lisp/calc/calcsel2.el

   1 ;;; calcsel2.el --- selection functions for Calc
   2
   3 ;; Copyright (C) 1990, 1991, 1992, 1993, 2001 Free Software Foundation, Inc.
   4
   5 ;; Author: David Gillespie <daveg@synaptics.com>
   6 ;; Maintainer: Jay Belanger <belanger@truman.edu>
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is distributed in the hope that it will be useful,
  11 ;; but WITHOUT ANY WARRANTY.  No author or distributor
  12 ;; accepts responsibility to anyone for the consequences of using it
  13 ;; or for whether it serves any particular purpose or works at all,
  14 ;; unless he says so in writing.  Refer to the GNU Emacs General Public
  15 ;; License for full details.
  16
  17 ;; Everyone is granted permission to copy, modify and redistribute
  18 ;; GNU Emacs, but only under the conditions described in the
  19 ;; GNU Emacs General Public License.   A copy of this license is
  20 ;; supposed to have been given to you along with GNU Emacs so you
  21 ;; can know your rights and responsibilities.  It should be in a
  22 ;; file named COPYING.  Among other things, the copyright notice
  23 ;; and this notice must be preserved on all copies.
  24
  25 ;;; Commentary:
  26
  27 ;;; Code:
  28
  29 ;; This file is autoloaded from calc-ext.el.
  30
  31 (require 'calc-ext)
  32 (require 'calc-macs)
  33
  34 ;; The variable calc-keep-selection is declared and set in calc-sel.el.
  35 (defvar calc-keep-selection)
  36
  37 (defun calc-commute-left (arg)
  38   (interactive "p")
  39   (if (< arg 0)
  40       (calc-commute-right (- arg))
  41     (calc-wrapper
  42      (calc-preserve-point)
  43      (let ((num (max 1 (calc-locate-cursor-element (point))))
  44            (reselect calc-keep-selection))
  45        (if (= arg 0) (setq arg nil))
  46        (while (or (null arg) (>= (setq arg (1- arg)) 0))
  47          (let* ((entry (calc-top num 'entry))
  48                 (expr (car entry))
  49                 (sel (calc-auto-selection entry))
  50                 parent new)
  51            (or (and sel
  52                     (consp (setq parent (calc-find-assoc-parent-formula
  53                                          expr sel))))
  54                (error "No term is selected"))
  55            (if (and calc-assoc-selections
  56                     (assq (car parent) calc-assoc-ops))
  57                (let ((outer (calc-find-parent-formula parent sel)))
  58                  (if (eq sel (nth 2 outer))
  59                      (setq new (calc-replace-sub-formula
  60                                 parent outer
  61                                 (cond
  62                                  ((memq (car outer)
  63                                         (nth 1 (assq (car-safe (nth 1 outer))
  64                                                      calc-assoc-ops)))
  65                                   (let* ((other (nth 2 (nth 1 outer)))
  66                                          (new (calc-build-assoc-term
  67                                                (car (nth 1 outer))
  68                                                (calc-build-assoc-term
  69                                                 (car outer)
  70                                                 (nth 1 (nth 1 outer))
  71                                                 sel)
  72                                                other)))
  73                                     (setq sel (nth 2 (nth 1 new)))
  74                                     new))
  75                                  ((eq (car outer) '-)
  76                                   (calc-build-assoc-term
  77                                    '+
  78                                    (setq sel (math-neg sel))
  79                                    (nth 1 outer)))
  80                                  ((eq (car outer) '/)
  81                                   (calc-build-assoc-term
  82                                    '*
  83                                    (setq sel (calcFunc-div 1 sel))
  84                                    (nth 1 outer)))
  85                                  (t (calc-build-assoc-term
  86                                      (car outer) sel (nth 1 outer))))))
  87                    (let ((next (calc-find-parent-formula parent outer)))
  88                      (if (not (and (consp next)
  89                                    (eq outer (nth 2 next))
  90                                    (eq (car next) (car outer))))
  91                          (setq new nil)
  92                        (setq new (calc-build-assoc-term
  93                                   (car next)
  94                                   sel
  95                                   (calc-build-assoc-term
  96                                    (car next) (nth 1 next) (nth 2 outer)))
  97                              sel (nth 1 new)
  98                              new (calc-replace-sub-formula
