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% This is the file ruby.sty of the CJK package
% for displaying ruby (i.e. furigana).
%
% created by Werner Lemberg <wl@gnu.org>
%
% Version 4.6.0 (11-Aug-2005)
\NeedsTeXFormat{LaTeX2e}[1995/06/01]
\def\fileversion{4.6.0}
\def\filedate{2005/08/11}
\ProvidesPackage{ruby}[\filedate\space\fileversion]
\RequirePackage{CJK}[1996/11/20]
\newif\ifruby@overlap@
\newif\ifruby@CJK@
\DeclareOption{overlap}{\ruby@overlap@true}
\DeclareOption{nooverlap}{\ruby@overlap@false}
\DeclareOption{CJK}{\ruby@CJK@true}
\DeclareOption{latin}{\ruby@CJK@false}
\ExecuteOptions{overlap, CJK}
\ProcessOptions
% we suppress any unwanted spaces produced by linefeeds.
\endlinechar \m@ne
% to get a small separation between adjacent lines.
\lineskiplimit 1pt
\newdimen\ruby@width
\edef\ruby@kern{\kern -5sp\kern 5sp}
\newcommand{\rubysize}{0.4}
\newcommand{\rubysep}{-0.5ex}
\newcommand{\rubyoverlap}{\ruby@overlap@true}
\newcommand{\rubynooverlap}{\ruby@overlap@false}
\newcommand{\rubyCJK}{\ruby@CJK@true}
\newcommand{\rubylatin}{\ruby@CJK@false}
% #1 is the base character; #2 is the ruby.
\DeclareRobustCommand{\ruby}[2]{
{\@tempdimc \f@size\p@
\@tempdimc \rubysize\@tempdimc
\sbox\z@{\vrule\@height.7\baselineskip\@depth\z@\@width\z@ #1}
\sbox\@tempboxa{\fontsize{\@tempdimc}{1.2\@tempdimc}\selectfont
\vrule\@height\z@\@depth.3\baselineskip\@width\z@ #2}
\@tempdimb\ruby@width
\global\ruby@width \wd\@tempboxa
\global\advance\ruby@width -\wd\z@
\global\divide\ruby@width \tw@
\ifdim\ruby@width > \z@
\else
\global\ruby@width \z@
\fi
% we first compute the box of the ruby with its base character(s).
\ifruby@overlap@
\setbox\@tempboxa \vbox{
\hbox to \wd0{\hss \box\@tempboxa \hss}
\nointerlineskip
\kern\rubysep
\box\z@}
\else
\ifdim\ruby@width > \z@
\@tempdima \wd\@tempboxa
\else
\@tempdima \wd\z@
\fi
\setbox\@tempboxa \vbox{
\hbox to \@tempdima{\hss \box\@tempboxa \hss}
\nointerlineskip
\kern\rubysep
\hbox to \@tempdima{\hss \box\z@ \hss}}
\fi
% are we at the beginning of a paragraph?
\ifvmode
\leavevmode
\ifruby@overlap@
\kern\ruby@width
\fi
\else
% has previous character a ruby?
\ifnum\lastkern = 5% \ruby@kern
\kern\@tempdimb
\ifruby@CJK@
\nobreak
\CJKglue
\nobreak
\fi
\ifruby@overlap@
\kern\ruby@width
\fi
\else
\ifruby@CJK@
% is previous character an ordinary CJK character?
\ifnum\lastkern = \@ne% \CJK@CJK
\ifdim\ruby@width > \z@
\nobreak
\CJKglue
\nobreak
\else
\CJKglue
\fi
\else
% is previous character a punctuation character?
\ifnum\lastkern = \tw@% \CJK@kern
\nobreak
\CJKglue
\nobreak
\fi
\fi
\fi
\fi
\fi
\box\@tempboxa
\ruby@kern
\ifdim\ruby@width > \z@
\ifruby@overlap@
\else
\global\ruby@width\z@
\fi
\else
\global\ruby@width\z@
\fi}
\ifruby@CJK@
\ignorespaces
\fi}
% reset endline character.
\endlinechar `\^^M
\endinput
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