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emacs/lisp/calc/calc-sel.el
Paul Eggert 365e01cc9f Update copyright year to 2020 
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2020-01-01 00:59:52 +00:00

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;;; calc-sel.el --- data selection functions for Calc
;; Copyright (C) 1990-1993, 2001-2020 Free Software Foundation, Inc.
;; Author: David Gillespie <daveg@synaptics.com>
;; 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
;; This file is autoloaded from calc-ext.el.
(require 'calc-ext)
(require 'calc-macs)
;;; Selection commands.
(defvar calc-keep-selection t)
(defvar calc-selection-cache-entry nil)
(defvar calc-selection-cache-num)
(defvar calc-selection-cache-comp)
(defvar calc-selection-cache-offset)
(defvar calc-selection-true-num)
(defun calc-select-here (num &optional once keep)
(interactive "P")
(calc-wrapper
(calc-prepare-selection)
(let ((found (calc-find-selected-part))
(entry calc-selection-cache-entry))
(or (and keep (nth 2 entry))
(progn
(if once (progn
(setq calc-keep-selection nil)
(message "(Selection will apply to next command only)")))
(calc-change-current-selection
(if found
(if (and num (> (setq num (prefix-numeric-value num)) 0))
(progn
(while (and (>= (setq num (1- num)) 0)
(not (eq found (car entry))))
(setq found (calc-find-assoc-parent-formula
(car entry) found)))
found)
(calc-grow-assoc-formula (car entry) found))
(car entry))))))))
(defun calc-select-once (num)
(interactive "P")
(calc-select-here num t))
(defun calc-select-here-maybe (num)
(interactive "P")
(calc-select-here num nil t))
(defun calc-select-once-maybe (num)
(interactive "P")
(calc-select-here num t t))
(defun calc-select-additional ()
(interactive)
(calc-wrapper
(let (calc-keep-selection)
(calc-prepare-selection))
(let ((found (calc-find-selected-part))
(entry calc-selection-cache-entry))
(calc-change-current-selection
(if found
(let ((sel (nth 2 entry)))
(if sel
(progn
(while (not (or (eq sel (car entry))
(calc-find-sub-formula sel found)))
(setq sel (calc-find-assoc-parent-formula
(car entry) sel)))
sel)
(calc-grow-assoc-formula (car entry) found)))
(car entry))))))
(defun calc-select-more (num)
(interactive "P")
(calc-wrapper
(calc-prepare-selection)
(let ((entry calc-selection-cache-entry))
(if (nth 2 entry)
(let ((sel (nth 2 entry)))
(while (and (not (eq sel (car entry)))
(>= (setq num (1- (prefix-numeric-value num))) 0))
(setq sel (calc-find-assoc-parent-formula (car entry) sel)))
(calc-change-current-selection sel))
(calc-select-here num)))))
(defun calc-select-less (num)
(interactive "p")
(calc-wrapper
(calc-prepare-selection)
(let ((found (calc-find-selected-part))
(entry calc-selection-cache-entry))
(calc-change-current-selection
(and found
(let ((sel (nth 2 entry))
old index op)
(while (and sel
(not (eq sel found))
(>= (setq num (1- num)) 0))
(setq old sel
index (calc-find-sub-formula sel found))
(and (setq sel (and index (nth index old)))
calc-assoc-selections
(setq op (assq (car-safe sel) calc-assoc-ops))
(memq (car old) (nth index op))
(setq num (1+ num))))
sel))))))
(defun calc-select-part (num)
(interactive "P")
(or num (setq num (- last-command-event ?0)))
(calc-wrapper
(calc-prepare-selection)
(let ((sel (calc-find-nth-part (or (nth 2 calc-selection-cache-entry)
(car calc-selection-cache-entry))
num)))
(if sel
(calc-change-current-selection sel)
(error "%d is not a valid sub-formula index" num)))))
;; The variables calc-fnp-op and calc-fnp-num are local to
;; calc-find-nth-part (and calc-select-previous) but used by
;; calc-find-nth-part-rec, which is called by them.
