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main.py
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main.py
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from Fact import Fact
from Rule import Rule
from sys import argv
from parser import parse_rule
facts = {}
queries = []
letters = 'QWERTYUIOPASDFGHJKLZXCVBNM'
def get_rule_parts(rule):
i, j, fact = 0, 0, True
right = []
left = []
while (rule.operations[j] != '=>' and rule.operations[j] != '<=>') or fact:
if fact:
if j < len(rule.operations) and rule.operations[j] == '!':
left += [rule.operations[j], rule.facts[i]]
i += 1
j += 1
else:
left.append(rule.facts[i])
i += 1
fact = False
else:
left.append(rule.operations[j])
fact = True
j += 1
j += 1
fact = True
while j < len(rule.operations) or i < len(rule.facts):
if fact:
if j < len(rule.operations) and rule.operations[j] == '!':
right += [rule.operations[j], rule.facts[i]]
i += 1
j += 1
else:
right.append(rule.facts[i])
i += 1
fact = False
else:
right.append(rule.operations[j])
j += 1
return left, right
def arr_to_rule(arr):
rule = Rule()
for i in arr:
if i in letters:
rule.facts.append(i)
else:
rule.operations.append(i)
return rule
def apply_rule(rule, value):
changed = []
rule = arr_to_rule(rule)
if len(rule.operations) == 0 and len(rule.facts) == 1:
if value == True:
if facts[rule.facts[0]].value == False or facts[rule.facts[0]].value is None:
changed.append(rule.facts[0])
facts[rule.facts[0]].value = True
elif value is None:
if facts[rule.facts[0]].value == False:
changed.append(rule.facts[0])
facts[rule.facts[0]].value = None
else:
if facts[rule.facts[0]].value == True:
print("Your rules are inconsistent")
exit(1)
return changed
elif len(rule.operations) == 1 and rule.operations[0] == '!' and len(rule.facts) == 1:
if value == False:
if facts[rule.facts[0]].value == False or facts[rule.facts[0]].value is None:
changed.append(rule.facts[0])
facts[rule.facts[0]].value = True
elif value == True:
if facts[rule.facts[0]].value == True:
print("Your rules are inconsistent")
exit(1)
return changed
if rule.operations[0] == '!':
left_value = not facts[rule.facts[0]].value if facts[rule.facts[0]].value else None
else:
left_value = facts[rule.facts[0]].value if facts[rule.facts[0]].value else None
if (len(rule.operations) == 2 and rule.operations[0] == '!') or (len(rule.operations) == 3 and rule.operations[2] == '!'):
right_value = not facts[rule.facts[1]].value if facts[rule.facts[1]].value else None
else:
right_value = facts[rule.facts[1]].value if facts[rule.facts[1]].value else None
if '^' in rule.operations:
if value == True:
if right_value == True and left_value == True:
if facts[rule.facts[0]].value == False and facts[rule.facts[1]].value == False:
changed.append(rule.facts[0])
changed.append(rule.facts[1])
facts[rule.facts[0]].value = None
facts[rule.facts[1]].value = None
elif facts[rule.facts[0]].value == False:
changed.append(rule.facts[0])
facts[rule.facts[0]].value = True
elif facts[rule.facts[1]].value == False:
changed.append(rule.facts[1])
facts[rule.facts[1]].value = True
else:
print("Your rules are inconsistent")
exit(1)
elif right_value == False and left_value == False:
if facts[rule.facts[0]].value == False and facts[rule.facts[1]].value == False:
changed.append(rule.facts[0])
changed.append(rule.facts[1])
facts[rule.facts[0]].value = None
facts[rule.facts[1]].value = None
elif facts[rule.facts[0]].value == False:
changed.append(rule.facts[0])
facts[rule.facts[0]].value = True
elif facts[rule.facts[1]].value == False:
changed.append(rule.facts[1])
facts[rule.facts[1]].value = True
else:
print("Your rules are inconsistent")
exit(1)
elif right_value is None and left_value == False:
if len(rule.operations) == 1 or (len(rule.operations) == 2 and rule.operations[0] == '!'):
changed.append(rule.facts[1])
facts[rule.facts[1]].value = True
elif left_value is None and right_value == False:
if len(rule.operations) == 1 or (len(rule.operations) == 2 and rule.operations[1] == '!'):
changed.append(rule.facts[0])
facts[rule.facts[0]].value = True
elif value == False:
if right_value == True and left_value == False:
if facts[rule.facts[0]].value == False and facts[rule.facts[1]].value == False:
changed.append(rule.facts[0])
changed.append(rule.facts[1])
facts[rule.facts[0]].value = None
facts[rule.facts[1]].value = None
elif facts[rule.facts[0]].value == False:
changed.append(rule.facts[0])
facts[rule.facts[0]].value = True
elif facts[rule.facts[1]].value == False:
changed.append(rule.facts[1])
facts[rule.facts[1]].value = True
else:
print("Your rules are inconsistent")
exit(1)
elif right_value == False and left_value == False:
if facts[rule.facts[0]].value == False and facts[rule.facts[1]].value == False:
changed.append(rule.facts[0])
changed.append(rule.facts[1])
facts[rule.facts[0]].value = None
facts[rule.facts[1]].value = None
elif facts[rule.facts[0]].value == False:
changed.append(rule.facts[0])
facts[rule.facts[0]].value = True
elif facts[rule.facts[1]].value == False:
changed.append(rule.facts[1])
facts[rule.facts[1]].value = True
else:
print("Your rules are inconsistent")
exit(1)
