* Why does this re-search forward fail?
@ 2021-04-20 13:56 Arthur Miller
2021-04-20 14:13 ` Andreas Schwab
2021-04-20 14:49 ` Stefan Monnier
0 siblings, 2 replies; 5+ messages in thread
From: Arthur Miller @ 2021-04-20 13:56 UTC (permalink / raw)
To: emacs-devel
[-- Attachment #1: Type: text/plain, Size: 1557 bytes --]
Hello,
in rare and spare moments when I am not feeding the cutiest best of all
cute beasts or changing her diapers, I was playing with a little idea to
hide org-babel markers in my init file. I wrote a small minor mode for
this, which I have attached in this mail. There is a small problem with
the loop, where the main action is happening:
#+begin_src emacs-lisp
(while (re-search-forward hbm--src-marker-re (eobp) t)
(hbm--update-line visibility))
#+end_src
The RE I search for is:
(defvar hbm--src-marker-re "^[ \t]*#\\+\\|begin_src\\|end_src")
What is happeneing is that for some strange reason, the search jumps
over some lines or stop working. If I disable/enable the mode, same
lines that failed, work.
I also wrote a small aritificial test, that will generate 200 src blocks
in a test file, and what I see there is that search fails after ~ 55
blocks, every time. Since all 200 blocks are machine generated I see no
reason why search would fail.
I also tested to iterate through the file with more explicit loop that
went line by line through entire line, but with same result.
#+begin-src emacs-lisp
(defun hbm--update-markers (visibility)
(save-excursion
(goto-char (point-min))
(with-silent-modifications
(while (not (eobp))
(beginning-of-line)
(when (re-search-forward hbm--src-marker-re (eobp) t)
(hbm--update-line visibility))
(forward-line)))))
#+end_src
Any idea?
The Emacs at hand is 27.1 (build 1, x86_64-w64-mingw32) of
2020-08-21. The test was done with -Q option.
[-- Attachment #2: ob-hide-markers.el --]
[-- Type: application/emacs-lisp, Size: 4953 bytes --]
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Why does this re-search forward fail?
2021-04-20 13:56 Why does this re-search forward fail? Arthur Miller
@ 2021-04-20 14:13 ` Andreas Schwab
2021-04-20 14:55 ` Arthur Miller
2021-04-20 14:49 ` Stefan Monnier
1 sibling, 1 reply; 5+ messages in thread
From: Andreas Schwab @ 2021-04-20 14:13 UTC (permalink / raw)
To: Arthur Miller; +Cc: emacs-devel
On Apr 20 2021, Arthur Miller wrote:
> The RE I search for is:
>
> (defvar hbm--src-marker-re "^[ \t]*#\\+\\|begin_src\\|end_src")
What is that regexp supposed to match? Why is it not defined like this:
(defvar hbm--src-marker-re "^[ \t]*#\\+\\(begin_src\\|end_src\\)")
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1
"And now for something completely different."
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Why does this re-search forward fail?
2021-04-20 14:13 ` Andreas Schwab
@ 2021-04-20 14:55 ` Arthur Miller
0 siblings, 0 replies; 5+ messages in thread
From: Arthur Miller @ 2021-04-20 14:55 UTC (permalink / raw)
To: Andreas Schwab; +Cc: emacs-devel
Andreas Schwab <schwab@linux-m68k.org> writes:
> On Apr 20 2021, Arthur Miller wrote:
>
>> The RE I search for is:
>>
>> (defvar hbm--src-marker-re "^[ \t]*#\\+\\|begin_src\\|end_src")
>
> What is that regexp supposed to match?
Just #+begin_src or #+end_src
preceded by blanks, just spaces and tabs.
> Why is it not defined like this:
>
> (defvar hbm--src-marker-re "^[ \t]*#\\+\\(begin_src\\|end_src\\)")
I think I had it so at some time, but it didn't worked for some reason,
or it was same problem. I don't remember, but I went away from it. I
just tried again; it made no difference. In test.org I still get first
55 blocks processed.
Anyway thanks, I think it is more correct to group it with '(' and ')'.
/a
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Why does this re-search forward fail?
2021-04-20 13:56 Why does this re-search forward fail? Arthur Miller
2021-04-20 14:13 ` Andreas Schwab
@ 2021-04-20 14:49 ` Stefan Monnier
2021-04-20 16:46 ` Arthur Miller
1 sibling, 1 reply; 5+ messages in thread
From: Stefan Monnier @ 2021-04-20 14:49 UTC (permalink / raw)
To: Arthur Miller; +Cc: emacs-devel
> (while (re-search-forward hbm--src-marker-re (eobp) t)
I don't know about your particular problem but the call above looks
wrong in its `limit` argument which is supposed to be either nil or
a position whereas `eobp` returns a boolean (i.e. either nil or t).
Stefan
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Why does this re-search forward fail?
2021-04-20 14:49 ` Stefan Monnier
@ 2021-04-20 16:46 ` Arthur Miller
0 siblings, 0 replies; 5+ messages in thread
From: Arthur Miller @ 2021-04-20 16:46 UTC (permalink / raw)
To: Stefan Monnier; +Cc: emacs-devel
Stefan Monnier <monnier@iro.umontreal.ca> writes:
>> (while (re-search-forward hbm--src-marker-re (eobp) t)
>
> I don't know about your particular problem but the call above looks
> wrong in its `limit` argument which is supposed to be either nil or
> a position whereas `eobp` returns a boolean (i.e. either nil or t).
Indeed. I ment (point-max) but had something else in m head when I wrote
it.
Thanks.
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2021-04-20 16:46 UTC | newest]
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2021-04-20 13:56 Why does this re-search forward fail? Arthur Miller
2021-04-20 14:13 ` Andreas Schwab
2021-04-20 14:55 ` Arthur Miller
2021-04-20 14:49 ` Stefan Monnier
2021-04-20 16:46 ` Arthur Miller
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