def parseOptionString()

in kyuubi-util-scala/src/main/scala/org/apache/kyuubi/util/command/CommandLineUtils.scala [85:160]
74 lines of code
22 McCabe index (conditional complexity)

  def parseOptionString(s: String): List[String] = {
    val opts = ListBuffer[String]()
    val opt = new StringBuilder()
    var inOpt = false
    var inSingleQuote = false
    var inDoubleQuote = false
    var escapeNext = false
    var hasData = false

    var i = 0
    while (i < s.length) {
      val c = s.codePointAt(i)
      if (escapeNext) {
        opt.appendAll(Character.toChars(c))
        escapeNext = false
      } else if (inOpt) {
        c match {
          case '\\' =>
            if (inSingleQuote) {
              opt.appendAll(Character.toChars(c))
            } else {
              escapeNext = true
            }
          case '\'' =>
            if (inDoubleQuote) {
              opt.appendAll(Character.toChars(c))
            } else {
              inSingleQuote = !inSingleQuote
            }
          case '"' =>
            if (inSingleQuote) {
              opt.appendAll(Character.toChars(c))
            } else {
              inDoubleQuote = !inDoubleQuote
            }
          case _ =>
            if (!Character.isWhitespace(c) || inSingleQuote || inDoubleQuote) {
              opt.appendAll(Character.toChars(c))
            } else {
              opts += opt.toString()
              opt.setLength(0)
              inOpt = false
              hasData = false
            }
        }
      } else {
        c match {
          case '\'' =>
            inSingleQuote = true
            inOpt = true
            hasData = true
          case '"' =>
            inDoubleQuote = true
            inOpt = true
            hasData = true
          case '\\' =>
            escapeNext = true
            inOpt = true
            hasData = true
          case _ =>
            if (!Character.isWhitespace(c)) {
              inOpt = true
              hasData = true
              opt.appendAll(Character.toChars(c))
            }
        }
      }
      i += Character.charCount(c)
    }

    require(!inSingleQuote && !inDoubleQuote && !escapeNext, s"Invalid option string: $s")
    if (hasData) {
      opts += opt.toString()
    }
    opts.toList
  }