# Copyright 2015 David Stanek <dstanek@dstanek.com>
#
# 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.

import ast


class _Transformer(ast.NodeTransformer):

    def visit_FunctionDef(self, node):
        node.decorator_list.append(ast.Name('ensure_types', ast.Load()))
        return node


def transform(code):
    tree = ast.parse(code)
    _Transformer().visit(tree)
    tree = ast.fix_missing_locations(tree)
    return tree
