I figured out that ScriptRuntime and ScriptScope are still language
agnostic.
So if you want to host IronRuby in your application you're always
looking at Level 2 hosting as soon as you want some communication
between Host and IronRuby, because you need the RubyEngine.
I'm still a bit unsure of how the ScriptScope ties in to everything.
I understand that the ScriptRuntime is like the complete host for dyn
languages and you can create a bunch of them they will always run in
isolation.
But how does ScriptScope work because so far I've been unsuccessful in
talking to a ScriptScope ?
Is this hosting API still too much of a moving target to really get into
it?
Ivan Porto Carrero wrote:
> Hi,
>
> I updated the hosting wiki page to work with the current revision. But
> this
> raises a couple of questions.
>
> I'm just working my way through the dlr-hosting-spec.
> And if I read it correctly then there are 3 levels of
> hosting/integration
> possible.
>
> Now AFAICT level 1 hosting is only supposed to work with external files,
> because for compiling to a source unit you need a different class than
> either ScriptRuntime or ScriptScope
> I was expecting when I set a variable in globals that it becomes a
> global
> variable or do I have to access that differently?
>
> So I tried the following bit of code:
>
> ScriptRuntime runtime = IronRuby.CreateRuntime();
> runtime.Globals.SetVariable("version", "simplest test possible with a
> variable succeeded");
> runtime.ExecuteFile("commands.rb");
>
> and the file commands.rb contains one line of ruby code: puts $version
> put the output of that code is nil instead of the expected string.
>
> This returns nil. I have trouble reconciling that with what I read in
> the
> hosting spec. Because this should be totally doable with Level 1 hosting
> or
> am I wrong in this assumption?
>
> When I create a ScriptRuntime shouldn't it then have a DefaultScope
> (Globals) that is language-specific to ruby because I create it with the
> static method on IronRuby?
>
> Also for as far as i understand it a ScriptScope is like a container for
> your scripts so globals in that container are only alive in that script
> scope?
>
> Anyway when I go and use level 2 hosting because I need the execution
> context and script engine and these are only introduced in level 2
> hosting.
> I can set global variables and then things do work
>
> ScriptRuntime runtime = IronRuby.CreateRuntime();
> ScriptEngine rubyengine = IronRuby.GetEngine(runtime);
> RubyExecutionContext ctx = IronRuby.GetExecutionContext(runtime);
>
> ctx.GlobalVariables[SymbolTable.StringToId("variable")] = "simplest test
> possible with a variable succeeded";
> runtime.ExecuteSourceUnit(rubyengine.CreateScriptSourceFromString("puts
> \"#{$variable}\""));
>
> And in the level 2 hosting sample the RubyExecutionContext seems to do
> what
> I was expecting ScriptScope to do.
>
> Am I reading the spec wrong ?
>
> Cheers
> Ivan
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