You can't use `\unskip' in vertical mode

名前: kk
日時: 2010-03-13 23:39:36
IPアドレス: 219.116.215.*

下記のマクロ関数をテストしているのですが，
jsbook利用時にエラー発生してしまいます．
どこを修正すべきでしょうか？

$ platex testmacro.tex
This is pTeX, Version 3.141592-p3.1.10 (utf8.euc) (Web2C 7.5.4)
(./testtest.tex
pLaTeX2e <2006/11/10>+0 (based on LaTeX2e <2003/12/01> patch level 0)
(/usr/local/teTeX/share/texmf/ptex/platex/jsclasses/jsbook.cls
Document Class: jsbook 2007/10/24 okumura
) (./testtest.aux)
! You can't use `\unskip' in vertical mode.
\@@test ...ph \def \@ii {\textbf {#2}}\fi \unskip 
                                                  \@ii \ifx \@i \empty \inde...
l.47 \test{あいうえお}{ABC}{}
                             
? 

%\documentclass{jarticle} % jarticleでエラー非発生
%\documentclass{jbook} % jbookでエラー非発生
%\documentclass{jsbook} % jsbookでエラー発生
\documentclass{jsarticle} % jsarticleでエラー発生
\makeatletter
\def\test{
\@ifstar%
{\@test}%
{\@test}%
}%
\def\@test{\@ifnextchar[{\@@test}{\@@test[]}}%
\def\@@test[#1]#2#3#4{%
\def\@ii{#2}%
\ifx\@ii\empty{#3} ({#1})%
\else%
\def\@i{#1}%
\ifx\@i\empty\def\@iii{#3}%
\else\def\@iii{{#3}, {#1}}\fi%
\def\@iv{#4}%
\ifx\@iv\empty\def\@description{\@iii}%
\else\def\@description{\@iii，#4}\fi%
\unskip\@ii%
\ifx\@i\empty\index{#2}%
\else\index{#2（#1）}\fi%
\unskip（\@description）%
\fi%
}%
\makeatother
%
\begin{document}
\section{セクション}
\test{あいうえお}{ABC}{}
\end{document}

この書き込みへの返事：