private void AddNext(Bracket bracket)
{
if (bracket.IsOpen)
{
if (_prevElement is Variable || IsCloseBracket(_prevElement))
{
throw new LogicException("Before open bracket can not be variable or close bracket.");
}
_operationsStack.Push(bracket);
}
else
{
if (!(_prevElement is Variable || IsCloseBracket(_prevElement)))
{
throw new LogicException("Before close bracket can be only variable or close bracket.");
}
while (true)
{
if (_operationsStack.Count == 0)
{
throw new LogicException("For close bracket not found open bracket.");
}
FormulaElement next = _operationsStack.Pop();
if (next is Bracket openBracket)
{
if (Bracket.IsPair(openBracket, bracket))
{
break;
}
else
{
throw new LogicException("Wrong brackets arrangement.");
}
}
else if (next is Operation)
{
_resultStack.Push(next);
}
}
}
}