GNU bug report logs - #13973
thingatpt.el and end-of-sexp in python-mode

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Package: emacs; Severity: minor; Reported by: Andreas Röhler <andreas.roehler@HIDDEN>; dated Sat, 16 Mar 2013 07:53:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
Changed bug title to 'thingatpt.el and end-of-sexp in python-mode' from 'Subject: 24.3; thingatpt.el, end-of-sexp' Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Removed tag(s) moreinfo. Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Andreas =?utf-8?Q?R=C3=B6hler?= <andreas.roehler@HIDDEN>
Subject: Re: bug#13973: Subject: 24.3; thingatpt.el, end-of-sexp
References: <51442486.4070100@HIDDEN> <87a6l9ufug.fsf@HIDDEN>
 <524429ba-026c-e5a6-579e-1789bd2cee1a@HIDDEN>
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Date: Sat, 28 Aug 2021 17:05:42 +0200
In-Reply-To: <50eab79c-0ea8-87e8-9574-670a03669f4a@HIDDEN> ("Andreas
 =?utf-8?Q?R=C3=B6hler=22's?= message of "Fri, 27 Aug 2021 20:44:33 +0200")
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 Content preview:  Andreas Röhler <andreas.roehler@HIDDEN> writes: >
   BTW end-of-sexp is declared obsolete meanwhile. Below an adapted test. Thanks.
    The odd movements happen in these cases: 
 
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Andreas R=C3=B6hler <andreas.roehler@HIDDEN> writes:

> BTW end-of-sexp is declared obsolete meanwhile. Below an adapted test.

Thanks.  The odd movements happen in these cases:

"|""Some hint"""

"""Some hint|"""

where | is point.

--=20
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#13973; Package emacs. Full text available.

Message received at 13973 <at> debbugs.gnu.org:


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Subject: Re: bug#13973: Subject: 24.3; thingatpt.el, end-of-sexp
To: Lars Ingebrigtsen <larsi@HIDDEN>
References: <51442486.4070100@HIDDEN> <87a6l9ufug.fsf@HIDDEN>
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From: =?UTF-8?Q?Andreas_R=c3=b6hler?= <andreas.roehler@HIDDEN>
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On 26.08.21 16:05, Lars Ingebrigtsen wrote:
> Andreas Röhler <andreas.roehler@HIDDEN> writes:
>
>>>> Maybe put the Python code below at the top of some buffer and run the
>>>> test delivered below:
>>>>
>>>> # Python
>>>>
>>>> def main():
>>>>       """Some hint"""
>>>>       if len(sys.argv) == 1:
>>>>           usage()
>>>>
>>>> ;; Elisp
>>>> (defun forward-sexp-text ()
>>>>     (interactive)
>>>>     (goto-char 30 )
>>>>     (forward-sexp))
>>> By that goto-char, do you mean the "S" character?
>> No, sorry, the 5th double-quote of the triple-quoted-string.
> That gives me
>
> forward-sexp: Scan error: "Unbalanced parentheses", 40, 86
>
> which I think is the right thing?

If inside a string, forward-sexp --or end-of-- should reach the end of 
this string.

BTW end-of-sexp is declared obsolete meanwhile. Below an adapted test.


(defun my-thing-at-point--end-of-sexp-test ()
   (interactive)
   (goto-char (point-max))
   (search-backward "\"" nil t 6)
   ;; the only one ending correctly behind the string
   (thing-at-point--end-of-sexp)
   (goto-char (point-max))
   (search-backward "\"" nil t 6)
   (forward-char 4)
   (thing-at-point--end-of-sexp)
   (goto-char (point-max))
   (search-backward "\"" nil t 3)
   (thing-at-point--end-of-sexp)
   (goto-char (point-max))
   (search-backward "\"" nil t 2)
   (thing-at-point--end-of-sexp))

and here the Python code to test again:


def main():
      """Some hint"""
      if len(sys.argv) == 1:
          usage()



>
> This bug report started with thingatpt.  What is the real thingatpt use
> case that doesn't work in triple-quoted strings?
>
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#13973; Package emacs. Full text available.

