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, 2012 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 (defun calc-show-selections (arg)
315 (calc-preserve-point)
316 (setq calc-show-selections (if arg
317 (> (prefix-numeric-value arg) 0)
318 (not calc-show-selections)))
319 (let ((p calc-stack))
321 (or (null (nth 2 (car p)))
322 (equal (car p) calc-selection-cache-entry)))
325 (let ((calc-selection-cache-default-entry
326 calc-selection-cache-entry))
328 (and calc-selection-cache-entry
329 (let ((sel (nth 2 calc-selection-cache-entry)))
330 (setcar (nthcdr 2 calc-selection-cache-entry) nil)
331 (calc-change-current-selection sel)))))
332 (message (if calc-show-selections
333 "Displaying only selected part of formulas"
334 "Displaying all but selected part of formulas"))))
336 ;; The variables calc-final-point-line and calc-final-point-column
337 ;; are declared in calc.el, and are used throughout.
338 (defvar calc-final-point-line)
339 (defvar calc-final-point-column)
341 (defun calc-preserve-point ()
342 (or (looking-at "\\.\n+\\'")
344 (setq calc-final-point-line (+ (count-lines (point-min) (point))
346 calc-final-point-column (current-column))
347 (calc-set-command-flag 'position-point))))
349 (defun calc-enable-selections (arg)
352 (calc-preserve-point)
353 (setq calc-use-selections (if arg
354 (> (prefix-numeric-value arg) 0)
355 (not calc-use-selections)))
356 (calc-set-command-flag 'renum-stack)
357 (message (if calc-use-selections
358 "Commands operate only on selected sub-formulas"
359 "Selections of sub-formulas have no effect"))))
361 (defun calc-break-selections (arg)
364 (calc-preserve-point)
365 (setq calc-assoc-selections (if arg
366 (<= (prefix-numeric-value arg) 0)
367 (not calc-assoc-selections)))
368 (message (if calc-assoc-selections
369 "Selection treats a+b+c as a sum of three terms"
370 "Selection treats a+b+c as (a+b)+c"))))
372 (defun calc-prepare-selection (&optional num)
373 (or num (setq num (calc-locate-cursor-element (point))))
374 (setq calc-selection-true-num num
375 calc-keep-selection t)
376 (or (> num 0) (setq num 1))
377 ;; (if (or (< num 1) (> num (calc-stack-size)))
378 ;; (error "Cursor must be positioned on a stack element"))
379 (let* ((entry (calc-top num 'entry))
381 (or (equal entry calc-selection-cache-entry)
383 (setcar entry (calc-encase-atoms (car entry)))
384 (setq calc-selection-cache-entry entry
385 calc-selection-cache-num num
386 calc-selection-cache-comp
387 (let ((math-comp-tagged t))
388 (math-compose-expr (car entry) 0))
389 calc-selection-cache-offset
390 (+ (car (math-stack-value-offset calc-selection-cache-comp))
391 (length calc-left-label)
392 (if calc-line-numbering 4 0))))))
393 (calc-preserve-point))
395 ;;; The following ensures that no two subformulas will be "eq" to each other!
396 (defun calc-encase-atoms (x)
397 (if (or (not (consp x))
398 (equal x '(float 0 0)))
400 (calc-encase-atoms-rec x)
403 (defun calc-encase-atoms-rec (x)
406 (if (eq (car x) 'intv)
408 (while (setq x (cdr x))
409 (if (or (not (consp (car x)))
410 (equal (car x) '(float 0 0)))
411 (setcar x (list 'cplx (car x) 0))
412 (calc-encase-atoms-rec (car x)))))))
414 ;; The variable math-comp-sel-tag is local to calc-find-selected-part,
415 ;; but is used by math-comp-sel-flat-term and math-comp-add-string-sel
416 ;; in calccomp.el, which are called (indirectly) by calc-find-selected-part.
