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f00 nfa

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Adam 2021-01-03 20:16:21 +01:00
parent 8a33bb69fa
commit 1d1a048572
1 changed files with 140 additions and 21 deletions
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161
TaskF00/run.py
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@ -1,10 +1,8 @@
import sys
import os
#./run test1.arg < test1.in > test1.out
filename = sys.argv[1]
# filename = 'long.arg'
# filename = 'test1.arg'
path = os.path.join(os.getcwd(), filename)
file = open(path, 'r').readlines()
@ -17,39 +15,154 @@ class FSA():
self.alphabet = set()
self.transition_function = []
self.end_state = []
self.all_states = set()
self.is_nfa = 0
def add_letter_to_alphabet(self, letter):
self.alphabet.add(letter)
def add_transition_to_transition_function(self, input_state, output_state, letter):
self.all_states.add(input_state)
self.all_states.add(output_state)
if len(self.transition_function) > 0:
for x, function in enumerate(self.transition_function):
if function['in'] == input_state and function['out'] == output_state:
self.transition_function[x]['letter'].append(letter)
if function['in'] == input_state and function['letter'] == letter:
self.transition_function[x]['out'].append(output_state)
return
obj = {'in': input_state, 'letter': [letter], 'out': output_state}
obj = {'in': input_state, 'letter': letter, 'out': [output_state]}
self.transition_function.append(obj)
else:
obj = {'in': input_state, 'letter':[letter], 'out': output_state}
obj = {'in': input_state, 'letter': letter, 'out': [output_state]}
self.transition_function.append(obj)
# add letter to alphabet
def specify_end_state(self, end_state):
self.end_state.append(end_state)
def check_text(self, text):
for letter in text:
if letter not in self.alphabet:
return 'NO'
found_function = None
for func in self.transition_function:
if func['in'] == self.current_state and letter in func['letter']:
found_function = func
if not found_function:
return 'NO'
self.current_state = found_function['out']
# print('Input text:{} output text:{} current state:{}'.format(text, output_text, self.current_state))
def nfa_to_dfa(self):
nfa = dict()
for x in FSA.all_states:
nfa[x] = {}
for a in FSA.alphabet:
a_dict = {a: None}
nfa[x].update(a_dict)
for function in self.transition_function:
nfa[function['in']][function['letter']] = function['out']
trap_state_in = str(int(sorted(FSA.all_states, reverse=True)[0]) + 1)
trap_state = {trap_state_in: {}}
for a in FSA.alphabet:
a_dict = {a: trap_state_in}
trap_state[trap_state_in].update(a_dict)
dfa = {}
dfa_keys = []
new_states_list = []
dfa.update(trap_state)
# first row
state = FSA.initial_state
nfa_function = nfa[state]
dfa_keys.append(state)
dfa_function = dict()
for letter in FSA.alphabet:
if not nfa_function[letter]:
dfa_function[letter] = trap_state_in
continue
if nfa_function[letter] and len(nfa_function[letter]) > 1:
new_state_in = ''.join(nfa_function[letter])
for i in self.end_state:
if i in nfa_function[letter]:
self.specify_end_state(new_state_in)
dfa_function[letter] = new_state_in
new_states_list.append(new_state_in)
continue
if len(nfa_function[letter]) == 1:
new_state = nfa_function[letter][0]
dfa_function[letter] = new_state
if new_state not in new_states_list:
new_states_list.append(new_state)
continue
dfa[state] = dfa_function
while len(new_states_list) != 0:
new_dfa_state = new_states_list.pop(0)
dfa_function = dict()
if len(new_dfa_state) == 1:
nfa_function = nfa[new_dfa_state]
for letter in FSA.alphabet:
if not nfa_function[letter]:
dfa_function[letter] = trap_state_in
continue
if nfa_function[letter] and len(nfa_function[letter]) > 1:
new_state_in = ''.join(nfa_function[letter])
for i in self.end_state:
if i in nfa_function[letter]:
self.specify_end_state(new_state_in)
dfa_function[letter] = new_state_in
if new_state_in not in dfa_keys and new_state_in not in new_states_list:
new_states_list.append(new_state_in)
continue
if len(nfa_function[letter]) == 1:
new_state_in = nfa_function[letter][0]
dfa_function[letter] = new_state_in
if new_state_in not in dfa_keys and new_state_in not in new_states_list:
new_states_list.append(new_state_in)
continue
dfa[new_dfa_state] = dfa_function
else:
dfa_func = {}
for letter in FSA.alphabet:
dfa_func[letter] = None
for let in FSA.alphabet:
new_letter = None
for state in new_dfa_state:
nfa_letter = nfa[state][let]
if nfa_letter:
new_letter = ''.join(nfa_letter)
if new_letter not in dfa_keys and new_letter not in new_states_list:
new_states_list.append(new_letter)
if not new_letter:
new_letter = trap_state_in
dfa_func[let] = new_letter
dfa[new_dfa_state] = dfa_func
self.transition_function = dfa
def check_text(self, text):
if self.is_nfa == 0:
for letter in text:
if letter not in self.alphabet:
return 'NO'
found_function = None
for func in self.transition_function:
if func['in'] == self.current_state and func['letter'] == letter:
found_function = func
if not found_function:
return 'NO'
self.current_state = found_function['out'][0]
else:
for letter in text:
if letter not in self.alphabet:
return 'NO'
found_function = self.transition_function[self.current_state][letter]
self.current_state = found_function
if self.current_state in self.end_state:
return 'YES'
else:
@ -68,10 +181,16 @@ for line in file:
else:
FSA.specify_end_state(line[0])
for function in FSA.transition_function:
if len(function['out']) > 1:
FSA.is_nfa = 1
FSA.nfa_to_dfa()
break
lines = ['']
lines = ['xyz']
for line in sys.stdin:
line = line.rstrip('\n')
FSA.current_state = FSA.initial_state
print(FSA.check_text(line))
print(FSA.check_text(line))