Add a provide statement.

[gnu-emacs] / lisp / calc / calc-lang.el

;;; calc-lang.el --- calc language functions

;; Copyright (C) 1990, 1991, 1992, 1993, 2001 Free Software Foundation, Inc.

;; Author: David Gillespie <daveg@synaptics.com>
;; Maintainer: Jay Belanger <belanger@truman.edu>

;; This file is part of GNU Emacs.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY.  No author or distributor
;; accepts responsibility to anyone for the consequences of using it
;; or for whether it serves any particular purpose or works at all,
;; unless he says so in writing.  Refer to the GNU Emacs General Public
;; License for full details.

;; Everyone is granted permission to copy, modify and redistribute
;; GNU Emacs, but only under the conditions described in the
;; GNU Emacs General Public License.   A copy of this license is
;; supposed to have been given to you along with GNU Emacs so you
;; can know your rights and responsibilities.  It should be in a
;; file named COPYING.  Among other things, the copyright notice
;; and this notice must be preserved on all copies.

;;; Commentary:

;;; Code:


;; This file is autoloaded from calc-ext.el.
(require 'calc-ext)

(require 'calc-macs)

(defun calc-Need-calc-lang () nil)


;;; Alternate entry/display languages.

(defun calc-set-language (lang &optional option no-refresh)
  (setq math-expr-opers (or (get lang 'math-oper-table) math-standard-opers)
        math-expr-function-mapping (get lang 'math-function-table)
        math-expr-variable-mapping (get lang 'math-variable-table)
        calc-language-input-filter (get lang 'math-input-filter)
        calc-language-output-filter (get lang 'math-output-filter)
        calc-vector-brackets (or (get lang 'math-vector-brackets) "[]")
        calc-complex-format (get lang 'math-complex-format)
        calc-radix-formatter (get lang 'math-radix-formatter)
        calc-function-open (or (get lang 'math-function-open) "(")
        calc-function-close (or (get lang 'math-function-close) ")"))
  (if no-refresh
      (setq calc-language lang
            calc-language-option option)
    (calc-change-mode '(calc-language calc-language-option)
                      (list lang option) t)))

(defun calc-normal-language ()
  (interactive)
  (calc-wrapper
   (calc-set-language nil)
   (message "Normal language mode")))

(defun calc-flat-language ()
  (interactive)
  (calc-wrapper
   (calc-set-language 'flat)
   (message "Flat language mode (all stack entries shown on one line)")))

(defun calc-big-language ()
  (interactive)
  (calc-wrapper
   (calc-set-language 'big)
   (message "\"Big\" language mode")))

(defun calc-unformatted-language ()
  (interactive)
  (calc-wrapper
   (calc-set-language 'unform)
   (message "Unformatted language mode")))


(defun calc-c-language ()
  (interactive)
  (calc-wrapper
   (calc-set-language 'c)
   (message "`C' language mode")))

(put 'c 'math-oper-table
  '( ( "u+"    ident         -1 1000 )
     ( "u-"    neg           -1 1000 )
     ( "u!"    calcFunc-lnot -1 1000 )
     ( "~"     calcFunc-not  -1 1000 )
     ( "*"     *             190 191 )
     ( "/"     /             190 191 )
     ( "%"     %             190 191 )
     ( "+"     +             180 181 )
     ( "-"     -             180 181 )
     ( "<<"    calcFunc-lsh  170 171 )
     ( ">>"    calcFunc-rsh  170 171 )
     ( "<"     calcFunc-lt   160 161 )
     ( ">"     calcFunc-gt   160 161 )
     ( "<="    calcFunc-leq  160 161 )
     ( ">="    calcFunc-geq  160 161 )
     ( "=="    calcFunc-eq   150 151 )
     ( "!="    calcFunc-neq  150 151 )
     ( "&"     calcFunc-and  140 141 )
     ( "^"     calcFunc-xor  131 130 )
     ( "|"     calcFunc-or   120 121 )
     ( "&&"    calcFunc-land 110 111 )
     ( "||"    calcFunc-lor  100 101 )
     ( "?"     (math-read-if)  91  90 )
     ( "!!!"   calcFunc-pnot  -1  88 )
     ( "&&&"   calcFunc-pand  85  86 )
     ( "|||"   calcFunc-por   75  76 )
     ( "="     calcFunc-assign 51 50 )
     ( ":="    calcFunc-assign 51 50 )
     ( "::"    calcFunc-condition 45 46 ))) ; should support full assignments

(put 'c 'math-function-table
  '( ( acos        . calcFunc-arccos )
     ( acosh       . calcFunc-arccosh )
     ( asin        . calcFunc-arcsin )
     ( asinh       . calcFunc-arcsinh )
     ( atan        . calcFunc-arctan )
     ( atan2       . calcFunc-arctan2 )
     ( atanh       . calcFunc-arctanh )))

(put 'c 'math-variable-table
  '( ( M_PI        . var-pi )
     ( M_E         . var-e )))

(put 'c 'math-vector-brackets "{}")

(put 'c 'math-radix-formatter
     (function (lambda (r s)
                 (if (= r 16) (format "0x%s" s)
                   (if (= r 8) (format "0%s" s)
                     (format "%d#%s" r s))))))


(defun calc-pascal-language (n)
  (interactive "P")
  (calc-wrapper
   (and n (setq n (prefix-numeric-value n)))
   (calc-set-language 'pascal n)
   (message (if (and n (/= n 0))
                (if (> n 0)
                    "Pascal language mode (all uppercase)"
                  "Pascal language mode (all lowercase)")
              "Pascal language mode"))))

(put 'pascal 'math-oper-table
  '( ( "not"   calcFunc-lnot -1 1000 )
     ( "*"     *             190 191 )
     ( "/"     /             190 191 )
     ( "and"   calcFunc-and  190 191 )
     ( "div"   calcFunc-idiv 190 191 )
     ( "mod"   %             190 191 )
     ( "u+"    ident         -1  185 )
     ( "u-"    neg           -1  185 )
     ( "+"     +             180 181 )
     ( "-"     -             180 181 )
     ( "or"    calcFunc-or   180 181 )
     ( "xor"   calcFunc-xor  180 181 )
     ( "shl"   calcFunc-lsh  180 181 )
     ( "shr"   calcFunc-rsh  180 181 )
     ( "in"    calcFunc-in   160 161 )
     ( "<"     calcFunc-lt   160 161 )
     ( ">"     calcFunc-gt   160 161 )
     ( "<="    calcFunc-leq  160 161 )
     ( ">="    calcFunc-geq  160 161 )
     ( "="     calcFunc-eq   160 161 )
     ( "<>"    calcFunc-neq  160 161 )
     ( "!!!"   calcFunc-pnot  -1  85 )
     ( "&&&"   calcFunc-pand  80  81 )
     ( "|||"   calcFunc-por   75  76 )
     ( ":="    calcFunc-assign 51 50 )
     ( "::"    calcFunc-condition 45 46 )))

