tree-sitter-elisp VS tree-sitter-html

Here is the tree-sitter grammar of Elisp:

https://github.com/Wilfred/tree-sitter-elisp/blob/main/gramm... (approx. 200 lines)

and here is the grammar of JavaScript:

https://github.com/tree-sitter/tree-sitter-javascript/blob/m... (approx. 1200 lines)

JavaScript evolved into a language of similar complexity as Perl 5 (the corresponding tree sitter syntax table counts almost 2000 lines, currently).

> I like the multiprocess approach with standard protocols, despite its complexities, because it lets different editors share smarts.

Yes, the benefit LSP brings is putting editors/IDEs on equal footing with respect to a specific language. Also the multiplicative effect when the author of a new language provides a language server so nobody needs to switch their IDEs to try it out.

However, seeing how „straight forward“ a tree-sitter specific language grammar looks in practice (1) makes we wonder if by providing a TS grammar for a language would realize (almost) the same benefit. Based on such a grammar and TS’ selector engine figuring out a syntax highlighting scheme, code folder, a docstring or symbol scanner might not be such a huge endeavor any more as you described for ENSIME.

So, yeah, in the end LSP might be dead end at some point, especially because TS promises to be very fast and avoids any IPC. Performance seems to be the biggest problem of LSP clients in Emacs and probably other editors as well.

(1) https://github.com/Wilfred/tree-sitter-elisp/blob/main/gramm... — of course, the example being ELISP makes it look easier than said, if you compare it with the grammar of Perl5 that’s not yet finished unsurprisingly.

(use-package treesit :ensure nil :custom ;; Some stuff taken from here: https://robbmann.io/posts/emacs-treesit-auto/ (treesit-extra-load-path '("/usr/lib64/")) (treesit-language-source-alist '((bash . ("https://github.com/tree-sitter/tree-sitter-bash")) (c . ("https://github.com/tree-sitter/tree-sitter-c")) (c++ . ("https://github.com/tree-sitter/tree-sitter-cpp")) (csharp . ("https://github.com/tree-sitter/tree-sitter-c-sharp")) (css . ("https://github.com/tree-sitter/tree-sitter-css")) (elixir ("https://github.com/elixir-lang/tree-sitter-elixir")) (html . ("https://github.com/tree-sitter/tree-sitter-html")) (java . ("https://github.com/tree-sitter/tree-sitter-java")) (javascript . ("https://github.com/tree-sitter/tree-sitter-javascript")) (json . ("https://github.com/tree-sitter/tree-sitter-json")) (lua . ("https://github.com/Azganoth/tree-sitter-lua")) (makefile . ("https://github.com/alemuller/tree-sitter-make")) (org . ("https://github.com/milisims/tree-sitter-org")) (python . ("https://github.com/tree-sitter/tree-sitter-python")) (tsx . ("https://github.com/tree-sitter/tree-sitter-typescript" "master" "tsx/src")) (typescript . ("https://github.com/tree-sitter/tree-sitter-typescript" "master" "typescript/src")) (ruby . ("https://github.com/tree-sitter/tree-sitter-ruby")) (rust . ("https://github.com/tree-sitter/tree-sitter-rust")) (sql . ("https://github.com/m-novikov/tree-sitter-sql")) (toml . ("https://github.com/tree-sitter/tree-sitter-toml")) (yaml . ("https://github.com/ikatyang/tree-sitter-yaml")))) (major-mode-remap-alist '((c-mode . c-ts-mode) (c++-mode . c++-ts-mode) (csharp-mode . csharp-ts-mode) (css-mode . css-ts-mode) (html-mode . html-ts-mode) (java-mode . java-ts-mode) (js-mode . js-ts-mode) (json-mode . json-ts-mode) (makefile-mode . makefile-ts-mode) ;; (org-mode . org-ts-mode) ;; not mature yet (python-mode . python-ts-mode) (typescript-mode . typescript-ts-mode) (ruby-mode . ruby-ts-mode) (rust-mode . rust-ts-mode) (toml-mode . toml-ts-mode) (yaml-mode . yaml-ts-mode))) (treesit-auto-fallback-alist '((toml-ts-mode . conf-toml-mode) (typescript-ts-mode . nil) (tsx-ts-mode . nil))) (treesit-font-lock-settings t) (treesit-simple-indent t) (treesit-defun-type-regexp t)) (use-package treesit-auto :demand t :config (setq treesit-auto-install t) (global-treesit-auto-mode))

https://github.com/tree-sitter/tree-sitter-html/blob/master/queries/injections.scm is the bit of the HTML treesitter parser that says "anything inside script tags is Javascript" and "anything inside style tags is CSS" so highlight those with a seperate parser.