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# coding=utf-8
from operator import itemgetter
import prolog.engine
import server.problems
id = 119
number = 26
visible = True
facts = None
solution = '''\
len([], 0).
len([_|T], Len) :-
len(T, LenT),
Len is LenT + 1.
'''
test_cases = [
('len([8,3,5,1], X)',
[{'X': '4'}]),
('len([2,-3,5,0,3], X)',
[{'X': '5'}]),
('len([], X)',
[{'X': '0'}]),
]
def test(program, solved_problems):
code = (program + '\n' +
server.problems.solutions_for_problems('prolog', solved_problems))
engine_id = None
try:
engine_id, output = prolog.engine.create(code=code, timeout=1.0)
if not engine_id or 'error' in map(itemgetter(0), output):
# Engine creation failed, or syntax error in code.
return 0, len(test_cases)
n_correct = 0
for query, answers in test_cases:
# Limit inferences for each solution to curb unbounded recursion.
limited = 'call_with_inference_limit(({}), 100000, _)'.format(query)
if prolog.engine.check_answers(engine_id, query=limited, answers=answers, timeout=1.0):
n_correct += 1
finally:
if engine_id:
prolog.engine.destroy(engine_id)
passed = n_correct == len(test_cases)
hints = [{'id': 'test_results', 'args': {'passed': n_correct, 'total': len(test_cases)}}]
return passed, hints
def hint(program, solved_problems):
# TODO
return []
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