Message received at 13973 <at> debbugs.gnu.org:


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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Andreas =?utf-8?Q?R=C3=B6hler?= <andreas.roehler@HIDDEN>
Subject: Re: bug#13973: Subject: 24.3; thingatpt.el, end-of-sexp
References: <51442486.4070100@HIDDEN> <87a6l9ufug.fsf@HIDDEN>
 <524429ba-026c-e5a6-579e-1789bd2cee1a@HIDDEN>
 <87k0k9n70g.fsf@HIDDEN>
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Date: Thu, 26 Aug 2021 16:05:32 +0200
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 =?utf-8?Q?R=C3=B6hler=22's?= message of "Thu, 26 Aug 2021 08:21:36 +0200")
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 Content preview:  Andreas Röhler <andreas.roehler@HIDDEN> writes: >>>
    Maybe put the Python code below at the top of some buffer and run the >>>
    test delivered below: >>> >>> # Python >>> >>> def main(): >>>     """Some
    hint""" >>>     if len(sys.argv) == 1: >> [...] 
 
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Andreas R=C3=B6hler <andreas.roehler@HIDDEN> writes:

>>> Maybe put the Python code below at the top of some buffer and run the
>>> test delivered below:
>>>
>>> # Python
>>>
>>> def main():
>>>  =C2=A0=C2=A0=C2=A0 """Some hint"""
>>>  =C2=A0=C2=A0=C2=A0 if len(sys.argv) =3D=3D 1:
>>>  =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 usage()
>>>
>>> ;; Elisp
>>> (defun forward-sexp-text ()
>>>  =C2=A0 (interactive)
>>>  =C2=A0 (goto-char 30 )
>>>  =C2=A0 (forward-sexp))
>> By that goto-char, do you mean the "S" character?
>
> No, sorry, the 5th double-quote of the triple-quoted-string.

That gives me

forward-sexp: Scan error: "Unbalanced parentheses", 40, 86

which I think is the right thing?

This bug report started with thingatpt.  What is the real thingatpt use
case that doesn't work in triple-quoted strings?

--=20
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#13973; Package emacs. Full text available.

Message received at 13973 <at> debbugs.gnu.org:


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Subject: Re: bug#13973: Subject: 24.3; thingatpt.el, end-of-sexp
To: Lars Ingebrigtsen <larsi@HIDDEN>
References: <51442486.4070100@HIDDEN> <87a6l9ufug.fsf@HIDDEN>
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On 25.08.21 12:38, Lars Ingebrigtsen wrote:
> Andreas Röhler <andreas.roehler@HIDDEN> writes:
>
>> Maybe put the Python code below at the top of some buffer and run the
>> test delivered below:
>>
>> # Python
>>
>> def main():
>>      """Some hint"""
>>      if len(sys.argv) == 1:
>>          usage()
>>
>> ;; Elisp
>> (defun forward-sexp-text ()
>>    (interactive)
>>    (goto-char 30 )
>>    (forward-sexp))
> By that goto-char, do you mean the "S" character?


No, sorry, the 5th double-quote of the triple-quoted-string.

> (It's where point
> lands in the buffer included below.)  If so, `forward-sex'
> (in Emacs 28) does the correct thing -- it moves to the end of "Some".
>
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#13973; Package emacs. Full text available.

Message received at 13973 <at> debbugs.gnu.org:


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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Andreas =?utf-8?Q?R=C3=B6hler?= <andreas.roehler@HIDDEN>
Subject: Re: bug#13973: Subject: 24.3; thingatpt.el, end-of-sexp
References: <51442486.4070100@HIDDEN> <87a6l9ufug.fsf@HIDDEN>
 <524429ba-026c-e5a6-579e-1789bd2cee1a@HIDDEN>
Date: Wed, 25 Aug 2021 12:38:55 +0200
In-Reply-To: <524429ba-026c-e5a6-579e-1789bd2cee1a@HIDDEN> ("Andreas
 =?utf-8?Q?R=C3=B6hler=22's?= message of "Mon, 23 Aug 2021 19:11:45 +0200")
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 Content preview:  Andreas Röhler <andreas.roehler@HIDDEN> writes: >
   Maybe put the Python code below at the top of some buffer and run the > test
    delivered below: > > # Python > > def main(): >     """Some hint""" >
       if len(sys.argv) == 1: >         u [...] 
 
