78 lines
2.4 KiB
Python
78 lines
2.4 KiB
Python
# Copyright (c) 2011 OpenStack Foundation.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import operator
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from oslo_utils import strutils
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# 1. The following operations are supported:
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# =, s==, s!=, s>=, s>, s<=, s<, <in>, <is>, <or>, ==, !=, >=, <=
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# 2. Note that <or> is handled in a different way below.
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# 3. If the first word in the extra_specs is not one of the operators,
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# it is ignored.
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_op_methods = {'=': lambda x, y: float(x) >= float(y),
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'<in>': lambda x, y: y in x,
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'<is>': lambda x, y: (strutils.bool_from_string(x) is
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strutils.bool_from_string(y)),
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'==': lambda x, y: float(x) == float(y),
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'!=': lambda x, y: float(x) != float(y),
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'>=': lambda x, y: float(x) >= float(y),
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'<=': lambda x, y: float(x) <= float(y),
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's==': operator.eq,
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's!=': operator.ne,
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's<': operator.lt,
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's<=': operator.le,
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's>': operator.gt,
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's>=': operator.ge}
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def match(value, req):
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if req is None:
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if value is None:
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return True
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else:
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return False
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words = req.split()
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op = method = None
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if words:
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op = words.pop(0)
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method = _op_methods.get(op)
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if op != '<or>' and not method:
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return value == req
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if value is None:
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return False
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if op == '<or>': # Ex: <or> v1 <or> v2 <or> v3
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while True:
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if words.pop(0) == value:
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return True
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if not words:
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break
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op = words.pop(0) # remove a keyword <or>
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if not words:
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break
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return False
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try:
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if words and method(value, words[0]):
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return True
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except ValueError:
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pass
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return False
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