-sjis)
(setq i (1+ i))))
8)
((eq (coding-system-type coding) 'charset)
(dolist (elt (mapcar
#'(lambda (x)
(let ((dim (charset-dimension x))
(code-space (get-charset-property x :code-space)))
(cons (aref code-space (* (1- dim) 2))
(aref code-space (1+ (* (1- dim) 2))))))
(coding-system-get coding :charset-list)))
(let ((from (max (car elt) 128))
(to (cdr elt)))
(while (<= from to)
(define-key keymap
(vector from) 'encoded-kbd-self-insert-charset)
(setq from (1+ from)))))
8)
((eq (coding-system-type coding) 'iso-2022)
(let ((flags (coding-system-get coding :flags))
(designation (coding-system-get coding :designation)))
(if (memq 'locking-shift flags)
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 designation i)
(if (charsetp (aref designation i))
(aset encoded-kbd-iso2022-designations
i (aref designation i))
(if (charsetp (car-safe (aref designation i)))
(aset encoded-kbd-iso2022-designations
i (car (aref designation i)))))))
(aset encoded-kbd-iso2022-invocations 0 0)
(if (aref encoded-kbd-iso2022-designations 1)
(aset encoded-kbd-iso2022-invocations 1 1))
(when (memq 'designation flags)
(define-key encoded-kbd-mode-map "\e" 'encoded-kbd-iso2022-esc-prefix)
(define-key keymap "\e" 'encoded-kbd-iso2022-esc-prefix))
(when (or (aref designation 2) (aref designation 3))
(define-key keymap
[?\216] 'encoded-kbd-iso2022-single-shift)
(define-key keymap
[?\217] 'encoded-kbd-iso2022-single-shift))
(or (eq (aref designation 0) 'ascii)
(dotimes (i 96)
(define-key keymap
(vector (+ 32 i)) 'encoded-kbd-self-insert-iso2022-7bit)))
(if (memq '7-bit flags)
t
(dotimes (i 96)
(define-key keymap
(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)
'((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 keymap
(vector from) 'encoded-kbd-self-insert-ccl))
(setq from (1+ from))))
8))
((eq (coding-system-type coding) 'utf-8)
(let ((i #xC0))
(while (< i 256)
(define-key keymap
(vector i) 'encoded-kbd-self-insert-utf-8)
(setq i (1+ i))))
8)
(t
nil)))
;;;###autoload
(defun encoded-kbd-setup-display (display)
"Set up a `input-decode-map' for `keyboard-coding-system' on DISPLAY.
DISPLAY may be a display id, a frame, or nil for the selected frame's display."
(let ((frame (if (framep display) display (car (frames-on-display-list display)))))
(when frame
(with-selected-frame frame
;; Remove any previous encoded-kb keymap from input-decode-map.
(let ((m input-decode-map)
(child nil))
(while (keymapp m)
(if (not (equal (keymap-prompt m) "encoded-kb"))
(progn
(setq child m)
(setq m (keymap-parent m)))
;; We've found an encoded-kb map, but maybe the prompt we get
;; is really inherited from the encoded-kb map.
(let (mp)
(while (and (keymapp (setq mp (keymap-parent m)))
(equal (keymap-prompt mp) "encoded-kb"))
(setq child m)
(setq m mp))
;; (assert (equal (keymap-prompt m) "encoded-kb"))
;; (assert (eq mp (keymap-parent m)))
;; (assert (not (and (keymapp mp)
;; (equal (keymap-prompt mp) "encoded-kb"))))
;; (assert (eq m (if child
;; (keymap-parent child) input-decode-map)))
;; We can finally do the actual removal.
(if child
(set-keymap-parent child mp)
(setq input-decode-map mp))
(setq m mp))))))
(if (keyboard-coding-system)
;; We are turning on Encoded-kbd mode.
(let ((coding (keyboard-coding-system))
(keymap (make-sparse-keymap "encoded-kb"))
(cim (current-input-mode))
result)
;; Place `keymap' as the immediate parent of input-decode-map
;; rather than on top, so that later `define-key' on
;; input-decode-map don't end up accidentally changing our
;; part of the keymap, which would lead to bugs when/if we later
;; on remove that part.
(set-keymap-parent keymap (keymap-parent input-decode-map))
(set-keymap-parent input-decode-map keymap)
(unless (terminal-parameter nil 'encoded-kbd-saved-input-meta-mode)
(set-terminal-parameter nil 'encoded-kbd-saved-input-mode
(nth 2 cim)))
(setq result (and coding (encoded-kbd-setup-keymap keymap coding)))
(if result
(when (and (eq result 8)
(memq (nth 2 cim) '(t nil)))
(set-input-meta-mode 'use-8th-bit))
(set-terminal-parameter
nil 'encoded-kbd-saved-input-meta-mode nil)
(error "Unsupported coding system in Encoded-kbd mode: %S"
coding)))
;; We are turning off Encoded-kbd mode.
(let ((old (terminal-parameter nil 'encoded-kbd-saved-input-meta-mode)))
(when (and old (not (equal (nth 2 (current-input-mode)) old)))
(set-input-meta-mode old))
(set-terminal-parameter
nil 'encoded-kbd-saved-input-meta-mode nil))))))
(provide 'encoded-kb)
;; arch-tag: 76f0f9b3-65e7-45c3-b692-59509a87ad44
;;; encoded-kb.el ends here
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