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py_spec.py

"""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 = None
                    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",
]

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Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2023-09-24 06:26:03
..	dir	-	root/root	0755	2023-09-24 06:26:04
__pycache__	dir	-	root/root	0755	2023-09-24 06:26:03
windows	dir	-	root/root	0755	2023-09-24 06:26:03
__init__.py	application/x-empty	0 B	root/root	0644	2023-09-05 09:10:14
builtin.py	text/x-python	5.99 KB	root/root	0644	2023-09-05 09:10:14
cached_py_info.py	text/plain	6.2 KB	root/root	0644	2023-09-05 09:10:14
discover.py	text/x-python	1.12 KB	root/root	0644	2023-09-05 09:10:14
py_info.py	text/plain	25.36 KB	root/root	0644	2023-09-05 09:10:14
py_spec.py	text/plain	4.4 KB	root/root	0644	2023-09-05 09:10:14