in loadlib.c:
/* check whether table already has a _NAME field */
lua_getfield(L, -1, "_NAME");
if (!lua_isnil(L, -1)) /* is table an initialized module? */
lua_pop(L, 1);
else { /* no; initialize it */
lua_pop(L, 1);
modinit(L, modname);
}
So, if the module did not set _NAME, lua will help the module to do that.
At 2014年09月24日 22:48:28, "Peng Zhicheng" <pengzhicheng1986@gmail.com> wrote:
>On 09/22/2014 08:22 PM, zzf wrote:
>>
>> in lua module
>> if _NAME == nil then
>> test()
>> end
>> equals
>> if __name__ == “__main__”:
>>
>> like this:
>>
>> Lua 5.1.4 Copyright (C) 1994-2008 Lua.org, PUC-Rio
>> > require('md5')
>> > print(md5._NAME)
>> md5
>> >
>>
>No, you have taken it wrong -- the _NAME field of the module is set by the module itself, not by Lua.
>if the module does not set it, it won't be there.
>
>if you check your md5.lua, you would probably see something like this:
>
>~~~
>module("md5", package.seeall)
>_NAME = "md5"
>_VERSION = <...>
>_COPYRIGHT = <...>
><...>
>~~~
>
>
>
>