1 ;;; calc-sel.el --- data selection functions for Calc
3 ;; Copyright (C) 1990, 1991, 1992, 1993, 2001, 2002, 2003, 2004,
4 ;; 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
6 ;; Author: David Gillespie <daveg@synaptics.com>
7 ;; Maintainer: Jay Belanger <jay.p.belanger@gmail.com>
9 ;; This file is part of GNU Emacs.
11 ;; GNU Emacs is free software: you can redistribute it and/or modify
12 ;; it under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation, either version 3 of the License, or
14 ;; (at your option) any later version.
16 ;; GNU Emacs is distributed in the hope that it will be useful,
17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 ;; GNU General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
28 ;; This file is autoloaded from calc-ext.el.
33 ;;; Selection commands.
35 (defvar calc-keep-selection t)
37 (defvar calc-selection-cache-entry nil)
38 (defvar calc-selection-cache-num)
39 (defvar calc-selection-cache-comp)
40 (defvar calc-selection-cache-offset)
41 (defvar calc-selection-true-num)
43 (defun calc-select-here (num &optional once keep)
46 (calc-prepare-selection)
47 (let ((found (calc-find-selected-part))
48 (entry calc-selection-cache-entry))
49 (or (and keep (nth 2 entry))
52 (setq calc-keep-selection nil)
53 (message "(Selection will apply to next command only)")))
54 (calc-change-current-selection
56 (if (and num (> (setq num (prefix-numeric-value num)) 0))
58 (while (and (>= (setq num (1- num)) 0)
59 (not (eq found (car entry))))
60 (setq found (calc-find-assoc-parent-formula
63 (calc-grow-assoc-formula (car entry) found))
66 (defun calc-select-once (num)
68 (calc-select-here num t))
70 (defun calc-select-here-maybe (num)
72 (calc-select-here num nil t))
74 (defun calc-select-once-maybe (num)
76 (calc-select-here num t t))
78 (defun calc-select-additional ()
81 (let (calc-keep-selection)
82 (calc-prepare-selection))
83 (let ((found (calc-find-selected-part))
84 (entry calc-selection-cache-entry))
85 (calc-change-current-selection
87 (let ((sel (nth 2 entry)))
90 (while (not (or (eq sel (car entry))
91 (calc-find-sub-formula sel found)))
92 (setq sel (calc-find-assoc-parent-formula
95 (calc-grow-assoc-formula (car entry) found)))
98 (defun calc-select-more (num)
101 (calc-prepare-selection)
102 (let ((entry calc-selection-cache-entry))
104 (let ((sel (nth 2 entry)))
105 (while (and (not (eq sel (car entry)))
106 (>= (setq num (1- (prefix-numeric-value num))) 0))
107 (setq sel (calc-find-assoc-parent-formula (car entry) sel)))
108 (calc-change-current-selection sel))
109 (calc-select-here num)))))
111 (defun calc-select-less (num)
114 (calc-prepare-selection)
115 (let ((found (calc-find-selected-part))
116 (entry calc-selection-cache-entry))
117 (calc-change-current-selection
119 (let ((sel (nth 2 entry))
123 (>= (setq num (1- num)) 0))
125 index (calc-find-sub-formula sel found))
126 (and (setq sel (and index (nth index old)))
127 calc-assoc-selections
128 (setq op (assq (car-safe sel) calc-assoc-ops))
129 (memq (car old) (nth index op))
130 (setq num (1+ num))))
133 (defun calc-select-part (num)
135 (or num (setq num (- last-command-event ?0)))
137 (calc-prepare-selection)
138 (let ((sel (calc-find-nth-part (or (nth 2 calc-selection-cache-entry)
139 (car calc-selection-cache-entry))
142 (calc-change-current-selection sel)
143 (error "%d is not a valid sub-formula index" num)))))
145 ;; The variables calc-fnp-op and calc-fnp-num are local to
146 ;; calc-find-nth-part (and calc-select-previous) but used by
147 ;; calc-find-nth-part-rec, which is called by them.
