Initial import of Calc 2.02f.

1 files changed, 159 insertions, 0 deletions

diff --git a/lisp/calc/calc-undo.el b/lisp/calc/calc-undo.el
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+;; Calculator for GNU Emacs, part II [calc-undo.el]
+;; Copyright (C) 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
+;; Written by Dave Gillespie, daveg@synaptics.com.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY.  No author or distributor
+;; accepts responsibility to anyone for the consequences of using it
+;; or for whether it serves any particular purpose or works at all,
+;; unless he says so in writing.  Refer to the GNU Emacs General Public
+;; License for full details.
+
+;; Everyone is granted permission to copy, modify and redistribute
+;; GNU Emacs, but only under the conditions described in the
+;; GNU Emacs General Public License.   A copy of this license is
+;; supposed to have been given to you along with GNU Emacs so you
+;; can know your rights and responsibilities.  It should be in a
+;; file named COPYING.  Among other things, the copyright notice
+;; and this notice must be preserved on all copies.
+
+
+
+;; This file is autoloaded from calc-ext.el.
+(require 'calc-ext)
+
+(require 'calc-macs)
+
+(defun calc-Need-calc-undo () nil)
+
+
+;;; Undo.
+
+(defun calc-undo (n)
+  (interactive "p")
+  (and calc-executing-macro
+       (error "Use C-x e, not X, to run a keyboard macro that uses Undo."))
+  (if (<= n 0)
+      (if (< n 0)
+	  (calc-redo (- n))
+	(calc-last-args 1))
+    (calc-wrapper
+     (if (null (nthcdr (1- n) calc-undo-list))
+	 (error "No further undo information available"))
+     (setq calc-undo-list
+	   (prog1
+	       (nthcdr n calc-undo-list)
+	     (let ((saved-stack-top calc-stack-top))
+	       (let ((calc-stack-top 0))
+		 (calc-handle-undos calc-undo-list n))
+	       (setq calc-stack-top saved-stack-top))))
+     (message "Undo!")))
+)
+
+(defun calc-handle-undos (cl n)
+  (if (> n 0)
+      (progn
+	(let ((old-redo calc-redo-list))
+	  (setq calc-undo-list nil)
+	  (calc-handle-undo (car cl))
+	  (setq calc-redo-list (append calc-undo-list old-redo)))
+	(calc-handle-undos (cdr cl) (1- n))))
+)
+
+(defun calc-handle-undo (list)
+  (and list
+       (let ((action (car list)))
+	 (cond
+	  ((eq (car action) 'push)
+	   (calc-pop-stack 1 (nth 1 action) t))
+	  ((eq (car action) 'pop)
+	   (calc-push-list (nth 2 action) (nth 1 action)))
+	  ((eq (car action) 'set)
+	   (calc-record-undo (list 'set (nth 1 action)
+				   (symbol-value (nth 1 action))))
+	   (set (nth 1 action) (nth 2 action)))
+	  ((eq (car action) 'store)
+	   (let ((v (intern (nth 1 action))))
+	     (calc-record-undo (list 'store (nth 1 action)
+				     (and (boundp v) (symbol-value v))))
+	     (if (y-or-n-p (format "Un-store variable %s? " (nth 1 action)))
+		 (progn
+		   (if (nth 2 action)
+		       (set v (nth 2 action))
+		     (makunbound v))
+		   (calc-refresh-evaltos v)))))
+	  ((eq (car action) 'eval)
+	   (calc-record-undo (append (list 'eval (nth 2 action) (nth 1 action))
+				     (cdr (cdr (cdr action)))))
+	   (apply (nth 1 action) (cdr (cdr (cdr action))))))
+	 (calc-handle-undo (cdr list))))
+)
+
+(defun calc-redo (n)
+  (interactive "p")
+  (and calc-executing-macro
+       (error "Use C-x e, not X, to run a keyboard macro that uses Redo."))
+  (if (<= n 0)
+      (calc-undo (- n))
+    (calc-wrapper
+     (if (null (nthcdr (1- n) calc-redo-list))
+	 (error "Unable to redo"))
+     (setq calc-redo-list
+	   (prog1
+	       (nthcdr n calc-redo-list)
+	     (let ((saved-stack-top calc-stack-top))
+	       (let ((calc-stack-top 0))
+		 (calc-handle-redos calc-redo-list n))
+	       (setq calc-stack-top saved-stack-top))))
+     (message "Redo!")))
+)
+
+(defun calc-handle-redos (cl n)
+  (if (> n 0)
+      (progn
+	(let ((old-undo calc-undo-list))
+	  (setq calc-undo-list nil)
+	  (calc-handle-undo (car cl))
+	  (setq calc-undo-list (append calc-undo-list old-undo)))
+	(calc-handle-redos (cdr cl) (1- n))))
+)
+
+(defun calc-last-args (n)
+  (interactive "p")
+  (and calc-executing-macro
+       (error "Use C-x e, not X, to run a keyboard macro that uses last-args."))
+  (calc-wrapper
+   (let ((urec (calc-find-last-x calc-undo-list n)))
+     (if urec
+	 (calc-handle-last-x urec)
+       (error "Not enough undo information available"))))
+)
+
+(defun calc-handle-last-x (list)
+  (and list
+       (let ((action (car list)))
+	 (if (eq (car action) 'pop)
+	     (calc-pop-push-record-list 0 "larg"
+					(delq 'top-of-stack (nth 2 action))))
+	 (calc-handle-last-x (cdr list))))
+)
+
+(defun calc-find-last-x (ul n)
+  (and ul
+       (if (calc-undo-does-pushes (car ul))
+	   (if (<= n 1)
+	       (car ul)
+	     (calc-find-last-x (cdr ul) (1- n)))
+	 (calc-find-last-x (cdr ul) n)))
+)
+
+(defun calc-undo-does-pushes (list)
+  (and list
+       (or (eq (car (car list)) 'pop)
+	   (calc-undo-does-pushes (cdr list))))
+)
+
+
+