def test_field_output(self):
a = Field('a', 8)
b = Sequence('b', [a])
lookup = ResultParameters([b])
self.assertEqual([Param('result', Param.OUT, EntryType(a))], lookup.get_params(a))
self.assertEqual([Param('magic unknown param', Param.OUT, EntryType(a))], lookup.get_passed_variables(b, b.children[0]))
self.assertEqual([Param('result', Param.OUT, EntryType(b))], lookup.get_params(b))
def test_hidden_entry_visible_child(self):
# If an entry is hidden, but it has visible children, we want the entry
# to be hidden regardless.
a = Field('a', 8)
b = Sequence('', [a])
lookup = ResultParameters([b])
self.assertEqual([], lookup.get_params(b))
self.assertEqual([], lookup.get_params(a))
def test_visible_common_in_hidden_context(self):
a = Field('a', 8)
b = Sequence('b:', [a])
lookup = ResultParameters([a, b])
self.assertEqual([Param('result', Param.OUT, EntryType(a))],
lookup.get_params(a))
self.assertEqual([], lookup.get_params(b))
self.assertEqual([Local('unused a', EntryType(a))], lookup.get_locals(b))
self.assertEqual([Param('unused a', Param.OUT, EntryType(a))],
lookup.get_passed_variables(b, b.children[0]))
def test_sequence_value(self):
a = Field('a:', 8, Field.INTEGER)
b = Sequence('b', [a], parse('${a:}'))
lookup = ResultParameters([b])
self.assertEqual([], lookup.get_params(a))
self.assertEqual([Param('result', Param.OUT, EntryType(b))],
lookup.get_params(b))
self.assertEqual([], lookup.get_locals(a))
self.assertEqual([], lookup.get_locals(b))
self.assertEqual([], lookup.get_passed_variables(b, b.children[0]))
def test_hidden_reference(self):
# Test a visible common reference that is hidden through its reference
# name. This is common for integers defined at the common level.
#
# Note that in this case 'b' won't have an output, because all of the
# fields it defines are hidden, and so doesn't have a type itself.
a = Field('a', 8, Field.INTEGER)
b = Sequence('b', [Child('a:', a)])
lookup = ResultParameters([a, b])
self.assertEqual([Param('result', Param.OUT, EntryType(a))], lookup.get_params(a))
self.assertEqual([], lookup.get_params(b))
self.assertEqual([Local('unused a:', EntryType(a))], lookup.get_locals(b))
self.assertEqual([Param('unused a:', Param.OUT, EntryType(a))], lookup.get_passed_variables(b, b.children[0]))
def test_recursive_common(self):
# Test a recursive parser to decode xml style data
embedded = Sequence('embedded', [])
digit = Field('data', 8, constraints=[Minimum(ord('0')), Maximum(ord('9'))])
item = Choice('item', [embedded, digit])
embedded.children = [
Field('', length=8, format=Field.TEXT, constraints=[Equals('<')]),
item,
Field('', length=8, format=Field.TEXT, constraints=[Equals('>')])]
# Lets just test that we can decode things correctly...
list(item.decode(Data('8')))
list(item.decode(Data('<5>')))
list(item.decode(Data('<<7>>')))
self.assertRaises(bdec.DecodeError, list, item.decode(Data('a')))
self.assertRaises(bdec.DecodeError, list, item.decode(Data('<5')))
lookup = ResultParameters([item])
self.assertEqual([Param('result', Param.OUT, EntryType(item))], lookup.get_params(item))
self.assertEqual([Param('result', Param.OUT, EntryType(embedded))], lookup.get_params(embedded))
def test_hidden_field(self):
a = Field('', 8)
lookup = ResultParameters([a])
self.assertEqual([], lookup.get_params(a))
