public string Parse(string task)
{
string[] taskInLines = Regex.Split(PrepareTask(task).Replace(" ", ""), "(?<=[-+*/()^])|(?=[-+*/()^])").Where(i => i != "").ToArray();
foreach (var taskLine in taskInLines)
{
if (IsNegative(taskLine))
{
_isCurrentNegative = true;
continue;
}
if (!CalculatorUtilities.IsOperatorOrBracket(taskLine))
{
_convertedTask += (IsNegativeNumber(taskLine) ? "-" : "") + (taskLine + " ");
_isCurrentNegative = false;
}
else
{
OperationsPriorityHandler(taskLine);
}
_taskLineBefore = taskLine;
}
if (_operationsBuffer.Count > 0)
{
OperationsPriorityHandler(isLast: true);
}
return(_convertedTask);
}
public double Calculate(string rpnTask)
{
if (string.IsNullOrEmpty(rpnTask))
{
return(0);
}
var task = new List <string>(rpnTask.Split(' '));
var taskBuffer = new Stack <double>();
foreach (var taskLine in task)
{
if (!string.IsNullOrEmpty(taskLine))
{
taskBuffer.Push(
!CalculatorUtilities.IsOperatorOrBracket(taskLine)
? double.Parse(taskLine)
: CalculatorUtilities.Compute(taskLine, taskBuffer.Pop(), taskBuffer.Pop())
);
}
}
return(taskBuffer.Count <= 1 ? taskBuffer.Pop() : taskBuffer.Sum());
}
private bool IsNegativeNumber(string currentLine)
{
return(_isCurrentNegative && !CalculatorUtilities.IsOperatorOrBracket(currentLine));
}