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# Copyright 2012-2015 Amazon.com, Inc. or its affiliates. All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"). You # may not use this file except in compliance with the License. A copy of # the License is located at # # http://aws.amazon.com/apache2.0/ # # or in the "license" file accompanying this file. This file is # distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF # ANY KIND, either express or implied. See the License for the specific # language governing permissions and limitations under the License. import yaml from awscli.compat import six from yaml.resolver import ScalarNode, SequenceNode def intrinsics_multi_constructor(loader, tag_prefix, node): """ YAML constructor to parse CloudFormation intrinsics. This will return a dictionary with key being the instrinsic name """ # Get the actual tag name excluding the first exclamation tag = node.tag[1:] # All CloudFormation intrinsics have prefix Fn:: except Ref prefix = "Fn::" if tag == "Ref": prefix = "" cfntag = prefix + tag if tag == "GetAtt" and isinstance(node.value, six.string_types): # ShortHand notation for !GetAtt accepts Resource.Attribute format # while the standard notation is to use an array # [Resource, Attribute]. Convert shorthand to standard format value = node.value.split(".", 1) elif isinstance(node, ScalarNode): # Value of this node is scalar value = loader.construct_scalar(node) elif isinstance(node, SequenceNode): # Value of this node is an array (Ex: [1,2]) value = loader.construct_sequence(node) else: # Value of this node is an mapping (ex: {foo: bar}) value = loader.construct_mapping(node) return {cfntag: value} def yaml_dump(dict_to_dump): """ Dumps the dictionary as a YAML document :param dict_to_dump: :return: """ return yaml.safe_dump(dict_to_dump, default_flow_style=False) def yaml_parse(yamlstr): yaml.SafeLoader.add_multi_constructor("!", intrinsics_multi_constructor) return yaml.safe_load(yamlstr)
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