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from functools import partial
from glob import glob
from distutils.util import convert_path
import distutils.command.build_py as orig
import os
import fnmatch
import textwrap
import distutils.errors
import itertools
import stat
from pathlib import Path
from typing import Dict, Iterable, Iterator, List, Optional, Tuple

from ..extern.more_itertools import unique_everseen
from ..warnings import SetuptoolsDeprecationWarning


_IMPLICIT_DATA_FILES = ('*.pyi', 'py.typed')


def make_writable(target):
    os.chmod(target, os.stat(target).st_mode | stat.S_IWRITE)


class build_py(orig.build_py):
    """Enhanced 'build_py' command that includes data files with packages

    The data files are specified via a 'package_data' argument to 'setup()'.
    See 'setuptools.dist.Distribution' for more details.

    Also, this version of the 'build_py' command allows you to specify both
    'py_modules' and 'packages' in the same setup operation.
    """

    editable_mode: bool = False
    existing_egg_info_dir: Optional[str] = None  #: Private API, internal use only.

    def finalize_options(self):
        orig.build_py.finalize_options(self)
        self.package_data = self.distribution.package_data
        self.exclude_package_data = self.distribution.exclude_package_data or {}
        if 'data_files' in self.__dict__:
            del self.__dict__['data_files']
        self.__updated_files = []

    def copy_file(
        self, infile, outfile, preserve_mode=1, preserve_times=1, link=None, level=1
    ):
        # Overwrite base class to allow using links
        if link:
            infile = str(Path(infile).resolve())
            outfile = str(Path(outfile).resolve())
        return super().copy_file(
            infile, outfile, preserve_mode, preserve_times, link, level
        )

    def run(self):
        """Build modules, packages, and copy data files to build directory"""
        if not (self.py_modules or self.packages) or self.editable_mode:
            return

        if self.py_modules:
            self.build_modules()

        if self.packages:
            self.build_packages()
            self.build_package_data()

        # Only compile actual .py files, using our base class' idea of what our
        # output files are.
        self.byte_compile(orig.build_py.get_outputs(self, include_bytecode=0))

    def __getattr__(self, attr):
        "lazily compute data files"
        if attr == 'data_files':
            self.data_files = self._get_data_files()
            return self.data_files
        return orig.build_py.__getattr__(self, attr)

    def build_module(self, module, module_file, package):
        outfile, copied = orig.build_py.build_module(self, module, module_file, package)
        if copied:
            self.__updated_files.append(outfile)
        return outfile, copied

    def _get_data_files(self):
        """Generate list of '(package,src_dir,build_dir,filenames)' tuples"""
        self.analyze_manifest()
        return list(map(self._get_pkg_data_files, self.packages or ()))

    def get_data_files_without_manifest(self):
        """
        Generate list of ``(package,src_dir,build_dir,filenames)`` tuples,
        but without triggering any attempt to analyze or build the manifest.
        """
        # Prevent eventual errors from unset `manifest_files`
        # (that would otherwise be set by `analyze_manifest`)
        self.__dict__.setdefault('manifest_files', {})
        return list(map(self._get_pkg_data_files, self.packages or ()))

    def _get_pkg_data_files(self, package):
        # Locate package source directory
        src_dir = self.get_package_dir(package)

        # Compute package build directory
        build_dir = os.path.join(*([self.build_lib] + package.split('.')))

        # Strip directory from globbed filenames
        filenames = [
            os.path.relpath(file, src_dir)
            for file in self.find_data_files(package, src_dir)
        ]
        return package, src_dir, build_dir, filenames

    def find_data_files(self, package, src_dir):
        """Return filenames for package's data files in 'src_dir'"""
        patterns = self._get_platform_patterns(
            self.package_data,
            package,
            src_dir,
            extra_patterns=_IMPLICIT_DATA_FILES,
        )
        globs_expanded = map(partial(glob, recursive=True), patterns)
        # flatten the expanded globs into an iterable of matches
        globs_matches = itertools.chain.from_iterable(globs_expanded)
        glob_files = filter(os.path.isfile, globs_matches)
        files = itertools.chain(
            self.manifest_files.get(package, []),
            glob_files,
        )
        return self.exclude_data_files(package, src_dir, files)

