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?? ..
?? __init__.py(511 B)
?? __pycache__
?? build_env.py(13.87 KB)
?? cache.py(10.1 KB)
?? cli
?? commands
?? configuration.py(14.23 KB)
?? distributions
?? exceptions.py(28.9 KB)
?? index
?? locations
?? main.py(338 B)
?? metadata
?? models
?? network
?? operations
?? pyproject.py(4.45 KB)
?? req
?? resolution
?? self_outdated_check.py(8.27 KB)
?? utils
?? vcs
?? wheel_builder.py(8.8 KB)

Editing: pyproject.py

from __future__ import annotations

import os
from collections import namedtuple
from typing import Any

from pip._vendor.packaging.requirements import InvalidRequirement

from pip._internal.exceptions import (
    InstallationError,
    InvalidPyProjectBuildRequires,
    MissingPyProjectBuildRequires,
)
from pip._internal.utils.compat import tomllib
from pip._internal.utils.packaging import get_requirement

def _is_list_of_str(obj: Any) -> bool:
    return isinstance(obj, list) and all(isinstance(item, str) for item in obj)

def make_pyproject_path(unpacked_source_directory: str) -> str:
    return os.path.join(unpacked_source_directory, "pyproject.toml")

BuildSystemDetails = namedtuple(
    "BuildSystemDetails", ["requires", "backend", "check", "backend_path"]
)

def load_pyproject_toml(
    pyproject_toml: str, setup_py: str, req_name: str
) -> BuildSystemDetails:
    """Load the pyproject.toml file.

Parameters:
        pyproject_toml - Location of the project's pyproject.toml file
        setup_py - Location of the project's setup.py file
        req_name - The name of the requirement we're processing (for
                   error reporting)

Returns:
        None if we should use the legacy code path, otherwise a tuple
        (
            requirements from pyproject.toml,
            name of PEP 517 backend,
            requirements we should check are installed after setting
                up the build environment
            directory paths to import the backend from (backend-path),
                relative to the project root.
        )
    """
    has_pyproject = os.path.isfile(pyproject_toml)
    has_setup = os.path.isfile(setup_py)

if not has_pyproject and not has_setup:
        raise InstallationError(
            f"{req_name} does not appear to be a Python project: "
            f"neither 'setup.py' nor 'pyproject.toml' found."
        )

if has_pyproject:
        with open(pyproject_toml, encoding="utf-8") as f:
            pp_toml = tomllib.loads(f.read())
        build_system = pp_toml.get("build-system")
    else:
        build_system = None

if build_system is None:
        # In the absence of any explicit backend specification, we
        # assume the setuptools backend that most closely emulates the
        # traditional direct setup.py execution, and require wheel and
        # a version of setuptools that supports that backend.

build_system = {
            "requires": ["setuptools>=40.8.0"],
            "build-backend": "setuptools.build_meta:__legacy__",
        }

# Ensure that the build-system section in pyproject.toml conforms
    # to PEP 518.

# Specifying the build-system table but not the requires key is invalid
    if "requires" not in build_system:
        raise MissingPyProjectBuildRequires(package=req_name)

# Error out if requires is not a list of strings
    requires = build_system["requires"]
    if not _is_list_of_str(requires):
        raise InvalidPyProjectBuildRequires(
            package=req_name,
            reason="It is not a list of strings.",
        )

# Each requirement must be valid as per PEP 508
    for requirement in requires:
        try:
            get_requirement(requirement)
        except InvalidRequirement as error:
            raise InvalidPyProjectBuildRequires(
                package=req_name,
                reason=f"It contains an invalid requirement: {requirement!r}",
            ) from error

backend = build_system.get("build-backend")
    backend_path = build_system.get("backend-path", [])
    check: list[str] = []
    if backend is None:
        # If the user didn't specify a backend, we assume they want to use
        # the setuptools backend. But we can't be sure they have included
        # a version of setuptools which supplies the backend. So we
        # make a note to check that this requirement is present once
        # we have set up the environment.
        # This is quite a lot of work to check for a very specific case. But
        # the problem is, that case is potentially quite common - projects that
        # adopted PEP 518 early for the ability to specify requirements to
        # execute setup.py, but never considered needing to mention the build
        # tools themselves. The original PEP 518 code had a similar check (but
        # implemented in a different way).
        backend = "setuptools.build_meta:__legacy__"
        check = ["setuptools>=40.8.0"]

return BuildSystemDetails(requires, backend, check, backend_path)

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