swift-protobuf/Protos/unittest_swift_extension.proto

// Protos/unittest_swift_extension.proto - test proto
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
// -----------------------------------------------------------------------------
///
/// Test handling of extensions to deeply nested messages.
///
// -----------------------------------------------------------------------------

syntax = "proto2";

package protobuf_unittest.extend;

message Foo {
    message Bar {
        message Baz {
            optional int32 a = 1;
            extensions 100 to 1000;
        }
    }
}

extend Foo.Bar.Baz {
   optional string b = 100;
   optional group C = 101 {
      optional int64 c = 999;
//      extensions 10 to 20;
   }
}

/*
extend Foo.Bar.Baz.C {
   optional bool d = 12;
}
*/