lua 打印 table 拷贝table

-- 打印table
function print_lua_table (lua_table, indent)
    if lua_table == nil or type(lua_table) ~= "table" then
        return
    end

    local function print_func(str)
        XLPrint("[Dongyuxxx] " .. tostring(str))
    end
    indent = indent or 0
    for k, v in pairs(lua_table) do
        if type(k) == "string" then
            k = string.format("%q", k)
        end
        local szSuffix = ""
        if type(v) == "table" then
            szSuffix = "{"
        end
        local szPrefix = string.rep("    ", indent)
        formatting = szPrefix.."["..k.."]".." = "..szSuffix
        if type(v) == "table" then
            print_func(formatting)
            print_lua_table(v, indent + 1)
            print_func(szPrefix.."},")
        else
            local szValue = ""
            if type(v) == "string" then
                szValue = string.format("%q", v)
            else
                szValue = tostring(v)
            end
            print_func(formatting..szValue..",")
        end
    end
end

--拷贝table
function copy_table(ori_tab)
    if type(ori_tab) ~= "table" then
        return
    end
    local new_tab = {}
    for k,v in pairs(ori_tab) do
        local vtype = type(v)
        if vtype == "table" then
            new_tab[k] = copy_table(v)
        else
            new_tab[k] = v
        end
    end
    return new_tab
end

function deepcopy(object)
    local lookup_table = {}
    local function _copy(object)
        if type(object) ~= "table" then
            return object
        elseif lookup_table[object] then
            return lookup_table[object]
        end

        local new_table = {}
        lookup_table[object] = new_table
        for index, value in pairs(object) do
            new_table[_copy(index)] = _copy(value)
        end
        return setmetatable(new_table, getmetatable(object))
    end
    return _copy(object)
end

貌似deepcopy更厉害一点，找时间求证一下：

This function returns a deep copy of a given table. The function below also copies the metatable to the new table if there is one, so the behaviour of the copied table is the same as the original. But the 2 tables share the same metatable, you can avoid this by changing this ‘getmetatable(object)‘ to ‘_copy( getmetatable(object) )‘.