(defvar calc-fnp-op)
(defvar calc-fnp-num)
(defun calc-find-nth-part (expr calc-fnp-num)
(if (and calc-assoc-selections
(assq (car-safe expr) calc-assoc-ops))
(let (calc-fnp-op)
(calc-find-nth-part-rec expr))
(if (eq (car-safe expr) 'intv)
(and (>= calc-fnp-num 1) (<= calc-fnp-num 2) (nth (1+ calc-fnp-num) expr))
(and (not (Math-primp expr)) (>= calc-fnp-num 1) (< calc-fnp-num (length expr))
(nth calc-fnp-num expr)))))
(defun calc-find-nth-part-rec (expr) ; uses num, op
(or (if (and (setq calc-fnp-op (assq (car-safe (nth 1 expr)) calc-assoc-ops))
(memq (car expr) (nth 1 calc-fnp-op)))
(calc-find-nth-part-rec (nth 1 expr))
(and (= (setq calc-fnp-num (1- calc-fnp-num)) 0)
(nth 1 expr)))
(if (and (setq calc-fnp-op (assq (car-safe (nth 2 expr)) calc-assoc-ops))
(memq (car expr) (nth 2 calc-fnp-op)))
(calc-find-nth-part-rec (nth 2 expr))
(and (= (setq calc-fnp-num (1- calc-fnp-num)) 0)
(nth 2 expr)))))
(defun calc-select-next (num)
(interactive "p")
(if (< num 0)
(calc-select-previous (- num))
(calc-wrapper
(calc-prepare-selection)
(let* ((entry calc-selection-cache-entry)
(sel (nth 2 entry)))
(if sel
(progn
(while (>= (setq num (1- num)) 0)
(let* ((parent (calc-find-parent-formula (car entry) sel))
(p parent)
op)
(and (eq p t) (setq p nil))
(while (and (setq p (cdr p))
(not (eq (car p) sel))))
(if (cdr p)
(setq sel (or (and calc-assoc-selections
(setq op (assq (car-safe (nth 1 p))
calc-assoc-ops))
(memq (car parent) (nth 2 op))
(nth 1 (nth 1 p)))
(nth 1 p)))
(if (and calc-assoc-selections
(setq op (assq (car-safe parent) calc-assoc-ops))
(consp (setq p (calc-find-parent-formula
(car entry) parent)))
(eq (nth 1 p) parent)
(memq (car p) (nth 1 op)))
(setq sel (nth 2 p))
(error "No \"next\" sub-formula")))))
(calc-change-current-selection sel))
(if (Math-primp (car entry))
(calc-change-current-selection (car entry))
(calc-select-part num)))))))
(defun calc-select-previous (num)
(interactive "p")
(if (< num 0)
(calc-select-next (- num))
(calc-wrapper
(calc-prepare-selection)
(let* ((entry calc-selection-cache-entry)
(sel (nth 2 entry)))
(if sel
(progn
(while (>= (setq num (1- num)) 0)
(let* ((parent (calc-find-parent-formula (car entry) sel))
(p (cdr-safe parent))
(prev nil)
op)
(if (eq (car-safe parent) 'intv) (setq p (cdr p)))
(while (and (not (eq (car p) sel))
(setq prev (car p)
p (cdr p))))
(if prev
(setq sel (or (and calc-assoc-selections
(setq op (assq (car-safe prev)
calc-assoc-ops))
(memq (car parent) (nth 1 op))
(nth 2 prev))
prev))
(if (and calc-assoc-selections
(setq op (assq (car-safe parent) calc-assoc-ops))
(consp (setq p (calc-find-parent-formula
(car entry) parent)))
(eq (nth 2 p) parent)
(memq (car p) (nth 2 op)))
(setq sel (nth 1 p))
(error "No \"previous\" sub-formula")))))
(calc-change-current-selection sel))
(if (Math-primp (car entry))
(calc-change-current-selection (car entry))
(let ((len (if (and calc-assoc-selections
(assq (car (car entry)) calc-assoc-ops))
(let (calc-fnp-op (calc-fnp-num 0))
(calc-find-nth-part-rec (car entry))
(- 1 calc-fnp-num))
(length (car entry)))))
(calc-select-part (- len num)))))))))
(defun calc-find-parent-formula (expr part)
(cond ((eq expr part) t)
((Math-primp expr) nil)
(t
(let ((p expr) res)
(while (and (setq p (cdr p))
(not (setq res (calc-find-parent-formula
(car p) part)))))
(and p
(if (eq res t) expr res))))))
(defun calc-find-assoc-parent-formula (expr part)
(calc-grow-assoc-formula expr (calc-find-parent-formula expr part)))
(defun calc-grow-assoc-formula (expr part)
(if calc-assoc-selections
(let ((op (assq (car-safe part) calc-assoc-ops)))
(if op
(let (new)
(while (and (consp (setq new (calc-find-parent-formula
