Spike: Emit a host for Mono with static accessors for ScriptHost

[stirno]

This is really a first-stab POC on getting custom ScriptHost impls working in Mono. Goal is to crawl the passed in ScriptHost and create a class with static proxy methods/accessors that can be used by the Mono engine.

Not perfect but it does work for PVC's ScriptHost in mono. Code needs some cleanup for sure, possibly doing something horribly wrong. Thoughts? 👍

[ztone]

I did a quick test run on this PR ... nice approach to this issue.

I would have liked some more description around this PR though, examples, next steps, what is possible, what is solves etc.

[stirno]

Kind of forgot about this.. Ya, I should have added more detail. I had just talked with @khellang in JabbR about it and threw it up.

Problem: Custom ScriptHost fields/methods are unavailable when running under Mono because of the MonoHost wrapper currently being used.

This solves the issue by emitting a DynamicMonoHost that has static properties/methods for the provided ScriptHost.

Need some more people to try it out but @pvcbuild is testing this right now with our admittedly simple custom ScriptHost.

[filipw]

very good idea @stirno, very cool spike too.
I was thinking about the same thing and the static requirement is really a difficult hurdle to clear and unfortunately emitting code might be the only way to go.

Here are my suggestions:

• leave the original static wrapper as it's fast, the builder logic should only kick in when the host's identity is not an instance of ScriptHost
• add tests - this looks very fragile so it definitely needs proper unit tests
• the code should probably be changed to work against IScriptHost rather than the base class, since we only require the interface implementation
• host can rely on private methods too which are not being emitted here. The non-backing fields should be taken into account as well

[stirno]

Hey guys, sorry for leaving this hanging. @khellang and I just wanted to get the conversation started on the potential solution. Agreed it needs good tests. Trying to find some time to spend on this. Hopefully this weekend.

[glennblock]

@stirno I am closing this as it has not had any progress in 2 years.