/usr/lib/python2.7/dist-packages/semantic_version/base.py is in python-semantic-version 2.3.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright (c) 2012-2014 The python-semanticversion project
# This code is distributed under the two-clause BSD License.
from __future__ import unicode_literals
import functools
import re
from .compat import base_cmp
def _to_int(value):
try:
return int(value), True
except ValueError:
return value, False
def _has_leading_zero(value):
return (value
and value[0] == '0'
and value.isdigit()
and value != '0')
def identifier_cmp(a, b):
"""Compare two identifier (for pre-release/build components)."""
a_cmp, a_is_int = _to_int(a)
b_cmp, b_is_int = _to_int(b)
if a_is_int and b_is_int:
# Numeric identifiers are compared as integers
return base_cmp(a_cmp, b_cmp)
elif a_is_int:
# Numeric identifiers have lower precedence
return -1
elif b_is_int:
return 1
else:
# Non-numeric identifers are compared lexicographically
return base_cmp(a_cmp, b_cmp)
def identifier_list_cmp(a, b):
"""Compare two identifier list (pre-release/build components).
The rule is:
- Identifiers are paired between lists
- They are compared from left to right
- If all first identifiers match, the longest list is greater.
>>> identifier_list_cmp(['1', '2'], ['1', '2'])
0
>>> identifier_list_cmp(['1', '2a'], ['1', '2b'])
-1
>>> identifier_list_cmp(['1'], ['1', '2'])
-1
"""
identifier_pairs = zip(a, b)
for id_a, id_b in identifier_pairs:
cmp_res = identifier_cmp(id_a, id_b)
if cmp_res != 0:
return cmp_res
# alpha1.3 < alpha1.3.1
return base_cmp(len(a), len(b))
class Version(object):
version_re = re.compile('^(\d+)\.(\d+)\.(\d+)(?:-([0-9a-zA-Z.-]+))?(?:\+([0-9a-zA-Z.-]+))?$')
partial_version_re = re.compile('^(\d+)(?:\.(\d+)(?:\.(\d+))?)?(?:-([0-9a-zA-Z.-]*))?(?:\+([0-9a-zA-Z.-]*))?$')
def __init__(self, version_string, partial=False):
major, minor, patch, prerelease, build = self.parse(version_string, partial)
self.major = major
self.minor = minor
self.patch = patch
self.prerelease = prerelease
self.build = build
self.partial = partial
@classmethod
def _coerce(cls, value, allow_none=False):
if value is None and allow_none:
return value
return int(value)
@classmethod
def coerce(cls, version_string, partial=False):
"""Coerce an arbitrary version string into a semver-compatible one.
The rule is:
- If not enough components, fill minor/patch with zeroes; unless
partial=True
- If more than 3 dot-separated components, extra components are "build"
data. If some "build" data already appeared, append it to the
extra components
Examples:
>>> Version.coerce('0.1')
Version(0, 1, 0)
>>> Version.coerce('0.1.2.3')
Version(0, 1, 2, (), ('3',))
>>> Version.coerce('0.1.2.3+4')
Version(0, 1, 2, (), ('3', '4'))
>>> Version.coerce('0.1+2-3+4_5')
Version(0, 1, 0, (), ('2-3', '4-5'))
"""
base_re = re.compile(r'^\d+(?:\.\d+(?:\.\d+)?)?')
match = base_re.match(version_string)
if not match:
raise ValueError("Version string lacks a numerical component: %r"
% version_string)
version = version_string[:match.end()]
if not partial:
# We need a not-partial version.
while version.count('.') < 2:
version += '.0'
if match.end() == len(version_string):
return Version(version, partial=partial)
rest = version_string[match.end():]
# Cleanup the 'rest'
rest = re.sub(r'[^a-zA-Z0-9+.-]', '-', rest)
if rest[0] == '+':
# A 'build' component
prerelease = ''
build = rest[1:]
elif rest[0] == '.':
# An extra version component, probably 'build'
prerelease = ''
build = rest[1:]
elif rest[0] == '-':
rest = rest[1:]
if '+' in rest:
prerelease, build = rest.split('+', 1)
else:
prerelease, build = rest, ''
elif '+' in rest:
prerelease, build = rest.split('+', 1)
else:
prerelease, build = rest, ''
build = build.replace('+', '.')
if prerelease:
version = '%s-%s' % (version, prerelease)
if build:
version = '%s+%s' % (version, build)
return cls(version, partial=partial)
@classmethod
def parse(cls, version_string, partial=False, coerce=False):
"""Parse a version string into a Version() object.
