private void AppendOperationsUpToOpeningBracket()
{
var lastOperation = _operationsStack.Pop();
while (!(lastOperation is OpeningBracket) && lastOperation is Operation operation)
{
_convertedEquation.Push(operation);
lastOperation = _operationsStack.Pop();
}
}
public EquationItem[] ParseEquationItems(string equation)
{
if (string.IsNullOrWhiteSpace(equation))
{
throw new ArgumentNullException(nameof(equation), "Equation not provided");
}
_equationItemsStack = new Stack <EquationItem>();
_operandBuilder.Clear();
foreach (var sign in equation)
{
var bracket = _bracketsFactory.InitializeFromSign(sign);
var operation = _operationFactory.InitializeFromSign(sign);
if (bracket != null || operation != null)
{
var equationItem = bracket ?? (EquationItem)operation;
AppendOperand();
_equationItemsStack.Push(equationItem);
}
else
{
_operandBuilder.Append(sign);
}
}
AppendOperand();
return(_equationItemsStack.Items);
}
private void AppendOperand()
{
if (_operandBuilder.Length == 0)
{
return;
}
var operand = _operandBuilder.ToString();
//will parse if there are spaces vefore and/or after decimal
if (decimal.TryParse(operand, out var operandValue))
{
_equationItemsStack.Push(new Operand(operandValue));
_operandBuilder.Clear();
}
else
{
throw new NotSupportedException($"Lexeme '{operand}' is not supported");
}
}