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import functools
import logging
from email.message import Message
from email.parser import FeedParser
from typing import Optional, Tuple
from pip._vendor import pkg_resources
from pip._vendor.packaging import specifiers, version
from pip._vendor.packaging.requirements import Requirement
from pip._vendor.pkg_resources import Distribution
from pip._internal.exceptions import NoneMetadataError
from pip._internal.utils.misc import display_path
logger = logging.getLogger(__name__)
def check_requires_python(
requires_python: Optional[str], version_info: Tuple[int, ...]
) -> bool:
"""
Check if the given Python version matches a "Requires-Python" specifier.
:param version_info: A 3-tuple of ints representing a Python
major-minor-micro version to check (e.g. `sys.version_info[:3]`).
:return: `True` if the given Python version satisfies the requirement.
Otherwise, return `False`.
:raises InvalidSpecifier: If `requires_python` has an invalid format.
"""
if requires_python is None:
# The package provides no information
return True
requires_python_specifier = specifiers.SpecifierSet(requires_python)
python_version = version.parse(".".join(map(str, version_info)))
return python_version in requires_python_specifier
def get_metadata(dist: Distribution) -> Message:
"""
:raises NoneMetadataError: if the distribution reports `has_metadata()`
True but `get_metadata()` returns None.
"""
metadata_name = "METADATA"
if isinstance(dist, pkg_resources.DistInfoDistribution) and dist.has_metadata(
metadata_name
):
metadata = dist.get_metadata(metadata_name)
elif dist.has_metadata("PKG-INFO"):
metadata_name = "PKG-INFO"
metadata = dist.get_metadata(metadata_name)
else:
logger.warning("No metadata found in %s", display_path(dist.location))
metadata = ""
if metadata is None:
raise NoneMetadataError(dist, metadata_name)
feed_parser = FeedParser()
# The following line errors out if with a "NoneType" TypeError if
# passed metadata=None.
feed_parser.feed(metadata)
return feed_parser.close()
def get_installer(dist: Distribution) -> str:
if dist.has_metadata("INSTALLER"):
for line in dist.get_metadata_lines("INSTALLER"):
if line.strip():
return line.strip()
return ""
@functools.lru_cache(maxsize=512)
def get_requirement(req_string: str) -> Requirement:
"""Construct a packaging.Requirement object with caching"""
# Parsing requirement strings is expensive, and is also expected to happen
# with a low diversity of different arguments (at least relative the number
# constructed). This method adds a cache to requirement object creation to
# minimize repeated parsing of the same string to construct equivalent
# Requirement objects.
return Requirement(req_string)