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markers.py

# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.

from __future__ import annotations

import operator
import os
import platform
import sys
from typing import AbstractSet, Any, Callable, Literal, TypedDict, Union, cast

from ._parser import MarkerAtom, MarkerList, Op, Value, Variable
from ._parser import parse_marker as _parse_marker
from ._tokenizer import ParserSyntaxError
from .specifiers import InvalidSpecifier, Specifier
from .utils import canonicalize_name

__all__ = [
    "EvaluateContext",
    "InvalidMarker",
    "Marker",
    "UndefinedComparison",
    "UndefinedEnvironmentName",
    "default_environment",
]

Operator = Callable[[str, Union[str, AbstractSet[str]]], bool]
EvaluateContext = Literal["metadata", "lock_file", "requirement"]
MARKERS_ALLOWING_SET = {"extras", "dependency_groups"}

class InvalidMarker(ValueError):
    """
    An invalid marker was found, users should refer to PEP 508.
    """

class UndefinedComparison(ValueError):
    """
    An invalid operation was attempted on a value that doesn't support it.
    """

class UndefinedEnvironmentName(ValueError):
    """
    A name was attempted to be used that does not exist inside of the
    environment.
    """

class Environment(TypedDict):
    implementation_name: str
    """The implementation's identifier, e.g. ``'cpython'``."""

implementation_version: str
    """
    The implementation's version, e.g. ``'3.13.0a2'`` for CPython 3.13.0a2, or
    ``'7.3.13'`` for PyPy3.10 v7.3.13.
    """

os_name: str
    """
    The value of :py:data:`os.name`. The name of the operating system dependent module
    imported, e.g. ``'posix'``.
    """

platform_machine: str
    """
    Returns the machine type, e.g. ``'i386'``.

An empty string if the value cannot be determined.
    """

platform_release: str
    """
    The system's release, e.g. ``'2.2.0'`` or ``'NT'``.

An empty string if the value cannot be determined.
    """

platform_system: str
    """
    The system/OS name, e.g. ``'Linux'``, ``'Windows'`` or ``'Java'``.

An empty string if the value cannot be determined.
    """

platform_version: str
    """
    The system's release version, e.g. ``'#3 on degas'``.

An empty string if the value cannot be determined.
    """

python_full_version: str
    """
    The Python version as string ``'major.minor.patchlevel'``.

Note that unlike the Python :py:data:`sys.version`, this value will always include
    the patchlevel (it defaults to 0).
    """

platform_python_implementation: str
    """
    A string identifying the Python implementation, e.g. ``'CPython'``.
    """

python_version: str
    """The Python version as string ``'major.minor'``."""

sys_platform: str
    """
    This string contains a platform identifier that can be used to append
    platform-specific components to :py:data:`sys.path`, for instance.

For Unix systems, except on Linux and AIX, this is the lowercased OS name as
    returned by ``uname -s`` with the first part of the version as returned by
    ``uname -r`` appended, e.g. ``'sunos5'`` or ``'freebsd8'``, at the time when Python
    was built.
    """

def _normalize_extra_values(results: Any) -> Any:
    """
    Normalize extra values.
    """
    if isinstance(results[0], tuple):
        lhs, op, rhs = results[0]
        if isinstance(lhs, Variable) and lhs.value == "extra":
            normalized_extra = canonicalize_name(rhs.value)
            rhs = Value(normalized_extra)
        elif isinstance(rhs, Variable) and rhs.value == "extra":
            normalized_extra = canonicalize_name(lhs.value)
            lhs = Value(normalized_extra)
        results[0] = lhs, op, rhs
    return results

def _format_marker(
    marker: list[str] | MarkerAtom | str, first: bool | None = True
) -> str:
    assert isinstance(marker, (list, tuple, str))

# Sometimes we have a structure like [[...]] which is a single item list
    # where the single item is itself it's own list. In that case we want skip
    # the rest of this function so that we don't get extraneous () on the
    # outside.
    if (
        isinstance(marker, list)
        and len(marker) == 1
        and isinstance(marker[0], (list, tuple))
    ):
        return _format_marker(marker[0])

if isinstance(marker, list):
        inner = (_format_marker(m, first=False) for m in marker)
        if first:
            return " ".join(inner)
        else:
            return "(" + " ".join(inner) + ")"
    elif isinstance(marker, tuple):
        return " ".join([m.serialize() for m in marker])
    else:
        return marker

