diff options
Diffstat (limited to 'prolog/problems/family_relations/descendant_2/common.py')
| -rw-r--r-- | prolog/problems/family_relations/descendant_2/common.py | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/prolog/problems/family_relations/descendant_2/common.py b/prolog/problems/family_relations/descendant_2/common.py index b4d8f31..6cfe1cd 100644 --- a/prolog/problems/family_relations/descendant_2/common.py +++ b/prolog/problems/family_relations/descendant_2/common.py @@ -30,6 +30,7 @@ hint_type = { 'descendant_of_oneself_with_or': Hint('descendant_of_oneself_with_or'), 'descendant_need_not_be_parent': Hint('descendant_need_not_be_parent'), 'wrong_direction': Hint('wrong_direction'), + 'predicate_always_false': Hint('predicate_always_false'), 'timeout': Hint('timeout'), 'final_hint': Hint('final_hint'), } @@ -88,6 +89,10 @@ 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, 'descendant(_, _)'): + return [{'id': 'predicate_always_false'}] + # ancestor instead of descendant (wrong direction) # warning: knowledge base dependent if prolog.engine.ask_truthTO(engine_id, |