GNU bug report logs - #14481
24.3.50; Highlighting escape sequences

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Dmitry Gutov <dgutov <at> yandex.ru>
Subject: bug#14481: closed (Re: bug#14481: 24.3.50; Highlighting escape
 sequences)
Date: Sat, 29 Oct 2016 09:12:02 +0000

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Your bug report

#14481: 24.3.50; Highlighting escape sequences

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 14481 <at> debbugs.gnu.org.

-- 
14481: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=14481
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Dmitry Gutov <raaahh <at> gmail.com>
To: Dmitry Gutov <dgutov <at> yandex.ru>, 14481-done <at> debbugs.gnu.org
Subject: Re: bug#14481: 24.3.50; Highlighting escape sequences
Date: Sat, 29 Oct 2016 12:11:49 +0300

On 29.05.2013 00:45, Dmitry Gutov wrote:

> I can release it as a third-party minor mode, no problem.

Now published in GNU ELPA: 
http://elpa.gnu.org/packages/highlight-escape-sequences.html

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From: Dmitry Gutov <dgutov <at> yandex.ru>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3.50; Highlighting escape sequences
Date: Mon, 27 May 2013 09:55:00 +0400

Most of the other text editors highlight stuff like \\, \t, \123 inside
string and regexp literals. For example, Vim and Sublime Text do.

In Emacs, we only have that in emacs-lisp-mode for grouping expressions,
I'm guessing because of their uncommon syntax.

Do we want it in other language modes? Here's some initial
implementation for ruby-mode and js-mode, using the face
font-lock-regexp-grouping-backslash, because it's the closest we have.

(defconst escape-sequence-re
  "\\(\\\\\\(\\(?:[0-9]\\|x\\)\\(?:[0-9]\\(?:[0-9]\\)?\\)?\\|.\\)\\)"
  "Regexp to match an escape sequence.
Currently handles octals (\\123), hexadecimals (\\x12) and
backslash followed by anything else.")

(font-lock-add-keywords
 'ruby-mode
 `((,escape-sequence-re
    (1 (let ((term (nth 3 (syntax-ppss))))
         (when (or (and (eq term ?')
                        (member (match-string 2) '("\\" "'")))
                   (memq term '(?\" ?/ ?\n t)))
           'font-lock-regexp-grouping-backslash))
       prepend)))
 'append)

(font-lock-add-keywords
 'js-mode
 `((,escape-sequence-re
    (1 (when (nth 3 (syntax-ppss))
         'font-lock-regexp-grouping-backslash)
       prepend)))
 'append)

If yes, where should this code live? The regexp itself should be either
the same or quite similar for many modern languages, so I would prefer
to have it in one place.

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