lua proxy demo

lua_proxy_demo.lua

proxy = {}

proxy.wrap = function(t)
        return proxy.wraphelper(t, nil, nil)
end

proxy.wraphelper = function(t, pm, path2me)
        -- print("wraphelper", t, pm, path2me)
        local m = {}
        m.__path = path2me
        m.__parent = pm
        m.__newindex = function(_, k, v)
                local old = t[k]
                -- print("set", "path", path, "old", old, "new", v)
                -- trace new table
                local wv = v
                if old == nil and type(v) == "table" then
                        wv = proxy.wraphelper(v, m, k)
                end
                local path = tostring(k)
       		if m.__parent ~= nil then
                        path = path .. "<="
                        path = path .. tostring(m.__path)
       		end
                local parent = m.__parent
                while parent ~= nil and parent.__path ~= nil do
                        path = path .. "<="
                        path = path .. tostring(parent.__path)
                        parent = parent.__parent
                end
                print("set", "*", path, "*", k, "old", old, "new", v)
                t[k] = wv
        end

        m.__index = function(_, k)
                return t[k]
        end
        p = {}
        setmetatable(p, m)
        return p
end

t1 = proxy.wrap({})
t1.backpack = {}
t1.backpack[1] = {id=1, power=100}
t1.backpack[1].power = 101
print(t1.backpack[1].power)
t1.mailbox = {}
table.insert(t1.mailbox, {})
t1.mailbox[1].mail_id = 1
t1.mailbox[1].content = "foo"