[IronPython] ScriptEngine.GetRegisteredExtensions()

[Curt Hagenlocher]

When you create a ScriptRuntime, you can pass in a ScriptRuntimeSetup object
that specifies additional language providers to load.  Perhaps this is less
automatic than you'd like, but if you were going to load those assemblies
into your appdomain anyway, it's just taking the extra step of looking in
that assembly for a class derived from LanguageContext.

On Wed, Jun 11, 2008 at 2:53 PM, Ben Hall <ben2004uk at googlemail.com> wrote:

> Oh!
>
> Can't remember the reason why I went for the type over the file
> extension.  But anyway, what I'm doing it manually loading in the
> language assemblies, finding the LanguageContext type (I know the name
> from an XML config file) and passing that in.
>
> I guess I could just have the file extension in the XML. My only
> concern is that when other languages come along, how do they register
> their file extension with my ScriptRuntime?
>
> I've loaded their assemblies into my appdomain, is there any
> additional logic required?  Using the type, I was confident this
> wouldn't be a problem (guess thats why I went that route).
>
> It tries to get the language context from _languageIds, which is
> populated via RegisterLanguageContext. That seems to get called via
> the _languageProviders collection.  This seems to have all cheeky
> hardcoded everything I was passing in dynamically (well, based on the
> XML).
>
> I can't see how I could dynamically load in a DLR language and create
> an engine just via the file extension. If there is a way, please let
> me know.
>
> I hope that all makes sense (wrote while debugging DLR code)
>
> Thanks
>
> Ben
>
>
> On Wed, Jun 11, 2008 at 10:33 PM, Curt Hagenlocher <curt at hagenlocher.org>
> wrote:
> > The overload of GetEngine that you're using is slated to go away. Is
> there
> > functionality you get out of doing it that way that you don't get by
> using
> > the language code or file extension?
> >
> > On Wed, Jun 11, 2008 at 2:17 PM, Ben Hall <ben2004uk at googlemail.com>
> wrote:
> >>
> >> Sorry - my code wasn't very helpful.
> >>
> >> The above code works fine, however I am creating the engine based on
> >> the type. The code demostrates the problem:
> >>
> >>            ScriptRuntime runtime = ScriptRuntime.Create();
> >>            ScriptEngine engine =
> >> runtime.GetEngine(typeof(IronPython.Runtime.PythonContext));
> >>            foreach (string s in engine.GetRegisteredExtensions())
> >>            {
> >>                System.Console.WriteLine(s);
> >>            }
> >>
> >> Thanks
> >>
> >> Ben
> >>
> >> On Wed, Jun 11, 2008 at 9:22 PM, Curt Hagenlocher <curt at hagenlocher.org
> >
> >> wrote:
> >> > I can't see into any of the helpers you've defined.  What do you get
> if
> >> > you
> >> > cut this down to the smallest possible program?
> >> >
> >> > public static void Main() {
> >> >     ScriptRuntime runtime = ScriptRuntime.Create();
> >> >     ScriptEngine engine = runtime.GetEngine("py");
> >> >     foreach (string s in engine.GetRegisteredExtensions()) {
> >> >         System.Console.WriteLine(s);
> >> >     }
> >> > }
> >> >
> >> > On Wed, Jun 11, 2008 at 12:23 PM, Ben Hall <ben2004uk at googlemail.com>
> >> > wrote:
> >> >>
> >> >> Hi,
> >> >>
> >> >> I have been using the latest release of the DLR (the one from
> >> >> yesterday) but the behaviour of GetRegisteredExtensions() seems to
> >> >> have changed (or is broke).
> >> >>
> >> >> I've got this test:
> >> >>
> >> >>        [Test]
> >> >>        public void GetSaveFilter_RegisteredTypes_String()
> >> >>        {
> >> >>            string expected = "IronPython 2.0 Beta|*.py";
> >> >>            LanguageSettings python =
> Helper.CreateIronPythonSettings();
> >> >>            DLREngineFactory factory = new DLREngineFactory();
> >> >>            ScriptEngine engine = factory.CreateEngine(python);
> >> >>
> >> >>            EngineInformation info = new EngineInformation(engine);
> >> >>            string actual = info.GetSaveFilter();
> >> >>            Assert.AreEqual(expected, actual);
> >> >>        }
> >> >>
> >> >> With IP Beta 2, this worked fine, but since upgrading it now fails.
> >> >> The code is this:
> >> >>
> >> >>        public string GetSaveFilter()
> >> >>        {
> >> >>            string filter = string.Empty;
> >> >>            foreach (string ext in Engine.GetRegisteredExtensions())
> >> >>            {
> >> >>                filter += string.Format("{0}|*{1}",
> >> >> Engine.LanguageDisplayName, ext);
> >> >>            }
> >> >>
> >> >>            return filter;
> >> >>        }
> >> >>
> >> >> >From what I can tell, the code is dropping into
> >> >> GetRegisteredFileExtensions(LanguageContext context)  which does a
> >> >> check to see if the LanguageContext is null, but it always seems to
> be
> >> >> null.
> >> >> if (kvp.Value.LanguageContext == context) {
> >> >>                        res.Add(kvp.Key);
> >> >> }
> >> >>
> >> >> Can anyone else confirm this?
> >> >>
> >> >> Its the same for GetRegisteredIdentifiers().
> >> >>
> >> >> Thanks
> >> >>
> >> >> Ben
> >> >> Blog.BenHall.me.uk <http://blog.benhall.me.uk/>
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> >> >
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