(put 'pascal 'math-input-filter 'calc-input-case-filter)
(put 'pascal 'math-output-filter 'calc-output-case-filter)

(put 'pascal 'math-radix-formatter
     (function (lambda (r s)
                 (if (= r 16) (format "$%s" s)
                   (format "%d#%s" r s)))))

(defun calc-input-case-filter (str)
  (cond ((or (null calc-language-option) (= calc-language-option 0))
         str)
        (t
         (downcase str))))

(defun calc-output-case-filter (str)
  (cond ((or (null calc-language-option) (= calc-language-option 0))
         str)
        ((> calc-language-option 0)
         (upcase str))
        (t
         (downcase str))))


(defun calc-fortran-language (n)
  (interactive "P")
  (calc-wrapper
   (and n (setq n (prefix-numeric-value n)))
   (calc-set-language 'fortran n)
   (message (if (and n (/= n 0))
                (if (> n 0)
                    "FORTRAN language mode (all uppercase)"
                  "FORTRAN language mode (all lowercase)")
              "FORTRAN language mode"))))

(put 'fortran 'math-oper-table
  '( ( "u/"    (math-parse-fortran-vector) -1 1 )
     ( "/"     (math-parse-fortran-vector-end) 1 -1 )
     ( "**"    ^             201 200 )
     ( "u+"    ident         -1  191 )
     ( "u-"    neg           -1  191 )
     ( "*"     *             190 191 )
     ( "/"     /             190 191 )
     ( "+"     +             180 181 )
     ( "-"     -             180 181 )
     ( ".LT."  calcFunc-lt   160 161 )
     ( ".GT."  calcFunc-gt   160 161 )
     ( ".LE."  calcFunc-leq  160 161 )
     ( ".GE."  calcFunc-geq  160 161 )
     ( ".EQ."  calcFunc-eq   160 161 )
     ( ".NE."  calcFunc-neq  160 161 )
     ( ".NOT." calcFunc-lnot -1  121 )
     ( ".AND." calcFunc-land 110 111 )
     ( ".OR."  calcFunc-lor  100 101 )
     ( "!!!"   calcFunc-pnot  -1  85 )
     ( "&&&"   calcFunc-pand  80  81 )
     ( "|||"   calcFunc-por   75  76 )
     ( "="     calcFunc-assign 51 50 )
     ( ":="    calcFunc-assign 51 50 )
     ( "::"    calcFunc-condition 45 46 )))

(put 'fortran 'math-vector-brackets "//")

(put 'fortran 'math-function-table
  '( ( acos        . calcFunc-arccos )
     ( acosh       . calcFunc-arccosh )
     ( aimag       . calcFunc-im )
     ( aint        . calcFunc-ftrunc )
     ( asin        . calcFunc-arcsin )
     ( asinh       . calcFunc-arcsinh )
     ( atan        . calcFunc-arctan )
     ( atan2       . calcFunc-arctan2 )
     ( atanh       . calcFunc-arctanh )
     ( conjg       . calcFunc-conj )
     ( log         . calcFunc-ln )
     ( nint        . calcFunc-round )
     ( real        . calcFunc-re )))

(put 'fortran 'math-input-filter 'calc-input-case-filter)
(put 'fortran 'math-output-filter 'calc-output-case-filter)

;; The next few variables are local to math-read-exprs in calc-aent.el 
;; and math-read-expr in calc-ext.el, but are set in functions they call.

(defvar math-exp-token)
(defvar math-expr-data)
(defvar math-exp-old-pos)

(defvar math-parsing-fortran-vector nil)
(defun math-parse-fortran-vector (op)
  (let ((math-parsing-fortran-vector '(end . "\000")))
    (prog1
        (math-read-brackets t "]")
      (setq math-exp-token (car math-parsing-fortran-vector)
            math-expr-data (cdr math-parsing-fortran-vector)))))

(defun math-parse-fortran-vector-end (x op)
  (if math-parsing-fortran-vector
      (progn
        (setq math-parsing-fortran-vector (cons math-exp-token math-expr-data)
              math-exp-token 'end
              math-expr-data "\000")
        x)
    (throw 'syntax "Unmatched closing `/'")))

(defun math-parse-fortran-subscr (sym args)
  (setq sym (math-build-var-name sym))
  (while args
    (setq sym (list 'calcFunc-subscr sym (car args))
          args (cdr args)))
  sym)


(defun calc-tex-language (n)
  (interactive "P")
  (calc-wrapper
   (and n (setq n (prefix-numeric-value n)))
   (calc-set-language 'tex n)
   (message (if (and n (/= n 0))
                (if (> n 0)
                    "TeX language mode with \\hbox{func}(\\hbox{var})"
                  "TeX language mode with \\func{\\hbox{var}}")
              "TeX language mode"))))

