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Subject: bug#21840: 24.5; semantic analysis of python files is broken by strings that end in backslash
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Python string literals that end in a backslash cause Semantic's parser
to halt and not recognize anything further in the buffer.  I personally
ran across this because I frequently use helm-semantic-or-imenu, but can
be demonstrated equally well by semantic-complete-jump-local or anything
else that makes use of the buffer's symbol list.

The trivial way to reproduce this is to put the string literal "\\" at
the top of a Python buffer and then invoke semantic in one of the ways
just mentioned and notice that nothing is picked up.  You can move the
backslash literal down in the file and see every symbol up to the point
where it is placed.



In GNU Emacs 24.5.1 (x86_64-apple-darwin13.4.0, NS apple-appkit-1265.21)
of 2015-04-10 on builder10-9.porkrind.org
Windowing system distributor `Apple', version 10.3.1404
Configured using:
`configure --with-ns '--enable-locallisppath=3D/Library/Application
Support/Emacs/${version}/site-lisp:/Library/Application
Support/Emacs/site-lisp''

Important settings:
  locale-coding-system: utf-8-unix

Major mode: Python

Minor modes in effect:
  jedi-mode: t
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Recent messages:
Mark set [2 times]
Saving file =
/Users/glyph/Projects/Twisted/twisted/internet/test/test_endpoints.py...
Wrote =
/Users/glyph/Projects/Twisted/twisted/internet/test/test_endpoints.py
Mark set [3 times]
Saving file =
/Users/glyph/Projects/Twisted/twisted/internet/test/test_endpoints.py...
Wrote =
/Users/glyph/Projects/Twisted/twisted/internet/test/test_endpoints.py
Mark set
"Beep."
Quit
"Beep."
Quit

Load-path shadows:
/Users/glyph/.emacs.d/elpa/helm-20151028.327/helm-multi-match hides =
/Users/glyph/.emacs.d/elpa/helm-core-20151024.2233/helm-multi-match

Features:
(shadow sort mail-extr semantic/complete eieio-opt find-func emacsbug
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semantic/dep semantic/wisent/python-wy semantic/wisent
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Memory information:
((conses 16 1026645 103760)
(symbols 48 50999 14)
(miscs 40 2212 1016)
(strings 32 133794 14262)
(string-bytes 1 4110532)
(vectors 16 54622)
(vector-slots 8 1559457 187147)
(floats 8 753 1789)
(intervals 56 121346 2669)
(buffers 960 34))

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X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Glyph Lefkowitz <glyph@HIDDEN>
Subject: bug#21840: Acknowledgement (24.5; semantic analysis of python
 files is broken by strings that end in backslash)
Message-ID: <handler.21840.B.14467762323174.ack <at> debbugs.gnu.org>
References: <F9F51B47-4DF3-4AA6-95CF-C15F9DEAE9D7@HIDDEN>
X-Gnu-PR-Message: ack 21840
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Reply-To: 21840 <at> debbugs.gnu.org
Date: Fri, 06 Nov 2015 02:18:02 +0000

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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#21840: 24.5; semantic analysis of python files is broken by strings that end in backslash
Resent-From: Lars Ingebrigtsen <larsi@HIDDEN>
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From: Lars Ingebrigtsen <larsi@HIDDEN>
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Date: Thu, 03 Dec 2020 11:46:06 +0100
In-Reply-To: <F9F51B47-4DF3-4AA6-95CF-C15F9DEAE9D7@HIDDEN> (Glyph
 Lefkowitz's message of "Thu, 5 Nov 2015 18:16:32 -0800")
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Glyph Lefkowitz <glyph@HIDDEN> writes:

> Python string literals that end in a backslash cause Semantic's parser
> to halt and not recognize anything further in the buffer.  I personally
> ran across this because I frequently use helm-semantic-or-imenu, but can
> be demonstrated equally well by semantic-complete-jump-local or anything
> else that makes use of the buffer's symbol list.
>
> The trivial way to reproduce this is to put the string literal "\\" at
> the top of a Python buffer and then invoke semantic in one of the ways
> just mentioned and notice that nothing is picked up.  You can move the
> backslash literal down in the file and see every symbol up to the point
> where it is placed.

(This bug report unfortunately got no response at the time.)

Do you have a step-by-step recipe to reproduce this bug, starting from
"emacs -Q"?

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

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I don't know how to force semantic to fully reparse a file, I just =
observe its behavior in response to idle times.

Here's a test file you can use though, if you know how to do that:


def a(v):
    "test"

def x():
    "test"
    a(b"\\")

def y():
    "test"

def z():
    "test"


Comment and uncomment the 'a(b"\\")' line and let semantic get around to =
reparsing the buffer, however it decides to do that, and (mapcar 'car =
(semantic-fetch-tags)) will  return ("a" "x") rather than the expected =
("a" "x" "y" "z").  However, it seems like there's tons of cache state =
somewhere that I can't easily clear out because it randomly seems to =
fluctuate between doing what I expect, returning "nil", and returning a =
stale copy of the symbols (including stuff added and then removed =
entirely from the bottom of the buffer).

Sadly, given that I don't use semantic any more (specifically because of =
this type of inscrutable unreliability) I don't have any more time for =
debugging this.  Thanks for following up and good luck!

-g

> On Dec 3, 2020, at 2:46 AM, Lars Ingebrigtsen <larsi@HIDDEN> wrote:
>=20
> Glyph Lefkowitz <glyph@HIDDEN> writes:
>=20
>> Python string literals that end in a backslash cause Semantic's =
parser
>> to halt and not recognize anything further in the buffer.  I =
personally
>> ran across this because I frequently use helm-semantic-or-imenu, but =
can
>> be demonstrated equally well by semantic-complete-jump-local or =
anything
>> else that makes use of the buffer's symbol list.
>>=20
>> The trivial way to reproduce this is to put the string literal "\\" =
at
>> the top of a Python buffer and then invoke semantic in one of the =
ways
>> just mentioned and notice that nothing is picked up.  You can move =
the
>> backslash literal down in the file and see every symbol up to the =
point
>> where it is placed.
>=20
> (This bug report unfortunately got no response at the time.)
>=20
> Do you have a step-by-step recipe to reproduce this bug, starting from
> "emacs -Q"?
>=20
> --=20
> (domestic pets only, the antidote for overdose, milk.)
>   bloggy blog: http://lars.ingebrigtsen.no

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Glyph <glyph@HIDDEN> writes:

> I don't know how to force semantic to fully reparse a file, I just
> observe its behavior in response to idle times.

A complete recipe, starting from "emacs -Q", would be helpful.

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

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