149 (defvar calc-fnp-num)
151 (defun calc-find-nth-part (expr calc-fnp-num)
152 (if (and calc-assoc-selections
153 (assq (car-safe expr) calc-assoc-ops))
155 (calc-find-nth-part-rec expr))
156 (if (eq (car-safe expr) 'intv)
157 (and (>= calc-fnp-num 1) (<= calc-fnp-num 2) (nth (1+ calc-fnp-num) expr))
158 (and (not (Math-primp expr)) (>= calc-fnp-num 1) (< calc-fnp-num (length expr))
159 (nth calc-fnp-num expr)))))
161 (defun calc-find-nth-part-rec (expr) ; uses num, op
162 (or (if (and (setq calc-fnp-op (assq (car-safe (nth 1 expr)) calc-assoc-ops))
163 (memq (car expr) (nth 1 calc-fnp-op)))
164 (calc-find-nth-part-rec (nth 1 expr))
165 (and (= (setq calc-fnp-num (1- calc-fnp-num)) 0)
167 (if (and (setq calc-fnp-op (assq (car-safe (nth 2 expr)) calc-assoc-ops))
168 (memq (car expr) (nth 2 calc-fnp-op)))
169 (calc-find-nth-part-rec (nth 2 expr))
170 (and (= (setq calc-fnp-num (1- calc-fnp-num)) 0)
173 (defun calc-select-next (num)
176 (calc-select-previous (- num))
178 (calc-prepare-selection)
179 (let* ((entry calc-selection-cache-entry)
183 (while (>= (setq num (1- num)) 0)
184 (let* ((parent (calc-find-parent-formula (car entry) sel))
187 (and (eq p t) (setq p nil))
188 (while (and (setq p (cdr p))
189 (not (eq (car p) sel))))
191 (setq sel (or (and calc-assoc-selections
192 (setq op (assq (car-safe (nth 1 p))
194 (memq (car parent) (nth 2 op))
197 (if (and calc-assoc-selections
198 (setq op (assq (car-safe parent) calc-assoc-ops))
199 (consp (setq p (calc-find-parent-formula
200 (car entry) parent)))
201 (eq (nth 1 p) parent)
202 (memq (car p) (nth 1 op)))
204 (error "No \"next\" sub-formula")))))
205 (calc-change-current-selection sel))
206 (if (Math-primp (car entry))
207 (calc-change-current-selection (car entry))
208 (calc-select-part num)))))))
210 (defun calc-select-previous (num)
213 (calc-select-next (- num))
215 (calc-prepare-selection)
216 (let* ((entry calc-selection-cache-entry)
220 (while (>= (setq num (1- num)) 0)
221 (let* ((parent (calc-find-parent-formula (car entry) sel))
222 (p (cdr-safe parent))
225 (if (eq (car-safe parent) 'intv) (setq p (cdr p)))
226 (while (and (not (eq (car p) sel))
230 (setq sel (or (and calc-assoc-selections
231 (setq op (assq (car-safe prev)
233 (memq (car parent) (nth 1 op))
236 (if (and calc-assoc-selections
237 (setq op (assq (car-safe parent) calc-assoc-ops))
238 (consp (setq p (calc-find-parent-formula
239 (car entry) parent)))
240 (eq (nth 2 p) parent)
241 (memq (car p) (nth 2 op)))
243 (error "No \"previous\" sub-formula")))))
244 (calc-change-current-selection sel))
245 (if (Math-primp (car entry))
246 (calc-change-current-selection (car entry))
247 (let ((len (if (and calc-assoc-selections
248 (assq (car (car entry)) calc-assoc-ops))
249 (let (calc-fnp-op (calc-fnp-num 0))
250 (calc-find-nth-part-rec (car entry))
252 (length (car entry)))))
253 (calc-select-part (- len num)))))))))
255 (defun calc-find-parent-formula (expr part)
256 (cond ((eq expr part) t)
257 ((Math-primp expr) nil)
260 (while (and (setq p (cdr p))
261 (not (setq res (calc-find-parent-formula
264 (if (eq res t) expr res))))))
267 (defun calc-find-assoc-parent-formula (expr part)
268 (calc-grow-assoc-formula expr (calc-find-parent-formula expr part)))
270 (defun calc-grow-assoc-formula (expr part)
271 (if calc-assoc-selections
272 (let ((op (assq (car-safe part) calc-assoc-ops)))
275 (while (and (consp (setq new (calc-find-parent-formula
278 (nth (calc-find-sub-formula new part) op)))