(put 'tex 'math-oper-table
  '( ( "u+"       ident            -1 1000 )
     ( "u-"       neg              -1 1000 )
     ( "\\hat"    calcFunc-hat     -1  950 )
     ( "\\check"  calcFunc-check   -1  950 )
     ( "\\tilde"  calcFunc-tilde   -1  950 )
     ( "\\acute"  calcFunc-acute   -1  950 )
     ( "\\grave"  calcFunc-grave   -1  950 )
     ( "\\dot"    calcFunc-dot     -1  950 )
     ( "\\ddot"   calcFunc-dotdot  -1  950 )
     ( "\\breve"  calcFunc-breve   -1  950 )
     ( "\\bar"    calcFunc-bar     -1  950 )
     ( "\\vec"    calcFunc-Vec     -1  950 )
     ( "\\underline" calcFunc-under -1  950 )
     ( "u|"       calcFunc-abs     -1    0 )
     ( "|"        closing           0   -1 )
     ( "\\lfloor" calcFunc-floor   -1    0 )
     ( "\\rfloor" closing           0   -1 )
     ( "\\lceil"  calcFunc-ceil    -1    0 )
     ( "\\rceil"  closing           0   -1 )
     ( "\\pm"     sdev             300 300 )
     ( "!"        calcFunc-fact    210  -1 )
     ( "^"        ^                201 200 )
     ( "_"        calcFunc-subscr  201 200 )
     ( "\\times"  *                191 190 )
     ( "*"        *                191 190 )
     ( "2x"       *                191 190 )
     ( "+"        +                180 181 )
     ( "-"        -                180 181 )
     ( "\\over"   /                170 171 )
     ( "/"        /                170 171 )
     ( "\\choose" calcFunc-choose  170 171 )
     ( "\\mod"    %                170 171 )
     ( "<"        calcFunc-lt      160 161 )
     ( ">"        calcFunc-gt      160 161 )
     ( "\\leq"    calcFunc-leq     160 161 )
     ( "\\geq"    calcFunc-geq     160 161 )
     ( "="        calcFunc-eq      160 161 )
     ( "\\neq"    calcFunc-neq     160 161 )
     ( "\\ne"     calcFunc-neq     160 161 )
     ( "\\lnot"   calcFunc-lnot     -1 121 )
     ( "\\land"   calcFunc-land    110 111 )
     ( "\\lor"    calcFunc-lor     100 101 )
     ( "?"        (math-read-if)    91  90 )
     ( "!!!"      calcFunc-pnot     -1  85 )
     ( "&&&"      calcFunc-pand     80  81 )
     ( "|||"      calcFunc-por      75  76 )
     ( "\\gets"   calcFunc-assign   51  50 )
     ( ":="       calcFunc-assign   51  50 )
     ( "::"       calcFunc-condition 45 46 )
     ( "\\to"     calcFunc-evalto   40  41 )
     ( "\\to"     calcFunc-evalto   40  -1 )
     ( "=>"       calcFunc-evalto   40  41 )
     ( "=>"       calcFunc-evalto   40  -1 )))

(put 'tex 'math-function-table
  '( ( \\arccos    . calcFunc-arccos )
     ( \\arcsin    . calcFunc-arcsin )
     ( \\arctan    . calcFunc-arctan )
     ( \\arg       . calcFunc-arg )
     ( \\cos       . calcFunc-cos )
     ( \\cosh      . calcFunc-cosh )
     ( \\det       . calcFunc-det )
     ( \\exp       . calcFunc-exp )
     ( \\gcd       . calcFunc-gcd )
     ( \\ln        . calcFunc-ln )
     ( \\log       . calcFunc-log10 )
     ( \\max       . calcFunc-max )
     ( \\min       . calcFunc-min )
     ( \\tan       . calcFunc-tan )
     ( \\sin       . calcFunc-sin )
     ( \\sinh      . calcFunc-sinh )
     ( \\sqrt      . calcFunc-sqrt )
     ( \\tanh      . calcFunc-tanh )
     ( \\phi       . calcFunc-totient )
     ( \\mu        . calcFunc-moebius )))

(put 'tex 'math-variable-table
  '( ( \\pi        . var-pi )
     ( \\infty     . var-inf )
     ( \\infty     . var-uinf )
     ( \\phi       . var-phi )
     ( \\gamma     . var-gamma )
     ( \\sum       . (math-parse-tex-sum calcFunc-sum) )
     ( \\prod      . (math-parse-tex-sum calcFunc-prod) )))

(put 'tex 'math-complex-format 'i)

(defun math-parse-tex-sum (f val)
  (let (low high save)
    (or (equal math-expr-data "_") (throw 'syntax "Expected `_'"))
    (math-read-token)
    (setq save math-exp-old-pos)
    (setq low (math-read-factor))
    (or (eq (car-safe low) 'calcFunc-eq)
        (progn
          (setq math-exp-old-pos (1+ save))
          (throw 'syntax "Expected equation")))
    (or (equal math-expr-data "^") (throw 'syntax "Expected `^'"))
    (math-read-token)
    (setq high (math-read-factor))
    (list (nth 2 f) (math-read-factor) (nth 1 low) (nth 2 low) high)))

(defun math-tex-input-filter (str)   ; allow parsing of 123\,456\,789.
  (while (string-match "[0-9]\\\\,[0-9]" str)
    (setq str (concat (substring str 0 (1+ (match-beginning 0)))
                      (substring str (1- (match-end 0))))))
  str)
(put 'tex 'math-input-filter 'math-tex-input-filter)


(defun calc-eqn-language (n)
  (interactive "P")
  (calc-wrapper
   (calc-set-language 'eqn)
   (message "Eqn language mode")))

(put 'eqn 'math-oper-table
  '( ( "u+"       ident            -1 1000 )
     ( "u-"       neg              -1 1000 )
     ( "prime"    (math-parse-eqn-prime) 950  -1 )
     ( "prime"    calcFunc-Prime   950  -1 )
     ( "dot"      calcFunc-dot     950  -1 )
     ( "dotdot"   calcFunc-dotdot  950  -1 )
     ( "hat"      calcFunc-hat     950  -1 )
     ( "tilde"    calcFunc-tilde   950  -1 )
     ( "vec"      calcFunc-Vec     950  -1 )
     ( "dyad"     calcFunc-dyad    950  -1 )
     ( "bar"      calcFunc-bar     950  -1 )
     ( "under"    calcFunc-under   950  -1 )
     ( "sub"      calcFunc-subscr  931 930 )
     ( "sup"      ^                921 920 )
     ( "sqrt"     calcFunc-sqrt    -1  910 )
     ( "over"     /                900 901 )
     ( "u|"       calcFunc-abs     -1    0 )
     ( "|"        closing           0   -1 )
     ( "left floor"  calcFunc-floor -1   0 )
     ( "right floor" closing        0   -1 )
     ( "left ceil"   calcFunc-ceil  -1   0 )
     ( "right ceil"  closing        0   -1 )
     ( "+-"       sdev             300 300 )
     ( "!"        calcFunc-fact    210  -1 )
     ( "times"    *                191 190 )
     ( "*"        *                191 190 )
     ( "2x"       *                191 190 )
     ( "/"        /                180 181 )
     ( "%"        %                180 181 )
     ( "+"        +                170 171 )
     ( "-"        -                170 171 )
     ( "<"        calcFunc-lt      160 161 )
     ( ">"        calcFunc-gt      160 161 )
     ( "<="       calcFunc-leq     160 161 )
     ( ">="       calcFunc-geq     160 161 )
     ( "="        calcFunc-eq      160 161 )
     ( "=="       calcFunc-eq      160 161 )
     ( "!="       calcFunc-neq     160 161 )
     ( "u!"       calcFunc-lnot     -1 121 )
     ( "&&"       calcFunc-land    110 111 )
     ( "||"       calcFunc-lor     100 101 )
     ( "?"        (math-read-if)    91  90 )
     ( "!!!"      calcFunc-pnot     -1  85 )
     ( "&&&"      calcFunc-pand     80  81 )
     ( "|||"      calcFunc-por      75  76 )
     ( "<-"       calcFunc-assign   51  50 )
     ( ":="       calcFunc-assign   51  50 )
     ( "::"       calcFunc-condition 45 46 )
     ( "->"       calcFunc-evalto   40  41 )
     ( "->"       calcFunc-evalto   40  -1 )
     ( "=>"       calcFunc-evalto   40  41 )
     ( "=>"       calcFunc-evalto   40  -1 )))

