def evalUpdate(graph, update):
"""
http://www.w3.org/TR/sparql11-update/#updateLanguage
'A request is a sequence of operations [...] Implementations MUST
ensure that operations of a single request are executed in a
fashion that guarantees the same effects as executing them in
lexical order.
Operations all result either in success or failure.
If multiple operations are present in a single request, then a
result of failure from any operation MUST abort the sequence of
operations, causing the subsequent operations to be ignored.'
This will return None on success and raise Exceptions on error
"""
for u in update:
ctx = QueryContext(graph)
ctx.prologue=u.prologue
try:
if u.name == 'Load':
evalLoad(ctx, u)
elif u.name == 'Clear':
evalClear(ctx, u)
elif u.name == 'Drop':
# rdflib does not record empty graphs, so clear == drop
evalClear(ctx, u)
elif u.name == 'Create':
evalCreate(ctx, u)
elif u.name == 'Add':
evalAdd(ctx, u)
elif u.name == 'Move':
evalMove(ctx, u)
elif u.name == 'Copy':
evalCopy(ctx, u)
elif u.name == 'InsertData':
evalInsertData(ctx, u)
elif u.name == 'DeleteData':
evalDeleteData(ctx, u)
elif u.name == 'DeleteWhere':
evalDeleteWhere(ctx, u)
elif u.name == 'Modify':
evalModify(ctx, u)
else:
raise Exception('Unknown update operation: %s' % (u,))
except:
if not u.silent:
raise
def _eval(e, ctx=None):
if not ctx:
ctx = QueryContext()
try:
r = e.eval(ctx)
if isinstance(r, SPARQLError):
print r
return False
return r
except SPARQLError:
return False
def test_comparisons_var():
ctx = QueryContext()
ctx[Variable('x')] = Literal(2)
eq(bool(_eval(_translate((p.Expression.parseString('?x<3')[0])), ctx)), True)
eq(bool(_eval(_translate((p.Expression.parseString('?x<3.0')[0])), ctx)), True)
eq(bool(_eval(_translate((p.Expression.parseString('?x<3e0')[0])), ctx)), True)
eq(bool(_eval(_translate((p.Expression.parseString('?x<2.1')[0])), ctx)), True)
eq(bool(_eval(_translate((p.Expression.parseString('?x<21e-1')[0])), ctx)), True)
eq(bool(_eval(_translate((p.Expression.parseString('?x=2.0')[0])), ctx)), True)
eq(bool(_eval(_translate((p.Expression.parseString('?x=2e0')[0])), ctx)), True)
eq(bool(_eval(_translate((p.Expression.parseString('?x="cake"')[0])), ctx)), False)
ctx = QueryContext()
ctx[Variable('x')] = Literal(4)
eq(bool(_eval(_translate((p.Expression.parseString('?x<3')[0])), ctx)), False)
eq(bool(_eval(_translate((p.Expression.parseString('?x<3.0')[0])), ctx)), False)
eq(bool(_eval(_translate((p.Expression.parseString('?x<3e0')[0])), ctx)), False)
def test_arithmetic_var():
ctx = QueryContext()
ctx[Variable('x')] = Literal(2)
eq(_eval(_translate((p.Expression.parseString('2+?x')[0])), ctx).value, 4)
eq(_eval(_translate((p.Expression.parseString('?x+3')[0])), ctx).value, 5)
eq(_eval(_translate((p.Expression.parseString('3-?x')[0])), ctx).value, 1)
eq(_eval(_translate((p.Expression.parseString('?x*3')[0])), ctx).value, 6)
eq(_eval(_translate((p.Expression.parseString('4/?x')[0])), ctx).value, 2)
eq(_eval(_translate((p.Expression.parseString('?x+?x+?x')[0])), ctx).value, 6)
eq(_eval(_translate((p.Expression.parseString('?x-?x+?x')[0])), ctx).value, 2)
eq(_eval(_translate((p.Expression.parseString('(?x-?x)+?x')[0])), ctx).value, 2)
eq(_eval(_translate((p.Expression.parseString('?x-(?x+?x)')[0])), ctx).value, -2)
eq(_eval(_translate((p.Expression.parseString('?x*?x*?x')[0])), ctx).value, 8)
eq(_eval(_translate((p.Expression.parseString('4/?x*?x')[0])), ctx).value, 4)
eq(_eval(_translate((p.Expression.parseString('8/4*?x')[0])), ctx).value, 4)
eq(_eval(_translate((p.Expression.parseString('8/(4*?x)')[0])), ctx).value, 1)
eq(_eval(_translate((p.Expression.parseString('(?x/?x)*?x')[0])), ctx).value, 2)
eq(_eval(_translate((p.Expression.parseString('4/(?x*?x)')[0])), ctx).value, 1)
def evalUpdate(graph, update, initBindings=None):
"""
http://www.w3.org/TR/sparql11-update/#updateLanguage
'A request is a sequence of operations [...] Implementations MUST
ensure that operations of a single request are executed in a
fashion that guarantees the same effects as executing them in
lexical order.
