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import re
import rdflib
TRIPLE = (
rdflib.URIRef("http://example.com/s"),
rdflib.RDFS.label,
rdflib.Literal("example 1"),
)
def test_empty():
g = rdflib.Graph()
s = g.serialize(format="trig")
assert s is not None
def test_repeat_triples():
g = rdflib.Dataset()
g.get_context("urn:a").add(
(rdflib.URIRef("urn:1"), rdflib.URIRef("urn:2"), rdflib.URIRef("urn:3"))
)
g.get_context("urn:b").add(
(rdflib.URIRef("urn:1"), rdflib.URIRef("urn:2"), rdflib.URIRef("urn:3"))
)
assert len(g.get_context("urn:a")) == 1
assert len(g.get_context("urn:b")) == 1
s = g.serialize(format="trig", encoding="latin-1")
assert b"{}" not in s # no empty graphs!
def test_same_subject():
g = rdflib.Dataset()
g.get_context("urn:a").add(
(rdflib.URIRef("urn:1"), rdflib.URIRef("urn:p1"), rdflib.URIRef("urn:o1"))
)
g.get_context("urn:b").add(
(rdflib.URIRef("urn:1"), rdflib.URIRef("urn:p2"), rdflib.URIRef("urn:o2"))
)
assert len(g.get_context("urn:a")) == 1
assert len(g.get_context("urn:b")) == 1
s = g.serialize(format="trig", encoding="latin-1")
assert len(re.findall(b"p1", s)) == 1
assert len(re.findall(b"p2", s)) == 1
assert b"{}" not in s # no empty graphs!
def test_remember_namespace():
g = rdflib.Dataset()
g.add(TRIPLE + (rdflib.URIRef("http://example.com/graph1"),))
# In 4.2.0 the first serialization would fail to include the
# prefix for the graph but later serialize() calls would work.
first_out = g.serialize(format="trig", encoding="latin-1")
second_out = g.serialize(format="trig", encoding="latin-1")
assert b"@prefix ns1: <http://example.com/> ." not in second_out
assert b"@prefix ns1: <http://example.com/> ." not in first_out
def test_graph_qname_syntax():
g = rdflib.Dataset()
g.add(TRIPLE + (rdflib.URIRef("http://example.com/graph1"),))
out = g.serialize(format="trig", encoding="latin-1")
assert b"ns1:graph1 {" not in out
def test_graph_uri_syntax():
g = rdflib.Dataset()
# getQName will not abbreviate this, so it should serialize as
# a '<...>' term.
g.add(TRIPLE + (rdflib.URIRef("http://example.com/foo."),))
out = g.serialize(format="trig", encoding="latin-1")
assert b"<http://example.com/foo.> {" in out
def test_blank_graph_identifier():
g = rdflib.Dataset()
g.add(TRIPLE + (rdflib.BNode(),))
out = g.serialize(format="trig", encoding="latin-1")
graph_label_line = out.splitlines()[-4]
assert re.match(rb"^_:[a-zA-Z0-9]+ \{", graph_label_line)
def test_graph_parsing():
# should parse into single default graph context
data = """
<http://example.com/thing#thing_a> <http://example.com/knows> <http://example.com/thing#thing_b> .
"""
g = rdflib.Dataset()
g.parse(data=data, format="trig")
assert len(list(g.contexts())) == 1
# should parse into single default graph context
data = """
<http://example.com/thing#thing_a> <http://example.com/knows> <http://example.com/thing#thing_b> .
{ <http://example.com/thing#thing_c> <http://example.com/knows> <http://example.com/thing#thing_d> . }
"""
g = rdflib.Dataset()
g.parse(data=data, format="trig")
assert len(list(g.contexts())) == 1
# should parse into 2 contexts, one default, one named
data = """
<http://example.com/thing#thing_a> <http://example.com/knows> <http://example.com/thing#thing_b> .
{ <http://example.com/thing#thing_c> <http://example.com/knows> <http://example.com/thing#thing_d> . }
<http://example.com/graph#graph_a> {
<http://example.com/thing/thing_e> <http://example.com/knows> <http://example.com/thing#thing_f> .
}
"""
g = rdflib.Dataset()
g.parse(data=data, format="trig")
assert len(list(g.contexts())) == 2
def test_round_trips():
data = """
<http://example.com/thing#thing_a> <http://example.com/knows> <http://example.com/thing#thing_b> .
{ <http://example.com/thing#thing_c> <http://example.com/knows> <http://example.com/thing#thing_d> . }
<http://example.com/graph#graph_a> {
<http://example.com/thing/thing_e> <http://example.com/knows> <http://example.com/thing#thing_f> .
}
"""
g = rdflib.Dataset()
for i in range(5):
g.parse(data=data, format="trig")
data = g.serialize(format="trig")
# output should only contain 1 mention of each resource/graph name
assert data.count("thing_a") == 1
assert data.count("thing_b") == 1
assert data.count("thing_c") == 1
assert data.count("thing_d") == 1
assert data.count("thing_e") == 1
assert data.count("thing_f") == 1
assert data.count("graph_a") == 1
def test_default_graph_serializes_without_name():
data = """
<http://example.com/thing#thing_a> <http://example.com/knows> <http://example.com/thing#thing_b> .
{ <http://example.com/thing#thing_c> <http://example.com/knows> <http://example.com/thing#thing_d> . }
"""
g = rdflib.Dataset()
g.parse(data=data, format="trig")
data = g.serialize(format="trig", encoding="latin-1")
assert b"None" not in data
def test_prefixes():
data = """
@prefix ns1: <http://ex.org/schema#> .
<http://ex.org/docs/document1> = {
ns1:Person_A a ns1:Person ;
ns1:TextSpan "Simon" .
}
<http://ex.org/docs/document2> = {
ns1:Person_C a ns1:Person ;
ns1:TextSpan "Agnes" .
}
"""
cg = rdflib.Dataset()
cg.parse(data=data, format="trig")
data = cg.serialize(format="trig", encoding="latin-1")
assert "ns2: <http://ex.org/docs/".encode("latin-1") not in data, data
assert "<ns2:document1>".encode("latin-1") not in data, data
assert "ns2:document1".encode("latin-1") not in data, data
def test_issue_2154():
ds = rdflib.Dataset()
sg = ds.serialize(format="trig")
assert "prefix" not in sg, sg
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