(编辑：jimmy 日期: 2024/12/25 浏览：2)
ltemplate.lua
local insert = table.insert
local remove = table.remove
local concat = table.concat
local format = string.format
local loaded = {}
local partten = "(.-){#([^#].-[^#])#}()"
local content = {}
local cur_content = nil
local function ob_start()
cur_content = {}
insert(content, cur_content)
end
local function ob_get_clean()
local ret = concat(cur_content)
remove(content)
cur_content = content[#content]
return ret
end
local function echo(value)
insert(cur_content, value)
end
local function include(path, params)
local bitcode = loaded[path]
if not bitcode then
local fp = io.open(path, "rb")
local template = fp:read('*a')
fp:close()
local results = {}
local last_endpos = 0
for outside, inside, endpos in template:gmatch(partten) do
insert(results, format("echo(%q)", outside))
insert(results, inside)
last_endpos = endpos
end
insert(results, format("echo(%q)", template:sub(last_endpos)))
results = concat(results, "\n")
bitcode = assert(loadstring(results))
loaded[path] = bitcode
end
local env = {
include = include,
echo = echo,
ob_start = ob_start,
ob_get_clean = ob_get_clean
}
setmetatable(env, {__index = function(tb, k)
return params[k] or _G[k]
end})
setfenv(bitcode, env)
bitcode()
end
for i = 1, 100000 do
ob_start()
include(arg[1], {
params = {
a = '1234',
b = '4321'
}
})
ob_get_clean()
end
master.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html lang='zh-CN' xml:lang='zh-CN' xmlns='http://www.w3.org/1999/xhtml'> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> <meta http-equiv="Content-Language" content="zh-CN"/> <meta name="robots" content="index, follow" /> <link rel="shortcut icon" type="image/x-icon" href="/img/favicon.ico" /> <title> child's personal page - 开源中国社区</title> <link rel="stylesheet/less" href="http://my.oschina.net/lostchild/styles.less" type="text/css" media="screen" /> <link rel="stylesheet" href="/js/2012/poshytip/tip-yellowsimple/tip-yellowsimple.css" type="text/css" /> <link rel="stylesheet" type="text/css" href="/js/2011/fancybox/jquery.fancybox-1.3.4.css" media="screen" /> <script type="text/javascript" src="/UploadFiles/2021-04-08/jquery-1.7.1.min.js">temp.html，继承master.html
{# ob_start() #} <script> alert("hello World") </script> {# local header = ob_get_clean() #} {# ob_start() #} <table> {# for k, v in pairs(params) do #} <tr> <td>{# echo(k) #}</td> <td>{# echo(v) #}</td> </tr> {# end #} </table> {# local content = ob_get_clean() #} {# include('master.html', {header = header, content = content}) #}循环十万次测试渲染速度（阿里云最便宜一款vps）
[root@AY130801221248587d02Z ~]# time lua ltemplate.lua temp.htmlreal 0m1.867suser 0m1.862s sys 0m0.004s总结
由此可见渲染的速度还是非常快的，可以将此原型用于嵌入式设备中的页面上（用大量js实现的嵌入式设备页面兼容性不好）。而且嵌入式设备的界面需要简单明确，所以也不用太丰富的模版功能。
原理很简单：
1.用lua版的正则把模版内{#与#}之间的内容挖出来，原样输出成lua代码，其它部分则生成使用echo打印到某个缓冲区的lua代码。
2.将这个生成出来的代码使用loadstring编译。
3.通过setfenv实现loadstring后的模拟环境配置（用以提供模版内使用的echo，ob_start等函数，以及传入的参数）
4.执行这个编译后的函数即可。