diff options
Diffstat (limited to 'azure/aria/aria-extension-cloudify/src/aria/aria/parser/presentation/null.py')
-rw-r--r-- | azure/aria/aria-extension-cloudify/src/aria/aria/parser/presentation/null.py | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/azure/aria/aria-extension-cloudify/src/aria/aria/parser/presentation/null.py b/azure/aria/aria-extension-cloudify/src/aria/aria/parser/presentation/null.py new file mode 100644 index 0000000..287d2ba --- /dev/null +++ b/azure/aria/aria-extension-cloudify/src/aria/aria/parser/presentation/null.py @@ -0,0 +1,67 @@ +# Licensed to the Apache Software Foundation (ASF) under one or more +# contributor license agreements. See the NOTICE file distributed with +# this work for additional information regarding copyright ownership. +# The ASF licenses this file to You under the Apache License, Version 2.0 +# (the "License"); you may not use this file except in compliance with +# the License. You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License 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. + +from ...utils.collections import deepcopy_with_locators + + +class Null(object): + """ + Represents an explicit null value provided by the user, which is different from + not supplying a value at all. + + It is a singleton. + """ + + @property + def as_raw(self): + return None + +NULL = Null() + + +def none_to_null(value): + """ + Convert ``None`` to ``NULL``, recursively. + """ + + if value is None: + return NULL + if isinstance(value, list): + value = deepcopy_with_locators(value) + for i, _ in enumerate(value): + value[i] = none_to_null(value[i]) + elif isinstance(value, dict): + value = deepcopy_with_locators(value) + for k, v in value.iteritems(): + value[k] = none_to_null(v) + return value + + +def null_to_none(value): + """ + Convert ``NULL`` to ``None``, recursively. + """ + + if value is NULL: + return None + if isinstance(value, list): + value = deepcopy_with_locators(value) + for i, _ in enumerate(value): + value[i] = none_to_null(value[i]) + elif isinstance(value, dict): + value = deepcopy_with_locators(value) + for k, v in value.iteritems(): + value[k] = none_to_null(v) + return value |