69 lines
1.9 KiB
Python
69 lines
1.9 KiB
Python
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# -*- coding: utf-8 -*-
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import re
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def parse(version):
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"""
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Parse version to major, minor, patch, pre-release, build parts.
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"""
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regex = re.compile(r"^([0-9]+)" # major
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+ r"\.([0-9]+)" # minor
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+ r"\.([0-9]+)" # patch
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+ r"(\-[0-9A-Za-z]+(\.[0-9A-Za-z]+)*)?" # pre-release
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+ r"(\+[0-9A-Za-z]+(\.[0-9A-Za-z]+)*)?$") # build
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match = regex.match(version)
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if match is None:
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raise ValueError('{0} is not valid SemVer string'.format(version))
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rv = {}
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rv['major'] = int(match.group(1))
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rv['minor'] = int(match.group(2))
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rv['patch'] = int(match.group(3))
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if match.group(4):
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rv['prerelease'] = match.group(4).lstrip('-')
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if match.group(6):
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rv['build'] = match.group(6).lstrip('+')
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return rv
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def compare(ver1, ver2):
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def compare_by_keys(d1, d2, keys):
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for key in keys:
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v = cmp(d1.get(key), d2.get(key))
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if v != 0:
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return v
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return 0
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v1, v2 = parse(ver1), parse(ver2)
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return compare_by_keys(
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v1, v2, ['major', 'minor', 'patch', 'prerelease', 'build'])
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def match(version, match_expr):
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prefix = match_expr[:2]
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if prefix in ('>=', '<=', '=='):
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match_version = match_expr[2:]
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elif prefix[0] in ('>', '<', '='):
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prefix = prefix[0]
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match_version = match_expr[1:]
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else:
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raise ValueError(u"match_expr parameter should be in format <op><ver>, "
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u"where <op> is one of ['<', '>', '==', '<=', '>=']. "
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u"You provided: {}".format(match_expr))
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possibilities_dict = {
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'>': (1,),
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'<': (-1,),
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'==': (0,),
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'>=': (0, 1),
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'<=': (-1, 0)}
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possibilities = possibilities_dict[prefix]
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cmp_res = compare(version, match_version)
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if cmp_res in possibilities:
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return True
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else:
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return False
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