def conjunctiveSipStrategy(self, goalsRemaining, factGraph, bindings=None):
"""
Given a conjunctive set of triples, invoke sip-strategy passing
on intermediate solutions to facilitate 'join' behavior
"""
bindings = bindings if bindings else {}
try:
tp = goalsRemaining.next()
assert isinstance(bindings, dict)
dPred = self.derivedPredicateFromTriple(tp)
if dPred is None:
baseEDBQuery = EDBQuery([BuildUnitermFromTuple(tp)],
self.edb,
bindings=bindings)
if self.DEBUG:
print >>sys.stderr,"Evaluating TP against EDB: ",\
baseEDBQuery.asSPARQL()
query, rt = baseEDBQuery.evaluate()
if isinstance(rt, bool) and rt:
yield bindings
elif not isinstance(rt, bool):
rt = list(rt)
remaining_goals = itertools.tee(goalsRemaining, len(rt))
for idx in range(len(rt)):
item = {}
item.update(rt[idx])
item.update(bindings)
if self.DEBUG:
print >> sys.stderr, "Solution from EDB query: ", item
for ansDict in self.conjunctiveSipStrategy(
remaining_goals[idx], factGraph, item):
yield ansDict
else:
queryLit = BuildUnitermFromTuple(tp)
currentOp = GetOp(queryLit)
queryLit.setOperator(currentOp)
query = EDBQuery([queryLit], self.edb, bindings=bindings)
if bindings:
tp = first(query.formulae).toRDFTuple()
if self.DEBUG:
print >> sys.stderr, "Goal/Query: ", query.asSPARQL()
tp = self.hybridPredQueryPreparation(tp)
SetupDDLAndAdornProgram(self.edb,
self.idb, [tp],
derivedPreds=self.derivedPredicates,
ignoreUnboundDPreds=True,
nsBindings=self.nsBindings)
sipCollection = PrepareSipCollection(self.edb.adornedProgram)
if self.DEBUG and sipCollection:
for sip in SIPRepresentation(sipCollection):
print >> sys.stderr, sip
pprint(list(self.edb.adornedProgram), sys.stderr)
elif self.DEBUG:
print >> sys.stderr, "No SIP graph!"
for nextAnswer, ns in self.invokeDecisionProcedure(
tp, factGraph, bindings, self.DEBUG, sipCollection):
if isinstance(nextAnswer, dict):
#Recieved solutions to 'open' query, merge with given bindings
#and continue
for ansDict in self.conjunctiveSipStrategy(
goalsRemaining, factGraph,
mergeMappings1To2(bindings, nextAnswer)):
yield ansDict
elif nextAnswer:
#we (successfully) proved a ground query, pass on bindings
assert isinstance(nextAnswer, bool)
for ansDict in self.conjunctiveSipStrategy(
goalsRemaining, factGraph, bindings):
yield ansDict
except StopIteration:
yield bindings
def sparql_query(self,
queryString,
queryObj,
graph,
dataSetBase,
extensionFunctions,
initBindings={},
initNs={},
DEBUG=False):
"""
The default 'native' SPARQL implementation is based on sparql-p's expansion trees
layered on top of the read-only RDF APIs of the underlying store
"""
from rdflib.sparql.Algebra import TopEvaluate
from rdflib.QueryResult import QueryResult
from rdflib import plugin
from rdflib.sparql.bison.Query import AskQuery
_expr = self.isaBaseQuery(None, queryObj)
if isinstance(queryObj.query,AskQuery) and \
isinstance(_expr,BasicGraphPattern):
#This is a ground, BGP, involving IDB and can be solved directly
#using top-down decision procedure
#First separate out conjunct into EDB and IDB predicates
#(solving the former first)
from FuXi.SPARQL import EDBQuery
groundConjunct = []
derivedConjunct = []
for s, p, o, func in _expr.patterns:
if self.derivedPredicateFromTriple((s, p, o)) is None:
groundConjunct.append(BuildUnitermFromTuple((s, p, o)))
else:
derivedConjunct.append(BuildUnitermFromTuple((s, p, o)))
if groundConjunct:
baseEDBQuery = EDBQuery(groundConjunct, self.edb)
subQuery, ans = baseEDBQuery.evaluate(DEBUG)
assert isinstance(ans, bool), ans
if groundConjunct and not ans:
askResult = False
else:
askResult = True
for derivedLiteral in derivedConjunct:
goal = derivedLiteral.toRDFTuple()
#Solve ground, derived goal directly
goal = self.hybridPredQueryPreparation(goal)
SetupDDLAndAdornProgram(
self.edb,
self.idb, [goal],
derivedPreds=self.derivedPredicates,
ignoreUnboundDPreds=True)
sipCollection = PrepareSipCollection(
self.edb.adornedProgram)
if self.DEBUG and sipCollection:
for sip in SIPRepresentation(sipCollection):
print >> sys.stderr, sip
pprint(list(self.edb.adornedProgram), sys.stderr)
elif self.DEBUG:
print >> sys.stderr, "No SIP graph!"
