Module ZestyParser.AHT

Version: 0.8.0

Author: Adam Atlas

Contact:

adam@atlas.st

This module is now deprecated in favour of Tags. The documentation and classes are still available to assist in converting code that uses AHT, but this module may be removed in a future version. In general, given some AHT environment E, code can be converted to use Tags by changing callback=/to=/as=/>> E.x to callback=/to=/>> Tags.x and isinstance(y, E.x) to y in Tags.x.

AHT (Ad Hoc Types) is a utility module providing an easy way to generate "labels" for objects in abstract parse trees without defining a class for each one.

To use it, create an instance of Env. Now you can access any property on it and get a unique type for that name. The first time such a type is called, it becomes a subclass of the type of whatever it is passed. For example, EnvInstance.SomeEntity("hi") marks SomeEntity as being a subclass of str, and returns an instance of itself initialized with "hi".) Now you can check at any time with nothing more than a isinstance(something, EnvInstance.SomeEntity) how a piece of data was instantiated.

Copyright: Copyright 2006-2007 Adam Atlas. Released under the MIT license (see LICENSE.txt).