On 04/01/09 04:07, pansz wrote:
> Tony Mechelynck 写道:
>> For the meaning of its settings, ":help 'iskeyword'" resends to ":help
>> 'isfname'" where it is said:
>>
>>> Multi-byte characters 256 and above are always included, only the
>>> characters up to 255 are specified with this option.
>>> For UTF-8 the characters 0xa0 to 0xff are included as well.
>> IOW it is not possible to treat some hanzi as 'iskeyword' characters and
>> others not. I think the above means that even the "ideographic
>> full-width space" U+3000 is treated as a keyword character, OTOH I
>> wouldn't affirm this without an experiment (maybe Vim with +multi_byte
>> knows about the main divisions of the Unicode codepoint range).
>
> This seems to hint vim is not using the standard iswalpha(), iswpunct()
> series widechar-type-check functions in<wctypes.h>.
>
> As far as I know the iswalpha() returns true only on true hanzi
> characters and will not return true on characters such as "ideographic
> full-width space".
>
> I guess this is a choice for efficiency if vim uses utf-8 internally,
> since utf-8 must be converted to ucs in order to use wctypes.
>
> If that is the case, making iskeyword supports multibyte character isn't
> hard (I had done similar things for Lua script language), but will
> sacrifice performance.
If you want to be sure, try some Chinese text with both hanzi and
wide-punctuation and see where the yiw (yank inner word) or viw (visual
inner word) stops. Here's a sample for you: 道可道、非常道。名可名、非常
名。 ;-)
In my Huge gvim 7.2.077 with +multi_byte, viw includes neither
ideographic comma nor ideographic full stop; but AFAIK there's no way to
tell vim that 不 "not", 故 "thus", 之 "'s" etc. are non-keyword
characters, since for multibyte characters this kind of status is hardcoded.
Best regards,
Tony.
--
TV is chewing gum for the eyes.
-- Frank Lloyd Wright
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