def to_nfa_design(self):
pattern_nfa_design = self.pattern.to_nfa_design
start_state = State()
accept_states = pattern_nfa_design.accept_states + [start_state]
rules = pattern_nfa_design.rulebook.rules
extra_rules = [
FARule(accept_state, None, pattern_nfa_design.start_state)
for accept_state in pattern_nfa_design.accept_states
] + [FARule(start_state, None, pattern_nfa_design.start_state)]
rulebook = NFARulebook(rules + extra_rules)
return NFADesign(start_state, accept_states, rulebook)
def to_nfa_design(self):
first_nfa_design, second_nfa_design = (
self.first.to_nfa_design,
self.second.to_nfa_design,
)
start_state = State()
accept_states = first_nfa_design.accept_states + second_nfa_design.accept_states
rules = first_nfa_design.rulebook.rules + second_nfa_design.rulebook.rules
extra_rules = [
FARule(start_state, None, nfa_design.start_state)
for nfa_design in [first_nfa_design, second_nfa_design]
]
rulebook = NFARulebook(rules + extra_rules)
return NFADesign(start_state, accept_states, rulebook)
def test_free_move():
rulebook = NFARulebook([
FARule(1, None, 2),
FARule(1, None, 4),
FARule(2, "a", 3),
FARule(3, "a", 2),
FARule(4, "a", 5),
FARule(5, "a", 6),
FARule(6, "a", 4),
])
assert rulebook.next_states([1], None) == set([2, 4])
assert rulebook.follow_free_moves([1]) == set([1, 2, 4])
nfa_design = NFADesign(1, [2, 4], rulebook)
assert nfa_design.accepts("aaaaaa")
assert nfa_design.accepts("aaa")
assert nfa_design.accepts("aa")
assert not (nfa_design.accepts("aaaaa"))
assert not (nfa_design.accepts("a"))
def test_free_move(self):
rulebook = NFARulebook(
[
FARule(1, None, 2),
FARule(1, None, 4),
FARule(2, "a", 3),
FARule(3, "a", 2),
FARule(4, "a", 5),
FARule(5, "a", 6),
FARule(6, "a", 4),
]
) # yapf: disable
self.assertEqual(rulebook.next_states([1], None), set([2, 4]))
self.assertEqual(rulebook.follow_free_moves([1]), set([1, 2, 4]))
nfa_design = NFADesign(1, [2, 4], rulebook)
self.assertTrue(nfa_design.accepts("aaaaaa"))
self.assertTrue(nfa_design.accepts("aaa"))
self.assertTrue(nfa_design.accepts("aa"))
self.assertFalse(nfa_design.accepts("aaaaa"))
self.assertFalse(nfa_design.accepts("a"))
def test_nfa_design():
rulebook = NFARulebook([
FARule(1, "a", 1),
FARule(1, "b", 1),
FARule(1, "b", 2),
FARule(2, "a", 3),
FARule(2, "b", 3),
FARule(3, "a", 4),
FARule(3, "b", 4),
])
nfa = NFADesign(1, [4], rulebook)
assert nfa.accepts("bab")
assert nfa.accepts("bbbbb")
assert not (nfa.accepts("bbabb"))
rulebook = NFARulebook([
FARule(1, "a", 1),
FARule(1, "a", 2),
FARule(1, None, 2),
FARule(2, "b", 3),
FARule(3, "b", 1),
FARule(3, None, 2),
])
assert rulebook.alphabet == set(["a", "b"])
nfa_design = NFADesign(1, [3], rulebook)
assert nfa_design.to_nfa.current_states == set([1, 2])
assert nfa_design.to_nfa_from([3]).current_states == set([2, 3])
nfa = nfa_design.to_nfa_from([2, 3])
nfa.read_character("b")
assert nfa.current_states == set([1, 2, 3])
simulation = NFASimulation(nfa_design)
assert simulation.next_state([1, 2], "a") == set([1, 2])
assert simulation.next_state([1, 2], "b") == set([3, 2])
assert simulation.next_state([3, 2], "b") == set([1, 3, 2])
assert simulation.next_state([1, 3, 2], "b") == set([1, 3, 2])
assert simulation.next_state([1, 3, 2], "a") == set([1, 2])
dfa_design = simulation.to_dfa_design
assert not (dfa_design.accepts("aaa"))
assert dfa_design.accepts("aab")
assert dfa_design.accepts("bbbabb")
def test_nfa_design(self):
rulebook = NFARulebook(
[
FARule(1, "a", 1),
FARule(1, "b", 1),
FARule(1, "b", 2),
FARule(2, "a", 3),
FARule(2, "b", 3),
FARule(3, "a", 4),
FARule(3, "b", 4),
]
) # yapf: disable
nfa = NFADesign(1, [4], rulebook)
self.assertTrue(nfa.accepts("bab"))
self.assertTrue(nfa.accepts("bbbbb"))
self.assertFalse(nfa.accepts("bbabb"))
rulebook = NFARulebook(
[
FARule(1, "a", 1),
FARule(1, "a", 2),
FARule(1, None, 2),
FARule(2, "b", 3),
FARule(3, "b", 1),
FARule(3, None, 2),
]
) # yapf: disable
self.assertEqual(rulebook.alphabet, set(["a", "b"]))
nfa_design = NFADesign(1, [3], rulebook)
self.assertEqual(nfa_design.to_nfa.current_states, set([1, 2]))
self.assertEqual(nfa_design.to_nfa_from([3]).current_states, set([2, 3]))
nfa = nfa_design.to_nfa_from([2, 3])
nfa.read_character("b")
self.assertEqual(nfa.current_states, set([1, 2, 3]))
simulation = NFASimulation(nfa_design)
self.assertEqual(simulation.next_state([1, 2], "a"), set([1, 2]))
self.assertEqual(simulation.next_state([1, 2], "b"), set([3, 2]))
self.assertEqual(simulation.next_state([3, 2], "b"), set([1, 3, 2]))
self.assertEqual(simulation.next_state([1, 3, 2], "b"), set([1, 3, 2]))
self.assertEqual(simulation.next_state([1, 3, 2], "a"), set([1, 2]))
dfa_design = simulation.to_dfa_design
self.assertFalse(dfa_design.accepts("aaa"))
self.assertTrue(dfa_design.accepts("aab"))
self.assertTrue(dfa_design.accepts("bbbabb"))
def to_nfa_design(self):
start_state = State()
accept_state = State()
rule = FARule(start_state, self.character, accept_state)
rulebook = NFARulebook([rule])
return NFADesign(start_state, [accept_state], rulebook)
def to_nfa_design(self):
start_state = State()
accept_states = [start_state]
rulebook = NFARulebook([])
return NFADesign(start_state, accept_states, rulebook)