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from distutils import version
import re
class FlexibleVersion(version.Version):
"""
A more flexible implementation of distutils.version.StrictVersion
The implementation allows to specify:
- an arbitrary number of version numbers:
not only '1.2.3' , but also '1.2.3.4.5'
- the separator between version numbers:
'1-2-3' is allowed when '-' is specified as separator
- a flexible pre-release separator:
'1.2.3.alpha1', '1.2.3-alpha1', and '1.2.3alpha1' are considered equivalent
- an arbitrary ordering of pre-release tags:
1.1alpha3 < 1.1beta2 < 1.1rc1 < 1.1
when ["alpha", "beta", "rc"] is specified as pre-release tag list
Inspiration from this discussion at StackOverflow:
http://stackoverflow.com/questions/12255554/sort-versions-in-python
"""
def __init__(self, vstring=None, sep='.', prerel_tags=('alpha', 'beta', 'rc')):
version.Version.__init__(self)
if sep is None:
sep = '.'
if prerel_tags is None:
prerel_tags = ()
self.sep = sep
self.prerel_sep = ''
self.prerel_tags = tuple(prerel_tags) if prerel_tags is not None else ()
self._compile_pattern()
self.prerelease = None
self.version = ()
if vstring:
self._parse(vstring)
return
_nn_version = 'version'
_nn_prerel_sep = 'prerel_sep'
_nn_prerel_tag = 'tag'
_nn_prerel_num = 'tag_num'
_re_prerel_sep = r'(?P<{pn}>{sep})?'.format(
pn=_nn_prerel_sep,
sep='|'.join(map(re.escape, ('.', '-'))))
@property
def major(self):
return self.version[0] if len(self.version) > 0 else 0
@property
def minor(self):
return self.version[1] if len(self.version) > 1 else 0
@property
def patch(self):
return self.version[2] if len(self.version) > 2 else 0
def _parse(self, vstring):
m = self.version_re.match(vstring)
if not m:
raise ValueError("Invalid version number '{0}'".format(vstring))
self.prerelease = None
self.version = ()
self.prerel_sep = m.group(self._nn_prerel_sep)
tag = m.group(self._nn_prerel_tag)
tag_num = m.group(self._nn_prerel_num)
if tag is not None and tag_num is not None:
self.prerelease = (tag, int(tag_num) if len(tag_num) else None)
self.version = tuple(map(int, self.sep_re.split(m.group(self._nn_version))))
return
def __add__(self, increment):
version = list(self.version)
version[-1] += increment
vstring = self._assemble(version, self.sep, self.prerel_sep, self.prerelease)
return FlexibleVersion(vstring=vstring, sep=self.sep, prerel_tags=self.prerel_tags)
def __sub__(self, decrement):
version = list(self.version)
if version[-1] <= 0:
raise ArithmeticError("Cannot decrement final numeric component of {0} below zero" \
.format(self))
version[-1] -= decrement
vstring = self._assemble(version, self.sep, self.prerel_sep, self.prerelease)
return FlexibleVersion(vstring=vstring, sep=self.sep, prerel_tags=self.prerel_tags)
def __repr__(self):
return "{cls} ('{vstring}', '{sep}', {prerel_tags})"\
.format(
cls=self.__class__.__name__,
vstring=str(self),
sep=self.sep,
prerel_tags=self.prerel_tags)
def __str__(self):
return self._assemble(self.version, self.sep, self.prerel_sep, self.prerelease)
def __ge__(self, that):
return not self.__lt__(that)
def __gt__(self, that):
return (not self.__lt__(that)) and (not self.__eq__(that))
def __le__(self, that):
return (self.__lt__(that)) or (self.__eq__(that))
def __lt__(self, that):
this_version, that_version = self._ensure_compatible(that)
if this_version != that_version \
or self.prerelease is None and that.prerelease is None:
return this_version < that_version
if self.prerelease is not None and that.prerelease is None:
return True
if self.prerelease is None and that.prerelease is not None:
return False
this_index = self.prerel_tags_set[self.prerelease[0]]
that_index = self.prerel_tags_set[that.prerelease[0]]
if this_index == that_index:
return self.prerelease[1] < that.prerelease[1]
return this_index < that_index
def __ne__(self, that):
return not self.__eq__(that)
def __eq__(self, that):
this_version, that_version = self._ensure_compatible(that)
if this_version != that_version:
return False
if self.prerelease != that.prerelease:
return False
return True
def _assemble(self, version, sep, prerel_sep, prerelease):
s = sep.join(map(str, version))
if prerelease is not None:
if prerel_sep is not None:
s += prerel_sep
s += prerelease[0]
if prerelease[1] is not None:
s += str(prerelease[1])
return s
def _compile_pattern(self):
sep, self.sep_re = self._compile_separator(self.sep)
if self.prerel_tags:
tags = '|'.join(re.escape(tag) for tag in self.prerel_tags)
self.prerel_tags_set = dict(zip(self.prerel_tags, range(len(self.prerel_tags))))
release_re = '(?:{prerel_sep}(?P<{tn}>{tags})(?P<{nn}>\d*))?'.format(
prerel_sep=self._re_prerel_sep,
tags=tags,
tn=self._nn_prerel_tag,
nn=self._nn_prerel_num)
else:
release_re = ''
version_re = r'^(?P<{vn}>\d+(?:(?:{sep}\d+)*)?){rel}$'.format(
vn=self._nn_version,
sep=sep,
rel=release_re)
self.version_re = re.compile(version_re)
return
def _compile_separator(self, sep):
if sep is None:
return '', re.compile('')
return re.escape(sep), re.compile(re.escape(sep))
def _ensure_compatible(self, that):
"""
Ensures the instances have the same structure and, if so, returns length compatible
version lists (so that x.y.0.0 is equivalent to x.y).
"""
if self.prerel_tags != that.prerel_tags or self.sep != that.sep:
raise ValueError("Unable to compare: versions have different structures")
this_version = list(self.version[:])
that_version = list(that.version[:])
while len(this_version) < len(that_version): this_version.append(0)
while len(that_version) < len(this_version): that_version.append(0)
return this_version, that_version
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