rt, node = first(
self.invokeDecisionProcedure(goal, self.edb, {},
self.DEBUG,
sipCollection))
if not rt:
askResult = False
break
return plugin.get('SPARQLQueryResult', QueryResult)(askResult)
else:
rt = TopEvaluate(queryObj,
graph,
initBindings,
DEBUG=self.DEBUG,
dataSetBase=dataSetBase,
extensionFunctions=extensionFunctions)
return plugin.get('SPARQLQueryResult', QueryResult)(rt)
def sparql_query(self,
queryString,
queryObj,
graph,
dataSetBase,
extensionFunctions,
initBindings={},
initNs={},
DEBUG=False):
"""
The default 'native' SPARQL implementation is based on sparql-p's expansion trees
layered on top of the read-only RDF APIs of the underlying store
"""
from rdflib.sparql.Algebra import TopEvaluate
from rdflib.QueryResult import QueryResult
from rdflib import plugin
from rdflib.sparql.bison.Query import AskQuery
_expr = self.isaBaseQuery(None,queryObj)
if isinstance(queryObj.query,AskQuery) and \
isinstance(_expr,BasicGraphPattern):
#This is a ground, BGP, involving IDB and can be solved directly
#using top-down decision procedure
#First separate out conjunct into EDB and IDB predicates
#(solving the former first)
from FuXi.SPARQL import EDBQuery
groundConjunct = []
derivedConjunct = []
for s,p,o,func in _expr.patterns:
if self.derivedPredicateFromTriple((s,p,o)) is None:
groundConjunct.append(BuildUnitermFromTuple((s,p,o)))
else:
derivedConjunct.append(BuildUnitermFromTuple((s,p,o)))
if groundConjunct:
baseEDBQuery = EDBQuery(groundConjunct,self.edb)
subQuery,ans = baseEDBQuery.evaluate(DEBUG)
assert isinstance(ans,bool),ans
if groundConjunct and not ans:
askResult = False
else:
askResult = True
for derivedLiteral in derivedConjunct:
goal = derivedLiteral.toRDFTuple()
#Solve ground, derived goal directly
SetupDDLAndAdornProgram(
self.edb,
self.idb,
[goal],
derivedPreds=self.derivedPredicates,
ignoreUnboundDPreds = True,
hybridPreds2Replace=self.hybridPredicates)
if self.hybridPredicates:
lit = BuildUnitermFromTuple(goal)
op = GetOp(lit)
if op in self.hybridPredicates:
lit.setOperator(URIRef(op+u'_derived'))
goal = lit.toRDFTuple()
sipCollection=PrepareSipCollection(self.edb.adornedProgram)
if self.DEBUG and sipCollection:
for sip in SIPRepresentation(sipCollection):
print >>sys.stderr,sip
pprint(list(self.edb.adornedProgram),sys.stderr)
elif self.DEBUG:
print >> sys.stderr, "No SIP graph!"
rt,node = first(self.invokeDecisionProcedure(
goal,
self.edb,
{},
self.DEBUG,
sipCollection))
if not rt:
askResult = False
break
return plugin.get('SPARQLQueryResult',QueryResult)(askResult)
else:
rt = TopEvaluate(queryObj,
graph,
initBindings,
DEBUG=self.DEBUG,
dataSetBase=dataSetBase,
extensionFunctions=extensionFunctions)
return plugin.get('SPARQLQueryResult',QueryResult)(rt)
def invokeRule(priorAnswers,
bodyLiteralIterator,
sip,
otherargs,
priorBooleanGoalSuccess=False,
step=None,
debug=False,
buildProof=False):
"""
Continue invokation of rule using (given) prior answers and list of
remaining body literals (& rule sip). If prior answers is a list,
computation is split disjunctively
[..] By combining the answers to all these subqueries, we generate
answers for the original query involving the rule head
Can also takes a PML step and updates it as it navigates the
top-down proof tree (passing it on and updating it where necessary)
"""
assert not buildProof or step is not None
proofLevel, memoizeMemory, sipCollection, \
factGraph, derivedPreds, processedRules = otherargs
remainingBodyList = [i for i in bodyLiteralIterator]
lazyGenerator = lazyGeneratorPeek(priorAnswers, 2)
if lazyGenerator.successful:
# There are multiple answers in this step, we need to call invokeRule
# recursively for each answer, returning the first positive attempt
success = False
rt = None
_step = None
ansNo = 0
for priorAns in lazyGenerator:
ansNo += 1
try:
if buildProof:
newStep = InferenceStep(step.parent,
step.rule,
source=step.source)
newStep.antecedents = [ant for ant in step.antecedents]
else:
newStep = None
for rt, _step in\
invokeRule([priorAns],
iter([i for i in remainingBodyList]),
sip,
otherargs,
priorBooleanGoalSuccess,
newStep,
debug=debug,
buildProof=buildProof):
if rt:
yield rt, _step
except RuleFailure:
pass
if not success:
# None of prior answers were successful
# indicate termination of rule processing
raise RuleFailure(
"Unable to solve either of %s against remainder of rule: %s" % (
ansNo, remainingBodyList))