(put 'eqn 'math-function-table
  '( ( arc\ cos    . calcFunc-arccos )
     ( arc\ cosh   . calcFunc-arccosh )
     ( arc\ sin    . calcFunc-arcsin )
     ( arc\ sinh   . calcFunc-arcsinh )
     ( arc\ tan    . calcFunc-arctan )
     ( arc\ tanh   . calcFunc-arctanh )
     ( GAMMA       . calcFunc-gamma )
     ( phi         . calcFunc-totient )
     ( mu          . calcFunc-moebius )
     ( matrix      . (math-parse-eqn-matrix) )))

(put 'eqn 'math-variable-table
  '( ( inf         . var-uinf )))

(put 'eqn 'math-complex-format 'i)

(defun math-parse-eqn-matrix (f sym)
  (let ((vec nil))
    (while (assoc math-expr-data '(("ccol") ("lcol") ("rcol")))
      (math-read-token)
      (or (equal math-expr-data calc-function-open)
          (throw 'syntax "Expected `{'"))
      (math-read-token)
      (setq vec (cons (cons 'vec (math-read-expr-list)) vec))
      (or (equal math-expr-data calc-function-close)
          (throw 'syntax "Expected `}'"))
      (math-read-token))
    (or (equal math-expr-data calc-function-close)
        (throw 'syntax "Expected `}'"))
    (math-read-token)
    (math-transpose (cons 'vec (nreverse vec)))))

(defun math-parse-eqn-prime (x sym)
  (if (eq (car-safe x) 'var)
      (if (equal math-expr-data calc-function-open)
          (progn
            (math-read-token)
            (let ((args (if (or (equal math-expr-data calc-function-close)
                                (eq math-exp-token 'end))
                            nil
                          (math-read-expr-list))))
              (if (not (or (equal math-expr-data calc-function-close)
                           (eq math-exp-token 'end)))
                  (throw 'syntax "Expected `)'"))
              (math-read-token)
              (cons (intern (format "calcFunc-%s'" (nth 1 x))) args)))
        (list 'var
              (intern (concat (symbol-name (nth 1 x)) "'"))
              (intern (concat (symbol-name (nth 2 x)) "'"))))
    (list 'calcFunc-Prime x)))


(defun calc-mathematica-language ()
  (interactive)
  (calc-wrapper
   (calc-set-language 'math)
   (message "Mathematica language mode")))

(put 'math 'math-oper-table
  '( ( "[["    (math-read-math-subscr) 250 -1 )
     ( "!"     calcFunc-fact  210 -1 )
     ( "!!"    calcFunc-dfact 210 -1 )
     ( "^"     ^             201 200 )
     ( "u+"    ident         -1  197 )
     ( "u-"    neg           -1  197 )
     ( "/"     /             195 196 )
     ( "*"     *             190 191 )
     ( "2x"    *             190 191 )
     ( "+"     +             180 181 )
     ( "-"     -             180 181 )
     ( "<"     calcFunc-lt   160 161 )
     ( ">"     calcFunc-gt   160 161 )
     ( "<="    calcFunc-leq  160 161 )
     ( ">="    calcFunc-geq  160 161 )
     ( "=="    calcFunc-eq   150 151 )
     ( "!="    calcFunc-neq  150 151 )
     ( "u!"    calcFunc-lnot -1  121 )
     ( "&&"    calcFunc-land 110 111 )
     ( "||"    calcFunc-lor  100 101 )
     ( "!!!"   calcFunc-pnot  -1  85 )
     ( "&&&"   calcFunc-pand  80  81 )
     ( "|||"   calcFunc-por   75  76 )
     ( ":="    calcFunc-assign 51 50 )
     ( "="     calcFunc-assign 51 50 )
     ( "->"    calcFunc-assign 51 50 )
     ( ":>"    calcFunc-assign 51 50 )
     ( "::"    calcFunc-condition 45 46 )
))

(put 'math 'math-function-table
  '( ( Abs         . calcFunc-abs )
     ( ArcCos      . calcFunc-arccos )
     ( ArcCosh     . calcFunc-arccosh )
     ( ArcSin      . calcFunc-arcsin )
     ( ArcSinh     . calcFunc-arcsinh )
     ( ArcTan      . calcFunc-arctan )
     ( ArcTanh     . calcFunc-arctanh )
     ( Arg         . calcFunc-arg )
     ( Binomial    . calcFunc-choose )
     ( Ceiling     . calcFunc-ceil )
     ( Conjugate   . calcFunc-conj )
     ( Cos         . calcFunc-cos )
     ( Cosh        . calcFunc-cosh )
     ( D           . calcFunc-deriv )
     ( Dt          . calcFunc-tderiv )
     ( Det         . calcFunc-det )
     ( Exp         . calcFunc-exp )
     ( EulerPhi    . calcFunc-totient )
     ( Floor       . calcFunc-floor )
     ( Gamma       . calcFunc-gamma )
     ( GCD         . calcFunc-gcd )
     ( If          . calcFunc-if )
     ( Im          . calcFunc-im )
     ( Inverse     . calcFunc-inv )
     ( Integrate   . calcFunc-integ )
     ( Join        . calcFunc-vconcat )
     ( LCM         . calcFunc-lcm )
     ( Log         . calcFunc-ln )
     ( Max         . calcFunc-max )
     ( Min         . calcFunc-min )
     ( Mod         . calcFunc-mod )
     ( MoebiusMu   . calcFunc-moebius )
     ( Random      . calcFunc-random )
     ( Round       . calcFunc-round )
     ( Re          . calcFunc-re )
     ( Sign        . calcFunc-sign )
     ( Sin         . calcFunc-sin )
     ( Sinh        . calcFunc-sinh )
     ( Sqrt        . calcFunc-sqrt )
     ( Tan         . calcFunc-tan )
     ( Tanh        . calcFunc-tanh )
     ( Transpose   . calcFunc-trn )
     ( Length      . calcFunc-vlen )
))

