Re: A tricky way to determine Lua version
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- Subject: Re: A tricky way to determine Lua version
- From: Sean Conner <sean@...>
- Date: 2016年5月21日 03:42:15 -0400
It was thus said that the Great Ulrich Schmidt once stated:
>
> Am 21.05.2016 um 09:13 schrieb Sean Conner:
> >It was thus said that the Great Vadim A. Misbakh-Soloviov once stated:
> >>> Mine relies upon strings still having a metatable.
> >>But lacks luajit ;)
> >
> > Nah. If version is nil, it's LuaJIT.
> >
> > -spc (nil can't be a table key, see ... )
>
> Thats all true. I still like Egors version because it is simple to use.
> (without nil tests.) and the results can be changed eg.
>
> function needs_setfenv()
> local f, t = function() return function() end end, {nil,
> [false] = true, --'5.1',
> [true] = false, --'5.2',
> [1/'-0'] = false, --'5.3',
> [1] = true, --'JIT'
> }
> return t[1] or t[1/0] or t[f()==f()];
> end;
Hmm ... okay, how about:
local version = ({Q="Lua 5.1",R="Lua 5.2",S="Lua 5.3"})[
("").dump(function() end):sub(5,5)] or "LuaJIT"
And you can change it just as easily:
local version = ({Q=true,R=false,S=false})[
("").dump(function() end):sub(5,5)] or true
-spc (Okay, so a few comments might be nice ... 8-)