Emacs

Emacs 29+ is needed (eglot and tree-sitter are built in). OxL does not ship a ready major mode; a minimal one follows.

File mode#

elisp

;; ~/.emacs.d/init.el
(define-derived-mode oxl-mode prog-mode "OxL"
  "Major mode for OxL."
  (setq-local comment-start "// " comment-end "")
  (setq-local indent-tabs-mode nil tab-width 2))
(add-to-list 'auto-mode-alist '("\\.oxl\\'" . oxl-mode))

With the tree-sitter grammar (after tree-sitter generate in share/oxl/tree-sitter-oxl, then build the library libtree-sitter-oxl.so into ~/.emacs.d/tree-sitter/):

cd /opt/oxl-1.0.0-beta/share/oxl/tree-sitter-oxl && npx tree-sitter generate
cc -shared -fPIC -O2 -Isrc src/parser.c -o ~/.emacs.d/tree-sitter/libtree-sitter-oxl.so

elisp

(define-derived-mode oxl-ts-mode prog-mode "OxL[ts]"
  (when (treesit-ready-p 'oxl)
    (treesit-parser-create 'oxl)
    (setq-local treesit-font-lock-settings
                (treesit-font-lock-rules :language 'oxl :feature 'all
                                         ;; содержимое queries/highlights.scm: переведите capture-имена в faces
                                         '((comment) @font-lock-comment-face (string) @font-lock-string-face))
                treesit-font-lock-feature-list '((all)))
    (treesit-major-mode-setup)))
(add-to-list 'auto-mode-alist '("\\.oxl\\'" . oxl-ts-mode))

Translate the capture names of queries/highlights.scm (@keyword, @type, …) into Emacs font-lock-*-face faces with a table of your taste; semantic tokens from the server are shown by eglot itself (Emacs 30+), so the minimal mode above already highlights meaningfully.

eglot#

elisp

(require 'eglot)
(add-to-list 'eglot-server-programs '((oxl-mode oxl-ts-mode) . ("oxl" "lsp")))
(add-hook 'oxl-mode-hook #'eglot-ensure)
(add-hook 'oxl-ts-mode-hook #'eglot-ensure)
;; форматирование при сохранении, inlay-подсказки
(add-hook 'oxl-mode-hook (lambda () (add-hook 'before-save-hook #'eglot-format-buffer nil t)
                                   (eglot-inlay-hints-mode 1)))

Commands: M-. definition, M-? references, eglot-rename, eglot-code-actions, eldoc. init_options are passed like this: (add-to-list 'eglot-server-programs '(oxl-mode . ("oxl" "lsp" :initializationOptions (:debounceMs 150)))).

lsp-mode#

elisp

(require 'lsp-mode)
(add-to-list 'lsp-language-id-configuration '(oxl-mode . "oxl"))
(lsp-register-client
 (make-lsp-client :new-connection (lsp-stdio-connection '("oxl" "lsp"))
                  :activation-fn (lsp-activate-on "oxl")
                  :server-id 'oxl-lsp
                  :priority 1))
(add-hook 'oxl-mode-hook #'lsp-deferred)

Debugging#

With dape:

elisp

(with-eval-after-load 'dape
  (add-to-list 'dape-configs
               `(oxl-launch
                 modes (oxl-mode oxl-ts-mode)
                 command "oxl" command-args ("dap")
                 :type "oxl" :request "launch"
                 :program "." :cwd "." :oxlProfile "dev")))

M-x dape then oxl-launch. With dap-mode: (dap-register-debug-provider "oxl" ...) with the adapter oxl dap over stdio; the parameters are the same. See debugging.