CODEWITHSUNDEEP
scalaprotocol-buffers
venechka
venechka

Reputation: 1234

Scala protocol buffers compiler

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?

Upvotes: 18

Views: 7547

Answers (5)

Viktor Klang
Viktor Klang

Reputation: 26589

There's this project that uses Simple-Build-Tool plugins to achieve that effect: http://github.com/codahale/protobuf-sbt?locale=sv

Update: The above project no longer exists. The sbt-protobuf plugin extended the functionality of that original project. Note, however, that sbt-protobuf generates Java classes, not Scala.

Upvotes: 1

marios
marios

Reputation: 8996

A really good tool to generate both Scala and Java classes from .proto files is ScalaPB. The tool extends the functionality of the sbt-protobuf plugin.

Upvotes: 1

Sandro Gržičić
Sandro Gržičić

Reputation: 313

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.

Upvotes: 14

stevie el
stevie el

Reputation: 76

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

Upvotes: 1

Magnus
Magnus

Reputation: 1154

Maybe it would be possible to write a Scala compiler plugin that read and compiled .proto files?

Upvotes: 0

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