82 lines
2.1 KiB
Python
82 lines
2.1 KiB
Python
# Copyright 2015 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 six
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import yaql
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def seq_iter(obj):
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if isinstance(obj, dict):
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for k, v in six.iteritems(obj):
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yield k, v
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elif isinstance(obj, list):
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for i in xrange(len(obj)):
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yield i, obj[i]
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class YAQLParser(object):
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engine_options = {
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'yaql.limitIterators': 100,
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'yaql.treatSetsAsLists': True,
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'yaql.memoryQuota': 10000
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}
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def __init__(self, data, context):
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self.factory = yaql.YaqlFactory()
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self.parser = self.factory.create(options=self.engine_options)
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self.context = context
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self.data = data
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def parse(self):
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return self.parser(self.data).evaluate(self.context)
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class NoopParser(object):
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def __init__(self, data, _):
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self.data = data
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def parse(self):
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return self.data
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class ExpressionsParser(object):
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yaql_re = re.compile(r'^\s*yaql\s*=\s*')
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def __init__(self, template, context):
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self.template = template
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self.context = context
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def parse(self):
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return self._walk(self.template)
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def _walk(self, node):
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if isinstance(node, six.string_types):
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return self.get_parser(node).parse()
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for key, item in seq_iter(node):
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node[key] = self._walk(item)
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return node
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def get_parser(self, node):
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if self.yaql_re.match(node):
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wo_prefix = self.yaql_re.sub('', node)
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return YAQLParser(wo_prefix, self.context)
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return NoopParser(node, self.context)
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