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File Name : build_meta.py

"""A PEP 517 interface to setuptools

Previously, when a user or a command line tool (let's call it a "frontend")
needed to make a request of setuptools to take a certain action, for
example, generating a list of installation requirements, the frontend would
would call "setup.py egg_info" or "setup.py bdist_wheel" on the command line.

PEP 517 defines a different method of interfacing with setuptools. Rather
than calling "setup.py" directly, the frontend should:

1. Set the current directory to the directory with a setup.py file
  2. Import this module into a safe python interpreter (one in which
     setuptools can potentially set global variables or crash hard).
  3. Call one of the functions defined in PEP 517.

What each function does is defined in PEP 517. However, here is a "casual"
definition of the functions (this definition should not be relied on for
bug reports or API stability):

- `build_wheel`: build a wheel in the folder and return the basename
  - `get_requires_for_build_wheel`: get the `setup_requires` to build
  - `prepare_metadata_for_build_wheel`: get the `install_requires`
  - `build_sdist`: build an sdist in the folder and return the basename
  - `get_requires_for_build_sdist`: get the `setup_requires` to build

Again, this is not a formal definition! Just a "taste" of the module.
"""

import io
import os
import sys
import tokenize
import shutil
import contextlib
import tempfile

import setuptools
import distutils

from pkg_resources import parse_requirements

__all__ = ['get_requires_for_build_sdist',
           'get_requires_for_build_wheel',
           'prepare_metadata_for_build_wheel',
           'build_wheel',
           'build_sdist',
           '__legacy__',
           'SetupRequirementsError']

class SetupRequirementsError(BaseException):
    def __init__(self, specifiers):
        self.specifiers = specifiers

class Distribution(setuptools.dist.Distribution):
    def fetch_build_eggs(self, specifiers):
        specifier_list = list(map(str, parse_requirements(specifiers)))

raise SetupRequirementsError(specifier_list)

@classmethod
    @contextlib.contextmanager
    def patch(cls):
        """
        Replace
        distutils.dist.Distribution with this class
        for the duration of this context.
        """
        orig = distutils.core.Distribution
        distutils.core.Distribution = cls
        try:
            yield
        finally:
            distutils.core.Distribution = orig

@contextlib.contextmanager
def no_install_setup_requires():
    """Temporarily disable installing setup_requires

Under PEP 517, the backend reports build dependencies to the frontend,
    and the frontend is responsible for ensuring they're installed.
    So setuptools (acting as a backend) should not try to install them.
    """
    orig = setuptools._install_setup_requires
    setuptools._install_setup_requires = lambda attrs: None
    try:
        yield
    finally:
        setuptools._install_setup_requires = orig

def _get_immediate_subdirectories(a_dir):
    return [name for name in os.listdir(a_dir)
            if os.path.isdir(os.path.join(a_dir, name))]

def _file_with_extension(directory, extension):
    matching = (
        f for f in os.listdir(directory)
        if f.endswith(extension)
    )
    file, = matching
    return file

def _open_setup_script(setup_script):
    if not os.path.exists(setup_script):
        # Supply a default setup.py
        return io.StringIO(u"from setuptools import setup; setup()")

return getattr(tokenize, 'open', open)(setup_script)

class _BuildMetaBackend(object):

def _fix_config(self, config_settings):
        config_settings = config_settings or {}
        config_settings.setdefault('--global-option', [])
        return config_settings

def _get_build_requires(self, config_settings, requirements):
        config_settings = self._fix_config(config_settings)

sys.argv = sys.argv[:1] + ['egg_info'] + \
            config_settings["--global-option"]
        try:
            with Distribution.patch():
                self.run_setup()
        except SetupRequirementsError as e:
            requirements += e.specifiers

return requirements

def run_setup(self, setup_script='setup.py'):
        # Note that we can reuse our build directory between calls
        # Correctness comes first, then optimization later
        __file__ = setup_script
        __name__ = '__main__'

with _open_setup_script(__file__) as f:
            code = f.read().replace(r'\r\n', r'\n')

exec(compile(code, __file__, 'exec'), locals())

def get_requires_for_build_wheel(self, config_settings=None):
        config_settings = self._fix_config(config_settings)
        return self._get_build_requires(
            config_settings, requirements=['wheel'])

