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  1. object Main extends App {
  2.  
  3.   type MapFunc[T] = String => Option[T]
  4.  
  5.   trait HttpMethod
  6.   case object GET extends HttpMethod
  7.   case object POST extends HttpMethod
  8.  
  9.   def httpMethod: MapFunc[HttpMethod] = {
  10.     case "GET" => Some(GET)
  11.     case "POST" => Some(POST)
  12.     case _ => None
  13.   }
  14.  
  15.   def string: MapFunc[String] = (v: String) => Some(v)
  16.  
  17.   def bool: MapFunc[Boolean] = {
  18.     case "1" => Some(true)
  19.     case "0" => Some(false)
  20.     case _ => None
  21.   }
  22.  
  23.   implicit class FuncTuple3[F,T1,T2,T3](tup: (F => T1,F => T2,F => T3)) {
  24.     def mapList(vs: List[F]) = {
  25.       vs match {
  26.         case List(v1,v2,v3) => Some(tup._1(v1),tup._2(v2),tup._3(v3))
  27.         case _ => None
  28.       }
  29.     }
  30.   }
  31.  
  32.   case class Request(method: HttpMethod, keepAlive: Boolean, url: String)
  33.  
  34.  
  35.   println {
  36.     (httpMethod, bool, string).mapList(List("GET", "1", "http://2...content-available-to-author-only...h.hk")) map {
  37.       case (method, Some(keepAlive), Some(url)) =>Request(method getOrElse GET, keepAlive, url)
  38.       case _ => None
  39.     }
  40.   }
  41.  
  42.  
  43. }
Success #stdin #stdout 0.4s 382080KB
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Standard input is empty
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Some(Request(GET,true,http://2...content-available-to-author-only...h.hk))
https://ideone.com/dYs4vx
language:
Scala (scala 2.12.8)
created:
9 years ago
visibility:
secret

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