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Subject: bug#24542: 25.1.50; The symbol `@' and sexp scanning
Resent-From: Michael Heerdegen <michael_heerdegen@HIDDEN>
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From: Michael Heerdegen <michael_heerdegen@HIDDEN>
Date: Sun, 25 Sep 2016 19:42:17 +0200
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Hi,

the following breaks my "el-search" package when searching in
"skeleton.el".  It assumes that calling `scan-sexps' works at the start
of any sexp.

Recipe: in emacs -Q,

insert

    (eq element '@)

in an elisp mode buffer (e.g. scratch).  Put point at the quote or the
"@".  Eval

    (goto-char (scan-sexps (point) 1))

and you get an error like:


Debugger entered--Lisp error: (scan-error "Containing expression ends prematurely" 15 16)
  scan-sexps(13 1)
  (goto-char (scan-sexps (point) 1))
  eval((goto-char (scan-sexps (point) 1)) nil)
  eval-expression((goto-char (scan-sexps (point) 1)) nil)
  funcall-interactively(eval-expression (goto-char (scan-sexps (point) 1)) nil)
  call-interactively(eval-expression nil nil)
  command-execute(eval-expression)


I think `scan-sexps' should not error.  FWIW, if I add one more sexp to
the list after "'@" (different from "'@"), there is no error.


TIA,

Michael.




In GNU Emacs 25.1.50.2 (x86_64-pc-linux-gnu, GTK+ Version 3.21.5)
 of 2016-09-23 built on drachen
Repository revision: 14c36d76df035faa127580d706a0564f4e496991
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description:	Debian GNU/Linux testing (stretch)

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GSETTINGS NOTIFY
LIBXML2 FREETYPE XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LC_ALL: de_DE.utf8
  value of $LC_COLLATE: C
  value of $LC_TIME: C
  value of $LANG: de_DE.utf8
  locale-coding-system: utf-8-unix

Major mode: Emacs-Lisp

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To: Michael Heerdegen <michael_heerdegen@HIDDEN>
Subject: bug#24542: Acknowledgement (25.1.50; The symbol `@' and sexp
 scanning)
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Date: Sun, 25 Sep 2016 17:43:02 +0000

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Subject: bug#24542: 25.1.50; The symbol `@' and sexp scanning
Resent-From: Michael Heerdegen <michael_heerdegen@HIDDEN>
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From: Michael Heerdegen <michael_heerdegen@HIDDEN>
References: <8760pj27wm.fsf@HIDDEN>
Date: Mon, 02 Jan 2017 17:58:48 +0100
In-Reply-To: <8760pj27wm.fsf@HIDDEN> (Michael Heerdegen's message of "Sun, 25
 Sep 2016 19:42:17 +0200")
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Michael Heerdegen <michael_heerdegen@HIDDEN> writes:

> insert
>
>     (eq element '@)
>
> in an elisp mode buffer (e.g. scratch).  Put point at the quote or the
> "@".  Eval
>
>     (goto-char (scan-sexps (point) 1))
>
> and you get an error like:
>
>
> Debugger entered--Lisp error: (scan-error "Containing expression ends
> prematurely" 15 16)

It seems that you can replace the symbol `@' in this recipe with any
symbol whose name has the form "@+", i.e. `@@' or `@@@' or...  When the
symbol contains only one character different from "@", it doesn't seem
to happen.


Michael.

