From 49a2f24a813ca250d1c1f31f9799661ff70615ed Mon Sep 17 00:00:00 2001
From: Aleksander Sadikov <aleksander.sadikov@fri.uni-lj.si>
Date: Mon, 29 Feb 2016 00:11:26 +0100
Subject: Additional improvements to hints for mother, father, grandparent,
 sister, and brother problems.

---
 prolog/problems/family_relations/brother_2/common.py     | 13 +++++++++----
 prolog/problems/family_relations/brother_2/sl.py         | 12 +++++++++---
 prolog/problems/family_relations/father_2/sl.py          |  3 ++-
 prolog/problems/family_relations/grandparent_2/common.py | 14 ++++++++++----
 prolog/problems/family_relations/grandparent_2/sl.py     |  6 ++++++
 prolog/problems/family_relations/mother_2/sl.py          |  3 ++-
 prolog/problems/family_relations/sister_2/common.py      | 13 +++++++++----
 prolog/problems/family_relations/sister_2/sl.py          | 12 +++++++++---
 8 files changed, 56 insertions(+), 20 deletions(-)

(limited to 'prolog/problems')

diff --git a/prolog/problems/family_relations/brother_2/common.py b/prolog/problems/family_relations/brother_2/common.py
index 7f61744..0ad74c3 100644
--- a/prolog/problems/family_relations/brother_2/common.py
+++ b/prolog/problems/family_relations/brother_2/common.py
@@ -26,7 +26,8 @@ hint_type = {
     'y_can_be_of_any_gender': Hint('y_can_be_of_any_gender'),
     'x_y_must_be_different': Hint('x_y_must_be_different'),
     'neq_used_too_early': Hint('neq_used_too_early'),
-    'nm_instead_of_neq': Hint('nm_instead_of_neq'),
+    'neq+_instead_of_neq': Hint('neq+_instead_of_neq'),
+    'predicate_always_false': Hint('predicate_always_false'),
 }
 
 test_cases = [
@@ -78,9 +79,13 @@ def hint(code, aux_code):
            prolog.engine.ask_one(engine_id, 'brother(_, Y), female(Y)') == 'false':
             return [{'id': 'y_can_be_of_any_gender'}]
 
-        # use of \= instead of \==
-        if prolog.util.Token('NEQ', '\=') in tokens:
-            return [{'id': 'nm_instead_of_neq'}]
+        # use of \= or =\= instead of \==
+        if prolog.util.Token('NEQU', '\=') in tokens or prolog.util.Token('NEQA', '=\=') in tokens:
+            return [{'id': 'neq+_instead_of_neq'}]
+
+        # target predicate seems to always be false
+        if prolog.engine.ask_one(engine_id, 'brother(_, _)') == 'false':
+            return [{'id': 'predicate_always_false'}]
 
         # X and Y must be different
         if prolog.util.Token('NEQ', '\==') not in tokens and prolog.engine.ask_truth(engine_id,
diff --git a/prolog/problems/family_relations/brother_2/sl.py b/prolog/problems/family_relations/brother_2/sl.py
index f8eba49..ed2d015 100644
--- a/prolog/problems/family_relations/brother_2/sl.py
+++ b/prolog/problems/family_relations/brother_2/sl.py
@@ -46,9 +46,10 @@ Na primer: <code>X \== Y</code></p>
 <p><code>Y</code> je pravzaprav lahko poljubnega spola.</p>
 ''',
 
-    'nm_instead_of_neq': '''\
-<p>Uporabi raje operator \== namesto operatorja \=. Prvi preveri, da dva objekta nista enaka,
-drugi pa ju poskusi unificirati (narediti enaka).</p>
+    'neq+_instead_of_neq': '''\
+<p>Uporabi raje operator \== namesto operatorjev \= ali =\=. Prvi preveri, da oba operanda nista enaka,
+drugi (\=) ju poskusi unificirati (narediti enaka), tretji (=\=) pa je samo za aritmetično primerjanje
+in morata oba operanda biti takoj izračunljiva aritmetična izraza.</p>
 ''',
 
     'common_parent_needed': '''\
@@ -65,4 +66,9 @@ ko naleti na primerjavo.</p>
 <p>Morda pa preprosto preverjaš napačni spremenljivki?</p>
 ''',
 
