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c3.py
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class DFA:
def __init__(self):
self.num_states = 0
self.states = [] # states in the DFA
self.symbols = [0, 1] # alphabet set in the DFA
self.i_state = '' # initial state of DFA
self.f_states = [] # final states of DFA
self.num_f_states = 0
self.nf_states = []
self.num_nf_states = 0
self.transf_0 = {}
self.transf_1 = {}
#self.M = [[0 for i in range(len(self.symbols))] for j in range(len(self.states))]
def construct_dfa_from_file(self, lines):
self.states = list(lines[0].strip())
self.num_states = len(self.states)
#self.symbols = list(int(lines[2].strip()))
f_states_line = []
f_states_line = lines[3].split(" ")
for i in range(len(f_states_line)):
if i == 0:
self.f_states = f_states_line[i]
else:
self.f_states += f_states_line[i].strip()
self.i_state = lines[2]
nf_states_line = []
nf_states_line = lines[4].split(" ")
for i in range(len(nf_states_line)):
if i == 0:
self.nf_states = nf_states_line[i]
else:
self.nf_states += nf_states_line[i].strip()
for i in range(5, len(lines)):
transf_line = lines[i].split(" ")
start_state = (transf_line[0].strip())
trans_symbol = int(transf_line[1])
end_state = (transf_line[2].strip())
if trans_symbol == 0 :
self.transf_0.update({start_state : end_state})
else :
self.transf_1.update({start_state : end_state})
'''trans_func = (start_state, trans_symbol, end_state);
self.transf.append(trans_func)'''
print(self.transf_0)
print(self.transf_1)
def rm_unreachable_states(self): #function for removing the unreachable states
pass
def is_equiv(self,a,b) :
print(self.transf_0[a])
print(self.transf_0[b])
if self.transf_0[a] == self.transf_0[b] :
if self.transf_1[a] == self.transf_1[b] :
return True
for i in range(0, len(self.vset)) :
for j in vset[i] :
if (self.transf_1[a] in vset[i]) and (self.transf_1[b] in vset[i]) :
return True
else :
False
for i in range(0, len(self.vset)) :
#for j in self.vset[i] :
if (self.transf_0[a] in self.vset[i]) and (self.transf_0[b] in self.vset[i]) :
if self.transf_1[a] == self.transf_1[b] :
return True
for i in range(0, len(self.vset)) :
#for j in vset[i] :
if self.transf_1[a] in self.vset[i] and self.transf_1[b] in self.vset[i] :
return True
else :
False
else :
False
def minimize_dfa(self):
self.rm_unreachable_states()
self.vset = [self.nf_states, self.f_states]
print(self.vset)
wset = [self.vset[0]]
print(wset)
xset = []
k = 0
while xset != wset :
xset = wset
for i in range(0,len(self.vset)) :
var = self.vset[i]
wset.append(var)
for j in range(0, len(var)) :
#print(var[j])
#print(var[j+1])
#if var[j+1] :
#print(var[j+1])
if self.is_equiv(var[j].strip(), var[j+1].strip()) is True:
print(wset)
wset[k] += var[j+1].strip()
else :
wset.append(var[j+1])
k += 1
k += 1
vset = wset
transfm_0 = {}
transfm_1 = {}
for i in self.transf_0 :
for j in vset :
for l in vset[j] :
if i is vset[j][l] :
for k in vset :
for m in vset[k] :
if self.transf_0[i] is vset[k][m] :
transfm_0.update({vset[j] : vset[k]})
for i in self.transf_1 :
for j in vset :
for l in vset[j] :
if i is vset[j][l] :
for k in vset :
for m in vset[k] :
if self.transf_1[i] is vset[k][m] :
transfm_1.update({vset[j] : vset[k]})
final_states = []
for i in vset :
for j in vset[i] :
if self.i_state is vset[i][j] :
initial_state = vset[i]
for j in self.f_states :
if f_states[j] is vest[i][j] :
final_states.append(vest[i])
mstates = vset
num_mstates = len(mstates)
num_finalstates = len(final_states)
print(mstates)
'''
while wset != [] :
s = extract(wset)
wset.remove(self.f_states)
for i in len(self.symbols) :
for self.symbols[i] in self.symbols :
for x in vset :
(x1, x2) = split(x, s, self.symbols[i])
vset = vset.difference(set(x))
vset = vset + list(x1) + list(x2)
if len(x1) < len(x2) :
wset = wset + list(x1)
else :
wset = wset + list(x2)
return vset
def split(x, s, a) :
'''
filename = input('Enter the name of the DFA file: ')
file = open(filename, 'r')
lines = file.readlines()
file.close()
dfa = DFA()
dfa.construct_dfa_from_file(lines)
dfa.minimize_dfa()