// Protocol Buffers - Google's data interchange format
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// https://developers.google.com/protocol-buffers/
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edition = "2023";

package rust_unittest_proto3_optional;

option java_multiple_files = true;
option java_package = "com.google.protobuf.testing.proto";

message TestProto3Optional {
  message NestedMessage {
    // The field name "b" fails to compile in proto1 because it conflicts with
    // a local variable named "b" in one of the generated methods.  Doh.
    // This file needs to compile in proto1 to test backwards-compatibility.
    int32 bb = 1;
  }

  enum NestedEnum {
    UNSPECIFIED = 0;
    FOO = 1;
    BAR = 2;
    BAZ = 3;
    NEG = -1;  // Intentionally negative.
  }

  // Singular
  int32 optional_int32 = 1;
  int64 optional_int64 = 2;
  uint32 optional_uint32 = 3;
  uint64 optional_uint64 = 4;
  sint32 optional_sint32 = 5;
  sint64 optional_sint64 = 6;
  fixed32 optional_fixed32 = 7;
  fixed64 optional_fixed64 = 8;
  sfixed32 optional_sfixed32 = 9;
  sfixed64 optional_sfixed64 = 10;
  float optional_float = 11;
  double optional_double = 12;
  bool optional_bool = 13;
  string optional_string = 14;
  bytes optional_bytes = 15;
  string optional_cord = 16 [ctype = CORD];

  NestedMessage optional_nested_message = 18;
  NestedMessage lazy_nested_message = 19 [lazy = true];

  NestedEnum optional_nested_enum = 21;

  // Add some non-optional fields to verify we can mix them.
  int32 singular_int32 = 22 [features.field_presence = IMPLICIT];

  int64 singular_int64 = 23 [features.field_presence = IMPLICIT];
}

message TestProto3OptionalMessage {
  message NestedMessage {
    string s = 1 [features.field_presence = IMPLICIT];
  }

  NestedMessage nested_message = 1;
  NestedMessage optional_nested_message = 2;
}