# yield False, _InferenceStep(step.parent, step.rule,
# source=step.source)
else:
lazyGenerator = lazyGeneratorPeek(lazyGenerator)
projectedBindings = lazyGenerator.successful and first(
lazyGenerator) or {}
# First we check if we can combine a large group of subsequent body literals
# into a single query
# if we have a template map then we use it to further
# distinguish which builtins can be solved via
# cumulative SPARQl query - else we solve
# builtins one at a time
def sparqlResolvable(literal):
if isinstance(literal, Uniterm):
return not literal.naf and GetOp(literal) not in derivedPreds
else:
return isinstance(literal, N3Builtin) and \
literal.uri in factGraph.templateMap
def sparqlResolvableNoTemplates(literal):
if isinstance(literal, Uniterm):
return not literal.naf and GetOp(literal) not in derivedPreds
else:
return False
conjGroundLiterals = list(
itertools.takewhile(
hasattr(factGraph, 'templateMap') and sparqlResolvable or
sparqlResolvableNoTemplates,
remainingBodyList))
bodyLiteralIterator = iter(remainingBodyList)
if len(conjGroundLiterals) > 1:
# If there are literals to combine *and* a mapping from rule
# builtins to SPARQL FILTER templates ..
basePredicateVars = set(
reduce(lambda x, y: x + y,
[list(GetVariables(arg, secondOrder=True)) for arg in conjGroundLiterals]))
if projectedBindings:
openVars = basePredicateVars.intersection(projectedBindings)
else:
# We don't have any given bindings, so we need to treat
# the body as an open query
openVars = basePredicateVars
queryConj = EDBQuery([copy.deepcopy(lit) for lit in conjGroundLiterals],
factGraph,
openVars,
projectedBindings)
query, answers = queryConj.evaluate(debug)
if isinstance(answers, bool):
combinedAnswers = {}
rtCheck = answers
else:
if projectedBindings:
combinedAnswers = (mergeMappings1To2(ans,
projectedBindings,
makeImmutable=True) for ans in answers)
else:
combinedAnswers = (MakeImmutableDict(ans)
for ans in answers)
combinedAnsLazyGenerator = lazyGeneratorPeek(combinedAnswers)
rtCheck = combinedAnsLazyGenerator.successful
if not rtCheck:
raise RuleFailure(
"No answers for combined SPARQL query: %s" % query)
else:
# We have solved the previous N body literals with a single
# conjunctive query, now we need to make each of the literals
# an antecedent to a 'query' step.
if buildProof:
queryStep = InferenceStep(None, source='some RDF graph')
# FIXME: subquery undefined
queryStep.groundQuery = subquery
queryStep.bindings = {} # combinedAnswers[-1]
# FIXME: subquery undefined
queryHash = URIRef(
"tag:[email protected]:Queries#" +
makeMD5Digest(subquery))
queryStep.identifier = queryHash
for subGoal in conjGroundLiterals:
subNs = NodeSet(subGoal.toRDFTuple(),
identifier=BNode())
subNs.steps.append(queryStep)
step.antecedents.append(subNs)
queryStep.parent = subNs
for rt, _step in invokeRule(
isinstance(answers, bool) and [
projectedBindings] or combinedAnsLazyGenerator,
iter(remainingBodyList[len(conjGroundLiterals):]),
sip,
otherargs,
isinstance(answers, bool),
step,
debug=debug,
buildProof=buildProof):
yield rt, _step
else:
# Continue processing rule body condition
# one literal at a time
try:
bodyLiteral = next(
bodyLiteralIterator) if py3compat.PY3 else bodyLiteralIterator.next()
# if a N3 builtin, execute it using given bindings for boolean answer
# builtins are moved to end of rule when evaluating rules via
# sip
if isinstance(bodyLiteral, N3Builtin):
lhs = bodyLiteral.argument
rhs = bodyLiteral.result
lhs = isinstance(
lhs, Variable) and projectedBindings[lhs] or lhs
rhs = isinstance(
rhs, Variable) and projectedBindings[rhs] or rhs
assert lhs is not None and rhs is not None
if bodyLiteral.func(lhs, rhs):
if debug:
print("Invoked %s(%s, %s) -> True" % (
bodyLiteral.uri, lhs, rhs))
# positive answer means we can continue processing the
# rule body
if buildProof:
ns = NodeSet(bodyLiteral.toRDFTuple(),
identifier=BNode())
step.antecedents.append(ns)
for rt, _step in invokeRule(
[projectedBindings],
bodyLiteralIterator,
sip,
otherargs,
step,
priorBooleanGoalSuccess,
debug=debug,
buildProof=buildProof):
yield rt, _step
else:
if debug:
print("Successfully invoked %s(%s, %s) -> False" % (
bodyLiteral.uri, lhs, rhs))
raise RuleFailure("Failed builtin invokation %s(%s, %s)" %
(bodyLiteral.uri, lhs, rhs))
else:
# For every body literal, subqueries are generated according
# to the sip
sipArcPred = URIRef(GetOp(bodyLiteral) +
'_' + '_'.join(GetArgs(bodyLiteral)))
assert len(list(IncomingSIPArcs(sip, sipArcPred))) < 2
