61 lines
1.7 KiB
Python
61 lines
1.7 KiB
Python
# Copyright (c) 2014 Mirantis, Inc.
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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 re
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import yaql
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from yaql.language import exceptions as yaql_exc
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def _set_up_yaql():
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legacy_engine_options = {
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'yaql.limitIterators': 10000,
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'yaql.memoryQuota': 1000000
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}
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return yaql.YaqlFactory().create(options=legacy_engine_options)
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YAQL = _set_up_yaql()
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class YaqlExpression(object):
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def __init__(self, expression):
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self._expression = str(expression)
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self._parsed_expression = YAQL(self._expression)
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def expression(self):
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return self._expression
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def __repr__(self):
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return 'YAQL(%s)' % self._expression
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def __str__(self):
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return self._expression
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@staticmethod
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def match(expr):
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if not isinstance(expr, str):
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return False
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if re.match('^[\s\w\d.:]*$', expr):
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return False
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try:
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YAQL(expr)
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return True
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except yaql_exc.YaqlGrammarException:
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return False
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except yaql_exc.YaqlLexicalException:
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return False
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def evaluate(self, data=yaql.utils.NO_VALUE, context=None):
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return self._parsed_expression.evaluate(data=data, context=context)
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