Calculator parser and NameParser2

NameParser2.scala

object NameParser2 extends RegexParsers {
    case class Name(first: String, last: String)
    def name:Parser[String] = "[a-zA-Z]+".r
    def fullName = rep(name) ^^ { names =>
      Name(names.head, names(1))
    }
    def parse(input: String) = parseAll(fullName, input) match {
      case Success(result, _) =>
        result
      case failure : NoSuccess => scala.sys.error(failure.msg)
    }
  }
  val res2 = NameParser2.parse("Martin Martin Odersky")
  
  
  
  /////
  
   object Calculator extends RegexParsers {
    def number: Parser[Double] = """\d+(\.\d*)?""".r ^^ { _.toDouble }
    def factor: Parser[Double] = number | "(" ~> expr <~ ")"
    def term  : Parser[Double] = factor ~ rep( "*" ~ factor | "/" ~ factor) ^^ {
      case number ~ list => (number /: list) {
        case (x, "*" ~ y) => x * y
        case (x, "/" ~ y) => x / y
      }
    }
    def expr  : Parser[Double] = term ~ rep("+" ~ log(term)("Plus term") | "-" ~ log(term)("Minus term")) ^^ {
      case number ~ list => list.foldLeft(number) { // same as before, using alternate name for /:
        case (x, "+" ~ y) => x + y
        case (x, "-" ~ y) => x - y
      }
    }

    def apply(input: String): Double = parseAll(expr, input) match {
      case Success(result, _) => result
      case failure : NoSuccess => scala.sys.error(failure.msg)
    }

  }