Here is another patch. No big progress since I’m busy moving this week. In this patch I changed from using change hooks to directly updating the trees in edit functions. I also added some node api and tests. Should I keep posting patches, or should I create a branch in /scratch? If the latter, how do I do it?

I’m aware of the ongoing enlightening discussion on potential optimizations for tree-sitter. My plan is to first complete the api and implement some minimal structural editing/font-lock features, then we can concretely measure what needs to improve.

Yuan