[IronPython] ScriptEngine.GetRegisteredExtensions()

[Ben Hall]

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
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>> >
>> >
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