# Copyright 2022 The PECOS Developers
#
# 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.


class Node:
    """Base language object."""


class Operation(Node):
    """A fundamental unit of work."""


class Statement(Operation):
    """Statements are units that do something."""


class Expression(Operation):
    """Expressions are operations that evaluate to a values."""
