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159 lines
4.7 KiB
Python
159 lines
4.7 KiB
Python
# Copyright (C) 2010, OLPC
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library 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 GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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# Boston, MA 02111-1307, USA.
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#
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# Based on the implementation of PEP 386, but adapted to our
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# numeration schema.
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#
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import re
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class InvalidVersionError(Exception):
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"""The passed activity version can not be normalized."""
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pass
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VERSION_RE = re.compile(r'''
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^
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(?P<version>\d+) # minimum 'N'
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(?P<extraversion>(?:\.\d+)*) # any number of extra '.N' segments
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(?:
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(?P<local>[\-\~].[a-zA-Z]*) # ignore any string in the comparison
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)?
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$''', re.VERBOSE)
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class NormalizedVersion(object):
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"""A normalized version.
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Good:
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1
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1.2
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1.2.3
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1.2.3-peru
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1.2.3~dfsg
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Bad:
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1.2peru # must be separated with -
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1.2. # can't end with '.'
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1.02.5 # can't have a leading zero
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"""
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def __init__(self, activity_version):
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"""Create a NormalizedVersion instance from a version string.
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Keyword arguments:
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activity_version -- The version string
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"""
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self._activity_version = activity_version
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self.parts = []
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self._local = None
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if not isinstance(self._activity_version, str):
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raise InvalidVersionError(self._activity_version)
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match = VERSION_RE.search(self._activity_version)
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if not match:
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raise InvalidVersionError(self._activity_version)
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groups = match.groupdict()
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version = self._parse_version(groups['version'])
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self.parts.append(version)
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if groups['extraversion'] not in ('', None):
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versions = self._parse_extraversions(groups['extraversion'][1:])
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self.parts.extend(versions)
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self._local = groups['local']
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def _parse_version(self, version_string):
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"""Verify that there is no leading zero and convert to integer.
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Keyword arguments:
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version -- string to be parsed
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Return: Version
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"""
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if len(version_string) > 1 and version_string[0] == '0':
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raise InvalidVersionError("Can not have leading zero in segment"
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" %s in %r" %
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(version_string, self._activity_version))
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return int(version_string)
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def _parse_extraversions(self, extraversion_string):
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"""Split into N versions and convert them to integers, verify
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that there are no leading zeros and drop trailing zeros.
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Keyword arguments:
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extraversion -- 'N.N.N...' sequence to be parsed
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Return: List of extra versions
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"""
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nums = []
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for n in extraversion_string.split("."):
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if len(n) > 1 and n[0] == '0':
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raise InvalidVersionError("Can not have leading zero in "
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"segment %s in %r"
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% (n, self._activity_version))
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nums.append(int(n))
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while nums and nums[-1] == 0:
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nums.pop()
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return nums
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def __str__(self):
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version_string = '.'.join(str(v) for v in self.parts)
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if self._local is not None:
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version_string += self._local
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return version_string
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def __repr__(self):
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return "%s('%s')" % (self.__class__.__name__, self)
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def _cannot_compare(self, other):
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raise TypeError("Can not compare %s and %s"
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% (type(self).__name__, type(other).__name__))
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def __eq__(self, other):
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if not isinstance(other, NormalizedVersion):
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self._cannot_compare(other)
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return self.parts == other.parts
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def __lt__(self, other):
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if not isinstance(other, NormalizedVersion):
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self._cannot_compare(other)
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return self.parts < other.parts
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def __ne__(self, other):
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return not self.__eq__(other)
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def __gt__(self, other):
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return not (self.__lt__(other) or self.__eq__(other))
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def __le__(self, other):
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return self.__eq__(other) or self.__lt__(other)
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def __ge__(self, other):
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return self.__eq__(other) or self.__gt__(other)
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