rules_python/python/private/enum.bzl at patch-1 · dcode/rules_python

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# Licensed 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.

"""Enum-like object utilities

This is a separate file to minimize transitive loads.

"""

def enum(methods = {}, **kwargs):

"""Creates a struct whose primary purpose is to be like an enum.

Args:

methods: {type}`dict[str, callable]` functions that will be

added to the created enum object, but will have the enum object

itself passed as the first positional arg when calling them.

**kwargs: The fields of the returned struct. All uppercase names will

be treated as enum values and added to `__members__`.

Returns:

`struct` with the given values. It also has the field `__members__`,

which is a dict of the enum names and values.

"""

members = {

key: value

for key, value in kwargs.items()

if key.upper() == key

}

for name, unbound_method in methods.items():

# buildifier: disable=uninitialized

kwargs[name] = lambda *a, **k: unbound_method(self, *a, **k)

self = struct(__members__ = members, **kwargs)

return self

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