[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 = 0
    local content = ""
    
    local function GetSpace(level)
        local spaceStr = ""
        for i=1,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 + 1

        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 = 20
        }, 
        "asd",
    }, 
    "30", 
    {
        ["c"] = 40,
        [6] = 50,
    },
}

输出：

 

测试2(key和value都是table)：

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

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

 

输出：