expr part)))
(memq (car new)
(nth (calc-find-sub-formula new part) op)))
(setq part new))))
part)
part))
(defun calc-find-sub-formula (expr part)
(cond ((eq expr part) t)
((Math-primp expr) nil)
(t
(let ((num 1))
(while (and (setq expr (cdr expr))
(not (calc-find-sub-formula (car expr) part)))
(setq num (1+ num)))
(and expr num)))))
(defun calc-unselect (num)
(interactive "P")
(calc-wrapper
(calc-prepare-selection num)
(calc-change-current-selection nil)))
(defun calc-clear-selections ()
(interactive)
(calc-wrapper
(let ((limit (calc-stack-size))
(n 1))
(while (<= n limit)
(if (calc-top n 'sel)
(progn
(calc-prepare-selection n)
(calc-change-current-selection nil)))
(setq n (1+ n))))
(calc-clear-command-flag 'position-point)))
(defvar calc-highlight-selections-with-faces)
(defun calc-show-selections (arg)
(interactive "P")
(calc-wrapper
(calc-preserve-point)
(setq calc-show-selections (if arg
(> (prefix-numeric-value arg) 0)
(not calc-show-selections)))
(let ((p calc-stack))
(while (and p
(or (null (nth 2 (car p)))
(equal (car p) calc-selection-cache-entry)))
(setq p (cdr p)))
(or (and p
(let ((calc-selection-cache-default-entry
calc-selection-cache-entry))
(calc-do-refresh)))
(and calc-selection-cache-entry
(let ((sel (nth 2 calc-selection-cache-entry)))
(setcar (nthcdr 2 calc-selection-cache-entry) nil)
(calc-change-current-selection sel)))))
(message (if calc-show-selections
(if calc-highlight-selections-with-faces
"De-emphasizing all but selected part of formulas"
"Displaying only selected part of formulas")
(if calc-highlight-selections-with-faces
"Emphasizing selected part of formulas"
"Displaying all but selected part of formulas")))))
;; The variables calc-final-point-line and calc-final-point-column
;; are declared in calc.el, and are used throughout.
(defvar calc-final-point-line)
(defvar calc-final-point-column)
(defun calc-preserve-point ()
(or (looking-at "\\.\n+\\'")
(progn
(setq calc-final-point-line (+ (count-lines (point-min) (point))
(if (bolp) 1 0))
calc-final-point-column (current-column))
(calc-set-command-flag 'position-point))))
(defun calc-enable-selections (arg)
(interactive "P")
(calc-wrapper
(calc-preserve-point)
(setq calc-use-selections (if arg
(> (prefix-numeric-value arg) 0)
(not calc-use-selections)))
(calc-set-command-flag 'renum-stack)
(message (if calc-use-selections
"Commands operate only on selected sub-formulas"
"Selections of sub-formulas have no effect"))))
(defun calc-break-selections (arg)
(interactive "P")
(calc-wrapper
(calc-preserve-point)
(setq calc-assoc-selections (if arg
(<= (prefix-numeric-value arg) 0)
(not calc-assoc-selections)))
(message (if calc-assoc-selections
"Selection treats a+b+c as a sum of three terms"
"Selection treats a+b+c as (a+b)+c"))))
(defun calc-prepare-selection (&optional num)
(or num (setq num (calc-locate-cursor-element (point))))
(setq calc-selection-true-num num
calc-keep-selection t)
(or (> num 0) (setq num 1))
;; (if (or (< num 1) (> num (calc-stack-size)))
;; (error "Cursor must be positioned on a stack element"))
(let* ((entry (calc-top num 'entry))
ww w)
(or (equal entry calc-selection-cache-entry)
(progn
(setcar entry (calc-encase-atoms (car entry)))
(setq calc-selection-cache-entry entry
calc-selection-cache-num num
calc-selection-cache-comp
(let ((math-comp-tagged t))
(math-compose-expr (car entry) 0))
calc-selection-cache-offset
(+ (car (math-stack-value-offset calc-selection-cache-comp))
(length calc-left-label)
(if calc-line-numbering 4 0))))))
(calc-preserve-point))
;;; The following ensures that no two subformulas will be "eq" to each other!