  99                                   parent next new))))))
 100              (if (eq (nth 1 parent) sel)
 101                  (setq new nil)
 102                (let ((p (nthcdr (1- (calc-find-sub-formula parent sel))
 103                                 (setq new (copy-sequence parent)))))
 104                  (setcar (cdr p) (car p))
 105                  (setcar p sel))))
 106            (if (null new)
 107                (if arg
 108                    (error "Term is already leftmost")
 109                  (or reselect
 110                      (calc-pop-push-list 1 (list expr) num '(nil)))
 111                  (setq arg 0))
 112              (calc-pop-push-record-list
 113               1 "left"
 114               (list (calc-replace-sub-formula expr parent new))
 115               num
 116               (list (and (or (not (eq arg 0)) reselect)
 117                          sel))))))))))
 118
 119 (defun calc-commute-right (arg)
 120   (interactive "p")
 121   (if (< arg 0)
 122       (calc-commute-left (- arg))
 123     (calc-wrapper
 124      (calc-preserve-point)
 125      (let ((num (max 1 (calc-locate-cursor-element (point))))
 126            (reselect calc-keep-selection))
 127        (if (= arg 0) (setq arg nil))
 128        (while (or (null arg) (>= (setq arg (1- arg)) 0))
 129          (let* ((entry (calc-top num 'entry))
 130                 (expr (car entry))
 131                 (sel (calc-auto-selection entry))
 132                 parent new)
 133            (or (and sel
 134                     (consp (setq parent (calc-find-assoc-parent-formula
 135                                          expr sel))))
 136                (error "No term is selected"))
 137            (if (and calc-assoc-selections
 138                     (assq (car parent) calc-assoc-ops))
 139                (let ((outer (calc-find-parent-formula parent sel)))
 140                  (if (eq sel (nth 1 outer))
 141                      (setq new (calc-replace-sub-formula
 142                                 parent outer
 143                                 (if (memq (car outer)
 144                                           (nth 2 (assq (car-safe (nth 2 outer))
 145                                                        calc-assoc-ops)))
 146                                     (let ((other (nth 1 (nth 2 outer))))
 147                                       (calc-build-assoc-term
 148                                        (car outer)
 149                                        other
 150                                        (calc-build-assoc-term
 151                                         (car (nth 2 outer))
 152                                         sel
 153                                         (nth 2 (nth 2 outer)))))
 154                                   (let ((new (cond
 155                                               ((eq (car outer) '-)
 156                                                (calc-build-assoc-term
 157                                                 '+
 158                                                 (math-neg (nth 2 outer))
 159                                                 sel))
 160                                               ((eq (car outer) '/)
 161                                                (calc-build-assoc-term
 162                                                 '*
 163                                                 (calcFunc-div 1 (nth 2 outer))
 164                                                 sel))
 165                                               (t (calc-build-assoc-term
 166                                                   (car outer)
 167                                                   (nth 2 outer)
 168                                                   sel)))))
 169                                     (setq sel (nth 2 new))
 170                                     new))))
 171                    (let ((next (calc-find-parent-formula parent outer)))
 172                      (if (not (and (consp next)
 173                                    (eq outer (nth 1 next))))
 174                          (setq new nil)
 175                        (setq new (calc-build-assoc-term
 176                                   (car outer)
 177                                   (calc-build-assoc-term
 178                                    (car next) (nth 1 outer) (nth 2 next))
 179                                   sel)
 180                              sel (nth 2 new)
 181                              new (calc-replace-sub-formula
 182                                   parent next new))))))
 183              (if (eq (nth (1- (length parent)) parent) sel)
 184                  (setq new nil)
 185                (let ((p (nthcdr (calc-find-sub-formula parent sel)
 186                                 (setq new (copy-sequence parent)))))
 187                  (setcar p (nth 1 p))
