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Re: Case mapping of sharp s
From: |
Eli Zaretskii |
Subject: |
Re: Case mapping of sharp s |
Date: |
Mon, 16 Nov 2009 21:12:59 +0200 |
> From: Kenichi Handa <address@hidden>
> Date: Mon, 16 Nov 2009 21:06:38 +0900
> Cc: address@hidden
>
> In article <address@hidden>, Ulrich Mueller <address@hidden> writes:
>
> > In Unicode since version 5.1.0 the U+1E9E code point is assigned to
> > "LATIN CAPITAL LETTER SHARP S". Would it be possible to add a mapping
> > from this to the lower case ß, as in the patch below?
>
> > However, I've noticed that similar mappings for Turkish ı (dotless i)
> > and İ (I with dot) were commented out [1]. Is it still so that such a
> > change would "make searches slow", as stated in the comment?
>
> That kind of setting surely makes the searching of ß and ẞ
> slow because we can't use BM search when case-fold-search is
> non-nil. BM search is possible only when all
> case-equivalent characters are represented by the same byte
> length, and differ only in the last byte.
I think we need to solve this limitation anyway, if we want a decent
support for Unicode. There are many more pairs of characters that
should normally be considered equal in search.
Wouldn't the technique described in UTS 18
(http://www.unicode.org/reports/tr18/) help here?
- Case mapping of sharp s, Ulrich Mueller, 2009/11/15
- Re: Case mapping of sharp s, Kenichi Handa, 2009/11/16
- Re: Case mapping of sharp s,
Eli Zaretskii <=
- Re: Case mapping of sharp s, Kenichi Handa, 2009/11/17
- Re: Case mapping of sharp s, Eli Zaretskii, 2009/11/17
- Re: Case mapping of sharp s, Kenichi Handa, 2009/11/17
- Re: Case mapping of sharp s, Eli Zaretskii, 2009/11/17
- Re: Case mapping of sharp s, Stephen J. Turnbull, 2009/11/18
- Re: Case mapping of sharp s, Kenichi Handa, 2009/11/18
- Re: Case mapping of sharp s, Stefan Monnier, 2009/11/18
- Re: Case mapping of sharp s, Ulrich Mueller, 2009/11/18
- Re: Case mapping of sharp s, Stefan Monnier, 2009/11/18
- Re: Case mapping of sharp s, Eli Zaretskii, 2009/11/18