* emacs-lisp/lucid.el: Move to obsolete/lucid.el.

* emacs-lisp/levents.el: Move to obsolete/levents.el.

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+;;; levents.el --- emulate the Lucid event data type and associated functions
+
+;; Copyright (C) 1993, 2001, 2002, 2003, 2004,
+;;   2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+
+;; Maintainer: FSF
+;; Keywords: emulations
+;; Obsolete-since: 23.2
+
+;; 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:
+
+;; Things we cannot emulate in Lisp:
+;; It is not possible to emulate current-mouse-event as a variable,
+;; though it is not hard to obtain the data from (this-command-keys).
+
+;; We do not have a variable unread-command-event;
+;; instead, we have the more general unread-command-events.
+
+;; Our read-key-sequence and read-char are not precisely
+;; compatible with those in Lucid Emacs, but they should work ok.
+
+;;; Code:
+
+(defun next-command-event (event)
+  (error "You must rewrite to use `read-command-event' instead of `next-command-event'"))
+
+(defun next-event (event)
+  (error "You must rewrite to use `read-event' instead of `next-event'"))
+
+(defun dispatch-event (event)
+  (error "`dispatch-event' not supported"))
+
+;; Make events of type eval, menu and timeout
+;; execute properly.
+
+(define-key global-map [menu] 'execute-eval-event)
+(define-key global-map [timeout] 'execute-eval-event)
+(define-key global-map [eval] 'execute-eval-event)
+
+(defun execute-eval-event (event)
+  (interactive "e")
+  (funcall (nth 1 event) (nth 2 event)))
+
+(put 'eval 'event-symbol-elements '(eval))
+(put 'menu 'event-symbol-elements '(eval))
+(put 'timeout 'event-symbol-elements '(eval))
+
+(defun allocate-event ()
+  "Returns an empty event structure.
+In this emulation, it returns nil."
+  nil)
+
+(defun button-press-event-p (obj)
+  "True if the argument is a mouse-button-press event object."
+  (and (consp obj) (symbolp (car obj))
+       (memq 'down (get (car obj) 'event-symbol-elements))))
+
+(defun button-release-event-p (obj)
+  "True if the argument is a mouse-button-release event object."
+  (and (consp obj) (symbolp (car obj))
+       (or (memq 'click (get (car obj) 'event-symbol-elements))
+	   (memq 'drag (get (car obj) 'event-symbol-elements)))))
+
+(defun button-event-p (obj)
+  "True if the argument is a mouse-button press or release event object."
+  (and (consp obj) (symbolp (car obj))
+       (or (memq 'click (get (car obj) 'event-symbol-elements))
+	   (memq 'down (get (car obj) 'event-symbol-elements))
+	   (memq 'drag (get (car obj) 'event-symbol-elements)))))
+
+(defun mouse-event-p (obj)
+  "True if the argument is a mouse-button press or release event object."
+  (and (consp obj) (symbolp (car obj))
+       (or (eq (car obj) 'mouse-movement)
+	   (memq 'click (get (car obj) 'event-symbol-elements))
+	   (memq 'down (get (car obj) 'event-symbol-elements))
+	   (memq 'drag (get (car obj) 'event-symbol-elements)))))
+
+(defun character-to-event (ch &optional event)
+  "Converts a numeric ASCII value to an event structure, replete with
+bucky bits.  The character is the first argument, and the event to fill
+in is the second.  This function contains knowledge about what the codes
+mean -- for example, the number 9 is converted to the character Tab,
+not the distinct character Control-I.
+
+Beware that character-to-event and event-to-character are not strictly
+inverse functions, since events contain much more information than the
+ASCII character set can encode."
+  ch)
+
+(defun copy-event (event1 &optional event2)
+  "Make a copy of the given event object.
+In this emulation, `copy-event' just returns its argument."
+  event1)
+
+(defun deallocate-event (event)
+  "Allow the given event structure to be reused.
+In actual Lucid Emacs, you MUST NOT use this event object after
+calling this function with it.  You will lose.  It is not necessary to
+call this function, as event objects are garbage- collected like all
+other objects; however, it may be more efficient to explicitly
+deallocate events when you are sure that that is safe.
+
+This emulation does not actually deallocate or reuse events
+except via garbage collection and `cons'."
+  nil)
+
+(defun enqueue-eval-event: (function object)
+  "Add an eval event to the back of the queue.
+It will be the next event read after all pending events."
+  (setq unread-command-events
+	(nconc unread-command-events
+	       (list (list 'eval function object)))))
+
+(defun eval-event-p (obj)
+  "True if the argument is an eval or menu event object."
+  (eq (car-safe obj) 'eval))
+
+(defun event-button (event)
+  "Return the button-number of the given mouse-button-press event."
+  (let ((sym (car (get (car event) 'event-symbol-elements))))
+    (cdr (assq sym '((mouse-1 . 1) (mouse-2 . 2) (mouse-3 . 3)
+		     (mouse-4 . 4) (mouse-5 . 5))))))
+
+(defun event-function (event)
+  "Return the callback function of the given timeout, menu, or eval event."
+  (nth 1 event))
+
+(defun event-key (event)
+  "Returns the KeySym of the given key-press event.
+The value is an ASCII printing character (not upper case) or a symbol."
+  (if (symbolp event)
+      (car (get event 'event-symbol-elements))
+    (let ((base (logand event (1- (lsh 1 18)))))
+      (downcase (if (< base 32) (logior base 64) base)))))
+
+(defun event-object (event)
+  "Returns the function argument of the given timeout, menu, or eval event."
