#     Copyright 2026, Kay Hayen, mailto:kay.hayen@gmail.com find license text at end of file


"""Operations on the tree.

This is mostly for the different kinds of visits that the node tree can have.
You can visit a scope, a tree (module), or every scope of a tree (module).

"""


def visitTree(tree, visitor):
    visitor.onEnterNode(tree)

    for visitable in tree.getVisitableNodes():
        if visitable is None:
            raise AssertionError("'None' child encountered", tree, tree.source_ref)

        visitTree(visitable, visitor)

    visitor.onLeaveNode(tree)


class VisitorNoopMixin(object):
    def onEnterNode(self, node):
        """Overloaded for operation before the node children were done."""

    def onLeaveNode(self, node):
        """Overloaded for operation after the node children were done."""


#     Part of "Nuitka", an optimizing Python compiler that is compatible and
#     integrates with CPython, but also works on its own.
#
#     Licensed under the GNU Affero General Public License, Version 3 (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.gnu.org/licenses/agpl-3.0.txt
#
#     See also: "Nuitka Runtime Library Exception, Version 1.0" in file
#     "LICENSE-RUNTIME.txt" for additional permissions granted under Section 7.
#
#     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.
