private static void BuildSuffixAutomaton(char[] x, ref Graph aut)
{
int i, art, init, last, p, q, r, m = (x.Length - 1);
char c;
init = Automata.GetInitial(aut);
art = Automata.NewVertex(aut);
Automata.SetSuffixLink(aut, init, art);
last = init;
for (i = 0; i < m; ++i)
{
c = x[i];
p = last;
q = Automata.NewVertex(aut);
Automata.SetLength(aut, q, Automata.GetLength(aut, p) + 1);
Automata.SetPosition(aut, q, Automata.GetPosition(aut, p) + 1);
while (p != init &&
Automata.GetTarget(aut, p, c) == -1)
{
Automata.SetTarget(aut, p, c, q);
Automata.SetShift(aut, p, c, Automata.GetPosition(aut, q)
- Automata.GetPosition(aut, p) - 1);
p = Automata.GetSuffixLink(aut, p);
}
if (Automata.GetTarget(aut, p, c) == -1)
{
Automata.SetTarget(aut, init, c, q);
Automata.SetShift(aut, init, c, Automata.GetPosition(aut, q)
- Automata.GetPosition(aut, init) - 1);
Automata.SetSuffixLink(aut, q, init);
}
else if (Automata.GetLength(aut, p) + 1 == Automata.GetLength(
aut, Automata.GetTarget(aut, p, c)))
{
Automata.SetSuffixLink(aut, q, Automata.GetTarget(aut, p, c));
}
else
{
r = Automata.NewVertex(aut);
Automata.CopyVertex(aut, r, Automata.GetTarget(aut, p, c));
Automata.SetLength(aut, r, Automata.GetLength(aut, p) + 1);
Automata.SetSuffixLink(aut, Automata.GetTarget(aut, p, c), r);
Automata.SetSuffixLink(aut, q, r);
while (p != art &&
Automata.GetLength(aut, Automata
.GetTarget(aut, p, c)) >= Automata.GetLength(
aut, r))
{
Automata.SetShift(aut, p, c, Automata.GetPosition(aut,
Automata.GetTarget(aut, p, c))
- Automata.GetPosition(aut, p) - 1);
Automata.SetTarget(aut, p, c, r);
p = Automata.GetSuffixLink(aut, p);
}
}
last = q;
}
Automata.SetTerminal(aut, last);
while (last != init)
{
last = Automata.GetSuffixLink(aut, last);
Automata.SetTerminal(aut, last);
}
}