import re import functools import distutils.core import distutils.errors import distutils.extension from .monkey import get_unpatched def _have_cython(): """ Return True if Cython can be imported. """ cython_impl = 'Cython.Distutils.build_ext' try: # from (cython_impl) import build_ext __import__(cython_impl, fromlist=['build_ext']).build_ext return True except Exception: pass return False # for compatibility have_pyrex = _have_cython _Extension = get_unpatched(distutils.core.Extension) class Extension(_Extension): """Extension that uses '.c' files in place of '.pyx' files""" def __init__(self, name, sources, *args, **kw): # The *args is needed for compatibility as calls may use positional # arguments. py_limited_api may be set only via keyword. self.py_limited_api = kw.pop("py_limited_api", False) _Extension.__init__(self, name, sources, *args, **kw) 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_cython(): # 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"""