+  (nth 2 event))
+
+(defun event-point (event)
+  "Returns the character position of the given mouse-related event.
+If the event did not occur over a window, or did
+not occur over text, then this returns nil.  Otherwise, it returns an index
+into the buffer visible in the event's window."
+  (posn-point (event-end event)))
+
+;; Return position of start of line LINE in WINDOW.
+;; If LINE is nil, return the last position
+;; visible in WINDOW.
+(defun event-closest-point-1 (window &optional line)
+  (let* ((total (- (window-height window)
+		   (if (window-minibuffer-p window)
+		       0 1)))
+	 (distance (or line total)))
+    (save-excursion
+      (goto-char (window-start window))
+      (if (= (vertical-motion distance) distance)
+	  (if (not line)
+	      (forward-char -1)))
+      (point))))
+
+(defun event-closest-point (event &optional start-window)
+  "Return the nearest position to where EVENT ended its motion.
+This is computed for the window where EVENT's motion started,
+or for window WINDOW if that is specified."
+  (or start-window (setq start-window (posn-window (event-start event))))
+  (if (eq start-window (posn-window (event-end event)))
+      (if (eq (event-point event) 'vertical-line)
+	  (event-closest-point-1 start-window
+				 (cdr (posn-col-row (event-end event))))
+	(if (eq (event-point event) 'mode-line)
+	    (event-closest-point-1 start-window)
+	  (event-point event)))
+    ;; EVENT ended in some other window.
+    (let* ((end-w (posn-window (event-end event)))
+	   (end-w-top)
+	   (w-top (nth 1 (window-edges start-window))))
+      (setq end-w-top
+	    (if (windowp end-w)
+		(nth 1 (window-edges end-w))
+	      (/ (cdr (posn-x-y (event-end event)))
+		 (frame-char-height end-w))))
+      (if (>= end-w-top w-top)
+	  (event-closest-point-1 start-window)
+	(window-start start-window)))))
+
+(defun event-process (event)
+  "Returns the process of the given process-output event."
+  (nth 1 event))
+
+(defun event-timestamp (event)
+  "Returns the timestamp of the given event object.
+In Lucid Emacs, this works for any kind of event.
+In this emulation, it returns nil for non-mouse-related events."
+  (and (listp event)
+       (posn-timestamp (event-end event))))
+
+(defun event-to-character (event &optional lenient)
+  "Returns the closest ASCII approximation to the given event object.
+If the event isn't a keypress, this returns nil.
+If the second argument is non-nil, then this is lenient in its
+translation; it will ignore modifier keys other than control and meta,
+and will ignore the shift modifier on those characters which have no
+shifted ASCII equivalent (Control-Shift-A for example, will be mapped to
+the same ASCII code as Control-A.)  If the second arg is nil, then nil
+will be returned for events which have no direct ASCII equivalent."
+  (if (symbolp event)
+      (and lenient
+	   (cdr (assq event '((backspace . 8) (delete . 127) (tab . 9)
+			      (return . 10) (enter . 10)))))
+    ;; Our interpretation is, ASCII means anything a number can represent.
+    (if (integerp event)
+	event nil)))
+
+(defun event-window (event)
+  "Returns the window of the given mouse-related event object."
+  (posn-window (event-end event)))
+
+(defun event-x (event)
+  "Returns the X position in characters of the given mouse-related event."
+  (/ (car (posn-col-row (event-end event)))
+     (frame-char-width (window-frame (event-window event)))))
+
+(defun event-x-pixel (event)
+  "Returns the X position in pixels of the given mouse-related event."
+  (car (posn-col-row (event-end event))))
+
+(defun event-y (event)
+  "Returns the Y position in characters of the given mouse-related event."
+  (/ (cdr (posn-col-row (event-end event)))
+     (frame-char-height (window-frame (event-window event)))))
+
+(defun event-y-pixel (event)
+  "Returns the Y position in pixels of the given mouse-related event."
+  (cdr (posn-col-row (event-end event))))
+
+(defun key-press-event-p (obj)
+  "True if the argument is a keyboard event object."
+  (or (integerp obj)
+      (and (symbolp obj)
+	   (get obj 'event-symbol-elements))))
+
+(defun menu-event-p (obj)
+  "True if the argument is a menu event object."
+  (eq (car-safe obj) 'menu))
+
+(defun motion-event-p (obj)
+  "True if the argument is a mouse-motion event object."
+  (eq (car-safe obj) 'mouse-movement))
+
+(defun read-command-event ()
+  "Return the next keyboard or mouse event; execute other events.
+This is similar to the function `next-command-event' of Lucid Emacs,
+but different in that it returns the event rather than filling in
+an existing event object."
+  (let (event)
+    (while (progn
+	     (setq event (read-event))
+	     (not (or (key-press-event-p event)
+		      (button-press-event-p event)
+		      (button-release-event-p event)
+		      (menu-event-p event))))
+      (let ((type (car-safe event)))
+	(cond ((eq type 'eval)
+	       (funcall (nth 1 event) (nth 2 event)))
+	      ((eq type 'switch-frame)
+	       (select-frame (nth 1 event))))))
+    event))
+
+(defun process-event-p (obj)
+  "True if the argument is a process-output event object.
+GNU Emacs 19 does not currently generate process-output events."
+  (eq (car-safe obj) 'process))
+
+(provide 'levents)
+
+;; arch-tag: a80c21da-69d7-46de-9cdb-5f68577b5525
+;;; levents.el ends here