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--=-=-=
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable

Andreas R=C3=B6hler <andreas.roehler@HIDDEN> writes:

> Maybe put the Python code below at the top of some buffer and run the
> test delivered below:
>
> # Python
>
> def main():
> =C2=A0=C2=A0=C2=A0 """Some hint"""
> =C2=A0=C2=A0=C2=A0 if len(sys.argv) =3D=3D 1:
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 usage()
>
> ;; Elisp
> (defun forward-sexp-text ()
> =C2=A0 (interactive)
> =C2=A0 (goto-char 30 )
> =C2=A0 (forward-sexp))

By that goto-char, do you mean the "S" character?  (It's where point
lands in the buffer included below.)  If so, `forward-sex'
(in Emacs 28) does the correct thing -- it moves to the end of "Some".

--=20
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

--=-=-=
Content-Type: text/x-python
Content-Disposition: inline; filename=sexp.py

# Python

def main():
    """Some hint"""
    if len(sys.argv) == 1:
        usage()

--=-=-=--
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#13973; Package emacs. Full text available.

Message received at 13973 <at> debbugs.gnu.org:


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Subject: Re: bug#13973: Subject: 24.3; thingatpt.el, end-of-sexp
To: Lars Ingebrigtsen <larsi@HIDDEN>
References: <51442486.4070100@HIDDEN> <87a6l9ufug.fsf@HIDDEN>
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On 23.08.21 03:09, Lars Ingebrigtsen wrote:
> Andreas Röhler <andreas.roehler@HIDDEN> writes:
>
>> (defun end-of-sexp ()
>>    "Move point to the end of the current sexp.
>> \[This is an internal function.]"
>>    (let ((char-syntax (char-syntax (char-after))))
>>      (if (or (eq char-syntax ?\))
>> 	    (and (eq char-syntax ?\") (in-string-p)))
>> 	(forward-char 1)
>>        (forward-sexp 1))))
>>
>> "or" asks if inside a string and calls (forward-char 1).
>>
>> This must fail with some probability with
>> triple-quoted-strings as used in Python.
>>
>> Solution:
>>
>> When inside a string, jump to (nth 8 (syntax-ppss)) and
>> call (forward-sexp 1) from there.
> (I'm going through old bug reports that unfortunately weren't resolved
> at the time.)
>
> It's not quite clear to me what the actual problem here is.

It's only abstract reasoning when looking at the code.

Maybe put the Python code below at the top of some buffer and run the 
test delivered below:

# Python

def main():
     """Some hint"""
     if len(sys.argv) == 1:
         usage()

;; Elisp
(defun forward-sexp-text ()
   (interactive)
   (goto-char 30 )
   (forward-sexp))


>   Do you have
> a test case where thingatpt does the wrong thing in Python mode?
>
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#13973; Package emacs. Full text available.
Added tag(s) moreinfo. Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 13973 <at> debbugs.gnu.org:


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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Andreas =?utf-8?Q?R=C3=B6hler?= <andreas.roehler@HIDDEN>
Subject: Re: bug#13973: Subject: 24.3; thingatpt.el, end-of-sexp
References: <51442486.4070100@HIDDEN>
Date: Mon, 23 Aug 2021 03:09:27 +0200
In-Reply-To: <51442486.4070100@HIDDEN> ("Andreas =?utf-8?Q?R=C3=B6h?=
 =?utf-8?Q?ler=22's?= message of "Sat, 16 Mar 2013 08:51:34 +0100")
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 Content preview:  Andreas Röhler <andreas.roehler@HIDDEN> writes: >
   (defun end-of-sexp () > "Move point to the end of the current sexp. > \[This
    is an internal function.]" > (let ((char-syntax (char-syntax (char-after))))
    > (if (or (eq char-syntax ?\)) > (and (eq ch [...] 
 