subquery = copy.deepcopy(bodyLiteral)
subquery.ground(projectedBindings)
for N, x in IncomingSIPArcs(sip, sipArcPred):
# That is, each subquery contains values for the bound arguments
# that are passed through the sip arcs entering the node
# corresponding to that literal
# Create query out of body literal and apply
# sip-provided bindings
subquery = copy.deepcopy(bodyLiteral)
subquery.ground(projectedBindings)
if literalIsGround(subquery):
# subquery is ground, so there will only be boolean answers
# we return the conjunction of the answers for the current
# subquery
answer = False
ns = None
answers = first(
itertools.dropwhile(
lambda item: not item[0],
SipStrategy(
subquery.toRDFTuple(),
sipCollection,
factGraph,
derivedPreds,
MakeImmutableDict(projectedBindings),
processedRules,
network=step is not None and
step.parent.network or None,
debug=debug,
buildProof=buildProof,
memoizeMemory=memoizeMemory,
proofLevel=proofLevel)))
if answers:
answer, ns = answers
if not answer and not bodyLiteral.naf or \
(answer and bodyLiteral.naf):
# negative answer means the invokation of the rule fails
# either because we have a positive literal and there
# is no answer for the subgoal or the literal is
# negative and there is an answer for the subgoal
raise RuleFailure(
"No solutions solving ground query %s" % subquery)
else:
if buildProof:
if not answer and bodyLiteral.naf:
ns.naf = True
step.antecedents.append(ns)
# positive answer means we can continue processing the rule body
# either because we have a positive literal and answers
# for subgoal or a negative literal and no answers for the
# the goal
for rt, _step in invokeRule(
[projectedBindings],
bodyLiteralIterator,
sip,
otherargs,
True,
step,
debug=debug):
yield rt, _step
else:
_answers = \
SipStrategy(
subquery.toRDFTuple(),
sipCollection,
factGraph,
derivedPreds,
MakeImmutableDict(
projectedBindings),
processedRules,
network=step is not None and
step.parent.network or None,
debug=debug,
buildProof=buildProof,
memoizeMemory=memoizeMemory,
proofLevel=proofLevel)
# solve (non-ground) subgoal
def collectAnswers(_ans):
for ans, ns in _ans:
if isinstance(ans, dict):
try:
map = mergeMappings1To2(
ans, projectedBindings,
makeImmutable=True)
yield map
except:
pass
combinedAnswers = collectAnswers(_answers)
answers = lazyGeneratorPeek(combinedAnswers)
if not answers.successful \
and not bodyLiteral.naf \
or (bodyLiteral.naf and answers.successful):
raise RuleFailure(
"No solutions solving ground query %s" % subquery)
else:
# Either we have a positive subgoal and answers
# or a negative subgoal and no answers
if buildProof:
if answers.successful:
goals = set([g for a, g in answers])
assert len(goals) == 1
step.antecedents.append(goals.pop())
else:
newNs = NodeSet(
bodyLiteral.toRDFTuple(),
network=step.parent.network,
identifier=BNode(),
naf=True)
step.antecedents.append(newNs)
for rt, _step in invokeRule(
answers,
bodyLiteralIterator,
sip,
otherargs,
priorBooleanGoalSuccess,
step,
debug=debug,
buildProof=buildProof):
yield rt, _step
except StopIteration:
# Finished processing rule
if priorBooleanGoalSuccess:
yield projectedBindings and projectedBindings or True, step
elif projectedBindings:
# Return the most recent (cumulative) answers and the given
# step
yield projectedBindings, step
else:
raise RuleFailure(
"Finished processing rule unsuccessfully")
def conjunctiveSipStrategy(self,goalsRemaining,factGraph,bindings=None):
"""
Given a conjunctive set of triples, invoke sip-strategy passing
on intermediate solutions to facilitate 'join' behavior
"""
bindings = bindings if bindings else {}
try:
tp = goalsRemaining.next()
assert isinstance(bindings,dict)
dPred = self.derivedPredicateFromTriple(tp)
if dPred is None:
baseEDBQuery = EDBQuery([BuildUnitermFromTuple(tp)],
self.edb,
bindings=bindings)
if self.DEBUG:
print >>sys.stderr,"Evaluating TP against EDB: ",\
baseEDBQuery.asSPARQL()
query,rt = baseEDBQuery.evaluate()
# _vars = baseEDBQuery.returnVars
for item in rt:
bindings.update(item)
for ansDict in self.conjunctiveSipStrategy(
goalsRemaining,
factGraph,
bindings):
yield ansDict
else:
queryLit = BuildUnitermFromTuple(tp)
currentOp = GetOp(queryLit)
queryLit.setOperator(currentOp)
query=EDBQuery([queryLit],
self.edb,
bindings=bindings)
if bindings:
tp=first(query.formulae).toRDFTuple()
if self.DEBUG:
print >>sys.stderr,"Goal/Query: ", query.asSPARQL()
SetupDDLAndAdornProgram(
