lisp/calc/calc-aent.el

   1 ;; Calculator for GNU Emacs, part I [calc-aent.el]
   2 ;; Copyright (C) 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
   3 ;; Written by Dave Gillespie, daveg@synaptics.com.
   4
   5 ;; This file is part of GNU Emacs.
   6
   7 ;; GNU Emacs is distributed in the hope that it will be useful,
   8 ;; but WITHOUT ANY WARRANTY.  No author or distributor
   9 ;; accepts responsibility to anyone for the consequences of using it
  10 ;; or for whether it serves any particular purpose or works at all,
  11 ;; unless he says so in writing.  Refer to the GNU Emacs General Public
  12 ;; License for full details.
  13
  14 ;; Everyone is granted permission to copy, modify and redistribute
  15 ;; GNU Emacs, but only under the conditions described in the
  16 ;; GNU Emacs General Public License.   A copy of this license is
  17 ;; supposed to have been given to you along with GNU Emacs so you
  18 ;; can know your rights and responsibilities.  It should be in a
  19 ;; file named COPYING.  Among other things, the copyright notice
  20 ;; and this notice must be preserved on all copies.
  21
  22
  23
  24 ;; This file is autoloaded from calc.el.
  25 (require 'calc)
  26
  27 (require 'calc-macs)
  28
  29 (defun calc-Need-calc-aent () nil)
  30
  31
  32 (defun calc-do-quick-calc ()
  33   (calc-check-defines)
  34   (if (eq major-mode 'calc-mode)
  35       (calc-algebraic-entry t)
  36     (let (buf shortbuf)
  37       (save-excursion
  38         (calc-create-buffer)
  39         (let* ((calc-command-flags nil)
  40                (calc-dollar-values calc-quick-prev-results)
  41                (calc-dollar-used 0)
  42                (enable-recursive-minibuffers t)
  43                (calc-language (if (memq calc-language '(nil big))
  44                                   'flat calc-language))
  45                (entry (calc-do-alg-entry "" "Quick calc: " t))
  46                (alg-exp (mapcar (function
  47                                  (lambda (x)
  48                                    (if (and (not calc-extensions-loaded)
  49                                             calc-previous-alg-entry
  50                                             (string-match
  51                                              "\\`[-0-9._+*/^() ]+\\'"
  52                                              calc-previous-alg-entry))
  53                                        (calc-normalize x)
  54                                      (calc-extensions)
  55                                      (math-evaluate-expr x))))
  56                                 entry)))
  57           (if (and (= (length alg-exp) 1)
  58                    (eq (car-safe (car alg-exp)) 'calcFunc-assign)
  59                    (= (length (car alg-exp)) 3)
  60                    (eq (car-safe (nth 1 (car alg-exp))) 'var))
  61               (progn
  62                 (calc-extensions)
  63                 (set (nth 2 (nth 1 (car alg-exp))) (nth 2 (car alg-exp)))
  64                 (calc-refresh-evaltos (nth 2 (nth 1 (car alg-exp))))
  65                 (setq alg-exp (list (nth 2 (car alg-exp))))))
  66           (setq calc-quick-prev-results alg-exp
  67                 buf (mapconcat (function (lambda (x)
  68                                            (math-format-value x 1000)))
  69                                alg-exp
  70                                " ")
  71                 shortbuf buf)
  72           (if (and (= (length alg-exp) 1)
  73                    (memq (car-safe (car alg-exp)) '(nil bigpos bigneg))
  74                    (< (length buf) 20)
  75                    (= calc-number-radix 10))
  76               (setq buf (concat buf "  ("
  77                                 (let ((calc-number-radix 16))
  78                                   (math-format-value (car alg-exp) 1000))
  79                                 ", "
  80                                 (let ((calc-number-radix 8))
  81                                   (math-format-value (car alg-exp) 1000))
  82                                 (if (and (integerp (car alg-exp))
  83                                          (> (car alg-exp) 0)
  84                                          (< (car alg-exp) 127))
  85                                     (format ", \"%c\"" (car alg-exp))
  86                                   "")
  87                                 ")")))
  88           (if (and (< (length buf) (screen-width)) (= (length entry) 1)
  89                    calc-extensions-loaded)
  90               (let ((long (concat (math-format-value (car entry) 1000)
  91                                   " =>  " buf)))
  92                 (if (<= (length long) (- (screen-width) 8))
  93                     (setq buf long))))
  94           (calc-handle-whys)
  95           (message "Result: %s" buf)))
  96       (if (eq last-command-char 10)
  97           (insert shortbuf)
  98         (setq kill-ring (cons shortbuf kill-ring))
  99         (if (> (length kill-ring) kill-ring-max)
 100             (setcdr (nthcdr (1- kill-ring-max) kill-ring) nil))
 101         (setq kill-ring-yank-pointer kill-ring))))
 102 )
 103
 104 (defun calc-do-calc-eval (str separator args)
 105   (calc-check-defines)
 106   (catch 'calc-error
 107     (save-excursion
 108       (calc-create-buffer)
 109       (cond
 110        ((and (consp str) (not (symbolp (car str))))
 111         (let ((calc-language nil)
 112               (math-expr-opers math-standard-opers)
 113               (calc-internal-prec 12)
 114               (calc-word-size 32)
 115               (calc-symbolic-mode nil)
 116               (calc-matrix-mode nil)
 117               (calc-angle-mode 'deg)
 118               (calc-number-radix 10)
 119               (calc-leading-zeros nil)
 120               (calc-group-digits nil)
 121               (calc-point-char ".")
