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