self.edb,
self.idb,
[tp],
derivedPreds=self.derivedPredicates,
ignoreUnboundDPreds = True,
hybridPreds2Replace=self.hybridPredicates)
if self.hybridPredicates:
lit = BuildUnitermFromTuple(tp)
op = GetOp(lit)
if op in self.hybridPredicates:
lit.setOperator(URIRef(op+u'_derived'))
tp = lit.toRDFTuple()
sipCollection=PrepareSipCollection(self.edb.adornedProgram)
if self.DEBUG and sipCollection:
for sip in SIPRepresentation(sipCollection):
print >>sys.stderr,sip
pprint(list(self.edb.adornedProgram),sys.stderr)
elif self.DEBUG:
print >> sys.stderr, "No SIP graph!"
for nextAnswer,ns in self.invokeDecisionProcedure(
tp,
factGraph,
bindings,
self.DEBUG,
sipCollection):
nonGroundGoal = isinstance(nextAnswer,dict)
if nonGroundGoal or nextAnswer:
#Either we recieved bindings from top-down evaluation
#or we (successfully) proved a ground query
if not nonGroundGoal:
#Attempt to prove a ground query, return the response
rt = nextAnswer
else:
#Recieved solutions to 'open' query, merge with given bindings
#and continue
rt = mergeMappings1To2(bindings,nextAnswer)
#either answers were provided (the goal wasn't grounded) or
#the goal was ground and successfully proved
for ansDict in self.conjunctiveSipStrategy(
goalsRemaining,
factGraph,
rt):
yield ansDict
except StopIteration:
yield bindings
#builtins to SPARQL FILTER templates ..
basePredicateVars = set(
reduce(
lambda x, y: x + y,
map(lambda arg: list(GetVariables(arg, secondOrder=True)),
conjGroundLiterals)))
if projectedBindings:
openVars = basePredicateVars.intersection(projectedBindings)
else:
#We don't have any given bindings, so we need to treat
#the body as an open query
openVars = basePredicateVars
queryConj = EDBQuery(
[copy.deepcopy(lit) for lit in conjGroundLiterals], factGraph,
openVars, projectedBindings)
query, answers = queryConj.evaluate(debug)
if isinstance(answers, bool):
combinedAnswers = {}
rtCheck = answers
else:
if projectedBindings:
combinedAnswers = (mergeMappings1To2(ans,
projectedBindings,
makeImmutable=True)
for ans in answers)
else:
combinedAnswers = (MakeImmutableDict(ans)
for ans in answers)
combinedAnsLazyGenerator = lazyGeneratorPeek(combinedAnswers)
rtCheck = combinedAnsLazyGenerator.successful
if not rtCheck:
def invokeRule(priorAnswers,
bodyLiteralIterator,
sip,
otherargs,
priorBooleanGoalSuccess=False,
step=None,
debug=False,
buildProof=False):
"""
Continue invokation of rule using (given) prior answers and list of
remaining body literals (& rule sip). If prior answers is a list,
computation is split disjunctively
[..] By combining the answers to all these subqueries, we generate
answers for the original query involving the rule head
Can also takes a PML step and updates it as it navigates the
top-down proof tree (passing it on and updating it where necessary)
"""
assert not buildProof or step is not None
proofLevel, memoizeMemory, sipCollection, \
factGraph, derivedPreds, processedRules = otherargs
remainingBodyList = [i for i in bodyLiteralIterator]
lazyGenerator = lazyGeneratorPeek(priorAnswers, 2)
if lazyGenerator.successful:
# There are multiple answers in this step, we need to call invokeRule
# recursively for each answer, returning the first positive attempt
success = False
rt = None
_step = None
ansNo = 0
for priorAns in lazyGenerator:
ansNo += 1
try:
if buildProof:
newStep = InferenceStep(step.parent,
step.rule,
source=step.source)
newStep.antecedents = [ant for ant in step.antecedents]
else:
newStep = None
for rt, _step in\
invokeRule([priorAns],
iter([i for i in remainingBodyList]),
sip,
otherargs,
priorBooleanGoalSuccess,
newStep,
debug=debug,
buildProof=buildProof):
if rt:
yield rt, _step
except RuleFailure:
pass
if not success:
# None of prior answers were successful
# indicate termination of rule processing
raise RuleFailure(
"Unable to solve either of %s against remainder of rule: %s" %
(ansNo, remainingBodyList))
# yield False, _InferenceStep(step.parent, step.rule, source=step.source)
else:
lazyGenerator = lazyGeneratorPeek(lazyGenerator)
projectedBindings = lazyGenerator.successful and first(
lazyGenerator) or {}
# First we check if we can combine a large group of subsequent body literals
# into a single query
# if we have a template map then we use it to further
# distinguish which builtins can be solved via
# cumulative SPARQl query - else we solve
# builtins one at a time
def sparqlResolvable(literal):
if isinstance(literal, Uniterm):
