text: #
  # This source file is part of the EdgeDB open source project.
  #
  # Copyright 2016-present MagicStack Inc. and the EdgeDB authors.
  #
  # 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.
  #
  
  
  from __future__ import annotations
  import typing
  
  
  class Schema:
      pass
  
  
  class Reducible:
      """An interface implemented by all non-builtin objects stored in schema."""
  
      def schema_reduce(self) -> typing.Any:
          """Return a primitive representation of the object.
  
          The return value must consist of primitive Python objects.
          """
          raise NotImplementedError
  
      @classmethod
      def schema_restore(
          cls,
          data: typing.Any,
      ) -> Reducible:
          """Restore object from data returned by *schema_reduce*."""
          raise NotImplementedError
  
  
  class Object:
      pass
  
  
  class Database(Object):
      pass
  
  
  class Migration(Object):
      pass
  
  
  class Constraint(Object):
      pass
  
  
  class Callable(Object):
      pass
  
  
  class Function(Callable):
      pass
  
  
  class Operator(Callable):
      pass
  
  
  class Cast(Callable):
      pass
  
  
  class Parameter(Object):
      pass
  
  
  class Type(Object):
      pass
  
  
  class ScalarType(Type):
      pass
  
  
  class ObjectType(Type):
      pass
  
  
  class Collection(Type):
      pass
  
  
  class Tuple(Collection):
      pass
  
  
  class Array(Collection):
      pass
  
  
  class Pointer(Object):
      pass
  
  
  class Property(Pointer):
      pass
  
  
  class Link(Pointer):
      pass
  
  
  class Expression:
      pass
  