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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(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
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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