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import logging import os import re import string import typing from itertools import chain as _chain if typing.TYPE_CHECKING: from typing_extensions import Literal _logger = logging.getLogger(__name__) # ------------------------------------------------------------------------------------- # PEP 440 VERSION_PATTERN = r""" v? (?: (?:(?P<epoch>[0-9]+)!)? # epoch (?P<release>[0-9]+(?:\.[0-9]+)*) # release segment (?P<pre> # pre-release [-_\.]? (?P<pre_l>(a|b|c|rc|alpha|beta|pre|preview)) [-_\.]? (?P<pre_n>[0-9]+)? )? (?P<post> # post release (?:-(?P<post_n1>[0-9]+)) | (?: [-_\.]? (?P<post_l>post|rev|r) [-_\.]? (?P<post_n2>[0-9]+)? ) )? (?P<dev> # dev release [-_\.]? (?P<dev_l>dev) [-_\.]? (?P<dev_n>[0-9]+)? )? ) (?:\+(?P<local>[a-z0-9]+(?:[-_\.][a-z0-9]+)*))? # local version """ VERSION_REGEX = re.compile(r"^\s*" + VERSION_PATTERN + r"\s*$", re.X | re.I) def pep440(version: str) -> bool: return VERSION_REGEX.match(version) is not None # ------------------------------------------------------------------------------------- # PEP 508 PEP508_IDENTIFIER_PATTERN = r"([A-Z0-9]|[A-Z0-9][A-Z0-9._-]*[A-Z0-9])" PEP508_IDENTIFIER_REGEX = re.compile(f"^{PEP508_IDENTIFIER_PATTERN}$", re.I) def pep508_identifier(name: str) -> bool: return PEP508_IDENTIFIER_REGEX.match(name) is not None try: try: from packaging import requirements as _req except ImportError: # pragma: no cover # let's try setuptools vendored version from setuptools._vendor.packaging import requirements as _req # type: ignore def pep508(value: str) -> bool: try: _req.Requirement(value) return True except _req.InvalidRequirement: return False except ImportError: # pragma: no cover _logger.warning( "Could not find an installation of `packaging`. Requirements, dependencies and " "versions might not be validated. " "To enforce validation, please install `packaging`." ) def pep508(value: str) -> bool: return True def pep508_versionspec(value: str) -> bool: """Expression that can be used to specify/lock versions (including ranges)""" if any(c in value for c in (";", "]", "@")): # In PEP 508: # conditional markers, extras and URL specs are not included in the # versionspec return False # Let's pretend we have a dependency called `requirement` with the given # version spec, then we can reuse the pep508 function for validation: return pep508(f"requirement{value}") # ------------------------------------------------------------------------------------- # PEP 517 def pep517_backend_reference(value: str) -> bool: module, _, obj = value.partition(":") identifiers = (i.strip() for i in _chain(module.split("."), obj.split("."))) return all(python_identifier(i) for i in identifiers if i) # ------------------------------------------------------------------------------------- # Classifiers - PEP 301 def _download_classifiers() -> str: import ssl from email.message import Message from urllib.request import urlopen url = "https://pypi.org/pypi?:action=list_classifiers" context = ssl.create_default_context() with urlopen(url, context=context) as response: headers = Message() headers["content_type"] = response.getheader("content-type", "text/plain") return response.read().decode(headers.get_param("charset", "utf-8")) class _TroveClassifier: """The ``trove_classifiers`` package is the official way of validating classifiers, however this package might not be always available. As a workaround we can still download a list from PyPI. We also don't want to be over strict about it, so simply skipping silently is an option (classifiers will be validated anyway during the upload to PyPI). """ downloaded: typing.Union[None, "Literal[False]", typing.Set[str]] def __init__(self): self.downloaded = None self._skip_download = False # None => not cached yet # False => cache not available self.