 188                  (setcar (cdr p) sel))))
 189            (if (null new)
 190                (if arg
 191                    (error "Term is already rightmost")
 192                  (or reselect
 193                      (calc-pop-push-list 1 (list expr) num '(nil)))
 194                  (setq arg 0))
 195              (calc-pop-push-record-list
 196               1 "rght"
 197               (list (calc-replace-sub-formula expr parent new))
 198               num
 199               (list (and (or (not (eq arg 0)) reselect)
 200                          sel))))))))))
 201
 202 (defun calc-build-assoc-term (op lhs rhs)
 203   (cond ((and (eq op '+) (or (math-looks-negp rhs)
 204                              (and (eq (car-safe rhs) 'cplx)
 205                                   (math-negp (nth 1 rhs))
 206                                   (eq (nth 2 rhs) 0))))
 207          (list '- lhs (math-neg rhs)))
 208         ((and (eq op '-) (or (math-looks-negp rhs)
 209                              (and (eq (car-safe rhs) 'cplx)
 210                                   (math-negp (nth 1 rhs))
 211                                   (eq (nth 2 rhs) 0))))
 212          (list '+ lhs (math-neg rhs)))
 213         ((and (eq op '*) (and (eq (car-safe rhs) '/)
 214                               (or (math-equal-int (nth 1 rhs) 1)
 215                                   (equal (nth 1 rhs) '(cplx 1 0)))))
 216          (list '/ lhs (nth 2 rhs)))
 217         ((and (eq op '/) (and (eq (car-safe rhs) '/)
 218                               (or (math-equal-int (nth 1 rhs) 1)
 219                                   (equal (nth 1 rhs) '(cplx 1 0)))))
 220          (list '/ lhs (nth 2 rhs)))
 221         (t (list op lhs rhs))))
 222
 223 (defun calc-sel-unpack ()
 224   (interactive)
 225   (calc-wrapper
 226    (calc-preserve-point)
 227    (let* ((num (max 1 (calc-locate-cursor-element (point))))
 228           (reselect calc-keep-selection)
 229           (entry (calc-top num 'entry))
 230           (expr (car entry))
 231           (sel (or (calc-auto-selection entry) expr)))
 232      (or (and (not (math-primp sel))
 233               (= (length sel) 2))
 234          (error "Selection must be a function of one argument"))
 235      (calc-pop-push-record-list 1 "unpk"
 236                                 (list (calc-replace-sub-formula
 237                                        expr sel (nth 1 sel)))
 238                                 num
 239                                 (list (and reselect (nth 1 sel)))))))
 240
 241 (defun calc-sel-isolate ()
 242   (interactive)
 243   (calc-slow-wrapper
 244    (calc-preserve-point)
 245    (let* ((num (max 1 (calc-locate-cursor-element (point))))
 246           (reselect calc-keep-selection)
 247           (entry (calc-top num 'entry))
 248           (expr (car entry))
 249           (sel (or (calc-auto-selection entry) (error "No selection")))
 250           (eqn sel)
 251           soln)
 252      (while (and (or (consp (setq eqn (calc-find-parent-formula expr eqn)))
 253                      (error "Selection must be a member of an equation"))
 254                  (not (assq (car eqn) calc-tweak-eqn-table))))
 255      (setq soln (math-solve-eqn eqn sel calc-hyperbolic-flag))
 256      (or soln
 257          (error "No solution found"))
 258      (setq soln (calc-encase-atoms
 259                  (if (eq (not (calc-find-sub-formula (nth 2 eqn) sel))
 260                          (eq (nth 1 soln) sel))
 261                      soln
 262                    (list (nth 1 (assq (car soln) calc-tweak-eqn-table))
 263                          (nth 2 soln)
 264                          (nth 1 soln)))))
 265      (calc-pop-push-record-list 1 "isol"
 266                                 (list (calc-replace-sub-formula
 267                                        expr eqn soln))
 268                                 num
 269                                 (list (and reselect sel)))
 270      (calc-handle-whys))))
 271
 272 (defun calc-sel-commute (many)
 273   (interactive "P")
 274   (let ((calc-assoc-selections nil))
 275     (calc-rewrite-selection "CommuteRules" many "cmut"))
 276   (calc-set-mode-line))
 277
 278 (defun calc-sel-jump-equals (many)
 279   (interactive "P")
 280   (calc-rewrite-selection "JumpRules" many "jump"))
 281
 282 (defun calc-sel-distribute (many)
 283   (interactive "P")
 284   (calc-rewrite-selection "DistribRules" many "dist"))
 285
 286 (defun calc-sel-merge (many)
 287   (interactive "P")
 288   (calc-rewrite-selection "MergeRules" many "merg"))
 289
 290 (defun calc-sel-negate (many)
 291   (interactive "P")
 292   (calc-rewrite-selection "NegateRules" many "jneg"))
 293
 294 (defun calc-sel-invert (many)
 295   (interactive "P")
 296   (calc-rewrite-selection "InvertRules" many "jinv"))
 297
 298 (provide 'calcsel2)
 299
 300 ;;; arch-tag: 7c5b8d65-b8f0-45d9-820d-9930f8ee114b
 301 ;;; calcsel2.el ends here