(put 'math 'math-variable-table
  '( ( I           . var-i )
     ( Pi          . var-pi )
     ( E           . var-e )
     ( GoldenRatio . var-phi )
     ( EulerGamma  . var-gamma )
     ( Infinity    . var-inf )
     ( ComplexInfinity . var-uinf )
     ( Indeterminate . var-nan )
))

(put 'math 'math-vector-brackets "{}")
(put 'math 'math-complex-format 'I)
(put 'math 'math-function-open "[")
(put 'math 'math-function-close "]")

(put 'math 'math-radix-formatter
     (function (lambda (r s) (format "%d^^%s" r s))))

(defun math-read-math-subscr (x op)
  (let ((idx (math-read-expr-level 0)))
    (or (and (equal math-expr-data "]")
             (progn
               (math-read-token)
               (equal math-expr-data "]")))
        (throw 'syntax "Expected ']]'"))
    (math-read-token)
    (list 'calcFunc-subscr x idx)))


(defun calc-maple-language ()
  (interactive)
  (calc-wrapper
   (calc-set-language 'maple)
   (message "Maple language mode")))

(put 'maple 'math-oper-table
  '( ( "matrix" ident        -1  300 )
     ( "MATRIX" ident        -1  300 )
     ( "!"     calcFunc-fact  210 -1 )
     ( "^"     ^             201 200 )
     ( "**"    ^             201 200 )
     ( "u+"    ident         -1  197 )
     ( "u-"    neg           -1  197 )
     ( "/"     /             191 192 )
     ( "*"     *             191 192 )
     ( "intersect" calcFunc-vint 191 192 )
     ( "+"     +             180 181 )
     ( "-"     -             180 181 )
     ( "union" calcFunc-vunion 180 181 )
     ( "minus" calcFunc-vdiff 180 181 )
     ( "mod"   %             170 170 )
     ( ".."    (math-read-maple-dots) 165 165 )
     ( "\\dots" (math-read-maple-dots) 165 165 )
     ( "<"     calcFunc-lt   160 160 )
     ( ">"     calcFunc-gt   160 160 )
     ( "<="    calcFunc-leq  160 160 )
     ( ">="    calcFunc-geq  160 160 )
     ( "="     calcFunc-eq   160 160 )
     ( "<>"    calcFunc-neq  160 160 )
     ( "not"   calcFunc-lnot -1  121 )
     ( "and"   calcFunc-land 110 111 )
     ( "or"    calcFunc-lor  100 101 )
     ( "!!!"   calcFunc-pnot  -1  85 )
     ( "&&&"   calcFunc-pand  80  81 )
     ( "|||"   calcFunc-por   75  76 )
     ( ":="    calcFunc-assign 51 50 )
     ( "::"    calcFunc-condition 45 46 )
))

(put 'maple 'math-function-table
  '( ( bernoulli   . calcFunc-bern )
     ( binomial    . calcFunc-choose )
     ( diff        . calcFunc-deriv )
     ( GAMMA       . calcFunc-gamma )
     ( ifactor     . calcFunc-prfac )
     ( igcd        . calcFunc-gcd )
     ( ilcm        . calcFunc-lcm )
     ( int         . calcFunc-integ )
     ( modp        . % )
     ( irem        . % )
     ( iquo        . calcFunc-idiv )
     ( isprime     . calcFunc-prime )
     ( length      . calcFunc-vlen )
     ( member      . calcFunc-in )
     ( crossprod   . calcFunc-cross )
     ( inverse     . calcFunc-inv )
     ( trace       . calcFunc-tr )
     ( transpose   . calcFunc-trn )
     ( vectdim     . calcFunc-vlen )
))

(put 'maple 'math-variable-table
  '( ( I           . var-i )
     ( Pi          . var-pi )
     ( E           . var-e )
     ( infinity    . var-inf )
     ( infinity    . var-uinf )
     ( infinity    . var-nan )
))

(put 'maple 'math-complex-format 'I)

(defun math-read-maple-dots (x op)
  (list 'intv 3 x (math-read-expr-level (nth 3 op))))


;; The variable math-read-big-lines is local to math-read-big-expr in
;; calc-ext.el, but is used by math-read-big-rec, math-read-big-char,
;; math-read-big-emptyp, math-read-big-error and math-read-big-balance,
;; which are called (directly and indirectly) by math-read-big-expr.
;; It is also local to math-read-big-bigp in calc-ext.el, which calls
;; math-read-big-balance.
(defvar math-read-big-lines)

;; The variables math-read-big-baseline and math-read-big-h2 are
;; local to math-read-big-expr in calc-ext.el, but used by
;; math-read-big-rec.
(defvar math-read-big-baseline)
(defvar math-read-big-h2)

;; The variables math-rb-h1, math-rb-h2, math-rb-v1 and math-rb-v2 
;; are local to math-read-big-rec, but are used by math-read-big-char, 
;; math-read-big-emptyp and math-read-big-balance which are called by 
;; math-read-big-rec.
;; math-rb-h2 is also local to math-read-big-bigp in calc-ext.el,
;; which calls math-read-big-balance.
(defvar math-rb-h1)
(defvar math-rb-h2)
(defvar math-rb-v1)
(defvar math-rb-v2)

(defun math-read-big-rec (math-rb-h1 math-rb-v1 math-rb-h2 math-rb-v2 
                                     &optional baseline prec short)
  (or prec (setq prec 0))

  ;; Clip whitespace above or below.
  (while (and (< math-rb-v1 math-rb-v2) 
              (math-read-big-emptyp math-rb-h1 math-rb-v1 math-rb-h2 (1+ math-rb-v1)))
    (setq math-rb-v1 (1+ math-rb-v1)))
  (while (and (< math-rb-v1 math-rb-v2) 
              (math-read-big-emptyp math-rb-h1 (1- math-rb-v2) math-rb-h2 math-rb-v2))
    (setq math-rb-v2 (1- math-rb-v2)))

  ;; If formula is a single line high, normal parser can handle it.
  (if (<= math-rb-v2 (1+ math-rb-v1))
      (if (or (<= math-rb-v2 math-rb-v1)
              (> math-rb-h1 (length (setq math-rb-v2 
                                          (nth math-rb-v1 math-read-big-lines)))))
          (math-read-big-error math-rb-h1 math-rb-v1)
        (setq math-read-big-baseline math-rb-v1
              math-read-big-h2 math-rb-h2
              math-rb-v2 (nth math-rb-v1 math-read-big-lines)
              math-rb-h2 (math-read-expr 
                          (substring math-rb-v2 math-rb-h1 
                                     (min math-rb-h2 (length math-rb-v2)))))
        (if (eq (car-safe math-rb-h2) 'error)
            (math-read-big-error (+ math-rb-h1 (nth 1 math-rb-h2)) 
                                 math-rb-v1 (nth 2 math-rb-h2))
          math-rb-h2))

