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from decimal import Decimal
import unittest
from rdflib import Graph, Namespace, URIRef, Literal, XSD
from rdflib.compare import to_isomorphic
class TestIssue655(unittest.TestCase):
def test_issue655(self):
# make sure that inf and nan are serialized correctly
dt = XSD['double'].n3()
self.assertEqual(
Literal(float("inf"))._literal_n3(True),
'"INF"^^%s' % dt
)
self.assertEqual(
Literal(float("-inf"))._literal_n3(True),
'"-INF"^^%s' % dt
)
self.assertEqual(
Literal(float("nan"))._literal_n3(True),
'"NaN"^^%s' % dt
)
dt = XSD['decimal'].n3()
self.assertEqual(
Literal(Decimal("inf"))._literal_n3(True),
'"INF"^^%s' % dt
)
self.assertEqual(
Literal(Decimal("-inf"))._literal_n3(True),
'"-INF"^^%s' % dt
)
self.assertEqual(
Literal(Decimal("nan"))._literal_n3(True),
'"NaN"^^%s' % dt
)
self.assertEqual(
Literal("inf", datatype=XSD['decimal'])._literal_n3(True),
'"INF"^^%s' % dt
)
# assert that non-numerical aren't changed
self.assertEqual(
Literal('inf')._literal_n3(True),
'"inf"'
)
self.assertEqual(
Literal('nan')._literal_n3(True),
'"nan"'
)
PROV = Namespace('http://www.w3.org/ns/prov#')
bob = URIRef("http://example.org/object/Bob")
# g1 is a simple graph with an infinite and a nan values
g1 = Graph()
g1.add((bob, PROV.value, Literal(float("inf"))))
g1.add((bob, PROV.value, Literal(float("nan"))))
# Build g2 out of the deserialisation of g1 serialisation
g2 = Graph()
g2.parse(data=g1.serialize(format='turtle'), format='turtle')
self.assertTrue(to_isomorphic(g1) == to_isomorphic(g2))
if __name__ == "__main__":
unittest.main()
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