    def get_outputs(self, include_bytecode=1) -> List[str]:
        """See :class:`setuptools.commands.build.SubCommand`"""
        if self.editable_mode:
            return list(self.get_output_mapping().keys())
        return super().get_outputs(include_bytecode)

    def get_output_mapping(self) -> Dict[str, str]:
        """See :class:`setuptools.commands.build.SubCommand`"""
        mapping = itertools.chain(
            self._get_package_data_output_mapping(),
            self._get_module_mapping(),
        )
        return dict(sorted(mapping, key=lambda x: x[0]))

    def _get_module_mapping(self) -> Iterator[Tuple[str, str]]:
        """Iterate over all modules producing (dest, src) pairs."""
        for package, module, module_file in self.find_all_modules():
            package = package.split('.')
            filename = self.get_module_outfile(self.build_lib, package, module)
            yield (filename, module_file)

    def _get_package_data_output_mapping(self) -> Iterator[Tuple[str, str]]:
        """Iterate over package data producing (dest, src) pairs."""
        for package, src_dir, build_dir, filenames in self.data_files:
            for filename in filenames:
                target = os.path.join(build_dir, filename)
                srcfile = os.path.join(src_dir, filename)
                yield (target, srcfile)

    def build_package_data(self):
        """Copy data files into build directory"""
        for target, srcfile in self._get_package_data_output_mapping():
            self.mkpath(os.path.dirname(target))
            _outf, _copied = self.copy_file(srcfile, target)
            make_writable(target)

    def analyze_manifest(self):
        self.manifest_files = mf = {}
        if not self.distribution.include_package_data:
            return
        src_dirs = {}
        for package in self.packages or ():
            # Locate package source directory
            src_dirs[assert_relative(self.get_package_dir(package))] = package

        if (
            getattr(self, 'existing_egg_info_dir', None)
            and Path(self.existing_egg_info_dir, "SOURCES.txt").exists()
        ):
            egg_info_dir = self.existing_egg_info_dir
            manifest = Path(egg_info_dir, "SOURCES.txt")
            files = manifest.read_text(encoding="utf-8").splitlines()
        else:
            self.run_command('egg_info')
            ei_cmd = self.get_finalized_command('egg_info')
            egg_info_dir = ei_cmd.egg_info
            files = ei_cmd.filelist.files

        check = _IncludePackageDataAbuse()
        for path in self._filter_build_files(files, egg_info_dir):
            d, f = os.path.split(assert_relative(path))
            prev = None
            oldf = f
            while d and d != prev and d not in src_dirs:
                prev = d
                d, df = os.path.split(d)
                f = os.path.join(df, f)
            if d in src_dirs:
                if f == oldf:
                    if check.is_module(f):
                        continue  # it's a module, not data
                else:
                    importable = check.importable_subpackage(src_dirs[d], f)
                    if importable:
                        check.warn(importable)
                mf.setdefault(src_dirs[d], []).append(path)

    def _filter_build_files(self, files: Iterable[str], egg_info: str) -> Iterator[str]:
        """
        ``build_meta`` may try to create egg_info outside of the project directory,
        and this can be problematic for certain plugins (reported in issue #3500).

        Extensions might also include between their sources files created on the
        ``build_lib`` and ``build_temp`` directories.

        This function should filter this case of invalid files out.
        """
        build = self.get_finalized_command("build")
        build_dirs = (egg_info, self.build_lib, build.build_temp, build.build_base)
        norm_dirs = [os.path.normpath(p) for p in build_dirs if p]

        for file in files:
            norm_path = os.path.normpath(file)
            if not os.path.isabs(file) or all(d not in norm_path for d in norm_dirs):
                yield file

    def get_data_files(self):
        pass  # Lazily compute data files in _get_data_files() function.

    def check_package(self, package, package_dir):
        """Check namespace packages' __init__ for declare_namespace"""
        try:
            return self.packages_checked[package]
        except KeyError:
            pass

        init_py = orig.build_py.check_package(self, package, package_dir)
        self.packages_checked[package] = init_py

        if not init_py or not self.distribution.namespace_packages:
            return init_py

        for pkg in self.distribution.namespace_packages:
            if pkg == package or pkg.startswith(package + '.'):
                break
        else:
            return init_py

