Racket: Mark all quoted symbols as @symbol

[17451k]

I've noticed that Neovim does not distinguish quoted and unquoted lists and highlights them the same.

For example, (a b c) is a list that can be evaluated as a function call to a with b and c as arguments. But '(a b c) is a list of the symbols a, b, and c, not evaluated, just data.

How it looks now:

How it will look with this PR:

As you may note, this PR doesn't fix highlighting inside (quote (a b c)) - this requires a minor change to the racket treesitter parser and will be implemented separately.

Important disclaimer: I am not a Racket expert, so it's possible that I understand quote semantics incorrectly. I've tried to look at how other editors highlight such code (Emacs, VS Code, Sublime Text, Helix), but they either do not highlight quotes at all, or highlight them approximately the same as Neovim now.

[Lazerbeak12345]

Here's how that code looks in DrRacket

I notice that the Strings are still the same normal color as they always are. I'm not sure what's the correct behavior here. (Side note, no idea what's going on with "astring")

[17451k]

@Lazerbeak12345 Thanks for checking! I've changed the PR to exclude changes to the Strings, now they will look more like in DrRacket.

[Lazerbeak12345]

Oh, don't forget numbers too.

[Lazerbeak12345]

Oh, and booleans. I'm pretty sure just most primitive values.

[17451k]

Yep, I didn't change the highlighting of other primitive types, nut in neovim they are already highlighted as symbols regardless of whether they are quoted or not.

[amaanq]

just an fyi the ancestor functions are expensive - I'd pick one to use it on, and then another not - so ideally the later more-strict query using an ancestor predicate will override the looser former one, you can structure it how you'd like