mirror of https://github.com/morpheus65535/bazarr
905 lines
26 KiB
Python
905 lines
26 KiB
Python
import os
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import re
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import abc
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import csv
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import sys
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import zipp
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import email
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import pathlib
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import operator
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import textwrap
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import warnings
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import functools
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import itertools
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import posixpath
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import collections
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from . import _adapters, _meta, _py39compat
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from ._collections import FreezableDefaultDict, Pair
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from ._compat import (
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NullFinder,
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install,
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pypy_partial,
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)
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from ._functools import method_cache, pass_none
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from ._itertools import always_iterable, unique_everseen
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from ._meta import PackageMetadata, SimplePath
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from contextlib import suppress
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from importlib import import_module
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from importlib.abc import MetaPathFinder
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from itertools import starmap
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from typing import List, Mapping, Optional
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__all__ = [
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'Distribution',
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'DistributionFinder',
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'PackageMetadata',
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'PackageNotFoundError',
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'distribution',
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'distributions',
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'entry_points',
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'files',
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'metadata',
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'packages_distributions',
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'requires',
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'version',
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]
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class PackageNotFoundError(ModuleNotFoundError):
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"""The package was not found."""
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def __str__(self):
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return f"No package metadata was found for {self.name}"
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@property
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def name(self):
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(name,) = self.args
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return name
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class Sectioned:
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"""
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A simple entry point config parser for performance
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>>> for item in Sectioned.read(Sectioned._sample):
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... print(item)
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Pair(name='sec1', value='# comments ignored')
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Pair(name='sec1', value='a = 1')
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Pair(name='sec1', value='b = 2')
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Pair(name='sec2', value='a = 2')
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>>> res = Sectioned.section_pairs(Sectioned._sample)
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>>> item = next(res)
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>>> item.name
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'sec1'
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>>> item.value
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Pair(name='a', value='1')
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>>> item = next(res)
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>>> item.value
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Pair(name='b', value='2')
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>>> item = next(res)
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>>> item.name
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'sec2'
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>>> item.value
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Pair(name='a', value='2')
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>>> list(res)
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[]
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"""
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_sample = textwrap.dedent(
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"""
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[sec1]
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# comments ignored
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a = 1
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b = 2
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[sec2]
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a = 2
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"""
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).lstrip()
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@classmethod
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def section_pairs(cls, text):
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return (
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section._replace(value=Pair.parse(section.value))
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for section in cls.read(text, filter_=cls.valid)
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if section.name is not None
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)
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@staticmethod
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def read(text, filter_=None):
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lines = filter(filter_, map(str.strip, text.splitlines()))
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name = None
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for value in lines:
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section_match = value.startswith('[') and value.endswith(']')
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if section_match:
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name = value.strip('[]')
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continue
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yield Pair(name, value)
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@staticmethod
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def valid(line):
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return line and not line.startswith('#')
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class DeprecatedTuple:
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"""
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Provide subscript item access for backward compatibility.
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>>> recwarn = getfixture('recwarn')
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>>> ep = EntryPoint(name='name', value='value', group='group')
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>>> ep[:]
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('name', 'value', 'group')
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>>> ep[0]
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'name'
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>>> len(recwarn)
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1
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"""
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_warn = functools.partial(
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warnings.warn,
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"EntryPoint tuple interface is deprecated. Access members by name.",
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DeprecationWarning,
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stacklevel=pypy_partial(2),
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)
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def __getitem__(self, item):
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self._warn()
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return self._key()[item]
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class EntryPoint(DeprecatedTuple):
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"""An entry point as defined by Python packaging conventions.
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See `the packaging docs on entry points
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<https://packaging.python.org/specifications/entry-points/>`_
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for more information.
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>>> ep = EntryPoint(
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... name=None, group=None, value='package.module:attr [extra1, extra2]')
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>>> ep.module
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'package.module'
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>>> ep.attr
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'attr'
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>>> ep.extras
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['extra1', 'extra2']
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"""
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pattern = re.compile(
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r'(?P<module>[\w.]+)\s*'
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r'(:\s*(?P<attr>[\w.]+)\s*)?'
