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# coding=utf-8
from operator import itemgetter
import prolog.engine
import server.problems
id = 104
number = 12
visible = True
facts = None
solution = '''\
conc([], L, L).
conc([H|T], L2, [H|L]) :-
conc(T, L2, L).
'''
test_cases = [
('conc([j,b], [l], X)',
[{'X': '[j, b, l]'}]),
('conc([a,r,u,e], [c,f], X)',
[{'X': '[a, r, u, e, c, f]'}]),
('conc(X, [], [g,r])',
[{'X': '[g, r]'}]),
('conc([], [], [])',
[{}]),
]
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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