text: __all__ = ['Distribution']
  
  import re
  from distutils.core import Distribution as _Distribution
  from setuptools.depends import Require
  from setuptools.command.install import install
  from setuptools.command.sdist import sdist
  from setuptools.command.install_lib import install_lib
  from distutils.errors import DistutilsOptionError, DistutilsPlatformError
  from distutils.errors import DistutilsSetupError
  import setuptools, pkg_resources, distutils.core, distutils.dist, distutils.cmd
  import os, distutils.log
  
  def _get_unpatched(cls):
      """Protect against re-patching the distutils if reloaded
  
      Also ensures that no other distutils extension monkeypatched the distutils
      first.
      """
      while cls.__module__.startswith('setuptools'):
          cls, = cls.__bases__
      if not cls.__module__.startswith('distutils'):
          raise AssertionError(
              "distutils has already been patched by %r" % cls
          )
      return cls
  
  _Distribution = _get_unpatched(_Distribution)
  
  sequence = tuple, list
  
  def check_importable(dist, attr, value):
      try:
          ep = pkg_resources.EntryPoint.parse('x='+value)
          assert not ep.extras
      except (TypeError,ValueError,AttributeError,AssertionError):
          raise DistutilsSetupError(
              "%r must be importable 'module:attrs' string (got %r)"
              % (attr,value)
          )
  
  
  def assert_string_list(dist, attr, value):
      """Verify that value is a string list or None"""
      try:
          assert ''.join(value)!=value
      except (TypeError,ValueError,AttributeError,AssertionError):
          raise DistutilsSetupError(
              "%r must be a list of strings (got %r)" % (attr,value)
          )
  
  def check_nsp(dist, attr, value):
      """Verify that namespace packages are valid"""
      assert_string_list(dist,attr,value)
      for nsp in value:
          if not dist.has_contents_for(nsp):
              raise DistutilsSetupError(
                  "Distribution contains no modules or packages for " +
                  "namespace package %r" % nsp
              )
          if '.' in nsp:
              parent = '.'.join(nsp.split('.')[:-1])
              if parent not in value:
                  distutils.log.warn(
                      "%r is declared as a package namespace, but %r is not:"
                      " please correct this in setup.py", nsp, parent
                  )
  
  def check_extras(dist, attr, value):
      """Verify that extras_require mapping is valid"""
      try:
          for k,v in list(value.items()):
              list(pkg_resources.parse_requirements(v))
      except (TypeError,ValueError,AttributeError):
          raise DistutilsSetupError(
              "'extras_require' must be a dictionary whose values are "
              "strings or lists of strings containing valid project/version "
              "requirement specifiers."
          )
  
  
  
  
  def assert_bool(dist, attr, value):
      """Verify that value is True, False, 0, or 1"""
      if bool(value) != value:
          raise DistutilsSetupError(
              "%r must be a boolean value (got %r)" % (attr,value)
          )
  def check_requirements(dist, attr, value):
      """Verify that install_requires is a valid requirements list"""
      try:
          list(pkg_resources.parse_requirements(value))
      except (TypeError,ValueError):
          raise DistutilsSetupError(
              "%r must be a string or list of strings "
              "containing valid project/version requirement specifiers" % (attr,)
          )
  def check_entry_points(dist, attr, value):
      """Verify that entry_points map is parseable"""
      try:
          pkg_resources.EntryPoint.parse_map(value)
      except ValueError as e:
          raise DistutilsSetupError(e)
  
  def check_test_suite(dist, attr, value):
      if not isinstance(value,str):
          raise DistutilsSetupError("test_suite must be a string")
  
  def check_package_data(dist, attr, value):
      """Verify that value is a dictionary of package names to glob lists"""
      if isinstance(value,dict):
          for k,v in list(value.items()):
              if not isinstance(k,str): break
              try: iter(v)
              except TypeError:
                  break
          else:
              return
      raise DistutilsSetupError(
          attr+" must be a dictionary mapping package names to lists of "
          "wildcard patterns"
      )
  
  class Distribution(_Distribution):
      """Distribution with support for features, tests, and package data
  
      This is an enhanced version of 'distutils.dist.Distribution' that
      effectively adds the following new optional keyword arguments to 'setup()':
  
       'install_requires' -- a string or sequence of strings specifying project
          versions that the distribution requires when installed, in the format
          used by 'pkg_resources.require()'.  They will be installed
          automatically when the package is installed.  If you wish to use
          packages that are not available in PyPI, or want to give your users an
          alternate download location, you can add a 'find_links' option to the
          '[easy_install]' section of your project's 'setup.cfg' file, and then
          setuptools will scan the listed web pages for links that satisfy the
          requirements.
  
