Tools/Scripts/webkitpy/common/version.py

# Copyright (C) 2017 Apple Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1.  Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer.
# 2.  Redistributions in binary form must reproduce the above copyright
#     notice, this list of conditions and the following disclaimer in the
#     documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR
# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import collections


class Version(object):

    @staticmethod
    def from_string(string):
        assert isinstance(string, str) or isinstance(string, unicode)
        return Version.from_iterable(string.split('.'))

    @staticmethod
    def from_iterable(val):
        result = Version()
        for i in xrange(len(val)):
            result[i] = int(val[i])
        return result

    @staticmethod
    def from_name(name):
        from version_name_map import VersionNameMap
        return VersionNameMap.map().from_name(name)[1]

    def __init__(self, major=0, minor=0, tiny=0, micro=0, nano=0):
        self.major = int(major)
        self.minor = int(minor)
        self.tiny = int(tiny)
        self.micro = int(micro)
        self.nano = int(nano)

    def __len__(self):
        return 5

    def __getitem__(self, key):
        if isinstance(key, int):
            if key == 0:
                return self.major
            elif key == 1:
                return self.minor
            elif key == 2:
                return self.tiny
            elif key == 3:
                return self.micro
            elif key == 4:
                return self.nano
            raise ValueError('Version key must be between 0 and 4')
        elif isinstance(key, str):
            if hasattr(self, key):
                return getattr(self, key)
            raise ValueError('Version key must be major, minor, tiny, micro or nano')
        raise ValueError('Expected version key to be string or integer')

    def __setitem__(self, key, value):
        if isinstance(key, int):
            if key == 0:
                self.major = int(value)
                return self.major
            elif key == 1:
                self.minor = int(value)
                return self.minor
            elif key == 2:
                self.tiny = int(value)
                return self.tiny
            elif key == 3:
                self.micro = int(value)
                return self.micro
            elif key == 4:
                self.nano = int(value)
                return self.nano
            raise ValueError('Version key must be between 0 and 4')
        elif isinstance(key, str):
            if hasattr(self, key):
                return setattr(self, key, value)
            raise ValueError('Version key must be major, minor, tiny, micro or nano')
        raise ValueError('Expected version key to be string or integer')

    # 11.2 is in 11, but 11 is not in 11.2
    def __contains__(self, version):
        assert isinstance(version, Version)
        does_match = True
        for i in xrange(len(version)):
            if self[i] != version[i]:
                does_match = False
            if not does_match and self[i] != 0:
                return False
        return True

    def __str__(self):
        len_to_print = 1
        for i in xrange(len(self)):
            if self[i]:
                len_to_print = i + 1
        result = str(self.major)
        for i in xrange(len_to_print - 1):
            result += '.{}'.format(self[i + 1])
        return result

    def __cmp__(self, other):
        if other is None:
            return 1
        for i in xrange(len(self)):
            if cmp(self[i], other[i]):
                return cmp(self[i], other[i])
        return 0