Re: Proposal: add simpler case closure

OK, we can stick with the original proposal.

Deborah

On Oct 4, 2004, at 4:00 PM, Mark Davis wrote:

> I don't think it's worth separating out these three cases -- and any 
> extra
> work done in special cases where we know the source is 'limited' in 
> some way
> or another is insignificant.
>
> Mark
>
> ----- Original Message -----
> From: "Markus Scherer" <[email protected]>
> To: "icu list" <[email protected]>
> Sent: Monday, October 04, 2004 15:29
> Subject: Re: Proposal: add simpler case closure
>
>
>> Deborah Goldsmith wrote:
>>> The simple case closure will take the existing items in the set, and
>>> perform uppercase, lowercase, and titlecase (only relevant for 
>>> strings)
>>> operations on them, then add them back in. Therefore [a S DZ] would
>>> become [a A s S DZ Dz dz].
>>
>> Possible alternative:
>>
>> You could add three options - one to add the simple-lowercase forms 
>> of the
> existing characters, one
>> for upper, one for title. Then you would use only the upper+title for
> exemplar characters because we
>> store them in lowercase.
>>
>> This would get proper behavior, add some useful functionality, and 
>> would
> also help with performance
>> because it would not have to look up the lowercase form of
> already-lowercase characters.
>>
>> You could implement these three with one single loop.
>>
>> Note: I recently munged the ICU4C case mapping code a lot, and 
>> modified
> UnicodeSet some, too. You
>> will want to take a look at the new, internal ucase.h and use its
> functions, starting from
>> ucase_getSingleton(). Makes it faster and more modular. Please keep 
>> such
> code in uniset_props.cpp,
>> for modularization (uniset.cpp itself is now properties-free).
>>
>> markus
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>
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