How to use the pep517.wrappers.Pep517HookCaller function in pep517

"install",
            "--ignore-installed",
            "--prefix",
            self.path,
        ] + list(reqs)
        run(
            cmd,
            block=True,
            combine_stderr=True,
            return_object=False,
            write_to_stdout=False,
            nospin=True,
        )


class HookCaller(pep517.wrappers.Pep517HookCaller):
    def __init__(self, source_dir, build_backend, backend_path=None):
        self.source_dir = os.path.abspath(source_dir)
        self.build_backend = build_backend
        self._subprocess_runner = pep517_subprocess_runner
        if backend_path:
            backend_path = [
                pep517.wrappers.norm_and_check(self.source_dir, p) for p in backend_path
            ]
        self.backend_path = backend_path


def parse_special_directives(setup_entry, package_dir=None):
    # type: (S, Optional[STRING_TYPE]) -> S
    rv = setup_entry
    if not package_dir:
        package_dir = os.getcwd()

"install",
            "--ignore-installed",
            "--prefix",
            self.path,
        ] + list(reqs)
        run(
            cmd,
            block=True,
            combine_stderr=True,
            return_object=False,
            write_to_stdout=False,
            nospin=True,
        )


class HookCaller(pep517.wrappers.Pep517HookCaller):
    def __init__(self, source_dir, build_backend, backend_path=None):
        self.source_dir = os.path.abspath(source_dir)
        self.build_backend = build_backend
        self._subprocess_runner = pep517_subprocess_runner
        if backend_path:
            backend_path = [
                pep517.wrappers.norm_and_check(self.source_dir, p) for p in backend_path
            ]
        self.backend_path = backend_path


def parse_special_directives(setup_entry, package_dir=None):
    # type: (S, Optional[STRING_TYPE]) -> S
    rv = setup_entry
    if not package_dir:
        package_dir = os.getcwd()

shutil.copyfile(
                os.path.join(path, 'pyproject.toml'),
                os.path.join(output_path, 'pyproject.toml')
            )

            # Get build backend and requirements from pyproject.toml:
            with open(os.path.join(path, 'pyproject.toml')) as f:
                build_sys = pytoml.load(f)['build-system']
                backend = build_sys["build-backend"]
                build_requires.extend(build_sys["requires"])

            # Get a virtualenv with build requirements and get all metadata:
            env = BuildEnvironment()
            metadata = None
            with env:
                hooks = Pep517HookCaller(path, backend)
                env.pip_install([transform_dep_for_pip(req) for req in build_requires])
                reqs = hooks.get_requires_for_build_wheel({})
                env.pip_install([transform_dep_for_pip(req) for req in reqs])
                try:
                    metadata = hooks.prepare_metadata_for_build_wheel(path)
                except Exception:  # sadly, pep517 has no good error here
                    pass
            if metadata is not None:
                metadata_path = os.path.join(
                    path, metadata, "METADATA"
                )
        else:
            # This is a wheel, so metadata should be in *.dist-info folder:
            metadata_path = os.path.join(
                path,
                [f for f in os.listdir(path) if f.endswith(".dist-info")][0],