       'extras_require' -- a dictionary mapping names of optional "extras" to the
          additional requirement(s) that using those extras incurs. For example,
          this::
  
              extras_require = dict(reST = ["docutils>=0.3", "reSTedit"])
  
          indicates that the distribution can optionally provide an extra
          capability called "reST", but it can only be used if docutils and
          reSTedit are installed.  If the user installs your package using
          EasyInstall and requests one of your extras, the corresponding
          additional requirements will be installed if needed.
  
       'features' -- a dictionary mapping option names to 'setuptools.Feature'
          objects.  Features are a portion of the distribution that can be
          included or excluded based on user options, inter-feature dependencies,
          and availability on the current system.  Excluded features are omitted
          from all setup commands, including source and binary distributions, so
          you can create multiple distributions from the same source tree.
          Feature names should be valid Python identifiers, except that they may
          contain the '-' (minus) sign.  Features can be included or excluded
          via the command line options '--with-X' and '--without-X', where 'X' is
          the name of the feature.  Whether a feature is included by default, and
          whether you are allowed to control this from the command line, is
          determined by the Feature object.  See the 'Feature' class for more
          information.
  
       'test_suite' -- the name of a test suite to run for the 'test' command.
          If the user runs 'python setup.py test', the package will be installed,
          and the named test suite will be run.  The format is the same as
          would be used on a 'unittest.py' command line.  That is, it is the
          dotted name of an object to import and call to generate a test suite.
  
       'package_data' -- a dictionary mapping package names to lists of filenames
          or globs to use to find data files contained in the named packages.
          If the dictionary has filenames or globs listed under '""' (the empty
          string), those names will be searched for in every package, in addition
          to any names for the specific package.  Data files found using these
          names/globs will be installed along with the package, in the same
          location as the package.  Note that globs are allowed to reference
          the contents of non-package subdirectories, as long as you use '/' as
          a path separator.  (Globs are automatically converted to
          platform-specific paths at runtime.)
  
      In addition to these new keywords, this class also has several new methods
      for manipulating the distribution's contents.  For example, the 'include()'
      and 'exclude()' methods can be thought of as in-place add and subtract
      commands that add or remove packages, modules, extensions, and so on from
      the distribution.  They are used by the feature subsystem to configure the
      distribution for the included and excluded features.
      """
  
      _patched_dist = None
  
      def patch_missing_pkg_info(self, attrs):
          # Fake up a replacement for the data that would normally come from
          # PKG-INFO, but which might not yet be built if this is a fresh
          # checkout.
          #
          if not attrs or 'name' not in attrs or 'version' not in attrs:
              return
          key = pkg_resources.safe_name(str(attrs['name'])).lower()
          dist = pkg_resources.working_set.by_key.get(key)
          if dist is not None and not dist.has_metadata('PKG-INFO'):
              dist._version = pkg_resources.safe_version(str(attrs['version']))
              self._patched_dist = dist
  
      def __init__ (self, attrs=None):
          have_package_data = hasattr(self, "package_data")
          if not have_package_data:
              self.package_data = {}
          self.require_features = []
          self.features = {}
          self.dist_files = []
          self.src_root = attrs and attrs.pop("src_root", None)
          self.patch_missing_pkg_info(attrs)
          # Make sure we have any eggs needed to interpret 'attrs'
          if attrs is not None:
              self.dependency_links = attrs.pop('dependency_links', [])
              assert_string_list(self,'dependency_links',self.dependency_links)
          if attrs and 'setup_requires' in attrs:
              self.fetch_build_eggs(attrs.pop('setup_requires'))
          for ep in pkg_resources.iter_entry_points('distutils.setup_keywords'):
              if not hasattr(self,ep.name):
                  setattr(self,ep.name,None)
          _Distribution.__init__(self,attrs)
          if isinstance(self.metadata.version, (int,float)):
              # Some people apparently take "version number" too literally :)
              self.metadata.version = str(self.metadata.version)
  
      def parse_command_line(self):
          """Process features after parsing command line options"""
          result = _Distribution.parse_command_line(self)
          if self.features:
              self._finalize_features()
          return result
  
      def _feature_attrname(self,name):
          """Convert feature name to corresponding option attribute name"""
          return 'with_'+name.replace('-','_')
  
