[IronPython] How to nest ScriptScopes

[Marty Nelson]

Yes, that would be a good logical next step for such code.

 

As far as the concept of the approach, it seems like I have two
approaches for producing both and outer. notation and import of outer
into inner.

 

It seems that functions that I add to outer are returned as variables as
well, which is a nice thing :-)

 

I did notice the "__builtins__" variable, should I avoid copying this?

 

________________________________

From: users-bounces at lists.ironpython.com
[mailto:users-bounces at lists.ironpython.com] On Behalf Of Seshadri
Pillailokam Vijayaraghavan
Sent: Friday, May 09, 2008 11:16 AM
To: Discussion of IronPython
Subject: Re: [IronPython] How to nest ScriptScopes

 

You can use C# extension methods
<http://msdn.microsoft.com/en-us/library/bb383977.aspx>  to copy the
variables without cluttering up the code too much

 

Here's what the code would look like...

 

    internal static class Extensions{

 

        internal static void SetOuter(this ScriptScope scope,
ScriptScope outerScope) {

            scope.SetVariable("outer", outerScope);

            foreach (string name in outerScope.VariableNames) {

                scope.SetVariable(name, outerScope.GetVariable(name));

            }

        }

 

        internal static ScriptScope GetOuter(this ScriptScope scope) {

            return scope.GetVariable<ScriptScope>("outer");

        }

 

    }

 

You can then invoke it like this : innerScope.SetOuter(outerScope);

      

Hope that helps

sesh

From: users-bounces at lists.ironpython.com
[mailto:users-bounces at lists.ironpython.com] On Behalf Of Marty Nelson
Sent: Friday, May 09, 2008 10:44 AM
To: Discussion of IronPython
Subject: Re: [IronPython] How to nest ScriptScopes

 

That seems to work, although I used inner to execute (see below).  

 

[TestMethod]

public void TestMethod1()

{

    var outerscope = _env.CreateScope();

    var innerscope = _env.CreateScope();

 

    int outerInput = 3;

    int innerInput = 2;

    outerscope.SetVariable("value", outerInput);

    innerscope.SetVariable("outer", outerscope);

    innerscope.SetVariable("value", innerInput);

 

    _pe.CreateScriptSourceFromString("result = outer.value + value",
SourceCodeKind.Statements)

        .Execute(innerscope);

    var result = innerscope.GetVariable<int>("result");

    Assert.AreEqual(outerInput + innerInput, result);

 

    object ignore;

    Assert.IsFalse(outerscope.TryGetVariable("result", out ignore));

}

 

I'd prefer not to have the dot notation (I know in my sample I had
conflicting variable names, but I don't expect that to be the case.
It's more a layering of available variables) .  Is there some python
function I could write that would go through the outerscope and create
variables at the inner scope using the name?  Or I'm I making this
harder than it needs to be?  See below, where I just copied the
variables.

 

[TestMethod]

public void TestMethod2()

{

    var outerscope = _env.CreateScope();

    var innerscope = _env.CreateScope();

 

    int outerInput = 3;

    int innerInput = 2;

    outerscope.SetVariable("foo", outerInput);

 

    foreach (string name in outerscope.VariableNames)

    {

        innerscope.SetVariable(name, outerscope.GetVariable(name));

    }

    innerscope.SetVariable("bar", innerInput);

 

    _pe.CreateScriptSourceFromString("result = foo + bar",
SourceCodeKind.Statements)

        .Execute(innerscope);

    var result = innerscope.GetVariable<int>("result");

    Assert.AreEqual(outerInput + innerInput, result);

 

    object ignore;

    Assert.IsFalse(outerscope.TryGetVariable("result", out ignore));

}

 

Also, what does "when you have a closure" mean?

 

 

________________________________

From: users-bounces at lists.ironpython.com
[mailto:users-bounces at lists.ironpython.com] On Behalf Of Dino Viehland
Sent: Friday, May 09, 2008 9:59 AM
To: Discussion of IronPython
Subject: Re: [IronPython] How to nest ScriptScopes

 

It's not really intended that you nest the scopes yourself - usually the
scopes only get nested when you have a closure.  And then we'll burn
references into the parent scopes tuple's directly so we might not even
see nested variables (although in some cases we might due a full runtime
lookup and see them).

 

Instead of nesting them can you have a ScriptScope that contains other
ScriptScope's?  In other words your inner most level is just a
collection of ScriptScope's which you publish under some well known name
into the outer level.  Then users can dot through them:

 

outermost = new ScriptScope();

innermost = new ScriptScope();

innermost.SetVariable("somevalue", 3);

outermost.SetVariable("next", innermost);

 

then run in outermost.

 

 

From: users-bounces at lists.ironpython.com
[mailto:users-bounces at lists.ironpython.com] On Behalf Of Marty Nelson
Sent: Friday, May 09, 2008 9:52 AM
To: users at lists.ironpython.com
Subject: [IronPython] How to nest ScriptScopes

 

I've gone over the 2.0 B2 source code, but I'm not clear how I might
create nested ScriptScopes using the API in C#

 

One of the tests in EngineTests.cs uses "from published_context_test
import x" but this is only one variable, and I'd rather do it from the
C# setup side anyway.

 

I noticed that Scope, which ScriptScope contains, has the ability to
take a parent Scope, but I'm not clear how I would do this.  It seems
not to be exposed via ScriptScope.

 

We are using IronPython as a script based extension mechanism for our C#
application, my interest is to have a set of established scopes that I
can populate with the variables of current application objects at the
appropriate level for the current script.

 

Thanks,

 

Marty Nelson

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