[XeTeX] \XeTeXinterchartoks and \hbox

[Vafa Khalighi]

What is the problem with the following minimal example:

 \documentclass{article}

\usepackage{color}

\makeatletter

\newcount\n

\n=`\a \loop \XeTeXcharclass \n=4 \ifnum\n<`\z \advance\n by 1 \repeat

\XeTeXinterchartoks 0 4 {\startcolor}

\XeTeXinterchartoks 255 4 {\startcolor}

\XeTeXinterchartoks 255 0 {\finishcolor}

\XeTeXinterchartoks 4 0 {\finishcolor}

\newif\ifcolor

\newcommand{\startcolor}{\ifcolor\else\bgroup\color{red}\colortrue\fi}

\newcommand{\finishcolor}{\ifcolor\egroup\fi}

\makeatother

\XeTeXinterchartokenstate=1

\begin{document}

this is a test

\end{document}


It produces the following error:


! Missing } inserted.

<inserted text>

}

l.19 \end{document}

 ?


However if "this is a test" is replaced with "this is a test.", then I get
no error. How should I fix this?
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