    ;; Clip whitespace at left or right.
    (while (and (< math-rb-h1 math-rb-h2) 
                (math-read-big-emptyp math-rb-h1 math-rb-v1 (1+ math-rb-h1) math-rb-v2))
      (setq math-rb-h1 (1+ math-rb-h1)))
    (while (and (< math-rb-h1 math-rb-h2) 
                (math-read-big-emptyp (1- math-rb-h2) math-rb-v1 math-rb-h2 math-rb-v2))
      (setq math-rb-h2 (1- math-rb-h2)))

    ;; Scan to find widest left-justified "----" in the region.
    (let* ((widest nil)
           (widest-h2 0)
           (lines-v1 (nthcdr math-rb-v1 math-read-big-lines))
           (p lines-v1)
           (v math-rb-v1)
           (other-v nil)
           other-char line len h)
      (while (< v math-rb-v2)
        (setq line (car p)
              len (min math-rb-h2 (length line)))
        (and (< math-rb-h1 len)
             (/= (aref line math-rb-h1) ?\ )
             (if (and (= (aref line math-rb-h1) ?\-)
                      ;; Make sure it's not a minus sign.
                      (or (and (< (1+ math-rb-h1) len) 
                               (= (aref line (1+ math-rb-h1)) ?\-))
                          (/= (math-read-big-char math-rb-h1 (1- v)) ?\ )
                          (/= (math-read-big-char math-rb-h1 (1+ v)) ?\ )))
                 (progn
                   (setq h math-rb-h1)
                   (while (and (< (setq h (1+ h)) len)
                               (= (aref line h) ?\-)))
                   (if (> h widest-h2)
                       (setq widest v
                             widest-h2 h)))
               (or other-v (setq other-v v other-char (aref line math-rb-h1)))))
        (setq v (1+ v)
              p (cdr p)))

      (cond ((not (setq v other-v))
             (math-read-big-error math-rb-h1 math-rb-v1))   ; Should never happen!

            ;; Quotient.
            (widest
             (setq h widest-h2
                   v widest)
             (let ((num (math-read-big-rec math-rb-h1 math-rb-v1 h v))
                   (den (math-read-big-rec math-rb-h1 (1+ v) h math-rb-v2)))
               (setq p (if (and (math-integerp num) (math-integerp den))
                           (math-make-frac num den)
                         (list '/ num den)))))

            ;; Big radical sign.
            ((= other-char ?\\)
             (or (= (math-read-big-char (1+ math-rb-h1) v) ?\|)
                 (math-read-big-error (1+ math-rb-h1) v "Malformed root sign"))
             (math-read-big-emptyp math-rb-h1 math-rb-v1 (1+ math-rb-h1) v nil t)
             (while (= (math-read-big-char (1+ math-rb-h1) (setq v (1- v))) ?\|))
             (or (= (math-read-big-char (setq h (+ math-rb-h1 2)) v) ?\_)
                 (math-read-big-error h v "Malformed root sign"))
             (while (= (math-read-big-char (setq h (1+ h)) v) ?\_))
             (math-read-big-emptyp math-rb-h1 math-rb-v1 (1+ math-rb-h1) v nil t)
             (math-read-big-emptyp math-rb-h1 (1+ other-v) h math-rb-v2 nil t)
             (setq p (list 'calcFunc-sqrt (math-read-big-rec
                                           (+ math-rb-h1 2) (1+ v)
                                           h (1+ other-v) baseline))
                   v math-read-big-baseline))

            ;; Small radical sign.
            ((and (= other-char ?V)
                  (= (math-read-big-char (1+ math-rb-h1) (1- v)) ?\_))
             (setq h (1+ math-rb-h1))
             (math-read-big-emptyp math-rb-h1 math-rb-v1 h (1- v) nil t)
             (math-read-big-emptyp math-rb-h1 (1+ v) h math-rb-v2 nil t)
             (math-read-big-emptyp math-rb-h1 math-rb-v1 (1+ math-rb-h1) v nil t)
             (while (= (math-read-big-char (setq h (1+ h)) (1- v)) ?\_))
             (setq p (list 'calcFunc-sqrt (math-read-big-rec
                                           (1+ math-rb-h1) v h (1+ v) t))
                   v math-read-big-baseline))

            ;; Binomial coefficient.
            ((and (= other-char ?\()
                  (= (math-read-big-char (1+ math-rb-h1) v) ?\ )
                  (= (string-match "( *)" (nth v math-read-big-lines) 
                                   math-rb-h1) math-rb-h1))
             (setq h (match-end 0))
             (math-read-big-emptyp math-rb-h1 math-rb-v1 (1+ math-rb-h1) v nil t)
             (math-read-big-emptyp math-rb-h1 (1+ v) (1+ math-rb-h1) math-rb-v2 nil t)
             (math-read-big-emptyp (1- h) math-rb-v1 h v nil t)
             (math-read-big-emptyp (1- h) (1+ v) h math-rb-v2 nil t)
             (setq p (list 'calcFunc-choose
                           (math-read-big-rec (1+ math-rb-h1) math-rb-v1 (1- h) v)
                           (math-read-big-rec (1+ math-rb-h1) (1+ v)
                                              (1- h) math-rb-v2))))

            ;; Minus sign.
            ((= other-char ?\-)
             (setq p (list 'neg (math-read-big-rec (1+ math-rb-h1) math-rb-v1 
                                                   math-rb-h2 math-rb-v2 v 250 t))
                   v math-read-big-baseline
                   h math-read-big-h2))

