# Copyright (c) 2020
#
# 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
#
#     https://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.


"""Provide a mixin that indicates an element type does not have children."""


from typing import Iterable

from ..model.element import Element


class ChildlessMixin:
    """Define a mixin for childless element types."""

    @property
    def child_elements(self) -> Iterable[Element]:
        """Return child elements (from `Element.children`)."""
        return []
