Tree-sitter api (Was: Re: How to add pseudo vector types)

[Fu Yuan <casouri@gmail.com>]

> 在 2021年8月6日，上午1:37，Eli Zaretskii <eliz@gnu.org> 写道：
> 
> 
>> 
>> From: Yuan Fu <casouri@gmail.com>
>> Date: Thu, 5 Aug 2021 23:22:17 -0400
>> Cc: cpitclaudel@gmail.com, stephen_leake@stephe-leake.org,
>> Stefan Monnier <monnier@iro.umontreal.ca>, emacs-devel@gnu.org
>> 
>> I’ve added bindings for set_ranges and pushed the latest code to https://github.com/casouri/emacs/tree/ts
>> 
>> As for now, I’ve created bindings for most of the functions I want to expose. Next I’ll probably write some more tests (in addition to responding reviews and comments).
> 
> Thanks.
> 
> We should probably start thinking how to integrate TS-related
> functionalities into Emacs in general.  E.g., should there be an
> option to activate it? should this option be per major mode? something
> else?

We should have a user option to control tree-sitter on major mode level. Maybe an alist where each car is a major node symbol and each cdr is a Boolean value toggling tree-sitter for that node.

We also need tree-sitter-maximum-buffer-size, so that buffer larger than this size won’t enable tree-sitter. (And we need to make sure we never use tree-sitter on buffers larger than 4GB because tree-sitter uses unint32.)

And we can provide a function free-sitter-should-activate-p that computes if we should enable tree-sitter in the current buffer by variables mentioned above, that can be used by major-modes when setting up.

I’m also thinking about having a tree-sitter-defaults that’s analogous to font-lock-defaults, that is set by each major node and used to generate tree-sitter-font-lock-settings.

As for indentation, we could provide some infrastructure like we do for font-locking, or we can just let major modes implement their indent function with tree-sitter api.

Yuan