static string RuntimeStartLength()

in edge-hub/core/src/Microsoft.Azure.Devices.Routing.Core/query/builtins/Substring.cs [54:70]

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

        static string RuntimeStartLength(QueryValue input, QueryValue start, QueryValue length)
        {
            if (input?.ValueType != QueryValueType.String || start?.ValueType != QueryValueType.Double || length?.ValueType != QueryValueType.Double)
            {
                return Undefined.Instance;
            }

            string inputString = (string)input.Value;
            double startIndex = (double)start.Value;
            double lengthValue = (double)length.Value;

            bool isValid = !inputString.IsNullOrUndefined() &&
                startIndex.IsDefined() && startIndex < inputString.Length && startIndex >= 0 &&
                lengthValue.IsDefined() && lengthValue >= 0 && lengthValue <= (inputString.Length - startIndex);

            return isValid ? inputString.Substring((int)startIndex, (int)lengthValue) : Undefined.Instance;
        }