From cf4e59c9d6bce337514fc7d77120baced0d6d7bc Mon Sep 17 00:00:00 2001
From: Timotej Lazar <timotej.lazar@fri.uni-lj.si>
Date: Thu, 17 Mar 2016 14:19:45 +0100
Subject: Prolog: split lists exercises into two groups

---
 prolog/problems/lists_advanced/len_2/common.py | 49 ++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 prolog/problems/lists_advanced/len_2/common.py

(limited to 'prolog/problems/lists_advanced/len_2/common.py')

diff --git a/prolog/problems/lists_advanced/len_2/common.py b/prolog/problems/lists_advanced/len_2/common.py
new file mode 100644
index 0000000..93a1faa
--- /dev/null
+++ b/prolog/problems/lists_advanced/len_2/common.py
@@ -0,0 +1,49 @@
+# coding=utf-8
+
+from operator import itemgetter
+import prolog.engine
+import server.problems
+
+id = 119
+number = 26
+visible = False
+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
+    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 []
-- 
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