[IronPython] Determine the classes/interfaces a Python implements

[Dino Viehland]

Can you open a feature request on CodePlex?  It's certainly an interesting idea to ponder and I'm leaning towards it but there's lots of details to be gotten right.

Do you know if this needs to work w/ sockets as well?  (There's also the question of can we make it work with sockets?  :))

There'll be a bunch of places we need to update (nt, socket, file, select, etc...) so I think it'll have to wait until 2.1 instead of coming in a minor update like 2.0.1.

-----Original Message-----
From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Michael Foord
Sent: Monday, December 15, 2008 1:20 PM
To: Discussion of IronPython
Subject: Re: [IronPython] Determine the classes/interfaces a Python implements


Hi Jeff,

Probably the easiest way of doing this is to define a Python function
that uses issubtype. You can use this as a delegate from the C# side
(warning untested):

ScriptScope scope = engine.CreateScope();
ScriptSource imports = engine.CreateScriptSourceFromString("from System
import ISomething", SourceCodeKind.Staatements);
imports.Execute(scope);
ScriptSource source = engine.CreateScriptSourceFromString("lambda x:
issubtype(x, ISomething)", SourceCodeKind.Expression);
Func<object, bool> Implements = (scope)source.Execute(scope);

bool result = Implements(some_object);


Note that issubtype will barf if you give it anything other than a type,
so it may make more sense to define a function with exception handling
and pull it out of the scope instead.

HTH

Michael Foord


Jeff Slutter wrote:
> I have a Python script that creates a class within it. This Python class
> is derived off of a class, or interface, I made in C# - something like:
>
> class MyClass(Test.MainForm.IScript):
>     ...
>
> Now, back in C#, I have gotten access to "MyClass" by:
>
> object myclass = someScope.GetVariable("MyClass");
>
> Is there a way to determine either:
> a) what classes/interfaces MyClass implements OR
> b) if it implements a specific class/interface
>
> I want to know if the "object myclass" is supposed to implement
> Test.MainForm.IScript or not.
>
> I don't want to create an instance of MyClass as this would cause
> problems, executing things I'm not ready to execute.
>
> Also, related but not as important, implementing an interface (as above)
> doesn't cause any compiler errors if I'm missing functions - is there a
> way to enforce this?
>
>
> Thanks,
> Jeff
> _______________________________________________
> Users mailing list
> Users at lists.ironpython.com
> http://lists.ironpython.com/listinfo.cgi/users-ironpython.com
>


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