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r'((?P<extras>\[.*\])\s*)?$'
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)
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"""
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A regular expression describing the syntax for an entry point,
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which might look like:
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- module
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- package.module
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- package.module:attribute
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- package.module:object.attribute
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- package.module:attr [extra1, extra2]
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Other combinations are possible as well.
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The expression is lenient about whitespace around the ':',
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following the attr, and following any extras.
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"""
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name: str
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value: str
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group: str
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dist: Optional['Distribution'] = None
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def __init__(self, name, value, group):
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vars(self).update(name=name, value=value, group=group)
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def load(self):
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"""Load the entry point from its definition. If only a module
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is indicated by the value, return that module. Otherwise,
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return the named object.
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"""
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match = self.pattern.match(self.value)
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module = import_module(match.group('module'))
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attrs = filter(None, (match.group('attr') or '').split('.'))
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return functools.reduce(getattr, attrs, module)
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@property
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def module(self):
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match = self.pattern.match(self.value)
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return match.group('module')
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@property
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def attr(self):
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match = self.pattern.match(self.value)
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return match.group('attr')
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@property
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def extras(self):
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match = self.pattern.match(self.value)
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return re.findall(r'\w+', match.group('extras') or '')
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def _for(self, dist):
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vars(self).update(dist=dist)
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return self
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def matches(self, **params):
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"""
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EntryPoint matches the given parameters.
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>>> ep = EntryPoint(group='foo', name='bar', value='bing:bong [extra1, extra2]')
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>>> ep.matches(group='foo')
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True
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>>> ep.matches(name='bar', value='bing:bong [extra1, extra2]')
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True
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>>> ep.matches(group='foo', name='other')
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False
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>>> ep.matches()
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True
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>>> ep.matches(extras=['extra1', 'extra2'])
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True
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>>> ep.matches(module='bing')
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True
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>>> ep.matches(attr='bong')
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True
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"""
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attrs = (getattr(self, param) for param in params)
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return all(map(operator.eq, params.values(), attrs))
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def _key(self):
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return self.name, self.value, self.group
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def __lt__(self, other):
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return self._key() < other._key()
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def __eq__(self, other):
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return self._key() == other._key()
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def __setattr__(self, name, value):
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raise AttributeError("EntryPoint objects are immutable.")
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def __repr__(self):
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return (
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f'EntryPoint(name={self.name!r}, value={self.value!r}, '
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f'group={self.group!r})'
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)
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def __hash__(self):
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return hash(self._key())
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class EntryPoints(tuple):
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"""
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An immutable collection of selectable EntryPoint objects.
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"""
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__slots__ = ()
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def __getitem__(self, name): # -> EntryPoint:
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"""
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Get the EntryPoint in self matching name.
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"""
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try:
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return next(iter(self.select(name=name)))
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except StopIteration:
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raise KeyError(name)
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def select(self, **params):
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"""
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Select entry points from self that match the
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given parameters (typically group and/or name).
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"""
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candidates = (_py39compat.ep_matches(ep, **params) for ep in self)
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return EntryPoints(ep for ep, predicate in candidates if predicate)
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@property
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def names(self):
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"""
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Return the set of all names of all entry points.
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"""
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return {ep.name for ep in self}
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@property
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def groups(self):
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"""
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Return the set of all groups of all entry points.
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"""
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return {ep.group for ep in self}
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@classmethod
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def _from_text_for(cls, text, dist):
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return cls(ep._for(dist) for ep in cls._from_text(text))
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@staticmethod
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def _from_text(text):
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return (
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EntryPoint(name=item.value.name, value=item.value.value, group=item.name)
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for item in Sectioned.section_pairs(text or '')
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)
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class PackagePath(pathlib.PurePosixPath):
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"""A reference to a path in a package"""
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def read_text(self, encoding='utf-8'):
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with self.locate().open(encoding=encoding) as stream:
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return stream.read()
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def read_binary(self):
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with self.locate().open('rb') as stream:
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return stream.read()
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def locate(self):
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"""Return a path-like object for this path"""
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return self.dist.locate_file(self)
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class FileHash:
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def __init__(self, spec):
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self.mode, _, self.value = spec.partition('=')
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def __repr__(self):
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return f'<FileHash mode: {self.mode} value: {self.value}>'
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class Distribution:
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"""A Python distribution package."""
