private decimal Calculate(List <ICalulatorNode> opreationList)
{
if (opreationList.OfType <CalculatorOperationNode>().Any(el => el.Token == MathToken.OpenBrackets))
{
CalculateBraces(opreationList);
}
while (opreationList.OfType <CalculatorOperationNode>().Any(on =>
on.Token == MathToken.Multiply || on.Token == MathToken.Divide))
{
RecalculateIndex(opreationList);
var calculatorOperationNode = opreationList.OfType <CalculatorOperationNode>().First(on =>
@on.Token == MathToken.Multiply || @on.Token == MathToken.Divide);
var Index = calculatorOperationNode.Index;
var firstValue = ((CalulatorValueNode)opreationList[Index - 1]).Value;
var operationValue = ((CalulatorValueNode)opreationList[calculatorOperationNode.Index + 1]).Value;
firstValue = PerformOperation(firstValue, calculatorOperationNode.Token, operationValue);
opreationList.RemoveAt(Index + 1);
opreationList.RemoveAt(Index);
opreationList[Index - 1] = new CalulatorValueNode(firstValue, Index - 1);
RecalculateIndex(opreationList);
}
var result = ((CalulatorValueNode)opreationList[0]).Value;
opreationList.RemoveAt(0);
while (opreationList.Count != 0)
{
var operation = ((CalculatorOperationNode)opreationList[0]).Token;
var operationValue = ((CalulatorValueNode)opreationList[1]).Value;
result = PerformOperation(result, operation, operationValue);
opreationList.RemoveAt(0);
opreationList.RemoveAt(0);
}
return(result);
}
public List <ICalulatorNode> Parse(string input)
{
var calulatorNodes = new List <ICalulatorNode>();
//macthes both : and / as divide symbol
string Pattern = @"[\d]+|[\*\+\(\)\-\/\:]";
Regex rex = new Regex(Pattern,
RegexOptions.Compiled | RegexOptions.IgnoreCase);
MatchCollection matches = rex.Matches(input);
int index = 0;
foreach (Match match in matches)
{
int parsedresult;
var tryParse = int.TryParse(match.Value, out parsedresult);
if (tryParse)
{
if (CheckIFMinus(calulatorNodes))
{
calulatorNodes[index - 1] = new CalulatorValueNode(-parsedresult, index - 1);
}
else
{
calulatorNodes.Add(new CalulatorValueNode(parsedresult, index));
index++;
}
}
else
{
MathToken token = ParseToken(match.Value);
calulatorNodes.Add(new CalculatorOperationNode(token, index));
index++;
}
}
return(calulatorNodes);
}
