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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 4.8.5 (16-Oct-2021)
+
+% Copyright (C) 1994-2021 Werner Lemberg <wl@gnu.org>
+%
+% This program is free software; you can redistribute it and/or modify
+% it under the terms of the GNU General Public License as published by
+% the Free Software Foundation; either version 2 of the License, or
+% (at your option) any later version.
+%
+% This program is distributed in the hope that it will be useful,
+% but WITHOUT ANY WARRANTY; without even the implied warranty of
+% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+% GNU General Public License for more details.
+%
+% You should have received a copy of the GNU General Public License
+% along with this program in doc/COPYING; if not, write to the Free
+% Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+% MA 02110-1301 USA
+
+\NeedsTeXFormat{LaTeX2e}[1995/06/01]
+\def\fileversion{4.8.5}
+\def\filedate{2021/10/16}
+\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}
+
+ % save width value of previous ruby (if applicable)
+ \@tempdimb\ruby@width
+
+ \global\ruby@width \wd\@tempboxa
+ \global\advance\ruby@width -\wd\z@
+ \ifdim\ruby@width > \z@
+ \global\divide\ruby@width \tw@
+ \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 with \ruby@width > 0?
+ \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
+
+ \ifdim\ruby@width > \z@
+ \ruby@kern
+ \ifruby@overlap@
+ \else
+ \global\ruby@width\z@
+ \fi
+ \else
+ \kern -1sp
+ \kern 1sp
+ \global\ruby@width\z@
+ \fi}
+
+ \ifruby@CJK@
+ \ignorespaces
+ \fi}
+
+
+% reset endline character.
+
+\endlinechar `\^^M
+
+\endinput