diff options
Diffstat (limited to 'prolog/problems/family_relations/descendant_2')
| -rw-r--r-- | prolog/problems/family_relations/descendant_2/common.py | 101 | ||||
| -rw-r--r-- | prolog/problems/family_relations/descendant_2/sl.py | 63 |
2 files changed, 164 insertions, 0 deletions
diff --git a/prolog/problems/family_relations/descendant_2/common.py b/prolog/problems/family_relations/descendant_2/common.py index 53320b3..9032612 100644 --- a/prolog/problems/family_relations/descendant_2/common.py +++ b/prolog/problems/family_relations/descendant_2/common.py @@ -13,3 +13,104 @@ descendant(X, Y) :- parent(Y, Z), descendant(X, Z). ''' + +hint_type = { + 'gender_is_irrelevant': Hint('gender_is_irrelevant'), + 'grandparent_used': Hint('grandparent_used'), + 'base_case': Hint('base_case'), + 'descendant_of_oneself': Hint('ancestor_to_oneself'), + 'descendant_need_not_be_parent': Hint('descendant_need_not_be_parent'), + 'wrong_direction': Hint('wrong_direction'), +} + +test_cases = [ + # TODO +] + +def test(program, solved_problems): + code = (program + '\n' + + server.problems.solutions_for_problems('prolog', solved_problems) + '\n' + + server.problems.load_facts('prolog', facts).facts) + + 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): + tokens = prolog.util.tokenize(program) + + code = (program + '\n' + + server.problems.solutions_for_problems('prolog', solved_problems) + '\n' + + server.problems.load_facts('prolog', facts).facts) + + engine_id = None + try: + engine_id, output = prolog.engine.create(code=code, timeout=1.0) + if not engine_id: + raise Exception('Prolog engine failed to create.') + + # gender testing is redundant + # this is not necessarily wrong, but worth mentioning anyway + targets = [prolog.util.Token('NAME', 'male'), prolog.util.Token('NAME', 'female')] + pos = [(t.pos, t.pos + len(t.val)) for t in tokens if t in targets] + if pos: + # TODO: resolve how highlighting info is communicated + return [{'id': 'gender_is_irrelevant', 'highlight': pos}] + + # grandparent is a sign of complications + # it's likely used instead of recursion + targets = [prolog.util.Token('NAME', 'grandparent')] + pos = [(t.pos, t.pos + len(t.val)) for t in tokens if t in targets] + if pos: + # TODO: resolve how highlighting info is communicated + return [{'id': 'grandparent_used', 'highlight': pos}] + + # missing/failed base case + # TODO: how will ask_truth handle/return timeouts... + # TODO: timeout is the same as fail in this particular case + if prolog.engine.ask_truth(engine_id, + 'parent(Y, X), \+ descendant(X, Y)'): + return [{'id', 'base_case'}] + + # descendant of oneself + if prolog.engine.ask_truth(engine_id, 'descendant(X, X)'): + 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'}] + + # ancestor instead of descendant (wrong direction) + # warning: knowledge base dependent + if prolog.engine.ask_truth(engine_id, + 'findall(_, descendant(william, X), L1), length(L1, 6), \ + findall(_, descendant(X, william), L2), length(L2, 2)'): + return [{'id', 'wrong_direction'}] + + except socket.timeout as ex: + pass + + finally: + if engine_id: + prolog.engine.destroy(engine_id) + + return None + diff --git a/prolog/problems/family_relations/descendant_2/sl.py b/prolog/problems/family_relations/descendant_2/sl.py new file mode 100644 index 0000000..fb60e76 --- /dev/null +++ b/prolog/problems/family_relations/descendant_2/sl.py @@ -0,0 +1,63 @@ +# coding=utf-8 + +id = 101 +name = 'descendant/2' +slug = 'the descendant relation' + +description = '''\ +<p><code>descendant(X, Y)</code>: <code>X</code> is a descendant (child, grandchild,...) of <code>Y</code>.</p> +<pre> + ?- descendant(patricia, X). + X = william ; + X = tina ; + X = thomas. +</pre>''' + +plan = ['''\ +<p>Brez rekurzije ne bo šlo... kako lahko problem prevedem na (en korak) manjši problem?</p> +<p><img src="Descendant-3.png" /></p> +<p>Loni naj zbriše imena relacij (parent, ancestor) s te slike!</p> +''', '''\ +<p><img src="Descendant-3.png" /></p> +''', '''\ +<p>Če je nek <code>Z</code> starš od <code>X</code> in je +ta <code>Z</code> hkrati potomec od <code>Y</code>, +potem je tudi <code>X</code> potomec od <code>Y</code>.</p> +'''] + +hint = { + 'gender_is_irrelevant': '''\ +<p>Je spol res pomemben?</p> +''', + + 'grandparent_used': '''\ +<p>Rešitev z "grandparent" bo premalo splošna, poskusi nadomestiti to z rekurzijo. +Skratka, poskusi prevesti na "manjši" problem, npr. potomec v enem koraku manj +(en korak bližji potomec)...</p> +''', + + 'base_case': '''\ +<p>Si pomislil na robni pogoj? Kaj je najbolj enostaven par (potomec, prednik)?</p> +<p><img src="Descendant-1.png" /></p> +''', + + 'descendant_of_oneself': '''\ +<p>Kako je lahko nekdo potomec samega sebe?</p> +''', + + 'descendant_need_not_be_parent': '''\ +<p>Potomec <code>X</code> pravzaprav ne rabi imeti otrok...</p> +''', + + 'wrong_direction': '''\ +<p>Si morda sprogramiral ravno obratno in zamenjal prednika s potomcem? +<code>X</code> naj bo potomec od <code>Y</code> in ne obratno!</p> +''', + + 'interesting_tidbit': '''\ +<p>Zanimivost: nalogo bi lahko rešil tudi z uporabo rešitve za relacijo "ancestor". +Samo obrni spremenljivki <code>X</code> in <code>Y</code>; +če je <code>X</code> potomec od <code>Y</code>, potem je <code>Y</code> prednik od <code>X</code>.</p> +''', +} + |