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@abc.abstractmethod
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def read_text(self, filename):
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"""Attempt to load metadata file given by the name.
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:param filename: The name of the file in the distribution info.
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:return: The text if found, otherwise None.
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"""
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@abc.abstractmethod
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def locate_file(self, path):
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"""
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Given a path to a file in this distribution, return a path
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to it.
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"""
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@classmethod
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def from_name(cls, name: str):
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"""Return the Distribution for the given package name.
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:param name: The name of the distribution package to search for.
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:return: The Distribution instance (or subclass thereof) for the named
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package, if found.
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:raises PackageNotFoundError: When the named package's distribution
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metadata cannot be found.
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:raises ValueError: When an invalid value is supplied for name.
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"""
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if not name:
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raise ValueError("A distribution name is required.")
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try:
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return next(cls.discover(name=name))
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except StopIteration:
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raise PackageNotFoundError(name)
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@classmethod
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def discover(cls, **kwargs):
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"""Return an iterable of Distribution objects for all packages.
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Pass a ``context`` or pass keyword arguments for constructing
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a context.
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:context: A ``DistributionFinder.Context`` object.
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:return: Iterable of Distribution objects for all packages.
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"""
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context = kwargs.pop('context', None)
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if context and kwargs:
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raise ValueError("cannot accept context and kwargs")
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context = context or DistributionFinder.Context(**kwargs)
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return itertools.chain.from_iterable(
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resolver(context) for resolver in cls._discover_resolvers()
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)
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@staticmethod
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def at(path):
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"""Return a Distribution for the indicated metadata path
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:param path: a string or path-like object
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:return: a concrete Distribution instance for the path
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"""
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return PathDistribution(pathlib.Path(path))
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@staticmethod
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def _discover_resolvers():
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"""Search the meta_path for resolvers."""
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declared = (
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getattr(finder, 'find_distributions', None) for finder in sys.meta_path
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)
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return filter(None, declared)
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@property
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def metadata(self) -> _meta.PackageMetadata:
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"""Return the parsed metadata for this Distribution.
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The returned object will have keys that name the various bits of
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metadata. See PEP 566 for details.
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"""
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text = (
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self.read_text('METADATA')
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or self.read_text('PKG-INFO')
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# This last clause is here to support old egg-info files. Its
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# effect is to just end up using the PathDistribution's self._path
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# (which points to the egg-info file) attribute unchanged.
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or self.read_text('')
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)
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return _adapters.Message(email.message_from_string(text))
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@property
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def name(self):
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"""Return the 'Name' metadata for the distribution package."""
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return self.metadata['Name']
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@property
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def _normalized_name(self):
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"""Return a normalized version of the name."""
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return Prepared.normalize(self.name)
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@property
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def version(self):
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"""Return the 'Version' metadata for the distribution package."""
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return self.metadata['Version']
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@property
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def entry_points(self):
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return EntryPoints._from_text_for(self.read_text('entry_points.txt'), self)
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|
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@property
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def files(self):
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"""Files in this distribution.
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:return: List of PackagePath for this distribution or None
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Result is `None` if the metadata file that enumerates files
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(i.e. RECORD for dist-info or SOURCES.txt for egg-info) is
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missing.
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Result may be empty if the metadata exists but is empty.
