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# encoding: utf-8
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"""
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Utilities for version comparison
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It is a bit ridiculous that we need these.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2013 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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from distutils.version import LooseVersion
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#-----------------------------------------------------------------------------
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# Code
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#-----------------------------------------------------------------------------
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class NumericalVersion(LooseVersion):
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"""A version of LooseVersion that is *always* comparable
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String elements (of any kind!) are interpreted as infinite.
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Since these are generally only on development branches,
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that is fairly safe, even though technically 1.0a1 should be less than 1.0.
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"""
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def parse (self, vstring):
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# I've given up on thinking I can reconstruct the version string
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# from the parsed tuple -- so I just store the string here for
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# use by __str__
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self.vstring = vstring
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components = filter(lambda x: x and x != '.',
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self.component_re.split(vstring))
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for i in range(len(components)):
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try:
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components[i] = int(components[i])
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except ValueError:
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# this is the only change
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components[i] = float('inf')
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self.version = components
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def version_tuple(vs):
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"""Return a tuple of numbers from a version string.
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'dev' 'a', 'etc' are transformed to float('inf'),
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so they will always compare positively to any
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regular integer element.
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"""
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return tuple(NumericalVersion(vs).version)
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#
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def check_version(v, check):
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"""check version string v >= check
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If dev/prerelease tags result in TypeError for string-number comparison,
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it is assumed that the dependency is satisfied.
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Users on dev branches are responsible for keeping their own packages up to date.
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"""
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try:
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return LooseVersion(v) >= LooseVersion(check)
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except TypeError:
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return True
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