418 (defun calc-find-selected-part ()
419 (let* ((math-comp-sel-hpos (- (current-column) calc-selection-cache-offset))
423 (math-comp-sel-vpos (save-excursion
425 (let ((line (point)))
426 (calc-cursor-stack-index
427 calc-selection-cache-num)
429 (while (< (point) line)
431 (setq spaces (+ spaces
432 (current-indentation))
434 (- lcount (math-comp-ascent
435 calc-selection-cache-comp) -1))))
436 (math-comp-sel-cpos (- (point) toppt calc-selection-cache-offset
438 (math-comp-sel-tag nil))
439 (and (>= math-comp-sel-hpos 0)
440 (> calc-selection-true-num 0)
441 (math-composition-to-string calc-selection-cache-comp 1000000))
442 (nth 1 math-comp-sel-tag)))
444 (defun calc-change-current-selection (sub-expr)
445 (or (eq sub-expr (nth 2 calc-selection-cache-entry))
446 (let ((calc-prepared-composition calc-selection-cache-comp)
447 (buffer-read-only nil)
449 (calc-set-command-flag 'renum-stack)
450 (setcar (nthcdr 2 calc-selection-cache-entry) sub-expr)
451 (calc-cursor-stack-index calc-selection-cache-num)
453 (calc-cursor-stack-index (1- calc-selection-cache-num))
454 (delete-region top (point))
455 (let ((calc-selection-cache-default-entry calc-selection-cache-entry))
456 (insert (math-format-stack-value calc-selection-cache-entry)
459 (defun calc-top-selected (&optional n m)
460 (and calc-any-selections
465 (calc-check-stack (+ n m -1))
466 (let ((top (nthcdr (+ m calc-stack-top -1) calc-stack))
468 (while (>= (setq n (1- n)) 0)
469 (if (nth 2 (car top))
470 (setq sel (if sel t (nth 2 (car top)))))
471 (setq top (cdr top)))
474 ;; The variables calc-rsf-old and calc-rsf-new are local to
475 ;; calc-replace-sub-formula, but used by calc-replace-sub-formula-rec,
476 ;; which is called by calc-replace-sub-formula.
477 (defvar calc-rsf-old)
478 (defvar calc-rsf-new)
480 (defun calc-replace-sub-formula (expr calc-rsf-old calc-rsf-new)
481 (setq calc-rsf-new (calc-encase-atoms calc-rsf-new))
482 (calc-replace-sub-formula-rec expr))
484 (defun calc-replace-sub-formula-rec (expr)
485 (cond ((eq expr calc-rsf-old) calc-rsf-new)
486 ((Math-primp expr) expr)
489 (mapcar 'calc-replace-sub-formula-rec (cdr expr))))))
491 (defun calc-sel-error ()
492 (error "Invalid operation on sub-formulas"))
494 (defun calc-replace-selections (n vals m)
495 (if (calc-top-selected n m)
496 (let ((num (length vals)))
497 (calc-preserve-point)
500 (let* ((old (calc-top-list n m 'entry))
505 (if (nth 2 (car old))
506 (setq val (calc-encase-atoms (car vals))
507 new (cons (calc-replace-sub-formula (car (car old))
512 (setq new (cons (car vals) new)
514 (setq vals (cdr vals)
516 (calc-pop-stack n m t)
517 (calc-push-list (nreverse new)
518 m (and calc-keep-selection (nreverse sel)))))
520 (let* ((old (calc-top-list n m 'entry))
522 (while (and old (not (nth 2 (car old))))
523 (setq old (cdr old)))
525 (while (and (setq more (cdr more)) (not (nth 2 (car more)))))
528 (calc-pop-stack n m t)
530 (let ((val (calc-encase-atoms (car vals))))
531 (calc-push-list (list (calc-replace-sub-formula
535 m (and calc-keep-selection (list val))))
536 (calc-push-list vals))))
537 (t (calc-sel-error))))
538 (calc-pop-stack n m t)
539 (calc-push-list vals m)))
541 (defun calc-delete-selection (n)
542 (let ((entry (calc-top n 'entry)))
544 (if (eq (nth 2 entry) (car entry))
546 (calc-pop-stack 1 n t)
547 (calc-push-list '(0) n))
548 (let ((parent (calc-find-parent-formula (car entry) (nth 2 entry)))
550 (calc-preserve-point)
551 (calc-pop-stack 1 n t)
552 (cond ((or (memq (car parent) '(* / %))
553 (and (eq (car parent) '^)
554 (eq (nth 2 parent) (nth 2 entry))))
556 ((memq (car parent) '(vec calcFunc-min calcFunc-max)))
557 ((and (assq (car parent) calc-tweak-eqn-table)
558 (= (length parent) 3))
564 (calc-push-list (list
566 (calc-replace-sub-formula
569 (if (eq (nth 2 entry) (nth 1 parent))
574 (calc-push-list (list
576 (calc-replace-sub-formula (car entry)
581 (calc-push-list (list
583 (calc-replace-sub-formula (car entry)
589 (calc-pop-stack 1 n t))))
591 (defun calc-roll-down-with-selections (n m)
592 (let ((vals (append (calc-top-list m 1)
593 (calc-top-list (- n m) (1+ m))))
594 (sels (append (calc-top-list m 1 'sel)
595 (calc-top-list (- n m) (1+ m) 'sel))))
596 (calc-pop-push-list n vals 1 sels)))
598 (defun calc-roll-up-with-selections (n m)
599 (let ((vals (append (calc-top-list (- n m) 1)
600 (calc-top-list m (- n m -1))))
601 (sels (append (calc-top-list (- n m) 1 'sel)
602 (calc-top-list m (- n m -1) 'sel))))
603 (calc-pop-push-list n vals 1 sels)))
605 ;; The variable calc-sel-reselect is local to several functions
606 ;; which call calc-auto-selection.
