def get_type(self, type_name: str) -> interfaces.objects.Template:
"""Resolves a symbol name into an object template.
This always construct a new python object, rather than using a
cached value otherwise changes made later may affect the cached
copy. Calling clone after every native type construction was
extremely slow.
"""
# NOTE: These need updating whenever the object init signatures change
prefix = ""
if constants.BANG in type_name:
name_split = type_name.split(constants.BANG)
if len(name_split) > 2:
raise ValueError(
"SymbolName cannot contain multiple {} separators".format(
constants.BANG))
table_name, type_name = name_split
prefix = table_name + constants.BANG
additional = {} # type: Dict[str, Any]
obj = None # type: Optional[Type[interfaces.objects.ObjectInterface]]
if type_name == 'void' or type_name == 'function':
obj = objects.Void
elif type_name == 'array':
obj = objects.Array
additional = {"count": 0, "subtype": self.get_type('void')}
elif type_name == 'enum':
obj = objects.Enumeration
additional = {"base_type": self.get_type('void'), "choices": {}}
elif type_name == 'bitfield':
obj = objects.BitField
additional = {
"start_bit": 0,
"end_bit": 0,
"base_type": self.get_type('void')
}
elif type_name == 'string':
obj = objects.String
additional = {"max_length": 0}
elif type_name == 'bytes':
obj = objects.Bytes
additional = {"length": 0}
if obj is not None:
return objects.templates.ObjectTemplate(obj,
type_name=prefix +
type_name,
**additional)
_native_type, native_format = self._native_dictionary[type_name]
if type_name == 'pointer':
additional = {'subtype': self.get_type('void')}
return objects.templates.ObjectTemplate(
self.get_type_class(type_name), # pylint: disable=W0142
type_name=prefix + type_name,
data_format=objects.DataFormatInfo(*native_format),
**additional)
def get_key(self) -> str:
"""Returns the Key value as a 4 character string"""
tag_bytes = objects.convert_value_to_data(
self.Key, int, objects.DataFormatInfo(4, "little", False))
return "".join([chr(x) if 32 < x < 127 else '' for x in tag_bytes])