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(defpackage :parzival-numbers
(:use :cl :parzival))
(in-package :parzival-numbers)
(defun <<map-to (parser value)
(<<map (lambda (x) value) parser))
(<<def <ones<
(<<or (<<map-to (<<string "one") 1)
(<<map-to (<<string "two") 2)
(<<map-to (<<string "three") 3)
(<<map-to (<<string "four") 4)
(<<map-to (<<string "five") 5)
(<<map-to (<<string "six") 6)
(<<map-to (<<string "seven") 7)
(<<map-to (<<string "eight") 8)
(<<map-to (<<string "nine") 9)))
(<<def <teens<
(<<or (<<map-to (<<string "ten") 10)
(<<map-to (<<string "eleven") 11)
(<<map-to (<<string "twelve") 12)
(<<map-to (<<string "thirteen") 13)
(<<map-to (<<string "fourteen") 14)
(<<map-to (<<string "fifteen") 15)
(<<map-to (<<string "sixteen") 16)
(<<map-to (<<string "seventeen") 17)
(<<map-to (<<string "eighteen") 18)
(<<map-to (<<string "nineteen") 19)))
(<<def <tens<
(<<or (<<map-to (<<string "twenty") 20)
(<<map-to (<<string "thirty") 30)
(<<map-to (<<string "forty") 40)
(<<map-to (<<string "fifty") 50)
(<<map-to (<<string "sixty") 60)
(<<map-to (<<string "seventy") 70)
(<<map-to (<<string "eighty") 80)
(<<map-to (<<string "ninety") 90)))
(<<def <20-to-99<
(<<bind <tens<
(lambda (tens)
(<<map (lambda (ones) (+ tens ones))
(<<and (<<char #\-) <ones<)))))
(<<def <1-to-99<
(<<or <20-to-99< <tens< <teens< <ones<))
(<<def <one-hundreds<
(<<bind <ones<
(lambda (num)
(<<map (lambda (ignore) (* num 100))
(<<and (<<+ <space<) (<<string "hundred"))))))
(<<def <in-hundreds<
(<<bind <one-hundreds<
(lambda (hundreds)
(<<map (lambda (num) (+ hundreds num))
(<<and (<<+ <space<) <1-to-99<)))))
(<<def <all-hundreds<
(<<plus <in-hundreds< <one-hundreds<))
(defun <<magnitude-order (name factor)
(<<bind (<<or <all-hundreds< <1-to-99<)
(lambda (val)
(<<map (lambda (ignore) (* val factor))
(<<and (<<+ <space<) (<<string name))))))
(<<def <thousands< (<<magnitude-order "thousand" 1000))
(<<def <millions< (<<magnitude-order "million" 1000000))
(<<def <billions< (<<magnitude-order "billion" 1000000000))
(<<def <trillions< (<<magnitude-order "trillion" 1000000000000))
(<<def <quadrillions< (<<magnitude-order "quadrillion" 1000000000000000))
(<<def <number<
(<<map (lambda (ls) (apply #'+ ls))
(apply #'parzival::<<list
(mapcar (lambda (p) (<<or (<<strip p) (<<result 0)))
(list <quadrillions< <trillions< <billions<
<millions< <thousands<
<all-hundreds< <1-to-99<)))))
(defun parse-number (str)
(parse str <number< t))
;; three plus forty-seven thousand plus two hundred million sixty-five
(<<def <op< (<<strip (<<or (<<string "plus")
(<<string "minus")
(<<string "times")
(<<string "over"))))
(<<def <calc<
(<<plus
(<<bind <number<
(lambda (number)
(<<map (lambda (op-calc)
(cond ((equal (car op-calc) "plus")
(+ number (cdr op-calc)))
((equal (car op-calc) "minus")
(- number (cdr op-calc)))
((equal (car op-calc) "times")
(* number (cdr op-calc)))
((equal (car op-calc) "over")
(round (/ number (cdr op-calc))))))
(<<cons <op< #'<calc<))))
<number<))
(defun natural-language-calc ()
(format t "Hello! And Welcome To the Super Practical Natural Language Calculator!~%~%")
(format t "Type quit to quit~%")
(format t "> ")
(loop named goof-calc
for line = (read-line)
do
(if (equal line "quit")
(return-from goof-calc "OK")
(let ((parsed (parse (string-downcase line) <calc< t)))
(if parsed
(format t "EQUALS ~R~%> " parsed)
(format t "No no no.. all wrong...~%> "))))))
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