      def fetch_build_eggs(self, requires):
          """Resolve pre-setup requirements"""
          from pkg_resources import working_set, parse_requirements
          for dist in working_set.resolve(
              parse_requirements(requires), installer=self.fetch_build_egg,
              replace_conflicting=True
          ):
              working_set.add(dist, replace=True)
  
      def finalize_options(self):
          _Distribution.finalize_options(self)
          if self.features:
              self._set_global_opts_from_features()
  
          for ep in pkg_resources.iter_entry_points('distutils.setup_keywords'):
              value = getattr(self,ep.name,None)
              if value is not None:
                  ep.require(installer=self.fetch_build_egg)
                  ep.load()(self, ep.name, value)
          if getattr(self, 'convert_2to3_doctests', None):
              # XXX may convert to set here when we can rely on set being builtin
              self.convert_2to3_doctests = [os.path.abspath(p) for p in self.convert_2to3_doctests]
          else:
              self.convert_2to3_doctests = []
  
      def fetch_build_egg(self, req):
          """Fetch an egg needed for building"""
  
          try:
              cmd = self._egg_fetcher
              cmd.package_index.to_scan = []
          except AttributeError:
              from setuptools.command.easy_install import easy_install
              dist = self.__class__({'script_args':['easy_install']})
              dist.parse_config_files()
              opts = dist.get_option_dict('easy_install')
              keep = (
                  'find_links', 'site_dirs', 'index_url', 'optimize',
                  'site_dirs', 'allow_hosts'
              )
              for key in list(opts.keys()):
                  if key not in keep:
                      del opts[key]   # don't use any other settings
              if self.dependency_links:
                  links = self.dependency_links[:]
                  if 'find_links' in opts:
                      links = opts['find_links'][1].split() + links
                  opts['find_links'] = ('setup', links)
              cmd = easy_install(
                  dist, args=["x"], install_dir=os.curdir, exclude_scripts=True,
                  always_copy=False, build_directory=None, editable=False,
                  upgrade=False, multi_version=True, no_report=True, user=False
              )
              cmd.ensure_finalized()
              self._egg_fetcher = cmd
          return cmd.easy_install(req)
  
      def _set_global_opts_from_features(self):
          """Add --with-X/--without-X options based on optional features"""
  
          go = []
          no = self.negative_opt.copy()
  
          for name,feature in list(self.features.items()):
              self._set_feature(name,None)
              feature.validate(self)
  
              if feature.optional:
                  descr = feature.description
                  incdef = ' (default)'
                  excdef=''
                  if not feature.include_by_default():
                      excdef, incdef = incdef, excdef
  
                  go.append(('with-'+name, None, 'include '+descr+incdef))
                  go.append(('without-'+name, None, 'exclude '+descr+excdef))
                  no['without-'+name] = 'with-'+name
  
          self.global_options = self.feature_options = go + self.global_options
          self.negative_opt = self.feature_negopt = no
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
      def _finalize_features(self):
          """Add/remove features and resolve dependencies between them"""
  
          # First, flag all the enabled items (and thus their dependencies)
          for name,feature in list(self.features.items()):
              enabled = self.feature_is_included(name)
              if enabled or (enabled is None and feature.include_by_default()):
                  feature.include_in(self)
                  self._set_feature(name,1)
  
          # Then disable the rest, so that off-by-default features don't
          # get flagged as errors when they're required by an enabled feature
          for name,feature in list(self.features.items()):
              if not self.feature_is_included(name):
                  feature.exclude_from(self)
                  self._set_feature(name,0)
  
  
      def get_command_class(self, command):
          """Pluggable version of get_command_class()"""
          if command in self.cmdclass:
              return self.cmdclass[command]
  
          for ep in pkg_resources.iter_entry_points('distutils.commands',command):
              ep.require(installer=self.fetch_build_egg)
              self.cmdclass[command] = cmdclass = ep.load()
              return cmdclass
          else:
              return _Distribution.get_command_class(self, command)
  
      def print_commands(self):
          for ep in pkg_resources.iter_entry_points('distutils.commands'):
              if ep.name not in self.cmdclass:
                  cmdclass = ep.load(False) # don't require extras, we're not running
                  self.cmdclass[ep.name] = cmdclass
          return _Distribution.print_commands(self)
  
  
  
  
  
      def _set_feature(self,name,status):
          """Set feature's inclusion status"""
          setattr(self,self._feature_attrname(name),status)
  
      def feature_is_included(self,name):
          """Return 1 if feature is included, 0 if excluded, 'None' if unknown"""
          return getattr(self,self._feature_attrname(name))
  
      def include_feature(self,name):
          """Request inclusion of feature named 'name'"""
  
          if self.feature_is_included(name)==0:
              descr = self.features[name].description
              raise DistutilsOptionError(
                 descr + " is required, but was excluded or is not available"
             )
          self.features[name].include_in(self)
          self._set_feature(name,1)
  
      def include(self,**attrs):
          """Add items to distribution that are named in keyword arguments
  
          For example, 'dist.exclude(py_modules=["x"])' would add 'x' to
          the distribution's 'py_modules' attribute, if it was not already
          there.
  