_operators: dict[str, Operator] = {
    "in": lambda lhs, rhs: lhs in rhs,
    "not in": lambda lhs, rhs: lhs not in rhs,
    "<": operator.lt,
    "<=": operator.le,
    "==": operator.eq,
    "!=": operator.ne,
    ">=": operator.ge,
    ">": operator.gt,
}

def _eval_op(lhs: str, op: Op, rhs: str | AbstractSet[str]) -> bool:
    if isinstance(rhs, str):
        try:
            spec = Specifier("".join([op.serialize(), rhs]))
        except InvalidSpecifier:
            pass
        else:
            return spec.contains(lhs, prereleases=True)

oper: Operator | None = _operators.get(op.serialize())
    if oper is None:
        raise UndefinedComparison(f"Undefined {op!r} on {lhs!r} and {rhs!r}.")

return oper(lhs, rhs)

def _normalize(
    lhs: str, rhs: str | AbstractSet[str], key: str
) -> tuple[str, str | AbstractSet[str]]:
    # PEP 685 – Comparison of extra names for optional distribution dependencies
    # https://peps.python.org/pep-0685/
    # > When comparing extra names, tools MUST normalize the names being
    # > compared using the semantics outlined in PEP 503 for names
    if key == "extra":
        assert isinstance(rhs, str), "extra value must be a string"
        return (canonicalize_name(lhs), canonicalize_name(rhs))
    if key in MARKERS_ALLOWING_SET:
        if isinstance(rhs, str):  # pragma: no cover
            return (canonicalize_name(lhs), canonicalize_name(rhs))
        else:
            return (canonicalize_name(lhs), {canonicalize_name(v) for v in rhs})

# other environment markers don't have such standards
    return lhs, rhs

def _evaluate_markers(
    markers: MarkerList, environment: dict[str, str | AbstractSet[str]]
) -> bool:
    groups: list[list[bool]] = [[]]

for marker in markers:
        assert isinstance(marker, (list, tuple, str))

if isinstance(marker, list):
            groups[-1].append(_evaluate_markers(marker, environment))
        elif isinstance(marker, tuple):
            lhs, op, rhs = marker

if isinstance(lhs, Variable):
                environment_key = lhs.value
                lhs_value = environment[environment_key]
                rhs_value = rhs.value
            else:
                lhs_value = lhs.value
                environment_key = rhs.value
                rhs_value = environment[environment_key]
            assert isinstance(lhs_value, str), "lhs must be a string"
            lhs_value, rhs_value = _normalize(lhs_value, rhs_value, key=environment_key)
            groups[-1].append(_eval_op(lhs_value, op, rhs_value))
        else:
            assert marker in ["and", "or"]
            if marker == "or":
                groups.append([])

return any(all(item) for item in groups)

def format_full_version(info: sys._version_info) -> str:
    version = f"{info.major}.{info.minor}.{info.micro}"
    kind = info.releaselevel
    if kind != "final":
        version += kind[0] + str(info.serial)
    return version

def default_environment() -> Environment:
    iver = format_full_version(sys.implementation.version)
    implementation_name = sys.implementation.name
    return {
        "implementation_name": implementation_name,
        "implementation_version": iver,
        "os_name": os.name,
        "platform_machine": platform.machine(),
        "platform_release": platform.release(),
        "platform_system": platform.system(),
        "platform_version": platform.version(),
        "python_full_version": platform.python_version(),
        "platform_python_implementation": platform.python_implementation(),
        "python_version": ".".join(platform.python_version_tuple()[:2]),
        "sys_platform": sys.platform,
    }

class Marker:
    def __init__(self, marker: str) -> None:
        # Note: We create a Marker object without calling this constructor in
        #       packaging.requirements.Requirement. If any additional logic is
        #       added here, make sure to mirror/adapt Requirement.
        try:
            self._markers = _normalize_extra_values(_parse_marker(marker))
            # The attribute `_markers` can be described in terms of a recursive type:
            # MarkerList = List[Union[Tuple[Node, ...], str, MarkerList]]
            #
            # For example, the following expression:
            # python_version > "3.6" or (python_version == "3.6" and os_name == "unix")
            #
            # is parsed into:
            # [
            #     (<Variable('python_version')>, <Op('>')>, <Value('3.6')>),
            #     'and',
            #     [
            #         (<Variable('python_version')>, <Op('==')>, <Value('3.6')>),
            #         'or',
            #         (<Variable('os_name')>, <Op('==')>, <Value('unix')>)
            #     ]
            # ]
        except ParserSyntaxError as e:
            raise InvalidMarker(str(e)) from e

