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+;; Calculator for GNU Emacs, part II [calc-yank.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-yank () nil)
+
+
+;;; Kill ring commands.
+
+(defun calc-kill (nn &optional no-delete)
+  (interactive "P")
+  (if (eq major-mode 'calc-mode)
+      (calc-wrapper
+       (calc-force-refresh)
+       (calc-set-command-flag 'no-align)
+       (let ((num (max (calc-locate-cursor-element (point)) 1))
+	     (n (prefix-numeric-value nn)))
+	 (if (< n 0)
+	     (progn
+	       (if (eobp)
+		   (setq num (1- num)))
+	       (setq num (- num n)
+		     n (- n))))
+	 (let ((stuff (calc-top-list n (- num n -1))))
+	   (calc-cursor-stack-index num)
+	   (let ((first (point)))
+	     (calc-cursor-stack-index (- num n))
+	     (if (null nn)
+		 (backward-char 1))   ; don't include newline for raw C-k
+	     (copy-region-as-kill first (point))
+	     (if (not no-delete)
+		 (calc-pop-stack n (- num n -1))))
+	   (setq calc-last-kill (cons (car kill-ring) stuff)))))
+    (kill-line nn))
+)
+
+(defun calc-force-refresh ()
+  (if (or calc-executing-macro calc-display-dirty)
+      (let ((calc-executing-macro nil))
+	(calc-refresh)))
+)
+
+(defun calc-locate-cursor-element (pt)
+  (save-excursion
+    (goto-char (point-max))
+    (calc-locate-cursor-scan (- calc-stack-top) calc-stack pt))
+)
+
+(defun calc-locate-cursor-scan (n stack pt)
+  (if (or (<= (point) pt)
+	  (null stack))
+      n
+    (forward-line (- (nth 1 (car stack))))
+    (calc-locate-cursor-scan (1+ n) (cdr stack) pt))
+)
+
+(defun calc-kill-region (top bot &optional no-delete)
+  (interactive "r")
+  (if (eq major-mode 'calc-mode)
+      (calc-wrapper
+       (calc-force-refresh)
+       (calc-set-command-flag 'no-align)
+       (let* ((top-num (calc-locate-cursor-element top))
+	      (bot-num (calc-locate-cursor-element (1- bot)))
+	      (num (- top-num bot-num -1)))
+	 (copy-region-as-kill top bot)
+	 (setq calc-last-kill (cons (car kill-ring)
+				    (calc-top-list num bot-num)))
+	 (if (not no-delete)
+	     (calc-pop-stack num bot-num))))
+    (if no-delete
+	(copy-region-as-kill top bot)
+      (kill-region top bot)))
+)
+
+(defun calc-copy-as-kill (n)
+  (interactive "P")
+  (calc-kill n t)
+)
+
+(defun calc-copy-region-as-kill (top bot)
+  (interactive "r")
+  (calc-kill-region top bot t)
+)
+
+;;; This function uses calc-last-kill if possible to get an exact result,
+;;; otherwise it just parses the yanked string.
+;;; Modified to use Emacs 19 extended concept of kill-ring. -- daveg 12/15/96
+(defun calc-yank ()
+  (interactive)
+  (calc-wrapper
+   (calc-pop-push-record-list
+    0 "yank"
+    (let ((thing (if (fboundp 'current-kill)
+		     (current-kill 0 t)
+		   (car kill-ring-yank-pointer))))
+      (if (eq (car-safe calc-last-kill) thing)
+	  (cdr calc-last-kill)
+	(if (stringp thing)
+	    (let ((val (math-read-exprs (calc-clean-newlines thing))))
+	      (if (eq (car-safe val) 'error)
+		  (progn
+		    (setq val (math-read-exprs thing))
+		    (if (eq (car-safe val) 'error)
+			(error "Bad format in yanked data")
+		      val))
+		val)))))))
+)
+
+(defun calc-clean-newlines (s)
+  (cond
+   
+   ;; Omit leading/trailing whitespace
+   ((or (string-match "\\`[ \n\r]+\\([^\001]*\\)\\'" s)
+	(string-match "\\`\\([^\001]*\\)[ \n\r]+\\'" s))
+    (calc-clean-newlines (math-match-substring s 1)))
+
+   ;; Convert newlines to commas
+   ((string-match "\\`\\(.*\\)[\n\r]+\\([^\001]*\\)\\'" s)
+    (calc-clean-newlines (concat (math-match-substring s 1) ","
+				 (math-match-substring s 2))))
+   
+   (t s))
+)
+
+
+(defun calc-do-grab-region (top bot arg)
+  (and (memq major-mode '(calc-mode calc-trail-mode))
+       (error "This command works only in a regular text buffer."))
