116 lines
4.4 KiB
Python
116 lines
4.4 KiB
Python
|
"""A Python specification is an abstract requirement definition of an interpreter"""
|
||
|
|
|
||
|
|
import os
|
||
|
|
import re
|
||
|
|
from collections import OrderedDict
|
||
|
|
|
||
|
|
from virtualenv.info import fs_is_case_sensitive
|
||
|
|
|
||
|
|
PATTERN = re.compile(r"^(?P<impl>[a-zA-Z]+)?(?P<version>[0-9.]+)?(?:-(?P<arch>32|64))?$")
|
||
|
|
|
||
|
|
|
||
|
|
class PythonSpec:
|
||
|
|
"""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 = f"{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 __repr__(self):
|
||
|
|
name = type(self).__name__
|
||
|
|
params = "implementation", "major", "minor", "micro", "architecture", "path"
|
||
|
|
return f"{name}({', '.join(f'{k}={getattr(self, k)}' for k in params if getattr(self, k) is not None)})"
|
||
|
|
|
||
|
|
|
||
|
|
__all__ = [
|
||
|
|
"PythonSpec",
|
||
|
|
]
|