Finish replacing SGML-based JSX detection with js-mode’s parsing

This removes the last dependency on sgml-mode for JSX-related logic.

* lisp/progmodes/js.el (js-jsx--start-tag-re)
(js-jsx--end-tag-re): Remove.
(js-jsx--looking-back-at-end-tag-p): Reimplement using text
properties, using syntax information which ought to be slightly more
accurate than regexps since it was found by complete parsing.
parent 1a1ef285
......@@ -50,7 +50,6 @@
(require 'imenu)
(require 'moz nil t)
(require 'json)
(require 'sgml-mode)
(require 'prog-mode)
......@@ -2211,13 +2210,10 @@ testing for syntax only valid as JSX."
(js--regexp-opt-symbol '("in" "instanceof")))
"Regexp matching operators that affect indentation of continued expressions.")
(defconst js-jsx--start-tag-re
(concat "<" sgml-name-re)
"Regexp matching code that looks like a JSXOpeningElement.")
(defun js-jsx--looking-at-start-tag-p ()
"Non-nil if a JSXOpeningElement immediately follows point."
(looking-at js-jsx--start-tag-re))
(let ((tag-beg (get-text-property (point) 'js-jsx-tag-beg)))
(and tag-beg (memq (car tag-beg) '(open self-closing)))))
(defun js--looking-at-operator-p ()
"Return non-nil if point is on a JavaScript operator, other than a comma."
......@@ -2263,13 +2259,9 @@ testing for syntax only valid as JSX."
(setq result nil)))
(defconst js-jsx--end-tag-re
(concat "</" sgml-name-re ">\\|/>")
"Regexp matching a JSXClosingElement.")
(defun js-jsx--looking-back-at-end-tag-p ()
"Non-nil if a JSXClosingElement immediately precedes point."
(looking-back js-jsx--end-tag-re (point-at-bol)))
(get-text-property (point) 'js-jsx-tag-end))
(defun js--continued-expression-p ()
"Return non-nil if the current line continues an expression."
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