[Lua]table(一)：打印与复制

一.打印table

 function PrintTable(tb)
     if type(tb) ~= "table" then
         print(tb)
         return
     end

     local level =
     local content = ""

     local function GetSpace(level)
         local spaceStr = ""
         for i=,level do
             spaceStr = spaceStr .. "    "
         end
         return spaceStr
     end

     local function GetString(value)
         if type(value) ~= "string" then
             return tostring(value)
         else
             return "\"" .. tostring(value) .. "\""
         end
     end

     local function PrintTb(tb, level)
         level = level + 

         for k,v in pairs(tb) do
             if type(k) == "table" then
                 content = content .. "\n" .. GetSpace(level) .. "{"
                 PrintTb(k, level)
                 content = content .. "\n" .. GetSpace(level) .. "} = "
             else
                 content = content .. "\n" .. GetSpace(level) .. GetString(k) .. " = "
             end

             if type(v) == "table" then
                 content = content .. "{"
                 PrintTb(v, level)
                 content = content .. "\n" .. GetSpace(level) .. "}"
             else
                 content = content .. GetString(v)
             end
         end
     end

     PrintTb(tb, level)
     print("{" .. content .. "\n}")
 end

测试1(嵌套table)：

 local x =
 {
     {
         a = {
             b =
         },
         "asd",
     },
     "",
     {
         ["c"] = ,
         [] = ,
     },
 }

输出：

测试2(key和value都是table)：

 local a = {, [] = , ""}
 local b = {a1 = "a1"}
 local c = {}
 c[a] =
 c[b] = {b1 = }

输出：

二.复制table

 function CloneTable(tb)
     local clonedTable = {} --记录复制过的table，防止无限递归
     local function CloneTb(tb)
         if type(tb) ~= "table" then
             return tb
         elseif clonedTable[tb] then
             return clonedTable[tb]
         end

         local newTb = {}
         clonedTable[tb] = newTb
         for key,value in pairs(tb) do
             newTb[CloneTb(key)] = CloneTb(value)
         end
         return setmetatable(newTb, getmetatable(tb))
     end
     return CloneTb(tb)
 end

测试：

 local a = {, {a1 = "a1"}}
 local b = CloneTable(a)
 a[] = ""
 a[].a1 =
 b[] = ""
 PrintTable(a)
 PrintTable(b)

输出：