283 (defun calc-find-sub-formula (expr part)
284 (cond ((eq expr part) t)
285 ((Math-primp expr) nil)
288 (while (and (setq expr (cdr expr))
289 (not (calc-find-sub-formula (car expr) part)))
293 (defun calc-unselect (num)
296 (calc-prepare-selection num)
297 (calc-change-current-selection nil)))
299 (defun calc-clear-selections ()
302 (let ((limit (calc-stack-size))
305 (if (calc-top n 'sel)
307 (calc-prepare-selection n)
308 (calc-change-current-selection nil)))
310 (calc-clear-command-flag 'position-point)))
312 (defvar calc-highlight-selections-with-faces)
314 (defun calc-show-selections (arg)
317 (calc-preserve-point)
318 (setq calc-show-selections (if arg
319 (> (prefix-numeric-value arg) 0)
320 (not calc-show-selections)))
321 (let ((p calc-stack))
323 (or (null (nth 2 (car p)))
324 (equal (car p) calc-selection-cache-entry)))
327 (let ((calc-selection-cache-default-entry
328 calc-selection-cache-entry))
330 (and calc-selection-cache-entry
331 (let ((sel (nth 2 calc-selection-cache-entry)))
332 (setcar (nthcdr 2 calc-selection-cache-entry) nil)
333 (calc-change-current-selection sel)))))
334 (message (if calc-show-selections
335 (if calc-highlight-selections-with-faces
336 "De-emphasizing all but selected part of formulas"
337 "Displaying only selected part of formulas")
338 (if calc-highlight-selections-with-faces
339 "Emphasizing selected part of formulas"
340 "Displaying all but selected part of formulas")))))
342 ;; The variables calc-final-point-line and calc-final-point-column
343 ;; are declared in calc.el, and are used throughout.
344 (defvar calc-final-point-line)
345 (defvar calc-final-point-column)
347 (defun calc-preserve-point ()
348 (or (looking-at "\\.\n+\\'")
350 (setq calc-final-point-line (+ (count-lines (point-min) (point))
352 calc-final-point-column (current-column))
353 (calc-set-command-flag 'position-point))))
355 (defun calc-enable-selections (arg)
358 (calc-preserve-point)
359 (setq calc-use-selections (if arg
360 (> (prefix-numeric-value arg) 0)
361 (not calc-use-selections)))
362 (calc-set-command-flag 'renum-stack)
363 (message (if calc-use-selections
364 "Commands operate only on selected sub-formulas"
365 "Selections of sub-formulas have no effect"))))
367 (defun calc-break-selections (arg)
370 (calc-preserve-point)
371 (setq calc-assoc-selections (if arg
372 (<= (prefix-numeric-value arg) 0)
373 (not calc-assoc-selections)))
374 (message (if calc-assoc-selections
375 "Selection treats a+b+c as a sum of three terms"
376 "Selection treats a+b+c as (a+b)+c"))))
378 (defun calc-prepare-selection (&optional num)
379 (or num (setq num (calc-locate-cursor-element (point))))
380 (setq calc-selection-true-num num
381 calc-keep-selection t)
382 (or (> num 0) (setq num 1))
383 ;; (if (or (< num 1) (> num (calc-stack-size)))
384 ;; (error "Cursor must be positioned on a stack element"))
385 (let* ((entry (calc-top num 'entry))
387 (or (equal entry calc-selection-cache-entry)
389 (setcar entry (calc-encase-atoms (car entry)))
390 (setq calc-selection-cache-entry entry
391 calc-selection-cache-num num
392 calc-selection-cache-comp
393 (let ((math-comp-tagged t))
394 (math-compose-expr (car entry) 0))
395 calc-selection-cache-offset
396 (+ (car (math-stack-value-offset calc-selection-cache-comp))
397 (length calc-left-label)
398 (if calc-line-numbering 4 0))))))
399 (calc-preserve-point))
401 ;;; The following ensures that no two subformulas will be "eq" to each other!
