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-rw-r--r--prolog/engine.py29
1 files changed, 17 insertions, 12 deletions
diff --git a/prolog/engine.py b/prolog/engine.py
index eca0826..5258878 100644
--- a/prolog/engine.py
+++ b/prolog/engine.py
@@ -117,17 +117,26 @@ def pretty_vars(data):
# within [timeout] seconds, and fails when it finds any other solution.
def check_answers(engine, query, answers, timeout=10):
seen = []
+ # Return false (only) if there is no expected answer where values of all
+ # specified variables match values in [answer].
+ def check_answer(answer):
+ if not answer:
+ return True
+ bindings, constraints = answer
+ for expected in answers:
+ if all(bindings.get(var) == val for var, val in expected.items()):
+ if expected not in seen:
+ seen.append(expected)
+ return True
+ return False
+
start = time.monotonic()
try:
# Run the query.
reply, output = ask(engine, query, timeout)
answer, error, more = process_answer(reply)
- if answer:
- bindings, constraints = answer
- if bindings not in answers:
- return False
- if bindings not in seen:
- seen.append(bindings)
+ if not check_answer(answer):
+ return False
# Continue while there are more potential answers and time remaining.
while more:
@@ -136,12 +145,8 @@ def check_answers(engine, query, answers, timeout=10):
break
reply, output = next(engine, timeout=real_timeout)
answer, error, more = process_answer(reply)
- if answer:
- bindings, constraints = answer
- if bindings not in answers:
- return False
- if bindings not in seen:
- seen.append(bindings)
+ if not check_answer(answer):
+ return False
except:
pass
return len(seen) == len(answers)