src/mdis/visitor.py

   1 __all__ = [
   2     "ContextVisitor",
   3     "Visitor",
   4     "VisitorMeta",
   5 ]
   6
   7 import contextlib
   8
   9 from . import dispatcher
  10
  11
  12 class VisitorMeta(dispatcher.DispatcherMeta):
  13     pass
  14
  15
  16 class Visitor(dispatcher.Dispatcher, metaclass=VisitorMeta):
  17     @dispatcher.Hook(object)
  18     def dispatch_object(self, node, *arguments):
  19         return node
  20
  21
  22 class ContextVisitor(Visitor):
  23     @dispatcher.Hook(object)
  24     @contextlib.contextmanager
  25     def dispatch_object(self, node, *arguments):
  26         yield super().__call__(node, *arguments)