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# coding=utf-8
from operator import itemgetter
import prolog.engine
import prolog.util
import socket
from server.hints import Hint, HintPopup
import server.problems
id = 107
number = 8
visible = True
facts = None
solution = '''\
del107(X, [X|T], T).
del107(X, [Y|T], [Y|L]) :-
del107(X, T, L).
permute([], []).
permute(L, [X|P]) :-
del107(X, L, L1),
permute(L1, P).
'''
hint_type = {
'eq_instead_of_equ_markup': HintPopup('eq_instead_of_equ_markup'),
'eq_instead_of_equ': Hint('eq_instead_of_equ'),
'predicate_always_false': Hint('predicate_always_false'),
'base_case': Hint('base_case'),
'recursive_case': Hint('recursive_case'),
'no_insert_or_delete': Hint('no_insert_or_delete'),
'timeout': Hint('timeout'),
'base_case_arbitrary': Hint('base_case_arbitrary'),
'unsuccessful_conc_use': Hint('unsuccessful_conc_use'),
'forcing_result_onto_recursion': Hint('forcing_result_onto_recursion'),
}
test_cases = [
('permute([], X)',
[{'X': '[]'}]),
('permute([a, i, o, e], [i, X, o, e])',
[{'X': 'a'}]),
('setof(L, permute([e, b, l], L), X)',
[{'X': '[[b, e, l], [b, l, e], [e, b, l], [e, l, b], [l, b, e], [l, e, b]]'}]),
]
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)
# strict equality testing instead of simple matching
# this is usually (but not necessarily) wrong
targets = [prolog.util.Token('EQ', '==')]
marks = [(t.pos, t.pos + len(t.val)) for t in tokens if t in targets]
if marks:
return [{'id': 'eq_instead_of_equ_markup', 'start': m[0], 'end': m[1]} for m in marks] + \
[{'id': 'eq_instead_of_equ'}]
# general unsuccessful use of conc (not appropriate for this exercise)
if prolog.util.Token('NAME', 'conc') in tokens:
return [{'id': 'unsuccessful_conc_use'}]
# recursion is getting bigger and bigger
# forcing result onto recursion; case of divide(T, [H1|L1], [H2|L2])
if not prolog.engine.ask_truthTO(engine_id, 'permute([a,b,c], _)') and \
prolog.engine.ask_truthTO(engine_id,
'asserta( permute([cob], [yowza,cob]) ), permute([yowza,cob], [cob]), retract( permute([cob], [yowza,cob]) )'):
return [{'id': 'forcing_result_onto_recursion'}]
# base case succeeds with arbitrary result
if prolog.engine.ask_truthTO(engine_id, 'permute([], P), var(P)'):
return [{'id': 'base_case_arbitrary'}]
# missing/failed base case
if not prolog.engine.ask_truth(engine_id, 'permute([], [])'):
return [{'id': 'base_case'}]
# # target predicate seems to always be false
# if not prolog.engine.ask_truthTO(engine_id, 'divide([_,_,_,_,_], _, _)') and \
# not prolog.engine.ask_truthTO(engine_id, 'divide([_,_,_,_,_,_], _, _)'):
# return [{'id': 'predicate_always_false'}]
# base cases work, the recursive doesn't (but it doesn't timeout)
# this may be left as the last, most generic hint
if not prolog.engine.ask_truth(engine_id, 'permute([qa,qb], [qb,qa])'):
if prolog.util.Token('NAME', 'insert') in tokens or prolog.util.Token('NAME', 'del') in tokens:
return [{'id': 'recursive_case'}]
else:
return [{'id': 'no_insert_or_delete'}]
except socket.timeout as ex:
return [{'id': 'timeout'}]
finally:
if engine_id:
prolog.engine.destroy(engine_id)
return []
|
