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import sys
import distutils.core
import distutils.extension
from setuptools.dist import _get_unpatched
_Extension = _get_unpatched(distutils.core.Extension)
def have_pyrex():
"""
Return True if Cython or Pyrex can be imported.
"""
pyrex_impls = 'Cython.Distutils.build_ext', 'Pyrex.Distutils.build_ext'
for pyrex_impl in pyrex_impls:
try:
# from (pyrex_impl) import build_ext
__import__(pyrex_impl, fromlist=['build_ext']).build_ext
return True
except Exception:
pass
return False
class Extension(_Extension):
"""Extension that uses '.c' files in place of '.pyx' files"""
def __init__(self, *args, **kw):
_Extension.__init__(self, *args, **kw)
if not have_pyrex():
self._convert_pyx_sources_to_c()
def _convert_pyx_sources_to_c(self):
"convert .pyx extensions to .c"
def pyx_to_c(source):
if source.endswith('.pyx'):
source = source[:-4] + '.c'
return source
self.sources = list(map(pyx_to_c, self.sources))
class Library(Extension):
"""Just like a regular Extension, but built as a library instead"""
distutils.core.Extension = Extension
distutils.extension.Extension = Extension
if 'distutils.command.build_ext' in sys.modules:
sys.modules['distutils.command.build_ext'].Extension = Extension