            ;; Parentheses.
            ((= other-char ?\()
             (math-read-big-emptyp math-rb-h1 math-rb-v1 (1+ math-rb-h1) v nil t)
             (math-read-big-emptyp math-rb-h1 (1+ v) (1+ math-rb-h1) math-rb-v2 nil t)
             (setq h (math-read-big-balance (1+ math-rb-h1) v "(" t))
             (math-read-big-emptyp (1- h) math-rb-v1 h v nil t)
             (math-read-big-emptyp (1- h) (1+ v) h math-rb-v2 nil t)
             (let ((sep (math-read-big-char (1- h) v))
                   hmid)
               (if (= sep ?\.)
                   (setq h (1+ h)))
               (if (= sep ?\])
                   (math-read-big-error (1- h) v "Expected `)'"))
               (if (= sep ?\))
                   (setq p (math-read-big-rec 
                            (1+ math-rb-h1) math-rb-v1 (1- h) math-rb-v2 v))
                 (setq hmid (math-read-big-balance h v "(")
                       p (list p 
                               (math-read-big-rec h math-rb-v1 (1- hmid) math-rb-v2 v))
                       h hmid)
                 (cond ((= sep ?\.)
                        (setq p (cons 'intv (cons (if (= (math-read-big-char
                                                          (1- h) v)
                                                         ?\))
                                                      0 1)
                                                  p))))
                       ((= (math-read-big-char (1- h) v) ?\])
                        (math-read-big-error (1- h) v "Expected `)'"))
                       ((= sep ?\,)
                        (or (and (math-realp (car p)) (math-realp (nth 1 p)))
                            (math-read-big-error
                             math-rb-h1 v "Complex components must be real"))
                        (setq p (cons 'cplx p)))
                       ((= sep ?\;)
                        (or (and (math-realp (car p)) (math-anglep (nth 1 p)))
                            (math-read-big-error
                             math-rb-h1 v "Complex components must be real"))
                        (setq p (cons 'polar p)))))))

            ;; Matrix.
            ((and (= other-char ?\[)
                  (or (= (math-read-big-char (setq h math-rb-h1) (1+ v)) ?\[)
                      (= (math-read-big-char (setq h (1+ h)) v) ?\[)
                      (and (= (math-read-big-char h v) ?\ )
                           (= (math-read-big-char (setq h (1+ h)) v) ?\[)))
                  (= (math-read-big-char h (1+ v)) ?\[))
             (math-read-big-emptyp math-rb-h1 math-rb-v1 h v nil t)
             (let ((vtop v)
                   (hleft h)
                   (hright nil))
               (setq p nil)
               (while (progn
                        (setq h (math-read-big-balance (1+ hleft) v "["))
                        (if hright
                            (or (= h hright)
                                (math-read-big-error hright v "Expected `]'"))
                          (setq hright h))
                        (setq p (cons (math-read-big-rec
                                       hleft v h (1+ v)) p))
                        (and (memq (math-read-big-char h v) '(?\  ?\,))
                             (= (math-read-big-char hleft (1+ v)) ?\[)))
                 (setq v (1+ v)))
               (or (= hleft math-rb-h1)
                   (progn
                     (if (= (math-read-big-char h v) ?\ )
                         (setq h (1+ h)))
                     (and (= (math-read-big-char h v) ?\])
                          (setq h (1+ h))))
                   (math-read-big-error (1- h) v "Expected `]'"))
               (if (= (math-read-big-char h vtop) ?\,)
                   (setq h (1+ h)))
               (math-read-big-emptyp math-rb-h1 (1+ v) (1- h) math-rb-v2 nil t)
               (setq v (+ vtop (/ (- v vtop) 2))
                     p (cons 'vec (nreverse p)))))

            ;; Square brackets.
            ((= other-char ?\[)
             (math-read-big-emptyp math-rb-h1 math-rb-v1 (1+ math-rb-h1) v nil t)
             (math-read-big-emptyp math-rb-h1 (1+ v) (1+ math-rb-h1) math-rb-v2 nil t)
             (setq p nil
                   h (1+ math-rb-h1))
             (while (progn
                      (setq widest (math-read-big-balance h v "[" t))
                      (math-read-big-emptyp (1- h) math-rb-v1 h v nil t)
                      (math-read-big-emptyp (1- h) (1+ v) h math-rb-v2 nil t)
                      (setq p (cons (math-read-big-rec
                                     h math-rb-v1 (1- widest) math-rb-v2 v) p)
                            h widest)
                      (= (math-read-big-char (1- h) v) ?\,)))
             (setq widest (math-read-big-char (1- h) v))
             (if (or (memq widest '(?\; ?\)))
                     (and (eq widest ?\.) (cdr p)))
                 (math-read-big-error (1- h) v "Expected `]'"))
             (if (= widest ?\.)
                 (setq h (1+ h)
                       widest (math-read-big-balance h v "[")
                       p (nconc p (list (math-read-big-rec
                                         h math-rb-v1 (1- widest) math-rb-v2 v)))
                       h widest
                       p (cons 'intv (cons (if (= (math-read-big-char (1- h) v)
                                                  ?\])
                                               3 2)
                                           p)))
               (setq p (cons 'vec (nreverse p)))))

            ;; Date form.
            ((= other-char ?\<)
             (setq line (nth v math-read-big-lines))
             (string-match ">" line math-rb-h1)
             (setq h (match-end 0))
             (math-read-big-emptyp math-rb-h1 math-rb-v1 h v nil t)
             (math-read-big-emptyp math-rb-h1 (1+ v) h math-rb-v2 nil t)
             (setq p (math-read-big-rec math-rb-h1 v h (1+ v) v)))

            ;; Variable name or function call.
            ((or (and (>= other-char ?a) (<= other-char ?z))
                 (and (>= other-char ?A) (<= other-char ?Z)))
             (setq line (nth v math-read-big-lines))
             (string-match "\\([a-zA-Z'_]+\\) *" line math-rb-h1)
             (setq h (match-end 1)
                   widest (match-end 0)
                   p (math-match-substring line 1))
             (math-read-big-emptyp math-rb-h1 math-rb-v1 h v nil t)
             (math-read-big-emptyp math-rb-h1 (1+ v) h math-rb-v2 nil t)
             (if (= (math-read-big-char widest v) ?\()
                 (progn
                   (setq line (if (string-match "-" p)
                                  (intern p)
                                (intern (concat "calcFunc-" p)))
                         h (1+ widest)
                         p nil)
                   (math-read-big-emptyp widest math-rb-v1 h v nil t)
                   (math-read-big-emptyp widest (1+ v) h math-rb-v2 nil t)
                   (while (progn
                            (setq widest (math-read-big-balance h v "(" t))
                            (math-read-big-emptyp (1- h) math-rb-v1 h v nil t)
                            (math-read-big-emptyp (1- h) (1+ v) h math-rb-v2 nil t)
                            (setq p (cons (math-read-big-rec
                                           h math-rb-v1 (1- widest) math-rb-v2 v) p)
                                  h widest)
                            (= (math-read-big-char (1- h) v) ?\,)))
                   (or (= (math-read-big-char (1- h) v) ?\))
                       (math-read-big-error (1- h) v "Expected `)'"))
                   (setq p (cons line (nreverse p))))
               (setq p (list 'var
                             (intern (math-remove-dashes p))
                             (if (string-match "-" p)
                                 (intern p)
                               (intern (concat "var-" p)))))))

