Behavior change in ternary?

[JLogan3o13]

I have been porting some scripts from 3.3.10.2 to 3.3.12.0 (SciTE 14.06.03.20), and noticed odd behavior with a ternary call. I am looking back through the changelog, but don't see anything regarding a change between the two versions. Can someone confirm I am not being thick?

Reproducer:

;I work in 3.3.10.2 but fail beginning in 3.3.11.6 Beta
;The error in 3.3.11.6 is "Statement cannot be just an expression"

#include <GUIConstantsEx.au3>
#include <WindowsConstants.au3>
$mode = 2

($mode = 1) ? (GUICreate("Test Mode 1", 300, 300)) : (GUICreate("Test Mode 2", 300, 300))
GUISetState(@SW_SHOW)

    While 1
        Switch GUIGetMsg()
            Case $GUI_EVENT_CLOSE
                ExitLoop
        EndSwitch
    WEnd

GUIDelete()

I did do some backwards testing down to 3.3.11.0, and found the problem has existed since 3.3.11.6.

Edited June 23, 2014 by JLogan3o13

[JScript]

A simple question: Is there speedup in processing or it only serves to save lines of code?

JS

[JLogan3o13]

I'm not sure if I understand your question; it is not really a matter of whether there is a workaroud if that is what you are asking, I can always go with an if-else statement. I am merely curious as to what caused the change in behavior.

[Melba23]

JLogan3o13,

It is an Au3Check "error" - if you add #AutoIt3Wrapper_Run_AU3Check=n then the code runs without problem. I imagine it was a change made when Au3Check was updated to cope with the ternary operator - you need to add some form of assignment. Doing this:

$hGUI = ( ($mode = 1) ? (GUICreate("Test Mode 1", 300, 300)) : (GUICreate("Test Mode 2", 300, 300)) )

works fine.

M23

[JLogan3o13]

Thanks, much. That should have been my first step in troubleshooting

[guinness]

In C# the code in post #1 is invalid as ternary is to be used as a conditional assignment, which I guess is the case with most languages.

[trancexx]

Just a small remark if I may. More correct usage of the operator would be:

GUICreate(($mode = 1) ? "Test Mode 1" : "Test Mode 2", 300, 300)

Purpose of ternary operator is not to replace If...Then.
 

[jpm]

JLogan3o13,

It is an Au3Check "error" - if you add #AutoIt3Wrapper_Run_AU3Check=n then the code runs without problem. I imagine it was a change made when Au3Check was updated to cope with the ternary operator - you need to add some form of assignment. Doing this:

$hGUI = ( ($mode = 1) ? (GUICreate("Test Mode 1", 300, 300)) : (GUICreate("Test Mode 2", 300, 300)) )

works fine.

M23

 

for me it is an AutoIt error as expression without affectation is not a valid construction

a statement as 1+1 is not legal either for me

[Melba23]

jpm,

If you code the line correctly - as trancexx has kindly (and not for the first time) indicated - the problem is completely banished. I intentionally put quotes around

Au3Check "error"

as I did not see it as a real problem and I was most definitely not expecting you to amend Au3Check - I have the greatest aversion to asking anyone to enter that particular circle of hell!

M23

[trancexx]

for me it is an AutoIt error as expression without affectation is not a valid construction

a statement as 1+1 is not legal either for me

Meh, you don't even know the rules of the language you are developer of. That's terrible jpm.

[JLogan3o13]

Just a small remark if I may. More correct usage of the operator would be:

 

Thanks for this.

 

Purpose of ternary operator is not to replace If...Then. 

 

If this was for me, I agree. I was simply responding to what I perceived to be JScript's question by stating there is another way to get the same effect.

[jpm]

Meh, you don't even know the rules of the language you are developer of. That's terrible jpm.

many thanks for your sarcasm

I still think expression which differ from a simple call should be an error

[trancexx]

It wasn't sarcasm.

[Richard Robertson]

I would side with jpm on this one. I can't see any reason an expression should be used as a statement.

[guinness]

Me too.

[trancexx]

Hm. Why wouldn't one be allowed to write and use function like this:

Func Adlib($vFunc, $bDereg = False)
    ($bDereg ? AdlibUnRegister : AdlibRegister)($vFunc)
EndFunc

...in AutoIt that's perfectly valid, but AU3Check after being "fixed" by jpm will say you have error in the code. Why?

[guinness]

For now Au3Check should be rectified to honour that code. I personally treat ternary usage as I would in C#.

 

Func Adlib($vFunc, $bDereg = False)
    Local $hAdLib = ($bDereg ? AdlibUnRegister : AdlibRegister)
    $hAdLib($vFunc)
EndFunc

[trancexx]

So, there are "reasons"?

Good.

[jpm]

For now Au3Check should be rectified to honour that code. I personally treat ternary usage as I would in C#.

 

Func Adlib($vFunc, $bDereg = False)
    Local $hAdLib = ($bDereg ? AdlibUnRegister : AdlibRegister)
    $hAdLib($vFunc)
EndFunc

I don't get any au3check error on this code

The one from trancexx does not fir fromp the fact that it is an expression not just a function call

[guinness]

No, that code is fine. I was just demonstrating how I personally use ternary. trancexx's code is the one which shouldn't display an Au3Check because AutoIt quite happily parses it.