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- import sys
- import re
- import functools
- 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)
- self._convert_pyx_sources_to_lang()
- def _convert_pyx_sources_to_lang(self):
- """
- Replace sources with .pyx extensions to sources with the target
- language extension. This mechanism allows language authors to supply
- pre-converted sources but to prefer the .pyx sources.
- """
- if have_pyrex():
- # the build has Cython, so allow it to compile the .pyx files
- return
- lang = self.language or ''
- target_ext = '.cpp' if lang.lower() == 'c++' else '.c'
- sub = functools.partial(re.sub, '.pyx$', target_ext)
- self.sources = list(map(sub, 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
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