List<Symbol> Follow(Formula formula, bool terminal = true)
{
List<Symbol> list = new List<Symbol>();
foreach (var symbol in formula.Symbols)
{
if (symbol.IsTerminal == terminal)
list.Add(symbol);
}
return list;
}
Symbol First(Formula formula, bool terminal = true)
{
foreach (var symbol in formula.Symbols)
{
if (symbol.IsTerminal == terminal)
return symbol;
}
return null;
}