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(in-package #:json)
(defparameter number-literal
(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 signed-digits)
(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)))
(read-from-string
(str:from-list
(remove nil (append base (cons dot fraction) (cons e exponent))))))))
(defparameter string-literal
(comp ((_ (unit (lambda (x) (char= x #\"))))
(chars (zero-or-more (either (comp ((slash (unit (lambda (x) (char= x #\\))))
(escaped (unit))
(codepoints (if (and escaped (char= escaped #\u))
(comp ((cp0 (unit #'digit-char-p))
(cp1 (unit #'digit-char-p))
(cp2 (unit #'digit-char-p))
(cp3 (unit #'digit-char-p)))
(let ((str (make-string 7)))
(setf (char str 0) #\#)
(setf (char str 1) #\\)
(setf (char str 2) #\u)
(setf (char str 3) cp0)
(setf (char str 4) cp1)
(setf (char str 5) cp2)
(setf (char str 6) cp3)
str))
nothing)))
(case escaped
(#\n
#\Newline)
(#\t
#\Tab)
(#\u
(read-from-string codepoints))
(t escaped)))
(unit (lambda (x) (and (char/= x #\")
(char/= x #\\)))))))
(_ (either (unit (lambda (x) (char= x #\")))
(fail "String is not properly closed."))))
(str:from-list chars)))
(defparameter whitespace
(comp ((_ (zero-or-more (unit (lambda (x) (or (char= x #\Space)
(char= x #\Newline)
(char= x #\Tab)))))))
nil))
(defparameter true-symbol
(comp ((_ (unit (lambda (x) (char= x #\t))))
(_ (unit (lambda (x) (char= x #\r))))
(_ (unit (lambda (x) (char= x #\u))))
(_ (unit (lambda (x) (char= x #\e)))))
'true))
(defparameter false-symbol
(comp ((_ (unit (lambda (x) (char= x #\f))))
(_ (unit (lambda (x) (char= x #\a))))
(_ (unit (lambda (x) (char= x #\l))))
(_ (unit (lambda (x) (char= x #\s))))
(_ (unit (lambda (x) (char= x #\e)))))
'false))
(defparameter null-symbol
(comp ((_ (unit (lambda (x) (char= x #\n))))
(_ (unit (lambda (x) (char= x #\u))))
(_ (unit (lambda (x) (char= x #\l))))
(_ (unit (lambda (x) (char= x #\l)))))
'null))
(defvar json-value)
(defun separated-list (value-type separator)
(comp ((v value-type)
(sep (zero-or-one (unit (lambda (x) (char= separator x)))))
(vn (if sep
(either (separated-list value-type separator)
(fail "Expected another value."))
nothing)))
(cons v vn)))
(defparameter json-array
(comp ((_ (unit (lambda (x) (char= x #\[))))
(vn (zero-or-one (separated-list json-value #\,)))
(_ (unit (lambda (x) (char= x #\])))))
(apply #'vector vn)))
(defparameter json-object
(let ((json-pair
(comp ((_ whitespace)
(k (either string-literal
(fail "Expected a string.")))
(_ whitespace)
(_ (either (unit (lambda (x) (char= x #\:)))
(fail "Expected a \":\"")))
(v json-value))
(cons k v))))
(comp ((_ (unit (lambda (x) (char= x #\{))))
(vn (zero-or-one (separated-list json-pair #\,)))
(_ (unit (lambda (x) (char= x #\})))))
(let* ((vlist vn)
(obj (make-hash-table :test #'equal :size (length vlist))))
(dolist (v vlist)
(setf (gethash (car v) obj) (cdr v)))
obj))))
(setf json-value
(comp ((_ whitespace)
(v (either number-literal
string-literal
json-object
json-array
true-symbol
false-symbol
null-symbol))
(_ whitespace))
v))
(defun parse-string (str)
(run json-value (input:from-string str)))
(defun parse-file (file)
(run json-value (input:from-file file)))
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