 122               (calc-frac-format '(":" nil))
 123               (calc-prefer-frac nil)
 124               (calc-hms-format "%s@ %s' %s\"")
 125               (calc-date-format '((H ":" mm C SS pp " ")
 126                                   Www " " Mmm " " D ", " YYYY))
 127               (calc-float-format '(float 0))
 128               (calc-full-float-format '(float 0))
 129               (calc-complex-format nil)
 130               (calc-matrix-just nil)
 131               (calc-full-vectors t)
 132               (calc-break-vectors nil)
 133               (calc-vector-commas ",")
 134               (calc-vector-brackets "[]")
 135               (calc-matrix-brackets '(R O))
 136               (calc-complex-mode 'cplx)
 137               (calc-infinite-mode nil)
 138               (calc-display-strings nil)
 139               (calc-simplify-mode nil)
 140               (calc-display-working-message 'lots)
 141               (strp (cdr str)))
 142           (while strp
 143             (set (car strp) (nth 1 strp))
 144             (setq strp (cdr (cdr strp))))
 145           (calc-do-calc-eval (car str) separator args)))
 146        ((eq separator 'eval)
 147         (eval str))
 148        ((eq separator 'macro)
 149         (calc-extensions)
 150         (let* ((calc-buffer (current-buffer))
 151                (calc-window (get-buffer-window calc-buffer))
 152                (save-window (selected-window)))
 153           (if calc-window
 154               (unwind-protect
 155                   (progn
 156                     (select-window calc-window)
 157                     (calc-execute-kbd-macro str nil (car args)))
 158                 (and (window-point save-window)
 159                      (select-window save-window)))
 160             (save-window-excursion
 161               (select-window (get-largest-window))
 162               (switch-to-buffer calc-buffer)
 163               (calc-execute-kbd-macro str nil (car args)))))
 164         nil)
 165        ((eq separator 'pop)
 166         (or (not (integerp str))
 167             (= str 0)
 168             (calc-pop (min str (calc-stack-size))))
 169         (calc-stack-size))
 170        ((eq separator 'top)
 171         (and (integerp str)
 172              (> str 0)
 173              (<= str (calc-stack-size))
 174              (math-format-value (calc-top-n str (car args)) 1000)))
 175        ((eq separator 'rawtop)
 176         (and (integerp str)
 177              (> str 0)
 178              (<= str (calc-stack-size))
 179              (calc-top-n str (car args))))
 180        (t
 181         (let* ((calc-command-flags nil)
 182                (calc-next-why nil)
 183                (calc-language (if (memq calc-language '(nil big))
 184                                   'flat calc-language))
 185                (calc-dollar-values (mapcar
 186                                     (function
 187                                      (lambda (x)
 188                                        (if (stringp x)
 189                                            (progn
 190                                              (setq x (math-read-exprs x))
 191                                              (if (eq (car-safe x)
 192                                                      'error)
 193                                                  (throw 'calc-error
 194                                                         (calc-eval-error
 195                                                          (cdr x)))
 196                                                (car x)))
 197                                          x)))
 198                                     args))
 199                (calc-dollar-used 0)
 200                (res (if (stringp str)
 201                         (math-read-exprs str)
 202                       (list str)))
 203                buf)
 204           (if (eq (car res) 'error)
 205               (calc-eval-error (cdr res))
 206             (setq res (mapcar 'calc-normalize res))
 207             (and (memq 'clear-message calc-command-flags)
 208                  (message ""))
 209             (cond ((eq separator 'pred)
 210                    (calc-extensions)
 211                    (if (= (length res) 1)
 212                        (math-is-true (car res))
 213                      (calc-eval-error '(0 "Single value expected"))))
 214                   ((eq separator 'raw)
 215                    (if (= (length res) 1)
 216                        (car res)
 217                      (calc-eval-error '(0 "Single value expected"))))
 218                   ((eq separator 'list)
 219                    res)
 220                   ((memq separator '(num rawnum))
 221                    (if (= (length res) 1)
 222                        (if (math-constp (car res))
 223                            (if (eq separator 'num)
 224                                (math-format-value (car res) 1000)
 225                              (car res))
 226                          (calc-eval-error
 227                           (list 0
 228                                 (if calc-next-why
 229                                     (calc-explain-why (car calc-next-why))
 230                                   "Number expected"))))
 231                      (calc-eval-error '(0 "Single value expected"))))
 232                   ((eq separator 'push)
 233                    (calc-push-list res)
 234                    nil)
 235                   (t (while res
 236                        (setq buf (concat buf
 237                                          (and buf (or separator ", "))
 238                                          (math-format-value (car res) 1000))
 239                              res (cdr res)))
 240                      buf))))))))
 241 )
 242
 243 (defun calc-eval-error (msg)
 244   (if (and (boundp 'calc-eval-error)
 245            calc-eval-error)
 246       (if (eq calc-eval-error 'string)
 247           (nth 1 msg)
 248         (error "%s" (nth 1 msg)))
 249     msg)
 250 )
 251
 252
 253 ;;;; Reading an expression in algebraic form.
 254
 255 (defun calc-auto-algebraic-entry (&optional prefix)
 256   (interactive "P")
 257   (calc-algebraic-entry prefix t)
 258 )
 259
 260 (defun calc-algebraic-entry (&optional prefix auto)
 261   (interactive "P")
 262   (calc-wrapper
 263    (let ((calc-language (if prefix nil calc-language))
 264          (math-expr-opers (if prefix math-standard-opers math-expr-opers)))
 265      (calc-alg-entry (and auto (char-to-string last-command-char)))))
 266 )
 267
 268 (defun calc-alg-entry (&optional initial prompt)
 269   (let* ((sel-mode nil)
 270          (calc-dollar-values (mapcar 'calc-get-stack-element
 271                                      (nthcdr calc-stack-top calc-stack)))
 272          (calc-dollar-used 0)
