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Tree sitter: allowing access to `ts_tree_get_changed_ranges()' from elis
Tree sitter: allowing access to `ts_tree_get_changed_ranges()' from elisp
Sat, 26 Nov 2022 15:57:33 +0100
Dear Emacs developers,
I'm a contributor to Symex.el
(<https://github.com/drym-org/symex.el>), a structural editing package
based on Evil. The core package was originally designed to be used
with Lisp languages but I have been working on it to add support for
other languages via Tree Sitter.
This work has been going on for quite a while so I am currently using
Tuấn-Anh Nguyễn's `elisp-tree-sitter' package
(<https://github.com/emacs-tree-sitter/elisp-tree-sitter>). As Yuan
Fu's tree-sitter branch has just been merged I decided this was a good
time to look into updating Symex.el so that it can use the built-in
version instead when it's available.
Progress so far has been good and I have a large portion of the
functionality working with both implementations. However I've just
found a feature that I'm using in `elisp-tree-sitter' that does not
seem to be available in the built-in version.
Part of the functionality I use is fetching a list of ranges that have
been changed between the previous and current parser trees (after an
editing operation). This is exposed by `elisp-tree-sitter' via the
`tsc-changed-ranges' function. From the docstring, "…This function
returns a sequence of ranges whose syntactic structure has changed." I
can't find an equivalent function exposed by the built-in tree sitter
I've checked src/treesit.c and I can see that there is a
`ts_tree_get_changed_ranges()' function, presumably from the
underlying tree sitter library. However I don't think this is being
exposed to elisp. Would it be possible to allow this information to be
provided to elisp somehow?
Thanks in advance for your help, and apologies if this is already
available and I have simply missed it.
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- Tree sitter: allowing access to `ts_tree_get_changed_ranges()' from elisp,
Simon Pugnet <=