public static IExpression CreateFromExpression(string expression)
{
IExpression result = null;
if (ConstantExpression.IsMatch(expression))
{
result = new ConstantExpression();
}
else if (AddExpression.IsMatch(expression))
{
result = new AddExpression();
}
else if (SubExpression.IsMatch(expression))
{
result = new SubExpression();
}
else if (MulExpression.IsMatch(expression))
{
result = new MulExpression();
}
else if (DivExpression.IsMatch(expression))
{
result = new DivExpression();
}
else if (LetExpression.IsMatch(expression))
{
result = new LetExpression();
}
else if (VariableExpression.IsMatch(expression))
{
result = new VariableExpression();
}
return(result);
}
public void IsMatchTests(string expression, bool expectedResult)
{
bool result = DivExpression.IsMatch(expression);
Assert.That(result, Is.EqualTo(expectedResult));
}