Chinese punctuation problem

Question

I am trying to move a Chinese punctuation mark to the head of a character. I am using the following macro, which works fine. But if I redefine the \CJKpunctsymbol, it will be a messy. Can any one help me on this?

works fine code - which directly apply to a punctuation:

\hskip -0.9em \vbox to 0.1em {\vskip -1em{\hbox to 0.9em {。}}}

Redefine \CJKpunctsymbol - the \hbox will be very long and can't resize.

\def\vCJKpunctsymbol#1{\hskip -0.9em \vbox to 0.1em {\vskip -1em {\hbox to 0.9em {\CJKsymbol{#1}}}}}
\let\CJKpunctsymbol\vCJKpunctsymbol

The following 2 pictures are examples. I use \fbox to make it clear.

Answer 1

For old-style punctuation (句读), I think it can be defined like this:

\catcode`。\active
\def。{\makebox[0pt][l]{\hskip-.25em\raisebox{1ex}{\string。}}}

No xeCJK punctuation features should be used, since the current version of xeCJK does not support vertical typesetting properly.

An example:

\documentclass{article}
\usepackage{xeCJK}

\setCJKmainfont[RawFeature={script=hani:language=CHN:vertical:+valt}]{SimSun}

\catcode`。\active
\def。{\makebox[0pt][l]{\hskip-.25em\raisebox{1ex}{\string。}}}
\catcode`、\active
\def、{\makebox[0pt][l]{\hskip-.25em\raisebox{1ex}{\string、}}}

\begin{document}

\rotatebox{-90}{%
子曰。学而时习之、不亦说乎。}

\end{document}