91 lines
2.4 KiB
Python
91 lines
2.4 KiB
Python
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import functools
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import warnings
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import re
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import textwrap
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import email.message
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from ._text import FoldedCase
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from ._compat import pypy_partial
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# Do not remove prior to 2024-01-01 or Python 3.14
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_warn = functools.partial(
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warnings.warn,
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"Implicit None on return values is deprecated and will raise KeyErrors.",
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DeprecationWarning,
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stacklevel=pypy_partial(2),
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)
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class Message(email.message.Message):
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multiple_use_keys = set(
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map(
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FoldedCase,
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[
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'Classifier',
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'Obsoletes-Dist',
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'Platform',
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'Project-URL',
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'Provides-Dist',
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'Provides-Extra',
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'Requires-Dist',
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'Requires-External',
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'Supported-Platform',
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'Dynamic',
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],
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)
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)
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"""
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Keys that may be indicated multiple times per PEP 566.
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"""
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def __new__(cls, orig: email.message.Message):
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res = super().__new__(cls)
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vars(res).update(vars(orig))
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return res
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def __init__(self, *args, **kwargs):
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self._headers = self._repair_headers()
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# suppress spurious error from mypy
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def __iter__(self):
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return super().__iter__()
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def __getitem__(self, item):
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"""
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Warn users that a ``KeyError`` can be expected when a
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mising key is supplied. Ref python/importlib_metadata#371.
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"""
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res = super().__getitem__(item)
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if res is None:
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_warn()
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return res
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def _repair_headers(self):
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def redent(value):
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"Correct for RFC822 indentation"
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if not value or '\n' not in value:
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return value
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return textwrap.dedent(' ' * 8 + value)
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headers = [(key, redent(value)) for key, value in vars(self)['_headers']]
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if self._payload:
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headers.append(('Description', self.get_payload()))
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return headers
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@property
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def json(self):
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"""
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Convert PackageMetadata to a JSON-compatible format
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per PEP 0566.
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"""
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def transform(key):
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value = self.get_all(key) if key in self.multiple_use_keys else self[key]
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if key == 'Keywords':
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value = re.split(r'\s+', value)
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tk = key.lower().replace('-', '_')
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return tk, value
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return dict(map(transform, map(FoldedCase, self)))
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