return not literal.naf and GetOp(literal) not in derivedPreds
else:
return isinstance(literal, N3Builtin) and \
literal.uri in factGraph.templateMap
def sparqlResolvableNoTemplates(literal):
if isinstance(literal, Uniterm):
return not literal.naf and GetOp(literal) not in derivedPreds
else:
return False
conjGroundLiterals = list(
itertools.takewhile(
hasattr(factGraph, 'templateMap') and sparqlResolvable or \
sparqlResolvableNoTemplates,
remainingBodyList))
bodyLiteralIterator = iter(remainingBodyList)
if len(conjGroundLiterals) > 1:
# If there are literals to combine *and* a mapping from rule
# builtins to SPARQL FILTER templates ..
basePredicateVars = set(
reduce(lambda x, y: x + y, [
list(GetVariables(arg, secondOrder=True))
for arg in conjGroundLiterals
]))
if projectedBindings:
openVars = basePredicateVars.intersection(projectedBindings)
else:
# We don't have any given bindings, so we need to treat
# the body as an open query
openVars = basePredicateVars
queryConj = EDBQuery(
[copy.deepcopy(lit) for lit in conjGroundLiterals], factGraph,
openVars, projectedBindings)
query, answers = queryConj.evaluate(debug)
if isinstance(answers, bool):
combinedAnswers = {}
rtCheck = answers
else:
if projectedBindings:
combinedAnswers = (mergeMappings1To2(ans,
projectedBindings,
makeImmutable=True)
for ans in answers)
else:
combinedAnswers = (MakeImmutableDict(ans)
for ans in answers)
combinedAnsLazyGenerator = lazyGeneratorPeek(combinedAnswers)
rtCheck = combinedAnsLazyGenerator.successful
if not rtCheck:
raise RuleFailure("No answers for combined SPARQL query: %s" %
query)
else:
# We have solved the previous N body literals with a single
# conjunctive query, now we need to make each of the literals
# an antecedent to a 'query' step.
if buildProof:
queryStep = InferenceStep(None, source='some RDF graph')
queryStep.groundQuery = subquery
queryStep.bindings = {} # combinedAnswers[-1]
queryHash = URIRef(
"tag:[email protected]:Queries#" + \
makeMD5Digest(subquery))
queryStep.identifier = queryHash
for subGoal in conjGroundLiterals:
subNs = NodeSet(subGoal.toRDFTuple(),
identifier=BNode())
subNs.steps.append(queryStep)
step.antecedents.append(subNs)
queryStep.parent = subNs
for rt, _step in invokeRule(
isinstance(answers, bool) and [projectedBindings]
or combinedAnsLazyGenerator,
iter(remainingBodyList[len(conjGroundLiterals):]),
sip,
otherargs,
isinstance(answers, bool),
step,
debug=debug,
buildProof=buildProof):
yield rt, _step
else:
# Continue processing rule body condition
# one literal at a time
try:
bodyLiteral = next(
bodyLiteralIterator
) if py3compat.PY3 else bodyLiteralIterator.next()
# if a N3 builtin, execute it using given bindings for boolean answer
# builtins are moved to end of rule when evaluating rules via sip
if isinstance(bodyLiteral, N3Builtin):
lhs = bodyLiteral.argument
rhs = bodyLiteral.result
lhs = isinstance(
lhs, Variable) and projectedBindings[lhs] or lhs
rhs = isinstance(
rhs, Variable) and projectedBindings[rhs] or rhs
assert lhs is not None and rhs is not None
if bodyLiteral.func(lhs, rhs):
if debug:
print("Invoked %s(%s, %s) -> True" %
(bodyLiteral.uri, lhs, rhs))
# positive answer means we can continue processing the rule body
if buildProof:
ns = NodeSet(bodyLiteral.toRDFTuple(),
identifier=BNode())
step.antecedents.append(ns)
for rt, _step in invokeRule([projectedBindings],
bodyLiteralIterator,
sip,
otherargs,
step,
priorBooleanGoalSuccess,
debug=debug,
buildProof=buildProof):
yield rt, _step
else:
if debug:
print("Successfully invoked %s(%s, %s) -> False" %
(bodyLiteral.uri, lhs, rhs))
raise RuleFailure(
"Failed builtin invokation %s(%s, %s)" %
(bodyLiteral.uri, lhs, rhs))
else:
# For every body literal, subqueries are generated according
# to the sip
sipArcPred = URIRef(GetOp(bodyLiteral) + \
'_' + '_'.join(GetArgs(bodyLiteral)))
assert len(list(IncomingSIPArcs(sip, sipArcPred))) < 2
subquery = copy.deepcopy(bodyLiteral)
subquery.ground(projectedBindings)
for N, x in IncomingSIPArcs(sip, sipArcPred):
#That is, each subquery contains values for the bound arguments
#that are passed through the sip arcs entering the node
#corresponding to that literal
#Create query out of body literal and apply sip-provided bindings
subquery = copy.deepcopy(bodyLiteral)
subquery.ground(projectedBindings)
if literalIsGround(subquery):
#subquery is ground, so there will only be boolean answers
#we return the conjunction of the answers for the current
