GNU bug report logs - #22983
syntax-ppss returns wrong result.

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Alan Mackenzie <acm <at> muc.de>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#22983: closed (syntax-ppss returns wrong result.)
Date: Sun, 01 Oct 2017 16:32:02 +0000

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Your message dated 1 Oct 2017 16:31:03 -0000
with message-id <20171001163103.24902.qmail <at> mail.muc.de>
and subject line Re: bug#22983: syntax-ppss returns wrong result.
has caused the debbugs.gnu.org bug report #22983,
regarding syntax-ppss returns wrong result.
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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22983: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=22983
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From: Alan Mackenzie <acm <at> muc.de>
To: bug-gnu-emacs <at> gnu.org
Subject: syntax-ppss returns wrong result.
Date: Fri, 11 Mar 2016 15:15:12 +0000

Hello, Emacs.

The fundamental contract in syntax-ppss is that (syntax-ppss POS)
returns the same value as (parse-partial-sexp (point-min) POS) (with the
exception of elements 2 and 6).  This is currently not always the case.

In the master branch, emacs -Q and visit xdisp.c with C-x C-f.  Follow
this recipe:

    M-: (syntax-ppss-flush-cache 1)
    M-: (setq ppss-0 (syntax-ppss 40000))
    M-<
    C-s #include " <CR>
    M->
    C-x n n
    M-: (setq ppss-1 (syntax-ppss 40000))
    M-: (setq parse (parse-partial-sexp (point-min) 40000))

At this point, `ppss-1' and `parse' should match (apart from elements 2
and 6).  What we actually have is:

    ppss-1: (2 39992 nil nil nil nil 2 nil nil (39975 39992))
    parse:  (0 nil 15674 34 nil nil 0 nil 15675 nil)

.

-- 
Alan Mackenzie (Nuremberg, Germany).

[Message part 3 (message/rfc822, inline)]

From: Alan Mackenzie <acm <at> muc.de>
To: 22983-done <at> debbugs.gnu.org
Subject: Re: bug#22983: syntax-ppss returns wrong result.
Date: 1 Oct 2017 16:31:03 -0000

The bug has been fixed by patches to the emacs-26 branch.

-- 
Alan Mackenzie (Nuremberg, Germany).

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