+  (let* ((from-buffer (current-buffer))
+	 (calc-was-started (get-buffer-window "*Calculator*"))
+	 (single nil)
+	 data vals pos)
+    (if arg
+	(if (consp arg)
+	    (setq single t)
+	  (setq arg (prefix-numeric-value arg))
+	  (if (= arg 0)
+	      (save-excursion
+		(beginning-of-line)
+		(setq top (point))
+		(end-of-line)
+		(setq bot (point)))
+	    (save-excursion
+	      (setq top (point))
+	      (forward-line arg)
+	      (if (> arg 0)
+		  (setq bot (point))
+		(setq bot top
+		      top (point)))))))
+    (setq data (buffer-substring top bot))
+    (calc)
+    (if single
+	(setq vals (math-read-expr data))
+      (setq vals (math-read-expr (concat "[" data "]")))
+      (and (eq (car-safe vals) 'vec)
+	   (= (length vals) 2)
+	   (eq (car-safe (nth 1 vals)) 'vec)
+	   (setq vals (nth 1 vals))))
+    (if (eq (car-safe vals) 'error)
+	(progn
+	  (if calc-was-started
+	      (pop-to-buffer from-buffer)
+	    (calc-quit t)
+	    (switch-to-buffer from-buffer))
+	  (goto-char top)
+	  (forward-char (+ (nth 1 vals) (if single 0 1)))
+	  (error (nth 2 vals))))
+    (calc-slow-wrapper
+     (calc-enter-result 0 "grab" vals)))
+)
+
+
+(defun calc-do-grab-rectangle (top bot arg &optional reduce)
+  (and (memq major-mode '(calc-mode calc-trail-mode))
+       (error "This command works only in a regular text buffer."))
+  (let* ((col1 (save-excursion (goto-char top) (current-column)))
+	 (col2 (save-excursion (goto-char bot) (current-column)))
+	 (from-buffer (current-buffer))
+	 (calc-was-started (get-buffer-window "*Calculator*"))
+	 data mat vals lnum pt pos)
+    (if (= col1 col2)
+	(save-excursion
+	  (or (= col1 0)
+	      (error "Point and mark must be at beginning of line, or define a rectangle"))
+	  (goto-char top)
+	  (while (< (point) bot)
+	    (setq pt (point))
+	    (forward-line 1)
+	    (setq data (cons (buffer-substring pt (1- (point))) data)))
+	  (setq data (nreverse data)))
+      (setq data (extract-rectangle top bot)))
+    (calc)
+    (setq mat (list 'vec)
+	  lnum 0)
+    (and arg
+	 (setq arg (if (consp arg) 0 (prefix-numeric-value arg))))
+    (while data
+      (if (natnump arg)
+	  (progn
+	    (if (= arg 0)
+		(setq arg 1000000))
+	    (setq pos 0
+		  vals (list 'vec))
+	    (let ((w (length (car data)))
+		  j v)
+	      (while (< pos w)
+		(setq j (+ pos arg)
+		      v (if (>= j w)
+			    (math-read-expr (substring (car data) pos))
+			  (math-read-expr (substring (car data) pos j))))
+		(if (eq (car-safe v) 'error)
+		    (setq vals v w 0)
+		  (setq vals (nconc vals (list v))
+			pos j)))))
+	(if (string-match "\\` *-?[0-9][0-9]?[0-9]?[0-9]?[0-9]?[0-9]? *\\'"
+			  (car data))
+	    (setq vals (list 'vec (string-to-int (car data))))
+	  (if (and (null arg)
+		   (string-match "[[{][^][{}]*[]}]" (car data)))
+	      (setq pos (match-beginning 0)
+		    vals (math-read-expr (math-match-substring (car data) 0)))
+	    (let ((s (if (string-match
+			  "\\`\\([0-9]+:[ \t]\\)?\\(.*[^, \t]\\)[, \t]*\\'"
+			  (car data))
+			 (math-match-substring (car data) 2)
+		       (car data))))
+	      (setq pos -1
+		    vals (math-read-expr (concat "[" s "]")))
+	      (if (eq (car-safe vals) 'error)
+		  (let ((v2 (math-read-expr s)))
+		    (or (eq (car-safe v2) 'error)
+			(setq vals (list 'vec v2)))))))))
+      (if (eq (car-safe vals) 'error)
+	  (progn
+	    (if calc-was-started
+		(pop-to-buffer from-buffer)
+	      (calc-quit t)
+	      (switch-to-buffer from-buffer))
+	    (goto-char top)
+	    (forward-line lnum)
+	    (forward-char (+ (nth 1 vals) (min col1 col2) pos))
+	    (error (nth 2 vals))))
+      (or (equal vals '(vec))
+	  (setq mat (cons vals mat)))
+      (setq data (cdr data)
+	    lnum (1+ lnum)))
+    (calc-slow-wrapper
+     (if reduce
+	 (calc-enter-result 0 "grb+" (list reduce '(var add var-add)
+					   (nreverse mat)))
+       (calc-enter-result 0 "grab" (nreverse mat)))))
+)
+
+
+(defun calc-copy-to-buffer (nn)
+  "Copy the top of stack into an editing buffer."
