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