[XeTeX] XeTeXcharclass inserts spaces

[Jonathan Kew]

On 20 Oct 2008, at 5:10 PM, Ulrike Fischer wrote:

> Hello,
>
> In the following document I get spaces between the "a" and the "b",  
> but
> not between "d" and "b". Bug or feature?

Feature, not bug, I believe.

I think you're seeing the effects of the default classes and interchar  
toks assignments that are found at the end of unicode-letters.tex, to  
provide some basic functionality for CJK text (though of course  
packages like zhspacing do a far more thorough job). The unicode- 
letters file uses class 1 for ideographs, 2 for opening punctuation,  
and 3 for closing, and arranges to insert a little space before and  
after runs of CJK text, among other things. (See the source for the  
actual details.)

JK


>
>
> This is XeTeX, Version 3.1415926-2.2-0.999.6 (miktex):
>
> \documentclass{book}
> \XeTeXinterchartokenstate=1
>
> \begin{document}
> \XeTeXcharclass `\b 2
> \XeTeXcharclass `\d 3
>
> aba
>
> dbd
> \end{document}
>
>
> -- 
> Ulrike Fischer
>
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