使用Scala Parser解析JSON

原博客地址：使用Scala Parser解析JSON

import scala.util.parsing.combinator._

class JsonParser extends JavaTokenParsers {
	def jNum: Parser[Double] = floatingPointNumber ^^ (_.toDouble)
	def jStr: Parser[String] = stringLiteral ^^ (s => s.substring(1, s.length() - 1))
	def jBool: Parser[Boolean] = "(true|false)".r ^^ (_.toBoolean)
	def jNull: Parser[Null] = "null".r ^^ (t => null)
	def term = jsonArray | jsonObject | jNum | jBool | jNull | jStr
	def jsonArray: Parser[List[Any]] = "[" ~> rep(term <~ ",?".r) <~ "]" ^^ (l => l)
	def jsonObject: Parser[Map[String, Any]] = "{" ~> rep((
		ident ~ ":" ~ jNum |
		ident ~ ":" ~ jBool |
		ident ~ ":" ~ jNull |
		ident ~ ":" ~ jsonObject |
		ident ~ ":" ~ jsonArray |
		ident ~ ":" ~ jStr) <~ ",?".r
	) <~ "}" ^^ {
		os =>
			var map = Map[String, Any]()
			os.foreach(o =>
				o match {
					case k ~ ":" ~ v => map = map ++ Map(k -> v)
				}
			)
			map
	}
}

object JsonParser_Ex extends JsonParser with App{
	val result = parseAll(jsonObject, """{a:[1,2,"a",{name:"cc"}],b:1,c:"cc",d:null,e:true}""")
	println(result)
}