private static void EvaluateInput(string input,out string output)
{
input = input.Trim();
//
// Use Regex to identify the input type and split into tokens.
//
var intOpRegex = @"^\d+\s*(\+|\-|\*|\/)\s*\d+$";
var binOpRegex = @"^b[01]+\s*(\+|\-|\*|\/)\s*b[01]+$";
var strOpRegex = @"^[A-Za-z0-9]+\s*(\+|\-|\*|\/)\s*[A-Za-z0-9]+$";
string[] tokens = Regex.Split(input, @"(\+|\-|\*|\/)");
if (Regex.IsMatch(input, intOpRegex))
{
ICalculator<int> intCalc = new IntegerCalculator();
output = intCalc.eval(tokens[0], tokens[1], tokens[2].TrimStart()).ToString();
}
else if (Regex.IsMatch(input, binOpRegex))
{
ICalculator<Binary> binCalc = new BinaryCalculator();
output = binCalc.eval(tokens[0].Substring(1, tokens[0].Length - 1).TrimEnd(), tokens[1], tokens[2].TrimStart().Substring(1)).ToString();
}
else if(Regex.IsMatch(input,strOpRegex))
{
ICalculator<string> strCalc = new StringCalculator();
output = strCalc.eval(tokens[0].TrimEnd(), tokens[1], tokens[2].TrimStart());
}
else
{
output = "Operation cannot be performed.";
}
}
public void TestAdd(string input, int expected)
{
// Arrange
var calc = new StringCalculator();
// Act
var actual = calc.Add(input);
// Assert
Assert.AreEqual(expected, actual);
}
public static void ShouldEqual(this string input, int expected)
{
var cal = new StringCalculator();
Assert.Equal(expected, cal.Add(input));
}
public void NegativeNumberThrowsException(string input, string expectMessage)
{
// Arrange
var calc = new StringCalculator();
try
{
// Act
calc.Add(input);
}
catch (Exception ex)
{
// Assert
Assert.AreEqual(ex.Message, expectMessage);
return;
}
Assert.Fail("Exception should be thrown");
}
public void GivenIHaveACalculator()
{
calculator = new StringCalculator();
}