 273          (calc-plain-entry t)
 274          (alg-exp (calc-do-alg-entry initial prompt t)))
 275     (if (stringp alg-exp)
 276         (progn
 277           (calc-extensions)
 278           (calc-alg-edit alg-exp))
 279       (let* ((calc-simplify-mode (if (eq last-command-char ?\C-j)
 280                                      'none
 281                                    calc-simplify-mode))
 282              (nvals (mapcar 'calc-normalize alg-exp)))
 283         (while alg-exp
 284           (calc-record (if calc-extensions-loaded (car alg-exp) (car nvals))
 285                        "alg'")
 286           (calc-pop-push-record-list calc-dollar-used
 287                                      (and (not (equal (car alg-exp)
 288                                                       (car nvals)))
 289                                           calc-extensions-loaded
 290                                           "")
 291                                      (list (car nvals)))
 292           (setq alg-exp (cdr alg-exp)
 293                 nvals (cdr nvals)
 294                 calc-dollar-used 0)))
 295       (calc-handle-whys)))
 296 )
 297
 298 (defun calc-do-alg-entry (&optional initial prompt no-normalize)
 299   (let* ((calc-buffer (current-buffer))
 300          (blink-paren-hook 'calcAlg-blink-matching-open)
 301          (alg-exp 'error))
 302     (if (boundp 'calc-alg-ent-map)
 303         ()
 304       (setq calc-alg-ent-map (copy-keymap minibuffer-local-map))
 305       (define-key calc-alg-ent-map "'" 'calcAlg-previous)
 306       (define-key calc-alg-ent-map "`" 'calcAlg-edit)
 307       (define-key calc-alg-ent-map "\C-m" 'calcAlg-enter)
 308       (define-key calc-alg-ent-map "\C-j" 'calcAlg-enter)
 309       (or calc-emacs-type-19
 310           (let ((i 33))
 311             (setq calc-alg-ent-esc-map (copy-sequence esc-map))
 312             (while (< i 127)
 313               (aset calc-alg-ent-esc-map i 'calcAlg-escape)
 314               (setq i (1+ i))))))
 315     (or calc-emacs-type-19
 316         (define-key calc-alg-ent-map "\e" nil))
 317     (if (eq calc-algebraic-mode 'total)
 318         (define-key calc-alg-ent-map "\e" calc-alg-ent-esc-map)
 319       (define-key calc-alg-ent-map "\ep" 'calcAlg-plus-minus)
 320       (define-key calc-alg-ent-map "\em" 'calcAlg-mod)
 321       (define-key calc-alg-ent-map "\e=" 'calcAlg-equals)
 322       (define-key calc-alg-ent-map "\e\r" 'calcAlg-equals)
 323       (define-key calc-alg-ent-map "\e%" 'self-insert-command))
 324     (setq calc-aborted-prefix nil)
 325     (let ((buf (read-from-minibuffer (or prompt "Algebraic: ")
 326                                      (or initial "")
 327                                      calc-alg-ent-map nil)))
 328       (if (eq alg-exp 'error)
 329           (if (eq (car-safe (setq alg-exp (math-read-exprs buf))) 'error)
 330               (setq alg-exp nil)))
 331       (setq calc-aborted-prefix "alg'")
 332       (or no-normalize
 333           (and alg-exp (setq alg-exp (mapcar 'calc-normalize alg-exp))))
 334       alg-exp))
 335 )
 336
 337 (defun calcAlg-plus-minus ()
 338   (interactive)
 339   (if (calc-minibuffer-contains ".* \\'")
 340       (insert "+/- ")
 341     (insert " +/- "))
 342 )
 343
 344 (defun calcAlg-mod ()
 345   (interactive)
 346   (if (not (calc-minibuffer-contains ".* \\'"))
 347       (insert " "))
 348   (if (calc-minibuffer-contains ".* mod +\\'")
 349       (if calc-previous-modulo
 350           (insert (math-format-flat-expr calc-previous-modulo 0))
 351         (beep))
 352     (insert "mod "))
 353 )
 354
 355 (defun calcAlg-previous ()
 356   (interactive)
 357   (if (calc-minibuffer-contains "\\`\\'")
 358       (if calc-previous-alg-entry
 359           (insert calc-previous-alg-entry)
 360         (beep))
 361     (insert "'"))
 362 )
 363
 364 (defun calcAlg-equals ()
 365   (interactive)
 366   (unwind-protect
 367       (calcAlg-enter)
 368     (if (consp alg-exp)
 369         (progn (setq prefix-arg (length alg-exp))
 370                (calc-unread-command ?=))))
 371 )
 372
 373 (defun calcAlg-escape ()
 374   (interactive)
 375   (calc-unread-command)
 376   (save-excursion
 377     (calc-select-buffer)
 378     (use-local-map calc-mode-map))
 379   (calcAlg-enter)
 380 )
 381
 382 (defun calcAlg-edit ()
 383   (interactive)
 384   (if (or (not calc-plain-entry)
 385           (calc-minibuffer-contains
 386            "\\`\\([^\"]*\"[^\"]*\"\\)*[^\"]*\"[^\"]*\\'"))
 387       (insert "`")
 388     (setq alg-exp (buffer-string))
 389     (and (> (length alg-exp) 0) (setq calc-previous-alg-entry alg-exp))
 390     (exit-minibuffer))
 391 )
 392 (setq calc-plain-entry nil)
 393
 394 (defun calcAlg-enter ()
 395   (interactive)
 396   (let* ((str (buffer-string))
 397          (exp (and (> (length str) 0)
 398                    (save-excursion
 399                      (set-buffer calc-buffer)
 400                      (math-read-exprs str)))))
 401     (if (eq (car-safe exp) 'error)
 402         (progn
 403           (goto-char (point-min))
 404           (forward-char (nth 1 exp))
 405           (beep)
 406           (calc-temp-minibuffer-message
 407            (concat " [" (or (nth 2 exp) "Error") "]"))
 408           (calc-clear-unread-commands))
 409       (setq alg-exp (if (calc-minibuffer-contains "\\` *\\[ *\\'")
 410                         '((incomplete vec))
 411                       exp))
 412       (and (> (length str) 0) (setq calc-previous-alg-entry str))
 413       (exit-minibuffer)))
 414 )
 415
 416 (defun calcAlg-blink-matching-open ()
 417   (let ((oldpos (point))
 418         (blinkpos nil))
 419     (save-excursion
 420       (condition-case ()
 421           (setq blinkpos (scan-sexps oldpos -1))
 422         (error nil)))
 423     (if (and blinkpos
 424              (> oldpos (1+ (point-min)))
 425              (or (and (= (char-after (1- oldpos)) ?\))
 426                       (= (char-after blinkpos) ?\[))
 427                  (and (= (char-after (1- oldpos)) ?\])
 428                       (= (char-after blinkpos) ?\()))
 429              (save-excursion
 430                (goto-char blinkpos)
 431                (looking-at ".+\\(\\.\\.\\|\\\\dots\\|\\\\ldots\\)")))
 432         (let ((saved (aref (syntax-table) (char-after blinkpos))))
 433           (unwind-protect
 434               (progn
 435                 (aset (syntax-table) (char-after blinkpos)
 436                       (+ (logand saved 255)
 437                          (lsh (char-after (1- oldpos)) 8)))
 438                 (blink-matching-open))
 439             (aset (syntax-table) (char-after blinkpos) saved)))
 440       (blink-matching-open)))
 441 )
 442
 443
 444 (defun calc-alg-digit-entry ()
 445   (calc-alg-entry
 446    (cond ((eq last-command-char ?e)
