Expand on custom functions

[FEDE0D]

Currently we have only the option to create custom functions and use them on manually created expressions.
If we want to use them on a parse expression, it is currently not supported.
For example, I need to add a min & max operations (IDK why they are not included by default) and I cannot use them on parsed expressions.
It would be useful if we could add custom Tokens into the lexer.

[S-Man42]

+1 on this! :)

I need several custom functions within the parser, too.

[S-Man42]

Any news on that? I'd really appreciate that.

[fkleon]

The existing CustomFunction class isn't super useful right now for the use case you're after.

Have a look at #54 which introduces a facility to specify your own Dart handler code for functions, and also adds parser support.
Would that solve your issue?

[S-Man42]

Well, sounds interesting. Will play around with it once it is merged and released... Maybe that might help me.