402 (defun calc-encase-atoms (x)
403 (if (or (not (consp x))
404 (equal x '(float 0 0)))
406 (calc-encase-atoms-rec x)
409 (defun calc-encase-atoms-rec (x)
412 (if (eq (car x) 'intv)
414 (while (setq x (cdr x))
415 (if (or (not (consp (car x)))
416 (equal (car x) '(float 0 0)))
417 (setcar x (list 'cplx (car x) 0))
418 (calc-encase-atoms-rec (car x)))))))
420 ;; The variable math-comp-sel-tag is local to calc-find-selected-part,
421 ;; but is used by math-comp-sel-flat-term and math-comp-add-string-sel
422 ;; in calccomp.el, which are called (indirectly) by calc-find-selected-part.
424 (defun calc-find-selected-part ()
425 (let* ((math-comp-sel-hpos (- (current-column) calc-selection-cache-offset))
429 (math-comp-sel-vpos (save-excursion
431 (let ((line (point)))
432 (calc-cursor-stack-index
433 calc-selection-cache-num)
435 (while (< (point) line)
437 (setq spaces (+ spaces
438 (current-indentation))
440 (- lcount (math-comp-ascent
441 calc-selection-cache-comp) -1))))
442 (math-comp-sel-cpos (- (point) toppt calc-selection-cache-offset
444 (math-comp-sel-tag nil))
445 (and (>= math-comp-sel-hpos 0)
446 (> calc-selection-true-num 0)
447 (math-composition-to-string calc-selection-cache-comp 1000000))
448 (nth 1 math-comp-sel-tag)))
450 (defun calc-change-current-selection (sub-expr)
451 (or (eq sub-expr (nth 2 calc-selection-cache-entry))
452 (let ((calc-prepared-composition calc-selection-cache-comp)
453 (buffer-read-only nil)
455 (calc-set-command-flag 'renum-stack)
456 (setcar (nthcdr 2 calc-selection-cache-entry) sub-expr)
457 (calc-cursor-stack-index calc-selection-cache-num)
459 (calc-cursor-stack-index (1- calc-selection-cache-num))
460 (delete-region top (point))
461 (let ((calc-selection-cache-default-entry calc-selection-cache-entry))
462 (insert (math-format-stack-value calc-selection-cache-entry)
465 (defun calc-top-selected (&optional n m)
466 (and calc-any-selections
471 (calc-check-stack (+ n m -1))
472 (let ((top (nthcdr (+ m calc-stack-top -1) calc-stack))
474 (while (>= (setq n (1- n)) 0)
475 (if (nth 2 (car top))
476 (setq sel (if sel t (nth 2 (car top)))))
477 (setq top (cdr top)))
480 ;; The variables calc-rsf-old and calc-rsf-new are local to
481 ;; calc-replace-sub-formula, but used by calc-replace-sub-formula-rec,
482 ;; which is called by calc-replace-sub-formula.
