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Subject: bug#54131: 29.0.50; Flyspell incorrectly reports first word in Python f-string
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 Content preview: Given this Python file: $ cat /tmp/a.py print(f'hello world')
 Visit it and enable Flyspell: 
 Content analysis details:   (1.2 points, 10.0 required)
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Given this Python file:

$ cat /tmp/a.py=20
print(f'hello world')

Visit it and enable Flyspell:

$ emacs -Q /tmp/a.py -f flyspell-prog-mode

Flyspell then marks the string "f'hello" as incorrect, thinking it's a
misspelling of "hello".  But it shouldn't cross the string boundary.


In GNU Emacs 29.0.50 (build 59, x86_64-pc-linux-gnu, GTK+ Version 3.24.31, =
cairo version 1.16.0)
 of 2022-02-23
Repository revision: 85ad8616007e286c237bb2906d1928bb551462e7
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12014000
System Description: Debian GNU/Linux rodete

Configured using:
 'configure --enable-gcc-warnings=3Dwarn-only
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Configured features:
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Important settings:
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Major mode: Lisp Interaction

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Memory information:
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 (symbols 48 8204 1)
 (strings 32 23683 2078)
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 (vectors 16 15596)
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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Philipp Stephani <p.stephani2@HIDDEN>
Subject: bug#54131: Acknowledgement (29.0.50; Flyspell incorrectly reports
 first word in Python f-string)
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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#54131: 29.0.50; Flyspell incorrectly reports first word in Python f-string
Resent-From: Lars Ingebrigtsen <larsi@HIDDEN>
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To: Philipp Stephani <p.stephani2@HIDDEN>
Cc: 54131 <at> debbugs.gnu.org
From: Lars Ingebrigtsen <larsi@HIDDEN>
References: <wvr4y22178k4.fsf@HIDDEN>
Date: Wed, 23 Feb 2022 21:13:27 +0100
In-Reply-To: <wvr4y22178k4.fsf@HIDDEN> (Philipp Stephani's message of "Wed, 
 23 Feb 2022 19:16:11 +0100")
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Philipp Stephani <p.stephani2@HIDDEN> writes:

> Given this Python file:
>
> $ cat /tmp/a.py 
> print(f'hello world')
>
> Visit it and enable Flyspell:
>
> $ emacs -Q /tmp/a.py -f flyspell-prog-mode
>
> Flyspell then marks the string "f'hello" as incorrect, thinking it's a
> misspelling of "hello".  But it shouldn't cross the string boundary.

Hm, yes.  In this case, the mode knows that f isn't part of the
expression, but I guess we have no way of communicating that to ispell?

Skimming ispell-get-word, it looks like it uses a regexp to determine
what the word at point is, so we'd need to make some sort of framework
to allow modes to say where a string begins and ends?  Or if we want to
just do something hackish, we could make that function check
the face for font-lock-string-face and then limit based on that.  (Which
sounds simple enough.)

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

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Subject: bug#54131: 29.0.50; Flyspell incorrectly reports first word in Python f-string
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From: Philipp Stephani <p.stephani2@HIDDEN>
Date: Wed, 23 Feb 2022 21:27:04 +0100
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Am Mi., 23. Feb. 2022 um 21:13 Uhr schrieb Lars Ingebrigtsen <larsi@HIDDEN>:
>
> Philipp Stephani <p.stephani2@HIDDEN> writes:
>
> > Given this Python file:
> >
> > $ cat /tmp/a.py
> > print(f'hello world')
> >
> > Visit it and enable Flyspell:
> >
> > $ emacs -Q /tmp/a.py -f flyspell-prog-mode
> >
> > Flyspell then marks the string "f'hello" as incorrect, thinking it's a
> > misspelling of "hello".  But it shouldn't cross the string boundary.
>
> Hm, yes.  In this case, the mode knows that f isn't part of the
> expression, but I guess we have no way of communicating that to ispell?
>
> Skimming ispell-get-word, it looks like it uses a regexp to determine
> what the word at point is, so we'd need to make some sort of framework
> to allow modes to say where a string begins and ends?

