Notes on the serialization of LUA programming objects

AboutLUAProgram DesignObject serializationLearning notes are the content to be introduced in this article.LUAMediumObjectOfSerializationFor details, refer to this article.

We usually need to serialize some data, that is, to convert the data into a byte stream or a bytes stream, and then we can easily persist it. There are many formats available for text serialization: SOAP, Json, and even custom xml. However, lua script is also a good choice.

For more information, see 《LuaProgramming version 2nd) "Simplified Chinese version detailed LUA script language data files and persistence based on the Implementation below. Note that this implementation can only target non-circular tables and Cannot serialize or deserialize functions, threads, and userdata. In order to prevent the serialized data from being too large, there is no detailed typographical control.

 
 

  
  
function serialize(obj)  
  
  
    local lua = "" 
  
  
    local t = type(obj)  
  
  
    if t == "number" then  
  
  
        lualua = lua .. obj  
  
  
    elseif t == "boolean" then  
  
  
        lualua = lua .. tostring(obj)  
  
  
    elseif t == "string" then  
  
  
        lualua = lua .. string.format("%q", obj)  
  
  
    elseif t == "table" then  
  
  
        lualua = lua .. "{\n"  
  
  
        for k, v in pairs(obj) do  
  
  
            lualua = lua .. "[" .. serialize(k) .. "]=" .. serialize(v) .. ",\n"  
  
  
        end  
  
  
        local metatable = getmetatable(obj)  
  
  
        if metatable ~= nil and type(metatable.__index) == "table" then  
  
  
            for k, v in pairs(metatable.__index) do  
  
  
                lualua = lua .. "[" .. serialize(k) .. "]=" .. serialize(v) .. ",\n"  
  
  
            end  
  
  
        end  
  
  
        lualua = lua .. "}"  
  
  
    elseif t == "nil" then  
  
  
        return nil  
  
  
    else  
  
  
        error("can not serialize a " .. t .. " type.")  
  
  
    end  
  
  
    return lua  
  
  
end  
  
  
 
  
  
function unserialize(lua)  
  
  
    local t = type(lua)  
  
  
    if t == "nil" or lua == "" then  
  
  
        return nil  
  
  
    elseif t == "number" or t == "string" or t == "boolean" then  
  
  
        lua = tostring(lua)  
  
  
    else  
  
  
        error("can not unserialize a " .. t .. " type.")  
  
  
    end  
  
  
    lua = "return " .. lua  
  
  
    local func = loadstring(lua)  
  
  
    if func == nil then return nil end  
  
  
    return func()  
  
  
end  
  
  
 
  
  
data = {["a"] = "a", ["b"] = "b", [1] = 1, [2] = 2, ["t"] = {1, 2, 3}}  
  
  
print(serialize(unserialize(1)))  
  
  
print(serialize(unserialize(serialize(data)))) 
 
 

Summary: AboutLUAProgram DesignObject serializationThe content of the study notes has been introduced. I hope this article will help you!