+  (interactive "P")
+  (let ((thebuf (and (not (memq major-mode '(calc-mode calc-trail-mode)))
+		     (current-buffer)))
+	(movept nil)
+	oldbuf newbuf)
+    (calc-wrapper
+     (save-excursion
+       (calc-force-refresh)
+       (let ((n (prefix-numeric-value nn))
+	     (eat-lnums calc-line-numbering)
+	     (big-offset (if (eq calc-language 'big) 1 0))
+	     top bot)
+	 (setq oldbuf (current-buffer)
+	       newbuf (or thebuf
+			  (calc-find-writable-buffer (buffer-list) 0)
+			  (calc-find-writable-buffer (buffer-list) 1)
+			  (error "No other buffer")))
+	 (cond ((and (or (null nn)
+			 (consp nn))
+		     (= (calc-substack-height 0)
+			(- (1- (calc-substack-height 1)) big-offset)))
+		(calc-cursor-stack-index 1)
+		(if (looking-at
+		     (if calc-line-numbering "[0-9]+: *[^ \n]" " *[^ \n]"))
+		    (goto-char (1- (match-end 0))))
+		(setq eat-lnums nil
+		      top (point))
+		(calc-cursor-stack-index 0)
+		(setq bot (- (1- (point)) big-offset)))
+	       ((> n 0)
+		(calc-cursor-stack-index n)
+		(setq top (point))
+		(calc-cursor-stack-index 0)
+		(setq bot (- (point) big-offset)))
+	       ((< n 0)
+		(calc-cursor-stack-index (- n))
+		(setq top (point))
+		(calc-cursor-stack-index (1- (- n)))
+		(setq bot (point)))
+	       (t
+		(goto-char (point-min))
+		(forward-line 1)
+		(setq top (point))
+		(calc-cursor-stack-index 0)
+		(setq bot (point))))
+	 (save-excursion
+	   (set-buffer newbuf)
+	   (if (consp nn)
+	       (kill-region (region-beginning) (region-end)))
+	   (push-mark (point) t)
+	   (if (and overwrite-mode (not (consp nn)))
+	       (calc-overwrite-string (save-excursion
+					(set-buffer oldbuf)
+					(buffer-substring top bot))
+				      eat-lnums)
+	     (or (bolp) (setq eat-lnums nil))
+	     (insert-buffer-substring oldbuf top bot)
+	     (and eat-lnums
+		  (let ((n 1))
+		    (while (and (> (point) (mark))
+				(progn
+				  (forward-line -1)
+				  (>= (point) (mark))))
+		      (delete-char 4)
+		      (setq n (1+ n)))
+		    (forward-line n))))
+	   (if thebuf (setq movept (point)))
+	   (if (get-buffer-window (current-buffer))
+	       (set-window-point (get-buffer-window (current-buffer))
+				 (point)))))))
+    (if movept (goto-char movept))
+    (and (consp nn)
+	 (not thebuf)
+	 (progn
+	   (calc-quit t)
+	   (switch-to-buffer newbuf))))
+)
+
+(defun calc-overwrite-string (str eat-lnums)
+  (if (string-match "\n\\'" str)
+      (setq str (substring str 0 -1)))
+  (if eat-lnums
+      (setq str (substring str 4)))
+  (if (and (string-match "\\`[-+]?[0-9.]+\\(e-?[0-9]+\\)?\\'" str)
+	   (looking-at "[-+]?[0-9.]+\\(e-?[0-9]+\\)?"))
