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Editing: py_spec.py
"""A Python specification is an abstract requirement definition of a interpreter""" from __future__ import absolute_import, unicode_literals import os import re import sys from collections import OrderedDict from virtualenv.info import fs_is_case_sensitive from virtualenv.util.six import ensure_str PATTERN = re.compile(r"^(?P<impl>[a-zA-Z]+)?(?P<version>[0-9.]+)?(?:-(?P<arch>32|64))?$") IS_WIN = sys.platform == "win32" class PythonSpec(object): """Contains specification about a Python Interpreter""" def __init__(self, str_spec, implementation, major, minor, micro, architecture, path): self.str_spec = str_spec self.implementation = implementation self.major = major self.minor = minor self.micro = micro self.architecture = architecture self.path = path @classmethod def from_string_spec(cls, string_spec): impl, major, minor, micro, arch, path = None, None, None, None, None, None if os.path.isabs(string_spec): path = string_spec else: ok = False match = re.match(PATTERN, string_spec) if match: def _int_or_none(val): return None if val is None else int(val) try: groups = match.groupdict() version = groups["version"] if version is not None: versions = tuple(int(i) for i in version.split(".") if i) if len(versions) > 3: raise ValueError if len(versions) == 3: major, minor, micro = versions elif len(versions) == 2: major, minor = versions elif len(versions) == 1: version_data = versions[0] major = int(str(version_data)[0]) # first digit major if version_data > 9: minor = int(str(version_data)[1:]) ok = True except ValueError: pass else: impl = groups["impl"] if impl == "py" or impl == "python": impl = "CPython" arch = _int_or_none(groups["arch"]) if not ok: path = string_spec return cls(string_spec, impl, major, minor, micro, arch, path) def generate_names(self): impls = OrderedDict() if self.implementation: # first consider implementation as it is impls[self.implementation] = False if fs_is_case_sensitive(): # for case sensitive file systems consider lower and upper case versions too # trivia: MacBooks and all pre 2018 Windows-es were case insensitive by default impls[self.implementation.lower()] = False impls[self.implementation.upper()] = False impls["python"] = True # finally consider python as alias, implementation must match now version = self.major, self.minor, self.micro try: version = version[: version.index(None)] except ValueError: pass for impl, match in impls.items(): for at in range(len(version), -1, -1): cur_ver = version[0:at] spec = "{}{}".format(impl, ".".join(str(i) for i in cur_ver)) yield spec, match @property def is_abs(self): return self.path is not None and os.path.isabs(self.path) def satisfies(self, spec): """called when there's a candidate metadata spec to see if compatible - e.g. PEP-514 on Windows""" if spec.is_abs and self.is_abs and self.path != spec.path: return False if spec.implementation is not None and spec.implementation.lower() != self.implementation.lower(): return False if spec.architecture is not None and spec.architecture != self.architecture: return False for our, req in zip((self.major, self.minor, self.micro), (spec.major, spec.minor, spec.micro)): if req is not None and our is not None and our != req: return False return True def __unicode__(self): return "{}({})".format( type(self).__name__, ", ".join( "{}={}".format(k, getattr(self, k)) for k in ("implementation", "major", "minor", "micro", "architecture", "path") if getattr(self, k) is not None ), ) def __repr__(self): return ensure_str(self.__unicode__())
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