Python util.first函数代码示例

    def testUnivInversion(self):
        UniversalNominalRangeTransformer().transform(self.ontGraph)
        self.failUnlessEqual(len(list(self.foo.subClassOf)),
                             1,
                             "There should still be one subsumed restriction")
        subC = CastClass(first(self.foo.subClassOf))
        self.failUnless(not isinstance(subC, Restriction),
                        "subclass of a restriction")
        self.failUnless(subC.complementOf is not None, "Should be a complement.")
        innerC = CastClass(subC.complementOf)
        self.failUnless(isinstance(innerC, Restriction),
                        "complement of a restriction, not %r" % innerC)
        self.failUnlessEqual(innerC.onProperty,
                             EX_NS.propFoo,
                             "restriction on propFoo")
        self.failUnless(innerC.someValuesFrom, "converted to an existential restriction not %r" % innerC)
        invertedC = CastClass(innerC.someValuesFrom)
        self.failUnless(isinstance(invertedC, EnumeratedClass),
                        "existential restriction on enumerated class")
        self.assertEqual(len(invertedC),
                         2,
                        "existencial restriction on enumerated class of length 2")
        self.assertEqual(repr(invertedC),
                         "{ ex:individual2 ex:individual3 }",
                         "The negated partition should exclude individual1")
        NominalRangeTransformer().transform(self.ontGraph)
        DemorganTransformer().transform(self.ontGraph)

        subC = CastClass(first(self.foo.subClassOf))
        self.assertEqual(repr(subC),
                        "( ( not ( ex:propFoo value ex:individual2 ) ) and ( not ( ex:propFoo value ex:individual3 ) ) )")

    def finalize(self):
        if self.adornment:
            if self.hasBindings():
                if len(self.adornment) == 1:
                    # adorned predicate occurrence with one out of two arguments bound
                    # convert: It becomes a unary predicate
                    # (an rdf:type assertion)
                    self.arg[-1] = URIRef(GetOp(self) + "_query_" + first(self.adornment))
                    self.arg[0] = first(self.getDistinguishedVariables())
                    self.op = RDF.type
                elif "".join(self.adornment) == "bb":
                    # Two bound args
                    self.setOperator(URIRef(self.op + "_query_bb"))
                else:
                    # remove unbound argument, and reduce arity
                    singleArg = first(self.getDistinguishedVariables())
                    self.arg[-1] = URIRef(GetOp(self) + "_query_" + "".join(self.adornment))
                    self.arg[0] = singleArg
                    self.op = RDF.type

            else:
                currentOp = GetOp(self)
                self.op = RDF.type
                self.arg = [currentOp, BFP_RULE.OpenQuery]
        else:
            if GetOp(self) != HIGHER_ORDER_QUERY:
                self.setOperator(URIRef(GetOp(self) + "_query"))
        self._recalculateHash()

def Th(owlGraph,_class,variable=Variable('X'),position=LHS):
    """
    DLP head (antecedent) knowledge assertional forms (ABox assertions, conjunction of
    ABox assertions, and universal role restriction assertions)
    """
    props = list(set(owlGraph.predicates(subject=_class)))
    if OWL_NS.allValuesFrom in props:
        #http://www.w3.org/TR/owl-semantics/#owl_allValuesFrom
        for s,p,o in owlGraph.triples((_class,OWL_NS.allValuesFrom,None)):
            prop = list(owlGraph.objects(subject=_class,predicate=OWL_NS.onProperty))[0]
            newVar = Variable(BNode())
            body = Uniterm(prop,[variable,newVar],newNss=owlGraph.namespaces())
            for head in Th(owlGraph,o,variable=newVar):
                yield Clause(body,head)
    elif OWL_NS.hasValue in props:
        prop = list(owlGraph.objects(subject=_class,predicate=OWL_NS.onProperty))[0]
        o =first(owlGraph.objects(subject=_class,predicate=OWL_NS.hasValue))
        yield Uniterm(prop,[variable,o],newNss=owlGraph.namespaces())
    elif OWL_NS.someValuesFrom in props:
        #http://www.w3.org/TR/owl-semantics/#someValuesFrom
        for s,p,o in owlGraph.triples((_class,OWL_NS.someValuesFrom,None)):
            prop = list(owlGraph.objects(subject=_class,predicate=OWL_NS.onProperty))[0]
            newVar = BNode()
            yield And([Uniterm(prop,[variable,newVar],newNss=owlGraph.namespaces()),
                        generatorFlattener(Th(owlGraph,o,variable=newVar))])
    elif OWL_NS.intersectionOf in props:
        from FuXi.Syntax.InfixOWL import BooleanClass
        yield And([first(Th(owlGraph,h,variable)) for h in BooleanClass(_class)])
    else:
        #Simple class
        yield Uniterm(RDF.type,[variable,
                                isinstance(_class,BNode) and SkolemizeExistentialClasses(_class) or _class],
                                newNss=owlGraph.namespaces())

