public bool IsCardinalityValid()

in sdk/Sdk.Generators/FunctionMetadataProviderGenerator/FunctionMetadataProviderGenerator.CardinalityParser.cs [66:155]
71 lines of code
21 McCabe index (conditional complexity)

            public bool IsCardinalityValid(IParameterSymbol parameterSymbol, AttributeData attribute, out DataType dataType)
            {
                dataType = DataType.Undefined;
                var cardinalityIsNamedArg = false;

                // check if IsBatched is defined in the NamedArguments
                foreach (var arg in attribute.NamedArguments)
                {
                    if (String.Equals(arg.Key, Constants.FunctionMetadataBindingProps.IsBatchedKey) &&
                        arg.Value.Value != null)
                    {
                        cardinalityIsNamedArg = true;
                        var isBatched = (bool)arg.Value.Value; // isBatched takes in booleans so we can just type cast it here to use

                        if (!isBatched)
                        {
                            dataType = _dataTypeParser.GetDataType(parameterSymbol.Type);
                            return true;
                        }
                    }
                }

                // When "IsBatched" is not a named arg, we have to check the default value
                if (!cardinalityIsNamedArg)
                {
                    if (!TryGetIsBatchedProp(attribute, out var isBatchedProp))
                    {
                        dataType = DataType.Undefined;
                        return false;
                    }

                    var defaultValAttr = isBatchedProp!
                        .GetAttributes()
                        .SingleOrDefault(attr => SymbolEqualityComparer.Default.Equals(attr.AttributeClass, _knownFunctionMetadataTypes.DefaultValue));

                    var defaultVal = defaultValAttr!.ConstructorArguments.SingleOrDefault().Value!.ToString(); // there is only one constructor arg for the DefaultValue attribute (the default value)

                    if (!bool.TryParse(defaultVal, out bool b) || !b)
                    {
                        dataType = _dataTypeParser.GetDataType(parameterSymbol.Type);
                        return true;
                    }
                }

                // we check if the param is an array type
                // we exclude byte arrays (byte[]) b/c we handle that as Cardinality.One (we handle this similar to how a char[] is basically a string)
                if (parameterSymbol.Type is IArrayTypeSymbol && !SymbolEqualityComparer.Default.Equals(parameterSymbol.Type, _knownTypes.ByteArray))
                {
                    dataType = _dataTypeParser.GetDataType(parameterSymbol.Type);
                    return true;
                }

                // Check if mapping type - mapping enumerables are not valid types for Cardinality.Many
                if (parameterSymbol.Type.IsOrImplementsOrDerivesFrom(_knownTypes.IEnumerableOfKeyValuePair)
                    || parameterSymbol.Type.IsOrImplementsOrDerivesFrom(_knownTypes.LookupGeneric)
                    || parameterSymbol.Type.IsOrImplementsOrDerivesFrom(_knownTypes.DictionaryGeneric))
                {
                    return false;
                }

                var isGenericEnumerable = parameterSymbol.Type.IsOrImplementsOrDerivesFrom(_knownTypes.IEnumerableGeneric);
                var isEnumerable = parameterSymbol.Type.IsOrImplementsOrDerivesFrom(_knownTypes.IEnumerable);

                if (!_dataTypeParser.IsStringType(parameterSymbol.Type) && (isGenericEnumerable || isEnumerable))
                {
                    if (_dataTypeParser.IsStringType(parameterSymbol.Type))
                    {
                        dataType = DataType.String;
                    }
                    else if (_dataTypeParser.IsBinaryType(parameterSymbol.Type))
                    {
                        dataType = DataType.Binary;
                    }
                    else if (isGenericEnumerable)
                    {
                        dataType = ResolveIEnumerableOfT(parameterSymbol, out bool hasError);

                        if (hasError)
                        {
                            return false;
                        }

                        return true;
                    }
                    return true;
                }

                // trigger input type doesn't match any of the valid cases so return false
                return false;
            }