-- 不能使用 debug 命名模块，会冲突，
-- 要使用其余名字比如 Debug
local debug = {} 
io.stdout:setvbuf("no")

debug.LEVEL = {
	INFO = 4, 
	DEBUG = 3, 
	WARN = 2, 
	ERROR = 1, 
	NONE = 0
} 

debug.level = debug.LEVEL.INFO

debug.strict = function(level)
	debug.level = level
end 	

debug.log = function(level, fmt, ...)
	if level <= debug.level then 
		local msg = string.format(fmt, ...)
		print(msg)
	end 
end 

return debug