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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 = 97
number = 5
visible = True
facts = 'family_relations'
solution = '''\
brother(X, Y) :-
parent(P, X),
parent(P, Y),
male(X),
X \== Y.
'''
hint_type = {
'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'),
'neq_used_too_early': Hint('neq_used_too_early'),
'neq+_instead_of_neq': Hint('neq+_instead_of_neq'),
'predicate_always_false': Hint('predicate_always_false'),
}
test_cases = [
('brother(X, _)',
[{'X': 'alessandro'}, {'X': 'andrew'}, {'X': 'jeffrey'},
{'X': 'kramer'}, {'X': 'michael'}, {'X': 'william'}]),
('brother(andrew, X)',
[{'X': 'melanie'}]),
('brother(X, sally)',
[{'X': 'jeffrey'}, {'X': 'william'}]),
]
def test(code, aux_code):
n_correct = 0
engine_id = None
try:
engine_id, output = prolog.engine.create(code=code+aux_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:
if prolog.engine.check_answers(engine_id, query=query, answers=answers, timeout=1.0):
n_correct += 1
except socket.timeout:
pass
finally:
if engine_id:
prolog.engine.destroy(engine_id)
hints = [{'id': 'test_results', 'args': {'passed': n_correct, 'total': len(test_cases)}}]
return n_correct, len(test_cases), hints
def hint(code, aux_code):
tokens = prolog.util.tokenize(code)
try:
engine_id, output = prolog.engine.create(code=code+aux_code, timeout=1.0)
# use of \= or =\= instead of \==
if prolog.util.Token('NEQU', '\=') in tokens or prolog.util.Token('NEQA', '=\=') in tokens:
return [{'id': 'neq+_instead_of_neq'}]
# target predicate seems to always be false
if not prolog.engine.ask_truth(engine_id, 'brother(_, _)'):
return [{'id': 'predicate_always_false'}]
# 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_truth(engine_id, 'brother(_, Y)') and \
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
if prolog.util.Token('NEQ', '\==') not in tokens and prolog.engine.ask_truth(engine_id,
'setof(X, (member(X, [william, alessandro, andrew]), brother(X, X)), L), length(L, 3)'):
return [{'id': 'x_y_must_be_different'}]
# X and Y must be different, but \== was used
if prolog.util.Token('NEQ', '\==') in tokens and prolog.engine.ask_truth(engine_id,
'setof(X/Y, brother(X, Y), L), member(alessandro/alessandro, L), member(andrew/andrew, L), member(william/william, L)'):
return [{'id': 'neq_used_too_early'}]
except socket.timeout as ex:
pass
finally:
if engine_id:
prolog.engine.destroy(engine_id)
return []
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