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| 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""" | |