iota query support was added on January 5, 2022. To support older
versions of the tree-sitter-go grammar (like the latest tagged version,
v0.19.1, which was released on March 3, 2021), check if the query is
supported before trying to use it.
* lisp/progmodes/go-ts-mode.el (go-ts-mode--iota-query-supported-p): New
function.
(go-ts-mode--font-lock-settings): Use it.
">>" "%=" ">>=" "--" "!" "..." "&^" "&^=" "~")
"Go operators for tree-sitter font-locking.")
+(defun go-ts-mode--iota-query-supported-p ()
+ "Returns t if the iota query is supported by the current version of
+the tree-sitter-go grammar."
+ (ignore-errors
+ (or (treesit-query-string "" '((iota) @font-lock-constant-face) 'go) t)))
+
(defvar go-ts-mode--font-lock-settings
(treesit-font-lock-rules
:language 'go
:language 'go
:feature 'constant
- '([(false) (iota) (nil) (true)] @font-lock-constant-face
+ `([(false) (nil) (true)] @font-lock-constant-face
+ ,@(when (go-ts-mode--iota-query-supported-p)
+ '((iota) @font-lock-constant-face))
(const_declaration
(const_spec name: (identifier) @font-lock-constant-face)))