[XeTeX] problem with discretionary

Zdenek Wagner zdenek.wagner at gmail.com
Sun Dec 3 11:01:35 CET 2017


please, notice that the number of character classes was increased from 256
to 4096, so 255 no longer works as a boundary but 4095 must be used. I use
the following code that I took from some other package:

\edef\CSat{\the\catcode`\@} % in order to work in plain XeTeX
\ifdefined\e at alloc@intercharclass at top
  \chardef\CSboundary=\e at alloc@intercharclass at top
    \chardef\CSboundary=4095 %
      \e at alloc\XeTeXcharclass\chardef
              \xe at alloc@intercharclass\m at ne\@ucharclass at boundary}

Afterwards I use \CSboundary instead of a fixed number. It thus works both
with the old and new XeTeX.

Zdeněk Wagner

2017-12-03 10:19 GMT+01:00 jfbu <jfbu at free.fr>:

> Hi,
> I need some help to identify which XeTeX release fixed
> that problem, the mwe is
> \catcode`@ 11
> \XeTeXinterchartokenstate=1
> \newXeTeXintercharclass\french at punctthin
> \XeTeXcharclass `\; \french at punctthin
>      \XeTeXinterchartoks 255 \french at punctthin = {\nobreak\thinspace}%
> \catcode`;\active
> \def;{\discretionary{\char`\;}{}{\char`\;}}
> a;b
> \bye
> In  real life it appeared in a Polyglossia+French context
> with the semi-colon make active to insert a \discretionary
> similar to the above. There is no issue in lualatex.
> It is currently seen at Python upstream (CPython) when
> they try to build French docs (via Sphinx)
> https://bugs.python.org/issue31589
> and it would be nice to pinpoint which XeTeX release
> precisely is ok. I know 0.99992 is bad and 0.99996 is good,
> but can't easily bisect.
> Best,
> Jean-François
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