 447           (if (> calc-number-radix 14) (format "%d.^" calc-number-radix) "1e"))
 448          ((eq last-command-char ?#) (format "%d#" calc-number-radix))
 449          ((eq last-command-char ?_) "-")
 450          ((eq last-command-char ?@) "0@ ")
 451          (t (char-to-string last-command-char))))
 452 )
 453
 454 (defun calcDigit-algebraic ()
 455   (interactive)
 456   (if (calc-minibuffer-contains ".*[@oh] *[^'m ]+[^'m]*\\'")
 457       (calcDigit-key)
 458     (setq calc-digit-value (buffer-string))
 459     (exit-minibuffer))
 460 )
 461
 462 (defun calcDigit-edit ()
 463   (interactive)
 464   (calc-unread-command)
 465   (setq calc-digit-value (buffer-string))
 466   (exit-minibuffer)
 467 )
 468
 469
 470 ;;; Algebraic expression parsing.   [Public]
 471
 472 (defun math-read-exprs (exp-str)
 473   (let ((exp-pos 0)
 474         (exp-old-pos 0)
 475         (exp-keep-spaces nil)
 476         exp-token exp-data)
 477     (if calc-language-input-filter
 478         (setq exp-str (funcall calc-language-input-filter exp-str)))
 479     (while (setq exp-token (string-match "\\.\\.\\([^.]\\|.[^.]\\)" exp-str))
 480       (setq exp-str (concat (substring exp-str 0 exp-token) "\\dots"
 481                             (substring exp-str (+ exp-token 2)))))
 482     (math-build-parse-table)
 483     (math-read-token)
 484     (let ((val (catch 'syntax (math-read-expr-list))))
 485       (if (stringp val)
 486           (list 'error exp-old-pos val)
 487         (if (equal exp-token 'end)
 488             val
 489           (list 'error exp-old-pos "Syntax error")))))
 490 )
 491
 492 (defun math-read-expr-list ()
 493   (let* ((exp-keep-spaces nil)
 494          (val (list (math-read-expr-level 0)))
 495          (last val))
 496     (while (equal exp-data ",")
 497       (math-read-token)
 498       (let ((rest (list (math-read-expr-level 0))))
 499         (setcdr last rest)
 500         (setq last rest)))
 501     val)
 502 )
 503
 504 (setq calc-user-parse-table nil)
 505 (setq calc-last-main-parse-table nil)
 506 (setq calc-last-lang-parse-table nil)
 507 (setq calc-user-tokens nil)
 508 (setq calc-user-token-chars nil)
 509
 510 (defun math-build-parse-table ()
 511   (let ((mtab (cdr (assq nil calc-user-parse-tables)))
 512         (ltab (cdr (assq calc-language calc-user-parse-tables))))
 513     (or (and (eq mtab calc-last-main-parse-table)
 514              (eq ltab calc-last-lang-parse-table))
 515         (let ((p (append mtab ltab))
 516               (toks nil))
 517           (setq calc-user-parse-table p)
 518           (setq calc-user-token-chars nil)
 519           (while p
 520             (math-find-user-tokens (car (car p)))
 521             (setq p (cdr p)))
 522           (setq calc-user-tokens (mapconcat 'identity
 523                                             (sort (mapcar 'car toks)
 524                                                   (function (lambda (x y)
 525                                                               (> (length x)
 526                                                                  (length y)))))
 527                                             "\\|")
 528                 calc-last-main-parse-table mtab
 529                 calc-last-lang-parse-table ltab))))
 530 )
 531
 532 (defun math-find-user-tokens (p)   ; uses "toks"
 533   (while p
 534     (cond ((and (stringp (car p))
 535                 (or (> (length (car p)) 1) (equal (car p) "$")
 536                     (equal (car p) "\""))
 537                 (string-match "[^a-zA-Z0-9]" (car p)))
 538            (let ((s (regexp-quote (car p))))
 539              (if (string-match "\\`[a-zA-Z0-9]" s)
 540                  (setq s (concat "\\<" s)))
 541              (if (string-match "[a-zA-Z0-9]\\'" s)
 542                  (setq s (concat s "\\>")))
 543              (or (assoc s toks)
 544                  (progn
 545                    (setq toks (cons (list s) toks))
 546                    (or (memq (aref (car p) 0) calc-user-token-chars)
 547                        (setq calc-user-token-chars
 548                              (cons (aref (car p) 0)
 549                                    calc-user-token-chars)))))))
 550           ((consp (car p))
 551            (math-find-user-tokens (nth 1 (car p)))
 552            (or (eq (car (car p)) '\?)
 553                (math-find-user-tokens (nth 2 (car p))))))
 554     (setq p (cdr p)))
 555 )
 556
 557 (defun math-read-token ()
 558   (if (>= exp-pos (length exp-str))
 559       (setq exp-old-pos exp-pos
 560             exp-token 'end
 561             exp-data "\000")
 562     (let ((ch (aref exp-str exp-pos)))
 563       (setq exp-old-pos exp-pos)
 564       (cond ((memq ch '(32 10 9))
 565              (setq exp-pos (1+ exp-pos))
 566              (if exp-keep-spaces
 567                  (setq exp-token 'space
 568                        exp-data " ")
 569                (math-read-token)))
 570             ((and (memq ch calc-user-token-chars)
 571                   (let ((case-fold-search nil))
 572                     (eq (string-match calc-user-tokens exp-str exp-pos)
 573                         exp-pos)))
 574              (setq exp-token 'punc
 575                    exp-data (math-match-substring exp-str 0)
 576                    exp-pos (match-end 0)))
 577             ((or (and (>= ch ?a) (<= ch ?z))
 578                  (and (>= ch ?A) (<= ch ?Z)))
 579              (string-match (if (memq calc-language '(c fortran pascal maple))
 580                                "[a-zA-Z0-9_#]*"
 581                              "[a-zA-Z0-9'#]*")
 582                            exp-str exp-pos)
 583              (setq exp-token 'symbol
 584                    exp-pos (match-end 0)
 585                    exp-data (math-restore-dashes
 586                              (math-match-substring exp-str 0)))
 587              (if (eq calc-language 'eqn)
 588                  (let ((code (assoc exp-data math-eqn-ignore-words)))
 589                    (cond ((null code))
 590                          ((null (cdr code))
 591                           (math-read-token))
 592                          ((consp (nth 1 code))
 593                           (math-read-token)
 594                           (if (assoc exp-data (cdr code))
 595                               (setq exp-data (format "%s %s"
 596                                                      (car code) exp-data))))
 597                          ((eq (nth 1 code) 'punc)
 598                           (setq exp-token 'punc
 599                                 exp-data (nth 2 code)))
 600                          (t
 601                           (math-read-token)
 602                           (math-read-token))))))
 603             ((or (and (>= ch ?0) (<= ch ?9))
 604                  (and (eq ch '?\.)
