diff options
author | Aleksander Sadikov <aleksander.sadikov@fri.uni-lj.si> | 2016-03-02 15:24:00 +0100 |
---|---|---|
committer | Aleksander Sadikov <aleksander.sadikov@fri.uni-lj.si> | 2016-03-02 15:24:00 +0100 |
commit | d4e24f31ab51640c2e65eb68446f0d5f6174b7e1 (patch) | |
tree | 6fd93eaa6cca34c30ea97a1cee5ef29507b3c442 /prolog/problems/family_relations/ancestor_2/common.py | |
parent | e318ce671052e30dff8077d7ca72f8633cab9ffa (diff) |
Improved hints for ancestor/2 and descendant/2.
Diffstat (limited to 'prolog/problems/family_relations/ancestor_2/common.py')
-rw-r--r-- | prolog/problems/family_relations/ancestor_2/common.py | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/prolog/problems/family_relations/ancestor_2/common.py b/prolog/problems/family_relations/ancestor_2/common.py index 2353eab..a7c491d 100644 --- a/prolog/problems/family_relations/ancestor_2/common.py +++ b/prolog/problems/family_relations/ancestor_2/common.py @@ -31,6 +31,7 @@ hint_type = { 'descendant_need_not_be_parent': Hint('descendant_need_not_be_parent'), 'wrong_direction': Hint('wrong_direction'), 'only_two_levels_deep': Hint('only_two_levels_deep'), + 'predicate_always_false': Hint('predicate_always_false'), 'timeout': Hint('timeout'), } @@ -84,6 +85,10 @@ def hint(code, aux_code): return [{'id': 'grandparent_used_markup', 'start': m[0], 'end': m[1]} for m in marks] + \ [{'id': 'grandparent_used'}] + # target predicate seems to always be false + if not prolog.engine.ask_truthTO(engine_id, 'ancestor(_, _)'): + return [{'id': 'predicate_always_false'}] + # descendant instead of ancestor (wrong direction) # warning: knowledge base dependent if prolog.engine.ask_truthTO(engine_id, |