mirror of https://github.com/pulumi/pulumi.git
58 lines
1.8 KiB
Python
58 lines
1.8 KiB
Python
# Copyright 2016-2020, Pulumi Corporation.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import typing
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# Empty function definitions.
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def _empty():
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...
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def _empty_doc():
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"""Empty function docstring."""
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...
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_empty_lambda = lambda: None
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_empty_lambda_doc = lambda: None
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_empty_lambda_doc.__doc__ = """Empty lambda docstring."""
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def _consts(fn: typing.Callable) -> tuple:
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"""
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Returns a tuple of the function's constants excluding the docstring.
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"""
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return tuple(x for x in fn.__code__.co_consts if x != fn.__doc__)
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# Precompute constants for each of the empty functions.
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_consts_empty = _consts(_empty)
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_consts_empty_doc = _consts(_empty_doc)
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_consts_empty_lambda = _consts(_empty_lambda)
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_consts_empty_lambda_doc = _consts(_empty_lambda_doc)
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def is_empty_function(fn: typing.Callable) -> bool:
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"""
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Returns true if the function is empty.
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"""
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consts = _consts(fn)
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return (
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(fn.__code__.co_code == _empty.__code__.co_code and consts == _consts_empty) or
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(fn.__code__.co_code == _empty_doc.__code__.co_code and consts == _consts_empty_doc) or
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(fn.__code__.co_code == _empty_lambda.__code__.co_code and consts == _consts_empty_lambda) or
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(fn.__code__.co_code == _empty_lambda_doc.__code__.co_code and consts == _consts_empty_lambda_doc)
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)
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