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# coding=utf-8
from operator import itemgetter
import socket
import prolog.engine
import prolog.util
from server.hints import Hint
import server.problems
id = 181
number = 2
visible = True
facts = 'family_relations'
solution = '''\
father(X, Y) :-
parent(X, Y),
male(X).
'''
hint_type = {
'or_instead_of_and': Hint('or_instead_of_and'),
'or_instead_of_and_two_rules': Hint('or_instead_of_and_two_rules'),
'x_must_be_male': Hint('x_must_be_male'),
'x_must_be_parent': Hint('x_must_be_parent'),
'y_can_be_of_any_gender': Hint('y_can_be_of_any_gender'),
'y_need_not_be_parent': Hint('y_need_not_be_parent'),
}
test_cases = [
('father(X, _)',
[{'X': 'aleksander'}, {'X': 'aleksandr'}, {'X': 'andrew'}, {'X': 'frank'},
{'X': 'george'}, {'X': 'jerry'}, {'X': 'john'}, {'X': 'morty'},
{'X': 'patrick'}, {'X': 'thomas'}, {'X': 'william'}]),
('father(_, X)',
[{'X': 'aleksander'}, {'X': 'anna'}, {'X': 'daniela'}, {'X': 'george'},
{'X': 'jeffrey'}, {'X': 'jerry'}, {'X': 'joanne'}, {'X': 'kramer'},
{'X': 'luana'}, {'X': 'michael'}, {'X': 'michelle'}, {'X': 'patricia'},
{'X': 'sally'}, {'X': 'susan'}, {'X': 'vanessa'}, {'X': 'william'}]),
('father(X, aleksander)',
[{'X': 'aleksandr'}]),
]
def test(program, solved_problems):
code = (program + '\n' +
server.problems.solutions_for_problems('prolog', solved_problems) + '\n' +
server.problems.load_facts('prolog', facts).facts)
n_correct = 0
engine_id = None
try:
engine_id, output = prolog.engine.create(code=code, timeout=1.0)
if engine_id is not None and 'error' not in map(itemgetter(0), output):
# Engine successfully created, and no syntax error in program.
for query, answers in test_cases:
# Limit inferences for each solution to curb unbounded recursion.
limited = 'call_with_inference_limit(({}), 100000, _)'.format(query)
if prolog.engine.check_answers(engine_id, query=limited, answers=answers, timeout=1.0):
n_correct += 1
finally:
if engine_id:
prolog.engine.destroy(engine_id)
passed = n_correct == len(test_cases)
hints = [{'id': 'test_results', 'args': {'passed': n_correct, 'total': len(test_cases)}}]
return passed, hints
def hint(program, solved_problems):
tokens = prolog.util.tokenize(program)
code = (program + '\n' +
server.problems.solutions_for_problems('prolog', solved_problems) + '\n' +
server.problems.load_facts('prolog', facts).facts)
try:
engine_id, output = prolog.engine.create(code=code, timeout=1.0)
# OR (;) instead of AND (,)
# this hint has to be before the next two
# as otherwise those two would always override it
# and not convey the same (amount of) help/information
# warning: due to speed considerations this (48) is knowledge base dependent
# independent: findall(_, (parent(X, Y) ; male(X)), L2)
if prolog.util.Token('SEMI', ';') in tokens and prolog.engine.ask_truth(engine_id,
'findall(_, father(X, Y), L), length(L, 48)'):
return [{'id': 'or_instead_of_and'}]
# OR instead of AND written with two rules, namely:
# (r1) father(X, Y):- male(X). (r2) father(X, Y):- parent(X, Y).
if prolog.engine.ask_truth(engine_id,
'findall(_, father(X, Y), L), length(L, 48)'):
return [{'id': 'or_instead_of_and_two_rules'}]
# X must be male
if prolog.engine.ask_truth(engine_id, 'female(X), father(X, _)'):
return [{'id': 'x_must_be_male'}]
# X must be a parent
if prolog.engine.ask_truth(engine_id,
'father(X, _), \+ parent(X, _)'):
return [{'id': 'x_must_be_parent'}]
# Y can be of any gender, incl. female
if prolog.engine.ask_one(engine_id,
'father(_, Y), female(Y)') == 'false':
return [{'id': 'y_can_be_of_any_gender'}]
# Y does not necessarily need to be a parent
if prolog.engine.ask_one(engine_id,
'father(_, Y), \+ parent(Y, _)') == 'false':
return [{'id': 'y_need_not_be_parent'}]
except socket.timeout as ex:
pass
finally:
if engine_id:
prolog.engine.destroy(engine_id)
return None
|
