[IronPython] Accessing the Engine's module

[adnand dragoti]

Martin Maly wrote:
> No, unfortunately. But I am curious to know what you would need from Python Engine that you don't get without accessing the frame and module directly. Our motivation is to come up with solid interface on the PythonEngine so any feedback on its possible deficiencies is absolutely welcome.
>
> Thanks!
> Martin 
>
> -----Original Message-----
> From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of adnand dragoti
> Sent: Thursday, February 02, 2006 8:55 AM
> To: Discussion of IronPython
> Subject: [IronPython] Accessing the Engine's module
>
> Hi,
>
> is there any way to access the PythonEngine's module and frame (they are
> declared private) ?
>
> Thanks in advance
> Nandi
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>   
Hi Martin,

thanks for your response.

Now, to satisfy your curiosity,
I'm playing around with a GUI console for IronPython (with intellisense,
call tips and so on ...).
In order to get the same interactive behaviour as the standard console I
implemented the IConsole
interface and  thought it would be great if I could reuse
"DoOneInteractive". Unfortunately, you need
to pass a Frame parameter there. If you create your own Module and Frame
then you have to overwrite
all the methods which implicitly use PythonEngine's private _module and
_frame (and _context) :
"Evaluate", "GetVariable", "SetVariable",... (that's  what I've actually
done)
This is in no way a satisfactory and elegant solution.

Furthermore, I wanted to "inject" a simple function
in the interpreter. I've maybe overseen something, but the only way I
found to do it was :
engine.SetVariable(new Function0(module,"functionName", new CallTarget0(
... ) ))
In this case too, you need to have a module.


My suggestion would be to have PythonEngine's contructor accept an
optional Frame as argument:

public PythonEngine(Frame top_frame) {
    ...
    if(top_frame==null) {
        _module = new PythonModule("__main__", new Dict());
        topFrame = new Frame(_module);
    }
    else {
        topFrame=top_frame;
        _module=topFrame.__module__;
    }
   ...
}

public PythonEngine() : this(null) {}


That will solve all the problems above.
By the way, while examining the code of "DoOneInteractive" I discovered
the following at line 322 (I'm referring to Beta 2):

if (context.TrueDivision) {
    _module.TrueDivision = true; // shouldn't it be
topFrame.__module__.TrueDivision ?
}



Many thanks for your attention,
Keep this excellent work going,

Nandi