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Subject: bug#24542: 25.1.50; The symbol `@' and sexp scanning
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From: npostavs@HIDDEN
References: <8760pj27wm.fsf@HIDDEN> <87o9zptn3r.fsf@HIDDEN>
Date: Mon, 02 Jan 2017 15:37:28 -0500
In-Reply-To: <87o9zptn3r.fsf@HIDDEN> (Michael Heerdegen's message of "Mon, 02
 Jan 2017 17:58:48 +0100")
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Michael Heerdegen <michael_heerdegen@HIDDEN> writes:

> Michael Heerdegen <michael_heerdegen@HIDDEN> writes:
>
>> insert
>>
>>     (eq element '@)
>>
>> in an elisp mode buffer (e.g. scratch).  Put point at the quote or the
>> "@".  Eval
>>
>>     (goto-char (scan-sexps (point) 1))
>>
>> and you get an error like:
>>
>>
>> Debugger entered--Lisp error: (scan-error "Containing expression ends
>> prematurely" 15 16)
>
> It seems that you can replace the symbol `@' in this recipe with any
> symbol whose name has the form "@+", i.e. `@@' or `@@@' or...  When the
> symbol contains only one character different from "@", it doesn't seem
> to happen.

`@' has the prefix syntax flag, the elisp manual says `(elisp) Syntax Flags':

   * `p' identifies an additional prefix character for Lisp syntax.
     These characters are treated as whitespace when they appear between
                          ^^^^^^^^^^^^^^^^^^^^^
     expressions.  When they appear within an expression, they are
     handled according to their usual syntax classes.

So (eq element '@) acts the same as (eq element ' ).  This could be
changed with something the following patch, but I'm not sure if it's the
right thing for non-Lisp languages...

diff --git i/src/syntax.c w/src/syntax.c
index 0ee1c74..253d3fb 100644
--- i/src/syntax.c
+++ w/src/syntax.c
@@ -2681,7 +2681,16 @@ scan_lists (EMACS_INT from, EMACS_INT count, EMACS_INT depth, bool sexpflag)
 	    }
 
 	  if (prefix)
-	    continue;
+            {
+              int next_c = FETCH_CHAR_AS_MULTIBYTE (from_byte);
+              int next_syntax = SYNTAX_WITH_FLAGS (next_c);
+              bool next_prefix = SYNTAX_FLAGS_PREFIX (next_syntax);
+              enum syntaxcode next_code = syntax_multibyte (next_c, multibyte_symbol_p);
+              if (next_prefix
+                  || next_code == Ssymbol
+                  || next_code == Sword)
+                continue;
+            }
 
 	  switch (code)
 	    {

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Date: Tue, 03 Jan 2017 13:46:26 +0100
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npostavs@HIDDEN writes:

> >> insert
> >>
> >>     (eq element '@)
> >>
> >> in an elisp mode buffer (e.g. scratch).  Put point at the quote or the
> >> "@".  Eval
> >>
> >>     (goto-char (scan-sexps (point) 1))
> >>
> >> and you get an error like:
> >>
> >>
> >> Debugger entered--Lisp error: (scan-error "Containing expression ends
> >> prematurely" 15 16)
> >
> > It seems that you can replace the symbol `@' in this recipe with any
> > symbol whose name has the form "@+", i.e. `@@' or `@@@' or...  When the
> > symbol contains only one character different from "@", it doesn't seem
> > to happen.
>
> `@' has the prefix syntax flag, the elisp manual says `(elisp) Syntax Flags':
>
>    * `p' identifies an additional prefix character for Lisp syntax.
>      These characters are treated as whitespace when they appear between
>                           ^^^^^^^^^^^^^^^^^^^^^
>      expressions.  When they appear within an expression, they are
>      handled according to their usual syntax classes.
>
> So (eq element '@) acts the same as (eq element ' ).

I don't agree with your interpretation.  `@' is an (textual
representation of an) expression in the above example, so "these
characters" don't "appear between expressions" in this case.  Could be
that this wording led to a wrong implementation, however.

> This could be changed with something the following patch, but I'm not
> sure if it's the right thing for non-Lisp languages...

