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from ..exceptions import DataError
class Encoder:
"Encode strings to bytes-like and decode bytes-like to strings"
__slots__ = "encoding", "encoding_errors", "decode_responses"
def __init__(self, encoding, encoding_errors, decode_responses):
self.encoding = encoding
self.encoding_errors = encoding_errors
self.decode_responses = decode_responses
def encode(self, value):
"Return a bytestring or bytes-like representation of the value"
if isinstance(value, (bytes, memoryview)):
return value
elif isinstance(value, bool):
# special case bool since it is a subclass of int
raise DataError(
"Invalid input of type: 'bool'. Convert to a "
"bytes, string, int or float first."
)
elif isinstance(value, (int, float)):
value = repr(value).encode()
elif not isinstance(value, str):
# a value we don't know how to deal with. throw an error
typename = type(value).__name__
raise DataError(
f"Invalid input of type: '{typename}'. "
f"Convert to a bytes, string, int or float first."
)
if isinstance(value, str):
value = value.encode(self.encoding, self.encoding_errors)
return value
def decode(self, value, force=False):
"Return a unicode string from the bytes-like representation"
if self.decode_responses or force:
if isinstance(value, memoryview):
value = value.tobytes()
if isinstance(value, bytes):
value = value.decode(self.encoding, self.encoding_errors)
return value
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