[Feature] [PL] Make [hidden] a conditional attribute

[Kein]

What feature would you like to see?

[[hidden("true/false")]]

How will this feature be useful to you and others?

This will allow to conditionally hide some variables/pattern values depending on the parsing result

Request Type

• I can provide a PoC for this feature or am willing to work on it myself and submit a PR

Additional context?

No response

[paxcut]

Why only for [[hidden]]? Anyway, this has been asked already in a pattern language issue and partially addressed there.

[paxcut]

Isn't this the same thing?

if (condition)
    SomeType var;
else
     padding[sizeof(SomeType)];//or maybe SomeType var[[hidden]];

and that has always been possible. As for arbitrary conditional attribute with parameters you can use the ternary conditional operator to set the parameter value which in effect is the feature requested in issue #16. If nameString and indexString are defined in pattern then the following already works.

} [[name(value==35 ? nameString : "["+indexString+"]")]];

[Kein]

The idea is:

[[hidden(value==35)]]

More clear and concise, succinct declaration, easier to read