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
|
# Copyright (C) 2013-2014 Red Hat, 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT OWNER OR 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.
#
# The views and conclusions contained in the software and documentation are
# those of the authors and should not be interpreted as representing official
# policies, either expressed or implied, of the FreeBSD Project.
#
# Authors: Michal Minar <miminar@redhat.com>
#
"""
Utility functions used in command sub-package.
"""
import re
#: Regular expression matching bracket argument such as ``<arg_name>``.
RE_OPT_BRACKET_ARGUMENT = re.compile('^<(?P<name>[^>]+)>$')
#: Regular expression matching argument written in upper case such as
#:``ARG_NAME``.
RE_OPT_UPPER_ARGUMENT = re.compile('^(?P<name>[A-Z0-9]+(?:[_-][A-Z0-9]+)*)$')
#: Regular expression matching showt options. They are one character
#: long, prefixed with single dash.
RE_OPT_SHORT_OPTION = re.compile('^-(?P<name>[a-z])$', re.IGNORECASE)
#: Regular expression matching long options (prefixed with double dash).
RE_OPT_LONG_OPTION = re.compile('^--(?P<name>[a-z0-9_-]+)$', re.IGNORECASE)
#: Command name can also be a single or double dash.
RE_COMMAND_NAME = re.compile(r'^([a-z]+(-[a-z0-9]+)*|--?)$')
def is_abstract_method(clss, method, missing_is_abstract=False):
"""
Check, whether the given method is abstract in given class or list of
classes. May be used to check, whether we should override particular
abstract method in a meta-class in case that no non-abstract
implementation is defined.
:param clss: Class or list of classes that is
searched for non-abstract implementation of particular method.
If the first class having particular method in this list contain
non-abstract implementation, ``False`` is returned.
:type clss: type or tuple
:param string method: Name of method to look for.
:param boolean missing_is_abstract: This is a value returned, when
not such method is defined in a set of given classes.
:returns: Are all occurences of given method abstract?
:rtype: boolean
"""
if ( not isinstance(clss, (list, tuple, set))
and not isinstance(clss, type)):
raise TypeError("clss must be either a class or a tuple of classes")
if not isinstance(method, basestring):
raise TypeError("method must be a string")
if isinstance(clss, type):
clss = [clss]
for cls in clss:
if hasattr(cls, method):
if getattr(getattr(cls, method), "__isabstractmethod__", False):
return True
else:
return False
return missing_is_abstract
|