          Currently, this method only supports inclusion for attributes that are
          lists or tuples.  If you need to add support for adding to other
          attributes in this or a subclass, you can add an '_include_X' method,
          where 'X' is the name of the attribute.  The method will be called with
          the value passed to 'include()'.  So, 'dist.include(foo={"bar":"baz"})'
          will try to call 'dist._include_foo({"bar":"baz"})', which can then
          handle whatever special inclusion logic is needed.
          """
          for k,v in list(attrs.items()):
              include = getattr(self, '_include_'+k, None)
              if include:
                  include(v)
              else:
                  self._include_misc(k,v)
  
      def exclude_package(self,package):
          """Remove packages, modules, and extensions in named package"""
  
          pfx = package+'.'
          if self.packages:
              self.packages = [
                  p for p in self.packages
                      if p != package and not p.startswith(pfx)
              ]
  
          if self.py_modules:
              self.py_modules = [
                  p for p in self.py_modules
                      if p != package and not p.startswith(pfx)
              ]
  
          if self.ext_modules:
              self.ext_modules = [
                  p for p in self.ext_modules
                      if p.name != package and not p.name.startswith(pfx)
              ]
  
  
      def has_contents_for(self,package):
          """Return true if 'exclude_package(package)' would do something"""
  
          pfx = package+'.'
  
          for p in self.iter_distribution_names():
              if p==package or p.startswith(pfx):
                  return True
  
  
  
  
  
  
  
  
  
  
      def _exclude_misc(self,name,value):
          """Handle 'exclude()' for list/tuple attrs without a special handler"""
          if not isinstance(value,sequence):
              raise DistutilsSetupError(
                  "%s: setting must be a list or tuple (%r)" % (name, value)
              )
          try:
              old = getattr(self,name)
          except AttributeError:
              raise DistutilsSetupError(
                  "%s: No such distribution setting" % name
              )
          if old is not None and not isinstance(old,sequence):
              raise DistutilsSetupError(
                  name+": this setting cannot be changed via include/exclude"
              )
          elif old:
              setattr(self,name,[item for item in old if item not in value])
  
      def _include_misc(self,name,value):
          """Handle 'include()' for list/tuple attrs without a special handler"""
  
          if not isinstance(value,sequence):
              raise DistutilsSetupError(
                  "%s: setting must be a list (%r)" % (name, value)
              )
          try:
              old = getattr(self,name)
          except AttributeError:
              raise DistutilsSetupError(
                  "%s: No such distribution setting" % name
              )
          if old is None:
              setattr(self,name,value)
          elif not isinstance(old,sequence):
              raise DistutilsSetupError(
                  name+": this setting cannot be changed via include/exclude"
              )
          else:
              setattr(self,name,old+[item for item in value if item not in old])
  
      def exclude(self,**attrs):
          """Remove items from distribution that are named in keyword arguments
  
          For example, 'dist.exclude(py_modules=["x"])' would remove 'x' from
          the distribution's 'py_modules' attribute.  Excluding packages uses
          the 'exclude_package()' method, so all of the package's contained
          packages, modules, and extensions are also excluded.
  
          Currently, this method only supports exclusion from attributes that are
          lists or tuples.  If you need to add support for excluding from other
          attributes in this or a subclass, you can add an '_exclude_X' method,
          where 'X' is the name of the attribute.  The method will be called with
          the value passed to 'exclude()'.  So, 'dist.exclude(foo={"bar":"baz"})'
          will try to call 'dist._exclude_foo({"bar":"baz"})', which can then
          handle whatever special exclusion logic is needed.
          """
          for k,v in list(attrs.items()):
              exclude = getattr(self, '_exclude_'+k, None)
              if exclude:
                  exclude(v)
              else:
                  self._exclude_misc(k,v)
  
      def _exclude_packages(self,packages):
          if not isinstance(packages,sequence):
              raise DistutilsSetupError(
                  "packages: setting must be a list or tuple (%r)" % (packages,)
              )
          list(map(self.exclude_package, packages))
  