 605                       (eq (string-match "\\.[0-9]" exp-str exp-pos) exp-pos))
 606                  (and (eq ch '?_)
 607                       (eq (string-match "_\\.?[0-9]" exp-str exp-pos) exp-pos)
 608                       (or (eq exp-pos 0)
 609                           (and (memq calc-language '(nil flat big unform
 610                                                          tex eqn))
 611                                (eq (string-match "[^])}\"a-zA-Z0-9'$]_"
 612                                                  exp-str (1- exp-pos))
 613                                    (1- exp-pos))))))
 614              (or (and (eq calc-language 'c)
 615                       (string-match "0[xX][0-9a-fA-F]+" exp-str exp-pos))
 616                  (string-match "_?\\([0-9]+.?0*@ *\\)?\\([0-9]+.?0*' *\\)?\\(0*\\([2-9]\\|1[0-4]\\)\\(#\\|\\^\\^\\)[0-9a-dA-D.]+[eE][-+_]?[0-9]+\\|0*\\([2-9]\\|[0-2][0-9]\\|3[0-6]\\)\\(#\\|\\^\\^\\)[0-9a-zA-Z:.]+\\|[0-9]+:[0-9:]+\\|[0-9.]+\\([eE][-+_]?[0-9]+\\)?\"?\\)?" exp-str exp-pos))
 617              (setq exp-token 'number
 618                    exp-data (math-match-substring exp-str 0)
 619                    exp-pos (match-end 0)))
 620             ((eq ch ?\$)
 621              (if (and (eq calc-language 'pascal)
 622                       (eq (string-match
 623                            "\\(\\$[0-9a-fA-F]+\\)\\($\\|[^0-9a-zA-Z]\\)"
 624                            exp-str exp-pos)
 625                           exp-pos))
 626                  (setq exp-token 'number
 627                        exp-data (math-match-substring exp-str 1)
 628                        exp-pos (match-end 1))
 629                (if (eq (string-match "\\$\\([1-9][0-9]*\\)" exp-str exp-pos)
 630                        exp-pos)
 631                    (setq exp-data (- (string-to-int (math-match-substring
 632                                                      exp-str 1))))
 633                  (string-match "\\$+" exp-str exp-pos)
 634                  (setq exp-data (- (match-end 0) (match-beginning 0))))
 635                (setq exp-token 'dollar
 636                      exp-pos (match-end 0))))
 637             ((eq ch ?\#)
 638              (if (eq (string-match "#\\([1-9][0-9]*\\)" exp-str exp-pos)
 639                      exp-pos)
 640                  (setq exp-data (string-to-int
 641                                  (math-match-substring exp-str 1))
 642                        exp-pos (match-end 0))
 643                (setq exp-data 1
 644                      exp-pos (1+ exp-pos)))
 645              (setq exp-token 'hash))
 646             ((eq (string-match "~=\\|<=\\|>=\\|<>\\|/=\\|\\+/-\\|\\\\dots\\|\\\\ldots\\|\\*\\*\\|<<\\|>>\\|==\\|!=\\|&&&\\||||\\|!!!\\|&&\\|||\\|!!\\|:=\\|::\\|=>"
 647                                exp-str exp-pos)
 648                  exp-pos)
 649              (setq exp-token 'punc
 650                    exp-data (math-match-substring exp-str 0)
 651                    exp-pos (match-end 0)))
 652             ((and (eq ch ?\")
 653                   (string-match "\\(\"\\([^\"\\]\\|\\\\.\\)*\\)\\(\"\\|\\'\\)" exp-str exp-pos))
 654              (if (eq calc-language 'eqn)
 655                  (progn
 656                    (setq exp-str (copy-sequence exp-str))
 657                    (aset exp-str (match-beginning 1) ?\{)
 658                    (if (< (match-end 1) (length exp-str))
 659                        (aset exp-str (match-end 1) ?\}))
 660                    (math-read-token))
 661                (setq exp-token 'string
 662                      exp-data (math-match-substring exp-str 1)
 663                      exp-pos (match-end 0))))
 664             ((and (= ch ?\\) (eq calc-language 'tex)
 665                   (< exp-pos (1- (length exp-str))))
 666              (or (string-match "\\\\hbox *{\\([a-zA-Z0-9]+\\)}" exp-str exp-pos)
 667                  (string-match "\\(\\\\\\([a-zA-Z]+\\|[^a-zA-Z]\\)\\)" exp-str exp-pos))
 668              (setq exp-token 'symbol
 669                    exp-pos (match-end 0)
 670                    exp-data (math-restore-dashes
 671                              (math-match-substring exp-str 1)))
 672              (let ((code (assoc exp-data math-tex-ignore-words)))
 673                (cond ((null code))
 674                      ((null (cdr code))
 675                       (math-read-token))
 676                      ((eq (nth 1 code) 'punc)
 677                       (setq exp-token 'punc
 678                             exp-data (nth 2 code)))
 679                      ((and (eq (nth 1 code) 'mat)
 680                            (string-match " *{" exp-str exp-pos))
 681                       (setq exp-pos (match-end 0)
 682                             exp-token 'punc
 683                             exp-data "[")
 684                       (let ((right (string-match "}" exp-str exp-pos)))
 685                         (and right
 686                              (setq exp-str (copy-sequence exp-str))
 687                              (aset exp-str right ?\])))))))
 688             ((and (= ch ?\.) (eq calc-language 'fortran)
 689                   (eq (string-match "\\.[a-zA-Z][a-zA-Z][a-zA-Z]?\\."