+      (progn
+	(delete-region (point) (match-end 0))
+	(insert str))
+    (let ((i 0))
+      (while (< i (length str))
+	(if (= (setq last-command-char (aref str i)) ?\n)
+	    (or (= i (1- (length str)))
+		(let ((pt (point)))
+		  (end-of-line)
+		  (delete-region pt (point))
+		  (if (eobp)
+		      (insert "\n")
+		    (forward-char 1))
+		  (if eat-lnums (setq i (+ i 4)))))
+	  (self-insert-command 1))
+	(setq i (1+ i)))))
+)
+
+;;; First, require that buffer is visible and does not begin with "*"
+;;; Second, require only that it not begin with "*Calc"
+(defun calc-find-writable-buffer (buf mode)
+  (and buf
+       (if (or (string-match "\\`\\( .*\\|\\*Calc.*\\)"
+			     (buffer-name (car buf)))
+	       (and (= mode 0)
+		    (or (string-match "\\`\\*.*" (buffer-name (car buf)))
+			(not (get-buffer-window (car buf))))))
+	   (calc-find-writable-buffer (cdr buf) mode)
+	 (car buf)))
+)
+
+
+(defun calc-edit (n)
+  (interactive "p")
+  (calc-slow-wrapper
+   (if (eq n 0)
+       (setq n (calc-stack-size)))
+   (let* ((flag nil)
+	  (allow-ret (> n 1))
+	  (list (math-showing-full-precision
+		 (mapcar (if (> n 1)
+			     (function (lambda (x)
+					 (math-format-flat-expr x 0)))
+			   (function
+			    (lambda (x)
+			      (if (math-vectorp x) (setq allow-ret t))
+			      (math-format-nice-expr x (screen-width)))))
+			 (if (> n 0)
+			     (calc-top-list n)
+			   (calc-top-list 1 (- n)))))))
+     (calc-edit-mode (list 'calc-finish-stack-edit (or flag n)) allow-ret)
+     (while list
+       (insert (car list) "\n")
+       (setq list (cdr list)))))
+  (calc-show-edit-buffer)
+)
+
+(defun calc-alg-edit (str)
+  (calc-edit-mode '(calc-finish-stack-edit 0))
+  (calc-show-edit-buffer)
+  (insert str "\n")
+  (backward-char 1)
+  (calc-set-command-flag 'do-edit)
+)
+
+(defvar calc-edit-mode-map nil "Keymap for use by the calc-edit command.")
+(if calc-edit-mode-map
+    ()
+  (setq calc-edit-mode-map (make-sparse-keymap))
+  (define-key calc-edit-mode-map "\n" 'calc-edit-finish)
+  (define-key calc-edit-mode-map "\r" 'calc-edit-return)
+  (define-key calc-edit-mode-map "\C-c\C-c" 'calc-edit-finish)
+)
+
+(defun calc-edit-mode (&optional handler allow-ret title)
+  "Calculator editing mode.  Press RET, LFD, or C-c C-c to finish.
+To cancel the edit, simply kill the *Calc Edit* buffer."
+  (interactive)
+  (or handler
+      (error "This command can be used only indirectly through calc-edit."))
+  (let ((oldbuf (current-buffer))
+	(buf (get-buffer-create "*Calc Edit*")))
+    (set-buffer buf)
+    (kill-all-local-variables)
+    (use-local-map calc-edit-mode-map)
+    (setq buffer-read-only nil)
+    (setq truncate-lines nil)
+    (setq major-mode 'calc-edit-mode)
+    (setq mode-name "Calc Edit")
+    (run-hooks 'calc-edit-mode-hook)
+    (make-local-variable 'calc-original-buffer)
+    (setq calc-original-buffer oldbuf)
+    (make-local-variable 'calc-return-buffer)
+    (setq calc-return-buffer oldbuf)
+    (make-local-variable 'calc-one-window)
+    (setq calc-one-window (and (one-window-p t) pop-up-windows))
+    (make-local-variable 'calc-edit-handler)
+    (setq calc-edit-handler handler)
+    (make-local-variable 'calc-restore-trail)
+    (setq calc-restore-trail (get-buffer-window (calc-trail-buffer)))
+    (make-local-variable 'calc-allow-ret)
+    (setq calc-allow-ret allow-ret)
+    (erase-buffer)
+    (insert (or title title "Calc Edit Mode")
+	    ".  Press "
+	    (if (eq (lookup-key (current-global-map) "\e#") 'calc-dispatch)
+		"M-# M-# or C-c C-c"
+	      (if allow-ret "C-c C-c" "RET"))