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Andreas R=C3=B6hler <andreas.roehler@HIDDEN> writes:

> (defun end-of-sexp ()
>   "Move point to the end of the current sexp.
> \[This is an internal function.]"
>   (let ((char-syntax (char-syntax (char-after))))
>     (if (or (eq char-syntax ?\))
> 	    (and (eq char-syntax ?\") (in-string-p)))
> 	(forward-char 1)
>       (forward-sexp 1))))
>
> "or" asks if inside a string and calls (forward-char 1).
>
> This must fail with some probability with
> triple-quoted-strings as used in Python.
>
> Solution:
>
> When inside a string, jump to (nth 8 (syntax-ppss)) and
> call (forward-sexp 1) from there.

(I'm going through old bug reports that unfortunately weren't resolved
at the time.)

It's not quite clear to me what the actual problem here is.  Do you have
a test case where thingatpt does the wrong thing in Python mode?

--=20
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#13973; Package emacs. Full text available.

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From: Stefan Monnier <monnier@HIDDEN>
To: Leo Liu <sdl.web@HIDDEN>
Subject: Re: bug#13973: Subject: 24.3; thingatpt.el, end-of-sexp
Message-ID: <jwvli9ncv4k.fsf-monnier+emacs@HIDDEN>
References: <51442486.4070100@HIDDEN> <m138vvzlb4.fsf@HIDDEN>
Date: Sat, 16 Mar 2013 09:50:04 -0400
In-Reply-To: <m138vvzlb4.fsf@HIDDEN> (Leo Liu's message of "Sat, 16 Mar
	2013 18:33:03 +0800")
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>> When inside a string, jump to (nth 8 (syntax-ppss)) and
>> call (forward-sexp 1) from there.

Sounds right, yes.

> In my experience (a while ago, I use little python these days) this
> cannot reliably goes to the end of the triple-quoted string.

That would be a bug in python-mode, then.


        Stefan
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#13973; Package emacs. Full text available.

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Subject: Re: bug#13973: Subject: 24.3; thingatpt.el, end-of-sexp
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Am 16.03.2013 11:33, schrieb Leo Liu:
> On 2013-03-16 15:51 +0800, Andreas Röhler wrote:
>> When inside a string, jump to (nth 8 (syntax-ppss)) and
>> call (forward-sexp 1) from there.
>
> In my experience (a while ago, I use little python these days) this
> cannot reliably goes to the end of the triple-quoted string.
>
> Leo
>
>
>
>
>

Indeed seems a bug in python-mode.el at this place just now.
Anyway - forward-sexp must go to the end of string from it's beginning,
a string is a balanced expression.


Best,

Andreas
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#13973; Package emacs. Full text available.

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On 2013-03-16 15:51 +0800, Andreas Röhler wrote:
> When inside a string, jump to (nth 8 (syntax-ppss)) and
> call (forward-sexp 1) from there.

In my experience (a while ago, I use little python these days) this
cannot reliably goes to the end of the triple-quoted string.

Leo
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#13973; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:


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(defun end-of-sexp ()
   "Move point to the end of the current sexp.
\[This is an internal function.]"
   (let ((char-syntax (char-syntax (char-after))))
     (if (or (eq char-syntax ?\))
	    (and (eq char-syntax ?\") (in-string-p)))
	(forward-char 1)
       (forward-sexp 1))))

"or" asks if inside a string and calls (forward-char 1).

This must fail with some probability with
triple-quoted-strings as used in Python.

Solution:

When inside a string, jump to (nth 8 (syntax-ppss)) and
call (forward-sexp 1) from there.
Acknowledgement sent to Andreas Röhler <andreas.roehler@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#13973; Package emacs. Full text available.
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Last modified: Thu, 5 May 2022 12:30:02 UTC

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