?start: value

?value: object
      | array
      | string
      | SIGNED_NUMBER      -> number
      | "true"             -> true
      | "false"            -> false
      | "null"             -> null

array  : "[" _WS? [value ("," _WS? value)*] "]"
object : "{" _WS? [pair ("," _WS? pair)*] "}"
pair   : string ":" _WS value

string : ESCAPED_STRING

%import common.ESCAPED_STRING
%import common.SIGNED_NUMBER
%import common.WS -> _WS