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import re
class Version:
"""
This class is intended to provide utility methods to work with semver ranges.
Right now it is limited to the simplest case: a ">=" operator followed by an exact version with no prerelease or build specification.
Example: ">= 1.2.3"
"""
@classmethod
def from_str(cls, input):
"""
:param str input: save exact formatted version e.g. 1.2.3
:rtype: Version
:raises: ValueError
"""
parts = input.strip().split(".", 2)
major = int(parts[0])
minor = int(parts[1])
patch = int(parts[2])
return cls(major, minor, patch)
STABLE_VERSION_RE = re.compile(r'^\d+\.\d+\.\d+$')
@classmethod
def is_stable(cls, v):
"""
Verifies that the version is in a supported format.
:param v:string with the version
:return: bool
"""
return cls.STABLE_VERSION_RE.match(v) is not None
@classmethod
def cmp(cls, a, b):
"""
Compare two versions. Should be used with "cmp_to_key" wrapper in sorted(), min(), max()...
For example:
sorted(["1.2.3", "2.4.2", "1.2.7"], key=cmp_to_key(Version.cmp))
:param a:string with version or Version instance
:param b:string with version or Version instance
:return: int
:raises: ValueError
"""
a_version = a if isinstance(a, cls) else cls.from_str(a)
b_version = b if isinstance(b, cls) else cls.from_str(b)
if a_version > b_version:
return 1
elif a_version < b_version:
return -1
else:
return 0
__slots__ = ("_values")
def __init__(self, major, minor, patch):
"""
:param int major
:param int minor
:param int patch
:raises ValueError
"""
version_parts = {
"major": major,
"minor": minor,
"patch": patch,
}
for name, value in version_parts.items():
value = int(value)
version_parts[name] = value
if value < 0:
raise ValueError(
"{!r} is negative. A version can only be positive.".format(name)
)
self._values = (version_parts["major"], version_parts["minor"], version_parts["patch"])
def __str__(self):
return "{}.{}.{}".format(self._values[0], self._values[1], self._values[2])
def __repr__(self):
return '<Version({})>'.format(self)
def __eq__(self, other):
"""
:param Version other
:rtype: bool
"""
return self.as_tuple() == other.as_tuple()
def __ne__(self, other):
return self.as_tuple() != other.as_tuple()
def __gt__(self, other):
"""
:param Version other
:rtype: bool
"""
return self.as_tuple() > other.as_tuple()
def __ge__(self, other):
"""
:param Version other
:rtype: bool
"""
return self.as_tuple() >= other.as_tuple()
def __lt__(self, other):
"""
:param Version other
:rtype: bool
"""
return self.as_tuple() < other.as_tuple()
def __le__(self, other):
"""
:param Version other
:rtype: bool
"""
return self.as_tuple() <= other.as_tuple()
@property
def major(self):
"""The major part of the version (read-only)."""
return self._values[0]
@major.setter
def major(self, value):
raise AttributeError("Attribute 'major' is readonly")
@property
def minor(self):
"""The minor part of the version (read-only)."""
return self._values[1]
@minor.setter
def minor(self, value):
raise AttributeError("Attribute 'minor' is readonly")
@property
def patch(self):
"""The patch part of the version (read-only)."""
return self._values[2]
@patch.setter
def patch(self, value):
raise AttributeError("Attribute 'patch' is readonly")
def as_tuple(self):
"""
:rtype: tuple
"""
return self._values
class Operator:
EQ = "="
GT = ">"
GE = ">="
LT = "<"
LE = "<="
class VersionRange:
@classmethod
def from_str(cls, input):
"""
:param str input
:rtype: VersionRange
:raises: ValueError
"""
parts = input.strip().split(Operator.GE) # the only supported range operator at the moment
if len(parts) != 2 or parts[0] != "":
raise ValueError("Unsupported version range: '{}'. Currently we only support ranges formatted like so: '>= 1.2.3'".format(input))
version = Version.from_str(parts[1])
return cls(Operator.GE, version)
__slots__ = ("_operator", "_version")
def __init__(self, operator, version):
"""
:param str operator
:raises: ValueError
"""
if operator != Operator.GE:
raise ValueError("Unsupported range operator '{}'".format(operator))
self._operator = operator
self._version = version
@property
def operator(self):
"""The comparison operator to be used (read-only)."""
return self._operator
@operator.setter
def operator(self, value):
raise AttributeError("Attribute 'operator' is readonly")
@property
def version(self):
"""Version to be used with the operator (read-only)."""
return self._version
@version.setter
def version(self, value):
raise AttributeError("Attribute 'version' is readonly")
def is_satisfied_by(self, version):
"""
:param Version version
:rtype: bool
:raises: ValueError
"""
if self._operator != Operator.GE:
raise ValueError("Unsupported operator '{}'".format(self._operator))
return version >= self._version
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