59 lines
1.6 KiB
Python
59 lines
1.6 KiB
Python
# Licensed under a 3-clause BSD style license - see LICENSE.rst
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"""
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Handle loading ply package from system or from the bundled copy
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"""
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import imp
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from distutils.version import StrictVersion
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def _find_module(name, path=None):
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"""
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Alternative to `imp.find_module` that can also search in subpackages.
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"""
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parts = name.split('.')
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for part in parts:
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if path is not None:
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path = [path]
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fh, path, descr = imp.find_module(part, path)
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return fh, path, descr
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_PLY_MIN_VERSION = StrictVersion('3.4')
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# Update this to prevent Astropy from using its bundled copy of ply
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# (but only if some other version of at least _PLY_MIN_VERSION can
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# be provided)
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_PLY_SEARCH_PATH = ['ply']
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for mod_name in _PLY_SEARCH_PATH:
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try:
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mod_info = _find_module(mod_name)
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#mod_lex_info = _find_module(mod_name + '.lex')
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except ImportError:
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continue
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mod = imp.load_module(__name__, *mod_info)
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#mod_lex = imp.load_module(__name__ + '.lex', *mod_lex_info)
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try:
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# if StrictVersion(mod_lex.__version__) >= _PLY_MIN_VERSION:
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# break
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break
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except (AttributeError, ValueError):
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# Attribute error if the ply module isn't what it should be and doesn't
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# have a .__version__; ValueError if the version string exists but is
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# somehow bogus/unparseable
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continue
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else:
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raise ImportError(
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"Astropy requires the 'ply' module of minimum version {0}; "
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"normally this is bundled with the astropy package so if you get "
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"this warning consult the packager of your Astropy "
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"distribution.".format(_PLY_MIN_VERSION))
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