Schemaless protobuf text parsers.

Parse a protobuf text-format file into a dictionary. Since the parser is unaware of the schema, there are 2 keys being decoded for every field:

• key: non-repeated field version.
• Pbtxt.repeatedField(key): repeated field version (where the associated value is an array).

Example Given the pbtxt below:

layer {
  dim: 42
  [some.proto.ext]: "__"
}
model { id: "id_1" }
model { id: "id_2" }

The parsed dictionary yields:

let dict = try Pbtxt.parse(pbtxt: src)
dict["layer"] // {dim: 42, ..}
dict["model"] // {id: "node_1"}
dict[Pbtxt.repeatedField("model")] // [{id: "id_1"}, {id: "id_2"}]

Returns a value of the type you specify, decoded from a pbtxt file. Since the parser is unaware of the schema, the same consideration about repeated/non-repeated fields described above applies and must be reflected in your object CodingKeys.

An example codable object for the above described pbxt would be the following;

 struct Layer: Codable {
   enum CodingKeys: String, CodingKey {
      case dimension = "dim"
      case ext = "[some.proto.ext]"
   }
   let dimension: UInt
   let ext: String
 }

 struct Model: Codable {
   let id: String
 }

 struct Obj: Codable {
   enum CodingKeys: String, CodingKey {
     case layer = "layer"
     case models = Pbtxt.repeatedField("model")
   }
   let layer: Layer
   let models: [Model]
 }

Write a dictionary into protobuf text-format.

Encodes an object into its protobuf text-format representation.