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# coding=utf-8
from operator import itemgetter
import socket
import prolog.engine
import prolog.util
from server.hints import Hint, HintPopup
import server.problems
id = 101
number = 9
visible = True
facts = 'family_relations'
solution = '''\
descendant(X, Y) :-
parent(Y, X).
descendant(X, Y) :-
parent(Y, Z),
descendant(X, Z).
'''
hint_type = {
'gender_is_irrelevant_markup': HintPopup('gender_is_irrelevant_markup'),
'gender_is_irrelevant': Hint('gender_is_irrelevant'),
'grandparent_used': Hint('grandparent_used'),
'grandparent_used_markup': HintPopup('grandparent_used_markup'),
'base_case': Hint('base_case'),
'descendant_of_oneself': Hint('ancestor_to_oneself'),
'descendant_of_oneself_with_or': Hint('descendant_of_oneself_with_or'),
'descendant_need_not_be_parent': Hint('descendant_need_not_be_parent'),
'wrong_direction': Hint('wrong_direction'),
'timeout': Hint('timeout'),
'final_hint': Hint('final_hint'),
}
test_cases = [
('descendant(anna, X)',
[{'X': 'jerry'}, {'X': 'elaine'}, {'X': 'morty'}, {'X': 'helen'}]),
('descendant(daniela, X)',
[{'X': 'nevia'}, {'X': 'aleksander'}, {'X': 'margaret'}, {'X': 'ana'}, {'X': 'aleksandr'}]),
('descendant(X, william)',
[{'X': 'vanessa'}, {'X': 'patricia'}, {'X': 'susan'}, {'X': 'john'}, {'X': 'michael'}, {'X': 'michelle'}]),
]
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)}}]
if n_correct == len(test_cases):
tokens = prolog.util.tokenize(code)
if prolog.util.Token('NAME', 'ancestor') not in tokens:
hints += [{'id': 'final_hint'}]
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)
# gender testing is redundant
# this is not necessarily wrong, but worth mentioning anyway
targets = [prolog.util.Token('NAME', 'male'), prolog.util.Token('NAME', 'female')]
marks = [(t.pos, t.pos + len(t.val)) for t in tokens if t in targets]
if marks:
return [{'id': 'gender_is_irrelevant_markup', 'start': m[0], 'end': m[1]} for m in marks] + \
[{'id': 'gender_is_irrelevant'}]
# grandparent is a sign of complications
# it's likely used instead of recursion
targets = [prolog.util.Token('NAME', 'grandparent')]
marks = [(t.pos, t.pos + len(t.val)) for t in tokens if t in targets]
if marks:
return [{'id': 'grandparent_used_markup', 'start': m[0], 'end': m[1]} for m in marks] + \
[{'id': 'grandparent_used'}]
# ancestor instead of descendant (wrong direction)
# warning: knowledge base dependent
if prolog.engine.ask_truthTO(engine_id,
'findall(_, descendant(william, X), L1), length(L1, 6), \
findall(_, descendant(X, william), L2), length(L2, 2)'):
return [{'id': 'wrong_direction'}]
# missing/failed base case
if prolog.engine.ask_truthTO(engine_id,
'parent(Y, X), \+ descendant(X, Y)'):
return [{'id': 'base_case'}]
# descendant of oneself
if prolog.engine.ask_truthTO(engine_id, 'descendant(X, X)'):
if prolog.util.Token('SEMI', ';') in tokens:
return [{'id': 'descendant_of_oneself_with_or'}]
else:
return [{'id': 'descendant_of_oneself'}]
# X does not necessarily need to be a parent
if prolog.engine.ask_one(engine_id,
'descendant(X, _), \+ parent(X, _)') == 'false':
return [{'id': 'descendant_need_not_be_parent'}]
except socket.timeout as ex:
return [{'id': 'timeout'}]
finally:
if engine_id:
prolog.engine.destroy(engine_id)
return None
|
