modlib/minetest/luon.lua

-- Localize globals
local getmetatable, AreaStore, ItemStack
    = getmetatable, AreaStore, ItemStack

-- Metatable lookup for classes specified in lua_api.txt, section "Class reference"
local AreaStoreMT = getmetatable(AreaStore())
local ItemStackMT = getmetatable(ItemStack"")
local metatables = {
    [AreaStoreMT] = {name = "AreaStore", method = AreaStoreMT.to_string},
    [ItemStackMT] = {name = "ItemStack", method = ItemStackMT.to_table},
    -- TODO expand
}

(...).luon = modlib.luon.new{
    aux_write = function(_, value)
        local type = metatables[getmetatable(value)]
        if type then
            return type.name, type.method(value)
        end
    end,
    aux_read = {
        AreaStore = function(...)
            local store = AreaStore()
            store:from_string(...)
            return store
        end,
        ItemStack = ItemStack
    }
}