private static string HandleNegativeBrackets(string task)
{
IEnumerable <string> taskInBrackets = Regex.Split(task.Replace(" ", ""), "([-]{1}[(]{1}|[(]{1}|[)]{1})").Where(i => i != "").ToArray();
string taskWithWrappedNegativeBrackets = "";
var bracketsCache = new Stack <string>();
string lastLine = "";
// Handling negative brackets
foreach (string currentLine in taskInBrackets)
{
if (CalculatorUtilities.IsOperator(lastLine.LastOrDefault().ToString()) && currentLine.Equals("-("))
{
bracketsCache.Push("-(");
taskWithWrappedNegativeBrackets += "(0";
}
if (lastLine.Equals("-(") && currentLine.Equals("-("))
{
taskWithWrappedNegativeBrackets += "0";
}
else if (currentLine.Equals("(") && bracketsCache.Count > 0)
{
bracketsCache.Push("(");
}
else if (currentLine.Equals(")") && bracketsCache.Count > 0 && bracketsCache.Pop().Equals("-("))
{
taskWithWrappedNegativeBrackets += ")";
}
lastLine = currentLine;
taskWithWrappedNegativeBrackets += currentLine;
}
return(taskWithWrappedNegativeBrackets);
}
private bool IsNegative(string currentLine)
{
return((_taskLineBefore == "" || _taskLineBefore == "(" || CalculatorUtilities.IsOperator(_taskLineBefore)) && currentLine.Equals("-"));
}
