// in addition to creating the TokenType object, set the accepting state for the regex
public TokenType(String name, Regex regex, Priority priority = Priority.Default)
{
this.name = name;
this.regex = regex;
this.tokenPriority = priority;
regex.DefineTokenClass(this);
}
// combines the regexes (their internal NFA-like structure)
public static TokenAutomaton CombinedAutomaton(params TokenType[] ts)
{
Regex[] rs = new Regex[ts.Length];
for (int i = 0; i < ts.Length; i++)
rs[i] = ts[i].regex;
Regex combined = Regex.Union(rs);
return combined.ConstructAutomaton();
}
public Regex Union(Regex other)
{
Node start = new Node();
Node end = new Node();
start.epsilonTransitions.Add(this.start);
start.epsilonTransitions.Add(other.start);
this.end.epsilonTransitions.Add(end);
other.end.epsilonTransitions.Add(end);
return new Regex(start, end);
}
public Regex Concat(Regex other)
{
this.end.epsilonTransitions.Add(other.start);
return new Regex(this.start, other.end);
}