(defun calc-encase-atoms (x)
(if (or (not (consp x))
(equal x '(float 0 0)))
(list 'cplx x 0)
(calc-encase-atoms-rec x)
x))
(defun calc-encase-atoms-rec (x)
(or (Math-primp x)
(progn
(if (eq (car x) 'intv)
(setq x (cdr x)))
(while (setq x (cdr x))
(if (or (not (consp (car x)))
(equal (car x) '(float 0 0)))
(setcar x (list 'cplx (car x) 0))
(calc-encase-atoms-rec (car x)))))))
;; The variable math-comp-sel-tag is local to calc-find-selected-part,
;; but is used by math-comp-sel-flat-term and math-comp-add-string-sel
;; in calccomp.el, which are called (indirectly) by calc-find-selected-part.
(defun calc-find-selected-part ()
(let* ((math-comp-sel-hpos (- (current-column) calc-selection-cache-offset))
toppt
(lcount 0)
(spaces 0)
(math-comp-sel-vpos (save-excursion
(beginning-of-line)
(let ((line (point)))
(calc-cursor-stack-index
calc-selection-cache-num)
(setq toppt (point))
(while (< (point) line)
(forward-line 1)
(setq spaces (+ spaces
(current-indentation))
lcount (1+ lcount)))
(- lcount (math-comp-ascent
calc-selection-cache-comp) -1))))
(math-comp-sel-cpos (- (point) toppt calc-selection-cache-offset
spaces lcount))
(math-comp-sel-tag nil))
(and (>= math-comp-sel-hpos 0)
(> calc-selection-true-num 0)
(math-composition-to-string calc-selection-cache-comp 1000000))
(nth 1 math-comp-sel-tag)))
(defun calc-change-current-selection (sub-expr)
(or (eq sub-expr (nth 2 calc-selection-cache-entry))
(let ((calc-prepared-composition calc-selection-cache-comp)
(buffer-read-only nil)
top)
(calc-set-command-flag 'renum-stack)
(setcar (nthcdr 2 calc-selection-cache-entry) sub-expr)
(calc-cursor-stack-index calc-selection-cache-num)
(setq top (point))
(calc-cursor-stack-index (1- calc-selection-cache-num))
(delete-region top (point))
(let ((calc-selection-cache-default-entry calc-selection-cache-entry))
(insert (math-format-stack-value calc-selection-cache-entry)
"\n")))))
(defun calc-top-selected (&optional n m)
(and calc-any-selections
calc-use-selections
(progn
(or n (setq n 1))
(or m (setq m 1))
(calc-check-stack (+ n m -1))
(let ((top (nthcdr (+ m calc-stack-top -1) calc-stack))
(sel nil))
(while (>= (setq n (1- n)) 0)
(if (nth 2 (car top))
(setq sel (if sel t (nth 2 (car top)))))
(setq top (cdr top)))
sel))))
;; The variables calc-rsf-old and calc-rsf-new are local to
;; calc-replace-sub-formula, but used by calc-replace-sub-formula-rec,
;; which is called by calc-replace-sub-formula.