+    'predicate_always_false': '''\
+<p>Vse kaže, da tvoj predikat vedno vrne "false". Si mu dal pravilno ime, si se morda pri imenu zatipkal?</p>
+<p>Če je ime pravilno, se morda splača preveriti tudi, če se nisi zatipkal kje drugje,
+je morda kakšna pika namesto vejice ali obratno, morda kakšna spremenljivka z malo začetnico?</p>
+''',
 }
diff --git a/prolog/problems/family_relations/father_2/sl.py b/prolog/problems/family_relations/father_2/sl.py
index e399d39..e59e42d 100644
--- a/prolog/problems/family_relations/father_2/sl.py
+++ b/prolog/problems/family_relations/father_2/sl.py
@@ -56,7 +56,8 @@ Pozor: velja eno ALI drugo, ne nujno eno IN drugo!</p>
 ''',
 
     'predicate_always_false': '''\
-<p>Vse kaže, da tvoj predikat vedno vrne "false". Morda se splača preveriti, če si se kje zatipkal,
+<p>Vse kaže, da tvoj predikat vedno vrne "false". Si mu dal pravilno ime, si se morda pri imenu zatipkal?</p>
+<p>Če je ime pravilno, se morda splača preveriti tudi, če se nisi zatipkal kje drugje,
 je morda kakšna pika namesto vejice ali obratno, morda kakšna spremenljivka z malo začetnico?</p>
 ''',
 }
diff --git a/prolog/problems/family_relations/grandparent_2/common.py b/prolog/problems/family_relations/grandparent_2/common.py
index 45273c6..870ceb1 100644
--- a/prolog/problems/family_relations/grandparent_2/common.py
+++ b/prolog/problems/family_relations/grandparent_2/common.py
@@ -27,6 +27,7 @@ hint_type = {
     'x_need_not_have_parent': Hint('x_need_not_have_parent'),
     'y_must_have_parent': Hint('y_must_have_parent'),
     'y_need_not_be_parent': Hint('y_need_not_be_parent'),
+    'predicate_always_false': Hint('predicate_always_false'),
 }
 
 test_cases = [
@@ -120,6 +121,10 @@ def hint(code, aux_code):
            prolog.engine.ask_one(engine_id, 'grandparent(_, Y), \+ parent(Y, _)') == 'false':
             return [{'id': 'y_need_not_be_parent'}]
 
+        # target predicate seems to always be false
+        if prolog.engine.ask_one(engine_id, 'grandparent(_, _)') == 'false':
+            return [{'id': 'predicate_always_false'}]
+
     except socket.timeout as ex:
         pass
 
@@ -131,7 +136,8 @@ def hint(code, aux_code):
 
 # sudo mount -o ro /dev/sdaX /mnt
 # things to discuss with Tim
-#   * can we make predicate_always_false a ghint?
-#     with this in mind: how can we supply/know the correct target name and arity?
-#   * popraviti je potrebno spremni tekst glede na novo lokacijo gumba Namig
-#   * what's the name of \= token? And what of =\= token?
+#   1o can we make predicate_always_false a ghint?
+#      with this in mind: how can we supply/know the correct target name and arity?
+#   2x popraviti je potrebno spremni tekst glede na novo lokacijo gumba Namig
+#   3  what's the name of \= token? And what of =\= token?
+#   4  final hint! This very much improves the user experience, adds knowledge, therefore needs to be implemented now!
diff --git a/prolog/problems/family_relations/grandparent_2/sl.py b/prolog/problems/family_relations/grandparent_2/sl.py
index 2961ffa..549d7cc 100644
--- a/prolog/problems/family_relations/grandparent_2/sl.py
+++ b/prolog/problems/family_relations/grandparent_2/sl.py
@@ -60,5 +60,11 @@ hint = {
 
     'y_need_not_be_parent': '''\
 <p>Vnuk <code>Y</code> pravzaprav ne rabi imeti otrok, da ima dedka ali babico...</p>
+''',
+
+    'predicate_always_false': '''\
+<p>Vse kaže, da tvoj predikat vedno vrne "false". Si mu dal pravilno ime, si se morda pri imenu zatipkal?</p>
+<p>Če je ime pravilno, se morda splača preveriti tudi, če se nisi zatipkal kje drugje,
+je morda kakšna pika namesto vejice ali obratno, morda kakšna spremenljivka z malo začetnico?</p>
 ''',
 }
diff --git a/prolog/problems/family_relations/mother_2/sl.py b/prolog/problems/family_relations/mother_2/sl.py
index 5a98cb6..9656d88 100644
--- a/prolog/problems/family_relations/mother_2/sl.py
+++ b/prolog/problems/family_relations/mother_2/sl.py
@@ -57,7 +57,8 @@ Pozor: velja eno ALI drugo, ne nujno eno IN drugo!</p>
 ''',
 
