def test_items(self):
actual = parse("items")
expected = (trait("items", optional=True)
| dict_items(optional=True)
| list_items(optional=True)
| set_items(optional=True))
self.assertEqual(actual, expected)
def test_items_not_notify(self):
actual = parse("items:attr")
expected = (trait("items", notify=False, optional=True)
| dict_items(notify=False, optional=True)
| list_items(notify=False, optional=True)
| set_items(notify=False, optional=True)).trait("attr")
self.assertEqual(actual, expected)
def _handle_items(trees, default_notifies):
""" Handle keyword "items".
Parameters
----------
trees : list of lark.tree.Tree
The children tree for the "items" rule.
It should be empty.
default_notifies : list of boolean
The notify flag stack.
Returns
-------
expression : ObserverExpression
"""
if trees:
# Nothing should be wrapped in items
raise ValueError("Unexpected tree: {!r}".format(trees))
notify = default_notifies[-1]
return reduce(operator.or_, (
expression_module.trait("items", notify=notify, optional=True),
expression_module.dict_items(notify=notify, optional=True),
expression_module.list_items(notify=notify, optional=True),
expression_module.set_items(notify=notify, optional=True),
))
def test_list_items_optional_true(self):
expr = expression.list_items(optional=True)
expected = [
create_graph(ListItemObserver(notify=True, optional=True), ),
]
actual = expr._as_graphs()
self.assertEqual(actual, expected)
def test_list_items_method_optional(self):
# Test the instance method calls the top-level function correctly.
expr = expression.list_items().list_items(optional=True)
expected = [
create_graph(
ListItemObserver(notify=True, optional=False),
ListItemObserver(notify=True, optional=True),
),
]
actual = expr._as_graphs()
self.assertEqual(actual, expected)