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# coding=utf-8
from operator import itemgetter
import socket
import prolog.engine
import prolog.util
from server.hints import Hint
import server.problems
id = 96
number = 4
visible = True
facts = 'family_relations'
solution = '''\
sister(X, Y) :-
parent(P, X),
parent(P, Y),
female(X),
X \== Y.
'''
hint_type = {
'x_must_be_female': Hint('x_must_be_female'),
'common_parent_needed': Hint('common_parent_needed'),
'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'),
'neq+_instead_of_neq': Hint('neq+_instead_of_neq'),
'predicate_always_false': Hint('predicate_always_false'),
'final_hint': Hint('final_hint'),
}
test_cases = [
('sister(X, _)',
[{'X': 'anna'}, {'X': 'daniela'}, {'X': 'luana'}, {'X': 'melanie'},
{'X': 'michelle'}, {'X': 'nevia'}, {'X': 'patricia'}, {'X': 'sally'},
{'X': 'vanessa'}]),
('sister(melanie, X)',
[{'X': 'andrew'}]),
('sister(X, andrew)',
[{'X': 'melanie'}]),
]
def test(code, aux_code):
n_correct = 0
engine_id = None
try:
engine_id, output = prolog.engine.create(code=code+aux_code, timeout=1.0)
if engine_id is not None and 'error' not in map(itemgetter(0), output):
# Engine successfully created, and no syntax error in program.
for query, answers in test_cases:
if prolog.engine.check_answers(engine_id, query=query, answers=answers, timeout=1.0):
n_correct += 1
except socket.timeout:
pass
finally:
if engine_id:
prolog.engine.destroy(engine_id)
hints = [{'id': 'test_results', 'args': {'passed': n_correct, 'total': len(test_cases)}}]
if n_correct == len(test_cases):
hints += [{'id': 'final_hint'}]
return n_correct, len(test_cases), hints
def hint(code, aux_code):
# how do I know which general hints were already shown?
# how do I know enough time has elapsed for general hints to be shown?
# how do I know whether the hint button was pressed?
# should we have another hint button which appears in hint window (like more...)
# when a hint is available after testing the current version of the program
# and this button triggers code-specific hints (i.e. non-general ones)
# one way to do hints is to use a hierarchy of hints...
# similar to how some rule-based systems work
# the trigger-testing could be easier that way as well
# what I have in mind is:
# e.g. when I test if X is sister to itself, I've already done other trigger-tests
# and I don't need to do them again
# first general hints (triggered by the hint button)
# do we do it like this? this button triggers general hints only?
# not sure this is ok.. discuss with others (include Janez)
# if hbutton.pressed:
# trigger generalhint(#buttonpress)
# code-specific hints next
# tokenize (and similar) only if *needed* for a given exercise
# to reduce server processor load
tokens = prolog.util.tokenize(code)
try:
engine_id, output = prolog.engine.create(code=code+aux_code, timeout=1.0)
# 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 not prolog.engine.ask_truth(engine_id, 'sister(_, _)'):
return [{'id': 'predicate_always_false'}]
# X must be female
if prolog.engine.ask_truth(engine_id, 'male(X), sister(X, _)'):
return [{'id': 'x_must_be_female'}]
# X and Y must have a common parent
if prolog.engine.ask_truth(engine_id,
'sister(X, Y), \+ (parent(P, X), parent(P, Y))'):
return [{'id': 'common_parent_needed'}]
# Y can be of any gender, incl. male
# as this is after previous hints, by this stage the code probably
# does return some sensible results already
# this is an example of using the ordering of hints for easier trigger checks
if prolog.engine.ask_truth(engine_id, 'sister(_, Y)') and \
prolog.engine.ask_one(engine_id, 'sister(_, Y), male(Y)') == 'false':
return [{'id': 'y_can_be_of_any_gender'}]
# X and Y must be different
# this is the last code-specific hint (when everything else doesn't trigger anymore)
if prolog.util.Token('NEQ', '\==') not in tokens and prolog.engine.ask_truth(engine_id,
'setof(X, (member(X, [sally, nevia, vanessa]), sister(X, X)), L), length(L, 3)'):
return [{'id': 'x_y_must_be_different'}]
# X and Y must be different, but the user used '\=='
# most likely this means that \== was used before X and Y are known
# this is the last code-specific hint (when everything else doesn't trigger anymore)
if prolog.util.Token('NEQ', '\==') in tokens and prolog.engine.ask_truth(engine_id,
'setof(X/Y, sister(X, Y), L), member(nevia/nevia, L), member(sally/sally, L), member(vanessa/vanessa, L)'):
return [{'id': 'neq_used_too_early'}]
# last hints are connected with programming style
# here, this means detecting such code:
# parent(P1, X), parent(P2, Y), P1 == P2 (or P1 = P2)
# I guess program tokens can be used for this
# do we require that the program is correct for this?
# or is it enough that this is after ALL code-specific hints AND it has to trigger?
# regular expressions, anyone?
# QUESTION to discuss:
# where do AI hints come into play?
# only after all code-specific and non stylistic hints are exhausted?
# or randomly before? or?
# QUESTION to discuss:
# I suggest hint triggers (if code-based or also token-based?)
# are used as CLASSES of unit tests
# although.. this makes random counterexamples harder to implement
# (does it?)
except socket.timeout as ex:
pass
finally:
if engine_id:
prolog.engine.destroy(engine_id)
return []
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