#subquery
answer = False
ns = None
answers = first(
itertools.dropwhile(
lambda item: not item[0],
SipStrategy(
subquery.toRDFTuple(),
sipCollection,
factGraph,
derivedPreds,
MakeImmutableDict(projectedBindings),
processedRules,
network=step is not None and \
step.parent.network or None,
debug=debug,
buildProof=buildProof,
memoizeMemory=memoizeMemory,
proofLevel=proofLevel)))
if answers:
answer, ns = answers
if not answer and not bodyLiteral.naf or \
(answer and bodyLiteral.naf):
#negative answer means the invokation of the rule fails
#either because we have a positive literal and there
#is no answer for the subgoal or the literal is
#negative and there is an answer for the subgoal
raise RuleFailure(
"No solutions solving ground query %s" %
subquery)
else:
if buildProof:
if not answer and bodyLiteral.naf:
ns.naf = True
step.antecedents.append(ns)
#positive answer means we can continue processing the rule body
#either because we have a positive literal and answers
#for subgoal or a negative literal and no answers for the
#the goal
for rt, _step in invokeRule([projectedBindings],
bodyLiteralIterator,
sip,
otherargs,
True,
step,
debug=debug):
yield rt, _step
else:
_answers = \
SipStrategy(subquery.toRDFTuple(),
sipCollection,
factGraph,
derivedPreds,
MakeImmutableDict(projectedBindings),
processedRules,
network=step is not None and \
step.parent.network or None,
debug=debug,
buildProof=buildProof,
memoizeMemory=memoizeMemory,
proofLevel=proofLevel)
# solve (non-ground) subgoal
def collectAnswers(_ans):
for ans, ns in _ans:
if isinstance(ans, dict):
try:
map = mergeMappings1To2(
ans,
projectedBindings,
makeImmutable=True)
yield map
except:
pass
combinedAnswers = collectAnswers(_answers)
answers = lazyGeneratorPeek(combinedAnswers)
if not answers.successful \
and not bodyLiteral.naf \
or (bodyLiteral.naf and answers.successful):
raise RuleFailure(
"No solutions solving ground query %s" %
subquery)
else:
# Either we have a positive subgoal and answers
# or a negative subgoal and no answers
if buildProof:
if answers.successful:
goals = set([g for a, g in answers])
assert len(goals) == 1
step.antecedents.append(goals.pop())
else:
newNs = NodeSet(
bodyLiteral.toRDFTuple(),
network=step.parent.network,
identifier=BNode(),
naf=True)
step.antecedents.append(newNs)
for rt, _step in invokeRule(
answers,
bodyLiteralIterator,
sip,
otherargs,
priorBooleanGoalSuccess,
step,
debug=debug,
buildProof=buildProof):
yield rt, _step
except StopIteration:
#Finished processing rule
if priorBooleanGoalSuccess:
yield projectedBindings and projectedBindings or True, step
elif projectedBindings:
#Return the most recent (cumulative) answers and the given step
yield projectedBindings, step
else:
raise RuleFailure(
"Finished processing rule unsuccessfully")
def conjunctiveSipStrategy(self, goalsRemaining, factGraph, bindings=None):
"""
Given a conjunctive set of triples, invoke sip-strategy passing
on intermediate solutions to facilitate 'join' behavior
"""
bindings = bindings if bindings else {}
try:
tp = next(goalsRemaining)
assert isinstance(bindings, dict)
dPred = self.derivedPredicateFromTriple(tp)
if dPred is None:
baseEDBQuery = EDBQuery([BuildUnitermFromTuple(tp)],
self.edb,
bindings=bindings)
if self.DEBUG:
_debug(
"Evaluating TP against EDB: %s" %
baseEDBQuery.asSPARQL())
query, rt = baseEDBQuery.evaluate()
if isinstance(rt, bool) and rt:
yield bindings
elif not isinstance(rt, bool):
rt = list(rt)
remaining_goals = itertools.tee(goalsRemaining, len(rt))
for idx in range(len(rt)):
item = {}
item.update(rt[idx])
item.update(bindings)
if self.DEBUG:
_debug("Solution from EDB query: %s" % item)
for ansDict in self.conjunctiveSipStrategy(
remaining_goals[idx],
factGraph,
item):
yield ansDict
else:
queryLit = BuildUnitermFromTuple(tp)
currentOp = GetOp(queryLit)
queryLit.setOperator(currentOp)
query = EDBQuery([queryLit],
self.edb,
bindings=bindings)
if bindings:
tp = first(query.formulae).toRDFTuple()
if self.DEBUG:
_debug("Goal/Query: %s" % query.asSPARQL())
tp = self.hybridPredQueryPreparation(tp)
SetupDDLAndAdornProgram(
self.edb,
self.idb,
[tp],
derivedPreds=self.derivedPredicates,
ignoreUnboundDPreds=True)
sipCollection = PrepareSipCollection(self.edb.adornedProgram)
if self.DEBUG and sipCollection:
for sip in SIPRepresentation(sipCollection):
_debug(sip)
_debug(pformat(list(self.edb.adornedProgram)))
elif self.DEBUG:
_debug("No SIP graph.")