483 (defvar calc-rsf-old)
484 (defvar calc-rsf-new)
486 (defun calc-replace-sub-formula (expr calc-rsf-old calc-rsf-new)
487 (setq calc-rsf-new (calc-encase-atoms calc-rsf-new))
488 (calc-replace-sub-formula-rec expr))
490 (defun calc-replace-sub-formula-rec (expr)
491 (cond ((eq expr calc-rsf-old) calc-rsf-new)
492 ((Math-primp expr) expr)
495 (mapcar 'calc-replace-sub-formula-rec (cdr expr))))))
497 (defun calc-sel-error ()
498 (error "Invalid operation on sub-formulas"))
500 (defun calc-replace-selections (n vals m)
501 (if (calc-top-selected n m)
502 (let ((num (length vals)))
503 (calc-preserve-point)
506 (let* ((old (calc-top-list n m 'entry))
511 (if (nth 2 (car old))
512 (setq val (calc-encase-atoms (car vals))
513 new (cons (calc-replace-sub-formula (car (car old))
518 (setq new (cons (car vals) new)
520 (setq vals (cdr vals)
522 (calc-pop-stack n m t)
523 (calc-push-list (nreverse new)
524 m (and calc-keep-selection (nreverse sel)))))
526 (let* ((old (calc-top-list n m 'entry))
528 (while (and old (not (nth 2 (car old))))
529 (setq old (cdr old)))
531 (while (and (setq more (cdr more)) (not (nth 2 (car more)))))
534 (calc-pop-stack n m t)
536 (let ((val (calc-encase-atoms (car vals))))
537 (calc-push-list (list (calc-replace-sub-formula
541 m (and calc-keep-selection (list val))))
542 (calc-push-list vals))))
543 (t (calc-sel-error))))
544 (calc-pop-stack n m t)
545 (calc-push-list vals m)))
547 (defun calc-delete-selection (n)
548 (let ((entry (calc-top n 'entry)))
550 (if (eq (nth 2 entry) (car entry))
552 (calc-pop-stack 1 n t)
553 (calc-push-list '(0) n))
554 (let ((parent (calc-find-parent-formula (car entry) (nth 2 entry)))
556 (calc-preserve-point)
557 (calc-pop-stack 1 n t)
558 (cond ((or (memq (car parent) '(* / %))
559 (and (eq (car parent) '^)
560 (eq (nth 2 parent) (nth 2 entry))))
562 ((memq (car parent) '(vec calcFunc-min calcFunc-max)))
563 ((and (assq (car parent) calc-tweak-eqn-table)
564 (= (length parent) 3))
570 (calc-push-list (list
572 (calc-replace-sub-formula
575 (if (eq (nth 2 entry) (nth 1 parent))
580 (calc-push-list (list
582 (calc-replace-sub-formula (car entry)
587 (calc-push-list (list
589 (calc-replace-sub-formula (car entry)
595 (calc-pop-stack 1 n t))))
597 (defun calc-roll-down-with-selections (n m)
598 (let ((vals (append (calc-top-list m 1)
599 (calc-top-list (- n m) (1+ m))))
600 (sels (append (calc-top-list m 1 'sel)
601 (calc-top-list (- n m) (1+ m) 'sel))))
602 (calc-pop-push-list n vals 1 sels)))
604 (defun calc-roll-up-with-selections (n m)
605 (let ((vals (append (calc-top-list (- n m) 1)
606 (calc-top-list m (- n m -1))))
607 (sels (append (calc-top-list (- n m) 1 'sel)
608 (calc-top-list m (- n m -1) 'sel))))
609 (calc-pop-push-list n vals 1 sels)))
611 ;; The variable calc-sel-reselect is local to several functions
612 ;; which call calc-auto-selection.
613 (defvar calc-sel-reselect)
615 (defun calc-auto-selection (entry)
618 (setq calc-sel-reselect nil)
619 (calc-prepare-selection)
620 (calc-grow-assoc-formula (car entry) (calc-find-selected-part)))))
622 (defun calc-copy-selection ()
625 (calc-preserve-point)
626 (let* ((num (max 1 (calc-locate-cursor-element (point))))
627 (entry (calc-top num 'entry)))
628 (calc-push (or (calc-auto-selection entry) (car entry))))))
630 (defun calc-del-selection ()
633 (calc-preserve-point)
634 (let* ((num (max 1 (calc-locate-cursor-element (point))))
635 (entry (calc-top num 'entry))
636 (sel (calc-auto-selection entry)))
637 (setcar (nthcdr 2 entry) (and (not (eq sel (car entry))) sel))
638 (calc-delete-selection num))))
640 (defvar calc-selection-history nil
641 "History for calc selections.")
