Observations on preprocessing test of boolean expression [V1.2020.19]

Question

Hello PlantUML team,

From:

• https://forum.plantuml.net/5171/please-provide-logical-operator-ifdef-preprocessor-command?show=5175#c5175
• https://forum.plantuml.net/9702/%25false-returns-0-not-false-%25true-returns-1-not-true?show=9710#a9710

And after some preprocessing tests of boolean expression:

!$a=1 || 0
!$b=1||0
!$c=1 | 0
!$d=1|0  

[See on PlantUML server]

• Why all the expressions does not return the same result?
• Is it a bug or not?

 

Thanks for your support,
Regards,
Th.

Answer 1

Hello PlantUML team,

With the version V1.2020.20, this is fixed, with this error message :

!$c=1 | 0
^^^^^
 Parsing syntax error about |

or

!$c=1 & 0
^^^^^
 Parsing syntax error about &

Then old short form: `&`, `|` or `!` are only for old preprocessor.

And the new preprocessing support only `&&` and `||` or `%not()`.

The documentation has been updated accordingly:  See new §Boolean expression on Preprocessing page.

Thanks for yours works  ,
Regards,
Th.