for nextAnswer, ns in self.invokeDecisionProcedure(
tp,
factGraph,
bindings,
self.DEBUG,
sipCollection):
if isinstance(nextAnswer, dict):
# Received solutions to 'open' query, merge with given
# bindings and continue
for ansDict in self.conjunctiveSipStrategy(
goalsRemaining,
factGraph,
mergeMappings1To2(bindings,
nextAnswer)):
yield ansDict
elif nextAnswer:
# we (successfully) proved a ground query, pass on
# bindings
assert isinstance(nextAnswer, bool)
for ansDict in self.conjunctiveSipStrategy(
goalsRemaining,
factGraph,
bindings):
yield ansDict
except StopIteration:
yield bindings
def conjunctiveSipStrategy(self, goalsRemaining, factGraph, bindings=None):
"""
Given a conjunctive set of triples, invoke sip-strategy passing
on intermediate solutions to facilitate 'join' behavior
"""
bindings = bindings if bindings else {}
try:
tp = next(goalsRemaining)
assert isinstance(bindings, dict)
dPred = self.derivedPredicateFromTriple(tp)
if dPred is None:
baseEDBQuery = EDBQuery([BuildUnitermFromTuple(tp)],
self.edb,
bindings=bindings)
if self.DEBUG:
print("Evaluating TP against EDB:%s" %
baseEDBQuery.asSPARQL())
query, rt = baseEDBQuery.evaluate()
# _vars = baseEDBQuery.returnVars
for item in rt:
bindings.update(item)
for ansDict in self.conjunctiveSipStrategy(
goalsRemaining, factGraph, bindings):
yield ansDict
else:
queryLit = BuildUnitermFromTuple(tp)
currentOp = GetOp(queryLit)
queryLit.setOperator(currentOp)
query = EDBQuery([queryLit], self.edb, bindings=bindings)
if bindings:
tp = first(query.formulae).toRDFTuple()
if self.DEBUG:
print("Goal/Query: ", query.asSPARQL())
SetupDDLAndAdornProgram(
self.edb,
self.idb, [tp],
derivedPreds=self.derivedPredicates,
ignoreUnboundDPreds=True,
hybridPreds2Replace=self.hybridPredicates)
if self.hybridPredicates:
lit = BuildUnitermFromTuple(tp)
op = GetOp(lit)
if op in self.hybridPredicates:
lit.setOperator(URIRef(op + u'_derived'))
tp = lit.toRDFTuple()
sipCollection = PrepareSipCollection(self.edb.adornedProgram)
if self.DEBUG and sipCollection:
for sip in SIPRepresentation(sipCollection):
print(sip)
pprint(list(self.edb.adornedProgram), sys.stderr)
elif self.DEBUG:
print("No SIP graph.")
for nextAnswer, ns in self.invokeDecisionProcedure(
tp, factGraph, bindings, self.DEBUG, sipCollection):
nonGroundGoal = isinstance(nextAnswer, dict)
if nonGroundGoal or nextAnswer:
#Either we recieved bindings from top-down evaluation
#or we (successfully) proved a ground query
if not nonGroundGoal:
#Attempt to prove a ground query, return the response
rt = nextAnswer
else:
#Recieved solutions to 'open' query, merge with given bindings
#and continue
rt = mergeMappings1To2(bindings, nextAnswer)
#either answers were provided (the goal wasn't grounded) or
#the goal was ground and successfully proved
for ansDict in self.conjunctiveSipStrategy(
goalsRemaining, factGraph, rt):
yield ansDict
except StopIteration:
yield bindings
