[XeTeX] Is it a bug on inter-char tokens?

Jonathan Kew jonathan_kew at sil.org
Thu Dec 13 02:16:34 CET 2007

On 2 Dec 2007, at 4:28 am, Yin Dian wrote:

> Hi all,
> It seems that \char cannot trigger the right inter-char token when the
> inter-char token between boundary and the specific class is not empty.
> The following code shows a minimal example.
> \XeTeXcharclass 65=22
> \XeTeXinterchartoks 22 0={\message{22-0}}
> \XeTeXinterchartoks 0 22={\message{0-22}}
> \XeTeXinterchartoks 22 255={\message{22-255}} % comment these two  
> lines
> \XeTeXinterchartoks 255 22={\message{255-22}} % to get the right  
> result
> \XeTeXinterchartokenstate=1
> \tracingall
> hello \char 65 world
> \bye
> It is expected to trigger the inter-char token between 22 and 0 after
> the \char command. However, the inter-char token between 255 and 22 is
> triggered, and the log file suggests the \char 65 is considered a
> blank space, and thus not displayed in the pdf file. Leaving the
> inter-char token between 255 and 22 empty could generate the right
> result.
> I'm using the latest xetex-dev in W32TeX. Can this "bug" be found on
> other platforms?

Yes, it is definitely a bug.

I have just made a correction to the source in the Subversion  
repository (rev. 538), and this example and similar tests now seem to  
run as expected.

I expect Akira will update the W32TeX xetex-dev package shortly;  
please let me know if you find further problems after that.


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