From 3cfb316886bafb00e1d12b7364892366497f0c16 Mon Sep 17 00:00:00 2001
From: Timotej Lazar <timotej.lazar@fri.uni-lj.si>
Date: Sun, 20 Mar 2016 11:11:56 +0100
Subject: Prolog: add triggers for rev hints

---
 prolog/problems/lists_advanced/rev_2/common.py | 36 ++++++++++++++++++++++++++
 prolog/problems/lists_advanced/rev_2/sl.py     | 28 ++++++++++++++++++++
 2 files changed, 64 insertions(+)

diff --git a/prolog/problems/lists_advanced/rev_2/common.py b/prolog/problems/lists_advanced/rev_2/common.py
index d9becb6..ee8c9ac 100644
--- a/prolog/problems/lists_advanced/rev_2/common.py
+++ b/prolog/problems/lists_advanced/rev_2/common.py
@@ -27,6 +27,13 @@ hint_type = {
     'base_case': Hint('base_case'),
     'recursive_case': Hint('recursive_case'),
     'timeout': Hint('timeout'),
+    'invalid_insert_at_end': Hint('invalid_insert_at_end'),
+    'base_case_at_len1': Hint('base_case_at_len1'),
+    'arbitrary_base_case': Hint('arbitrary_base_case'),
+    'forcing_result_onto_recursion': Hint('forcing_result_onto_recursion'),
+    'using_other_solutions': Hint('using_other_solutions'),
+    'insertion_at_beginning': Hint('insertion_at_beginning'),
+    'conc_arg_not_list': Hint('conc_arg_not_list'),
 }
 
 test_cases = [
@@ -71,6 +78,35 @@ def hint(code, aux_code):
             return [{'id': 'eq_instead_of_equ_markup', 'start': m[0], 'end': m[1]} for m in marks] + \
                    [{'id': 'eq_instead_of_equ'}]
 
+        if prolog.engine.ask_truthTO(engine_id, 'rev([q], [q]), \+ rev([], [])'):
+            return [{'id': 'base_case_at_len1'}]
+
+        if prolog.engine.ask_truthTO(engine_id, 'rev([], kokos(1))'):
+            return [{'id': 'arbitrary_base_case'}]
+
+        if prolog.engine.ask_truthTO(engine_id,  '''\
+                \+ rev([yowza, brix, cob], R),
+                asserta(rev([brix, cob], [[cob, brix] | yowza])),
+                rev([yowza, brix, cob], [cob, brix]),
+                retract(rev([brix, cob], [[cob, brix] | yowza]))'''):
+            return [{'id': 'forcing_result_onto_recursion'}]
+
+        if any(t.val in ('last', 'shiftleft', 'shiftright') for t in tokens):
+            return [{'id': 'using_other_solutions'}]
+
+        if prolog.engine.ask_truthTO(engine_id, 'rev([qa, qb, qc, qd], [qa, qb, qc, qd])'):
+            return [{'id': 'insertion_at_beginning'}]
+
+        if prolog.engine.ask_truthTO(engine_id, 'rev([a, b, c], [[[[] | c] | b] | a])'):
+            return [{'id': 'invalid_insert_at_end'}]
+
+        if prolog.engine.ask_truthTO(engine_id, '''\
+                \+ rev([yowza, brix, cob], R),
+                asserta(rev([brix, cob], [cob, brix])),
+                rev([yowza, brix, cob], [cob, brix | yowza]),
+                retract(rev([brix, cob], [cob, brix]))'''):
+            return [{'id': 'conc_arg_not_list'}]
+
         # missing/failed base case
         if not prolog.engine.ask_truthTO(engine_id, 'rev([], [])'):
             return [{'id': 'base_case'}]
diff --git a/prolog/problems/lists_advanced/rev_2/sl.py b/prolog/problems/lists_advanced/rev_2/sl.py
index 666832d..806dc52 100644
--- a/prolog/problems/lists_advanced/rev_2/sl.py
+++ b/prolog/problems/lists_advanced/rev_2/sl.py
@@ -43,5 +43,33 @@ da je <code>X</code> hkrati starš in sestra od <code>Y</code> ali kaj podobno z
     'timeout': '''\
 <p>Je morda na delu potencialno neskončna rekurzija? Kako se bo ustavila?</p>
 <p>Morda pa je kriv tudi manjkajoč, neustrezen ali preprosto nekompatibilen (s splošnim primerom) robni pogoj?</p>
+''',
+
+    'base_case_at_len1': '''\
+<p>base_case_at_len1</p>
+''',
+
+    'arbitrary_base_case': '''\
+<p>arbitrary_base_case</p>
+''',
+
+    'forcing_result_onto_recursion': '''\
+<p>forcing_result_onto_recursion</p>
+''',
+
+    'using_other_solutions': '''\
+<p>using_other_solutions</p>
+''',
+
+    'insertion_at_beginning': '''\
+<p>insertion_at_beginning</p>
+''',
+
+    'invalid_insert_at_end': '''\
+<p>invalid_insert_at_end</p>
+''',
+
+    'conc_arg_not_list': '''\
+<p>conc_arg_not_list</p>
 ''',
 }
-- 
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