(defvar calc-rsf-old)
(defvar calc-rsf-new)
(defun calc-replace-sub-formula (expr calc-rsf-old calc-rsf-new)
(setq calc-rsf-new (calc-encase-atoms calc-rsf-new))
(calc-replace-sub-formula-rec expr))
(defun calc-replace-sub-formula-rec (expr)
(cond ((eq expr calc-rsf-old) calc-rsf-new)
((Math-primp expr) expr)
(t
(cons (car expr)
(mapcar 'calc-replace-sub-formula-rec (cdr expr))))))
(defun calc-sel-error ()
(error "Invalid operation on sub-formulas"))
(defun calc-replace-selections (n vals m)
(if (calc-top-selected n m)
(let ((num (length vals)))
(calc-preserve-point)
(cond
((= n num)
(let* ((old (calc-top-list n m 'entry))
(new nil)
(sel nil)
val)
(while old
(if (nth 2 (car old))
(setq val (calc-encase-atoms (car vals))
new (cons (calc-replace-sub-formula (car (car old))
(nth 2 (car old))
val)
new)
sel (cons val sel))
(setq new (cons (car vals) new)
sel (cons nil sel)))
(setq vals (cdr vals)
old (cdr old)))
(calc-pop-stack n m t)
(calc-push-list (nreverse new)
m (and calc-keep-selection (nreverse sel)))))
((= num 1)
(let* ((old (calc-top-list n m 'entry))
more)
(while (and old (not (nth 2 (car old))))
(setq old (cdr old)))
(setq more old)
(while (and (setq more (cdr more)) (not (nth 2 (car more)))))
(and more
(calc-sel-error))
(calc-pop-stack n m t)
(if old
(let ((val (calc-encase-atoms (car vals))))
(calc-push-list (list (calc-replace-sub-formula
(car (car old))
(nth 2 (car old))
val))
m (and calc-keep-selection (list val))))
(calc-push-list vals))))
(t (calc-sel-error))))
(calc-pop-stack n m t)
(calc-push-list vals m)))
(defun calc-delete-selection (n)
(let ((entry (calc-top n 'entry)))
(if (nth 2 entry)
(if (eq (nth 2 entry) (car entry))
(progn
(calc-pop-stack 1 n t)
(calc-push-list '(0) n))
(let ((parent (calc-find-parent-formula (car entry) (nth 2 entry)))
(repl nil))
(calc-preserve-point)
(calc-pop-stack 1 n t)
(cond ((or (memq (car parent) '(* / %))
(and (eq (car parent) '^)
(eq (nth 2 parent) (nth 2 entry))))
(setq repl 1))
((memq (car parent) '(vec calcFunc-min calcFunc-max)))
((and (assq (car parent) calc-tweak-eqn-table)
(= (length parent) 3))
(setq repl 'del))
(t
(setq repl 0)))
(cond
((eq repl 'del)
(calc-push-list (list
(calc-normalize
(calc-replace-sub-formula
(car entry)
parent
(if (eq (nth 2 entry) (nth 1 parent))
(nth 2 parent)
(nth 1 parent)))))
n))
(repl
(calc-push-list (list
(calc-normalize
(calc-replace-sub-formula (car entry)
(nth 2 entry)
repl)))
n))
(t
(calc-push-list (list
(calc-normalize
(calc-replace-sub-formula (car entry)
parent
(delq (nth 2 entry)
(copy-sequence
parent)))))
n)))))
(calc-pop-stack 1 n t))))
(defun calc-roll-down-with-selections (n m)
(let ((vals (append (calc-top-list m 1)
(calc-top-list (- n m) (1+ m))))
(sels (append (calc-top-list m 1 'sel)
(calc-top-list (- n m) (1+ m) 'sel))))
(calc-pop-push-list n vals 1 sels)))
(defun calc-roll-up-with-selections (n m)
(let ((vals (append (calc-top-list (- n m) 1)
(calc-top-list m (- n m -1))))
(sels (append (calc-top-list (- n m) 1 'sel)
(calc-top-list m (- n m -1) 'sel))))
(calc-pop-push-list n vals 1 sels)))
;; The variable calc-sel-reselect is local to several functions
;; which call calc-auto-selection.
(defvar calc-sel-reselect)
(defun calc-auto-selection (entry)
(or (nth 2 entry)
(progn
(setq calc-sel-reselect nil)
(calc-prepare-selection)
(calc-grow-assoc-formula (car entry) (calc-find-selected-part)))))
(defun calc-copy-selection ()
(interactive)
(calc-wrapper
(calc-preserve-point)
(let* ((num (max 1 (calc-locate-cursor-element (point))))
(entry (calc-top num 'entry)))
(calc-push (or (calc-auto-selection entry) (car entry))))))
(defun calc-del-selection ()
(interactive)
(calc-wrapper
(calc-preserve-point)
(let* ((num (max 1 (calc-locate-cursor-element (point))))
(entry (calc-top num 'entry))
(sel (calc-auto-selection entry)))
(setcar (nthcdr 2 entry) (and (not (eq sel (car entry))) sel))
(calc-delete-selection num))))
(defvar calc-selection-history nil
"History for calc selections.")
