bug#15061: 24.3; forward-sexp behaves inaccurately when the cursor is at the end of a string

bug#15061: 24.3; forward-sexp behaves inaccurately when the cursor is at the end of a string

[Alex Coventry]

This bug report will be sent to the Bug-GNU-Emacs mailing list
and the GNU bug tracker at debbugs.gnu.org.  Please check that
the From: line contains a valid email address.  After a delay of up
to one day, you should receive an acknowledgment at that address.

Please write in English if possible, as the Emacs maintainers
usually do not have translators for other languages.

Please describe exactly what actions triggered the bug, and
the precise symptoms of the bug.  If you can, give a recipe
starting from `emacs -Q':

########################################################################

Start with 'emacs -Q'.  In *scratch*, type the following

   (("foo" baz) quux "bar")

Move the cursor to the second quote character.  In the pipe notation
used in the paredit documentation[1], that corresponds to

   (("foo|" baz) quux "bar")

Type C-M-f ("forward-sexp").  Cursor will now be on the "b" in "bar":

   (("foo" baz) quux "|bar")

I would expect it to be just after the quote it was initially on, i.e.

   (("foo"| baz) quux "bar")

I suppose fixing this might require parsing of the entire buffer,
font-lock style, but it is a bug.

Best regards,
Alex

[1] http://www.emacswiki.org/emacs/PareditCheatsheet

########################################################################

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     `bt full' and `xbacktrace'.
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In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.4.2)
  of 2013-04-14 on chindi10, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11103000
System Description:    Ubuntu 12.04.2 LTS

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  `configure '--build' 'x86_64-linux-gnu' '--build' 'x86_64-linux-gnu'
  '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
  '--localstatedir=/var/lib' '--infodir=/usr/share/info'
  '--mandir=/usr/share/man' '--with-pop=yes'
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  '--with-crt-dir=/usr/lib/x86_64-linux-gnu' '--with-x=yes'
  '--with-x-toolkit=gtk3' '--with-toolkit-scroll-bars'
  'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fstack-protector
  --param=ssp-buffer-size=4 -Wformat -Wformat-security
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  -Wl,-z,relro' 'CPPFLAGS=-D_FORTIFY_SOURCE=2''

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bug#15061: 24.3; forward-sexp behaves inaccurately when the cursor is at the end of a string

[Glenn Morris]

Alex Coventry wrote:

>   (("foo" baz) quux "bar")
>
> Move the cursor to the second quote character.  In the pipe notation
> used in the paredit documentation[1], that corresponds to
>
>   (("foo|" baz) quux "bar")
>
> Type C-M-f ("forward-sexp").  Cursor will now be on the "b" in "bar":
>
>   (("foo" baz) quux "|bar")

C-h f forward-sexp:

   This command assumes point is not in a string or comment.