[protobuf] [ANN] Package in Go for parsing .proto(3)

[Yohei Yoshimuta]

go-protoparser parses the proto3 
<https://developers.google.com/protocol-buffers/docs/reference/proto3-spec>
 file.

- https://github.com/yoheimuta/go-protoparser
- You can use it if you know one Parse function.

----

A Protocol Buffer file versioned 3 which is an example of the official 
reference.

syntax = "proto3";
// An example of the official reference
// See 
https://developers.google.com/protocol-buffers/docs/reference/proto3-spec#proto_file
package examplepb;
import public "other.proto";
option java_package = "com.example.foo";
enum EnumAllowingAlias {
   option allow_alias = true;
   UNKNOWN = 0;
   STARTED = 1;
   RUNNING = 2 [(custom_option) = "hello world"];
}
message outer {
   option (my_option).a = true;
   message inner {   // Level 2
       int64 ival = 1;
   }
   repeated inner inner_message = 2;
   EnumAllowingAlias enum_field =3;
   map<int32, string> my_map = 4;
}


The Parsed result is a Go typed struct. The below output is encoded to JSON 
for simplicity.

{
 "Syntax": {
   "ProtobufVersion": "proto3",
   "Comments": null
 },
 "ProtoBody": [
   {
     "Name": "examplepb",
     "Comments": [
       {
         "Raw": "// An example of the official reference"
       },
       {
         "Raw": "// See 
https://developers.google.com/protocol-buffers/docs/reference/proto3-spec#proto_file";
       }
     ]
   },
   {
     "Modifier": 1,
     "Location": "\"other.proto\"",
     "Comments": null
   },
   {
     "OptionName": "java_package",
     "Constant": "\"com.example.foo\"",
     "Comments": null
   },
   {
     "EnumName": "EnumAllowingAlias",
     "EnumBody": [
       {
         "OptionName": "allow_alias",
         "Constant": "true",
         "Comments": null
       },
       {
         "Ident": "UNKNOWN",
         "Number": "0",
         "EnumValueOptions": null,
         "Comments": null
       },
       {
         "Ident": "STARTED",
         "Number": "1",
         "EnumValueOptions": null,
         "Comments": null
       },
       {
         "Ident": "RUNNING",
         "Number": "2",
         "EnumValueOptions": [
           {
             "OptionName": "(custom_option)",
             "Constant": "\"hello world\""
           }
         ],
         "Comments": null
       }
     ],
     "Comments": null
   },
   {
     "MessageName": "outer",
     "MessageBody": [
       {
         "OptionName": "(my_option).a",
         "Constant": "true",
         "Comments": null
       },
       {
         "MessageName": "inner",
         "MessageBody": [
           {
             "IsRepeated": false,
             "Type": "int64",
             "FieldName": "ival",
             "FieldNumber": "1",
             "FieldOptions": null,
             "Comments": [
               {
                 "Raw": "// Level 2"
               }
             ]
           }
         ],
         "Comments": null
       },
       {
         "IsRepeated": true,
         "Type": "inner",
         "FieldName": "inner_message",
         "FieldNumber": "2",
         "FieldOptions": null,
         "Comments": null
       },
       {
         "IsRepeated": false,
         "Type": "EnumAllowingAlias",
         "FieldName": "enum_field",
         "FieldNumber": "3",
         "FieldOptions": null,
         "Comments": null
       },
       {
         "KeyType": "int32",
         "Type": "string",
         "MapName": "my_map",
         "FieldNumber": "4",
         "FieldOptions": null,
         "Comments": null
       }
     ],
     "Comments": null
   }
 ]
}

MIT License. Contributions and feedbacks welcome.

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