The problem here is just that you actually have a nested code context when for
the top-level code you just need a single global context. Replace the line:
var codeContext = new CodeContext(
new PythonDictionary(),
moduleContext);
with:
var codeContext = moduleContext.GlobalContext;
and it’ll work. The nested code context that you’re creating is only used for
when we’re inside of a function definition or a class definition.
Also you can avoid creating the script scope and just pull Example out of the
globals dictionary as well.
From: [email protected]
[mailto:[email protected]] On Behalf Of Justin Chase
Sent: Wednesday, April 14, 2010 11:24 AM
To: Discussion of IronPython
Subject: Re: [IronPython] Building via AST
I feel like I'm sooooo close but something isn't quite working. Here is my
current code:
var runtime = Python.CreateRuntime();
runtime.LoadAssembly(typeof(IExample).Assembly);
var engine =
runtime.GetEngineByFileExtension(".py");
var context =
(PythonContext)HostingHelpers.GetLanguageContext(engine);
var globals = new PythonDictionary();
globals.Add("__name__", "<test>"); // I get
an exception without this.
var options = new
PythonCompilerOptions(ModuleOptions.ExecOrEvalCode | ModuleOptions.Initialize);
var unit = new SourceUnit(context,
NullTextContentProvider.Null, "", SourceCodeKind.Statements);
var moduleContext = new
ModuleContext(globals, context);
var codeContext = new CodeContext(
new PythonDictionary(),
moduleContext);
var classDefinition = new
IronPython.Compiler.Ast.ClassDefinition(
"Example",
new Expression[] { },
new FunctionDefinition(
"Do",
new[] { new
Parameter("self") },
new
ReturnStatement(new ConstantExpression("hello python!"))));
var pythonAst = new PythonAst(
new
IronPython.Compiler.Ast.SuiteStatement(new Statement[] { /* import, */
classDefinition }),
false,
ModuleOptions.ExecOrEvalCode,
false,
new CompilerContext(
unit,
options,
new
ThrowsErrorSink()));
pythonAst.Bind();
var lambda =
(System.Linq.Expressions.LambdaExpression)pythonAst.Reduce();
var func = (Func<CodeContext, FunctionCode,
object>)lambda.Compile();
var result = func(codeContext, null); //
result is null
dynamic python =
HostingHelpers.CreateScriptScope(engine, moduleContext.GlobalScope);
dynamic example = python.Example(); // fails!
Example is not in scope.
Console.WriteLine(example.Do());
Console.ReadKey(true);
Can anyone tell me what I'm missing? This has got to be pretty close.
On Mon, Apr 12, 2010 at 7:51 PM, Justin Chase
<[email protected]<mailto:[email protected]>> wrote:
Awesome. I will thanks.
On Apr 12, 2010 7:49 PM, "Dino Viehland"
<[email protected]<mailto:[email protected]>> wrote:
This might be possible. If you wrap this all up in a PythonAst object (calling
the constructor which takes a CompilerContext), call Bind on it then you should
get a LambdaExpression back out. You can Compile() on that.
But it’s not like this is well traveled territory and this only applies to
2.6.1 (before that the trees weren’t DLR ASTs so they weren’t reducable). When
we do this ourselves we also call the produced delegate and flow in some data.
The delegate is going to want at least a FunctionCode object as an argument but
I think you could get away with passing null (at least as long as no exceptions
are thrown). The delegate might also want a CodeContext object as well
depending on the compilation mode we end up using (which is based on the
CompilerContext you give us). This you wouldn’t be able to get away w/ passing
null. But you can get one by doing new ModuleContext(new PythonDictionary(),
pythonContext).GlobalContext. The HostingHelpers class can give you a
LanguageContext from the ScriptEngine for Python which you can cast to a
PythonContext.
Let me know if it works! ☺
From:
[email protected]<mailto:[email protected]>
[mailto:[email protected]<mailto:[email protected]>]
On Behalf Of Justin Chase
Sent: Monday, April 12, 2010 4:09 PM
To: Discussion of IronPython Subject: Re: [IronPython] Building via AST
Ok, so at risk of being a nuissance I have one last question because I feel
like I'm half way t...
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Justin Chase
http://www.justnbusiness.com
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