private static void Draw(RegexState regexState, StringBuilder sb, HashSet<string> set)
{
if (set.Contains(regexState.ToString())) {
return;
}
set.Add(regexState.ToString());
if (!regexState.IsFinalStates) {
sb.Append($" {regexState} [shape=\"circle\"];\n");
}
foreach (var transition in regexState.Transitions) {
sb.Append($" {regexState} -> {transition.Value}[label=\"{transition.Key}\"];\n");
Draw(transition.Value, sb, set);
}
foreach (var state in regexState.Epsilon) {
sb.Append($" {regexState} -> {state}[label=\"ε\"];\n");
Draw(state, sb, set);
}
}
