public static string Evaluate(IEnumerable <Token> expression)
{
var stack = new Stack <Token>();
foreach (var token in expression)
{
if (token.Type == TokenType.Variable)
{
stack.Push(token);
}
var ft = new FormatTranslator();
if (token.Type != TokenType.Operator)
{
continue;
}
{
var op2 = stack.Pop().ToString();
string smallRes;
if (token.Value == "!")
{
smallRes = BaseMath.DoMath(ft.Factory(op2), token.Value);
}
else
{
var op1 = stack.Pop().ToString();
smallRes = BaseMath.DoMath(ft.Factory(op1), ft.Factory(op2), token.Value);
}
var v = new Token(TokenType.Variable, smallRes);
stack.Push(v);
}
}
return(stack.Pop().ToString());
}
public void TwoIntSum()
{
var ft = new FormatTranslator();
var a = "2";
var b = "2";
Assert.AreEqual("4", BaseMath.DoMath(ft.Factory(a), ft.Factory(b), "+"));
}
public void SubstractDoubleFromString()
{
var ft = new FormatTranslator();
try
{
var rr = BaseMath.DoMath(ft.Factory("4"), ft.Factory("4.4"), "*");
Debug.WriteLine($"4*4.4={rr}");
}
catch (InvalidOperationException ex)
{
Assert.AreEqual(ex.Message, "Operator '-' cannot be applied to operands of type 'System.String' and 'System.Double'.");
}
try
{
BaseMath.DoMath(ft.Factory("asd"), ft.Factory("asd"), "*");
}
catch (InvalidOperationException ex)
{
Debug.WriteLine(ex.Message);
Assert.AreEqual(ex.Message, "Operator '*' cannot be applied to operands of type 'System.String' and 'System.String'.");
}
}