  
  
  
  
  
  
  
  
  
  
  
      def _parse_command_opts(self, parser, args):
          # Remove --with-X/--without-X options when processing command args
          self.global_options = self.__class__.global_options
          self.negative_opt = self.__class__.negative_opt
  
          # First, expand any aliases
          command = args[0]
          aliases = self.get_option_dict('aliases')
          while command in aliases:
              src,alias = aliases[command]
              del aliases[command]    # ensure each alias can expand only once!
              import shlex
              args[:1] = shlex.split(alias,True)
              command = args[0]
  
          nargs = _Distribution._parse_command_opts(self, parser, args)
  
          # Handle commands that want to consume all remaining arguments
          cmd_class = self.get_command_class(command)
          if getattr(cmd_class,'command_consumes_arguments',None):
              self.get_option_dict(command)['args'] = ("command line", nargs)
              if nargs is not None:
                  return []
  
          return nargs
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
      def get_cmdline_options(self):
          """Return a '{cmd: {opt:val}}' map of all command-line options
  
          Option names are all long, but do not include the leading '--', and
          contain dashes rather than underscores.  If the option doesn't take
          an argument (e.g. '--quiet'), the 'val' is 'None'.
  
          Note that options provided by config files are intentionally excluded.
          """
  
          d = {}
  
          for cmd,opts in list(self.command_options.items()):
  
              for opt,(src,val) in list(opts.items()):
  
                  if src != "command line":
                      continue
  
                  opt = opt.replace('_','-')
  
                  if val==0:
                      cmdobj = self.get_command_obj(cmd)
                      neg_opt = self.negative_opt.copy()
                      neg_opt.update(getattr(cmdobj,'negative_opt',{}))
                      for neg,pos in list(neg_opt.items()):
                          if pos==opt:
                              opt=neg
                              val=None
                              break
                      else:
                          raise AssertionError("Shouldn't be able to get here")
  
                  elif val==1:
                      val = None
  
                  d.setdefault(cmd,{})[opt] = val
  
          return d
  
  
      def iter_distribution_names(self):
          """Yield all packages, modules, and extension names in distribution"""
  
          for pkg in self.packages or ():
              yield pkg
  
          for module in self.py_modules or ():
              yield module
  
          for ext in self.ext_modules or ():
              if isinstance(ext,tuple):
                  name, buildinfo = ext
              else:
                  name = ext.name
              if name.endswith('module'):
                  name = name[:-6]
              yield name
  
  
      def handle_display_options(self, option_order):
          """If there were any non-global "display-only" options
          (--help-commands or the metadata display options) on the command
          line, display the requested info and return true; else return
          false.
          """
          import sys
  
          if sys.version_info < (3,) or self.help_commands:
              return _Distribution.handle_display_options(self, option_order)
  
          # Stdout may be StringIO (e.g. in tests)
          import io
          if not isinstance(sys.stdout, io.TextIOWrapper):
              return _Distribution.handle_display_options(self, option_order)
  
          # Don't wrap stdout if utf-8 is already the encoding. Provides
          #  workaround for #334.
          if sys.stdout.encoding.lower() in ('utf-8', 'utf8'):
              return _Distribution.handle_display_options(self, option_order)
  
          # Print metadata in UTF-8 no matter the platform
          encoding = sys.stdout.encoding
          errors = sys.stdout.errors
          newline = sys.platform != 'win32' and '\n' or None
          line_buffering = sys.stdout.line_buffering
  
          sys.stdout = io.TextIOWrapper(
              sys.stdout.detach(), 'utf-8', errors, newline, line_buffering)
          try:
              return _Distribution.handle_display_options(self, option_order)
          finally:
              sys.stdout = io.TextIOWrapper(
                  sys.stdout.detach(), encoding, errors, newline, line_buffering)
  
  
  # Install it throughout the distutils
  for module in distutils.dist, distutils.core, distutils.cmd:
      module.Distribution = Distribution
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  class Feature:
      """A subset of the distribution that can be excluded if unneeded/wanted
  
      Features are created using these keyword arguments:
  
        'description' -- a short, human readable description of the feature, to
           be used in error messages, and option help messages.
  
        'standard' -- if true, the feature is included by default if it is
           available on the current system.  Otherwise, the feature is only
           included if requested via a command line '--with-X' option, or if
           another included feature requires it.  The default setting is 'False'.
  