607 (defvar calc-sel-reselect)
609 (defun calc-auto-selection (entry)
612 (setq calc-sel-reselect nil)
613 (calc-prepare-selection)
614 (calc-grow-assoc-formula (car entry) (calc-find-selected-part)))))
616 (defun calc-copy-selection ()
619 (calc-preserve-point)
620 (let* ((num (max 1 (calc-locate-cursor-element (point))))
621 (entry (calc-top num 'entry)))
622 (calc-push (or (calc-auto-selection entry) (car entry))))))
624 (defun calc-del-selection ()
627 (calc-preserve-point)
628 (let* ((num (max 1 (calc-locate-cursor-element (point))))
629 (entry (calc-top num 'entry))
630 (sel (calc-auto-selection entry)))
631 (setcar (nthcdr 2 entry) (and (not (eq sel (car entry))) sel))
632 (calc-delete-selection num))))
634 (defvar calc-selection-history nil
635 "History for calc selections.")
637 (defun calc-enter-selection ()
640 (calc-preserve-point)
641 (let* ((num (max 1 (calc-locate-cursor-element (point))))
642 (calc-sel-reselect calc-keep-selection)
643 (entry (calc-top num 'entry))
645 (sel (or (calc-auto-selection entry) expr))
647 (let ((calc-dollar-values (list sel))
648 (calc-dollar-used 0))
649 (setq alg (calc-do-alg-entry "" "Replace selection with: " nil
650 'calc-selection-history))
653 (setq alg (calc-encase-atoms (car alg)))
654 (calc-pop-push-record-list 1 "repl"
655 (list (calc-replace-sub-formula
658 (list (and calc-sel-reselect alg))))))
659 (calc-handle-whys))))
661 (defun calc-edit-selection ()
664 (calc-preserve-point)
665 (let* ((num (max 1 (calc-locate-cursor-element (point))))
666 (calc-sel-reselect calc-keep-selection)
667 (entry (calc-top num 'entry))
669 (sel (or (calc-auto-selection entry) expr))
671 (let ((str (math-showing-full-precision
672 (math-format-nice-expr sel (frame-width)))))
673 (calc-edit-mode (list 'calc-finish-selection-edit
674 num (list 'quote sel) calc-sel-reselect))
676 (calc-show-edit-buffer))
678 (defvar calc-original-buffer)
680 ;; The variable calc-edit-disp-trail is local to calc-edit-finish,
682 (defvar calc-edit-disp-trail)
683 (defvar calc-edit-top)
685 (defun calc-finish-selection-edit (num sel reselect)
686 (let ((buf (current-buffer))
687 (str (buffer-substring calc-edit-top (point-max)))
689 (switch-to-buffer calc-original-buffer)
690 (let ((val (math-read-expr str)))
691 (if (eq (car-safe val) 'error)
693 (switch-to-buffer buf)
694 (goto-char (+ start (nth 1 val)))
695 (error (nth 2 val))))
697 (calc-preserve-point)
698 (if calc-edit-disp-trail
699 (calc-trail-display 1 t))
700 (setq val (calc-encase-atoms (calc-normalize val)))
701 (let ((expr (calc-top num 'full)))
702 (if (calc-find-sub-formula expr sel)
703 (calc-pop-push-record-list 1 "edit"
704 (list (calc-replace-sub-formula
707 (list (and reselect val)))
709 (error "Original selection has been lost")))))))
711 (defun calc-sel-evaluate (arg)
714 (calc-preserve-point)
715 (let* ((num (max 1 (calc-locate-cursor-element (point))))
716 (calc-sel-reselect calc-keep-selection)
717 (entry (calc-top num 'entry))
718 (sel (or (calc-auto-selection entry) (car entry))))
719 (calc-with-default-simplification
720 (let ((math-simplify-only nil))
721 (calc-modify-simplify-mode arg)
722 (let ((val (calc-encase-atoms (calc-normalize sel))))
723 (calc-pop-push-record-list 1 "jsmp"
724 (list (calc-replace-sub-formula
725 (car entry) sel val))
727 (list (and calc-sel-reselect val))))))
728 (calc-handle-whys))))
730 (defun calc-sel-expand-formula (arg)
733 (calc-preserve-point)
734 (let* ((num (max 1 (calc-locate-cursor-element (point))))
735 (calc-sel-reselect calc-keep-selection)
736 (entry (calc-top num 'entry))
737 (sel (or (calc-auto-selection entry) (car entry))))
738 (calc-with-default-simplification
