def decodeValue()

in scripts/src/main/scala/com/gu/mediaservice/lib/JsonValueCodecJsValue.scala [17:72]
49 lines of code
19 McCabe index (conditional complexity)

      def decodeValue(in: JsonReader, default: JsValue): JsValue = {
        val b = in.nextToken()
        if (b == 'n') in.readNullOrError(default, "expected `null` value")
        else if (b == '"') {
          in.rollbackToken()
          JsString(in.readString(null))
        } else if (b == 'f' || b == 't') {
          in.rollbackToken()
          if (in.readBoolean()) JsTrue else JsFalse
        } else if ((b >= '0' && b <= '9') || b == '-') {
          in.rollbackToken()
          val bigDecimal = in.readBigDecimal(null)
          JsNumber(bigDecimal)
        } else if (b == '[') {
          val array: IndexedSeq[JsValue] =
            if (in.isNextToken(']')) new Array[JsValue](0)
            else {
              in.rollbackToken()
              var i = 0
              var arr = new Array[JsValue](4)
              do {
                if (i == arr.length) arr = java.util.Arrays.copyOf(arr, i << 1)
                arr(i) = decodeValue(in, default)
                i += 1
              } while (in.isNextToken(','))

              if (in.isCurrentToken(']'))
                if (i == arr.length) arr else java.util.Arrays.copyOf(arr, i)
              else in.arrayEndOrCommaError()
            }
          JsArray(array)
        } else if (b == '{') {
          /*
           * Because of DoS vulnerability in Scala 2.12 HashMap https://github.com/scala/bug/issues/11203
           * we use a Java LinkedHashMap because it better handles hash code collisions for Comparable keys.
           */
          val kvs =
            if (in.isNextToken('}')) new java.util.LinkedHashMap[String, JsValue]()
            else {
              val underlying = new java.util.LinkedHashMap[String, JsValue]()
              in.rollbackToken()
              do {
                underlying.put(in.readKeyAsString(), decodeValue(in, default))
              } while (in.isNextToken(','))

              if (!in.isCurrentToken('}'))
                in.objectEndOrCommaError()

              underlying
            }
          import scala.jdk.CollectionConverters._
          JsObject(kvs.asScala)
        } else {
          in.decodeError("expected JSON value")
        }
      }