text: #!/usr/bin/env python
  #
  # Copyright 2009 Facebook
  #
  # Licensed under the Apache License, Version 2.0 (the "License"); you may
  # not use this file except in compliance with the License. You may obtain
  # a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  # License for the specific language governing permissions and limitations
  # under the License.
  
  import os
  import platform
  import sys
  import warnings
  
  try:
      # Use setuptools if available, for install_requires (among other things).
      import setuptools
      from setuptools import setup
  except ImportError:
      setuptools = None
      from distutils.core import setup
  
  from distutils.core import Extension
  
  # The following code is copied from
  # https://github.com/mongodb/mongo-python-driver/blob/master/setup.py
  # to support installing without the extension on platforms where
  # no compiler is available.
  from distutils.command.build_ext import build_ext
  
  
  class custom_build_ext(build_ext):
      """Allow C extension building to fail.
  
      The C extension speeds up websocket masking, but is not essential.
      """
  
      warning_message = """
  ********************************************************************
  WARNING: %s could not
  be compiled. No C extensions are essential for Tornado to run,
  although they do result in significant speed improvements for
  websockets.
  %s
  
  Here are some hints for popular operating systems:
  
  If you are seeing this message on Linux you probably need to
  install GCC and/or the Python development package for your
  version of Python.
  
  Debian and Ubuntu users should issue the following command:
  
      $ sudo apt-get install build-essential python-dev
  
  RedHat, CentOS, and Fedora users should issue the following command:
  
      $ sudo yum install gcc python-devel
  
  If you are seeing this message on OSX please read the documentation
  here:
  
  http://api.mongodb.org/python/current/installation.html#osx
  ********************************************************************
  """
  
      def run(self):
          try:
              build_ext.run(self)
          except Exception:
              e = sys.exc_info()[1]
              sys.stdout.write('%s\n' % str(e))
              warnings.warn(self.warning_message % ("Extension modules",
                                                    "There was an issue with "
                                                    "your platform configuration"
                                                    " - see above."))
  
      def build_extension(self, ext):
          name = ext.name
          try:
              build_ext.build_extension(self, ext)
          except Exception:
              e = sys.exc_info()[1]
              sys.stdout.write('%s\n' % str(e))
              warnings.warn(self.warning_message % ("The %s extension "
                                                    "module" % (name,),
                                                    "The output above "
                                                    "this warning shows how "
                                                    "the compilation "
                                                    "failed."))
  
  
  kwargs = {}
  
  version = "4.3.dev1"
  
  with open('README.rst') as f:
      kwargs['long_description'] = f.read()
  
  if (platform.python_implementation() == 'CPython' and
          os.environ.get('TORNADO_EXTENSION') != '0'):
      # This extension builds and works on pypy as well, although pypy's jit
      # produces equivalent performance.
      kwargs['ext_modules'] = [
          Extension('tornado.speedups',
                    sources=['tornado/speedups.c']),
      ]
  
      if os.environ.get('TORNADO_EXTENSION') != '1':
          # Unless the user has specified that the extension is mandatory,
          # fall back to the pure-python implementation on any build failure.
          kwargs['cmdclass'] = {'build_ext': custom_build_ext}
  
  
  if setuptools is not None:
      # If setuptools is not available, you're on your own for dependencies.
      install_requires = []
      if sys.version_info < (3, 2):
          install_requires.append('backports.ssl_match_hostname')
      if sys.version_info < (3, 4):
          # Certifi is also optional on 2.7.9+, although making our dependencies
          # conditional on micro version numbers seems like a bad idea
          # until we have more declarative metadata.
          install_requires.append('certifi')
      kwargs['install_requires'] = install_requires
  
  setup(
      name="tornado",
      version=version,
      packages=["tornado", "tornado.test", "tornado.platform"],
      package_data={
          # data files need to be listed both here (which determines what gets
          # installed) and in MANIFEST.in (which determines what gets included
          # in the sdist tarball)
          "tornado.test": [
              "README",
              "csv_translations/fr_FR.csv",
              "gettext_translations/fr_FR/LC_MESSAGES/tornado_test.mo",
              "gettext_translations/fr_FR/LC_MESSAGES/tornado_test.po",
              "options_test.cfg",
              "static/robots.txt",
              "static/dir/index.html",
              "static_foo.txt",
              "templates/utf8.html",
              "test.crt",
              "test.key",
              ],
          },
      author="Facebook",
      author_email="python-tornado@googlegroups.com",
      url="http://www.tornadoweb.org/",
      license="http://www.apache.org/licenses/LICENSE-2.0",
      description="Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed.",
      classifiers=[
          'License :: OSI Approved :: Apache Software License',
          'Programming Language :: Python :: 2',
          'Programming Language :: Python :: 2.6',
          'Programming Language :: Python :: 2.7',
          'Programming Language :: Python :: 3',
          'Programming Language :: Python :: 3.2',
          'Programming Language :: Python :: 3.3',
          'Programming Language :: Python :: 3.4',
          'Programming Language :: Python :: Implementation :: CPython',
          'Programming Language :: Python :: Implementation :: PyPy',
          ],
      **kwargs
  )
  