[Lua]table(一)：打印与复制

一.打印table

 1 function PrintTable(tb)
 2     if type(tb) ~= "table" then
 3         print(tb)
 4         return
 5     end
 6     
 7     local level = 0
 8     local content = ""
 9     
10     local function GetSpace(level)
11         local spaceStr = ""
12         for i=1,level do
13             spaceStr = spaceStr .. "    "
14         end
15         return spaceStr
16     end
17     
18     local function GetString(value)
19         if type(value) ~= "string" then
20             return tostring(value)
21         else
22             return "\"" .. tostring(value) .. "\""
23         end
24     end
25     
26     local function PrintTb(tb, level)
27         level = level + 1
28 
29         for k,v in pairs(tb) do
30             if type(k) == "table" then
31                 content = content .. "\n" .. GetSpace(level) .. "{"
32                 PrintTb(k, level)
33                 content = content .. "\n" .. GetSpace(level) .. "} = "
34             else
35                 content = content .. "\n" .. GetSpace(level) .. GetString(k) .. " = "
36             end
37             
38             if type(v) == "table" then
39                 content = content .. "{"
40                 PrintTb(v, level)
41                 content = content .. "\n" .. GetSpace(level) .. "}"
42             else
43                 content = content .. GetString(v)
44             end
45         end
46     end
47 
48     PrintTb(tb, level)
49     print("{" .. content .. "\n}")
50 end

测试1(嵌套table)：

 1 local x = 
 2 {
 3     {
 4         a = {
 5             b = 20
 6         }, 
 7         "asd",
 8     }, 
 9     "30", 
10     {
11         ["c"] = 40,
12         [6] = 50,
13     },
14 }

输出：

测试2(key和value都是table)：

1 local a = {10, [15] = 20, "30"}
2 local b = {a1 = "a1"}
3 local c = {}
4 c[a] = 2
5 c[b] = {b1 = 50}

输出：

二.复制table

 1 function CloneTable(tb)
 2     local clonedTable = {} --记录复制过的table，防止无限递归
 3     local function CloneTb(tb)
 4         if type(tb) ~= "table" then
 5             return tb
 6         elseif clonedTable[tb] then
 7             return clonedTable[tb]
 8         end
 9         
10         local newTb = {}
11         clonedTable[tb] = newTb
12         for key,value in pairs(tb) do
13             newTb[CloneTb(key)] = CloneTb(value)
14         end
15         return setmetatable(newTb, getmetatable(tb))
16     end
17     return CloneTb(tb)
18 end

测试：

1 local a = {10, {a1 = "a1"}}
2 local b = CloneTable(a)
3 a[1] = "123"
4 a[2].a1 = 20
5 b[1] = "456"
6 PrintTable(a)
7 PrintTable(b)

输出：

[Lua]table(一)：打印与复制

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