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stbi/Lib/site-packages/setuptools/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 setuptools
+import distutils
+from setuptools.py31compat import TemporaryDirectory
+
+from pkg_resources import parse_requirements
+from pkg_resources.py31compat import makedirs
+
+__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
+
+
+def _to_str(s):
+    """
+    Convert a filename to a string (on Python 2, explicitly
+    a byte string, not Unicode) as distutils checks for the
+    exact type str.
+    """
+    if sys.version_info[0] == 2 and not isinstance(s, str):
+        # Assume it's Unicode, as that's what the PEP says
+        # should be provided.
+        return s.encode(sys.getfilesystemencoding())
+    return s
+
+
+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',
+                                   _to_str(metadata_directory)]
+        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.
+        makedirs(result_directory, exist_ok=True)
+        with TemporaryDirectory(dir=result_directory) as tmp_dist_dir:
+            sys.argv = (sys.argv[:1] + setup_command +
+                        ['--dist-dir', tmp_dist_dir] +
+                        config_settings["--global-option"])
+            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)
+
+        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
+
+# 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()