Function: js--syntax-propertize-extend-region

js--syntax-propertize-extend-region is a byte-compiled function defined in js.el.gz.

Signature

(js--syntax-propertize-extend-region START END)

Documentation

Extend the START-END region for propertization, if necessary.

For use by syntax-propertize-extend-region-functions.

Source Code

;; Defined in /usr/src/emacs/lisp/progmodes/js.el.gz
;; Adding `syntax-multiline' text properties to JSX isn’t sufficient
;; to identify multiline JSX when first typing it.  For instance, if
;; the user is typing a JSXOpeningElement for the first time…
;;
;;   <div
;;       ^ (point)
;;
;; …and the user inserts a line break after the tag name (before the
;; JSXOpeningElement starting on that line has been unambiguously
;; identified as such), then the `syntax-propertize' region won’t be
;; extended backwards to the start of the JSXOpeningElement:
;;
;;   <div         ← This line wasn’t JSX when last edited.
;;     attr="">   ← Despite completing the JSX, the next
;;             ^    `syntax-propertize' region wouldn’t magically
;;                  extend back a few lines.
;;
;; Therefore, to try and recover from this scenario, parse backward
;; from “>” to try and find the start of JSXBoundaryElements, and
;; extend the `syntax-propertize' region there.

(defun js--syntax-propertize-extend-region (start end)
  "Extend the START-END region for propertization, if necessary.
For use by `syntax-propertize-extend-region-functions'."
  (if js-jsx-syntax (js-jsx--syntax-propertize-extend-region start end)))