1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
Verion string utilities.
"""
import re
_INF = float('inf')
_NULL = (), _INF
_DIGITS_RE = re.compile(r'^\d+$')
_PREFIXES = {
'dev': 0.0001,
'alpha': 0.001,
'beta': 0.01,
'rc': 0.1
}
class VersionString(unicode):
"""
Version string that can be compared, sorted, made unique in a set, and used as a unique dict
key.
The primary part of the string is one or more dot-separated natural numbers. Trailing zeroes
are treated as redundant, e.g. "1.0.0" == "1.0" == "1".
An optional qualifier can be added after a "-". The qualifier can be a natural number or a
specially treated prefixed natural number, e.g. "1.1-beta1" > "1.1-alpha2". The case of the
prefix is ignored.
Numeric qualifiers will always be greater than prefixed integer qualifiers, e.g. "1.1-1" >
"1.1-beta1".
Versions without a qualifier will always be greater than their equivalents with a qualifier,
e.g. e.g. "1.1" > "1.1-1".
Any value that does not conform to this format will be treated as a zero version, which would
be lesser than any non-zero version.
For efficient list sorts use the ``key`` property, e.g.::
sorted(versions, key=lambda x: x.key)
"""
NULL = None # initialized below
def __init__(self, value=None):
if value is not None:
super(VersionString, self).__init__(value)
self.key = parse_version_string(self)
def __eq__(self, version):
if not isinstance(version, VersionString):
version = VersionString(version)
return self.key == version.key
def __lt__(self, version):
if not isinstance(version, VersionString):
version = VersionString(version)
return self.key < version.key
def __hash__(self):
return self.key.__hash__()
def parse_version_string(version): # pylint: disable=too-many-branches
"""
Parses a version string.
:param version: version string
:returns: primary tuple and qualifier float
:rtype: ((:obj:`int`), :obj:`float`)
"""
if version is None:
return _NULL
version = unicode(version)
# Split to primary and qualifier on '-'
split = version.split('-', 1)
if len(split) == 2:
primary, qualifier = split
else:
primary = split[0]
qualifier = None
# Parse primary
split = primary.split('.')
primary = []
for element in split:
if _DIGITS_RE.match(element) is None:
# Invalid version string
return _NULL
try:
element = int(element)
except ValueError:
# Invalid version string
return _NULL
primary.append(element)
# Remove redundant zeros
for element in reversed(primary):
if element == 0:
primary.pop()
else:
break
primary = tuple(primary)
# Parse qualifier
if qualifier is not None:
if _DIGITS_RE.match(qualifier) is not None:
# Integer qualifier
try:
qualifier = float(int(qualifier))
except ValueError:
# Invalid version string
return _NULL
else:
# Prefixed integer qualifier
value = None
qualifier = qualifier.lower()
for prefix, factor in _PREFIXES.iteritems():
if qualifier.startswith(prefix):
value = qualifier[len(prefix):]
if _DIGITS_RE.match(value) is None:
# Invalid version string
return _NULL
try:
value = float(int(value)) * factor
except ValueError:
# Invalid version string
return _NULL
break
if value is None:
# Invalid version string
return _NULL
qualifier = value
else:
# Version strings with no qualifiers are higher
qualifier = _INF
return primary, qualifier
VersionString.NULL = VersionString()
|