Like the syntax table? (nth 8 (syntax-ppss)) gives you the beginning
of the string, and that seems to give correct results even for
f-strings.

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> From: Lars Ingebrigtsen <larsi@HIDDEN>
> Date: Wed, 23 Feb 2022 21:13:27 +0100
> Cc: 54131 <at> debbugs.gnu.org
> 
> Skimming ispell-get-word, it looks like it uses a regexp to determine
> what the word at point is, so we'd need to make some sort of framework
> to allow modes to say where a string begins and ends?  Or if we want to
> just do something hackish, we could make that function check
> the face for font-lock-string-face and then limit based on that.  (Which
> sounds simple enough.)

Our spell-checking modes aren't supposed to work on code, so they
don't pay any attention to the buffer's syntax table, and instead use
regular expressions specific to the proof-reading language to know
what can and cannot be in a word.

For program sources, flyspell-prog-mode relies on font-lock faces to
tell it where strings and comments are, so perhaps this part doesn't
work for some reason (and perhaps the root cause is in font-lock of
python-mode, not in flyspell.el per se).

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> Resent-From: Philipp Stephani <p.stephani2@HIDDEN>
> Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
> Resent-CC: bug-gnu-emacs@HIDDEN
> Resent-Sender: help-debbugs@HIDDEN
> From: Philipp Stephani <p.stephani2@HIDDEN>
> Date: Wed, 23 Feb 2022 21:27:04 +0100
> Cc: 54131 <at> debbugs.gnu.org
> 
> Am Mi., 23. Feb. 2022 um 21:13 Uhr schrieb Lars Ingebrigtsen <larsi@HIDDEN>:
> >
> > Philipp Stephani <p.stephani2@HIDDEN> writes:
> >
> > > Given this Python file:
> > >
> > > $ cat /tmp/a.py
> > > print(f'hello world')
> > >
> > > Visit it and enable Flyspell:
> > >
> > > $ emacs -Q /tmp/a.py -f flyspell-prog-mode
> > >
> > > Flyspell then marks the string "f'hello" as incorrect, thinking it's a
> > > misspelling of "hello".  But it shouldn't cross the string boundary.
> >
> > Hm, yes.  In this case, the mode knows that f isn't part of the
> > expression, but I guess we have no way of communicating that to ispell?
> >
> > Skimming ispell-get-word, it looks like it uses a regexp to determine
> > what the word at point is, so we'd need to make some sort of framework
> > to allow modes to say where a string begins and ends?
> 
> Like the syntax table? (nth 8 (syntax-ppss)) gives you the beginning
> of the string, and that seems to give correct results even for
> f-strings.

That's not how flyspell-prog-mode works, see my other message.  I
guess it doesn't want to run syntax analysis functions on the fly, as
that could be too slow (flyspell being on post-command-hook), but
instead relies on font lock that is run by the display engine anyway.

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 Content preview:  Eli Zaretskii <eliz@HIDDEN> writes: > For program sources, 
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 the root cause is in f [...] 
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Eli Zaretskii <eliz@HIDDEN> writes:

> For program sources, flyspell-prog-mode relies on font-lock faces to
> tell it where strings and comments are, so perhaps this part doesn't
> work for some reason (and perhaps the root cause is in font-lock of
> python-mode, not in flyspell.el per se).

I didn't know about flyspell-prog-mode, but it does indeed do the right
thing here.  (I've now mentioned the mode in the flyspell-mode doc
string.)

But `M-$' does not do the right thing -- if you `M-$' on f'hello, it
tries to correct the whole thing.

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

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 > But `M-$' does not do the right thing -- if you `M-$' on f'hello, it
 > tries to correct the whole thing.

