\keywords{\TeX, p\TeX, \LuaTeX, \LuaTeX-ja, Japanese}
\abstract{%
\LuaTeX-ja package is a macro package for typesetting Japanese
-documents under \LuaTeX. The package has more flexibility of
+documents under \LuaTeX\@. The package has more flexibility of
typesetting than \pTeX, which is widely used Japanese extension of \TeX,
-and has corrected some unwanted features of \pTeX.
+and has corrected some unwanted features of \pTeX\@.
In this paper, we describe specifications, the current status and some
internal processing methods of \LuaTeX-ja.
}
Lua callbacks.
Before our \LuaTeX-ja project, there were several experimental attempts to typeset
-Japanese documents with \LuaTeX. Here we cite three examples:
+Japanese documents with \LuaTeX\@. Here we cite three examples:
\begin{itemize}
\item |luaums.sty|~\cite{luaums} developed by the author. This
experimental package is for creating a certain Japanese-based presentation
- with \LuaTeX.
+ with \LuaTeX\@.
\item the \emph{luajalayout} package~\cite{luajalayout}, formerly known as the
\emph{jafontspec} package, by Kazuki Maeda (前田一貴). This package is based on
\LaTeXe\ and \emph{fontspec} package.
\label{ssec-pol}
The first aim of \LuaTeX-ja project was to implement features (from the
`primitive' level) of \pTeX\ as macros under \LuaTeX, therefore \LuaTeX-ja is
-much affected by \pTeX. However, as development proceeded, some
+much affected by \pTeX\@. However, as development proceeded, some
technical/conceptual difficulties arose. Hence we changed the aim
of the project as follows:
\begin{itemize}
that the treatment of a line-break by \pTeX\ and that of \LuaTeX-ja are
totally same, however they are different in the respect that \LuaTeX-ja's
judgment whether a comment letter will be appended the line is done
-\emph{before} the line is actually processed by \LuaTeX.
+\emph{before} the line is actually processed by \LuaTeX\@.
Figure~\ref{fig-linebreak} shows an example of this situation; the
command at the second line marks most of Japanese characters as
list. Thus we can interrupt this process by writing as
|f{}irm|. However, \LuaTeX's process is \emph{node-based}, that is, the
process will be done when a horizontal box or a paragraph is ended, so
-|f{}irm| and |firm| yield same outputs under \LuaTeX.
+|f{}irm| and |firm| yield same outputs under \LuaTeX\@.
The situation for Japanese characters is more complicated.
Glues (and kerns) which are needed for Japanese
correction\footnote{\TeX82 (and \LuaTeX) does not distinguish
between explicit kern and a kern for italic correction. To
distinguish them, an additional subtype for a kern is introduced
- in \pTeX. On the other hand, \LuaTeX-ja uses an additional attribute and
+ in \pTeX\@. On the other hand, \LuaTeX-ja uses an additional attribute and
redefines \texttt{\char`\\/} to set this attribute.} for $p$. It is natural that
these attachments should be ignored inside the process. Hence
\LuaTeX-ja takes this approach, as the latest version of
\subsection{Character ranges}
Before we describe the approach taken in \LuaTeX-ja, we review the
-approach taken by u\pTeX. u\pTeX\ extends the |\kcatcode| primitive in
+approach taken by u\pTeX\@. u\pTeX\ extends the |\kcatcode| primitive in
\pTeX, to use this primitive for setting how a character is treated
among alphabetic characters~(15), \emph{kanji}~(16), \emph{kana}~(17),
\emph{Hangul}~(17), or~\emph{other CJK characters}~(18).
The assignment to |\kcatcode| can be done by a Unicode
block.\footnote{There are some exceptions. For example, U+FF00--FFEF
(Halfwidth and Fullwidth Forms) are divided into three blocks in recent
-u\pTeX.}
+u\pTeX\@.}
\LuaTeX-ja adopted a different approach. There are many Unicode blocks
in Basic Multilingual Plane which are not included in
|\font| for alphabetic fonts, |\jfont| for Japanese fonts (in horizontal
direction) and |\tfont| for Japanese fonts (in vertical direction). With
these slots, we can manage the current font for alphabetic characters
-and that for Japanese characters separately in \pTeX. However, \LuaTeX\
+and that for Japanese characters separately in \pTeX\@. However, \LuaTeX\
has only one slot for maintaining the current font, as \TeX82. This
situation leads a problem: how can we maintain the `current Japanese
font'?
Subsection~\ref{ssec-pol}.
As in Figure~\ref{fig-jfdef}, \LuaTeX-ja uses |\jfont| for defining
-Japanese fonts, as \pTeX. However, because the information of the current
+Japanese fonts, as \pTeX\@. However, because the information of the current
Japanese font is stored into an attribute, control sequences defined by
|\jfont| (e.g.,~|\foo| and |\bar| in Figure~\ref{fig-jfdef}) is
not representing a font by the means of \TeX82. In other words, each of
As we noted in Subsection~\ref{ssec-csname}, parameters that the values
at the end of a horizontal box or that of a paragraph are valid in
whole box or paragraph, such as \emph{kanjiskip}, cannot be implemented
-by internal integers or registers of other types in \TeX. We explain it
+by internal integers or registers of other types in \TeX\@. We explain it
in this subsection.
\begin{figure}
subtype(cur_box) = HLIST_SUBTYPE_HBOX;
} else {
\end{lstlisting}
-\caption{An extract of a CWEB-source \texttt{tex/packaging.w} of \LuaTeX.}
+\caption{An extract of a CWEB-source \texttt{tex/packaging.w} of \LuaTeX\@.}
\label{fig-ltsrc}
\end{figure}
\section{Conclusion}
We have discussed about our \LuaTeX-ja package, which is much affected
-by \pTeX. For now, it can be used for experimental use, however there
+by \pTeX\@. For now, it can be used for experimental use, however there
are much refinements which are needed for regular use. The author hopes
that this paper and \LuaTeX-ja project contribute the typesetting Japanese,
-and possibly other Asian languages, under \LuaTeX.
+and possibly other Asian languages, under \LuaTeX\@.
\section*{Acknowledgements}
The author would like to thank Ken Nakano and Hideaki Togashi for their
-development and management of ASCII \pTeX. The author is very grateful to Haruhiko
+development and management of ASCII \pTeX\@. The author is very grateful to Haruhiko
Okumura for his leadership in the Japanese \TeX\ community. The author
is also very grateful to members of \LuaTeX-ja project team for their
valuable cooperation in development.
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