Args:
version_string (str), the version string to parse
partial (bool), whether to accept incomplete input
coerce (bool), whether to try to map the passed in string into a
valid Version.
"""
if not version_string:
raise ValueError('Invalid empty version string: %r' % version_string)
if partial:
version_re = cls.partial_version_re
else:
version_re = cls.version_re
match = version_re.match(version_string)
if not match:
raise ValueError('Invalid version string: %r' % version_string)
major, minor, patch, prerelease, build = match.groups()
if _has_leading_zero(major):
raise ValueError("Invalid leading zero in major: %r" % version_string)
if _has_leading_zero(minor):
raise ValueError("Invalid leading zero in minor: %r" % version_string)
if _has_leading_zero(patch):
raise ValueError("Invalid leading zero in patch: %r" % version_string)
major = int(major)
minor = cls._coerce(minor, partial)
patch = cls._coerce(patch, partial)
if prerelease is None:
if partial and (build is None):
# No build info, strip here
return (major, minor, patch, None, None)
else:
prerelease = ()
elif prerelease == '':
prerelease = ()
else:
prerelease = tuple(prerelease.split('.'))
cls._validate_identifiers(prerelease, allow_leading_zeroes=False)
if build is None:
if partial:
build = None
else:
build = ()
elif build == '':
build = ()
else:
build = tuple(build.split('.'))
cls._validate_identifiers(build, allow_leading_zeroes=True)
return (major, minor, patch, prerelease, build)
@classmethod
def _validate_identifiers(cls, identifiers, allow_leading_zeroes=False):
for item in identifiers:
if not item:
raise ValueError("Invalid empty identifier %r in %r"
% (item, '.'.join(identifiers)))
if item[0] == '0' and item.isdigit() and item != '0' and not allow_leading_zeroes:
raise ValueError("Invalid leading zero in identifier %r" % item)
def __iter__(self):
return iter((self.major, self.minor, self.patch, self.prerelease, self.build))
def __str__(self):
version = '%d' % self.major
if self.minor is not None:
version = '%s.%d' % (version, self.minor)
if self.patch is not None:
version = '%s.%d' % (version, self.patch)
if self.prerelease or (self.partial and self.prerelease == () and self.build is None):
version = '%s-%s' % (version, '.'.join(self.prerelease))
if self.build or (self.partial and self.build == ()):
version = '%s+%s' % (version, '.'.join(self.build))
return version
def __repr__(self):
return 'Version(%r%s)' % (
str(self),
', partial=True' if self.partial else '',
)
@classmethod
def _comparison_functions(cls, partial=False):
"""Retrieve comparison methods to apply on version components.
This is a private API.
Args:
partial (bool): whether to provide 'partial' or 'strict' matching.
Returns:
5-tuple of cmp-like functions.
"""
def prerelease_cmp(a, b):
"""Compare prerelease components.
Special rule: a version without prerelease component has higher
precedence than one with a prerelease component.
"""
if a and b:
return identifier_list_cmp(a, b)
elif a:
# Versions with prerelease field have lower precedence
return -1
elif b:
return 1
else:
return 0
def build_cmp(a, b):
"""Compare build components.
Special rule: a version without build component has lower
precedence than one with a build component.
"""
if a and b:
return identifier_list_cmp(a, b)
elif a:
# Versions with build field have higher precedence
return 1
elif b:
return -1
else:
return 0
def make_optional(orig_cmp_fun):
"""Convert a cmp-like function to consider 'None == *'."""
