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from abc import ABCMeta
from collections import OrderedDict
from pathlib import Path
from virtualenv.info import IS_WIN
class Describe(metaclass=ABCMeta):
"""Given a host interpreter tell us information about what the created interpreter might look like"""
suffix = ".exe" if IS_WIN else ""
def __init__(self, dest, interpreter):
self.interpreter = interpreter
self.dest = dest
self._stdlib = None
self._stdlib_platform = None
self._system_stdlib = None
self._conf_vars = None
@property
def bin_dir(self):
return self.script_dir
@property
def script_dir(self):
return self.dest / self.interpreter.install_path("scripts")
@property
def purelib(self):
return self.dest / self.interpreter.install_path("purelib")
@property
def platlib(self):
return self.dest / self.interpreter.install_path("platlib")
@property
def libs(self):
return list(OrderedDict(((self.platlib, None), (self.purelib, None))).keys())
@property
def stdlib(self):
if self._stdlib is None:
self._stdlib = Path(self.interpreter.sysconfig_path("stdlib", config_var=self._config_vars))
return self._stdlib
@property
def stdlib_platform(self):
if self._stdlib_platform is None:
self._stdlib_platform = Path(self.interpreter.sysconfig_path("platstdlib", config_var=self._config_vars))
return self._stdlib_platform
@property
def _config_vars(self):
if self._conf_vars is None:
self._conf_vars = self._calc_config_vars(self.dest)
return self._conf_vars
def _calc_config_vars(self, to):
sys_vars = self.interpreter.sysconfig_vars
return {k: (to if v.startswith(self.interpreter.prefix) else v) for k, v in sys_vars.items()}
@classmethod
def can_describe(cls, interpreter): # noqa: U100
"""Knows means it knows how the output will look"""
return True
@property
def env_name(self):
return self.dest.parts[-1]
@property
def exe(self):
return self.bin_dir / f"{self.exe_stem()}{self.suffix}"
@classmethod
def exe_stem(cls):
"""executable name without suffix - there seems to be no standard way to get this without creating it"""
raise NotImplementedError
def script(self, name):
return self.script_dir / f"{name}{self.suffix}"
class Python2Supports(Describe, metaclass=ABCMeta):
@classmethod
def can_describe(cls, interpreter):
return interpreter.version_info.major == 2 and super().can_describe(interpreter)
class Python3Supports(Describe, metaclass=ABCMeta):
@classmethod
def can_describe(cls, interpreter):
return interpreter.version_info.major == 3 and super().can_describe(interpreter)
class PosixSupports(Describe, metaclass=ABCMeta):
@classmethod
def can_describe(cls, interpreter):
return interpreter.os == "posix" and super().can_describe(interpreter)
class WindowsSupports(Describe, metaclass=ABCMeta):
@classmethod
def can_describe(cls, interpreter):
return interpreter.os == "nt" and super().can_describe(interpreter)
__all__ = [
"Describe",
"Python2Supports",
"Python3Supports",
"PosixSupports",
"WindowsSupports",
]
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