From 16a5005880a75537ba7450d07512d27cca05fbf3 Mon Sep 17 00:00:00 2001
From: Aleksander Sadikov <aleksander.sadikov@fri.uni-lj.si>
Date: Tue, 8 Mar 2016 03:15:54 +0100
Subject: Hints for memb/2 added.

---
 prolog/problems/lists/memb_2/common.py | 39 +++++++++++++++++++++++++++++++++-
 1 file changed, 38 insertions(+), 1 deletion(-)

(limited to 'prolog/problems/lists/memb_2/common.py')

diff --git a/prolog/problems/lists/memb_2/common.py b/prolog/problems/lists/memb_2/common.py
index c3f4dde..9ac56f6 100644
--- a/prolog/problems/lists/memb_2/common.py
+++ b/prolog/problems/lists/memb_2/common.py
@@ -2,6 +2,9 @@
 
 from operator import itemgetter
 import prolog.engine
+import prolog.util
+import socket
+from server.hints import Hint, HintPopup
 import server.problems
 
 id = 103
@@ -15,6 +18,13 @@ memb(X, [_|T]) :-
   memb(X, T).
 '''
 
+hint_type = {
+    'eq_instead_of_equ_markup': HintPopup('eq_instead_of_equ_markup'),
+    'eq_instead_of_equ': Hint('eq_instead_of_equ'),
+    'predicate_always_false': Hint('predicate_always_false'),
+    'final_hint': Hint('final_hint'),
+}
+
 test_cases = [
     ('memb(c, [X])',
         [{'X': 'c'}]),
@@ -39,8 +49,35 @@ def test(code, aux_code):
             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
 
 def hint(code, aux_code):
-    # TODO
+    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('EQ', '==')]
+        marks = [(t.pos, t.pos + len(t.val)) for t in tokens if t in targets]
+        if marks:
+            return [{'id': 'eq_instead_of_equ_markup', 'start': m[0], 'end': m[1]} for m in marks] + \
+                   [{'id': 'eq_instead_of_equ'}]
+
+        # target predicate seems to always be false
+        if not prolog.engine.ask_truth(engine_id, 'grandparent(_, _)'):
+            return [{'id': 'predicate_always_false'}]
+
+
+    except socket.timeout as ex:
+        pass
+
+    finally:
+        if engine_id:
+            prolog.engine.destroy(engine_id)
+
     return []
+
-- 
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