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
|
##############################################################################
# Copyright (c) 2013, Lawrence Livermore National Security, LLC.
# Produced at the Lawrence Livermore National Laboratory.
#
# This file is part of Spack.
# Written by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
# LLNL-CODE-647188
#
# For details, see https://scalability-llnl.github.io/spack
# Please also see the LICENSE file for our notice and the LGPL.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License (as published by
# the Free Software Foundation) version 2.1 dated February 1999.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
# conditions of the GNU General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
##############################################################################
"""
Functions for comparing values that may potentially be None.
These none_high functions consider None as greater than all other values.
"""
# Preserve builtin min and max functions
_builtin_min = min
_builtin_max = max
def lt(lhs, rhs):
"""Less-than comparison. None is greater than any value."""
return lhs != rhs and (rhs is None or (lhs is not None and lhs < rhs))
def le(lhs, rhs):
"""Less-than-or-equal comparison. None is greater than any value."""
return lhs == rhs or lt(lhs, rhs)
def gt(lhs, rhs):
"""Greater-than comparison. None is greater than any value."""
return lhs != rhs and not lt(lhs, rhs)
def ge(lhs, rhs):
"""Greater-than-or-equal comparison. None is greater than any value."""
return lhs == rhs or gt(lhs, rhs)
def min(lhs, rhs):
"""Minimum function where None is greater than any value."""
if lhs is None:
return rhs
elif rhs is None:
return lhs
else:
return _builtin_min(lhs, rhs)
def max(lhs, rhs):
"""Maximum function where None is greater than any value."""
if lhs is None or rhs is None:
return None
else:
return _builtin_max(lhs, rhs)
|
