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# coding=utf-8
import socket
import prolog.engine
import prolog.util
from server.hints import Hint, HintSequence
import server.problems
id = 97
group = 'family_relations'
number = 4
visible = True
facts = 'family_relations'
solution = '''\
brother(X, Y) :-
parent(P, X),
parent(P, Y),
male(X),
X \== Y.
'''
hint_typs = {
'general_hint': HintSequence('general_hint', 3),
'x_must_be_male': Hint('x_must_be_male'),
'common_parent_needed': Hint('common_parent_needed'),
'Y_can_be_of_any_gender': Hint('Y_can_be_of_any_gender'),
'x_y_must_be_different': Hint('x_y_must_be_different'),
}
def test(session, program):
# TODO: change queries and answers (these are for sister/2)
# Test queries and expected answers (values of X).
queries = [
('sister(melanie, X)', set(['andrew'])),
('sister(X, andrew)', set(['melanie'])),
('sister(X, _)', set(['michelle', 'daniela', 'patricia', 'luana', 'sally', 'melanie', 'nevia', 'vanessa', 'anna'])),
]
code = program + '\n' + server.problems.load_facts('prolog', facts).facts
engine_id = None
try:
engine_id, output = prolog.engine.create(code=code, timeout=1.0)
if not engine_id:
return 0, len(queries)
n_correct = 0
for query, solution in queries:
answers, error = prolog.engine.ask_all(engine_id, query=query, timeout=1.0)
if answers and answers[-1] != 'timed out':
values_x = set([ans.get('X') for ans, constraints in answers])
if values_x == solution:
n_correct += 1
finally:
if engine_id:
prolog.engine.destroy(engine_id)
return n_correct, len(queries)
def hint(session, program):
# tokens = prolog.util.tokenize(program)
code = program + '\n' + server.problems.load_facts('prolog', facts).facts
engine_id = None
try:
engine_id, output = prolog.engine.create(code=code, timeout=1.0)
if not engine_id:
raise Exception('Prolog engine failed to create.')
# X must be male
if prolog.engine.ask_truth(engine_id, 'female(X), brother(X, _)'):
return [{'id': 'x_must_be_male'}]
# X and Y must have a common parent
if prolog.engine.ask_truth(engine_id,
'brother(X, Y), \+ (parent(P, X), parent(P, Y))'):
return [{'id': 'common_parent_needed'}]
# Y can be of any gender, incl. female
if prolog.engine.ask_one(engine_id,
'brother(_, Y), female(Y)') == 'false':
return [{'id': 'Y_can_be_of_any_gender'}]
# X and Y must be different
ans = prolog.engine.ask_one(engine_id,
'setof(X, (member(X, [william, alessandro, andrew]), brother(X, X)), L), length(L, N).')
# TODO this barfs if ans is 'false'
#if ans.get('N') == '3':
# return [{'id': 'x_y_must_be_different'}]
except socket.timeout as ex:
pass
finally:
if engine_id:
prolog.engine.destroy(engine_id)
return None
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