feature/tree-sitter 9c4dddad45 4/6: Add some js-mode tree-sitter indent rules

[Yuan Fu]

branch: feature/tree-sitter
commit 9c4dddad456e23892a80303da26774a13250b647
Author: Yuan Fu <casouri@gmail.com>
Commit: Yuan Fu <casouri@gmail.com>

    Add some js-mode tree-sitter indent rules
    
    * lisp/progmodes/js.el (js--treesit-indent-rules): Add rules and a let
    form.
---
 lisp/progmodes/js.el | 59 +++++++++++++++++++++++++++++-----------------------
 1 file changed, 33 insertions(+), 26 deletions(-)

diff --git a/lisp/progmodes/js.el b/lisp/progmodes/js.el
index f258b093f4..583de0c503 100644
--- a/lisp/progmodes/js.el
+++ b/lisp/progmodes/js.el
@@ -3415,32 +3415,39 @@ This function is intended for use in 
`after-change-functions'."
       (point))))
 
 (defvar js--treesit-indent-rules
-  `((javascript
-     (no-node (js--treesit-backward-up-list) ,js-indent-level)
-     ((node-is "}") parent-bol 0)
-     ((node-is ")") parent-bol 0)
-     ((node-is "]") parent-bol 0)
-     ((node-is ">") parent-bol 0)
-     ((node-is "\\.") parent-bol ,js-indent-level)
-     ((parent-is "named_imports") parent-bol ,js-indent-level)
-     ((parent-is "statement_block") parent-bol ,js-indent-level)
-     ((parent-is "variable_declarator") parent-bol ,js-indent-level)
-     ((parent-is "arguments") parent-bol ,js-indent-level)
-     ((parent-is "array") parent-bol ,js-indent-level)
-     ((parent-is "formal_parameters") parent-bol ,js-indent-level)
-     ((parent-is "template_substitution") parent-bol ,js-indent-level)
-     ((parent-is "object_pattern") parent-bol ,js-indent-level)
-     ((parent-is "object") parent-bol ,js-indent-level)
-     ((parent-is "arrow_function") parent-bol ,js-indent-level)
-     ((parent-is "parenthesized_expression") parent-bol ,js-indent-level)
-
-     ;; JSX
-     ((parent-is "jsx_opening_element") parent ,js-indent-level)
-     ((node-is "jsx_closing_element") parent 0)
-     ((node-is "jsx_text") parent ,js-indent-level)
-     ((parent-is "jsx_element") parent ,js-indent-level)
-     ((node-is "/") parent 0)
-     ((parent-is "jsx_self_closing_element") parent ,js-indent-level))))
+  (let ((switch-case (rx "switch_" (or "case" "default"))))
+    `((javascript
+       (no-node (js--treesit-backward-up-list) ,js-indent-level)
+       ((node-is "}") parent-bol 0)
+       ((node-is ")") parent-bol 0)
+       ((node-is "]") parent-bol 0)
+       ((node-is ">") parent-bol 0)
+       ((node-is "\\.") parent-bol ,js-indent-level)
+       ((node-is ,switch-case) parent-bol 0)
+       ;; "{" on the newline.
+       ((node-is "statement_block") parent-bol ,js-indent-level)
+       ((parent-is "named_imports") parent-bol ,js-indent-level)
+       ((parent-is "statement_block") parent-bol ,js-indent-level)
+       ((parent-is "variable_declarator") parent-bol ,js-indent-level)
+       ((parent-is "arguments") parent-bol ,js-indent-level)
+       ((parent-is "array") parent-bol ,js-indent-level)
+       ((parent-is "formal_parameters") parent-bol ,js-indent-level)
+       ((parent-is "template_substitution") parent-bol ,js-indent-level)
+       ((parent-is "object_pattern") parent-bol ,js-indent-level)
+       ((parent-is "object") parent-bol ,js-indent-level)
+       ((parent-is "pair") parent-bol ,js-indent-level)
+       ((parent-is "arrow_function") parent-bol ,js-indent-level)
+       ((parent-is "parenthesized_expression") parent-bol ,js-indent-level)
+       ((parent-is "class_body") parent-bol ,js-indent-level)
+       ((parent-is ,switch-case) parent-bol ,js-indent-level)
+
+       ;; JSX
+       ((parent-is "jsx_opening_element") parent ,js-indent-level)
+       ((node-is "jsx_closing_element") parent 0)
+       ((node-is "jsx_text") parent ,js-indent-level)
+       ((parent-is "jsx_element") parent ,js-indent-level)
+       ((node-is "/") parent 0)
+       ((parent-is "jsx_self_closing_element") parent ,js-indent-level)))))
 
 (defvar js--treesit-keywords
   '("as" "async" "await" "break" "case" "catch" "class" "const" "continue"