Hi all,
I'm working on (or rather with) functions managing nested association lists
(taken from Jan-Peter's
https://github.com/openlilylib/openlilylib/blob/master/ly/_internal/utilities/alist-access.ily).
This is intended to manage a hierarchical object with configuration
options for a project or a library.
One thing I didn't manage to come up with so far is a way to add "type
checking".
So far a key is created and initialized with a command
\registerOption path.to.key initial-value
Later only registered keys can be modified with a
\setOption new-value
command.
This is already great, but it would be cool if \registerOption could
accept an (optional) predicate argument and store that predicate so that
a subsequent \setOption will only be successful if the new value
satisfies the predicate.
Any ideas how to achieve that?
I thought about storing a pair of predicate and value instead of only
the value but so far it failed completely ;-)
Thanks for any suggestions
Urs
_______________________________________________
lilypond-user mailing list
[email protected]
https://lists.gnu.org/mailman/listinfo/lilypond-user
