320 lines
8.7 KiB
Python
320 lines
8.7 KiB
Python
"""
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Python helper for Semantic Versioning (http://semver.org/)
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"""
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import collections
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import re
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import sys
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__version__ = '2.7.5'
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__author__ = 'Kostiantyn Rybnikov'
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__author_email__ = 'k-bx@k-bx.com'
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_REGEX = re.compile(
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r"""
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^
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(?P<major>(?:0|[1-9][0-9]*))
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\.
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(?P<minor>(?:0|[1-9][0-9]*))
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\.
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(?P<patch>(?:0|[1-9][0-9]*))
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(\-(?P<prerelease>
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(?:0|[1-9A-Za-z-][0-9A-Za-z-]*)
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(\.(?:0|[1-9A-Za-z-][0-9A-Za-z-]*))*
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))?
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(\+(?P<build>
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[0-9A-Za-z-]+
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(\.[0-9A-Za-z-]+)*
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))?
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$
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""", re.VERBOSE)
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_LAST_NUMBER = re.compile(r'(?:[^\d]*(\d+)[^\d]*)+')
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if not hasattr(__builtins__, 'cmp'):
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def cmp(a, b):
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return (a > b) - (a < b)
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def parse(version):
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"""Parse version to major, minor, patch, pre-release, build parts.
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:param version: version string
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:return: dictionary with the keys 'build', 'major', 'minor', 'patch',
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and 'prerelease'. The prerelease or build keys can be None
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if not provided
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:rtype: dict
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"""
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match = _REGEX.match(version)
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if match is None:
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raise ValueError('%s is not valid SemVer string' % version)
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version_parts = match.groupdict()
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version_parts['major'] = int(version_parts['major'])
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version_parts['minor'] = int(version_parts['minor'])
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version_parts['patch'] = int(version_parts['patch'])
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return version_parts
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VersionInfo = collections.namedtuple(
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'VersionInfo', 'major minor patch prerelease build')
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# Only change it for Python > 3 as it is readonly
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# for version 2
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if sys.version_info >= (3, 5):
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VersionInfo.__doc__ = """
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:param int major: version when you make incompatible API changes.
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:param int minor: version when you add functionality in
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a backwards-compatible manner.
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:param int patch: version when you make backwards-compatible bug fixes.
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:param str prerelease: an optional prerelease string
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:param str build: an optional build string
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>>> import semver
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>>> ver = semver.parse('3.4.5-pre.2+build.4')
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>>> ver
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{'build': 'build.4', 'major': 3, 'minor': 4, 'patch': 5,
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'prerelease': 'pre.2'}
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"""
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def parse_version_info(version):
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"""Parse version string to a VersionInfo instance.
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:param version: version string
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:return: a :class:`VersionInfo` instance
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:rtype: :class:`VersionInfo`
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"""
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parts = parse(version)
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version_info = VersionInfo(
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parts['major'], parts['minor'], parts['patch'],
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parts['prerelease'], parts['build'])
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return version_info
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def compare(ver1, ver2):
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"""Compare two versions
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:param ver1: version string 1
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:param ver2: version string 2
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:return: The return value is negative if ver1 < ver2,
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zero if ver1 == ver2 and strictly positive if ver1 > ver2
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:rtype: int
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"""
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def nat_cmp(a, b):
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def convert(text):
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return int(text) if re.match('[0-9]+', text) else text
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def split_key(key):
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return [convert(c) for c in key.split('.')]