def get_requires_for_build_sdist(self, config_settings=None):
        config_settings = self._fix_config(config_settings)
        return self._get_build_requires(config_settings, requirements=[])

def prepare_metadata_for_build_wheel(self, metadata_directory,
                                         config_settings=None):
        sys.argv = sys.argv[:1] + [
            'dist_info', '--egg-base', metadata_directory]
        with no_install_setup_requires():
            self.run_setup()

dist_info_directory = metadata_directory
        while True:
            dist_infos = [f for f in os.listdir(dist_info_directory)
                          if f.endswith('.dist-info')]

if (
                len(dist_infos) == 0 and
                len(_get_immediate_subdirectories(dist_info_directory)) == 1
            ):

dist_info_directory = os.path.join(
                    dist_info_directory, os.listdir(dist_info_directory)[0])
                continue

assert len(dist_infos) == 1
            break

# PEP 517 requires that the .dist-info directory be placed in the
        # metadata_directory. To comply, we MUST copy the directory to the root
        if dist_info_directory != metadata_directory:
            shutil.move(
                os.path.join(dist_info_directory, dist_infos[0]),
                metadata_directory)
            shutil.rmtree(dist_info_directory, ignore_errors=True)

return dist_infos[0]

def _build_with_temp_dir(self, setup_command, result_extension,
                             result_directory, config_settings):
        config_settings = self._fix_config(config_settings)
        result_directory = os.path.abspath(result_directory)

# Build in a temporary directory, then copy to the target.
        os.makedirs(result_directory, exist_ok=True)
        with tempfile.TemporaryDirectory(dir=result_directory) as tmp_dist_dir:
            sys.argv = (sys.argv[:1] + setup_command +
                        ['--dist-dir', tmp_dist_dir] +
                        config_settings["--global-option"])
            with no_install_setup_requires():
                self.run_setup()

result_basename = _file_with_extension(
                tmp_dist_dir, result_extension)
            result_path = os.path.join(result_directory, result_basename)
            if os.path.exists(result_path):
                # os.rename will fail overwriting on non-Unix.
                os.remove(result_path)
            os.rename(os.path.join(tmp_dist_dir, result_basename), result_path)

return result_basename

def build_wheel(self, wheel_directory, config_settings=None,
                    metadata_directory=None):
        return self._build_with_temp_dir(['bdist_wheel'], '.whl',
                                         wheel_directory, config_settings)

def build_sdist(self, sdist_directory, config_settings=None):
        return self._build_with_temp_dir(['sdist', '--formats', 'gztar'],
                                         '.tar.gz', sdist_directory,
                                         config_settings)

class _BuildMetaLegacyBackend(_BuildMetaBackend):
    """Compatibility backend for setuptools

This is a version of setuptools.build_meta that endeavors
    to maintain backwards
    compatibility with pre-PEP 517 modes of invocation. It
    exists as a temporary
    bridge between the old packaging mechanism and the new
    packaging mechanism,
    and will eventually be removed.
    """
    def run_setup(self, setup_script='setup.py'):
        # In order to maintain compatibility with scripts assuming that
        # the setup.py script is in a directory on the PYTHONPATH, inject
        # '' into sys.path. (pypa/setuptools#1642)
        sys_path = list(sys.path)           # Save the original path

script_dir = os.path.dirname(os.path.abspath(setup_script))
        if script_dir not in sys.path:
            sys.path.insert(0, script_dir)

# Some setup.py scripts (e.g. in pygame and numpy) use sys.argv[0] to
        # get the directory of the source code. They expect it to refer to the
        # setup.py script.
        sys_argv_0 = sys.argv[0]
        sys.argv[0] = setup_script

try:
            super(_BuildMetaLegacyBackend,
                  self).run_setup(setup_script=setup_script)
        finally:
            # While PEP 517 frontends should be calling each hook in a fresh
            # subprocess according to the standard (and thus it should not be
            # strictly necessary to restore the old sys.path), we'll restore
            # the original path so that the path manipulation does not persist
            # within the hook after run_setup is called.
            sys.path[:] = sys_path
            sys.argv[0] = sys_argv_0