        'available' -- if true, the feature is available for installation on the
           current system.  The default setting is 'True'.
  
        'optional' -- if true, the feature's inclusion can be controlled from the
           command line, using the '--with-X' or '--without-X' options.  If
           false, the feature's inclusion status is determined automatically,
           based on 'availabile', 'standard', and whether any other feature
           requires it.  The default setting is 'True'.
  
        'require_features' -- a string or sequence of strings naming features
           that should also be included if this feature is included.  Defaults to
           empty list.  May also contain 'Require' objects that should be
           added/removed from the distribution.
  
        'remove' -- a string or list of strings naming packages to be removed
           from the distribution if this feature is *not* included.  If the
           feature *is* included, this argument is ignored.  This argument exists
           to support removing features that "crosscut" a distribution, such as
           defining a 'tests' feature that removes all the 'tests' subpackages
           provided by other features.  The default for this argument is an empty
           list.  (Note: the named package(s) or modules must exist in the base
           distribution when the 'setup()' function is initially called.)
  
        other keywords -- any other keyword arguments are saved, and passed to
           the distribution's 'include()' and 'exclude()' methods when the
           feature is included or excluded, respectively.  So, for example, you
           could pass 'packages=["a","b"]' to cause packages 'a' and 'b' to be
           added or removed from the distribution as appropriate.
  
      A feature must include at least one 'requires', 'remove', or other
      keyword argument.  Otherwise, it can't affect the distribution in any way.
      Note also that you can subclass 'Feature' to create your own specialized
      feature types that modify the distribution in other ways when included or
      excluded.  See the docstrings for the various methods here for more detail.
      Aside from the methods, the only feature attributes that distributions look
      at are 'description' and 'optional'.
      """
      def __init__(self, description, standard=False, available=True,
          optional=True, require_features=(), remove=(), **extras
      ):
  
          self.description = description
          self.standard = standard
          self.available = available
          self.optional = optional
          if isinstance(require_features,(str,Require)):
              require_features = require_features,
  
          self.require_features = [
              r for r in require_features if isinstance(r,str)
          ]
          er = [r for r in require_features if not isinstance(r,str)]
          if er: extras['require_features'] = er
  
          if isinstance(remove,str):
              remove = remove,
          self.remove = remove
          self.extras = extras
  
          if not remove and not require_features and not extras:
              raise DistutilsSetupError(
                  "Feature %s: must define 'require_features', 'remove', or at least one"
                  " of 'packages', 'py_modules', etc."
              )
  
      def include_by_default(self):
          """Should this feature be included by default?"""
          return self.available and self.standard
  
      def include_in(self,dist):
  
          """Ensure feature and its requirements are included in distribution
  
          You may override this in a subclass to perform additional operations on
          the distribution.  Note that this method may be called more than once
          per feature, and so should be idempotent.
  
          """
  
          if not self.available:
              raise DistutilsPlatformError(
                  self.description+" is required,"
                  "but is not available on this platform"
              )
  
          dist.include(**self.extras)
  
          for f in self.require_features:
              dist.include_feature(f)
  
  
  
      def exclude_from(self,dist):
  
          """Ensure feature is excluded from distribution
  
          You may override this in a subclass to perform additional operations on
          the distribution.  This method will be called at most once per
          feature, and only after all included features have been asked to
          include themselves.
          """
  
          dist.exclude(**self.extras)
  
          if self.remove:
              for item in self.remove:
                  dist.exclude_package(item)
  
  
  
      def validate(self,dist):
  
          """Verify that feature makes sense in context of distribution
  
          This method is called by the distribution just before it parses its
          command line.  It checks to ensure that the 'remove' attribute, if any,
          contains only valid package/module names that are present in the base
          distribution when 'setup()' is called.  You may override it in a
          subclass to perform any other required validation of the feature
          against a target distribution.
          """
  
          for item in self.remove:
              if not dist.has_contents_for(item):
                  raise DistutilsSetupError(
                      "%s wants to be able to remove %s, but the distribution"
                      " doesn't contain any packages or modules under %s"
                      % (self.description, item, item)
                  )
  
  
  
  def check_packages(dist, attr, value):
      for pkgname in value:
          if not re.match(r'\w+(\.\w+)*', pkgname):
              distutils.log.warn(
                  "WARNING: %r not a valid package name; please use only"
                  ".-separated package names in setup.py", pkgname
              )
  
  