* [PATCH] Fix a possibly problematic string comparison
@ 2023-08-27 21:43 Rudolf Adamkovič
2023-08-28 8:45 ` Ihor Radchenko
2024-05-09 9:00 ` Ihor Radchenko
0 siblings, 2 replies; 6+ messages in thread
From: Rudolf Adamkovič @ 2023-08-27 21:43 UTC (permalink / raw)
To: emacs-orgmode; +Cc: Rudolf Adamkovič
* lisp/org-table.el (org-table-make-reference): Replace 'eq' with
'string-empty-p' to resolve "Warning: 'eq' called with literal string
that may never match" issued on every 'make' invocation.
---
lisp/org-table.el | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lisp/org-table.el b/lisp/org-table.el
index f5a433c7d..b82749469 100644
--- a/lisp/org-table.el
+++ b/lisp/org-table.el
@@ -2864,7 +2864,7 @@ list, `literal' is for the format specifier L."
(if lispp
(if (eq lispp 'literal)
elements
- (if (and (eq elements "") (not keep-empty))
+ (if (and (string-empty-p elements) (not keep-empty))
""
(prin1-to-string
(if numbers (string-to-number elements) elements))))
--
2.41.0
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [PATCH] Fix a possibly problematic string comparison
2023-08-27 21:43 [PATCH] Fix a possibly problematic string comparison Rudolf Adamkovič
@ 2023-08-28 8:45 ` Ihor Radchenko
2023-08-29 0:02 ` Rudolf Adamkovič
2024-05-09 9:00 ` Ihor Radchenko
1 sibling, 1 reply; 6+ messages in thread
From: Ihor Radchenko @ 2023-08-28 8:45 UTC (permalink / raw)
To: Rudolf Adamkovič; +Cc: emacs-orgmode
Rudolf Adamkovič <salutis@me.com> writes:
> * lisp/org-table.el (org-table-make-reference): Replace 'eq' with
> 'string-empty-p' to resolve "Warning: 'eq' called with literal string
> that may never match" issued on every 'make' invocation.
>
> - (if (and (eq elements "") (not keep-empty))
> + (if (and (string-empty-p elements) (not keep-empty))
This is not as trivial. Applying this patch will break tests.
One needs to carefully examine the org-table logic to fix this
particular warning.
--
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] Fix a possibly problematic string comparison
2023-08-28 8:45 ` Ihor Radchenko
@ 2023-08-29 0:02 ` Rudolf Adamkovič
2023-08-29 5:10 ` Ihor Radchenko
0 siblings, 1 reply; 6+ messages in thread
From: Rudolf Adamkovič @ 2023-08-29 0:02 UTC (permalink / raw)
To: Ihor Radchenko; +Cc: emacs-orgmode
Ihor Radchenko <yantar92@posteo.net> writes:
> This is not as trivial. Applying this patch will break tests.
> One needs to carefully examine the org-table logic to fix this
> particular warning.
Wow! You are right. How is that even possible? In other words, what
value (of 'elements') can possibly be object-equal to a literal "" but
not string-equal to the same literal "" or vice versa?
Rudy
--
"Logic is a science of the necessary laws of thought, without which no
employment of the understanding and the reason takes place."
-- Immanuel Kant, 1785
Rudolf Adamkovič <salutis@me.com> [he/him]
Studenohorská 25
84103 Bratislava
Slovakia
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] Fix a possibly problematic string comparison
2023-08-29 0:02 ` Rudolf Adamkovič
@ 2023-08-29 5:10 ` Ihor Radchenko
2023-08-29 23:56 ` Rudolf Adamkovič
0 siblings, 1 reply; 6+ messages in thread
From: Ihor Radchenko @ 2023-08-29 5:10 UTC (permalink / raw)
To: Rudolf Adamkovič; +Cc: emacs-orgmode
Rudolf Adamkovič <salutis@me.com> writes:
> Ihor Radchenko <yantar92@posteo.net> writes:
>
>> This is not as trivial. Applying this patch will break tests.
>> One needs to carefully examine the org-table logic to fix this
>> particular warning.
>
> Wow! You are right. How is that even possible? In other words, what
> value (of 'elements') can possibly be object-equal to a literal "" but
> not string-equal to the same literal "" or vice versa?
This is not what is happening.
- (if (and (eq elements "") (not keep-empty))
(eq elements "") is always nil - the warning is right. We never enter
this branch of `if'.
+ (if (and (string-empty-p elements) (not keep-empty))
After the patch, we do enter this branch of `if', but it breaks tests.
So, it is not just an innocent warning - it reveals a fault in logic
elsewhere in the code.
--
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] Fix a possibly problematic string comparison
2023-08-29 5:10 ` Ihor Radchenko
@ 2023-08-29 23:56 ` Rudolf Adamkovič
0 siblings, 0 replies; 6+ messages in thread
From: Rudolf Adamkovič @ 2023-08-29 23:56 UTC (permalink / raw)
To: Ihor Radchenko; +Cc: emacs-orgmode
Thank you for the explanation!
Given the complexity of the caller, that is
the `org-table-eval-formula' function, as
well as, the fact that I have yet to learn
about the spreadsheet functionality, I am
backing away from this bugfix.
Sorry for the noise.
Rudy
--
"Programming reliably -- must be an activity
of an undeniably mathematical nature […] You
see, mathematics is about thinking, and doing
mathematics is always trying to think as well
as possible." -- Edsger W. Dijkstra, 1981
Rudolf Adamkovič <salutis@me.com> [he/him]
Studenohorská 25
84103 Bratislava
Slovakia
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] Fix a possibly problematic string comparison
2023-08-27 21:43 [PATCH] Fix a possibly problematic string comparison Rudolf Adamkovič
2023-08-28 8:45 ` Ihor Radchenko
@ 2024-05-09 9:00 ` Ihor Radchenko
1 sibling, 0 replies; 6+ messages in thread
From: Ihor Radchenko @ 2024-05-09 9:00 UTC (permalink / raw)
To: Rudolf Adamkovič; +Cc: emacs-orgmode
Rudolf Adamkovič <salutis@me.com> writes:
> * lisp/org-table.el (org-table-make-reference): Replace 'eq' with
> 'string-empty-p' to resolve "Warning: 'eq' called with literal string
> that may never match" issued on every 'make' invocation.
Handled, on main.
https://git.savannah.gnu.org/cgit/emacs/org-mode.git/commit/?id=bd5665e01
I went with the non-breaking change.
--
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>
^ permalink raw reply [flat|nested] 6+ messages in thread
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2023-08-27 21:43 [PATCH] Fix a possibly problematic string comparison Rudolf Adamkovič
2023-08-28 8:45 ` Ihor Radchenko
2023-08-29 0:02 ` Rudolf Adamkovič
2023-08-29 5:10 ` Ihor Radchenko
2023-08-29 23:56 ` Rudolf Adamkovič
2024-05-09 9:00 ` Ihor Radchenko
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