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(in-package #:json)
(defparameter number-parser
(let ((signed-digits
(comp ((sign (zero-or-one (unit (lambda (x) (or (char= x #\-)
(char= x #\+))))))
(natural (one-or-more (unit #'digit-char-p))))
(cons sign natural))))
(comp ((base (either signed-digits
(fail "Malformed number.")))
(dot (zero-or-one (unit (lambda (x) (char= x #\.)))))
(fraction (if dot
(either (one-or-more (unit #'digit-char-p))
(fail "Malformed fractional part."))
nothing))
(e (zero-or-one (unit (lambda (x) (or (char= x #\e)
(char= x #\E))))))
(exponent (if e
(either signed-digits
(fail "Malformed exponent part."))
nothing)))
(list 'number base fraction exponent))))
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