Parse .proto files

[Ran Volkovich]

Hi, 

There is a way to transform .proto file like 

syntax = "proto3";

package helloworld;

// My cool new message.
message MyMessage {
string some_string = 1;
repeated int64 some_numbers = 2;
}

to FileDescriptorProto class from com.google.protobuf jar (or any other proto lib that can represent the proto schema)
without to use protoc to generate descriptor before?

[Marc Gravell]

If .NET is an option, protobuf-net has this (in the protobuf-net.Reflection package):

var schema = """

    syntax = "proto3";

    package helloworld;

    // My cool new message

    message MyMessage {
      string some_string = 1;
      repeated int64 some_numbers = 2;
    }

    """;
var set = new FileDescriptorSet();
set.Add("some.proto", source: new StringReader(schema));
set.Process();

foreach (var file in set.Files)
{
    Console.WriteLine($"in {file.Name}");
    foreach (var msg in file.MessageTypes)
    {
        Console.WriteLine(msg.Name);
        foreach (var field in msg.Fields)
        {
            Console.WriteLine($"> {field.Name}");
        }
    }
    Console.WriteLine();
}

This is entirely managed code (i.e. no "shell to protoc"). The API is basically identical to the Google one - the idea is that the type system is binary compatible (i.e. you can serialize it as protobuf and you'd get the same thing that protoc would give, in binary mode)

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Regards,

Marc

[Ran Volkovich]

Hi, 

thanks for the the answer.

this is great if i wont find any scala/java lib that does this i might use it thanks 

[Gary Peck]

It's not Java/Scala, but another option is buf's proto parser written in Go: https://github.com/bufbuild/protocompile.

Gary

[Ran Volkovich]

thanks ill take a look also on that