def extract(context: TemporalAttributeParsingContext, xml_element) -> typing.Optional[Fraction]:
dur_raw = xml_element.attrib.get(DurAttribute.qn)
try:
return utils.parse_time_expression(context.tick_rate, context.frame_rate, dur_raw) if dur_raw is not None else None
except ValueError:
LOGGER.error("bad dur value")
return None
def test_bad_syntax(self):
with self.assertRaises(ValueError):
parse_time_expression(60, 24, "100:00:00;01")
def test_bad_frame_count(self):
with self.assertRaises(ValueError):
parse_time_expression(None, 24, "100:00:00:100")
def test_timing_expressions(self):
for test in self.tests:
with self.subTest(test[0]):
c = parse_time_expression(test[2], test[1], test[0])
self.assertEqual(c, test[3])
self.assertTrue(isinstance(c, Fraction))