func mojomToVDLTypeUDT(typeKey string, udt mojom_types.UserDefinedType, mp map[string]mojom_types.UserDefinedType, builder *vdl.TypeBuilder, pendingUdts map[string]vdl.TypeOrPending) (vt vdl.TypeOrPending) {
u := interface{}(udt)
switch u := u.(type) { // To do the type switch, udt has to be converted to interface{}.
case *mojom_types.UserDefinedTypeEnumType: // enum
me := u.Value
// TODO: Assumes that the maximum enum index is len(me.Values) - 1.
labels := make([]string, len(me.Values))
for _, ev := range me.Values { // per EnumValue...
// EnumValue has DeclData, EnumTypeKey, and IntValue.
// We just need the first and last.
labels[int(ev.IntValue)] = upperCamelCase(*ev.DeclData.ShortName)
}
vt = vdl.NamedType(mojomToVdlPath(*me.DeclData.FullIdentifier), vdl.EnumType(labels...))
pendingUdts[typeKey] = vt
case *mojom_types.UserDefinedTypeStructType: // struct
vt = mojomStructToVDLType(typeKey, u.Value, mp, builder, pendingUdts)
case *mojom_types.UserDefinedTypeUnionType: // union
mu := u.Value
union := builder.Union()
vt = builder.Named(mojomToVdlPath(*mu.DeclData.FullIdentifier)).AssignBase(union)
pendingUdts[typeKey] = vt
for _, mfield := range mu.Fields {
union = union.AppendField(upperCamelCase(*mfield.DeclData.ShortName), mojomToVDLType(mfield.Type, mp, builder, pendingUdts))
}
case *mojom_types.UserDefinedTypeInterfaceType: // interface
panic("interfaces don't exist in vdl")
default: // unknown
panic(fmt.Errorf("user defined type %#v with unknown tag %d", udt, udt.Tag()))
}
return vt
}
