def facade_factory(stream):
'''
Generate a facade class (we need a class so that we can register as
a subclass of the correct stream interface).
'''
class Facade(object):
__slots__ = ['_Facade__stream', '_Facade__memory', '__weakref__']
def __init__(self, stream, memory):
self.__stream = stream
self.__memory = memory
memory.deepest = stream
def __getitem__(self, spec):
if isinstance(spec, slice) and open_stop(spec):
return Facade(self.__stream.__getitem__(spec), self.__memory)
else:
return self.__stream.__getitem__(spec)
def __bool__(self):
return bool(self.__stream)
def __nonzero__(self):
return self.__bool__()
def __len__(self):
return len(self.__stream)
def __repr__(self):
return repr(self.__stream)
def __str__(self):
return str(self.__stream)
def __hash__(self):
return hash(self.__stream)
def __eq__(self, other):
return isinstance(other,
Facade) and self.__stream == other.__stream
@property
def location(self):
return self.__stream.location
@property
def line_number(self):
return self.__stream.line_number
@property
def line_offset(self):
return self.__stream.line_offset
@property
def character_offset(self):
return self.__stream.character_offset
@property
def text(self):
# this is a hack needed for inter-op with python regexps, which
# only accept strings. it's identical to the hack in Regexp().
try:
return self.__stream.text
except AttributeError:
return self.__stream
@property
def source(self):
return self.__stream.source
@property
def stream(self):
return self.__stream
if isinstance(stream, LocationStream):
LocationStream.register(Facade)
else:
SimpleStream.register(Facade)
memory = Memory(stream)
facade = Facade(stream, memory)
return (facade, memory)
def facade_factory(stream):
'''
Generate a facade class (we need a class so that we can register as
a subclass of the correct stream interface).
'''
class Facade(object):
__slots__ = ['_Facade__stream', '_Facade__memory', '__weakref__']
def __init__(self, stream, memory):
self.__stream = stream
self.__memory = memory
memory.deepest = stream
def __getitem__(self, spec):
if isinstance(spec, slice) and open_stop(spec):
return Facade(self.__stream.__getitem__(spec), self.__memory)
else:
return self.__stream.__getitem__(spec)
def __bool__(self):
return bool(self.__stream)
def __nonzero__(self):
return self.__bool__()
def __len__(self):
return len(self.__stream)
def __repr__(self):
return repr(self.__stream)
def __str__(self):
return str(self.__stream)
def __hash__(self):
return hash(self.__stream)
def __eq__(self, other):
return isinstance(other, Facade) and self.__stream == other.__stream
@property
def location(self):
return self.__stream.location
@property
def line_number(self):
return self.__stream.line_number
@property
def line_offset(self):
return self.__stream.line_offset
@property
def character_offset(self):
return self.__stream.character_offset
@property
def text(self):
# this is a hack needed for inter-op with python regexps, which
# only accept strings. it's identical to the hack in Regexp().
try:
return self.__stream.text
except AttributeError:
return self.__stream
@property
def source(self):
return self.__stream.source
@property
def stream(self):
return self.__stream
if isinstance(stream, LocationStream):
LocationStream.register(Facade)
else:
SimpleStream.register(Facade)
memory = Memory(stream)
facade = Facade(stream, memory)
return (facade, memory)
return BitString(value, len(value) * 8)
@staticmethod
def from_str(value, encoding=None, errors=STRICT):
'''
Create a BitString from a string.
'''
if encoding:
return BitString.from_bytearray(value.encode(encoding=encoding,
errors=errors))
else:
return BitString.from_bytearray(value.encode(errors=errors))
# pylint: disable-msg=E1101
# python 2.6 doesn't know about abcs
SimpleStream.register(BitString)
def unpack_length(length):
'''
Length is in bits, unless a decimal is specified, in which case it
it has the structure bytes.bits. Obviously this is ambiguous with float
values (eg 3.1 or 3.10), but since we only care about bits 0-7 we can
avoid any issues by requiring that range.
'''
if isinstance(length, str):
try:
length = int(length, 0)
except ValueError:
length = float(length)
if isinstance(length, int):
return length