@functools.wraps(orig_cmp_fun)
def alt_cmp_fun(a, b):
if a is None or b is None:
return 0
return orig_cmp_fun(a, b)
return alt_cmp_fun
if partial:
return [
base_cmp, # Major is still mandatory
make_optional(base_cmp),
make_optional(base_cmp),
make_optional(prerelease_cmp),
make_optional(build_cmp),
]
else:
return [
base_cmp,
base_cmp,
base_cmp,
prerelease_cmp,
build_cmp,
]
def __cmp__(self, other):
if not isinstance(other, self.__class__):
return NotImplemented
field_pairs = zip(self, other)
comparison_functions = self._comparison_functions(partial=self.partial or other.partial)
comparisons = zip(comparison_functions, self, other)
for cmp_fun, self_field, other_field in comparisons:
cmp_res = cmp_fun(self_field, other_field)
if cmp_res != 0:
return cmp_res
return 0
def __eq__(self, other):
if not isinstance(other, self.__class__):
return NotImplemented
return self.__cmp__(other) == 0
def __hash__(self):
return hash((self.major, self.minor, self.patch, self.prerelease, self.build))
def __ne__(self, other):
if not isinstance(other, self.__class__):
return NotImplemented
return self.__cmp__(other) != 0
def __lt__(self, other):
if not isinstance(other, self.__class__):
return NotImplemented
return self.__cmp__(other) < 0
def __le__(self, other):
if not isinstance(other, self.__class__):
return NotImplemented
return self.__cmp__(other) <= 0
def __gt__(self, other):
if not isinstance(other, self.__class__):
return NotImplemented
return self.__cmp__(other) > 0
def __ge__(self, other):
if not isinstance(other, self.__class__):
return NotImplemented
return self.__cmp__(other) >= 0
class SpecItem(object):
"""A requirement specification."""
KIND_ANY = '*'
KIND_LT = '<'
KIND_LTE = '<='
KIND_EQUAL = '=='
KIND_GTE = '>='
KIND_GT = '>'
KIND_NEQ = '!='
re_spec = re.compile(r'^(<|<=|==|>=|>|!=)(\d.*)$')
def __init__(self, requirement_string):
kind, spec = self.parse(requirement_string)
self.kind = kind
self.spec = spec
@classmethod
def parse(cls, requirement_string):
if not requirement_string:
raise ValueError("Invalid empty requirement specification: %r" % requirement_string)
# Special case: the 'any' version spec.
if requirement_string == '*':
return (cls.KIND_ANY, '')
match = cls.re_spec.match(requirement_string)
if not match:
raise ValueError("Invalid requirement specification: %r" % requirement_string)
kind, version = match.groups()
spec = Version(version, partial=True)
return (kind, spec)
def match(self, version):
if self.kind == self.KIND_ANY:
return True
elif self.kind == self.KIND_LT:
return version < self.spec
elif self.kind == self.KIND_LTE:
return version <= self.spec
elif self.kind == self.KIND_EQUAL:
return version == self.spec
elif self.kind == self.KIND_GTE:
return version >= self.spec
elif self.kind == self.KIND_GT:
return version > self.spec
elif self.kind == self.KIND_NEQ:
return version != self.spec
else: # pragma: no cover
raise ValueError('Unexpected match kind: %r' % self.kind)
def __str__(self):
return '%s%s' % (self.kind, self.spec)
def __repr__(self):
return '<SpecItem: %s %r>' % (self.kind, self.spec)
def __eq__(self, other):
if not isinstance(other, SpecItem):
return NotImplemented
return self.kind == other.kind and self.spec == other.spec
def __hash__(self):
return hash((self.kind, self.spec))
class Spec(object):
def __init__(self, *specs_strings):
subspecs = [self.parse(spec) for spec in specs_strings]
self.specs = sum(subspecs, ())
@classmethod
def parse(self, specs_string):
spec_texts = specs_string.split(',')
return tuple(SpecItem(spec_text) for spec_text in spec_texts)
def match(self, version):
"""Check whether a Version satisfies the Spec."""
return all(spec.match(version) for spec in self.specs)
def filter(self, versions):
"""Filter an iterable of versions satisfying the Spec."""
for version in versions:
if self.match(version):
yield version
def select(self, versions):
"""Select the best compatible version among an iterable of options."""
options = list(self.filter(versions))
if options:
return max(options)
return None
def __contains__(self, version):
if isinstance(version, Version):
return self.match(version)
return False
def __iter__(self):
return iter(self.specs)
def __str__(self):
return ','.join(str(spec) for spec in self.specs)
def __repr__(self):
return '<Spec: %r>' % (self.specs,)
def __eq__(self, other):
if not isinstance(other, Spec):
return NotImplemented
return set(self.specs) == set(other.specs)
def __hash__(self):
return hash(self.specs)
def compare(v1, v2):
return base_cmp(Version(v1), Version(v2))
def match(spec, version):
return Spec(spec).match(Version(version))
def validate(version_string):
"""Validates a version string againt the SemVer specification."""
try:
Version.parse(version_string)
return True
except ValueError:
return False
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