(defun calc-enter-selection ()
(interactive)
(calc-wrapper
(calc-preserve-point)
(let* ((num (max 1 (calc-locate-cursor-element (point))))
(calc-sel-reselect calc-keep-selection)
(entry (calc-top num 'entry))
(expr (car entry))
(sel (or (calc-auto-selection entry) expr))
alg)
(let ((calc-dollar-values (list sel))
(calc-dollar-used 0))
(setq alg (calc-do-alg-entry "" "Replace selection with: " nil
'calc-selection-history))
(and alg
(progn
(setq alg (calc-encase-atoms (car alg)))
(calc-pop-push-record-list 1 "repl"
(list (calc-replace-sub-formula
expr sel alg))
num
(list (and calc-sel-reselect alg))))))
(calc-handle-whys))))
(defun calc-edit-selection ()
(interactive)
(calc-wrapper
(calc-preserve-point)
(let* ((num (max 1 (calc-locate-cursor-element (point))))
(calc-sel-reselect calc-keep-selection)
(entry (calc-top num 'entry))
(expr (car entry))
(sel (or (calc-auto-selection entry) expr))
alg)
(let ((str (math-showing-full-precision
(math-format-nice-expr sel (frame-width)))))
(calc-edit-mode (list 'calc-finish-selection-edit
num (list 'quote sel) calc-sel-reselect))
(insert str "\n"))))
(calc-show-edit-buffer))
(defvar calc-original-buffer)
;; The variable calc-edit-disp-trail is local to calc-edit-finish,
;; in calc-yank.el.
(defvar calc-edit-disp-trail)
(defvar calc-edit-top)
(defun calc-finish-selection-edit (num sel reselect)
(let ((buf (current-buffer))
(str (buffer-substring calc-edit-top (point-max)))
(start (point)))
(switch-to-buffer calc-original-buffer)
(let ((val (math-read-expr str)))
(if (eq (car-safe val) 'error)
(progn
(switch-to-buffer buf)
(goto-char (+ start (nth 1 val)))
(error (nth 2 val))))
(calc-wrapper
(calc-preserve-point)
(if calc-edit-disp-trail
(calc-trail-display 1 t))
(setq val (calc-encase-atoms (calc-normalize val)))
(let ((expr (calc-top num 'full)))
(if (calc-find-sub-formula expr sel)
(calc-pop-push-record-list 1 "edit"
(list (calc-replace-sub-formula
expr sel val))
num
(list (and reselect val)))
(calc-push val)
(error "Original selection has been lost")))))))
(defun calc-sel-evaluate (arg)
(interactive "p")
(calc-slow-wrapper
(calc-preserve-point)
(let* ((num (max 1 (calc-locate-cursor-element (point))))
(calc-sel-reselect calc-keep-selection)
(entry (calc-top num 'entry))
(sel (or (calc-auto-selection entry) (car entry))))
(calc-with-default-simplification
(let ((math-simplify-only nil))
(calc-modify-simplify-mode arg)
(let ((val (calc-encase-atoms (calc-normalize sel))))
(calc-pop-push-record-list 1 "jsmp"
(list (calc-replace-sub-formula
(car entry) sel val))
num
(list (and calc-sel-reselect val))))))
(calc-handle-whys))))
(defun calc-sel-expand-formula (arg)
(interactive "p")
(calc-slow-wrapper
(calc-preserve-point)
(let* ((num (max 1 (calc-locate-cursor-element (point))))
(calc-sel-reselect calc-keep-selection)
(entry (calc-top num 'entry))
(sel (or (calc-auto-selection entry) (car entry))))
(calc-with-default-simplification
(let ((math-simplify-only nil))
(calc-modify-simplify-mode arg)
(let* ((math-expand-formulas (> arg 0))
(val (calc-normalize sel))
top)
(and (<= arg 0)
(setq top (math-expand-formula val))
(setq val (calc-normalize top)))
(setq val (calc-encase-atoms val))
(calc-pop-push-record-list 1 "jexf"
(list (calc-replace-sub-formula
(car entry) sel val))
num
(list (and calc-sel-reselect val))))))
(calc-handle-whys))))