+	    " to finish, "
+	    (if (eq (lookup-key (current-global-map) "\e#") 'calc-dispatch)
+		"M-# x"
+	      "C-x k RET")
+	    " to cancel.\n"))
+)
+(put 'calc-edit-mode 'mode-class 'special)
+
+(defun calc-show-edit-buffer ()
+  (let ((buf (current-buffer)))
+    (if (and (one-window-p t) pop-up-windows)
+	(pop-to-buffer (get-buffer-create "*Calc Edit*"))
+      (and calc-embedded-info (get-buffer-window (aref calc-embedded-info 1))
+	   (select-window (get-buffer-window (aref calc-embedded-info 1))))
+      (switch-to-buffer (get-buffer-create "*Calc Edit*")))
+    (setq calc-return-buffer buf)
+    (if (and (< (window-width) (screen-width))
+	     calc-display-trail)
+	(let ((win (get-buffer-window (calc-trail-buffer))))
+	  (if win
+	      (delete-window win))))
+    (set-buffer-modified-p nil)
+    (goto-char (point-min))
+    (forward-line 1))
+)
+
+(defun calc-edit-return ()
+  (interactive)
+  (if (and (boundp 'calc-allow-ret) calc-allow-ret)
+      (newline)
+    (calc-edit-finish))
+)
+
+(defun calc-edit-finish (&optional keep)
+  "Finish calc-edit mode.  Parse buffer contents and push them on the stack."
+  (interactive "P")
+  (message "Working...")
+  (or (and (boundp 'calc-original-buffer)
+	   (boundp 'calc-return-buffer)
+	   (boundp 'calc-one-window)
+	   (boundp 'calc-edit-handler)
+	   (boundp 'calc-restore-trail)
+	   (eq major-mode 'calc-edit-mode))
+      (error "This command is valid only in buffers created by calc-edit."))
+  (let ((buf (current-buffer))
+	(original calc-original-buffer)
+	(return calc-return-buffer)
+	(one-window calc-one-window)
+	(disp-trail calc-restore-trail))
+    (save-excursion
+      (if (or (null (buffer-name original))
+	      (progn
+		(set-buffer original)
+		(not (eq major-mode 'calc-mode))))
+	  (error "Original calculator buffer has been corrupted.")))
+    (goto-char (point-min))
+    (if (looking-at "Calc Edit\\|Editing ")
+	(forward-line 1))
+    (if (buffer-modified-p)
+	(eval calc-edit-handler))
+    (if one-window
+	(delete-window))
+    (if (get-buffer-window return)
+	(select-window (get-buffer-window return))
+      (switch-to-buffer return))
+    (if keep
+	(bury-buffer buf)
+      (kill-buffer buf))
+    (if disp-trail
+	(calc-wrapper
+	 (calc-trail-display 1 t)))
+    (message ""))
+)
+
+(defun calc-edit-cancel ()
+  "Cancel calc-edit mode.  Ignore the Calc Edit buffer and don't change stack."
+  (interactive)
+  (let ((calc-edit-handler nil))
+    (calc-edit-finish))
+  (message "(Cancelled)")
+)
+
+(defun calc-finish-stack-edit (num)
+  (let ((buf (current-buffer))
+	(str (buffer-substring (point) (point-max)))
+	(start (point))
+	pos)
+    (if (and (integerp num) (> num 1))
+	(while (setq pos (string-match "\n." str))
+	  (aset str pos ?\,)))
+    (switch-to-buffer calc-original-buffer)
+    (let ((vals (let ((calc-language nil)
+		      (math-expr-opers math-standard-opers))
+		  (and (string-match "[^\n\t ]" str)
+		       (math-read-exprs str)))))
+      (if (eq (car-safe vals) 'error)
+	  (progn
+	    (switch-to-buffer buf)
+	    (goto-char (+ start (nth 1 vals)))
+	    (error (nth 2 vals))))
+      (calc-wrapper
+       (if (symbolp num)
+	   (progn
+	     (set num (car vals))
+	     (calc-refresh-evaltos num))
+	 (if disp-trail
+	     (calc-trail-display 1 t))
+	 (and vals
+	      (let ((calc-simplify-mode (if (eq last-command-char ?\C-j)
+					    'none
+					  calc-simplify-mode)))
+		(if (>= num 0)
+		    (calc-enter-result num "edit" vals)
+		  (calc-enter-result 1 "edit" vals (- num)))))))))
+)
+
+
+
+