GNU bug report logs - #25215
25.1.90; js--proper-indentation is affected by the value of forward-sexp-function

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Dmitry Gutov <dgutov <at> yandex.ru>
Subject: bug#25215: closed (Re: bug#25215: 25.1.90; js--proper-indentation
 is affected by the value of forward-sexp-function)
Date: Sat, 17 Dec 2016 00:01:02 +0000

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Your bug report

#25215: 25.1.90; js--proper-indentation is affected by the value of forward-sexp-function

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 25215 <at> debbugs.gnu.org.

-- 
25215: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=25215
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Dmitry Gutov <dgutov <at> webzilla.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 25215-done <at> debbugs.gnu.org
Subject: Re: bug#25215: 25.1.90; js--proper-indentation is affected by the
 value of forward-sexp-function
Date: Sat, 17 Dec 2016 02:00:27 +0200

On 16.12.2016 23:02, Eli Zaretskii wrote:

> Thanks, this is okay for the release branch.

Thanks, installed.

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From: Dmitry Gutov <dgutov <at> webzilla.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.1.90; js--proper-indentation is affected by the value of
 forward-sexp-function
Date: Fri, 16 Dec 2016 14:58:35 +0200

js2-mode derives from js-mode and, starting with Emacs 25.1, inherits
its indentation function.

However, forward-sexp-function in js2-mode can be slow because it uses
the AST, and when the current parsing pass had been interrupted by user
input, it's forced to finish. Which is slow in large files.

And its subtleties aren't really needed by the intentation code. So in
the various bits of code we've brought over from js2-mode we have kept
the forward-sexp-function->nil binding.

We've missed it in js--multi-line-declaration-indentation, hovewer. And
in js--maybe-goto-declaration-keyword-end (though that one only comes
into play with a non-default value of js-indent-first-init).

The patch is below.

diff --git a/lisp/progmodes/js.el b/lisp/progmodes/js.el
index 6d995a0..9aa459d 100644
--- a/lisp/progmodes/js.el
+++ b/lisp/progmodes/js.el
@@ -1851,7 +1851,8 @@ js--multi-line-declaration-indentation
   "Helper function for `js--proper-indentation'.
 Return the proper indentation of the current line if it belongs to a 
declaration
 statement spanning multiple lines; otherwise, return nil."
-  (let (at-opening-bracket)
+  (let (forward-sexp-function ; Use Lisp version.
+        at-opening-bracket)
     (save-excursion
       (back-to-indentation)
       (when (not (looking-at js--declaration-keyword-re))
@@ -1928,6 +1929,7 @@ js--maybe-goto-declaration-keyword-end
     (let ((bracket (nth 1 parse-status))
           declaration-keyword-end
           at-closing-bracket-p
+          forward-sexp-function ; Use Lisp version.
           comma-p)
       (when (looking-at js--declaration-keyword-re)
         (setq declaration-keyword-end (match-end 0))

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