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Reset graph on exit from context #1206

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Dec 27, 2020
Merged

Reset graph on exit from context #1206

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c27da15
Reset graph on exit from context
sa-bpelakh Dec 1, 2020
80fa7da
slightly more standard Turtle & SPARQL syntax
nicholascar Dec 27, 2020
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3 changes: 3 additions & 0 deletions rdflib/plugins/sparql/evaluate.py
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Original file line number Diff line number Diff line change
Expand Up @@ -187,6 +187,7 @@ def evalGraph(ctx, part):

ctx = ctx.clone()
graph = ctx[part.term]
prev_graph = ctx.graph
if graph is None:

for graph in ctx.dataset.contexts():
Expand All @@ -199,11 +200,13 @@ def evalGraph(ctx, part):
c = c.push()
graphSolution = [{part.term: graph.identifier}]
for x in _join(evalPart(c, part.p), graphSolution):
x.ctx.graph = prev_graph
yield x

else:
c = ctx.pushGraph(ctx.dataset.get_context(graph))
for x in evalPart(c, part.p):
x.ctx.graph = prev_graph
yield x


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34 changes: 33 additions & 1 deletion test/test_sparql.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
from rdflib import Graph, URIRef, Literal, BNode
from rdflib import Graph, URIRef, Literal, BNode, ConjunctiveGraph
from rdflib.namespace import Namespace, RDF, RDFS
from rdflib.plugins.sparql import prepareQuery
from rdflib.compare import isomorphic

Expand Down Expand Up @@ -112,6 +113,37 @@ def test_sparql_update_with_bnode_serialize_parse():
assert not raised


def test_named_filter_graph_query():
g = ConjunctiveGraph()
g.namespace_manager.bind('rdf', RDF)
g.namespace_manager.bind('rdfs', RDFS)
ex = Namespace('https://ex.com/')
g.namespace_manager.bind('ex', ex)
g.get_context(ex.g1).parse(format="turtle", data=f"""
prefix ex: <https://ex.com/>
prefix rdfs: <{str(RDFS)}>
ex:Boris rdfs:label "Boris" .
ex:Susan rdfs:label "Susan" .
""")
g.get_context(ex.g2).parse(format="turtle", data="""
prefix ex: <https://ex.com/>
ex:Boris a ex:Person .
""")

assert list(g.query("select ?l where { graph ex:g1 { ?a rdfs:label ?l } ?a a ?type }",
initNs={'ex': ex})) == [(Literal('Boris'),)]
assert list(g.query("select ?l where { graph ex:g1 { ?a rdfs:label ?l } filter exists { ?a a ?type }}",
initNs={'ex': ex})) == [(Literal('Boris'),)]
assert list(g.query("select ?l where { graph ex:g1 { ?a rdfs:label ?l } filter not exists { ?a a ?type }}",
initNs={'ex': ex})) == [(Literal('Susan'),)]
assert list(g.query("select ?l where { graph ?g { ?a rdfs:label ?l } ?a a ?type }",
initNs={'ex': ex})) == [(Literal('Boris'),)]
assert list(g.query("select ?l where { graph ?g { ?a rdfs:label ?l } filter exists { ?a a ?type }}",
initNs={'ex': ex})) == [(Literal('Boris'),)]
assert list(g.query("select ?l where { graph ?g { ?a rdfs:label ?l } filter not exists { ?a a ?type }}",
initNs={'ex': ex})) == [(Literal('Susan'),)]


if __name__ == "__main__":
import nose

Expand Down