Re: tex-mode.el for setting superscript and subscript face

[Robert Pluim]

>>>>> On Thu, 14 Jan 2021 11:29:34 +0100, Christopher Dimech <dimech@gmx.com> 
>>>>> said:

    Christopher> I am working on a minor mode that will use the superscipt and 
subscript
    Christopher> functionality for texinfo-mode.

Well, itʼs easy enough to locate. lisp/tex-mode.el:646

(defun tex-font-lock-match-suscript (limit)
  "Match subscript and superscript patterns up to LIMIT."
  (when (and tex-fontify-script
             (re-search-forward "[_^] *\\([^\n\\{}]\\|\
\\\\\\([a-zA-Z@]+\\|[^ \t\n]\\)\\|\\({\\)\\)" limit t))
    (when (match-end 3)
      (let ((beg (match-beginning 3))
            (end (save-restriction
                   (narrow-to-region (point-min) limit)
                   (condition-case nil (scan-lists (point) 1 1) (error nil)))))
        (store-match-data (if end
                              (list (match-beginning 0) end beg end)
                            (list beg beg beg beg)))))
    t))

(defconst tex-font-lock-keywords-3
  (append tex-font-lock-keywords-2
          '((tex-font-lock-match-suscript
             (1 (tex-font-lock-suscript (match-beginning 0)) append))))
  "Experimental expressions to highlight in TeX modes.")