(defun calc-sel-mult-both-sides (arg &optional divide)
(interactive "P")
(calc-wrapper
(calc-preserve-point)
(let* ((no-simp (consp arg))
(num (max 1 (calc-locate-cursor-element (point))))
(calc-sel-reselect calc-keep-selection)
(entry (calc-top num 'entry))
(expr (car entry))
(sel (or (calc-auto-selection entry) expr))
(func (car-safe sel))
alg lhs rhs)
(setq alg (calc-with-default-simplification
(car (calc-do-alg-entry ""
(if divide
"Divide both sides by: "
"Multiply both sides by: ")
nil 'calc-selection-history))))
(and alg
(progn
(if (and (or (eq func '/)
(assq func calc-tweak-eqn-table))
(= (length sel) 3))
(progn
(or (memq func '(/ calcFunc-eq calcFunc-neq))
(if (math-known-nonposp alg)
(progn
(setq func (nth 1 (assq func
calc-tweak-eqn-table)))
(or (math-known-negp alg)
(message "Assuming this factor is nonzero")))
(or (math-known-posp alg)
(if (math-known-nonnegp alg)
(message "Assuming this factor is nonzero")
(message "Assuming this factor is positive")))))
(setq lhs (list (if divide '/ '*) (nth 1 sel) alg)
rhs (list (if divide '/ '*) (nth 2 sel) alg))
(or no-simp
(progn
(setq lhs (math-simplify lhs)
rhs (math-simplify rhs))
(and (eq func '/)
(or (Math-equal (nth 1 sel) 1)
(Math-equal (nth 1 sel) -1))
; (and (memq (car-safe (nth 2 sel)) '(+ -))
; (memq (car-safe alg) '(+ -))))
(unless arg
(setq rhs (math-expand-term rhs))))))
(if (and arg (not no-simp))
(setq rhs (math-simplify
(calcFunc-expand rhs (unless (= arg 0) arg)))))
(setq alg (calc-encase-atoms
(calc-normalize (list func lhs rhs)))))
(setq rhs (list (if divide '* '/) sel alg))
(or no-simp
(setq rhs (math-simplify rhs)))
(setq alg (calc-encase-atoms
(calc-normalize (if divide
(list '/ rhs alg)
(list '* alg rhs))))))
(calc-pop-push-record-list 1 (if divide "div" "mult")
(list (calc-replace-sub-formula
expr sel alg))
num
(list (and calc-sel-reselect alg)))))
(calc-handle-whys))))
(defun calc-sel-div-both-sides (no-simp)
(interactive "P")
(calc-sel-mult-both-sides no-simp t))
(defun calc-sel-add-both-sides (no-simp &optional subtract)
(interactive "P")
(calc-wrapper
(calc-preserve-point)
(let* ((num (max 1 (calc-locate-cursor-element (point))))
(calc-sel-reselect calc-keep-selection)
(entry (calc-top num 'entry))
(expr (car entry))
(sel (or (calc-auto-selection entry) expr))
(func (car-safe sel))
alg lhs rhs)
(setq alg (calc-with-default-simplification
(car (calc-do-alg-entry ""
(if subtract
"Subtract from both sides: "
"Add to both sides: ")
nil 'calc-selection-history))))
(and alg
(progn
(if (and (assq func calc-tweak-eqn-table)
(= (length sel) 3))
(progn
(setq lhs (list (if subtract '- '+) (nth 1 sel) alg)
rhs (list (if subtract '- '+) (nth 2 sel) alg))
(or no-simp
(setq lhs (math-simplify lhs)
rhs (math-simplify rhs)))
(setq alg (calc-encase-atoms
(calc-normalize (list func lhs rhs)))))
(setq rhs (list (if subtract '+ '-) sel alg))
(or no-simp
(setq rhs (math-simplify rhs)))
(setq alg (calc-encase-atoms
(calc-normalize (list (if subtract '- '+) alg rhs)))))
(calc-pop-push-record-list 1 (if subtract "sub" "add")
(list (calc-replace-sub-formula
expr sel alg))
num
(list (and calc-sel-reselect alg)))))
(calc-handle-whys))))
(defun calc-sel-sub-both-sides (no-simp)
(interactive "P")
(calc-sel-add-both-sides no-simp t))
(provide 'calc-sel)
;;; calc-sel.el ends here
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