Re: [PyCrust] Attribute list hook

[Neil H. <ne...@sc...>]

Me:
>    If not, I propose a convention which is to provide a getAttributeNames
> method on any class that wants to expose its dynamic (or semi-dynamic)
> attributes to shells.

   Here is an implementation to stick on PythonCard's widget class:

    def getAttributeNames(self):
        names = []
        for method in self.__class__.__dict__.keys():
            if method.startswith("get"):
                name = method[3:]
                if name and self.__class__.__dict__.has_key("set" + name):
                    names.append(name[0].lower() + name[1:])
        for base in self.__class__.__bases__:
            for method in base.__dict__.keys():
                if method.startswith("get"):
                    name = method[3:]
                    if name and base.__dict__.has_key("set" + name):
                        names.append(name[0].lower() + name[1:])
        return names

   This implementation only returns names where there is both a set* and a
get* method available. Other implementations may allow read only attributes
or may interrogate a database to find the list.

   PyCrust can be changed to use this with the getAttributes method in
PyCrustInterp.py changed to:

    def getAttributes(self, object):
        # Return a list of attributes, including inherited, for an object.
        try:
            attributes = dir(object)
            if hasattr(object, '__class__'):
                attributes += self.getAttributes(object.__class__)
                try:
                    attributes += object.getAttributeNames()
                except AttributeError:
                    pass
            if hasattr(object, '__bases__'):
    ...

   Neil