 690                                     exp-str exp-pos) exp-pos))
 691              (setq exp-token 'punc
 692                    exp-data (upcase (math-match-substring exp-str 0))
 693                    exp-pos (match-end 0)))
 694             ((and (eq calc-language 'math)
 695                   (eq (string-match "\\[\\[\\|->\\|:>" exp-str exp-pos)
 696                       exp-pos))
 697              (setq exp-token 'punc
 698                    exp-data (math-match-substring exp-str 0)
 699                    exp-pos (match-end 0)))
 700             ((and (eq calc-language 'eqn)
 701                   (eq (string-match "->\\|<-\\|+-\\|\\\\dots\\|~\\|\\^"
 702                                     exp-str exp-pos)
 703                       exp-pos))
 704              (setq exp-token 'punc
 705                    exp-data (math-match-substring exp-str 0)
 706                    exp-pos (match-end 0))
 707              (and (eq (string-match "\\\\dots\\." exp-str exp-pos) exp-pos)
 708                   (setq exp-pos (match-end 0)))
 709              (if (memq (aref exp-data 0) '(?~ ?^))
 710                  (math-read-token)))
 711             ((eq (string-match "%%.*$" exp-str exp-pos) exp-pos)
 712              (setq exp-pos (match-end 0))
 713              (math-read-token))
 714             (t
 715              (if (and (eq ch ?\{) (memq calc-language '(tex eqn)))
 716                  (setq ch ?\())
 717              (if (and (eq ch ?\}) (memq calc-language '(tex eqn)))
 718                  (setq ch ?\)))
 719              (if (and (eq ch ?\&) (eq calc-language 'tex))
 720                  (setq ch ?\,))
 721              (setq exp-token 'punc
 722                    exp-data (char-to-string ch)
 723                    exp-pos (1+ exp-pos))))))
 724 )
 725
 726
 727 (defun math-read-expr-level (exp-prec &optional exp-term)
 728   (let* ((x (math-read-factor)) (first t) op op2)
 729     (while (and (or (and calc-user-parse-table
 730                          (setq op (calc-check-user-syntax x exp-prec))
 731                          (setq x op
 732                                op '("2x" ident 999999 -1)))
 733                     (and (setq op (assoc exp-data math-expr-opers))
 734                          (/= (nth 2 op) -1)
 735                          (or (and (setq op2 (assoc
 736                                              exp-data
 737                                              (cdr (memq op math-expr-opers))))
 738                                   (eq (= (nth 3 op) -1)
 739                                       (/= (nth 3 op2) -1))
 740                                   (eq (= (nth 3 op2) -1)
 741                                       (not (math-factor-after)))
 742                                   (setq op op2))
 743                              t))
 744                     (and (or (eq (nth 2 op) -1)
 745                              (memq exp-token '(symbol number dollar hash))
 746                              (equal exp-data "(")
 747                              (and (equal exp-data "[")
 748                                   (not (eq calc-language 'math))
 749                                   (not (and exp-keep-spaces
 750                                             (eq (car-safe x) 'vec)))))
 751                          (or (not (setq op (assoc exp-data math-expr-opers)))
 752                              (/= (nth 2 op) -1))
 753                          (or (not calc-user-parse-table)
 754                              (not (eq exp-token 'symbol))
 755                              (let ((p calc-user-parse-table))
 756                                (while (and p
 757                                            (or (not (integerp
 758                                                      (car (car (car p)))))
 759                                                (not (equal
 760                                                      (nth 1 (car (car p)))
 761                                                      exp-data))))
 762                                  (setq p (cdr p)))
 763                                (not p)))
 764                          (setq op (assoc "2x" math-expr-opers))))
 765                 (not (and exp-term (equal exp-data exp-term)))
 766                 (>= (nth 2 op) exp-prec))
 767       (if (not (equal (car op) "2x"))
 768           (math-read-token))
 769       (and (memq (nth 1 op) '(sdev mod))
 770            (calc-extensions))
 771       (setq x (cond ((consp (nth 1 op))
 772                      (funcall (car (nth 1 op)) x op))
 773                     ((eq (nth 3 op) -1)
 774                      (if (eq (nth 1 op) 'ident)
 775                          x
 776                        (if (eq (nth 1 op) 'closing)
 777                            (if (eq (nth 2 op) exp-prec)
 778                                (progn
 779                                  (setq exp-prec 1000)
 780                                  x)
 781                              (throw 'syntax "Mismatched delimiters"))
 782                          (list (nth 1 op) x))))
 783                     ((and (not first)
 784                           (memq (nth 1 op) math-alg-inequalities)
 785                           (memq (car-safe x) math-alg-inequalities))
 786                      (calc-extensions)
 787                      (math-composite-inequalities x op))
 788                     (t (list (nth 1 op)
 789                              x
 790                              (math-read-expr-level (nth 3 op) exp-term))))
 791             first nil))
 792     x)
 793 )
 794
 795 (defun calc-check-user-syntax (&optional x prec)
 796   (let ((p calc-user-parse-table)
 797         (matches nil)
 798         match rule)
 799     (while (and p
 800                 (or (not (progn
 801                            (setq rule (car (car p)))
 802                            (if x
 803                                (and (integerp (car rule))
 804                                     (>= (car rule) prec)
 805                                     (equal exp-data
 806                                            (car (setq rule (cdr rule)))))
 807                              (equal exp-data (car rule)))))
 808                     (let ((save-exp-pos exp-pos)
 809                           (save-exp-old-pos exp-old-pos)
 810                           (save-exp-token exp-token)
 811                           (save-exp-data exp-data))
 812                       (or (not (listp
 813                                 (setq matches (calc-match-user-syntax rule))))
 814                           (let ((args (progn
 815                                         (calc-extensions)
 816                                         calc-arg-values))
 817                                 (conds nil)
 818                                 temp)
 819                             (if x
 820                                 (setq matches (cons x matches)))
 821                             (setq match (cdr (car p)))
 822                             (while (and (eq (car-safe match)
 823                                             'calcFunc-condition)
 824                                         (= (length match) 3))
 825                               (setq conds (append (math-flatten-lands
 826                                                    (nth 2 match))
 827                                                   conds)
 828                                     match (nth 1 match)))
 829                             (while (and conds match)
 830                               (calc-extensions)
 831                               (cond ((eq (car-safe (car conds))
 832                                          'calcFunc-let)
 833                                      (setq temp (car conds))
 834                                      (or (= (length temp) 3)
 835                                          (and (= (length temp) 2)
 836                                               (eq (car-safe (nth 1 temp))
 837                                                   'calcFunc-assign)
 838                                               (= (length (nth 1 temp)) 3)
 839                                               (setq temp (nth 1 temp)))
 840                                          (setq match nil))
 841                                      (setq matches (cons
 842                                                     (math-normalize
 843                                                      (math-multi-subst
 844                                                       (nth 2 temp)
 845                                                       args matches))
 846                                                     matches)
 847                                            args (cons (nth 1 temp)
 848                                                       args)))
 849                                     ((and (eq (car-safe (car conds))
 850                                               'calcFunc-matches)
 851                                           (= (length (car conds)) 3))
 852                                      (setq temp (calcFunc-vmatches
 853                                                  (math-multi-subst
 854                                                   (nth 1 (car conds))
 855                                                   args matches)
 856                                                  (nth 2 (car conds))))
 857                                      (if (eq temp 0)
 858                                          (setq match nil)
 859                                        (while (setq temp (cdr temp))
 860                                          (setq matches (cons (nth 2 (car temp))
 861                                                              matches)
 862                                                args (cons (nth 1 (car temp))
 863                                                           args)))))
 864                                     (t
 865                                      (or (math-is-true (math-simplify
 866                                                         (math-multi-subst
 867                                                          (car conds)
 868                                                          args matches)))
 869                                          (setq match nil))))
 870                               (setq conds (cdr conds)))
 871                             (if match
 872                                 (not (setq match (math-multi-subst
 873                                                   match args matches)))
 874                               (setq exp-old-pos save-exp-old-pos
 875                                     exp-token save-exp-token
 876                                     exp-data save-exp-data
 877                                     exp-pos save-exp-pos)))))))
 878       (setq p (cdr p)))
 879     (and p match))
 880 )
 881
 882 (defun calc-match-user-syntax (p &optional term)
 883   (let ((matches nil)
 884         (save-exp-pos exp-pos)
 885         (save-exp-old-pos exp-old-pos)
 886         (save-exp-token exp-token)
 887         (save-exp-data exp-data))
 888     (while (and p
 889                 (cond ((stringp (car p))
 890                        (and (equal exp-data (car p))
 891                             (progn
 892                               (math-read-token)
 893                               t)))
 894                       ((integerp (car p))
 895                        (and (setq m (catch 'syntax
 896                                       (math-read-expr-level
 897                                        (car p)
 898                                        (if (cdr p)
 899                                            (if (consp (nth 1 p))
 900                                                (car (nth 1 (nth 1 p)))
 901                                              (nth 1 p))
 902                                          term))))
 903                             (not (stringp m))
 904                             (setq matches (nconc matches (list m)))))
 905                       ((eq (car (car p)) '\?)
