87 lines
3.0 KiB
Python
87 lines
3.0 KiB
Python
import sys
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import os
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from distutils.version import LooseVersion
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from multiprocessing import cpu_count
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CYTHON_VERSION = '0.23.4'
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# WindowsError is not defined on unix systems
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try:
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WindowsError
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except NameError:
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class WindowsError(Exception):
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pass
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def _compiled_filename(f):
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"""Check for the presence of a .pyx[.in] file as a .c or .cpp."""
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basename = f.replace('.in', '').replace('.pyx', '')
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for ext in ('.c', '.cpp'):
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filename = basename + ext
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if os.path.exists(filename):
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return filename
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else:
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raise RuntimeError('Cython >= %s is required to build '
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'scikit-image from git checkout' %
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CYTHON_VERSION)
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def cython(pyx_files, working_path=''):
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"""Use Cython to convert the given files to C.
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Parameters
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----------
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pyx_files : list of str
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The input .pyx files.
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"""
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# Do not build cython files if target is clean
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if len(sys.argv) >= 2 and sys.argv[1] == 'clean':
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return
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try:
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from Cython import __version__
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if LooseVersion(__version__) < CYTHON_VERSION:
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raise RuntimeError('Cython >= %s needed to build scikit-image' % CYTHON_VERSION)
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from Cython.Build import cythonize
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except ImportError:
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# If cython is not found, the build will make use of
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# the distributed .c or .cpp files if present
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c_files_used = [_compiled_filename(os.path.join(working_path, f))
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for f in pyx_files]
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print("Cython >= %s not found; falling back to pre-built %s" \
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% (CYTHON_VERSION, " ".join(c_files_used)))
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else:
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pyx_files = [os.path.join(working_path, f) for f in pyx_files]
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for i, pyxfile in enumerate(pyx_files):
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if pyxfile.endswith('.pyx.in'):
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process_tempita_pyx(pyxfile)
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pyx_files[i] = pyxfile.replace('.pyx.in', '.pyx')
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# Cython doesn't automatically choose a number of threads > 1
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# https://github.com/cython/cython/blob/a0bbb940c847dfe92cac446c8784c34c28c92836/Cython/Build/Dependencies.py#L923-L925
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cythonize(pyx_files, nthreads=cpu_count(),
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compiler_directives={'language_level': 3})
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def process_tempita_pyx(fromfile):
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try:
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try:
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from Cython import Tempita as tempita
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except ImportError:
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import tempita
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except ImportError:
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raise Exception('Building requires Tempita: '
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'pip install --user Tempita')
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template = tempita.Template.from_filename(fromfile,
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encoding=sys.getdefaultencoding())
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pyxcontent = template.substitute()
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if not fromfile.endswith('.pyx.in'):
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raise ValueError("Unexpected extension of %s." % fromfile)
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pyxfile = os.path.splitext(fromfile)[0] # split off the .in ending
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with open(pyxfile, "w") as f:
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f.write(pyxcontent)
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