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bpo-38659: [Enum] add _simple_enum decorator (GH-25497)

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add:

* `_simple_enum` decorator to transform a normal class into an enum
* `_test_simple_enum` function to compare
* `_old_convert_` to enable checking `_convert_` generated enums

`_simple_enum` takes a normal class and converts it into an enum:

    @simple_enum(Enum)
    class Color:
        RED = 1
        GREEN = 2
        BLUE = 3

`_old_convert_` works much like` _convert_` does, using the original logic:

    # in a test file
    import socket, enum
    CheckedAddressFamily = enum._old_convert_(
            enum.IntEnum, 'AddressFamily', 'socket',
            lambda C: C.isupper() and C.startswith('AF_'),
            source=_socket,
            )

`_test_simple_enum` takes a traditional enum and a simple enum and
compares the two:

    # in the REPL or the same module as Color
    class CheckedColor(Enum):
        RED = 1
        GREEN = 2
        BLUE = 3

    _test_simple_enum(CheckedColor, Color)

    _test_simple_enum(CheckedAddressFamily, socket.AddressFamily)

Any important differences will raise a TypeError
This commit is contained in:
Ethan Furman 2021-04-21 10:20:44 -07:00 • committed by GitHub
parent 56c95dfe27
commit a02cb474f9
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20 changed files with 870 additions and 34 deletions
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13
Lib/ssl.py
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@ -94,6 +94,7 @@ import sys
import os
from collections import namedtuple
from enum import Enum as _Enum, IntEnum as _IntEnum, IntFlag as _IntFlag
from enum import _simple_enum, _test_simple_enum
import _ssl # if we can't import it, let the error propagate
@ -155,7 +156,8 @@ _PROTOCOL_NAMES = {value: name for name, value in _SSLMethod.__members__.items()
_SSLv2_IF_EXISTS = getattr(_SSLMethod, 'PROTOCOL_SSLv2', None)
class TLSVersion(_IntEnum):
@_simple_enum(_IntEnum)
class TLSVersion:
MINIMUM_SUPPORTED = _ssl.PROTO_MINIMUM_SUPPORTED
SSLv3 = _ssl.PROTO_SSLv3
TLSv1 = _ssl.PROTO_TLSv1
@ -165,7 +167,8 @@ class TLSVersion(_IntEnum):
MAXIMUM_SUPPORTED = _ssl.PROTO_MAXIMUM_SUPPORTED
class _TLSContentType(_IntEnum):
@_simple_enum(_IntEnum)
class _TLSContentType:
"""Content types (record layer)
See RFC 8446, section B.1
@ -179,7 +182,8 @@ class _TLSContentType(_IntEnum):
INNER_CONTENT_TYPE = 0x101
class _TLSAlertType(_IntEnum):
@_simple_enum(_IntEnum)
class _TLSAlertType:
"""Alert types for TLSContentType.ALERT messages
See RFC 8466, section B.2
@ -220,7 +224,8 @@ class _TLSAlertType(_IntEnum):
NO_APPLICATION_PROTOCOL = 120
class _TLSMessageType(_IntEnum):
@_simple_enum(_IntEnum)
class _TLSMessageType:
"""Message types (handshake protocol)
See RFC 8446, section B.3