Questions about tree-sitter

[BTuin]

Hello,

I have a few questions about tree-sitter.

I'm currently developing a grammar for GNU Bison alongside a tree-sitter
major mode, it's a work in progress.  The grammar is here:
<https://gitlab.com/btuin2/tree-sitter-bison>, still incomplete but so
far able to parse simple files, and the major mode prototype is
attached to this message.

So, the questions:

1. Is there a way to reload a grammar?

Emacs is pretty nice as a playground for testing grammars, but once a
grammar is loaded, it won't be loaded again until Emacs restarts (as far
as I know).
Is it possible to reload a grammar after modifying it?


2. How to mix multiple languages?

It would be very useful for Bison since its mixed with C or other languages.
According to the documentation I need to use the function
`treesit-range-rules` to set the variable `treesit-range-settings`, but
it seems to have no effect.  The language in the selected nodes doesn't
change (as attested by `(treesit-language-at (point))`).

I did it that way (extracted from the attachment):

(setq-local treesit-range-settings
      (treesit-range-rules
       :embed 'c
       :host 'bison
       '((undelimited_code_block) @capture)))

Am I missing something?


3. Is it possible to trigger a hook when a node is modified?

Since Bison supports multiple languages (C, C++, Java and D), I'd like
to watch the declaration "%language LANGUAGE" to change the embedded
language when needed.
Is there a way to do that?


Thanks!

bison-ts-mode.el
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