def RDFTuplesToSPARQL(conjunct, 
                     edb, 
                     isGround=False, 
                     vars=[],
                     symmAtomicInclusion=False,
                     specialBNodeHandling=None):
   """
   Takes a conjunction of Horn literals and returns the 
   corresponding SPARQL query 
   """
   queryType = isGround and "ASK" or "SELECT %s"%(' '.join([v.n3() 
                                                            for v in vars]))
   queryShell = len(conjunct)>1 and "%s {\n%s\n}" or "%s { %s }"

   if symmAtomicInclusion:
       if vars:
           var = vars.pop()
           prefix = "%s a ?KIND"%var.n3()
       else:

           prefix = "%s a ?KIND"%first([first(iterCondition(lit)).arg[0].n3() for lit in conjunct])
       conjunct = ( i.formulae[0] if isinstance(i,And) else i for i in conjunct )
       subquery = queryShell%(queryType,
                              "%s\nFILTER(%s)"%(
                            prefix,
                            ' ||\n'.join([
                              '?KIND = %s'%edb.qname(GetOp(lit)) 
                                   for lit in conjunct])))        
   else: 
       subquery = queryShell%(queryType,' .\n'.join(['\t'+tripleToTriplePattern(
                                                             edb,
                                                             lit,
                                                             specialBNodeHandling) 
                                 for lit in conjunct ]))
   return subquery

def _testPositive(uri, manifest):
    if verbose:
        write(u"TESTING: %s" % uri)
    result = 0  # 1=failed, 0=passed
    inDoc = first(manifest.objects(uri, TEST["inputDocument"]))
    outDoc = first(manifest.objects(uri, TEST["outputDocument"]))
    expected = Graph()
    if outDoc[-3:] == ".nt":
        format = "nt"
    else:
        format = "xml"
    expected.parse(cached_file(outDoc), publicID=outDoc, format=format)
    store = TestStore(expected)
    if inDoc[-3:] == ".nt":
        format = "nt"
    else:
        format = "xml"

    try:
        store.parse(cached_file(inDoc), publicID=inDoc, format=format)
    except ParserError, pe:
        write("Failed '")
        write(inDoc)
        write("' failed with")
        raise pe
        try:
            write(type(pe))
        except:
            write("sorry could not dump out error.")
        result = 1

    def extractRule(self,rule):
        vars,impl = self.rules[rule]
        body,bodyType,head,headType = self.implications[impl]
        allVars = map(self.extractTerm,Collection(self.graph,vars))
        head = first(self.extractPredication(head,headType))
        if bodyType == RIF_NS.And:
            body = map(
                   lambda i: first(self.extractPredication(
                       i,
                       first(self.graph.objects(i,RDF.type)))
                   ),
                   Collection(self.graph,first(self.graph.objects(body,RIF_NS.formulas)))
            )

        else:
            body = self.extractPredication(body,bodyType)
        if isinstance(body,list):
            body = And([first(body)]) if len(body) == 1 else And(body)
        nsMapping = {}
        nsMapping.update(self.nsBindings)
        return Rule(
            Clause(body,head),
            declare=allVars,
            nsMapping=nsMapping
        )

def IncomingSIPArcs(sip,predOcc):
    """docstring for IncomingSIPArcs"""
    for s,p,o in sip.triples((None,None,predOcc)):
        if (p,RDF.type,MAGIC.SipArc) in sip:
            if (s,RDF.type,MAGIC.BoundHeadPredicate) in sip:
                yield [s],Collection(sip,first(sip.objects(p,MAGIC.bindings)))
            else:
                yield Collection(sip,s),Collection(sip,first(sip.objects(p,MAGIC.bindings)))