643 (defun calc-enter-selection ()
646 (calc-preserve-point)
647 (let* ((num (max 1 (calc-locate-cursor-element (point))))
648 (calc-sel-reselect calc-keep-selection)
649 (entry (calc-top num 'entry))
651 (sel (or (calc-auto-selection entry) expr))
653 (let ((calc-dollar-values (list sel))
654 (calc-dollar-used 0))
655 (setq alg (calc-do-alg-entry "" "Replace selection with: " nil
656 'calc-selection-history))
659 (setq alg (calc-encase-atoms (car alg)))
660 (calc-pop-push-record-list 1 "repl"
661 (list (calc-replace-sub-formula
664 (list (and calc-sel-reselect alg))))))
665 (calc-handle-whys))))
667 (defun calc-edit-selection ()
670 (calc-preserve-point)
671 (let* ((num (max 1 (calc-locate-cursor-element (point))))
672 (calc-sel-reselect calc-keep-selection)
673 (entry (calc-top num 'entry))
675 (sel (or (calc-auto-selection entry) expr))
677 (let ((str (math-showing-full-precision
678 (math-format-nice-expr sel (frame-width)))))
679 (calc-edit-mode (list 'calc-finish-selection-edit
680 num (list 'quote sel) calc-sel-reselect))
682 (calc-show-edit-buffer))
684 (defvar calc-original-buffer)
686 ;; The variable calc-edit-disp-trail is local to calc-edit-finish,
688 (defvar calc-edit-disp-trail)
689 (defvar calc-edit-top)
691 (defun calc-finish-selection-edit (num sel reselect)
692 (let ((buf (current-buffer))
693 (str (buffer-substring calc-edit-top (point-max)))
695 (switch-to-buffer calc-original-buffer)
696 (let ((val (math-read-expr str)))
697 (if (eq (car-safe val) 'error)
699 (switch-to-buffer buf)
700 (goto-char (+ start (nth 1 val)))
701 (error (nth 2 val))))
703 (calc-preserve-point)
704 (if calc-edit-disp-trail
705 (calc-trail-display 1 t))
706 (setq val (calc-encase-atoms (calc-normalize val)))
707 (let ((expr (calc-top num 'full)))
708 (if (calc-find-sub-formula expr sel)
709 (calc-pop-push-record-list 1 "edit"
710 (list (calc-replace-sub-formula
713 (list (and reselect val)))
715 (error "Original selection has been lost")))))))
717 (defun calc-sel-evaluate (arg)
720 (calc-preserve-point)
721 (let* ((num (max 1 (calc-locate-cursor-element (point))))
722 (calc-sel-reselect calc-keep-selection)
723 (entry (calc-top num 'entry))
724 (sel (or (calc-auto-selection entry) (car entry))))
725 (calc-with-default-simplification
726 (let ((math-simplify-only nil))
727 (calc-modify-simplify-mode arg)
728 (let ((val (calc-encase-atoms (calc-normalize sel))))
729 (calc-pop-push-record-list 1 "jsmp"
730 (list (calc-replace-sub-formula
731 (car entry) sel val))
733 (list (and calc-sel-reselect val))))))
734 (calc-handle-whys))))
736 (defun calc-sel-expand-formula (arg)
739 (calc-preserve-point)
740 (let* ((num (max 1 (calc-locate-cursor-element (point))))
741 (calc-sel-reselect calc-keep-selection)
742 (entry (calc-top num 'entry))
743 (sel (or (calc-auto-selection entry) (car entry))))
744 (calc-with-default-simplification
745 (let ((math-simplify-only nil))
746 (calc-modify-simplify-mode arg)
747 (let* ((math-expand-formulas (> arg 0))
748 (val (calc-normalize sel))
751 (setq top (math-expand-formula val))
752 (setq val (calc-normalize top)))
753 (setq val (calc-encase-atoms val))
754 (calc-pop-push-record-list 1 "jexf"
755 (list (calc-replace-sub-formula
756 (car entry) sel val))
758 (list (and calc-sel-reselect val))))))