     'predicate_always_false': '''\
-<p>Vse kaže, da tvoj predikat vedno vrne "false". Morda se splača preveriti, če si se kje zatipkal,
+<p>Vse kaže, da tvoj predikat vedno vrne "false". Si mu dal pravilno ime, si se morda pri imenu zatipkal?</p>
+<p>Če je ime pravilno, se morda splača preveriti tudi, če se nisi zatipkal kje drugje,
 je morda kakšna pika namesto vejice ali obratno, morda kakšna spremenljivka z malo začetnico?</p>
 ''',
 }
diff --git a/prolog/problems/family_relations/sister_2/common.py b/prolog/problems/family_relations/sister_2/common.py
index 1bc9365..1234985 100644
--- a/prolog/problems/family_relations/sister_2/common.py
+++ b/prolog/problems/family_relations/sister_2/common.py
@@ -26,7 +26,8 @@ hint_type = {
     'y_can_be_of_any_gender': Hint('y_can_be_of_any_gender'),
     'x_y_must_be_different': Hint('x_y_must_be_different'),
     'neq_used_too_early': Hint('neq_used_too_early'),
-    'nm_instead_of_neq': Hint('nm_instead_of_neq'),
+    'neq+_instead_of_neq': Hint('neq+_instead_of_neq'),
+    'predicate_always_false': Hint('predicate_always_false'),
 }
 
 test_cases = [
@@ -107,9 +108,13 @@ def hint(code, aux_code):
            prolog.engine.ask_one(engine_id, 'sister(_, Y), male(Y)') == 'false':
             return [{'id': 'y_can_be_of_any_gender'}]
 
-        # use of \= instead of \==
-        if prolog.util.Token('NEQ', '\=') in tokens:
-            return [{'id': 'nm_instead_of_neq'}]
+        # use of \= or =\= instead of \==
+        if prolog.util.Token('NEQU', '\=') in tokens or prolog.util.Token('NEQA', '=\=') in tokens:
+            return [{'id': 'neq+_instead_of_neq'}]
+
+        # target predicate seems to always be false
+        if prolog.engine.ask_one(engine_id, 'sister(_, _)') == 'false':
+            return [{'id': 'predicate_always_false'}]
 
         # X and Y must be different
         # this is the last code-specific hint (when everything else doesn't trigger anymore)
diff --git a/prolog/problems/family_relations/sister_2/sl.py b/prolog/problems/family_relations/sister_2/sl.py
index 5fa9d1c..a1cf5c0 100644
--- a/prolog/problems/family_relations/sister_2/sl.py
+++ b/prolog/problems/family_relations/sister_2/sl.py
@@ -45,9 +45,10 @@ Na primer: <code>X \== Y</code></p>
 <p><code>Y</code> je pravzaprav lahko poljubnega spola.</p>
 ''',
 
-    'nm_instead_of_neq': '''\
-<p>Uporabi raje operator \== namesto operatorja \=. Prvi preveri, da dva objekta nista enaka,
-drugi pa ju poskusi unificirati (narediti enaka).</p>
+    'neq+_instead_of_neq': '''\
+<p>Uporabi raje operator \== namesto operatorjev \= ali =\=. Prvi preveri, da oba operanda nista enaka,
+drugi (\=) ju poskusi unificirati (narediti enaka), tretji (=\=) pa je samo za aritmetično primerjanje
+in morata oba operanda biti takoj izračunljiva aritmetična izraza.</p>
 ''',
 
     'common_parent_needed': '''\
@@ -64,4 +65,9 @@ ko naleti na primerjavo.</p>
 <p>Morda pa preprosto preverjaš napačni spremenljivki?</p>
 ''',
 
+    'predicate_always_false': '''\
+<p>Vse kaže, da tvoj predikat vedno vrne "false". Si mu dal pravilno ime, si se morda pri imenu zatipkal?</p>
+<p>Če je ime pravilno, se morda splača preveriti tudi, če se nisi zatipkal kje drugje,
+je morda kakšna pika namesto vejice ali obratno, morda kakšna spremenljivka z malo začetnico?</p>
+''',
 }
-- 
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