plane icon Welcome to Microsoft Flight Simulator’s SDK Q&A Platform!

You have questions regarding the SDK? DevMode Tools? SimConnect? You would like to submit an idea for future improvements, seek help or exchange knowledge? You’re in the right place.


Please take a moment to read the platform’s guidelines before you get started!


question

WombiiActual avatar image
WombiiActual asked Nocturne edited

RPN string operators SDK docs corrections

Had some trouble writing missionscripts with a calculator and discovered some errors in the SDK docs for the RPN string operations. "scmi" is not case sensitive. "sstr" is case sensitive and backwards (both description and example). "schr" I'm not sure about, because it's not returning what I'm expecting it to based on description.

Either the docs are incorrect or this is different behaviour for mission script xml.

Location:

https://docs.flightsimulator.com/html/Additional_Information/Reverse_Polish_Notation.htm

Expression operators - String operators


The RPN code in the examples here is taken from my testcript, so the comment at the end of the line has the returned value seen in the behaviour window in the sim.


schr - Should find specific symbol in a string. Don't seem to be working as described, not sure why?

'abcd' 'b' schr (&gt;L:wTEST_stringSCHR21) <!-- 4 -->
'abcd' 'r' schr (&gt;L:wTEST_stringSCHR22) <!-- 4 -->
'b' 'abcd' schr (&gt;L:wTEST_stringSCHR23) <!-- 1 -->
'r' 'abcd' schr (&gt;L:wTEST_stringSCHR24) <!-- 1 -->


scmi - (Compares two strings) Is NOT case sensitive, otherwise correct.

Match: 

'left' 'Left' scmi 0 == if{ 1 } els{ 0 } (&gt;L:wTEST_stringSCMI1) <!-- 1 -->
'left' 'left' scmi 0 == if{ 2 } els{ 0 } (&gt;L:wTEST_stringSCMI2) <!-- 2 -->

No match: 

'left' 'right' scmi 0 == if{ 3 } els{ 0 } (&gt;L:wTEST_stringSCMI3) <!-- 0 -->


sstr - Finds the position of substring B in A, not A in B (description and example backwards) and IS case sensitive

Example says this should return 2, but it returns -1:

'cx' 'abcxyz' sstr

Reversing A and B works:

'abcxyz' 'cx' sstr (&gt;L:wTEST_stringSSTR4) <!-- 2 -->
'abcxyz' 'yz' sstr (&gt;L:wTEST_stringSSTR5) <!-- 4 -->
'abcxyz' 'ab' sstr (&gt;L:wTEST_stringSSTR6) <!-- 0 -->
'abcxyz' 'rt' sstr (&gt;L:wTEST_stringSSTR7) <!-- -1 -->
'rt' 'abcxyz' sstr (&gt;L:wTEST_stringSSTR8) <!-- -1 -->
documentation
10 |10000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 5 attachments (including images) can be used with a maximum of 4.8 MiB each and 23.8 MiB total.

1 Answer

·
Nocturne avatar image
Nocturne answered Nocturne edited

Hello! Thank you for pointing out these issues. To clarify:

- schr : Currently behaves incorrectly indeed, and is an error in the code that will be fixed (unfortunately not for the public SU11, but for the next update after that)

- scmi : Your observation is correct and the documentation will be fixed in the public SU11 release to clarify that this is indeed NOT case sensitive.

- sstr : Again, your observation is correct and the documentation will be fixed in the public SU11 release to show the correct order of operations.

I appreciate you taking the time to mention these issues and I hope they haven't caused you too many problems!


EDIT: While investigating we've discovered that ssub was also incorrect. This has been updated for SU11 as well. Here's the revised doc for you in case you need it:

1667388303012.png


1667388303012.png (19.2 KiB)
10 |10000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 5 attachments (including images) can be used with a maximum of 4.8 MiB each and 23.8 MiB total.

Write an Answer

Hint: Notify or tag a user in this post by typing @username.

Up to 5 attachments (including images) can be used with a maximum of 19.1 MiB each and 23.8 MiB total.