759 (calc-handle-whys))))
761 (defun calc-sel-mult-both-sides (arg &optional divide)
764 (calc-preserve-point)
765 (let* ((no-simp (consp arg))
766 (num (max 1 (calc-locate-cursor-element (point))))
767 (calc-sel-reselect calc-keep-selection)
768 (entry (calc-top num 'entry))
770 (sel (or (calc-auto-selection entry) expr))
771 (func (car-safe sel))
773 (setq alg (calc-with-default-simplification
774 (car (calc-do-alg-entry ""
776 "Divide both sides by: "
777 "Multiply both sides by: ")
778 nil 'calc-selection-history))))
781 (if (and (or (eq func '/)
782 (assq func calc-tweak-eqn-table))
785 (or (memq func '(/ calcFunc-eq calcFunc-neq))
786 (if (math-known-nonposp alg)
788 (setq func (nth 1 (assq func
789 calc-tweak-eqn-table)))
790 (or (math-known-negp alg)
791 (message "Assuming this factor is nonzero")))
792 (or (math-known-posp alg)
793 (if (math-known-nonnegp alg)
794 (message "Assuming this factor is nonzero")
795 (message "Assuming this factor is positive")))))
796 (setq lhs (list (if divide '/ '*) (nth 1 sel) alg)
797 rhs (list (if divide '/ '*) (nth 2 sel) alg))
800 (setq lhs (math-simplify lhs)
801 rhs (math-simplify rhs))
803 (or (Math-equal (nth 1 sel) 1)
804 (Math-equal (nth 1 sel) -1))
805 ; (and (memq (car-safe (nth 2 sel)) '(+ -))
806 ; (memq (car-safe alg) '(+ -))))
808 (setq rhs (math-expand-term rhs))))))
809 (if (and arg (not no-simp))
810 (setq rhs (math-simplify
811 (calcFunc-expand rhs (unless (= arg 0) arg)))))
812 (setq alg (calc-encase-atoms
813 (calc-normalize (list func lhs rhs)))))
814 (setq rhs (list (if divide '* '/) sel alg))
816 (setq rhs (math-simplify rhs)))
817 (setq alg (calc-encase-atoms
818 (calc-normalize (if divide
820 (list '* alg rhs))))))
821 (calc-pop-push-record-list 1 (if divide "div" "mult")
822 (list (calc-replace-sub-formula
825 (list (and calc-sel-reselect alg)))))
826 (calc-handle-whys))))
828 (defun calc-sel-div-both-sides (no-simp)
830 (calc-sel-mult-both-sides no-simp t))
832 (defun calc-sel-add-both-sides (no-simp &optional subtract)
835 (calc-preserve-point)
836 (let* ((num (max 1 (calc-locate-cursor-element (point))))
837 (calc-sel-reselect calc-keep-selection)
838 (entry (calc-top num 'entry))
840 (sel (or (calc-auto-selection entry) expr))
841 (func (car-safe sel))
843 (setq alg (calc-with-default-simplification
844 (car (calc-do-alg-entry ""
846 "Subtract from both sides: "
847 "Add to both sides: ")
848 nil 'calc-selection-history))))
851 (if (and (assq func calc-tweak-eqn-table)
854 (setq lhs (list (if subtract '- '+) (nth 1 sel) alg)
855 rhs (list (if subtract '- '+) (nth 2 sel) alg))
857 (setq lhs (math-simplify lhs)
858 rhs (math-simplify rhs)))
859 (setq alg (calc-encase-atoms
860 (calc-normalize (list func lhs rhs)))))
861 (setq rhs (list (if subtract '+ '-) sel alg))
863 (setq rhs (math-simplify rhs)))
864 (setq alg (calc-encase-atoms
865 (calc-normalize (list (if subtract '- '+) alg rhs)))))
866 (calc-pop-push-record-list 1 (if subtract "sub" "add")
867 (list (calc-replace-sub-formula
870 (list (and calc-sel-reselect alg)))))
871 (calc-handle-whys))))
873 (defun calc-sel-sub-both-sides (no-simp)
875 (calc-sel-add-both-sides no-simp t))
879 ;; arch-tag: e5169792-777d-428f-bff5-acca66813fa2
880 ;;; calc-sel.el ends here