Scala protocol buffers compiler

Question

I was thinking about writing a code generator to generate scala from google protobuf definitions file. The reason I see it valuable is the java bindings are too Java-ish and one could do much better in scala. For example for the following definition

message Foo {
  required int F1 = 1;
  repeated string F2 = 2;
  message Inner (
    required int F3 = 1;
  )
}

I want to be able to construct the proto object from Scala like this:

val foo = Foo (
  F1(127),
  F2("first", "second"),
  Inner (
    F3(911)
  )
)

My question is if anyone knows something along these lines already existing, or if not do you find it worthy to start a new project?

Answer 1

I'm currently working on a Scala Protocol Buffers compiler with my mentor Viktor Klang. It's my Google Summer of Code project and you can follow the progress on github at https://github.com/SandroGrzicic/ScalaBuff.

[Update] The main part is complete; I still need to implement Extensions, Groups and field Options support. It's usable and I invite everyone to try it and give feedback; I'm open to suggestions and feature requests.

Answer 2

I just came across these but can not vouch for them as I've never used them.

http://code.google.com/p/protobuf-scala/

https://github.com/jeffplaisance/scala-protobuf