Merge pull request #387 from bcogrel/ttl-bool

Bad boolean list serialization to Turtle

rdflib/plugins/serializers/turtle.py

@@ -359,7 +359,7 @@ def isValidList(self, l):
     def doList(self, l):
         while l:
             item = self.store.value(l, RDF.first)
-            if item:
+            if item is not None:
                 self.path(item, OBJECT)
                 self.subjectDone(l)
             l = self.store.value(l, RDF.rest)

test/test_turtle_serialize.py

@@ -1,19 +1,45 @@
-import rdflib
+from rdflib import Graph, URIRef, BNode, RDF, Literal
+from rdflib.collection import Collection
 from rdflib.py3compat import b
 
+
 def testTurtleFinalDot(): 
     """
     https://github.com/RDFLib/rdflib/issues/282
     """
 
-    g = rdflib.Graph()
-    u = rdflib.URIRef("http://ex.org/bob.")
+    g = Graph()
+    u = URIRef("http://ex.org/bob.")
     g.bind("ns", "http://ex.org/")
     g.add( (u, u, u) )
     s=g.serialize(format='turtle')
     assert b("ns:bob.") not in s
 
 
+def testTurtleBoolList():
+    subject = URIRef("http://localhost/user")
+    predicate = URIRef("http://localhost/vocab#hasList")
+    g1 = Graph()
+    list_item1 = BNode()
+    list_item2 = BNode()
+    list_item3 = BNode()
+    g1.add((subject, predicate, list_item1))
+    g1.add((list_item1, RDF.first, Literal(True)))
+    g1.add((list_item1, RDF.rest, list_item2))
+    g1.add((list_item2, RDF.first, Literal(False)))
+    g1.add((list_item2, RDF.rest, list_item3))
+    g1.add((list_item3, RDF.first, Literal(True)))
+    g1.add((list_item3, RDF.rest, RDF.nil))
+
+    ttl_dump = g1.serialize(format="turtle")
+    g2 = Graph()
+    g2.parse(data=ttl_dump, format="turtle")
+
+    list_id = g2.value(subject, predicate)
+    bool_list = [i.toPython() for i in Collection(g2, list_id)]
+    assert bool_list == [True, False, True]
+
+
 if __name__ == "__main__":
     import nose, sys
     nose.main(defaultTest=sys.argv[0])