# The primary backend
_BACKEND = _BuildMetaBackend()

get_requires_for_build_wheel = _BACKEND.get_requires_for_build_wheel
get_requires_for_build_sdist = _BACKEND.get_requires_for_build_sdist
prepare_metadata_for_build_wheel = _BACKEND.prepare_metadata_for_build_wheel
build_wheel = _BACKEND.build_wheel
build_sdist = _BACKEND.build_sdist

# The legacy backend
__legacy__ = _BuildMetaLegacyBackend()

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	drwxr-xr-x	2025-12-14 03:10:10
..	dir	-	root/root	drwxr-xr-x	2026-06-03 03:35:25
__pycache__	dir	-	root/root	drwxr-xr-x	2025-12-14 03:10:10
_distutils	dir	-	root/root	drwxr-xr-x	2025-12-14 03:10:10
_vendor	dir	-	root/root	drwxr-xr-x	2025-12-14 03:10:10
command	dir	-	root/root	drwxr-xr-x	2025-12-14 03:10:10
extern	dir	-	root/root	drwxr-xr-x	2025-12-14 03:10:10
__init__.py	text/x-python	7.5 KB	root/root	-rw-r--r--	2025-09-21 06:46:16
_deprecation_warning.py	text/x-python	218 B	root/root	-rw-r--r--	2025-09-21 06:46:16
_imp.py	text/x-python	2.33 KB	root/root	-rw-r--r--	2025-09-21 06:46:16
archive_util.py	text/x-python	6.91 KB	root/root	-rw-r--r--	2025-09-21 06:46:16
build_meta.py	text/x-python	9.86 KB	root/root	-rw-r--r--	2025-09-21 06:46:16
config.py	text/x-python	21.23 KB	root/root	-rw-r--r--	2025-09-21 06:46:16
dep_util.py	text/x-python	949 B	root/root	-rw-r--r--	2025-09-21 06:46:16
depends.py	text/x-python	5.35 KB	root/root	-rw-r--r--	2025-09-21 06:46:16
dist.py	text/x-python	39.82 KB	root/root	-rw-r--r--	2025-09-21 06:46:16
errors.py	text/x-python	524 B	root/root	-rw-r--r--	2025-09-21 06:46:16
extension.py	text/x-python	1.64 KB	root/root	-rw-r--r--	2025-09-21 06:46:16
glob.py	text/plain	4.76 KB	root/root	-rw-r--r--	2025-09-21 06:46:16
installer.py	text/x-python	3.48 KB	root/root	-rw-r--r--	2025-09-21 06:46:16
launch.py	text/plain	812 B	root/root	-rw-r--r--	2025-09-21 06:46:16
lib2to3_ex.py	text/x-python	2.28 KB	root/root	-rw-r--r--	2025-09-21 06:46:16
monkey.py	text/x-python	5.09 KB	root/root	-rw-r--r--	2025-09-21 06:46:16
msvc.py	text/x-python	49.93 KB	root/root	-rw-r--r--	2025-09-21 06:46:16
namespaces.py	text/x-python	3.02 KB	root/root	-rw-r--r--	2025-09-21 06:46:16
package_index.py	text/x-python	39.92 KB	root/root	-rw-r--r--	2025-09-21 06:46:16
py34compat.py	text/x-python	245 B	root/root	-rw-r--r--	2025-09-21 06:46:16
sandbox.py	text/x-python	13.82 KB	root/root	-rw-r--r--	2025-09-21 06:46:16
script (dev).tmpl	text/plain	218 B	root/root	-rw-r--r--	2025-09-21 06:46:16
script.tmpl	text/plain	138 B	root/root	-rw-r--r--	2025-09-21 06:46:16
ssl_support.py	text/x-python	8.36 KB	root/root	-rw-r--r--	2025-09-21 06:46:16
unicode_utils.py	text/x-python	941 B	root/root	-rw-r--r--	2025-09-21 06:46:16
version.py	text/x-python	144 B	root/root	-rw-r--r--	2025-09-21 06:46:16
wheel.py	text/x-python	8.09 KB	root/root	-rw-r--r--	2025-09-21 06:46:16
windows_support.py	text/x-python	714 B	root/root	-rw-r--r--	2025-09-21 06:46:16