private void Generate(StringBuilder builder, State state)
{
var transitions = state.GetSortedTransitions(true);
if (transitions.Count == 0)
{
if (!state.Accept)
{
throw new InvalidOperationException("state");
}
return;
}
int nroptions = state.Accept ? transitions.Count : transitions.Count - 1;
int option = Xeger.GetRandomInt(0, nroptions, random);
if (state.Accept && option == 0)
{
// 0 is considered stop.
return;
}
// Moving on to next transition.
Transition transition = transitions[option - (state.Accept ? 1 : 0)];
this.AppendChoice(builder, transition);
Generate(builder, transition.To);
}
private static object CreateAnonymous(RegularExpressionRequest request)
{
string pattern = request.Pattern;
try
{
string regex = new Xeger(pattern).Generate();
if (Regex.IsMatch(regex, pattern))
{
return regex;
}
}
catch (InvalidOperationException)
{
#pragma warning disable 618
return new NoSpecimen(request);
#pragma warning restore 618
}
catch (ArgumentException)
{
#pragma warning disable 618
return new NoSpecimen(request);
#pragma warning restore 618
}
#pragma warning disable 618
return new NoSpecimen(request);
#pragma warning restore 618
}
private void AppendChoice(StringBuilder builder, Transition transition)
{
var c = (char)Xeger.GetRandomInt(transition.Min, transition.Max, random);
builder.Append(c);
}