def __str__(self) -> str:
        return _format_marker(self._markers)

def __repr__(self) -> str:
        return f"<Marker('{self}')>"

def __hash__(self) -> int:
        return hash((self.__class__.__name__, str(self)))

def __eq__(self, other: Any) -> bool:
        if not isinstance(other, Marker):
            return NotImplemented

return str(self) == str(other)

def evaluate(
        self,
        environment: dict[str, str] | None = None,
        context: EvaluateContext = "metadata",
    ) -> bool:
        """Evaluate a marker.

Return the boolean from evaluating the given marker against the
        environment. environment is an optional argument to override all or
        part of the determined environment. The *context* parameter specifies what
        context the markers are being evaluated for, which influences what markers
        are considered valid. Acceptable values are "metadata" (for core metadata;
        default), "lock_file", and "requirement" (i.e. all other situations).

The environment is determined from the current Python process.
        """
        current_environment = cast(
            "dict[str, str | AbstractSet[str]]", default_environment()
        )
        if context == "lock_file":
            current_environment.update(
                extras=frozenset(), dependency_groups=frozenset()
            )
        elif context == "metadata":
            current_environment["extra"] = ""
        if environment is not None:
            current_environment.update(environment)
            # The API used to allow setting extra to None. We need to handle this
            # case for backwards compatibility.
            if "extra" in current_environment and current_environment["extra"] is None:
                current_environment["extra"] = ""

return _evaluate_markers(
            self._markers, _repair_python_full_version(current_environment)
        )

def _repair_python_full_version(
    env: dict[str, str | AbstractSet[str]],
) -> dict[str, str | AbstractSet[str]]:
    """
    Work around platform.python_version() returning something that is not PEP 440
    compliant for non-tagged Python builds.
    """
    python_full_version = cast(str, env["python_full_version"])
    if python_full_version.endswith("+"):
        env["python_full_version"] = f"{python_full_version}local"
    return env

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2026-02-06 10:01:01
..	dir	-	root/root	0755	2026-02-06 10:06:47
__pycache__	dir	-	root/root	0755	2026-02-06 10:01:01
licenses	dir	-	root/root	0755	2026-02-06 10:01:01
LICENSE	file	197 B	root/root	0644	2026-01-20 01:01:47
LICENSE.APACHE	file	9.94 KB	root/root	0644	2026-01-20 01:01:47
LICENSE.BSD	file	1.31 KB	root/root	0644	2026-01-20 01:01:47
__init__.py	file	494 B	root/root	0644	2026-01-20 01:01:47
_elffile.py	file	3.21 KB	root/root	0644	2026-01-20 01:01:47
_manylinux.py	file	9.37 KB	root/root	0644	2026-01-20 01:01:47
_musllinux.py	file	2.63 KB	root/root	0644	2026-01-20 01:01:47
_parser.py	file	9.98 KB	root/root	0644	2026-01-20 01:01:47
_structures.py	file	1.4 KB	root/root	0644	2026-01-20 01:01:47
_tokenizer.py	file	5.19 KB	root/root	0644	2026-01-20 01:01:47
markers.py	file	11.77 KB	root/root	0644	2026-01-20 01:01:47
metadata.py	file	33.92 KB	root/root	0644	2026-01-20 01:01:47
py.typed	file	0 B	root/root	0644	2026-01-20 01:01:47
requirements.py	file	2.88 KB	root/root	0644	2026-01-20 01:01:47
specifiers.py	file	39.14 KB	root/root	0644	2026-01-20 01:01:47
tags.py	file	22.21 KB	root/root	0644	2026-01-20 01:01:47
utils.py	file	4.93 KB	root/root	0644	2026-01-20 01:01:47
version.py	file	16.3 KB	root/root	0644	2026-01-20 01:01:47

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