3 files changed, 70 insertions, 0 deletions
diff --git a/prolog/problems/world_data/all_capitals_1/common.py b/prolog/problems/world_data/all_capitals_1/common.py
new file mode 100644
index 0000000..490c183
--- /dev/null
+++ b/prolog/problems/world_data/all_capitals_1/common.py
@@ -0,0 +1,44 @@
+from operator import itemgetter
+import socket
+import prolog.engine
+import prolog.util
+from server.hints import Hint
+import server.problems
+
+id = 10002
+number = 20
+visible = True
+facts = 'mondial'
+
+solution = '''\
+all_capitals(List) :-
+    findall(Capital, country(_, _, Capital, _, _, _), List).
+'''
+
+hint_type = {
+}
+
+test_cases = [
+    ('all_capitals(X), length(X, L)', [{'L': '244'}]),
+]
+
+def test(code, aux_code):
+    n_correct = 0
+    engine_id = None
+    try:
+        engine_id, output = prolog.engine.create(code=code+aux_code, timeout=5.0)
+        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, inference_limit=None):
+                    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):
+        hints += [{'id': 'final_hint'}]
+    return n_correct, len(test_cases), hints
diff --git a/prolog/problems/world_data/all_capitals_1/en.py b/prolog/problems/world_data/all_capitals_1/en.py
new file mode 100644
index 0000000..92eb2b2
--- /dev/null
+++ b/prolog/problems/world_data/all_capitals_1/en.py
@@ -0,0 +1,13 @@
+name = 'all_capitals/1'
+slug = 'capital cities'
+
+description = '''\
+<p><code>all_capitals(List)</code>: <code>List</code> is a list of all capitals in the world.</p>
+<pre>
+?- all_capitals(List).
+  List = ['Tirana', 'Athina', 'Skopje', 'Beograd', …]
+</pre>
+<p>Useful facts are given as <code>country(Name, ID, Capital, CapitalProvince, Size, Population)</code>.</p>
+'''
+
+hint = {}
diff --git a/prolog/problems/world_data/all_capitals_1/sl.py b/prolog/problems/world_data/all_capitals_1/sl.py
new file mode 100644
index 0000000..cf3413f
--- /dev/null
+++ b/prolog/problems/world_data/all_capitals_1/sl.py
@@ -0,0 +1,13 @@
+name = 'all_capitals/1'
+slug = 'glavna mesta'
+
+description = '''\
+<p><code>all_capitals(List)</code>: <code>List</code> je seznam vseh glavnih mest na svetu.</p>
+<pre>
+?- all_capitals(List).
+  List = ['Tirana', 'Athina', 'Skopje', 'Beograd', …]
+</pre>
+<p>Uporabna dejstva so podana v obliki <code>country(Name, ID, Capital, CapitalProvince, Size, Population)</code>.</p>
+'''
+
+hint = {}