Re: Tree-sitter, using treesit-range-rules for embedded languages

[Wilhelm Kirschbaum <wilhelm@floatpays.co.za>]

On Tuesday, 22 November 2022 22:39:54 SAST Yuan Fu wrote:
> > On Nov 22, 2022, at 11:52 AM, Wilhelm Hugo Kirschbaum
> > <wilhelm@floatpays.co.za> wrote:> 
> > On Tuesday, 22 November 2022 21:28:48 SAST Yuan Fu wrote:
> >>> On Nov 22, 2022, at 9:24 AM, Wilhelm <wkirschbaum@gmail.com> wrote:
> >>> 
> >>> Is there perhaps an example using treesit-range-rules? To following
> >>> attempt to set treesit-range-settings does not seem to have the desired
> >>> effect.
> >>> 
> >>> (defvar heex--treesit-range-rules
> >>> 
> >>> (treesit-range-rules
> >>> 
> >>>  :embed 'elixir
> >>>  :host 'heex
> >>>  
> >>>  '((directive (partial_expression_value) @cap)
> >>>  
> >>>    (directive (expression_value) @cap)
> >>>    (expression (expression_value) @cap))))
> >>> 
> >>> (setq-local treesit-range-settings heex--treesit-range-rules)
> >>> 
> >>> The following error also pops up when modifying the buffer when removing
> >>> buffer content:
> >>> 
> >>> Error during redisplay: (jit-lock-function 1) signaled
> >>> (treesit-range-invalid "RANGE is either overlapping, out-of-order or
> >>> out-of-range" ((11 . 20)))
> >>> 
> >>> The full attempt is here:
> >>> https://github.com/wkirschbaum/elixir-mode/blob/main/heex-mode.el
> >> 
> >> Thanks Wilhelm. It would be nice if you can provide some example source
> >> file of heex for me to experiment with. I tried to find some on the
> >> internet but didn’t get very far :-)
> >> 
> >> Yuan
> > 
> > Thanks for having a look as I was not sure if this was meant to be used
> > yet.
> > 
> > A heex file can be as simple as this:
> > 
> > #sample.html.heex
> > <div>
> > 
> >  <%= Enum.map([1, 2], &(&1 + 1)) %>
> > 
> > </div>
> > 
> > and the directive <%= (partial_expression_value) %> should then be
> > elixir.,
> > not heex.
> > 
> > When checking with (treesit-language-at (point))  for the embed it still
> > show.
> > 
> > Wilhelm
> 
> Cool. Please see if this works. Admittedly the process is a little “raw”.
> That’s mainly due to me not wanting to commit to a framework before we have
> a lot of real-world experience with multi-language major modes. Please let
> me know if you think how could this be improved. For starters, maybe
> someways to “inherit” font-lock rules with treesit-font-lock-rules? Maybe
> the feature-list should have independent configuration for each language,
> so we don’t have feature-namespace conflicts? (Right now we rename all
> elixir features to elixir-<feature>.)
> 
> I’ve also fixed the warning you see (which is due to treesit.el, not your
> code), so you’ll need to pull master.
> 
> Thanks!
> Yuan

This is great, thank you! The font lock for the embedded language seems to 
work with some quirks, but will have a look in the next couple of days to 
pinpoint any specific issues.

Wilhelm