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"""
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def make_file(name, hash=None, size_str=None):
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result = PackagePath(name)
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result.hash = FileHash(hash) if hash else None
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result.size = int(size_str) if size_str else None
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result.dist = self
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return result
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@pass_none
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def make_files(lines):
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return list(starmap(make_file, csv.reader(lines)))
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|
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return make_files(self._read_files_distinfo() or self._read_files_egginfo())
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|
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def _read_files_distinfo(self):
|
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"""
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Read the lines of RECORD
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"""
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text = self.read_text('RECORD')
|
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return text and text.splitlines()
|
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|
|
def _read_files_egginfo(self):
|
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"""
|
|
SOURCES.txt might contain literal commas, so wrap each line
|
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in quotes.
|
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"""
|
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text = self.read_text('SOURCES.txt')
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return text and map('"{}"'.format, text.splitlines())
|
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|
|
@property
|
|
def requires(self):
|
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"""Generated requirements specified for this Distribution"""
|
|
reqs = self._read_dist_info_reqs() or self._read_egg_info_reqs()
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return reqs and list(reqs)
|
|
|
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def _read_dist_info_reqs(self):
|
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return self.metadata.get_all('Requires-Dist')
|
|
|
|
def _read_egg_info_reqs(self):
|
|
source = self.read_text('requires.txt')
|
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return pass_none(self._deps_from_requires_text)(source)
|
|
|
|
@classmethod
|
|
def _deps_from_requires_text(cls, source):
|
|
return cls._convert_egg_info_reqs_to_simple_reqs(Sectioned.read(source))
|
|
|
|
@staticmethod
|
|
def _convert_egg_info_reqs_to_simple_reqs(sections):
|
|
"""
|
|
Historically, setuptools would solicit and store 'extra'
|
|
requirements, including those with environment markers,
|
|
in separate sections. More modern tools expect each
|
|
dependency to be defined separately, with any relevant
|
|
extras and environment markers attached directly to that
|
|
requirement. This method converts the former to the
|
|
latter. See _test_deps_from_requires_text for an example.
|
|
"""
|
|
|
|
def make_condition(name):
|
|
return name and f'extra == "{name}"'
|
|
|
|
def quoted_marker(section):
|
|
section = section or ''
|
|
extra, sep, markers = section.partition(':')
|
|
if extra and markers:
|
|
markers = f'({markers})'
|
|
conditions = list(filter(None, [markers, make_condition(extra)]))
|
|
return '; ' + ' and '.join(conditions) if conditions else ''
|
|
|
|
def url_req_space(req):
|
|
"""
|
|
PEP 508 requires a space between the url_spec and the quoted_marker.
|
|
Ref python/importlib_metadata#357.
|
|
"""
|
|
# '@' is uniquely indicative of a url_req.
|
|
return ' ' * ('@' in req)
|
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|
|
for section in sections:
|
|
space = url_req_space(section.value)
|
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yield section.value + space + quoted_marker(section.name)
|
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|
|
|
|
class DistributionFinder(MetaPathFinder):
|
|
"""
|
|
A MetaPathFinder capable of discovering installed distributions.
|
|
"""
|
|
|
|
class Context:
|
|
"""
|
|
Keyword arguments presented by the caller to
|
|
``distributions()`` or ``Distribution.discover()``
|
|
to narrow the scope of a search for distributions
|
|
in all DistributionFinders.
|
|
|
|
Each DistributionFinder may expect any parameters
|
|
and should attempt to honor the canonical
|
|
parameters defined below when appropriate.
|
|
"""
|
|
|
|
name = None
|
|
"""
|
|
Specific name for which a distribution finder should match.
|
|
A name of ``None`` matches all distributions.
|
|
"""
|
|
|
|
def __init__(self, **kwargs):
|
|
vars(self).update(kwargs)
|
|
|
|
@property
|
|
def path(self):
|
|
"""
|
|
The sequence of directory path that a distribution finder
|
|
should search.
|
|
|
|
Typically refers to Python installed package paths such as
|
|
"site-packages" directories and defaults to ``sys.path``.
|
|
"""
|
|
return vars(self).get('path', sys.path)
|
|
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@abc.abstractmethod
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def find_distributions(self, context=Context()):
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"""
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Find distributions.
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Return an iterable of all Distribution instances capable of
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loading the metadata for packages matching the ``context``,
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a DistributionFinder.Context instance.
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"""
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class FastPath:
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"""
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Micro-optimized class for searching a path for
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children.
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>>> FastPath('').children()
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['...']
