def _addOptionalVars(rows, query):
"""augment the rows with 'x':None values for any query
variable x that happened not to be bound in that row. This is
for consistency with rdflib's sparql results, which always
include all the vars in their result tuple.
The parseJsonResults (and parseSparqlResults) version totally
has the information to do this itself, but it seemed easier to
write it here. This second pass might be a little bit slower.
rows are edited in-place, and then returned.
"""
vars = [v.strip('?') for v in sparqlSelection(query)]
for row in rows:
for v in vars:
if v not in row:
row[v] = None
return rows
def _addOptionalVars(rows, query):
"""augment the rows with 'x':None values for any query
variable x that happened not to be bound in that row. This is
for consistency with rdflib's sparql results, which always
include all the vars in their result tuple.
The parseJsonResults (and parseSparqlResults) version totally
has the information to do this itself, but it seemed easier to
write it here. This second pass might be a little bit slower.
rows are edited in-place, and then returned.
"""
vars = [v.strip('?') for v in sparqlSelection(query)]
for row in rows:
for v in vars:
if v not in row:
row[v] = None
return rows
def interpolateSparql(query, initBindings):
"""expand the bindings into the query string to make one
standalone query. Very sloppy; probably gets quoting wrong.
>>> interpolateSparql('SELECT ?x { ?x ?y ?z }', {Variable('?z') : Literal('hi')})
u'SELECT ?x { ?x ?y "hi" }'
>>> interpolateSparql('SELECT ?x { ?x <http://example/?z=1> ?z }', {Variable('?z') : Literal('hi')})
u'SELECT ?x { ?x <http://example/?z=1> "hi" }'
"""
prolog = query[:query.find('{')]
text = query[query.find('{'):]
selection = sparqlSelection(query)
# print "Sel is", selection
for var, value in initBindings.items():
# i can't seem to handle various versions of rdflib and
# Variables that have or don't have leading ?
var = var.lstrip('?')
if '?' + var not in selection:
# hopefully you don't have spaces in your urls, and you do
# have spaces on both sides of all variable names
text = text.replace(' ?%s ' % var, ' %s ' % value.n3())
query = prolog + text
# print "Expand to", query
return query
def interpolateSparql(query, initBindings):
"""expand the bindings into the query string to make one
standalone query. Very sloppy; probably gets quoting wrong.
>>> interpolateSparql('SELECT ?x { ?x ?y ?z }', {Variable('?z') : Literal('hi')})
u'SELECT ?x { ?x ?y "hi" }'
>>> interpolateSparql('SELECT ?x { ?x <http://example/?z=1> ?z }', {Variable('?z') : Literal('hi')})
u'SELECT ?x { ?x <http://example/?z=1> "hi" }'
"""
prolog = query[:query.find('{')]
text = query[query.find('{'):]
selection = sparqlSelection(query)
# print "Sel is", selection
for var, value in initBindings.items():
# i can't seem to handle various versions of rdflib and
# Variables that have or don't have leading ?
var = var.lstrip('?')
if '?' + var not in selection:
# hopefully you don't have spaces in your urls, and you do
# have spaces on both sides of all variable names
text = text.replace(' ?%s ' % var, ' %s ' % value.n3())
query = prolog + text
# print "Expand to", query
return query