private static double?Parse(string question)
{
if (VariableExpression.IsMatch(question))
{
KeyValuePair <string, double> variable = VariableExpression.Parse(question);
MathExpression.AddVariable(variable.Key, variable.Value);
return(variable.Value);
}
else if (PercentOfExpression.IsMatch(question))
{
return(PercentOfExpression.Parse(question));
}
else if (PercentOffExpression.IsMatch(question))
{
return(PercentOffExpression.Parse(question));
}
else if (MathExpression.IsMatch(question))
{
return(MathExpression.Parse(question));
}
else
{
return(null);
}
}
public static bool IsMatch(string expression)
{
if (!Regex.IsMatch(expression, REGEX_PATTERN))
{
return(false);
}
int index = expression.IndexOf("=") + 1;
string parsedExpression = expression.Substring(index).Trim();
return(MathExpression.IsMatch(parsedExpression));
}
