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Lua print table(類(lèi)似PHP中的print

php中文網(wǎng)

發(fā)布： 2016-06-06 19:40:56

原創(chuàng)

1440人瀏覽過(guò)

會(huì)PHP的人都知道PHP中的print_r/var_export函數(shù)，可以方便的用于打印數(shù)組或?qū)С鲎兞?，Lua中沒(méi)有提供，實(shí)際應(yīng)用中卻是很多時(shí)候需要類(lèi)的功能。今天便封裝了個(gè)簡(jiǎn)單函數(shù)，實(shí)現(xiàn)類(lèi)功能，用來(lái)打印/導(dǎo)出table： -- dump.lua--[[dump對(duì)象@param mixed obj@return str

會(huì)php的人都知道php中的print_r/var_export函數(shù)，可以方便的用于打印數(shù)組或?qū)С鲎兞?，lua中沒(méi)有提供，實(shí)際應(yīng)用中卻是很多時(shí)候需要類(lèi)似的功能。

今天便封裝了個(gè)簡(jiǎn)單函數(shù)，實(shí)現(xiàn)類(lèi)似功能，用來(lái)打印/導(dǎo)出table：

-- dump.lua

--[[
dump對(duì)象
@param mixed obj
@return string
]]
function debug.dump(obj)
    local getIndent, quoteStr, wrapKey, wrapVal, isArray, dumpObj
    getIndent = function(level)
        return string.rep("	", level)
    end
    quoteStr = function(str)
        str = string.gsub(str, "[%c\"]", {
            ["	"] = "\t",
            ["
"] = "\r",
            ["
"] = "\n",
            ["""] = "\"",
            ["\"] = "\\",
        })
        return '"' .. str .. '"'
    end
    wrapKey = function(val)
        if type(val) == "number" then
            return "[" .. val .. "]"
        elseif type(val) == "string" then
            return "[" .. quoteStr(val) .. "]"
        else
            return "[" .. tostring(val) .. "]"
        end
    end
    wrapVal = function(val, level)
        if type(val) == "table" then
            return dumpObj(val, level)
        elseif type(val) == "number" then
            return val
        elseif type(val) == "string" then
            return quoteStr(val)
        else
            return tostring(val)
        end
    end
    local isArray = function(arr)
        local count = 0 
        for k, v in pairs(arr) do
            count = count + 1 
        end 
        for i = 1, count do
            if arr[i] == nil then
                return false
            end 
        end 
        return true, count
    end
    dumpObj = function(obj, level)
        if type(obj) ~= "table" then
            return wrapVal(obj)
        end
        level = level + 1
        local tokens = {}
        tokens[#tokens + 1] = "{"
        local ret, count = isArray(obj)
        if ret then
            for i = 1, count do
                tokens[#tokens + 1] = getIndent(level) .. wrapVal(obj[i], level) .. ","
            end
        else
            for k, v in pairs(obj) do
                tokens[#tokens + 1] = getIndent(level) .. wrapKey(k) .. " = " .. wrapVal(v, level) .. ","
            end
        end
        tokens[#tokens + 1] = getIndent(level - 1) .. "}"
        return table.concat(tokens, "
")
    end
    return dumpObj(obj, 0)
end

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測(cè)試代碼：

-- test.lua

local obj = {
    string1 = "Hi! My name is LiXianlin",
    string2 = "aa	bb
cc
dd\ee"ff",
    string3 = "a\tb\rc\n\\ee"ff",
    int = 9527,
    float = 3.1415,
    bool = true,
    array = {
        1, 2, 3,
        {
            a = 21,
            b = 22,
            c = 23,
        },
    },
    table = {
        x = 100,
        y = 200,
        w = 960,
        h = 640,
    },
    [88] = 88888,
    [9.7] = 22222,
}
print(debug.dump(obj))

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輸出結(jié)果：

{
        ["string1"] = "Hi! My name is LiXianlin",
        [9.7] = 22222,
        ["table"] = {
                ["y"] = 200,
                ["x"] = 100,
                ["h"] = 640,
                ["w"] = 960,
        },
        [88] = 88888,
        ["string2"] = "aa	bb
cc
dd\ee"ff",
        ["int"] = 9527,
        ["string3"] = "a\tb\rc\n\\ee"ff",
        ["bool"] = true,
        ["array"] = {
                1,
                2,
                3,
                {
                        ["b"] = 22,
                        ["a"] = 21,
                        ["c"] = 23,
                },
        },
        ["float"] = 3.1415,
}

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函數(shù)特點(diǎn)：

立即學(xué)習(xí)“PHP免費(fèi)學(xué)習(xí)筆記（深入）”；

1、理論上支持無(wú)限級(jí)table嵌套

2、格式化輸出，可讀性好

3、輸出結(jié)果可直接用于lua代碼

4、function、userdata、thread類(lèi)型tostring輸出

5、當(dāng)字符串中含有控制字符時(shí)，可能有影響(代碼中僅對(duì) , , 等進(jìn)行了處理)