739 (let ((math-simplify-only nil))
740 (calc-modify-simplify-mode arg)
741 (let* ((math-expand-formulas (> arg 0))
742 (val (calc-normalize sel))
745 (setq top (math-expand-formula val))
746 (setq val (calc-normalize top)))
747 (setq val (calc-encase-atoms val))
748 (calc-pop-push-record-list 1 "jexf"
749 (list (calc-replace-sub-formula
750 (car entry) sel val))
752 (list (and calc-sel-reselect val))))))
753 (calc-handle-whys))))
755 (defun calc-sel-mult-both-sides (arg &optional divide)
758 (calc-preserve-point)
759 (let* ((no-simp (consp arg))
760 (num (max 1 (calc-locate-cursor-element (point))))
761 (calc-sel-reselect calc-keep-selection)
762 (entry (calc-top num 'entry))
764 (sel (or (calc-auto-selection entry) expr))
765 (func (car-safe sel))
767 (setq alg (calc-with-default-simplification
768 (car (calc-do-alg-entry ""
770 "Divide both sides by: "
771 "Multiply both sides by: ")
772 nil 'calc-selection-history))))
775 (if (and (or (eq func '/)
776 (assq func calc-tweak-eqn-table))
779 (or (memq func '(/ calcFunc-eq calcFunc-neq))
780 (if (math-known-nonposp alg)
782 (setq func (nth 1 (assq func
783 calc-tweak-eqn-table)))
784 (or (math-known-negp alg)
785 (message "Assuming this factor is nonzero")))
786 (or (math-known-posp alg)
787 (if (math-known-nonnegp alg)
788 (message "Assuming this factor is nonzero")
789 (message "Assuming this factor is positive")))))
790 (setq lhs (list (if divide '/ '*) (nth 1 sel) alg)
791 rhs (list (if divide '/ '*) (nth 2 sel) alg))
794 (setq lhs (math-simplify lhs)
795 rhs (math-simplify rhs))
797 (or (Math-equal (nth 1 sel) 1)
798 (Math-equal (nth 1 sel) -1))
799 ; (and (memq (car-safe (nth 2 sel)) '(+ -))
800 ; (memq (car-safe alg) '(+ -))))
802 (setq rhs (math-expand-term rhs))))))
803 (if (and arg (not no-simp))
804 (setq rhs (math-simplify
805 (calcFunc-expand rhs (unless (= arg 0) arg)))))
806 (setq alg (calc-encase-atoms
807 (calc-normalize (list func lhs rhs)))))
808 (setq rhs (list (if divide '* '/) sel alg))
810 (setq rhs (math-simplify rhs)))
811 (setq alg (calc-encase-atoms
812 (calc-normalize (if divide
814 (list '* alg rhs))))))
815 (calc-pop-push-record-list 1 (if divide "div" "mult")
816 (list (calc-replace-sub-formula
819 (list (and calc-sel-reselect alg)))))
820 (calc-handle-whys))))
822 (defun calc-sel-div-both-sides (no-simp)
824 (calc-sel-mult-both-sides no-simp t))
826 (defun calc-sel-add-both-sides (no-simp &optional subtract)
829 (calc-preserve-point)
830 (let* ((num (max 1 (calc-locate-cursor-element (point))))
831 (calc-sel-reselect calc-keep-selection)
832 (entry (calc-top num 'entry))
834 (sel (or (calc-auto-selection entry) expr))
835 (func (car-safe sel))
837 (setq alg (calc-with-default-simplification
838 (car (calc-do-alg-entry ""
840 "Subtract from both sides: "
841 "Add to both sides: ")
842 nil 'calc-selection-history))))
845 (if (and (assq func calc-tweak-eqn-table)
848 (setq lhs (list (if subtract '- '+) (nth 1 sel) alg)
849 rhs (list (if subtract '- '+) (nth 2 sel) alg))
851 (setq lhs (math-simplify lhs)
852 rhs (math-simplify rhs)))
853 (setq alg (calc-encase-atoms
854 (calc-normalize (list func lhs rhs)))))
855 (setq rhs (list (if subtract '+ '-) sel alg))
857 (setq rhs (math-simplify rhs)))
858 (setq alg (calc-encase-atoms
859 (calc-normalize (list (if subtract '- '+) alg rhs)))))
860 (calc-pop-push-record-list 1 (if subtract "sub" "add")
861 (list (calc-replace-sub-formula
864 (list (and calc-sel-reselect alg)))))
865 (calc-handle-whys))))
867 (defun calc-sel-sub-both-sides (no-simp)
869 (calc-sel-add-both-sides no-simp t))
873 ;; arch-tag: e5169792-777d-428f-bff5-acca66813fa2
874 ;;; calc-sel.el ends here