def parse()

in util-core/src/main/scala/com/twitter/util/Duration.scala [232:266]

• 28 lines of code
• 14 McCabe index (conditional complexity)

  def parse(s: String): Duration = {
    val ss = s.toLowerCase
    ss match {
      case FullDurationRegex(_*) =>
        SingleDurationRegex.findAllIn(ss).matchData.zipWithIndex map {
          case (m, i) =>
            val List(signStr, numStr, unitStr, special) = m.subgroups
            val absDuration = special match {
              case "top" => Top
              case "bottom" => Bottom
              case "undefined" => Undefined
              case _ =>
                val u = nameToUnit.get(unitStr) match {
                  case Some(t) => t
                  case None => throw new NumberFormatException("Invalid unit: " + unitStr)
                }
                Duration(numStr.toLong, u)
            }

            signStr match {
              case "-" => -absDuration

              // It's only OK to omit the sign for the first duration.
              case "" if i > 0 =>
                throw new NumberFormatException("Expected a sign between durations")

              case _ => absDuration
            }

          // It's OK to use reduce because the regex ensures that there is
          // at least one element
        } reduce { _ + _ }
      case _ => throw new NumberFormatException("Invalid duration: " + s)
    }
  }