/// <summary>
/// Calculates the members of the bracket.
/// </summary>
/// <returns>An object represent the result of calculation operation.</returns>
public object calculate()
{
int operatorIdx;
while (_childs.Count > 1)
{
operatorIdx = -1;
foreach (char c in OPERATORS)
{
if (_childs.Contains(c.ToString().Trim()))
{
operatorIdx = _childs.IndexOf(c.ToString().Trim());
break;
}
}
if (operatorIdx == -1)
{
break;
}
operateChild((string)_childs[operatorIdx], operatorIdx);
}
if (_function != null)
{
return(_function.calculate(this));
}
return(_childs[0]);
}