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Viewing file:     TurtleSerializer.py (6.01 KB)      -rw-r--r--
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import urlparse
from xml.sax.saxutils import escape, quoteattr

from rdflib.BNode import BNode
from rdflib.Literal import Literal
from rdflib.URIRef import URIRef
from rdflib.syntax.xml_names import split_uri 

from rdflib.syntax.serializers.RecursiveSerializer import RecursiveSerializer
from rdflib.exceptions import Error

from rdflib import RDF, RDFS

SUBJECT = 0
VERB = 1
OBJECT = 2



class TurtleSerializer(RecursiveSerializer):

    short_name="turtle"
    indentString = "    "
    def __init__(self, store):
        super(TurtleSerializer, self).__init__(store)
        self.reset()
        self.stream = None

    def reset(self):
        super(TurtleSerializer, self).reset()
        self._shortNames = {}
        self._started = False
    
    def getQName(self, uri):
        if isinstance(uri, URIRef):
            if self.base and uri.startswith(self.base):
                # this feels too simple, but I dont see why I wont work :) -Gunnar
                return "<%s>"%uri[len(self.base):]
            try:
                parts = self.store.compute_qname(uri)
            except Exception, e:
                parts = None
            if parts:
                
                prefix, namespace, local = parts
                if local.find(".")!=-1:
                    # Local parts with . will mess up serialization
                    return None
                
                self.addNamespace(prefix, namespace)
                return u"%s:%s" % (prefix, local)
        return None

    def preprocessTriple(self, triple):
        super(TurtleSerializer, self).preprocessTriple(triple)
        for node in triple:
            self.getQName(node)
        p = triple[1]
        if isinstance(p, BNode):
            self._references[p] = self.refCount(p) +1
            
    def label(self, node):
        qname = self.getQName(node)
        if qname is None:
            return node.n3()
        return qname

    def startDocument(self):
        self._started = True
        ns_list= list(self.store.namespaces())
        ns_list.sort()
        if len(ns_list) == 0:
            return
        
        for prefix, uri in ns_list:
            self.write('\n'+self.indent()+'@prefix %s: <%s>.'%(prefix, uri))
        self.write('\n')

    def endDocument(self):
        pass

    def isValidList(self,l): 
        """Checks if l is a valid RDF list, i.e. no nodes have other properties."""
        try:
            if not self.store.value(l, RDF.first):
                return False
        except: 
            return False
        while l:
            if l!=RDF.nil and len(list(self.store.predicate_objects(l)))!=2: return False
            l = self.store.value(l, RDF.rest)
        return True
        
    def doList(self,l):
        while l:
            item = self.store.value(l, RDF.first)
            if item:
                self.path(item, SUBJECT)
                self.subjectDone(l)
            l = self.store.value(l, RDF.rest)
            
    def p_squared(self, node, position):
        if (not isinstance(node, BNode)
            or node in self._serialized
            or self.refCount(node) > 1
            or position == SUBJECT):
            return False
       
        if self.isValidList(node): 
            # this is a list
            self.write(' (')
            self.depth+=2
            self.doList(node)
            self.depth-=2            
            self.write(' )')
            return True
        
        self.subjectDone(node)
        self.write(' [')
        self.depth += 2
        self.predicateList(node)
        self.depth -= 2
        self.write(']')
        return True

    def p_default(self, node, ignore):
        self.write(" "+self.label(node))
        return True
    
    def path(self, node, position):
        if not (self.p_squared(node, position)
                or self.p_default(node, position)):
            raise Error("Cannot serialize node '%s'"%(node, ))

    def verb(self, node):
        if node == RDF.type:
            self.write(' a')
        else:
            self.path(node, VERB)
    
    def objectList(self, objects):
        if len(objects) == 0:
            return

        self.path(objects[0], OBJECT)
        for obj in objects[1:]:
            self.write(',\n'+self.indent(2))
            self.path(obj, OBJECT)

    def predicateList(self, subject):
        properties = self.buildPredicateHash(subject)
        propList = self.sortProperties(properties)
        if len(propList) == 0:
            return

        self.verb(propList[0])
        self.objectList(properties[propList[0]])
        for predicate in propList[1:]:
            self.write(';\n'+self.indent(1))
            self.verb(predicate)
            self.objectList(properties[predicate])

    def s_squared(self, subject):
        if (self.refCount(subject) > 0) or not isinstance(subject, BNode):
            return False
        self.write('\n'+self.indent()+" [")
        self.depth+=1
        self.predicateList(subject)
        self.depth-=1
        self.write('].')
        return True

    def s_default(self, subject):
        self.write('\n'+self.indent())
        self.path(subject, SUBJECT)
        self.predicateList(subject)
        self.write('. ')
        return True
    
    def statement(self, subject):
        self.subjectDone(subject)
        if not self.s_squared(subject):
            self.s_default(subject)
            

    def serialize(self, stream, base=None, encoding=None, **args):
        self.reset()
        self.stream = stream
        self.base=base
        
        # In newer rdflibs these are always in the namespace manager
        #self.store.prefix_mapping('rdf', RDFNS)
        #self.store.prefix_mapping('rdfs', RDFSNS)
        
        self.preprocess()
        subjects_list = self.orderSubjects()

        self.startDocument()

        firstTime = True
        for subject in subjects_list:
            if not self.isDone(subject):
                if firstTime:
                    firstTime = False
                else:
                    self.write('\n')
                self.statement(subject)
        
        self.endDocument()

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