Re: A tricky way to determine Lua version
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- Subject: Re: A tricky way to determine Lua version
- From: Thijs Schreijer <thijs@...>
- Date: 2018年6月29日 10:32:41 +0000
> On 29 Jun 2018, at 01:58, Coda Highland <chighland@gmail.com> wrote:
>
> On Thu, Jun 28, 2018 at 2:37 PM, Egor Skriptunoff
> <egor.skriptunoff@gmail.com> wrote:
>>
>>
>> On Sat, May 21, 2016 at 8:18 AM, Egor Skriptunoff wrote:
>>>
>>>
>>> simple program that determines Lua version.
>>>
>>> local f, t = function()return function()end end, {nil,
>>> [false] = 'Lua 5.1',
>>> [true] = 'Lua 5.2',
>>> [1/'-0'] = 'Lua 5.3',
>>> [1] = 'LuaJIT' }
>>> local version = t[1] or t[1/0] or t[f()==f()]
>>>
>>> The curious fact about this program is that it doesn't depend on anything
>>> that can be changed.
>>
>>
>>
>> Here is an update of Lua version detector.
>> Support for 5.0 and 5.4 was added.
>>
>> --[=[
>> local version = 'Lua 5.0'
>> --[[]=]
>> local n = '8'; repeat n = n*n until n == n*n
>> local t = {'Lua 5.1', nil,
>> [-1/0] = 'Lua 5.2',
>> [1/0] = 'Lua 5.3',
>> [2] = 'LuaJIT'}
>> local version = t[2] or t[#'\z'] or t[n/'-0'] or 'Lua 5.4'
>> --]]
>>
>
> Useful, but sadly this doesn't help distinguish between patch levels.
>
> /s/ Adam
>
It also misses detection of LuaJIT’s 5.2 compatibility flag
Thijs