elif right_value is None and left_value == True:
if len(rule.operations) == 1 or (len(rule.operations) == 2 and rule.operations[0] == '!'):
changed.append(rule.facts[1])
facts[rule.facts[1]].value = True
elif left_value is None and right_value == True:
if len(rule.operations) == 1 or (len(rule.operations) == 2 and rule.operations[1] == '!'):
changed.append(rule.facts[0])
facts[rule.facts[0]].value = True
else:
if facts[rule.facts[0]].value == False:
changed.append(rule.facts[0])
facts[rule.facts[0]].value = None
if facts[rule.facts[1]].value == False:
changed.append(rule.facts[1])
facts[rule.facts[1]].value = None
elif '+' in facts.operations:
if value == True:
if len(rule.operations) > 1:
print("Your rules are inconsistent")
exit(1)
if facts[rule.facts[0].value] != True:
changed.append(rule.facts[0])
facts[rule.facts[0]].value = True
if facts[rule.facts[1].value] != True:
changed.append(rule.facts[1])
facts[rule.facts[1]].value = True
elif value == False:
if right_value == True and left_value == True:
if facts[rule.facts[0]].value == False and facts[rule.facts[1]].value == False:
changed.append(rule.facts[0])
changed.append(rule.facts[1])
facts[rule.facts[0]].value = None
facts[rule.facts[1]].value = None
elif facts[rule.facts[0]].value == False:
changed.append(rule.facts[0])
facts[rule.facts[0]].value = True
elif facts[rule.facts[1]].value == False:
changed.append(rule.facts[1])
facts[rule.facts[1]].value = True
else:
print("Your rules are inconsistent")
exit(1)
elif right_value is None and left_value == True:
if (len(rule.operations) == 2 and rule.operations[1] == '!') or (len(rule.operations) == 3 and rule.operations[2] == '!'):
changed.append(rule.facts[1])
facts[rule.facts[1]].value = True
elif left_value is None and right_value == True:
if (len(rule.operations) == 2 and rule.operations[0] == '!') or (len(rule.operations) == 3 and rule.operations[0] == '!'):
changed.append(rule.facts[0])
facts[rule.facts[0]].value = True
else:
if facts[rule.facts[0]].value == False:
changed.append(rule.facts[0])
facts[rule.facts[0]].value = None
if facts[rule.facts[1]].value == False:
changed.append(rule.facts[1])
facts[rule.facts[1]].value = None
elif '|' in facts.operations:
if value == True:
if right_value == False and left_value == False:
if facts[rule.facts[0]].value == False and facts[rule.facts[1]].value == False:
changed.append(rule.facts[0])
changed.append(rule.facts[1])
facts[rule.facts[0]].value = None
facts[rule.facts[1]].value = None
elif facts[rule.facts[0]].value == False:
changed.append(rule.facts[0])
facts[rule.facts[0]].value = True
elif facts[rule.facts[1]].value == False:
changed.append(rule.facts[1])
facts[rule.facts[1]].value = True
else:
print("Your rules are inconsistent")
exit(1)
elif right_value is None and left_value == False:
if len(rule.operations) == 1 or (len(rule.operations) == 2 and rule.operations[0] == '!'):
changed.append(rule.facts[1])
facts[rule.facts[1]].value = True
elif left_value is None and right_value == False:
if len(rule.operations) == 1 or (len(rule.operations) == 2 and rule.operations[1] == '!'):
changed.append(rule.facts[0])
facts[rule.facts[0]].value = True
elif value == False:
if right_value == True and left_value == True:
if facts[rule.facts[0]].value == False and facts[rule.facts[1]].value == False:
changed.append(rule.facts[0])
changed.append(rule.facts[1])
facts[rule.facts[0]].value = None
facts[rule.facts[1]].value = None
else:
print("Your rules are inconsistent")
exit(1)
elif right_value is None and left_value == False:
if (len(rule.operations) == 2 and rule.operations[1] == '!') or (len(rule.operations) == 3 and rule.operations[2] == '!'):
changed.append(rule.facts[1])
facts[rule.facts[1]].value = True
elif left_value is None and right_value == False:
if (len(rule.operations) == 2 and rule.operations[0] == '!') or (len(rule.operations) == 3 and rule.operations[0] == '!'):
changed.append(rule.facts[0])
facts[rule.facts[0]].value = True
elif right_value == False and left_value == True and facts[rule.facts[0]].value == False:
changed.append(rule.facts[0])
facts[rule.facts[0]].value = True
elif left_value == False and right_value == True and facts[rule.facts[1]].value == False:
changed.append(rule.facts[1])
facts[rule.facts[1]].value = True
elif left_value is None and right_value is None and len(rule.operations) == 3:
changed.append(rule.facts[0])
changed.append(rule.facts[1])
facts[rule.facts[0]].value = True
facts[rule.facts[1]].value = True
else:
print("Error")
exit(1)
return changed
def evaluate_rule(rule):
temp = rule[:]
for i in range(len(temp)):
if temp[i] in letters:
temp[i] = facts[temp[i]].value
'''temp = []
i, j, fact = 0, 0, True
while j < len(rule.operations) or i < len(rule.facts):
if fact:
if j < len(rule.operations) and rule.operations[j] == '!':
if type(rule.facts[i]) is str:
temp += [rule.operations[j], facts[rule.facts[i]].value]
else:
temp += [rule.operations[j], evaluate_rule(rule.facts[i])]
i += 1
j += 1
else:
temp.append(facts[rule.facts[i]].value)
i += 1
fact = False
else:
temp.append(rule.operations[j])
j += 1'''
while '!' in temp:
i = temp.index('!')
