104 lines
4.4 KiB
Python
104 lines
4.4 KiB
Python
# -*- coding: utf-8 -*-
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##############################################################################
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#
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# OpenERP, Open Source Management Solution
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# Copyright (C) 2004-2009 Tiny SPRL (<http://tiny.be>).
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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##############################################################################
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## this functions are taken from the setuptools package (version 0.6c8)
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## http://peak.telecommunity.com/DevCenter/PkgResources#parsing-utilities
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import re
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component_re = re.compile(r'(\d+ | [a-z]+ | \.| -)', re.VERBOSE)
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replace = {'pre':'c', 'preview':'c','-':'final-','_':'final-','rc':'c','dev':'@','saas':'','~':''}.get
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def _parse_version_parts(s):
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for part in component_re.split(s):
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part = replace(part,part)
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if not part or part=='.':
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continue
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if part[:1] in '0123456789':
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yield part.zfill(8) # pad for numeric comparison
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else:
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yield '*'+part
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yield '*final' # ensure that alpha/beta/candidate are before final
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def parse_version(s):
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"""Convert a version string to a chronologically-sortable key
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This is a rough cross between distutils' StrictVersion and LooseVersion;
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if you give it versions that would work with StrictVersion, then it behaves
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the same; otherwise it acts like a slightly-smarter LooseVersion. It is
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*possible* to create pathological version coding schemes that will fool
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this parser, but they should be very rare in practice.
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The returned value will be a tuple of strings. Numeric portions of the
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version are padded to 8 digits so they will compare numerically, but
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without relying on how numbers compare relative to strings. Dots are
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dropped, but dashes are retained. Trailing zeros between alpha segments
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or dashes are suppressed, so that e.g. "2.4.0" is considered the same as
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"2.4". Alphanumeric parts are lower-cased.
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The algorithm assumes that strings like "-" and any alpha string that
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alphabetically follows "final" represents a "patch level". So, "2.4-1"
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is assumed to be a branch or patch of "2.4", and therefore "2.4.1" is
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considered newer than "2.4-1", whic in turn is newer than "2.4".
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Strings like "a", "b", "c", "alpha", "beta", "candidate" and so on (that
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come before "final" alphabetically) are assumed to be pre-release versions,
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so that the version "2.4" is considered newer than "2.4a1".
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Finally, to handle miscellaneous cases, the strings "pre", "preview", and
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"rc" are treated as if they were "c", i.e. as though they were release
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candidates, and therefore are not as new as a version string that does not
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contain them.
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"""
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parts = []
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for part in _parse_version_parts((s or '0.1').lower()):
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if part.startswith('*'):
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if part<'*final': # remove '-' before a prerelease tag
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while parts and parts[-1]=='*final-': parts.pop()
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# remove trailing zeros from each series of numeric parts
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while parts and parts[-1]=='00000000':
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parts.pop()
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parts.append(part)
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return tuple(parts)
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if __name__ == '__main__':
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def cmp(a, b):
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msg = '%s < %s == %s' % (a, b, a < b)
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assert a < b, msg
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return b
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def chk(lst, verbose=False):
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pvs = []
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for v in lst:
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pv = parse_version(v)
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pvs.append(pv)
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if verbose:
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print v, pv
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reduce(cmp, pvs)
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chk(('0', '4.2', '4.2.3.4', '5.0.0-alpha', '5.0.0-rc1', '5.0.0-rc1.1', '5.0.0_rc2', '5.0.0_rc3', '5.0.0'), False)
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chk(('5.0.0-0_rc3', '5.0.0-1dev', '5.0.0-1'), False)
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# vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:
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