annotate planemo/lib/python3.7/site-packages/pip/_internal/utils/packaging.py @ 1:56ad4e20f292 draft

"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400 (2020-07-31)
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1 from __future__ import absolute_import
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2
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3 import logging
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4 from email.parser import FeedParser
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5
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6 from pip._vendor import pkg_resources
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7 from pip._vendor.packaging import specifiers, version
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8
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9 from pip._internal.exceptions import NoneMetadataError
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10 from pip._internal.utils.misc import display_path
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11 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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12
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13 if MYPY_CHECK_RUNNING:
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14 from typing import Optional, Tuple
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15 from email.message import Message
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16 from pip._vendor.pkg_resources import Distribution
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17
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18
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19 logger = logging.getLogger(__name__)
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20
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21
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22 def check_requires_python(requires_python, version_info):
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23 # type: (Optional[str], Tuple[int, ...]) -> bool
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24 """
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25 Check if the given Python version matches a "Requires-Python" specifier.
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26
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27 :param version_info: A 3-tuple of ints representing a Python
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28 major-minor-micro version to check (e.g. `sys.version_info[:3]`).
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29
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30 :return: `True` if the given Python version satisfies the requirement.
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31 Otherwise, return `False`.
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32
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33 :raises InvalidSpecifier: If `requires_python` has an invalid format.
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34 """
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35 if requires_python is None:
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36 # The package provides no information
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37 return True
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38 requires_python_specifier = specifiers.SpecifierSet(requires_python)
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39
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40 python_version = version.parse('.'.join(map(str, version_info)))
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41 return python_version in requires_python_specifier
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42
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43
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44 def get_metadata(dist):
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45 # type: (Distribution) -> Message
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46 """
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47 :raises NoneMetadataError: if the distribution reports `has_metadata()`
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48 True but `get_metadata()` returns None.
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49 """
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50 metadata_name = 'METADATA'
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51 if (isinstance(dist, pkg_resources.DistInfoDistribution) and
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52 dist.has_metadata(metadata_name)):
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53 metadata = dist.get_metadata(metadata_name)
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54 elif dist.has_metadata('PKG-INFO'):
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55 metadata_name = 'PKG-INFO'
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56 metadata = dist.get_metadata(metadata_name)
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57 else:
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58 logger.warning("No metadata found in %s", display_path(dist.location))
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59 metadata = ''
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60
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61 if metadata is None:
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62 raise NoneMetadataError(dist, metadata_name)
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63
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64 feed_parser = FeedParser()
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65 # The following line errors out if with a "NoneType" TypeError if
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66 # passed metadata=None.
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67 feed_parser.feed(metadata)
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68 return feed_parser.close()
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69
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70
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71 def get_requires_python(dist):
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72 # type: (pkg_resources.Distribution) -> Optional[str]
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73 """
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74 Return the "Requires-Python" metadata for a distribution, or None
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75 if not present.
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76 """
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77 pkg_info_dict = get_metadata(dist)
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78 requires_python = pkg_info_dict.get('Requires-Python')
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79
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80 if requires_python is not None:
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81 # Convert to a str to satisfy the type checker, since requires_python
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82 # can be a Header object.
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83 requires_python = str(requires_python)
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84
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85 return requires_python
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86
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87
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88 def get_installer(dist):
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89 # type: (Distribution) -> str
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90 if dist.has_metadata('INSTALLER'):
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91 for line in dist.get_metadata_lines('INSTALLER'):
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92 if line.strip():
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93 return line.strip()
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94 return ''