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