How to match a leading_comments value with the protobuf entity it is written next to?

[Rémy Léone]

Hello,

I want to match a leading_comments value with the related protobuf entity it is written next to.
Let suppose that I got the following protobuf:

syntax = "proto3";

enum Greeting {

    NONE = 0;

    MR = 1;

    MRS = 2;

    MISS = 3;

}

// Documentation for the message

message Hello {

    // Documentation for the greeting field

    Greeting greeting = 1;

    // Documentation for the name

    string name = 2;

}

I'm using protoc and writing a short plugin that looks like this: https://gist.github.com/remyleone/54725a5be6d152a406929036512981e4

It generates a request.txt that I print:

https://gist.github.com/remyleone/ddb558e3e39f84c0b828c55cc0227b6a 

What I don't know is how to match the comments with the related protobuf entity. I'm not sure about how to use location with its span and path. Is there any helper to do the matching? Or a tutorial?

Do you know how to do this? Could I do with go?

Best regards

Rémy