117 lines
3.8 KiB
Python
117 lines
3.8 KiB
Python
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from operator import attrgetter
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from zipfile import ZipFile
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class Wheel:
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def __init__(self, path):
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# https://www.python.org/dev/peps/pep-0427/#file-name-convention
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# The wheel filename is {distribution}-{version}(-{build tag})?-{python tag}-{abi tag}-{platform tag}.whl
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self.path = path
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self._parts = path.stem.split("-")
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@classmethod
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def from_path(cls, path):
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if path is not None and path.suffix == ".whl" and len(path.stem.split("-")) >= 5:
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return cls(path)
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return None
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@property
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def distribution(self):
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return self._parts[0]
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@property
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def version(self):
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return self._parts[1]
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@property
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def version_tuple(self):
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return self.as_version_tuple(self.version)
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@staticmethod
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def as_version_tuple(version):
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result = []
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for part in version.split(".")[0:3]:
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try:
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result.append(int(part))
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except ValueError:
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break
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if not result:
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raise ValueError(version)
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return tuple(result)
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@property
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def name(self):
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return self.path.name
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def support_py(self, py_version):
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name = f"{'-'.join(self.path.stem.split('-')[0:2])}.dist-info/METADATA"
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with ZipFile(str(self.path), "r") as zip_file:
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metadata = zip_file.read(name).decode("utf-8")
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marker = "Requires-Python:"
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requires = next((i[len(marker) :] for i in metadata.splitlines() if i.startswith(marker)), None)
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if requires is None: # if it does not specify a python requires the assumption is compatible
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return True
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py_version_int = tuple(int(i) for i in py_version.split("."))
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for require in (i.strip() for i in requires.split(",")):
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# https://www.python.org/dev/peps/pep-0345/#version-specifiers
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for operator, check in [
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("!=", lambda v: py_version_int != v),
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("==", lambda v: py_version_int == v),
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("<=", lambda v: py_version_int <= v),
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(">=", lambda v: py_version_int >= v),
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("<", lambda v: py_version_int < v),
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(">", lambda v: py_version_int > v),
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]:
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if require.startswith(operator):
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ver_str = require[len(operator) :].strip()
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version = tuple((int(i) if i != "*" else None) for i in ver_str.split("."))[0:2]
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if not check(version):
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return False
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break
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return True
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def __repr__(self):
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return f"{self.__class__.__name__}({self.path})"
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def __str__(self):
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return str(self.path)
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def discover_wheels(from_folder, distribution, version, for_py_version):
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wheels = []
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for filename in from_folder.iterdir():
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wheel = Wheel.from_path(filename)
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if wheel and wheel.distribution == distribution:
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if version is None or wheel.version == version:
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if wheel.support_py(for_py_version):
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wheels.append(wheel)
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return sorted(wheels, key=attrgetter("version_tuple", "distribution"), reverse=True)
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class Version:
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#: the version bundled with virtualenv
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bundle = "bundle"
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embed = "embed"
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#: custom version handlers
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non_version = (bundle, embed)
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@staticmethod
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def of_version(value):
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return None if value in Version.non_version else value
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@staticmethod
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def as_pip_req(distribution, version):
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return f"{distribution}{Version.as_version_spec(version)}"
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@staticmethod
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def as_version_spec(version):
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of_version = Version.of_version(version)
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return "" if of_version is None else f"=={of_version}"
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__all__ = [
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"discover_wheels",
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"Version",
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"Wheel",
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]
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