github.com/jhump/protoreflect@v1.16.0/desc/protoprint/testfiles/desc_test_comments-default.proto

// This is the first detached comment for the syntax.

// This is a second detached comment.

// This is a third.

// Syntax comment...
syntax = "proto2"; // Syntax trailer.

// And now the package declaration
package foo.bar;

// option comments FTW!!!
option go_package = "github.com/jhump/protoreflect/internal/testprotos";

import public "google/protobuf/empty.proto";

import "desc_test_options.proto";

// Multiple white space lines (like above) cannot
// be preserved...

// We need a request for our RPC service below.
message Request {
  option deprecated = true; // deprecated!

  // A field comment
  repeated int32 ids = 1 [
    packed = true,
    json_name = "|foo|",
    (testprotos.ffubar) = "abc",
    (testprotos.ffubarb) = "xyz"
  ]; // field trailer #1...

  // lead mfubar
  option (testprotos.mfubar) = true; // trailing mfubar

  // some detached comments

  // some detached comments with unicode 这个是值

  // Another field comment

  // label comment
  optional string name = 2 [default = "fubar"];

  extensions 100 to 200;

  extensions 201 to 250 [
    (testprotos.exfubarb) = "\000\001\002\003\004\005\006\007",
    (testprotos.exfubar) = "splat!"
  ];

  reserved 10 to 20, 30 to 50;

  reserved "foo", "bar", "baz";

  // Group comment with emoji 😀 😍 👻 ❤ 💯 💥 🐶 🦂 🥑 🍻 🌍 🚕 🪐
  optional group Extras = 3 {
    // trailer for Extras

    // this is a custom option
    option (testprotos.mfubar) = false;

    optional double dbl = 1;

    optional float flt = 2;

    option no_standard_descriptor_accessor = false;

    // Leading comment...
    optional string str = 3; // Trailing comment...
  }

  enum MarioCharacters {
    // trailer for enum

    // allow_alias comments!
    option allow_alias = true;

    MARIO = 1 [
      (testprotos.evfubars) = -314,
      (testprotos.evfubar) = 278
    ];

    LUIGI = 2 [
      (testprotos.evfubaruf) = 100,
      (testprotos.evfubaru) = 200
    ];

    PEACH = 3;

    BOWSER = 4;

    option (testprotos.efubars) = -321;

    WARIO = 5;

    WALUIGI = 6;

    SHY_GUY = 7 [(testprotos.evfubarsf) = 10101];

    HEY_HO = 7;

    MAGIKOOPA = 8;

    KAMEK = 8;

    SNIFIT = -101;

    option (testprotos.efubar) = 123;
  }

  // can be this or that
  oneof abc {
    // trailer for oneof abc

    string this = 4;

    int32 that = 5;
  }

  // can be these or those
  oneof xyz {
    // whoops?
    option (testprotos.oofubar) = "whoops, this has invalid UTF8! \274\377";

    string these = 6;

    int32 those = 7;
  }

  // map field
  map<string, string> things = 8;
}

// And next we'll need some extensions...

extend Request {
  // trailer for extend block

  // comment for guid1
  optional uint64 guid1 = 123;

  // ... and a comment for guid2
  optional uint64 guid2 = 124;
}

message AnEmptyMessage {
}

// Service comment
service RpcService {
  // service trailer
  // that spans multiple lines

  // option that sets field
  option (testprotos.sfubar) = { id: 100, name: "bob" };

  option deprecated = false; // DEPRECATED!

  option (testprotos.sfubare) = VALUE;

  // Method comment
  rpc StreamingRpc ( stream Request ) returns ( Request ); // compact method trailer

  rpc UnaryRpc ( Request ) returns ( google.protobuf.Empty ) {
    // trailer for method

    // this RPC is deprecated!
    option deprecated = true;

    option (testprotos.mtfubar) = 12.340000;

    option (testprotos.mtfubard) = 123.456000;
  }
}