FM / distlib

/usr/local/lib/python3.6/site-packages/distlib/

/usr/local/lib/python3.6/site-packages/distlib

Name	Size	Mode	Actions
__pycache__/	-	0755	rm
compat.py	41467	0644	edit dl rm
database.py	51160	0644	edit dl rm
index.py	20797	0644	edit dl rm
locators.py	51026	0644	edit dl rm
manifest.py	14168	0644	edit dl rm
markers.py	5164	0644	edit dl rm
metadata.py	38724	0644	edit dl rm
resources.py	10820	0644	edit dl rm
scripts.py	18608	0644	edit dl rm
t32.exe	97792	0644	edit dl rm
t64-arm.exe	182784	0644	edit dl rm
t64.exe	108032	0644	edit dl rm
util.py	66682	0644	edit dl rm
version.py	23727	0644	edit dl rm
w32.exe	91648	0644	edit dl rm
w64-arm.exe	168448	0644	edit dl rm
w64.exe	101888	0644	edit dl rm
wheel.py	43979	0644	edit dl rm
__init__.py	625	0644	edit dl rm

Edit: /usr/local/lib/python3.6/site-packages/distlib/markers.py (5164B)

# -*- coding: utf-8 -*-
#
# Copyright (C) 2012-2023 Vinay Sajip.
# Licensed to the Python Software Foundation under a contributor agreement.
# See LICENSE.txt and CONTRIBUTORS.txt.
#
"""
Parser for the environment markers micro-language defined in PEP 508.
"""

# Note: In PEP 345, the micro-language was Python compatible, so the ast
# module could be used to parse it. However, PEP 508 introduced operators such
# as ~= and === which aren't in Python, necessitating a different approach.

import os
import re
import sys
import platform

from .compat import string_types
from .util import in_venv, parse_marker
from .version import LegacyVersion as LV

__all__ = ['interpret']

_VERSION_PATTERN = re.compile(r'((\d+(\.\d+)*\w*)|\'(\d+(\.\d+)*\w*)\'|\"(\d+(\.\d+)*\w*)\")')
_VERSION_MARKERS = {'python_version', 'python_full_version'}

def _is_version_marker(s):
    return isinstance(s, string_types) and s in _VERSION_MARKERS

def _is_literal(o):
    if not isinstance(o, string_types) or not o:
        return False
    return o[0] in '\'"'

def _get_versions(s):
    return {LV(m.groups()[0]) for m in _VERSION_PATTERN.finditer(s)}

class Evaluator(object):
    """
    This class is used to evaluate marker expressions.
    """

operations = {
        '==': lambda x, y: x == y,
        '===': lambda x, y: x == y,
        '~=': lambda x, y: x == y or x > y,
        '!=': lambda x, y: x != y,
        '<': lambda x, y: x < y,
        '<=': lambda x, y: x == y or x < y,
        '>': lambda x, y: x > y,
        '>=': lambda x, y: x == y or x > y,
        'and': lambda x, y: x and y,
        'or': lambda x, y: x or y,
        'in': lambda x, y: x in y,
        'not in': lambda x, y: x not in y,
    }

def evaluate(self, expr, context):
        """
        Evaluate a marker expression returned by the :func:`parse_requirement`
        function in the specified context.
        """
        if isinstance(expr, string_types):
            if expr[0] in '\'"':
                result = expr[1:-1]
            else:
                if expr not in context:
                    raise SyntaxError('unknown variable: %s' % expr)
                result = context[expr]
        else:
            assert isinstance(expr, dict)
            op = expr['op']
            if op not in self.operations:
                raise NotImplementedError('op not implemented: %s' % op)
            elhs = expr['lhs']
            erhs = expr['rhs']
            if _is_literal(expr['lhs']) and _is_literal(expr['rhs']):
                raise SyntaxError('invalid comparison: %s %s %s' % (elhs, op, erhs))

lhs = self.evaluate(elhs, context)
            rhs = self.evaluate(erhs, context)
            if ((_is_version_marker(elhs) or _is_version_marker(erhs)) and
                    op in ('<', '<=', '>', '>=', '===', '==', '!=', '~=')):
                lhs = LV(lhs)
                rhs = LV(rhs)
            elif _is_version_marker(elhs) and op in ('in', 'not in'):
                lhs = LV(lhs)
                rhs = _get_versions(rhs)
            result = self.operations[op](lhs, rhs)
        return result

_DIGITS = re.compile(r'\d+\.\d+')

def default_context():

def format_full_version(info):
        version = '%s.%s.%s' % (info.major, info.minor, info.micro)
        kind = info.releaselevel
        if kind != 'final':
            version += kind[0] + str(info.serial)
        return version

if hasattr(sys, 'implementation'):
        implementation_version = format_full_version(sys.implementation.version)
        implementation_name = sys.implementation.name
    else:
        implementation_version = '0'
        implementation_name = ''

ppv = platform.python_version()
    m = _DIGITS.match(ppv)
    pv = m.group(0)
    result = {
        'implementation_name': implementation_name,
        'implementation_version': implementation_version,
        'os_name': os.name,
        'platform_machine': platform.machine(),
        'platform_python_implementation': platform.python_implementation(),
        'platform_release': platform.release(),
        'platform_system': platform.system(),
        'platform_version': platform.version(),
        'platform_in_venv': str(in_venv()),
        'python_full_version': ppv,
        'python_version': pv,
        'sys_platform': sys.platform,
    }
    return result

DEFAULT_CONTEXT = default_context()
del default_context

evaluator = Evaluator()

def interpret(marker, execution_context=None):
    """
    Interpret a marker and return a result depending on environment.

:param marker: The marker to interpret.
    :type marker: str
    :param execution_context: The context used for name lookup.
    :type execution_context: mapping
    """
    try:
        expr, rest = parse_marker(marker)
    except Exception as e:
        raise SyntaxError('Unable to interpret marker syntax: %s: %s' % (marker, e))
    if rest and rest[0] != '#':
        raise SyntaxError('unexpected trailing data in marker: %s: %s' % (marker, rest))
    context = dict(DEFAULT_CONTEXT)
    if execution_context:
        context.update(execution_context)
    return evaluator.evaluate(expr, context)

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