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Re: [Emacs-diffs] master 8764544: Treat control characters in JSON strin

From: Philipp Stephani
Subject: Re: [Emacs-diffs] master 8764544: Treat control characters in JSON strings as invalid
Date: Fri, 29 Sep 2017 20:50:52 +0000

Stefan Monnier <address@hidden> schrieb am Do., 28. Sep. 2017 um 23:22 Uhr:
>> >>> -  (or (char-after (point)) :json-eof))
>> >> I wonder why it used :json-eof instead of using nil ?
>> >> Any idea?
>> > Not sure--it has been there since json.el was added to Emacs.
>> Then why use 0 now instead of nil?
> Because `following-char' returns 0 at EOB. "At the end of the buffer or
> accessible region, return 0."

But it also returns 0 in other cases.  E.g. if you had changed

    (or (char-after (point)) :json-eof)

it would give you nil at EOB (instead of 0).

I'm wondering what the purpose of `following-char' is. Even in the rare cases where you want to treat EOB and a following null character identically it would be cleaner to write (or (char-after) 0).

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