public override Double Compute()
{
if (String.IsNullOrWhiteSpace(Expression))
{
return(Double.NaN);
}
var _unitList = new List <IComputeUnit>();
try
{
var parameters = GetParameterStrings(this.Expression);
foreach (var parameter in parameters)
{
var unit = NumericCalculator.Parse(parameter);
if (unit == null)
{
return(Double.NaN);
}
_unitList.Add(unit);
}
var values = _unitList.Select(p => p.Compute()).ToList();
return(this.ApplyFunction(values));
}
catch
{
return(Double.NaN);
}
finally
{
_unitList.Clear();
}
}
public Double Calculate(List <String> variableValues)
{
try
{
if (variableValues == null || this.VariableNames.Count != variableValues.Count || variableValues.Any(p => !Helper.IsNumericValue(p)))
{
return(Double.NaN);
}
var strNumericExpression = Regex.Replace(this.Expression, " ", "");
var newValues = variableValues.Select(p => p.TrimStart('+')).Select(p => p[0] == '-' ? String.Format("({0})", p) : p).ToList();
for (int i = 0; i < this.VariableNames.Count; i++)
{
strNumericExpression = Regex.Replace(strNumericExpression, String.Format(@"\b{0}\b", this.VariableNames[i]), newValues[i]);
}
var expressionUnit = NumericCalculator.Parse(strNumericExpression);
if (expressionUnit != null)
{
return(expressionUnit.Compute());
}
return(Double.NaN);
}
catch
{
return(Double.NaN);
}
}
public ComputeUnit(String strExpression)
{
this.Expression = NumericCalculator.Normalize(strExpression);
}