[JW Lua] v0.67/Lua 5.4 report from Perfect Layout - incompatibillity with NaN

[Jan Angermüller]

To have it all in one mail, here are more differences between 5.2/5.4 
regarding infinity and not-a-number (NaN).

print(0/0,    1/0,    math.huge,   tostring(0/0),   tostring(1/0)  )

JW Lua 5.2 prints:
-1.#IND    1.#INF     1.#INF     -1.#IND     1.#INF

RGP Lua 5.4/ZeroBrand Studio prints:
0/0    1/0 --[[math.huge]]    1/0 --[[math.huge]]    "-nan(ind)" "inf"

The following code shows the difference:
local a=0/0
local b=0/0
local i
for i=a,b,1 do
     print("In the Loop")
end

While in Lua 5.2 the loop is never entered, in Lua 5.4 it is entered 
with i=0/0.
And if in the loop an array with index i is accessed, of course Lua 5.4 
throws an error.

Ok, I must admit, I had not expected this scenario in my code because of 
a phenomenon that I wasn't aware of:
print(math.pow(-27,1/3))
While this is obviously -3, Lua returns: -1.#IND = 0/0 = is not-a-number.
So I fixed that and it solved the problem.
(Interesting explanation: 
https://stackoverflow.com/questions/14575697/math-pow-with-negative-numbers-and-non-integer-powers 
)

So this may require extra exception handling - though it is probably a 
very case.
It also occured only in one document of more than 100 test documents 
with a special setup.
Robert, can this be solved with a compiler option?
But I have fixed in my code, so probably it will not be a problem anymore.

Jan

Am 18.03.2023 um 11:26 schrieb Jan Angermüller:
> Robert,
>
> I have just tested the Lua 5.4/0.67b version with Perfect Layout in 
> Finale 27.3/*Windows* 10.
> BTW, since the last update v3.0127 Perfect Layout is also compatible 
> with v0.66.
>
> Result: it works, except luaosutils.
>
> In detail:
> First I had to make *ZeroBrane studio* work as it seems to not support 
> 5.4.x by default:
> -Download the Win64 lua5.4.*2* (!) binaries.*I haven't found binaries 
> for 5.4.4.*
> The LuaBinaries project only goes up to 5.4.*2* ( 
> https://sourceforge.net/projects/luabinaries/files/ )
> Then:
> -Put lua54.dll/lua54.exe files into \ZeroBraneStudio\bin
> -Add clibs54 folder similar to clibs53 folder to 
> \ZeroBraneStudio\bin     (just copy&paste and then rename to 54)
> -Go to ZeroBraneStudio\interpreters and copy&paste luadeb53.lua  and 
> make it to luadeb54.lua.
> -Open luadeb54.lua and change 5.3 to 5.4
> -(Re-)Start ZeroBrane Studio and select Lua 5.4 in Project->Lua 
> Interpreter.
>
> I had *five error messages* that didn't occcur in previous versions of 
> RGP Lua/Lua 5.2 of which four could easily be fixed.
> 1.) there was a problem with a duplicate label name which Lua 5.2 has 
> ignored (very weird)
> 2.) the "number of local variables exceeded" error occured (I wonder 
> why it didn't occur in previous versions).
> 3.) tonumber(x,10) accepts both number OR string values for x in 
> Lua5.2,  in Lua5.4 only string values are accepted, otherwise error.
> 4.) the condition local x=0; local n=15; print((n % x)==0) printed 
> "false" in Lua5.2, but gave an error in Lua 5.4   ("Error: attempt to 
> perform n%0")
>
> These were all actually problems in Perfect Layout that Lua5.2 has 
> ignored and which haven't lead to any problems yet.
> So I am glad I could improve my code here.
>
> However, I wasn't able to fix:
> *osutils=require("luaosutils") *  --> this immediately lead to an 
> error message although finaleplugin.LoadLuaOSUtils=true was in plugindef
> The result info box says: "Error:" No message.
> BTW, this pops up although it says 
> finaleplugin.IgnoreReturnValue=true     in the plugindef().
> And I called the uncompiled plug-in code directly - no extra require 
> file was used as in the compiled version.
>
>
> So I removed that line completely and used the original JW Lua 
> implementation without luaosutils and it, yay!, finally worked.
>
> Could it be that the Windows version of your embedded luaosutils has a 
> problem? Haven't tested on macOS.
> Or do I need to change something in the setup?
>
> And finally:
> I have only tested my standard Perfect Layout demo score and another 
> (simple) orchestra score.
> When the osutils issue is solved, I will run it in my standard tests 
> where it automatically compares the output with v0.66.
> I haven't tested the 5.4 compiled version of Perfect Layout either.
>
> But so far, yes, it seems to work.
> Great job!
>
> Jan
>
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> JWLua at jwmusic.nu
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-- 
Jan Angermüller
Orchideenstieg 13
22297 Hamburg
Tel. 040 - 28 94 84 82
Mobil 0173 - 99 33 904
www.elbsound.studio
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