> diff --git i/src/syntax.c w/src/syntax.c
> index 0ee1c74..253d3fb 100644
> --- i/src/syntax.c
> +++ w/src/syntax.c
> @@ -2681,7 +2681,16 @@ scan_lists (EMACS_INT from, EMACS_INT count, EMACS_INT depth, bool sexpflag)
>  	    }
>  
>  	  if (prefix)
> -	    continue;
> +            {
> +              int next_c = FETCH_CHAR_AS_MULTIBYTE (from_byte);
> +              int next_syntax = SYNTAX_WITH_FLAGS (next_c);
> +              bool next_prefix = SYNTAX_FLAGS_PREFIX (next_syntax);
> +              enum syntaxcode next_code = syntax_multibyte (next_c, multibyte_symbol_p);
> +              if (next_prefix
> +                  || next_code == Ssymbol
> +                  || next_code == Sword)
> +                continue;
> +            }
>  
>  	  switch (code)
>  	    {

Thanks for the patch.  Can anyone judge whether we can do this?


Thanks,

Michael.

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Date: Tue, 03 Jan 2017 08:03:54 -0500
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Michael Heerdegen <michael_heerdegen@HIDDEN> writes:
>> `@' has the prefix syntax flag, the elisp manual says `(elisp) Syntax Flags':
>>
>>    * `p' identifies an additional prefix character for Lisp syntax.
>>      These characters are treated as whitespace when they appear between
>>                           ^^^^^^^^^^^^^^^^^^^^^
>>      expressions.  When they appear within an expression, they are
>>      handled according to their usual syntax classes.
>>
>> So (eq element '@) acts the same as (eq element ' ).
>
> I don't agree with your interpretation.  `@' is an (textual
> representation of an) expression in the above example, so "these
> characters" don't "appear between expressions" in this case.  Could be
> that this wording led to a wrong implementation, however.

Well, it's a bit ambiguous whether a character sequence composed soley
of prefix characters should be considered an expression or not.
Obviously the end result is wrong for Lisp, i.e., does not correspond
with what `read' thinks.

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 Jan 2017 13:46:26 +0100")
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Michael Heerdegen <michael_heerdegen@HIDDEN> writes:

> Thanks for the patch.  Can anyone judge whether we can do this?

I tried the patch, and it fixes the

(setq a '@)

problem for me.  I don't really have a great overview of where
scan_lists is used for -- it seems like a very general solution to a
very specific problem.

Does anybody have any comments here?

diff --git a/src/syntax.c b/src/syntax.c
index 7f0fc341f6..10912dd5f2 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -2693,7 +2693,17 @@ scan_lists (EMACS_INT from0, EMACS_INT count, EMACS_INT depth, bool sexpflag)
 	    }
 
 	  if (prefix)
-	    continue;
+            {
+              int next_c = FETCH_CHAR_AS_MULTIBYTE (from_byte);
+              int next_syntax = SYNTAX_WITH_FLAGS (next_c);
+              bool next_prefix = SYNTAX_FLAGS_PREFIX (next_syntax);
+              enum syntaxcode next_code =
+		syntax_multibyte (next_c, multibyte_symbol_p);
+              if (next_prefix
+                  || next_code == Ssymbol
+                  || next_code == Sword)
+                continue;
+            }
 
 	  switch (code)
 	    {


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

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> From: Lars Ingebrigtsen <larsi@HIDDEN>
> Date: Fri, 04 Sep 2020 15:05:36 +0200
> Cc: 24542 <at> debbugs.gnu.org, npostavs@HIDDEN
> 
> I tried the patch, and it fixes the
> 
> (setq a '@)
> 
> problem for me.  I don't really have a great overview of where
> scan_lists is used for -- it seems like a very general solution to a
> very specific problem.
> 
> Does anybody have any comments here?

Stefan, any comments?

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>> Does anybody have any comments here?
> Stefan, any comments?

Checking for an immediately following word or symbol syntax doesn't see
sufficient if we consider cases like:

   '(sgasfg)

or

   , (sfgsdf)

or

   ,@ ;; entertained yet?
   \)

and then we have the really fun stuff like:

   (foo '@ bar)

vs

   (foo ,@ bar)

So maybe a better solution is a syntax-propertize rule which
distinguishes "@ after comma" from "@ not after comma"?


        Stefan

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