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from operator import itemgetter
import socket
import prolog.engine
import prolog.util
from server.hints import Hint, HintPopup
id = 109
number = 90
visible = True
facts = None
solution = '''\
max([X], X).
max([H|T], Max):-
max(T, Max1),
( H > Max1, Max is H
;
H =< Max1, Max is Max1 ).
'''
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'),
'timeout': Hint('timeout'),
'empty_list_base_case': Hint('empty_list_base_case'),
'list_instead_of_elem_base_case': Hint('list_instead_of_elem_base_case'),
'duplicates_not_covered': Hint('duplicates_not_covered'),
'args_not_instantiated': Hint('args_not_instantiated'),
'unprotected_branch': Hint('unprotected_branch'),
'one_branch_missing': Hint('one_branch_missing'),
}
test_cases = [
('max([15], X)',
[{'X': '15'}]),
('max([22, 13, 81], X)',
[{'X': '81'}]),
('max([42, 42, 42, 42], X)',
[{'X': '42'}]),
('max([-22, -113, -41], X)',
[{'X': '-22'}]),
]
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'}]
# target predicate seems to always be false
if not prolog.engine.ask_truthTO(engine_id, 'max(_, _)'):
return [{'id': 'predicate_always_false'}]
if prolog.engine.ask_truthTO(engine_id, 'max([], _)'):
return [{'id': 'empty_list_base_case'}]
if prolog.engine.ask_truthTO(engine_id, 'max([39], [39])'):
return [{'id': 'list_instead_of_elem_base_case'}]
if prolog.engine.ask_truthTO(engine_id,
'max([1, 3, 9], 9), max([3, 9, 27, 1], 27), \+ max([3, 3, 3], 3)'):
return [{'id': 'duplicates_not_covered'}]
reply, output = prolog.engine.ask(engine_id,
'max([1, 2, 2, 2, 3], 3), max([3, 2, 2, 2, 1], 3)', timeout=1)
if reply.get('code') == 'instantiation_error':
return [{'id': 'args_not_instantiated'}]
# TODO is the ! necessary here?
if prolog.engine.ask_truthTO(engine_id,
'findall(M, max([3, 5, 2, 4, 1], M), L), member(X, L), X < 5, !'):
return [{'id': 'unprotected_branch'}]
if prolog.engine.ask_truthTO(engine_id, '''\
max([1, 2, 3, 4, 5], 5),
\+ max([5, 4, 3, 2, 1], 5)
;
\+ max([1, 2, 3, 4, 5], 5),
max([5, 4, 3, 2, 1], 5)'''):
return [{'id': 'one_branch_missing'}]
# missing/failed base case
if not prolog.engine.ask_truthTO(engine_id, 'max([-45], -45)'):
return [{'id': 'base_case'}]
# base case works, 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, 'max([2, 41, -22], 41)'):
return [{'id': 'recursive_case'}]
except socket.timeout as ex:
return [{'id': 'timeout'}]
finally:
if engine_id:
prolog.engine.destroy(engine_id)
return []
|