 906                        (setq m (calc-match-user-syntax (nth 1 (car p))))
 907                        (or (nth 2 (car p))
 908                            (setq matches
 909                                  (nconc matches
 910                                         (list
 911                                          (cons 'vec (and (listp m) m))))))
 912                        (or (listp m) (not (nth 2 (car p)))
 913                            (not (eq (aref (car (nth 2 (car p))) 0) ?\$))
 914                            (eq exp-token 'end)))
 915                       (t
 916                        (setq m (calc-match-user-syntax (nth 1 (car p))
 917                                                        (car (nth 2 (car p)))))
 918                        (if (listp m)
 919                            (let ((vec (cons 'vec m))
 920                                  opos mm)
 921                              (while (and (listp
 922                                           (setq opos exp-pos
 923                                                 mm (calc-match-user-syntax
 924                                                     (or (nth 2 (car p))
 925                                                         (nth 1 (car p)))
 926                                                     (car (nth 2 (car p))))))
 927                                          (> exp-pos opos))
 928                                (setq vec (nconc vec mm)))
 929                              (setq matches (nconc matches (list vec))))
 930                          (and (eq (car (car p)) '*)
 931                               (setq matches (nconc matches (list '(vec)))))))))
 932       (setq p (cdr p)))
 933     (if p
 934         (setq exp-pos save-exp-pos
 935               exp-old-pos save-exp-old-pos
 936               exp-token save-exp-token
 937               exp-data save-exp-data
 938               matches "Failed"))
 939     matches)
 940 )
 941
 942 (defconst math-alg-inequalities
 943   '(calcFunc-lt calcFunc-gt calcFunc-leq calcFunc-geq
 944                 calcFunc-eq calcFunc-neq))
 945
 946 (defun math-remove-dashes (x)
 947   (if (string-match "\\`\\(.*\\)-\\(.*\\)\\'" x)
 948       (math-remove-dashes
 949        (concat (math-match-substring x 1) "#" (math-match-substring x 2)))
 950     x)
 951 )
 952
 953 (defun math-restore-dashes (x)
 954   (if (string-match "\\`\\(.*\\)[#_]\\(.*\\)\\'" x)
 955       (math-restore-dashes
 956        (concat (math-match-substring x 1) "-" (math-match-substring x 2)))
 957     x)
 958 )
 959
 960 (defun math-read-if (cond op)
 961   (let ((then (math-read-expr-level 0)))
 962     (or (equal exp-data ":")
 963         (throw 'syntax "Expected ':'"))
 964     (math-read-token)
 965     (list 'calcFunc-if cond then (math-read-expr-level (nth 3 op))))
 966 )
 967
 968 (defun math-factor-after ()
 969   (let ((exp-pos exp-pos)
 970         exp-old-pos exp-token exp-data)
 971     (math-read-token)
 972     (or (memq exp-token '(number symbol dollar hash string))
 973         (and (assoc exp-data '(("-") ("+") ("!") ("|") ("/")))
 974              (assoc (concat "u" exp-data) math-expr-opers))
 975         (eq (nth 2 (assoc exp-data math-expr-opers)) -1)
 976         (assoc exp-data '(("(") ("[") ("{")))))
 977 )
 978
 979 (defun math-read-factor ()
 980   (let (op)
 981     (cond ((eq exp-token 'number)
 982            (let ((num (math-read-number exp-data)))
 983              (if (not num)
 984                  (progn
 985                    (setq exp-old-pos exp-pos)
 986                    (throw 'syntax "Bad format")))
 987              (math-read-token)
 988              (if (and math-read-expr-quotes
 989                       (consp num))
 990                  (list 'quote num)
 991                num)))
 992           ((and calc-user-parse-table
 993                 (setq op (calc-check-user-syntax)))
 994            op)
 995           ((or (equal exp-data "-")
 996                (equal exp-data "+")
 997                (equal exp-data "!")
