[marktangotango]

I'm curious how this works under the hood, looks like it's added as an annotation processor, and the DSL is embedded in specially formatted comments, but not in annotations. This implies to me the annotation processor is processing the comments in a source file? I did not know annotation processors could do this! Also implies comments carry through to the compiled .class files which I did not think they did either (runtime bytedcode weaving)?

[mckinney]

Hi, you can blame me for this. It's a Java compiler plugin[1], which is similar to an annotation processor, but can hook into the compiler at a much earlier stage, which allows it to contribute to all phases of the compiler, including the Parser phase. The Manifold plugin takes full advantage of this, hence its ability to analyze comments, contribute to bytecode generation, etc.

[1] https://docs.oracle.com/javase/8/docs/jdk/api/javac/tree/com...

[teslalang]

Amazing! Reading the posted link this looks much bigger than embedding, which is crazy impressive btw. Do you anticipate building support for more resources? I notice you have GraphQL support... what about SQL?

[eatonphil]

So you have a javascript frontend hooked into the java compiler? Or how does your javascript integration work?

[mckinney]

At compile-time manifold-js[1] parses JS and generates Java types (stubs), which forward execution to rhino at runtime. Basically, JS seamlessly mapped onto Java's type system.

[1] https://github.com/manifold-systems/manifold/tree/master/man...