input.json

{
  "types": {
    "u8": ["native", {
      "type": "integer"
    }],
    "test": ["container", {
      "virtual": true,
      "fields": [
        {
          "name": "tag",
          "type": "virtual",
          "ref": "data",
          "prop": "tag",
          "type": "u8"
        },
        {
          "name": "data",
          "type": ["union", {
            "name": "test_union",
            "ref": "../tag",
            "variants": [
              {
                "name": "zero",
                "match": "0",
                "type": "u8"
              },
              {
                "name": "one",
                "match": "1",
                "type": ["container", {
                  "virtual": false,
                  "fields": [
                    {
                      "name": "woo",
                      "type": "u8"
                    },
                    {
                      "name": "hoo",
                      "type": "u8"
                    }
                  ]
                }]
              }
            ]
          }]
        }
      ]
    }]
  }
}

input.pds

@type "integer"
def_native("u8");

def("test") => container(virtual: "true") {
    virtual_field("tag", ref: "data", prop: "tag") => u8;
    field("data") => union("test_union", ref: "../tag") {
        variant("zero", match: "0") => u8;
        variant("one", match: "1") => container {
            field("woo") => u8;
            field("hoo") => u8;
        };
    };
};

output.js

var type_1_size_of = types["::u8"]["size_of"];
var type_1_serialize = types["::u8"]["serialize"];
var type_1_deserialize = types["::u8"]["deserialize"];
function type_2_size_of(input) {
    let count = 0;
    let type_input_0 = input;
    {
        var type_input_1 = type_input_0;
        switch (type_input_1.tag) {
            case "zero": {
                var type_input_1 = 0;
                break;
            }
            case "one": {
                var type_input_1 = 1;
                break;
            }
        }
        {
            var size = type_1_size_of(type_input_1);
            count = count + size;
        }
        var type_input_2 = type_input_0;
        {
            switch (type_input_2.tag) {
                case "zero": {
                    var type_input_3 = type_input_2.data;
                    {
                        var size = type_1_size_of(type_input_3);
                        count = count + size;
                    }
                    break;
                }
                case "one": {
                    var type_input_4 = type_input_2.data;
                    {
                        var type_input_5 = type_input_4["woo"];
                        {
                            var size = type_1_size_of(type_input_5);
                            count = count + size;
                        }
                        var type_input_6 = type_input_4["hoo"];
                        {
                            var size = type_1_size_of(type_input_6);
                            count = count + size;
                        }
                    }
                    break;
                }
            }
        }
    }
    return count;
}
function type_2_serialize(input, buffer, offset) {
    let type_input_0 = input;
    {
        var type_input_1 = type_input_0;
        switch (type_input_1.tag) {
            case "zero": {
                var type_input_1 = 0;
                break;
            }
            case "one": {
                var type_input_1 = 1;
                break;
            }
        }
        {
            var offset = type_1_serialize(type_input_1, buffer, offset);
        }
        var type_input_2 = type_input_0;
        {
            switch (type_input_2.tag) {
                case "zero": {
                    var type_input_3 = type_input_2.data;
                    {
                        var offset = type_1_serialize(type_input_3, buffer, offset);
                    }
                    break;
                }
                case "one": {
                    var type_input_4 = type_input_2.data;
                    {
                        var type_input_5 = type_input_4["woo"];
                        {
                            var offset = type_1_serialize(type_input_5, buffer, offset);
                        }
                        var type_input_6 = type_input_4["hoo"];
                        {
                            var offset = type_1_serialize(type_input_6, buffer, offset);
                        }
                    }
                    break;
                }
            }
        }
    }
    return offset;
}
function type_2_deserialize(buffer, offset) {
    {
        {
            var [type_output_1, offset] = type_1_deserialize(buffer, offset);
        }
        {
            switch (type_output_1) {
                case 0: {
                    {
                        var [type_output_3, offset] = type_1_deserialize(buffer, offset);
                    }
                    var type_output_2 = { tag: "zero", data: type_output_3 };
                    break;
                }
                case 1: {
                    {
                        {
                            var [type_output_5, offset] = type_1_deserialize(buffer, offset);
                        }
                        {
                            var [type_output_6, offset] = type_1_deserialize(buffer, offset);
                        }
                        var type_output_4 = { woo: type_output_5, hoo: type_output_6 };
                    }
                    var type_output_2 = { tag: "one", data: type_output_4 };
                    break;
                }
            }
        }
        var type_output_0 = type_output_2;
    }
    return [type_output_0, offset];
}
var exports = {
"::u8": {"size_of": type_1_size_of, "serialize": type_1_serialize, "deserialize": type_1_deserialize },
"::test": {"size_of": type_2_size_of, "serialize": type_2_serialize, "deserialize": type_2_deserialize }
};