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From Robert Hu <roberthu...@gmail.com>
Subject Re: [classlib][luni]difference between RI and ICU
Date Tue, 12 Sep 2006 06:44:11 GMT
Tony Wu 写道:
> I encounter a problem when implement isWhiteSpace(int) in j.l.Character.
> There is a difference between RI and ICU.
>
> RI spec says,
>
>
>> It is a Unicode szpace character (SPACE_SEPARATOR, LINE_SEPARATOR, or
>> PARAGRAPH_SEPARATOR) but is not also a non-breaking space ('\u00A0',
>> '\u2007', '\u202F').
Anyway, spec is our first rule to follow.
> but ICU spec says,
>
>> It is a Unicode space separator (category "Zs"), but is not a no-break
>> space (\u00A0 or \u202F or \uFEFF).
>
> RI excludes U+2007 however ICU excludes U+FEFF
>
> And I looked up the definition of these 4 related characters on 
> unicode.org:
>
>> 00A0;NO-BREAK SPACE;Zs;0;CS;<noBreak> 0020;;;;N;NON-BREAKING SPACE;;;;
>> 2007;FIGURE SPACE;Zs;0;WS;<noBreak> 0020;;;;N;;;;;
>> 202F;NARROW NO-BREAK SPACE;Zs;0;CS;<noBreak> 0020;;;;N;;;;;
>> FEFF;ZERO WIDTH NO-BREAK SPACE;Cf;0;BN;;;;;N;BYTE ORDER MARK;;;;
So cool... :-)
>
> I consider it is a bug of ICU because the U+FEFF is not in category 
> *Zs* as
> ICU spec described. And I purposed to report that to ICU team.
> Should I handle the U+2007 by ourselves to follow RI or just document 
> this
> problem in testcase?
>
IMO, it's natural to follow RI, and the challenge is to fix it 
gracefully with ICU implementation.

-- 
Robert Hu
China Software Development Lab, IBM



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