def check_select(self, path, expected, context=None):
"""
Checks the materialized result of the *select* method with an XPath expression.
The selection is applied on the root token of the parsed XPath expression.
:param path: an XPath expression.
:param expected: the expected result. Can be a data instance to compare to the result, \
a function that accepts the result as argument and returns a boolean value, an exception \
class that is raised by running the evaluate method.
:param context: an optional `XPathContext` instance to be passed to evaluate method. If no \
context is provided the method is called with a dummy context.
"""
if context is None:
context = XPathContext(root=self.etree.Element(u'dummy_root'))
else:
context = context.copy()
root_token = self.parser.parse(path)
if isinstance(expected, type) and issubclass(expected, Exception):
self.assertRaises(expected, root_token.select, context)
elif isinstance(expected, list):
self.assertListEqual(list(root_token.select(context)), expected)
elif isinstance(expected, set):
self.assertEqual(set(root_token.select(context)), expected)
elif not callable(expected):
self.assertEqual(list(root_token.select(context)), expected)
else:
self.assertTrue(
expected(list(root_token.parse(path).select(context))))
def __call__(self,
elem,
value=None,
source=None,
namespaces=None,
**kwargs):
if value is not None:
self.parser.variables['value'] = self.base_type.text_decode(value)
if not self.parser.is_schema_bound():
self.parser.schema.bind_parser(self.parser)
if source is None:
context = XPathContext(root=elem)
else:
context = XPathContext(root=source.root, item=elem)
default_namespace = self.parser.namespaces['']
if namespaces and '' in namespaces:
self.parser.namespaces[''] = namespaces['']
try:
if not self.token.evaluate(context.copy()):
msg = "expression is not true with test path %r."
yield XMLSchemaValidationError(self,
obj=elem,
reason=msg % self.path)
except ElementPathError as err:
yield XMLSchemaValidationError(self, obj=elem, reason=str(err))
self.parser.namespaces[''] = default_namespace
