1 files changed, 52 insertions, 0 deletions
diff --git a/prolog/problems/lists_advanced/rev_2/common.py b/prolog/problems/lists_advanced/rev_2/common.py
new file mode 100644
index 0000000..408389a
--- /dev/null
+++ b/prolog/problems/lists_advanced/rev_2/common.py
@@ -0,0 +1,52 @@
+# coding=utf-8
+
+from operator import itemgetter
+import prolog.engine
+import server.problems
+
+id = 111
+number = 18
+visible = False
+facts = None
+
+solution = '''\
+conc111([], L, L).
+conc111([H|T], L2, [H|L]) :-
+  conc111(T, L2, L).
+rev([], []).
+rev([H|T], R):-
+  rev(T, R1),
+  conc111(R1, [H], R).
+'''
+
+test_cases = [
+    ('rev([], X)',
+        [{'X': '[]'}]),
+    ('rev([s, k, c, d, d], X)',
+        [{'X': '[d, d, c, k, s]'}]),
+    ('rev(X, [s, k, c, d, d])',
+        [{'X': '[d, d, c, k, s]'}]),
+]
+
+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)}}]
+    return n_correct, len(test_cases), hints
+
+def hint(code, aux_code):
+    # TODO
+    return []