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130 lines
4.1 KiB
EmacsLisp
130 lines
4.1 KiB
EmacsLisp
;;; uni-input.el --- Hex Unicode input method
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;; Copyright (C) 2001-2011 Free Software Foundation, Inc.
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;; Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
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;; National Institute of Advanced Industrial Science and Technology (AIST)
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;; Registration Number H14PRO021
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;; Author: Dave Love <fx@gnu.org>
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;; Keywords: i18n
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Provides an input method for entering characters by hex unicode in
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;; the form `uxxxx', similarly to the Yudit editor.
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;; This is not really a Quail method, but uses some Quail functions.
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;; There is probably A Better Way.
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;; You can get a similar effect by using C-q with
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;; `read-quoted-char-radix' set to 16.
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;; Note that this only allows you to enter BMP values unless someone
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;; extends it to use variable numbers of digits.
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;;; Code:
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(require 'quail)
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(defun ucs-input-insert-char (char)
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(insert char)
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(move-overlay quail-overlay (overlay-start quail-overlay) (point)))
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(defun ucs-input-method (key)
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(if (or buffer-read-only
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(and (/= key ?U) (/= key ?u)))
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(list key)
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(quail-setup-overlays nil)
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(ucs-input-insert-char key)
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(let ((modified-p (buffer-modified-p))
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(buffer-undo-list t)
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(input-method-function nil)
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(echo-keystrokes 0)
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(help-char nil)
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(events (list key))
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(str " "))
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(unwind-protect
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(catch 'non-digit
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(progn
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(dotimes (i 4)
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(let ((seq (read-key-sequence nil))
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key)
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(if (and (stringp seq)
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(= 1 (length seq))
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(setq key (aref seq 0))
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(memq key '(?0 ?1 ?2 ?3 ?4 ?5 ?6 ?7 ?8 ?9 ?a
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?b ?c ?d ?e ?f ?A ?B ?C ?D ?E ?F)))
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(progn
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(push key events)
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(ucs-input-insert-char key))
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(quail-delete-region)
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(throw 'non-digit (append (reverse events)
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(listify-key-sequence seq))))))
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(quail-delete-region)
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(let ((n (string-to-number (apply 'string
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(cdr (nreverse events)))
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16)))
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(if (characterp n)
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(list n)))))
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(quail-delete-overlays)
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(set-buffer-modified-p modified-p)
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(run-hooks 'input-method-after-insert-chunk-hook)))))
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(defun ucs-input-activate (&optional arg)
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"Activate UCS input method.
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With arg, activate UCS input method if and only if arg is positive.
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While this input method is active, the variable
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`input-method-function' is bound to the function `ucs-input-method'."
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(if (and arg
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(< (prefix-numeric-value arg) 0))
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(unwind-protect
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(progn
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(quail-hide-guidance)
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(quail-delete-overlays)
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(setq describe-current-input-method-function nil))
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(kill-local-variable 'input-method-function))
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(setq inactivate-current-input-method-function 'ucs-input-inactivate)
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(setq describe-current-input-method-function 'ucs-input-help)
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(quail-delete-overlays)
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(if (eq (selected-window) (minibuffer-window))
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(add-hook 'minibuffer-exit-hook 'quail-exit-from-minibuffer))
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(set (make-local-variable 'input-method-function)
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'ucs-input-method)))
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(defun ucs-input-inactivate ()
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"Inactivate UCS input method."
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(interactive)
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(ucs-input-activate -1))
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(defun ucs-input-help ()
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(interactive)
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(with-output-to-temp-buffer "*Help*"
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(princ "\
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Input method: ucs (mode line indicator:U+)
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Input as Unicode: U<hex> or u<hex>, where <hex> is a four-digit hex number.")))
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;; The file ../leim-ext.el contains the following call.
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;; (register-input-method "ucs" "UTF-8" 'ucs-input-activate "U+"
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;; "Unicode input as hex in the form Uxxxx.")
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(provide 'uni-input)
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;;; uni-input.el ends here
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