Try with 'ispell-comment-or-string-at-point'.

martin

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From: Eli Zaretskii <eliz@HIDDEN>
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> From: Lars Ingebrigtsen <larsi@HIDDEN>
> Cc: p.stephani2@HIDDEN,  54131 <at> debbugs.gnu.org
> Date: Thu, 24 Feb 2022 10:12:58 +0100
> 
> Eli Zaretskii <eliz@HIDDEN> writes:
> 
> > For program sources, flyspell-prog-mode relies on font-lock faces to
> > tell it where strings and comments are, so perhaps this part doesn't
> > work for some reason (and perhaps the root cause is in font-lock of
> > python-mode, not in flyspell.el per se).
> 
> I didn't know about flyspell-prog-mode, but it does indeed do the right
> thing here.  (I've now mentioned the mode in the flyspell-mode doc
> string.)

That's strange, because the OP explicitly invoked flyspell-prog-mode,
so how come it didn't work for Philipp, but did for you?

> But `M-$' does not do the right thing -- if you `M-$' on f'hello, it
> tries to correct the whole thing.

Maybe we should have a key binding for
ispell-comment-or-string-at-point, and/or maybe
ispell-comments-and-strings and flyspell-prog-mode should rebind M-$
to ispell-comment-or-string-at-point.

Message sent to bug-gnu-emacs@HIDDEN:

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From: Visuwesh <visuweshm@HIDDEN>
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Date: Thu, 24 Feb 2022 16:53:48 +0530
In-Reply-To: <837d9ksh0w.fsf@HIDDEN> (Eli Zaretskii's message of "Thu, 24 Feb
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[=E0=AE=B5=E0=AE=BF=E0=AE=AF=E0=AE=BE=E0=AE=B4=E0=AE=A9=E0=AF=8D, =E0=AE=AA=
=E0=AE=BF=E0=AE=AA=E0=AF=8D=E0=AE=B0=E0=AE=B5=E0=AE=B0=E0=AE=BF 24 2022] El=
i Zaretskii wrote:

>> From: Lars Ingebrigtsen <larsi@HIDDEN>
>> Cc: p.stephani2@HIDDEN,  54131 <at> debbugs.gnu.org
>> Date: Thu, 24 Feb 2022 10:12:58 +0100
>>=20
>> Eli Zaretskii <eliz@HIDDEN> writes:
>>=20
>> > For program sources, flyspell-prog-mode relies on font-lock faces to
>> > tell it where strings and comments are, so perhaps this part doesn't
>> > work for some reason (and perhaps the root cause is in font-lock of
>> > python-mode, not in flyspell.el per se).
>>=20
>> I didn't know about flyspell-prog-mode, but it does indeed do the right
>> thing here.  (I've now mentioned the mode in the flyspell-mode doc
>> string.)
>
> That's strange, because the OP explicitly invoked flyspell-prog-mode,
> so how come it didn't work for Philipp, but did for you?
>
>> But `M-$' does not do the right thing -- if you `M-$' on f'hello, it
>> tries to correct the whole thing.
>
> Maybe we should have a key binding for
> ispell-comment-or-string-at-point, and/or maybe
> ispell-comments-and-strings and flyspell-prog-mode should rebind M-$
> to ispell-comment-or-string-at-point.

I misspell parts of a symbol quite often so rebinding M-$ to a command
that NOOPs when the point is not over a comment/string would end up
annoying, IMO.  I am not sure how common this usecase is though.

Message sent to bug-gnu-emacs@HIDDEN:

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 Content preview:  Visuwesh <visuweshm@HIDDEN> writes: > I misspell parts
 of a symbol quite often so rebinding M-$ to a command > that NOOPs when the
 point is not over a comment/string would end up > annoying, IMO. I am not
 sure how common this usecase is [...] 
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Visuwesh <visuweshm@HIDDEN> writes:

> I misspell parts of a symbol quite often so rebinding M-$ to a command
> that NOOPs when the point is not over a comment/string would end up
> annoying, IMO.  I am not sure how common this usecase is though.

I think it's pretty common.  I think a new command that does what
ispell-comment-or-string-at-point does if we're in a comment/string and
what ispell-word does otherwise might be nice.

And flyspell-prog-mode could rebind `M-$', as Eli suggests, but to that
new command.

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

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