test.pds

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

@type integer("u64")
def_native("u64");

def_native("f64");

@type binary("utf8")
def_native("sized_string") {
    argument("size", stage: "read") => integer("usize");
};

def("u8_string") => container(virtual: "true") {
    virtual_field("size", value: "string/@size") => u8;
    field("string") => sized_string(size: "../size");
};

def("position") => container {
    field("x") => ::f64;
    field("y") => ::f64;
    field("z") => ::f64;
};

def("entity_data") => container {
    field("entity_id") => ::u64;
    field("position") => ::position;
    virtual_field("entity_type_tag", value: "entity_type/@tag") => ::u8;
    field("entity_type") => union("entity_type", tag: "../entity_type_tag") {
        variant("player", match: "0") => container {};
        variant("zombie", match: "1") => container {};
    };
};

namespace("test") {
    def("ping") => container {
        field("nonce") => ::u64;
        field("timestamp") => ::u64;
    };
    @export "::test::packet"
    def("packet") => container(virtual: "true") {
        virtual_field("tag", value: "data/@tag") => ::u8;
        field("data") => union("packet_variant", tag: "../tag") {
            variant("handshake", match: "0") => container {
                field("nonce") => ::u64;
            };
            variant("ping", match: "1") => ::test::ping;
            variant("spawn_entity", match: "2") => ::entity_data;
        };
    };
};