            ;; Number.
            (t
             (setq line (nth v math-read-big-lines))
             (or (= (string-match "_?\\([0-9]+.?0*@ *\\)?\\([0-9]+.?0*' *\\)?\\([0-9]+\\(#\\|\\^\\^\\)[0-9a-zA-Z:]+\\|[0-9]+:[0-9:]+\\|[0-9.]+\\([eE][-+_]?[0-9]+\\)?\"?\\)?" line math-rb-h1) math-rb-h1)
                 (math-read-big-error h v "Expected a number"))
             (setq h (match-end 0)
                   p (math-read-number (math-match-substring line 0)))
             (math-read-big-emptyp math-rb-h1 math-rb-v1 h v nil t)
             (math-read-big-emptyp math-rb-h1 (1+ v) h math-rb-v2 nil t)))

      ;; Now left term is bounded by math-rb-h1, math-rb-v1, h, math-rb-v2; 
      ;; baseline = v.
      (if baseline
          (or (= v baseline)
              (math-read-big-error math-rb-h1 v "Inconsistent baseline in formula"))
        (setq baseline v))

      ;; Look for superscripts or subscripts.
      (setq line (nth baseline math-read-big-lines)
            len (min math-rb-h2 (length line))
            widest h)
      (while (and (< widest len)
                  (= (aref line widest) ?\ ))
        (setq widest (1+ widest)))
      (and (>= widest len) (setq widest math-rb-h2))
      (if (math-read-big-emptyp h v widest math-rb-v2)
          (if (math-read-big-emptyp h math-rb-v1 widest v)
              (setq h widest)
            (setq p (list '^ p (math-read-big-rec h math-rb-v1 widest v))
                  h widest))
          (if (math-read-big-emptyp h math-rb-v1 widest v)
              (setq p (list 'calcFunc-subscr p
                            (math-read-big-rec h v widest math-rb-v2))
                    h widest)))

      ;; Look for an operator name and grab additional terms.
      (while (and (< h len)
                  (if (setq widest (and (math-read-big-emptyp
                                         h math-rb-v1 (1+ h) v)
                                        (math-read-big-emptyp
                                         h (1+ v) (1+ h) math-rb-v2)
                                        (string-match "<=\\|>=\\|\\+/-\\|!=\\|&&\\|||\\|:=\\|=>\\|." line h)
                                        (assoc (math-match-substring line 0)
                                               math-standard-opers)))
                      (and (>= (nth 2 widest) prec)
                           (setq h (match-end 0)))
                    (and (not (eq (string-match ",\\|;\\|\\.\\.\\|)\\|\\]\\|:" line h)
                                  h))
                         (setq widest '("2x" * 196 195)))))
        (cond ((eq (nth 3 widest) -1)
               (setq p (list (nth 1 widest) p)))
              ((equal (car widest) "?")
               (let ((y (math-read-big-rec h math-rb-v1 math-rb-h2 
                                           math-rb-v2 baseline nil t)))
                 (or (= (math-read-big-char math-read-big-h2 baseline) ?\:)
                     (math-read-big-error math-read-big-h2 baseline "Expected `:'"))
                 (setq p (list (nth 1 widest) p y
                               (math-read-big-rec 
                                (1+ math-read-big-h2) math-rb-v1 math-rb-h2 math-rb-v2
                                baseline (nth 3 widest) t))
                       h math-read-big-h2)))
              (t
               (setq p (list (nth 1 widest) p
                             (math-read-big-rec h math-rb-v1 math-rb-h2 math-rb-v2
                                                baseline (nth 3 widest) t))
                     h math-read-big-h2))))

      ;; Return all relevant information to caller.
      (setq math-read-big-baseline baseline
            math-read-big-h2 h)
      (or short (= math-read-big-h2 math-rb-h2)
          (math-read-big-error h baseline))
      p)))

(defun math-read-big-char (h v)
  (or (and (>= h math-rb-h1)
           (< h math-rb-h2)
           (>= v math-rb-v1)
           (< v math-rb-v2)
           (let ((line (nth v math-read-big-lines)))
             (and line
                  (< h (length line))
                  (aref line h))))
      ?\ ))

(defun math-read-big-emptyp (eh1 ev1 eh2 ev2 &optional what error)
  (and (< ev1 math-rb-v1) (setq ev1 math-rb-v1))
  (and (< eh1 math-rb-h1) (setq eh1 math-rb-h1))
  (and (> ev2 math-rb-v2) (setq ev2 math-rb-v2))
  (and (> eh2 math-rb-h2) (setq eh2 math-rb-h2))
  (or what (setq what ?\ ))
  (let ((p (nthcdr ev1 math-read-big-lines))
        h)
    (while (and (< ev1 ev2)
                (progn
                  (setq h (min eh2 (length (car p))))
                  (while (and (>= (setq h (1- h)) eh1)
                              (= (aref (car p) h) what)))
                  (and error (>= h eh1)
                       (math-read-big-error h ev1 (if (stringp error)
                                                      error
                                                    "Whitespace expected")))
                  (< h eh1)))
      (setq ev1 (1+ ev1)
            p (cdr p)))
    (>= ev1 ev2)))

;; math-read-big-err-msg is local to math-read-big-expr in calc-ext.el,
;; but is used by math-read-big-error which is called (indirectly) by
;; math-read-big-expr.
(defvar math-read-big-err-msg)

(defun math-read-big-error (h v &optional msg)
  (let ((pos 0)
        (p math-read-big-lines))
    (while (> v 0)
      (setq pos (+ pos 1 (length (car p)))
            p (cdr p)
            v (1- v)))
    (setq h (+ pos (min h (length (car p))))
          math-read-big-err-msg (list 'error h (or msg "Syntax error")))
    (throw 'syntax nil)))

(defun math-read-big-balance (h v what &optional commas)
  (let* ((line (nth v math-read-big-lines))
         (len (min math-rb-h2 (length line)))
         (count 1))
    (while (> count 0)
      (if (>= h len)
          (if what
              (math-read-big-error nil v (format "Unmatched `%s'" what))
            (setq count 0))
        (if (memq (aref line h) '(?\( ?\[))
            (setq count (1+ count))
          (if (if (and commas (= count 1))
                  (or (memq (aref line h) '(?\) ?\] ?\, ?\;))
                      (and (eq (aref line h) ?\.)
                           (< (1+ h) len)
                           (eq (aref line (1+ h)) ?\.)))
                (memq (aref line h) '(?\) ?\])))
              (setq count (1- count))))
        (setq h (1+ h))))
    h))

;;; arch-tag: 483bfe15-f290-4fef-bb7d-ce65be687f2e
;;; calc-lang.el ends here