private LookAheadSet FindConflicts(ProductionPattern pattern,
int maxLength)
{
LookAheadSet result = new LookAheadSet(maxLength);
for (int i = 0; i < pattern.Count; i++)
{
var set1 = pattern[i].LookAhead;
for (int j = 0; j < i; j++)
{
var set2 = pattern[j].LookAhead;
result.AddAll(set1.CreateIntersection(set2));
}
}
if (result.IsRepetitive())
{
ThrowAmbiguityException(pattern.Name, null, result);
}
return(result);
}