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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 = 94
group = 'family_relations'
number = 1
visible = True
facts = 'family_relations'
solution = '''\
mother(X, Y) :-
parent(X, Y),
female(X).
'''
hint_type = {
'general_hint': HintSequence('general_hint', 3),
'or_instead_of_and': Hint('or_instead_of_and'),
'x_must_be_female': Hint('x_must_be_female'),
'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'),
}
def test(program, solved_problems):
# 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.solutions_for_problems('prolog', solved_problems) + '\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(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)
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.')
# 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
if prolog.util.Token('SEMI', ';') in tokens and prolog.engine.ask_truth(engine_id,
'findall(_, mother(X, Y), L1), length(L1, N), \
findall(_, (parent(X, Y) ; female(X)), L2), length(L2, N)'):
return [{'id': 'or_instead_of_and'}]
# X must be female
if prolog.engine.ask_truth(engine_id, 'male(X), mother(X, _)'):
return [{'id': 'x_must_be_female'}]
# X must be a parent
if prolog.engine.ask_truth(engine_id,
'mother(X, _), \+ parent(X, _)'):
return [{'id': 'x_must_be_parent'}]
# Y can be of any gender, incl. male
if prolog.engine.ask_one(engine_id,
'mother(_, Y), male(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,
'mother(_, 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
|