        with open(init_py, 'rb') as f:
            contents = f.read()
        if b'declare_namespace' not in contents:
            raise distutils.errors.DistutilsError(
                "Namespace package problem: %s is a namespace package, but "
                "its\n__init__.py does not call declare_namespace()! Please "
                'fix it.\n(See the setuptools manual under '
                '"Namespace Packages" for details.)\n"' % (package,)
            )
        return init_py

    def initialize_options(self):
        self.packages_checked = {}
        orig.build_py.initialize_options(self)
        self.editable_mode = False
        self.existing_egg_info_dir = None

    def get_package_dir(self, package):
        res = orig.build_py.get_package_dir(self, package)
        if self.distribution.src_root is not None:
            return os.path.join(self.distribution.src_root, res)
        return res

    def exclude_data_files(self, package, src_dir, files):
        """Filter filenames for package's data files in 'src_dir'"""
        files = list(files)
        patterns = self._get_platform_patterns(
            self.exclude_package_data,
            package,
            src_dir,
        )
        match_groups = (fnmatch.filter(files, pattern) for pattern in patterns)
        # flatten the groups of matches into an iterable of matches
        matches = itertools.chain.from_iterable(match_groups)
        bad = set(matches)
        keepers = (fn for fn in files if fn not in bad)
        # ditch dupes
        return list(unique_everseen(keepers))

    @staticmethod
    def _get_platform_patterns(spec, package, src_dir, extra_patterns=[]):
        """
        yield platform-specific path patterns (suitable for glob
        or fn_match) from a glob-based spec (such as
        self.package_data or self.exclude_package_data)
        matching package in src_dir.
        """
        raw_patterns = itertools.chain(
            extra_patterns,
            spec.get('', []),
            spec.get(package, []),
        )
        return (
            # Each pattern has to be converted to a platform-specific path
            os.path.join(src_dir, convert_path(pattern))
            for pattern in raw_patterns
        )


def assert_relative(path):
    if not os.path.isabs(path):
        return path
    from distutils.errors import DistutilsSetupError

    msg = (
        textwrap.dedent(
            """
        Error: setup script specifies an absolute path:

            %s

        setup() arguments must *always* be /-separated paths relative to the
        setup.py directory, *never* absolute paths.
        """
        ).lstrip()
        % path
    )
    raise DistutilsSetupError(msg)


class _IncludePackageDataAbuse:
    """Inform users that package or module is included as 'data file'"""

    class _Warning(SetuptoolsDeprecationWarning):
        _SUMMARY = """
        Package {importable!r} is absent from the `packages` configuration.
        """

        _DETAILS = """
        ############################
        # Package would be ignored #
        ############################
        Python recognizes {importable!r} as an importable package[^1],
        but it is absent from setuptools' `packages` configuration.

        This leads to an ambiguous overall configuration. If you want to distribute this
        package, please make sure that {importable!r} is explicitly added
        to the `packages` configuration field.

        Alternatively, you can also rely on setuptools' discovery methods
        (for example by using `find_namespace_packages(...)`/`find_namespace:`
        instead of `find_packages(...)`/`find:`).

        You can read more about "package discovery" on setuptools documentation page:

        - https://setuptools.pypa.io/en/latest/userguide/package_discovery.html

        If you don't want {importable!r} to be distributed and are
        already explicitly excluding {importable!r} via
        `find_namespace_packages(...)/find_namespace` or `find_packages(...)/find`,
        you can try to use `exclude_package_data`, or `include-package-data=False` in
        combination with a more fine grained `package-data` configuration.

        You can read more about "package data files" on setuptools documentation page:

        - https://setuptools.pypa.io/en/latest/userguide/datafiles.html


        [^1]: For Python, any directory (with suitable naming) can be imported,
              even if it does not contain any `.py` files.
              On the other hand, currently there is no concept of package data
              directory, all directories are treated like packages.
        """
        # _DUE_DATE: still not defined as this is particularly controversial.
        # Warning initially introduced in May 2022. See issue #3340 for discussion.

    def __init__(self):
        self._already_warned = set()

    def is_module(self, file):
        return file.endswith(".py") and file[: -len(".py")].isidentifier()

    def importable_subpackage(self, parent, file):
        pkg = Path(file).parent
        parts = list(itertools.takewhile(str.isidentifier, pkg.parts))
        if parts:
            return ".".join([parent, *parts])
        return None

    def warn(self, importable):
        if importable not in self._already_warned:
            self._Warning.emit(importable=importable)
            self._already_warned.add(importable)

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