public decimal Evaluate(BasicMathExpression expression)
{
Clear();
//left
if (expression.Left.StartsWith("-") || expression.Left.StartsWith("m"))
{
EnterNumber(expression.Left.Substring(1));
Negate();
}
else
{
EnterNumber(expression.Left);
}
//operation
EnterOperation(expression.Operation);
//reght
if (expression.Right.StartsWith("-") || expression.Right.StartsWith("m"))
{
EnterNumber(expression.Right.Substring(1));
Negate();
}
else
{
EnterNumber(expression.Right);
}
RunEvaluate();
var res = GetResultingValue();
return(res);
}
public void ExpressionParseBasic(string exprString, decimal left, decimal right, string operationSign)
{
var expr = new BasicMathExpression(exprString);
expr.OriginalExpression.Should().Be(exprString, $"expression should be {exprString}");
expr.Left.Should().Be(left.ToString(CultureInfo.InvariantCulture), $"left should be {left}");
expr.LeftValue.Should().Be(left, $"left value should be {left}");
expr.Right.Should().Be(right.ToString(CultureInfo.InvariantCulture), $"right should be {right}");
expr.RightValue.Should().Be(right, $"right value should be {right}");
expr.Operation.Sign.Should().Be(operationSign, $"operation should be {operationSign}");
}
public decimal Evaluate(BasicMathExpression expression)
{
if (expression.Operation.Equals(SupportedOperations.Plus))
{
return(expression.LeftValue + expression.RightValue);
}
if (expression.Operation.Equals(SupportedOperations.Minus))
{
return(expression.LeftValue - expression.RightValue);
}
if (expression.Operation.Equals(SupportedOperations.Multiply))
{
return(expression.LeftValue * expression.RightValue);
}
if (expression.Operation.Equals(SupportedOperations.Divide))
{
return(expression.LeftValue / expression.RightValue);
}
throw new NotSupportedException($"The operation '{expression.Operation.Sign}' is not supported");
}
private string EvaluateBasicExpressionAndReplace(string expression, Match m)
{
var simpleExpression = new BasicMathExpression(m.Groups[0].ToString());
return($"{expression.Substring(0, m.Groups[0].Index)}{_expressionEvaluator.Evaluate(simpleExpression)}{expression.Substring(m.Groups[0].Index + m.Groups[0].Length)}");
}