Microsoft.R.Core.AST.Operators.FunctionCall.GetParameterName C# (CSharp) Method

        public string GetParameterName(int index, out bool namedParameter) {
            namedParameter = false;
            if (index < 0 || index > Arguments.Count - 1) {
                return string.Empty;
            }

            CommaSeparatedItem arg = Arguments[index];
            if (arg is NamedArgument) {
                namedParameter = true;
                return ((NamedArgument)arg).Name;
            } else if (arg is ExpressionArgument) {
                IExpression exp = ((ExpressionArgument)arg).ArgumentValue;
                if (exp.Children.Count == 1 && exp.Children[0] is Variable) {
                    return ((Variable)exp.Children[0]).Name;
                }
            }

            return string.Empty;
        }