Operations all result either in success or failure.
If multiple operations are present in a single request, then a
result of failure from any operation MUST abort the sequence of
operations, causing the subsequent operations to be ignored.'
This will return None on success and raise Exceptions on error
"""
for u in update:
ctx = QueryContext(graph)
ctx.prologue = u.prologue
if initBindings:
for k, v in initBindings.iteritems():
if not isinstance(k, Variable):
k = Variable(k)
ctx[k] = v
ctx.push() # nescessary?
try:
if u.name == 'Load':
evalLoad(ctx, u)
elif u.name == 'Clear':
evalClear(ctx, u)
elif u.name == 'Drop':
# rdflib does not record empty graphs, so clear == drop
evalClear(ctx, u)
elif u.name == 'Create':
evalCreate(ctx, u)
elif u.name == 'Add':
evalAdd(ctx, u)
elif u.name == 'Move':
evalMove(ctx, u)
elif u.name == 'Copy':
evalCopy(ctx, u)
elif u.name == 'InsertData':
evalInsertData(ctx, u)
elif u.name == 'DeleteData':
evalDeleteData(ctx, u)
elif u.name == 'DeleteWhere':
evalDeleteWhere(ctx, u)
elif u.name == 'Modify':
evalModify(ctx, u)
else:
raise Exception('Unknown update operation: %s' % (u, ))
except:
if not u.silent:
raise
def evalQuery(graph, query, initBindings, base=None):
ctx = QueryContext(graph)
ctx.prologue = query.prologue
if initBindings:
for k, v in initBindings.iteritems():
if not isinstance(k, Variable):
k = Variable(k)
ctx[k] = v
ctx.push() # nescessary?
main = query.algebra
# import pdb; pdb.set_trace()
if main.datasetClause:
if ctx.dataset is None:
raise Exception("Non-conjunctive-graph doesn't know about " +
"graphs! Try a query without FROM (NAMED).")
ctx = ctx.clone() # or push/pop?
firstDefault = False
for d in main.datasetClause:
if d.default:
if firstDefault:
# replace current default graph
dg = ctx.dataset.get_context(BNode())
ctx.pushGraph(dg)
firstDefault = True
ctx.load(d.default, default=True)
elif d.named:
g = d.named
ctx.load(g, default=False)
return evalPart(ctx, main)
def evalQuery(graph, query, initBindings, base=None):
ctx = QueryContext(graph)
ctx.prologue = query.prologue
if initBindings:
for k, v in initBindings.iteritems():
if not isinstance(k, Variable):
k = Variable(k)
ctx[k] = v
ctx.push() # nescessary?
main = query.algebra
# import pdb; pdb.set_trace()
if main.datasetClause:
if ctx.dataset is None:
raise Exception(
"Non-conjunctive-graph doesn't know about " +
"graphs! Try a query without FROM (NAMED).")
ctx = ctx.clone() # or push/pop?
firstDefault = False
for d in main.datasetClause:
if d.default:
if firstDefault:
# replace current default graph
dg = ctx.dataset.get_context(BNode())
ctx.pushGraph(dg)
firstDefault = True
ctx.load(d.default, default=True)
elif d.named:
g = d.named
ctx.load(g, default=False)
return evalPart(ctx, main)