def __new__(class_type, input_data=None, length=None, signed=False):
if input_data is None:
return BitArray.__new__(class_type)
if not isinstance(input_data, (int, str, class_type)):
raise TypeError(
"Input must be given as integer or binary strings or BinPyBits object. The given type was : " +
str(type(input_data)))
if isinstance(input_data, int):
if input_data < 0 or signed:
if length is None:
length = int(floor(log(abs(input_data), 2)) + 1)
input_int = input_data
signed = True
# Sign is taken care by the sign of input_data
else:
input_int = abs(input_data)
if length is None:
if input_data == 0:
length = 1
else:
length = int(floor(log(input_int, 2)) + 1)
elif isinstance(input_data, str):
# Sign is decided by the "signed" parameter or - in the input_data
# string
# Signed binary with 0b is understood by default
# to be unsigned unless other wise prepended by -
# DEV NOTE: This is so that input_data = bin(7), singed=True
# is not misinterpreted as -1
# But as a consequence -1 cannot be given as 0b111, signed = True
# It can be given as only as :
# * -0b0001 or -0001, signed = True / False
# * 1111, signed = True
if "0b" in input_data:
input_data = input_data.replace("0b", "")
if len(input_data) == 0:
input_int = 0
if length is None:
length = 0
# First priority to - in the string "-0b111" ( -7 ) or a signed
# binary number starting with 0
elif "-" in input_data or ((input_data[0] == "0") and signed):
input_int = int(input_data, 2)
# Next priority to 2s complement signed binary explicitly mentined
# as signed and whose string does not contain 0b
elif signed:
# and input_data[0] == "1" ( this check was redundant, hence removed.
# Included as comment to improve code clarity )
input_int = BitArray(bin=input_data).int
# This is equivalent to 2's complement of input_data
# Unsigned
else:
input_int = int(input_data, 2)
# Copying the value from the input_data BinPyBits object
else:
input_int = input_data.int if signed else input_data.uint
if length is None:
length = input_data.length
if length is None:
length = len(input_data)
# Initializating the super class
if signed:
return BitArray.__new__(class_type, int=input_int, length=length)
else:
return BitArray.__new__(class_type, uint=input_int, length=length)
