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From: Visuwesh <visuweshm@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 56323@debbugs.gnu.org
Subject: bug#56323: 29.0.50; [v2] Add new customisable phonetic Tamil input method
Date: Sat, 02 Jul 2022 14:10:07 +0530	[thread overview]
Message-ID: <874jzzkivs.fsf@gmail.com> (raw)
In-Reply-To: <83fsjjdiik.fsf@gnu.org> (Eli Zaretskii's message of "Sat, 02 Jul 2022 11:29:55 +0300")

[சனி ஜூலை 02, 2022] Eli Zaretskii wrote:

>> From: Visuwesh <visuweshm@gmail.com>
>> Cc: 56323@debbugs.gnu.org
>> Date: Sat, 02 Jul 2022 13:41:17 +0530
>> 
>> >   (defun sort-by-codepoint (c1 c2)
>> >     (< (string-to-char c1) (string-to-char c2)))
>> >
>> >   (let ((core-consonants '("க" "ங" "ச" "ஞ" "ட" "ண" "த"
>> > 			   "ந" "ப" "ம" "ய" "ர" "ல"
>> > 			   "வ" "ழ" "ள" "ற" "ன")))
>> >
>> >  (sort core-consonants 'sort-by-codepoint))
>> >   => ("க" "ங" "ச" "ஞ" "ட" "ண" "த" "ந" "ன" "ப" "ம" "ய" "ர" "ற" "ல" "ள" "ழ" "வ")
>> >
>> > (To understand why, read the doc string of 'sort' carefully, where it
>> > explains what is expected from PREDICATE.)
>> 
>> Unfortunately not, since it jumbles up the list.  The desired outcome is
>> the same list.
>
> But we already established that you need to break the list in two, and
> always sort any member of one of the two sub-lists before any member
> of the other sub-list.  I then suggested to use string-lessp _within_
> each sub-list, but you said it still yielded a wrong order for some
> reason.
>

Yes, I hope I made my point clear below.

> So when you now return to the issue of splitting the list in two, and
> show how sorting the full list doesn't work, you make a step back: we
> already established the list cannot be sorted as a single list.

I think I might not have made my point clear: the sort function above
sorts one of the sub-lists.

> The only remaining issue, AFAIU, is why string-lessp is not good
> enough for sorting within each sub-list.

It is not good enough for each sub-list for the same reason: the order
produced by string-lessp is not the same as the actual order.

I will try to explain the situation using the regular English alphabets
and the extra letter þ (which was used in place of "th" AFAIU).

The core English alphabets are a-z then we have some extra alphabets
like the þ above.  When we have a list containing _both_ a-z and þ, the
order produced by string-lessp is wrong.  To work around this issue, we
decided to break the list into two.  I think we were on the same page
till here.

When I did as you suggested and broke the list into two -- a-z and þ --
and sorted the sub-list that only contained a-z with string-lessp, the
sorted sub-list was not in the right alphabetical order i.e., instead of
"a b c d ..." it was "a c b d ..."

I hope the above makes the situation clear.





  reply	other threads:[~2022-07-02  8:40 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-30 12:13 bug#56323: 29.0.50; Add new customisable phonetic Tamil input method Visuwesh
2022-06-30 14:08 ` Visuwesh
2022-06-30 15:53 ` Visuwesh
2022-07-01 12:59 ` bug#56323: 29.0.50; [v2] " Visuwesh
2022-07-01 13:01   ` Visuwesh
2022-07-01 13:22   ` Eli Zaretskii
2022-07-01 13:47     ` Visuwesh
2022-07-01 14:06       ` Eli Zaretskii
2022-07-01 14:30         ` Visuwesh
2022-07-01 16:09           ` Eli Zaretskii
2022-07-01 16:37             ` Visuwesh
2022-07-01 18:16               ` Eli Zaretskii
2022-07-02  4:02                 ` Visuwesh
2022-07-02  6:35                   ` Eli Zaretskii
2022-07-02  6:54                     ` Visuwesh
2022-07-02  7:17                       ` Eli Zaretskii
2022-07-02  7:35                         ` Eli Zaretskii
2022-07-02  7:46                           ` Eli Zaretskii
2022-07-02  8:11                         ` Visuwesh
2022-07-02  8:29                           ` Eli Zaretskii
2022-07-02  8:40                             ` Visuwesh [this message]
2022-07-02  8:54                               ` Eli Zaretskii
2022-07-02  9:33                                 ` Visuwesh
2022-07-02  9:38                                   ` Eli Zaretskii
2022-07-02 10:31                                     ` Visuwesh
2022-07-02 10:46                                       ` Eli Zaretskii
2022-07-02 12:08                                         ` Visuwesh
2022-07-02 11:05                                       ` समीर सिंह Sameer Singh
2022-07-02 12:04                                         ` Visuwesh
2022-07-02 12:23                                         ` Eli Zaretskii
2022-07-02  6:58               ` Eli Zaretskii
2022-07-02  7:58                 ` Visuwesh
2022-07-02  8:39                   ` Eli Zaretskii
2022-07-02  9:28                     ` Visuwesh
2022-07-10  3:56                       ` Visuwesh
2022-07-10  5:34                         ` Eli Zaretskii
2022-07-10  6:42                           ` Visuwesh
2022-07-10  7:32                             ` Visuwesh
2022-07-14  6:34                               ` Eli Zaretskii
2022-07-14  7:11                                 ` Visuwesh
2022-07-02 12:15             ` Visuwesh
2022-07-03  3:57               ` Visuwesh

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