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def cmp_prerelease_tag(a, b):
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if isinstance(a, int) and isinstance(b, int):
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return cmp(a, b)
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elif isinstance(a, int):
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return -1
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elif isinstance(b, int):
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return 1
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else:
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return cmp(a, b)
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a, b = a or '', b or ''
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a_parts, b_parts = split_key(a), split_key(b)
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for sub_a, sub_b in zip(a_parts, b_parts):
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cmp_result = cmp_prerelease_tag(sub_a, sub_b)
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if cmp_result != 0:
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return cmp_result
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else:
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return cmp(len(a), len(b))
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def compare_by_keys(d1, d2):
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for key in ['major', 'minor', 'patch']:
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v = cmp(d1.get(key), d2.get(key))
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if v:
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return v
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rc1, rc2 = d1.get('prerelease'), d2.get('prerelease')
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rccmp = nat_cmp(rc1, rc2)
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if not rccmp:
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return 0
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if not rc1:
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return 1
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elif not rc2:
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return -1
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return rccmp
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v1, v2 = parse(ver1), parse(ver2)
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return compare_by_keys(v1, v2)
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def match(version, match_expr):
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"""Compare two versions through a comparison
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:param str version: a version string
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:param str match_expr: operator and version; valid operators are
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< smaller than
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> greater than
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>= greator or equal than
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<= smaller or equal than
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== equal
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!= not equal
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:return: True if the expression matches the version, otherwise False
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:rtype: bool
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"""
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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 and 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("match_expr parameter should be in format <op><ver>, "
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"where <op> is one of "
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"['<', '>', '==', '<=', '>=', '!=']. "
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"You provided: %r" % 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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'!=': (-1, 1),
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'>=': (0, 1),
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'<=': (-1, 0)
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}
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possibilities = possibilities_dict[prefix]
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cmp_res = compare(version, match_version)
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return cmp_res in possibilities
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def max_ver(ver1, ver2):
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"""Returns the greater version of two versions
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:param ver1: version string 1
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:param ver2: version string 2
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:return: the greater version of the two
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:rtype: :class:`VersionInfo`
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"""
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cmp_res = compare(ver1, ver2)
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if cmp_res == 0 or cmp_res == 1:
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return ver1
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else:
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return ver2
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def min_ver(ver1, ver2):
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"""Returns the smaller version of two versions
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:param ver1: version string 1
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:param ver2: version string 2
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:return: the smaller version of the two
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:rtype: :class:`VersionInfo`
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"""
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cmp_res = compare(ver1, ver2)
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if cmp_res == 0 or cmp_res == -1:
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return ver1
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else:
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return ver2
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def format_version(major, minor, patch, prerelease=None, build=None):
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"""Format a version according to the Semantic Versioning specification
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:param str major: the required major part of a version
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:param str minor: the required minor part of a version
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:param str patch: the required patch part of a version
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:param str prerelease: the optional prerelease part of a version
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:param str build: the optional build part of a version
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:return: the formatted string
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:rtype: str
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"""
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version = "%d.%d.%d" % (major, minor, patch)
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if prerelease is not None:
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version = version + "-%s" % prerelease
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if build is not None:
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version = version + "+%s" % build
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return version
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def _increment_string(string):
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"""
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Look for the last sequence of number(s) in a string and increment, from:
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http://code.activestate.com/recipes/442460-increment-numbers-in-a-string/#c1
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"""
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match = _LAST_NUMBER.search(string)
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if match:
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next_ = str(int(match.group(1)) + 1)
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start, end = match.span(1)
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string = string[:max(end - len(next_), start)] + next_ + string[end:]
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return string
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def bump_major(version):
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"""Raise the major part of the version
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:param: version string
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:return: the raised version string
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:rtype: str
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"""
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verinfo = parse(version)
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return format_version(verinfo['major'] + 1, 0, 0)
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def bump_minor(version):
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"""Raise the minor part of the version
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:param: version string
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:return: the raised version string
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:rtype: str
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"""
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verinfo = parse(version)
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return format_version(verinfo['major'], verinfo['minor'] + 1, 0)
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def bump_patch(version):
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"""Raise the patch part of the version
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:param: version string
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:return: the raised version string
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:rtype: str
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"""
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verinfo = parse(version)
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return format_version(verinfo['major'], verinfo['minor'],
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verinfo['patch'] + 1)
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def bump_prerelease(version):
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"""Raise the prerelease part of the version
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:param: version string
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:return: the raised version string
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:rtype: str
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"""
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verinfo = parse(version)
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verinfo['prerelease'] = _increment_string(verinfo['prerelease'] or 'rc.0')
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return format_version(verinfo['major'], verinfo['minor'], verinfo['patch'],
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verinfo['prerelease'])
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def bump_build(version):
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"""Raise the build part of the version
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:param: version string
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:return: the raised version string
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:rtype: str
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"""
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verinfo = parse(version)
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verinfo['build'] = _increment_string(verinfo['build'] or 'build.0')
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return format_version(verinfo['major'], verinfo['minor'], verinfo['patch'],
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verinfo['prerelease'], verinfo['build'])
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