 998                (equal exp-data "|")
 999                (equal exp-data "/"))
1000            (setq exp-data (concat "u" exp-data))
1001            (math-read-factor))
1002           ((and (setq op (assoc exp-data math-expr-opers))
1003                 (eq (nth 2 op) -1))
1004            (if (consp (nth 1 op))
1005                (funcall (car (nth 1 op)) op)
1006              (math-read-token)
1007              (let ((val (math-read-expr-level (nth 3 op))))
1008                (cond ((eq (nth 1 op) 'ident)
1009                       val)
1010                      ((and (Math-numberp val)
1011                            (equal (car op) "u-"))
1012                       (math-neg val))
1013                      (t (list (nth 1 op) val))))))
1014           ((eq exp-token 'symbol)
1015            (let ((sym (intern exp-data)))
1016              (math-read-token)
1017              (if (equal exp-data calc-function-open)
1018                  (let ((f (assq sym math-expr-function-mapping)))
1019                    (math-read-token)
1020                    (if (consp (cdr f))
1021                        (funcall (car (cdr f)) f sym)
1022                      (let ((args (if (or (equal exp-data calc-function-close)
1023                                          (eq exp-token 'end))
1024                                      nil
1025                                    (math-read-expr-list))))
1026                        (if (not (or (equal exp-data calc-function-close)
1027                                     (eq exp-token 'end)))
1028                            (throw 'syntax "Expected `)'"))
1029                        (math-read-token)
1030                        (if (and (eq calc-language 'fortran) args
1031                                 (calc-extensions)
1032                                 (let ((calc-matrix-mode 'scalar))
1033                                   (math-known-matrixp
1034                                    (list 'var sym
1035                                          (intern
1036                                           (concat "var-"
1037                                                   (symbol-name sym)))))))
1038                            (math-parse-fortran-subscr sym args)
1039                          (if f
1040                              (setq sym (cdr f))
1041                            (and (= (aref (symbol-name sym) 0) ?\\)
1042                                 (< (prefix-numeric-value calc-language-option)
1043                                    0)
1044                                 (setq sym (intern (substring (symbol-name sym)
1045                                                              1))))
1046                            (or (string-match "-" (symbol-name sym))
1047                                (setq sym (intern
1048                                           (concat "calcFunc-"
1049                                                   (symbol-name sym))))))
1050                          (cons sym args)))))
1051                (if math-read-expr-quotes
1052                    sym
1053                  (let ((val (list 'var
1054                                   (intern (math-remove-dashes
1055                                            (symbol-name sym)))
1056                                   (if (string-match "-" (symbol-name sym))
1057                                       sym
1058                                     (intern (concat "var-"
1059                                                     (symbol-name sym)))))))
1060                    (let ((v (assq (nth 1 val) math-expr-variable-mapping)))
1061                      (and v (setq val (if (consp (cdr v))
1062                                           (funcall (car (cdr v)) v val)
1063                                         (list 'var
1064                                               (intern
1065                                                (substring (symbol-name (cdr v))
1066                                                           4))
1067                                               (cdr v))))))
1068                    (while (and (memq calc-language '(c pascal maple))
1069                                (equal exp-data "["))
1070                      (math-read-token)
1071                      (setq val (append (list 'calcFunc-subscr val)
1072                                        (math-read-expr-list)))
1073                      (if (equal exp-data "]")
1074                          (math-read-token)
1075                        (throw 'syntax "Expected ']'")))
1076                    val)))))
1077           ((eq exp-token 'dollar)
1078            (let ((abs (if (> exp-data 0) exp-data (- exp-data))))
1079              (if (>= (length calc-dollar-values) abs)
1080                  (let ((num exp-data))
1081                    (math-read-token)
1082                    (setq calc-dollar-used (max calc-dollar-used num))
1083                    (math-check-complete (nth (1- abs) calc-dollar-values)))
1084                (throw 'syntax (if calc-dollar-values
1085                                   "Too many $'s"
1086                                 "$'s not allowed in this context")))))
1087           ((eq exp-token 'hash)
1088            (or calc-hashes-used
1089                (throw 'syntax "#'s not allowed in this context"))
1090            (calc-extensions)
1091            (if (<= exp-data (length calc-arg-values))
1092                (let ((num exp-data))
1093                  (math-read-token)
1094                  (setq calc-hashes-used (max calc-hashes-used num))
1095                  (nth (1- num) calc-arg-values))
1096              (throw 'syntax "Too many # arguments")))
1097           ((equal exp-data "(")
1098            (let* ((exp (let ((exp-keep-spaces nil))
1099                          (math-read-token)
1100                          (if (or (equal exp-data "\\dots")
1101                                  (equal exp-data "\\ldots"))
1102                              '(neg (var inf var-inf))
1103                            (math-read-expr-level 0)))))
1104              (let ((exp-keep-spaces nil))
1105                (cond
1106                 ((equal exp-data ",")
1107                  (progn
1108                    (math-read-token)
1109                    (let ((exp2 (math-read-expr-level 0)))
1110                      (setq exp
1111                            (if (and exp2 (Math-realp exp) (Math-realp exp2))
1112                                (math-normalize (list 'cplx exp exp2))
1113                              (list '+ exp (list '* exp2 '(var i var-i))))))))
1114                 ((equal exp-data ";")
1115                  (progn
1116                    (math-read-token)
1117                    (let ((exp2 (math-read-expr-level 0)))
1118                      (setq exp (if (and exp2 (Math-realp exp)
1119                                         (Math-anglep exp2))
1120                                    (math-normalize (list 'polar exp exp2))
1121                                  (calc-extensions)
1122                                  (list '* exp
1123                                        (list 'calcFunc-exp
1124                                              (list '*
1125                                                    (math-to-radians-2 exp2)
1126                                                    '(var i var-i)))))))))
1127                 ((or (equal exp-data "\\dots")
1128                      (equal exp-data "\\ldots"))
1129                  (progn
1130                    (math-read-token)
1131                    (let ((exp2 (if (or (equal exp-data ")")
1132                                        (equal exp-data "]")
1133                                        (eq exp-token 'end))
1134                                    '(var inf var-inf)
1135                                  (math-read-expr-level 0))))
1136                      (setq exp
1137                            (list 'intv
1138                                  (if (equal exp-data ")") 0 1)
1139                                  exp
1140                                  exp2)))))))
1141              (if (not (or (equal exp-data ")")
1142                           (and (equal exp-data "]") (eq (car-safe exp) 'intv))
1143                           (eq exp-token 'end)))
1144                  (throw 'syntax "Expected `)'"))
1145              (math-read-token)
1146              exp))
1147           ((eq exp-token 'string)
1148            (calc-extensions)
1149            (math-read-string))
1150           ((equal exp-data "[")
1151            (calc-extensions)
1152            (math-read-brackets t "]"))
1153           ((equal exp-data "{")
1154            (calc-extensions)
1155            (math-read-brackets nil "}"))
1156           ((equal exp-data "<")
1157            (calc-extensions)
1158            (math-read-angle-brackets))
1159           (t (throw 'syntax "Expected a number"))))
1160 )
1161
1162
1163