def test_minimize_repetition(self):
dfa = DeterministicFiniteAutomaton()
symb_a = Symbol('a')
symb_b = Symbol("b")
symb_star = Symbol("star")
states = [State(x) for x in range(9)]
dfa.add_start_state(states[0])
dfa.add_final_state(states[3])
dfa.add_final_state(states[4])
dfa.add_final_state(states[7])
dfa.add_final_state(states[8])
dfa.add_transition(states[0], symb_a, states[1])
dfa.add_transition(states[1], symb_star, states[2])
dfa.add_transition(states[2], symb_a, states[3])
dfa.add_transition(states[3], symb_star, states[4])
dfa.add_transition(states[3], symb_a, states[1])
dfa.add_transition(states[3], symb_b, states[5])
dfa.add_transition(states[4], symb_a, states[1])
dfa.add_transition(states[4], symb_b, states[5])
dfa.add_transition(states[0], symb_b, states[5])
dfa.add_transition(states[5], symb_star, states[6])
dfa.add_transition(states[6], symb_b, states[7])
dfa.add_transition(states[7], symb_star, states[8])
dfa.add_transition(states[7], symb_a, states[1])
dfa.add_transition(states[7], symb_b, states[5])
dfa.add_transition(states[8], symb_a, states[1])
dfa.add_transition(states[8], symb_b, states[5])
dfa = dfa.minimize()
self.assertTrue(dfa.accepts([symb_a, symb_star, symb_a]))
def test_big_minimize(self):
dfa = DeterministicFiniteAutomaton()
size = 1000
symb = Symbol("s")
dfa.add_start_state(State(0))
dfa.add_final_state(State(size))
for i in range(size):
dfa.add_transition(State(i), symb, State(i + 1))
dfa = dfa.minimize()
self.assertEqual(len(dfa.states), size + 1)
self.assertFalse(dfa.accepts([symb]))
def test_big_minimize_reduce(self):
dfa = DeterministicFiniteAutomaton()
symb_0 = Symbol("0")
symb_0_minus = Symbol("0-")
symb_1 = Symbol("1")
symb_1_minus = Symbol("1-")
symb_star = Symbol("STAR")
start = State("start")
states = [State(str(x)) for x in range(10)]
dfa.add_start_state(start)
dfa.add_final_state(states[2])
dfa.add_final_state(states[3])
dfa.add_final_state(states[4])
dfa.add_final_state(states[8])
dfa.add_final_state(states[7])
dfa.add_final_state(states[9])
dfa.add_transition(start, symb_0, states[0])
dfa.add_transition(states[1], symb_0, states[2])
dfa.add_transition(states[2], symb_0, states[0])
dfa.add_transition(states[3], symb_0, states[0])
dfa.add_transition(states[4], symb_0, states[0])
dfa.add_transition(states[8], symb_0, states[0])
dfa.add_transition(states[7], symb_0, states[0])
dfa.add_transition(states[9], symb_0, states[0])
dfa.add_transition(states[0], symb_star, states[1])
dfa.add_transition(states[5], symb_star, states[6])
dfa.add_transition(states[7], symb_star, states[9])
dfa.add_transition(states[2], symb_star, states[3])
dfa.add_transition(states[4], symb_star, states[8])
dfa.add_transition(states[1], symb_0_minus, states[5])
dfa.add_transition(states[6], symb_0_minus, states[7])
dfa.add_transition(states[3], symb_1_minus, states[4])
self.assertFalse(
dfa.accepts([
"0", "STAR", "0-", "STAR", "0-", "0", "STAR", "0", "0", "STAR",
"0-", "STAR", "0-", "1-"
]))
dfa = dfa.minimize()
self.assertFalse(
dfa.accepts([
"0", "STAR", "0-", "STAR", "0-", "0", "STAR", "0", "0", "STAR",
"0-", "STAR", "0-", "1-"
]))
def minimize_dfa(d: DeterministicFiniteAutomaton):
return d.minimize()