__name__ = "trove_classifier" # Emulate a public function def _disable_download(self): # This is a private API. Only setuptools has the consent of using it. self._skip_download = True def __call__(self, value: str) -> bool: if self.downloaded is False or self._skip_download is True: return True if os.getenv("NO_NETWORK") or os.getenv("VALIDATE_PYPROJECT_NO_NETWORK"): self.downloaded = False msg = ( "Install ``trove-classifiers`` to ensure proper validation. " "Skipping download of classifiers list from PyPI (NO_NETWORK)." ) _logger.debug(msg) return True if self.downloaded is None: msg = ( "Install ``trove-classifiers`` to ensure proper validation. " "Meanwhile a list of classifiers will be downloaded from PyPI." ) _logger.debug(msg) try: self.downloaded = set(_download_classifiers().splitlines()) except Exception: self.downloaded = False _logger.debug("Problem with download, skipping validation") return True return value in self.downloaded or value.lower().startswith("private ::") try: from trove_classifiers import classifiers as _trove_classifiers def trove_classifier(value: str) -> bool: return value in _trove_classifiers or value.lower().startswith("private ::") except ImportError: # pragma: no cover trove_classifier = _TroveClassifier() # ------------------------------------------------------------------------------------- # Stub packages - PEP 561 def pep561_stub_name(value: str) -> bool: top, *children = value.split(".") if not top.endswith("-stubs"): return False return python_module_name(".".join([top[: -len("-stubs")], *children])) # ------------------------------------------------------------------------------------- # Non-PEP related def url(value: str) -> bool: from urllib.parse import urlparse try: parts = urlparse(value) if not parts.scheme: _logger.warning( "For maximum compatibility please make sure to include a " "`scheme` prefix in your URL (e.g. 'http://'). " f"Given value: {value}" ) if not (value.startswith("/") or value.startswith("\\") or "@" in value): parts = urlparse(f"http://{value}") return bool(parts.scheme and parts.netloc) except Exception: return False # https://packaging.python.org/specifications/entry-points/ ENTRYPOINT_PATTERN = r"[^\[\s=]([^=]*[^\s=])?" ENTRYPOINT_REGEX = re.compile(f"^{ENTRYPOINT_PATTERN}$", re.I) RECOMMEDED_ENTRYPOINT_PATTERN = r"[\w.-]+" RECOMMEDED_ENTRYPOINT_REGEX = re.compile(f"^{RECOMMEDED_ENTRYPOINT_PATTERN}$", re.I) ENTRYPOINT_GROUP_PATTERN = r"\w+(\.\w+)*" ENTRYPOINT_GROUP_REGEX = re.compile(f"^{ENTRYPOINT_GROUP_PATTERN}$", re.I) def python_identifier(value: str) -> bool: return value.isidentifier() def python_qualified_identifier(value: str) -> bool: if value.startswith(".") or value.endswith("."): return False return all(python_identifier(m) for m in value.split(".")) def python_module_name(value: str) -> bool: return python_qualified_identifier(value) def python_entrypoint_group(value: str) -> bool: return ENTRYPOINT_GROUP_REGEX.match(value) is not None def python_entrypoint_name(value: str) -> bool: if not ENTRYPOINT_REGEX.match(value): return False if not RECOMMEDED_ENTRYPOINT_REGEX.match(value): msg = f"Entry point `{value}` does not follow recommended pattern: " msg += RECOMMEDED_ENTRYPOINT_PATTERN _logger.warning(msg) return True def python_entrypoint_reference(value: str) -> bool: module, _, rest = value.partition(":") if "[" in rest: obj, _, extras_ = rest.partition("[") if extras_.strip()[-1] != "]": return False extras = (x.strip() for x in extras_.strip(string.whitespace + "[]").split(",")) if not all(pep508_identifier(e) for e in extras): return False _logger.warning(f"`{value}` - using extras for entry points is not recommended") else: obj = rest module_parts = module.split(".") identifiers = _chain(module_parts, obj.split(".")) if rest else module_parts return all(python_identifier(i.strip()) for i in identifiers)
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