if temp[i + 1] == None:
temp = temp[:i] + [None] + temp[i + 1:]
else:
temp = temp[:i] + [not temp[i + 1]] + temp[i + 1:]
while '+' in temp:
i = temp.index('+')
if temp[i - 1] == None:
if temp[i + 1] == False:
temp = temp[:i - 1] + [False] + temp[i + 1:]
else:
temp = temp[:i - 1] + [None] + temp[i + 1:]
elif temp[i + 1] == None:
if temp[i - 1] == False:
temp = temp[:i - 1] + [False] + temp[i + 1:]
else:
temp = temp[:i - 1] + [None] + temp[i + 1:]
else:
temp = temp[:i - 1] + [temp[i - 1] and temp[i + 1]] + temp[i + 1:]
while '|' in temp:
i = temp.index('|')
if temp[i - 1] == None:
if temp[i + 1] == True:
temp = temp[:i - 1] + [True] + temp[i + 1:]
else:
temp = temp[:i - 1] + [None] + temp[i + 1:]
elif temp[i + 1] == None:
if temp[i - 1] == True:
temp = temp[:i - 1] + [True] + temp[i + 1:]
else:
temp = temp[:i - 1] + [None] + temp[i + 1:]
else:
temp = temp[:i - 1] + [temp[i - 1] or temp[i + 1]] + temp[i + 1:]
while '^' in temp:
i = temp.index('^')
if temp[i - 1] == None or temp[i + 1] == None:
temp = temp[:i - 1] + [None] + temp[i + 1:]
else:
temp = temp[:i - 1] + [temp[i - 1] ^ temp[i + 1]] + temp[i + 1:]
return temp[0]
def check_rule(rule):
if (rule.operations.count('=>') + rule.operations.count('<=>')) != 1:
print('Rule syntax error!')
exit(1)
left, right = get_rule_parts(rule)
if rule.operations.count('=>') == 1:
return apply_rule(right, evaluate_rule(left))
else:
right_res = evaluate_rule(right)
left_res = evaluate_rule(left)
if (left_res == True and right_res == False) or (left_res == True and right_res == None):
return apply_rule(right, True)
elif right_res == True and left_res == False or (right_res == True and left_res == None):
return apply_rule(left, True)
elif left_res == None and right_res == False:
return apply_rule(right, None)
elif right_res == None and left_res == False:
return apply_rule(left, None)
return []
def evaluate(fact):
changed_facts = []
for rule in facts[fact].rules:
changed_facts += check_rule(rule)
for fact in changed_facts:
evaluate(fact)
return len(changed_facts) > 0
def parse_line(line):
if line[0] == '=':
for char in line[1:]:
if char in letters:
facts[char].value = True
elif char == '#':
break
else:
return False
elif line[0] == '?':
for char in line[1:]:
if char in letters:
queries.append(char)
elif char == '#':
break
else:
return False
else:
rule = parse_rule(line, facts)
'''rule = Rule()
a = Fact('A')
b = Fact('B')
rule.facts = ['A', 'B']
rule.operations = ['=>']
facts['A'] = a
facts['B'] = b
a.rules.append(rule)
b.rules.append(rule)
for fact in rule.facts:
if type(fact) is str:
facts[fact].rules.append(rule)'''
return True
def main():
if len(argv) != 2:
print('Usage: python main.py <filename>')
else:
try:
f = open(argv[1], 'r')
for line in f:
temp = line.strip()
if temp == '' or temp[0] == '#':
continue
if parse_line(temp) is None:
print('Syntax error!')
exit(1)
for key in facts:
if facts[key].value == True:
if evaluate(key):
break
for query in queries:
if query in facts:
print('{}: {}'.format(query, facts[query].value if facts[query].value is not None else 'undefined'))
else:
print('{}: False'.format(query))
except IOError:
print("File not found")
# except:
# print("Error")
if __name__ == '__main__':
main()