 def testHiddenDemorgan(self):
     NormalFormReduction(self.ontGraph)
     self.failUnless(first(self.foo.subClassOf).complementOf,
                     "should be the negation of a boolean class")
     innerC = CastClass(first(self.foo.subClassOf).complementOf)
     self.failUnless(isinstance(innerC, BooleanClass) and \
                     innerC._operator == OWL_NS.intersectionOf,
                     "should be the negation of a conjunct")
     self.assertEqual(repr(innerC), "( ex:alpha and ex:omega )")

 def extractTerm(self, term):
     if (term, RDF.type, RIF_NS.Var) in self.graph:
         return Variable(first(self.graph.objects(term, RIF_NS.varname)))
     elif (term, RIF_NS.constIRI, None) in self.graph:
         iriLit = first(self.graph.objects(term, RIF_NS.constIRI))
         assert iriLit.datatype == XSD_NS.anyURI
         return URIRef(iriLit)
     else:
         return first(self.graph.objects(term, RIF_NS.value))

 def extractFrame(self, frame):
     obj, slots = self.frames[frame]
     rt = []
     for slot in Collection(self.graph, slots):
         k = self.extractTerm(first(self.graph.objects(slot, RIF_NS.slotkey)))
         v = self.extractTerm(first(self.graph.objects(slot, RIF_NS.slotvalue)))
         rt.append(
             Uniterm(k, [self.extractTerm(obj), v])
         )
     return rt

    def extractImp(self, impl):
        body, bodyType, head, headType = self.implications[impl]
        head = first(self.extractPredication(head, headType))
        if bodyType == RIF_NS.And:
            raise
        else:
            body = self.extractPredication(body, bodyType)

        body = And([first(body)]) if len(body) == 1 else And(body)
        return Rule(Clause(body, head), declare=[])

 def predicate(self, predicate, object, depth=1):
     writer = self.writer
     store = self.store
     writer.push(predicate)
     if isinstance(object, Literal):
         attributes = ""
         if object.language:
             writer.attribute(XMLLANG, object.language)
         if object.datatype:
             writer.attribute(RDF.datatype, object.datatype)
         writer.text(object)
     elif object in self.__serialized or not (object, None, None) in store:
         if isinstance(object, BNode):
             if more_than(store.triples((None, None, object)), 0):
                 writer.attribute(RDF.nodeID, fix(object))
         else:
             writer.attribute(RDF.resource, self.relativize(object))
     else:
         if first(store.objects(object, RDF.first)):  # may not have type RDF.List
             collection = object
             self.__serialized[object] = 1
             # TODO: warn that any assertions on object other than
             # RDF.first and RDF.rest are ignored... including RDF.List
             writer.attribute(RDF.parseType, "Collection")
             col = Collection(store, object)
             for item in col:
                 if isinstance(item, URIRef):
                     self.forceRDFAbout.add(item)
                 self.subject(item)
                 if not isinstance(item, URIRef):
                     self.__serialized[item] = 1
         else:
             if first(store.triples_choices((object, RDF.type, [OWL_NS.Class, RDFS.Class]))) and isinstance(
                 object, URIRef
             ):
                 writer.attribute(RDF.resource, self.relativize(object))
             elif depth <= self.max_depth:
                 self.subject(object, depth + 1)
             elif isinstance(object, BNode):
                 if (
                     not object in self.__serialized
                     and (object, None, None) in store
                     and len(list(store.subjects(object=object))) == 1
                 ):
                     # inline blank nodes if they haven't been serialized yet and are
                     # only referenced once (regardless of depth)
                     self.subject(object, depth + 1)
                 else:
                     writer.attribute(RDF.nodeID, fix(object))
             else:
                 writer.attribute(RDF.resource, self.relativize(object))
     writer.pop(predicate)

    def testOtherForm2(self):
        hasCoronaryBypassConduit   = Property(EX_NS.hasCoronaryBypassConduit)

