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from rdflib import RDF, Graph, Namespace
EX = Namespace("http://example.org/")
def test_items():
g = Graph().parse(
data="""
@prefix : <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
<> :value (
<http://example.org/thing1>
<http://example.org/thing2>
).
<> :value (
<http://example.org/thing3>
).
<> :value ().
<> :value (
<http://example.org/thing4>
<http://example.org/thing5>
<http://example.org/thing6>
).
""",
format="turtle",
)
values = {tuple(g.items(v)) for v in g.objects(None, RDF.value)}
assert values == {
(EX.thing1, EX.thing2),
(EX.thing3,),
(),
(EX.thing4, EX.thing5, EX.thing6),
}
def test_recursive_list_detection():
g = Graph().parse(
data="""
@prefix : <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
<> :value _:a .
_:a :first "turtles"; :rest _:a .
<> :value [ :first "turtles"; :rest _:b ] .
_:b :first "all the way down"; :rest _:b .
<> :value [ :first "turtles"; :rest _:c ] .
_:c :first "all the way down"; :rest _:a .
""",
format="turtle",
)
for v in g.objects(None, RDF.value):
try:
list(g.items(v))
except ValueError as e: # noqa: F841
pass
else:
assert False, "Expected detection of recursive rdf:rest reference"
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