Is it possible to highlight code examples in doc comments

[ModProg]

Not sure about the capabilities of treesitter, but would it be possible to highlight the code in doc comments? e.g.:

/// ```rs
/// enum Test {
///
/// }
/// ```

[kellpossible]

If tree-sitter adopts an official markdown parser implementation written in Rust, then this could perhaps be used as an embedded parser in a recursive fashion?

[SeniorMars]

This would be really cool. Many IDEs are using semantic highlighting for this, but I believe treesitter would be perfect for this.

[maxcountryman]

I haven't tried this yet, but I stumbled on a technique for highlighting embedded languages in this video that might work here.

[SeniorMars]

Hacky fix

This works for neovim:

In my $XDG_CONFIG_HOME/nvim/queries/rust I have a file called: injections.scm with the following:

 ; extends
(
 (line_comment) @_first 
 (_) @rust
 (line_comment) @_last 
 (#match? @_first "^/// ```$") 
 (#match? @_last "^/// ```$")
 (#offset! @rust 0 4 0 4)
)

(
 (line_comment) @_first
 (_) @rust
 (line_comment) @_last
 (#match? @_first "^/// ```rust$")
 (#match? @_last "^/// ```$")
 (#offset! @rust 0 4 0 4)
)

Now I get highlights like this:

The problem is that this makes neovim very slow, but it's a starting point...

[amaanq]

out of scope for this parser, but this is doable with some post processing via queries/injections or other mechanisms.