        ITALeft = EX.ITALeft
        ITALeft += (hasCoronaryBypassConduit|some|
                    EnumeratedClass(
                       members=[EX_NS.CoronaryBypassConduit_internal_thoracic_artery_left_insitu,
                                EX_NS.CoronaryBypassConduit_internal_thoracic_artery_left_free])) 
        from FuXi.DLP.DLNormalization import NormalFormReduction
        self.assertEquals(repr(Class(first(ITALeft.subSumpteeIds()))),"Some Class SubClassOf: Class: ex:ITALeft ")
        NormalFormReduction(self.ontGraph)
        self.assertEquals(repr(Class(first(ITALeft.subSumpteeIds()))),
                          "Some Class SubClassOf: Class: ex:ITALeft  . EquivalentTo: ( ( ex:hasCoronaryBypassConduit value ex:CoronaryBypassConduit_internal_thoracic_artery_left_insitu ) or ( ex:hasCoronaryBypassConduit value ex:CoronaryBypassConduit_internal_thoracic_artery_left_free ) )")

def Tb(owlGraph, _class, variable=Variable('X')):
    """
    DLP body (consequent knowledge assertional forms (ABox assertions,
    conjunction / disjunction of ABox assertions, and exisential role
    restriction assertions)
    These are all common EL++ templates for KR
    """
    props = list(set(owlGraph.predicates(subject=_class)))
    if OWL_NS.intersectionOf in props and not isinstance(_class, URIRef):
        for s, p, o in owlGraph.triples((_class, OWL_NS.intersectionOf, None)):
            conj = []
            handleConjunct(conj, owlGraph, o, variable)
            return And(conj)
    elif OWL_NS.unionOf in props and not isinstance(_class, URIRef):
        #http://www.w3.org/TR/owl-semantics/#owl_unionOf
        for s, p, o in owlGraph.triples((_class, OWL_NS.unionOf, None)):
            return Or([Tb(owlGraph, c, variable=variable)
                       for c in Collection(owlGraph, o)])
    elif OWL_NS.someValuesFrom in props:
        #http://www.w3.org/TR/owl-semantics/#owl_someValuesFrom
        prop = list(
            owlGraph.objects(subject=_class, predicate=OWL_NS.onProperty))[0]
        o = list(owlGraph.objects(
            subject=_class, predicate=OWL_NS.someValuesFrom))[0]
        newVar = Variable(BNode())
        # @FIXME: unused code
        # body = Uniterm(
        #    prop, [variable, newVar], newNss=owlGraph.namespaces())
        # head = Th(owlGraph, o, variable=newVar)
        return And(
            [Uniterm(prop, [variable, newVar], newNss=owlGraph.namespaces()),
             Tb(owlGraph, o, variable=newVar)])
    elif OWL_NS.hasValue in props:
        # http://www.w3.org/TR/owl-semantics/#owl_hasValue
        # Domain-specific rules for hasValue
        # Can be achieved via pD semantics
        prop = list(
            owlGraph.objects(subject=_class, predicate=OWL_NS.onProperty))[0]
        o = first(owlGraph.objects(subject=_class, predicate=OWL_NS.hasValue))
        return Uniterm(prop, [variable, o], newNss=owlGraph.namespaces())
    elif OWL_NS.complementOf in props:
        return Tc(
            owlGraph, first(owlGraph.objects(_class, OWL_NS.complementOf)))
    else:
        # simple class
        # "Named" Uniterm
        _classTerm = SkolemizeExistentialClasses(_class)
        return Uniterm(
            RDF.type, [variable, _classTerm], newNss=owlGraph.namespaces())

def ProperSipOrderWithNegation(body):
    """
    Ensures the list of literals has the negated literals
    at the end of the list
    """
    from FuXi.Rete.SidewaysInformationPassing import iterCondition

    # import pdb;pdb.set_trace()
    firstNegLiteral = None
    bodyIterator = list(body)
    for idx, literal in enumerate(bodyIterator):
        if literal.naf:
            firstNegLiteral = literal
            break
    if firstNegLiteral:
        # There is a first negative literal, are there subsequent positive literals?
        subsequentPosLits = first(itertools.dropwhile(lambda i: i.naf, bodyIterator[idx:]))
        if len(body) - idx > 1:
            # if this is not the last term in the body
            # then we succeed only if there are no subsequent positive literals
            return not subsequentPosLits
        else:
            # this is the last term, so we are successful
            return True
    else:
        # There are no negative literals
        return True