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# -*- coding: utf-8 -*-
import re
_REGEX = re.compile('^(?P<major>[0-9]+)'
'\.(?P<minor>[0-9]+)'
'\.(?P<patch>[0-9]+)'
'(\-(?P<prerelease>[0-9A-Za-z]+(\.[0-9A-Za-z]+)*))?'
'(\+(?P<build>[0-9A-Za-z]+(\.[0-9A-Za-z]+)*))?$')
if 'cmp' not in __builtins__:
cmp = lambda a,b: (a > b) - (a < b)
def parse(version):
"""
Parse version to major, minor, patch, pre-release, build parts.
"""
match = _REGEX.match(version)
if match is None:
raise ValueError('%s is not valid SemVer string' % version)
verinfo = match.groupdict()
verinfo['major'] = int(verinfo['major'])
verinfo['minor'] = int(verinfo['minor'])
verinfo['patch'] = int(verinfo['patch'])
return verinfo
def compare(ver1, ver2):
def nat_cmp(a, b):
a, b = a or '', b or ''
convert = lambda text: text.isdigit() and int(text) or text.lower()
alphanum_key = lambda key: [convert(c) for c in re.split('([0-9]+)', key)]
return cmp(alphanum_key(a), alphanum_key(b))
def compare_by_keys(d1, d2):
for key in ['major', 'minor', 'patch']:
v = cmp(d1.get(key), d2.get(key))
if v:
return v
rc1, rc2 = d1.get('prerelease'), d2.get('prerelease')
build1, build2 = d1.get('build'), d2.get('build')
rccmp = nat_cmp(rc1, rc2)
buildcmp = nat_cmp(build1, build2)
if not (rc1 or rc2):
return buildcmp
elif not rc1:
return 1
elif not rc2:
return -1
return rccmp or buildcmp or 0
v1, v2 = parse(ver1), parse(ver2)
return compare_by_keys(v1, v2)
def match(version, match_expr):
prefix = match_expr[:2]
if prefix in ('>=', '<=', '=='):
match_version = match_expr[2:]
elif prefix and prefix[0] in ('>', '<', '='):
prefix = prefix[0]
match_version = match_expr[1:]
else:
raise ValueError("match_expr parameter should be in format <op><ver>, "
"where <op> is one of ['<', '>', '==', '<=', '>=']. "
"You provided: %r" % match_expr)
possibilities_dict = {
'>': (1,),
'<': (-1,),
'==': (0,),
'>=': (0, 1),
'<=': (-1, 0)
}
possibilities = possibilities_dict[prefix]
cmp_res = compare(version, match_version)
return cmp_res in possibilities
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