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"""
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@functools.lru_cache() # type: ignore
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def __new__(cls, root):
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return super().__new__(cls)
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def __init__(self, root):
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self.root = root
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def joinpath(self, child):
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return pathlib.Path(self.root, child)
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def children(self):
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with suppress(Exception):
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return os.listdir(self.root or '.')
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with suppress(Exception):
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return self.zip_children()
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return []
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def zip_children(self):
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zip_path = zipp.Path(self.root)
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names = zip_path.root.namelist()
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self.joinpath = zip_path.joinpath
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return dict.fromkeys(child.split(posixpath.sep, 1)[0] for child in names)
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def search(self, name):
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return self.lookup(self.mtime).search(name)
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@property
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def mtime(self):
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with suppress(OSError):
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return os.stat(self.root).st_mtime
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self.lookup.cache_clear()
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@method_cache
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def lookup(self, mtime):
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return Lookup(self)
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class Lookup:
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def __init__(self, path: FastPath):
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base = os.path.basename(path.root).lower()
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base_is_egg = base.endswith(".egg")
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self.infos = FreezableDefaultDict(list)
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self.eggs = FreezableDefaultDict(list)
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for child in path.children():
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low = child.lower()
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if low.endswith((".dist-info", ".egg-info")):
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# rpartition is faster than splitext and suitable for this purpose.
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name = low.rpartition(".")[0].partition("-")[0]
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normalized = Prepared.normalize(name)
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self.infos[normalized].append(path.joinpath(child))
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elif base_is_egg and low == "egg-info":
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name = base.rpartition(".")[0].partition("-")[0]
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legacy_normalized = Prepared.legacy_normalize(name)
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self.eggs[legacy_normalized].append(path.joinpath(child))
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self.infos.freeze()
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self.eggs.freeze()
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def search(self, prepared):
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infos = (
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self.infos[prepared.normalized]
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if prepared
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else itertools.chain.from_iterable(self.infos.values())
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)
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eggs = (
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self.eggs[prepared.legacy_normalized]
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if prepared
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else itertools.chain.from_iterable(self.eggs.values())
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)
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return itertools.chain(infos, eggs)
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class Prepared:
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"""
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A prepared search for metadata on a possibly-named package.
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"""
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normalized = None
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legacy_normalized = None
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def __init__(self, name):
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self.name = name
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if name is None:
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return
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self.normalized = self.normalize(name)
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self.legacy_normalized = self.legacy_normalize(name)
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@staticmethod
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def normalize(name):
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"""
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PEP 503 normalization plus dashes as underscores.
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"""
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return re.sub(r"[-_.]+", "-", name).lower().replace('-', '_')
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@staticmethod
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def legacy_normalize(name):
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"""
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Normalize the package name as found in the convention in
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older packaging tools versions and specs.
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"""
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return name.lower().replace('-', '_')
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def __bool__(self):
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return bool(self.name)
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@install
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class MetadataPathFinder(NullFinder, DistributionFinder):
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"""A degenerate finder for distribution packages on the file system.
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This finder supplies only a find_distributions() method for versions
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of Python that do not have a PathFinder find_distributions().
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"""
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def find_distributions(self, context=DistributionFinder.Context()):
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"""
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Find distributions.
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Return an iterable of all Distribution instances capable of
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loading the metadata for packages matching ``context.name``
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(or all names if ``None`` indicated) along the paths in the list
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of directories ``context.path``.
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"""
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found = self._search_paths(context.name, context.path)
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return map(PathDistribution, found)
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@classmethod
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def _search_paths(cls, name, paths):
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"""Find metadata directories in paths heuristically."""
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prepared = Prepared(name)
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return itertools.chain.from_iterable(
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path.search(prepared) for path in map(FastPath, paths)
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)
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def invalidate_caches(cls):
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FastPath.__new__.cache_clear()
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class PathDistribution(Distribution):
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def __init__(self, path: SimplePath):
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"""Construct a distribution.
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:param path: SimplePath indicating the metadata directory.
