Modification

@lower_case / @upper_case

Set the capitalisation of all text in the matched node and its children (besides designated leaf nodes, which remain unchanged).

Example

; Example for SQL, since that's where this makes sense
; (Grammar: https://github.com/DerekStride/tree-sitter-sql)

; Make keywords "select" and "from" lowercase
[
  (keyword_select)
  (keyword_from)
] @lower_case

; Make keyword "WHERE" uppercase
(keyword_where) @upper_case