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"""
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self._path = path
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def read_text(self, filename):
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with suppress(
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FileNotFoundError,
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IsADirectoryError,
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KeyError,
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NotADirectoryError,
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PermissionError,
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):
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return self._path.joinpath(filename).read_text(encoding='utf-8')
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read_text.__doc__ = Distribution.read_text.__doc__
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def locate_file(self, path):
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return self._path.parent / path
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@property
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def _normalized_name(self):
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"""
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Performance optimization: where possible, resolve the
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normalized name from the file system path.
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"""
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stem = os.path.basename(str(self._path))
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return (
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pass_none(Prepared.normalize)(self._name_from_stem(stem))
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or super()._normalized_name
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)
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@staticmethod
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def _name_from_stem(stem):
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"""
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>>> PathDistribution._name_from_stem('foo-3.0.egg-info')
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'foo'
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>>> PathDistribution._name_from_stem('CherryPy-3.0.dist-info')
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'CherryPy'
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>>> PathDistribution._name_from_stem('face.egg-info')
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'face'
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>>> PathDistribution._name_from_stem('foo.bar')
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"""
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filename, ext = os.path.splitext(stem)
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if ext not in ('.dist-info', '.egg-info'):
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return
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name, sep, rest = filename.partition('-')
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return name
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def distribution(distribution_name):
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"""Get the ``Distribution`` instance for the named package.
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:param distribution_name: The name of the distribution package as a string.
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:return: A ``Distribution`` instance (or subclass thereof).
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"""
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return Distribution.from_name(distribution_name)
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def distributions(**kwargs):
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"""Get all ``Distribution`` instances in the current environment.
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:return: An iterable of ``Distribution`` instances.
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"""
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return Distribution.discover(**kwargs)
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def metadata(distribution_name) -> _meta.PackageMetadata:
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"""Get the metadata for the named package.
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:param distribution_name: The name of the distribution package to query.
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:return: A PackageMetadata containing the parsed metadata.
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"""
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return Distribution.from_name(distribution_name).metadata
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|
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def version(distribution_name):
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"""Get the version string for the named package.
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:param distribution_name: The name of the distribution package to query.
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:return: The version string for the package as defined in the package's
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"Version" metadata key.
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"""
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return distribution(distribution_name).version
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|
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_unique = functools.partial(
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unique_everseen,
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key=_py39compat.normalized_name,
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)
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"""
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Wrapper for ``distributions`` to return unique distributions by name.
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"""
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def entry_points(**params) -> EntryPoints:
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"""Return EntryPoint objects for all installed packages.
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Pass selection parameters (group or name) to filter the
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result to entry points matching those properties (see
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EntryPoints.select()).
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:return: EntryPoints for all installed packages.
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"""
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eps = itertools.chain.from_iterable(
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dist.entry_points for dist in _unique(distributions())
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)
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return EntryPoints(eps).select(**params)
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|
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def files(distribution_name):
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"""Return a list of files for the named package.
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:param distribution_name: The name of the distribution package to query.
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:return: List of files composing the distribution.
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"""
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return distribution(distribution_name).files
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|
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def requires(distribution_name):
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"""
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Return a list of requirements for the named package.
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|
:return: An iterator of requirements, suitable for
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packaging.requirement.Requirement.
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"""
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return distribution(distribution_name).requires
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|
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def packages_distributions() -> Mapping[str, List[str]]:
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"""
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|
Return a mapping of top-level packages to their
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distributions.
|
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|
>>> import collections.abc
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>>> pkgs = packages_distributions()
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>>> all(isinstance(dist, collections.abc.Sequence) for dist in pkgs.values())
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True
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"""
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pkg_to_dist = collections.defaultdict(list)
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for dist in distributions():
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for pkg in _top_level_declared(dist) or _top_level_inferred(dist):
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pkg_to_dist[pkg].append(dist.metadata['Name'])
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return dict(pkg_to_dist)
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|
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def _top_level_declared(dist):
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return (dist.read_text('top_level.txt') or '').split()
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|
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def _top_level_inferred(dist):
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return {
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f.parts[0] if len(f.parts) > 1 else f.with_suffix('').name
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for f in always_iterable(dist.files)
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if f.suffix == ".py"
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}
|