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Filename : exaccent.sty
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% exaccent.sty: for extended accent.
% Copyright 2002 FUKUI Rei
%
% This program may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either version 1.2
% of this license or (at your option) any later version.
% The latest version of this license is in
%   http://www.latex-project.org/lppl.txt
% and version 1.2 or later is part of all distributions of LaTeX 
% version 1999/12/01 or later.
%
% This program consists of all files listed in Manifest.txt.
%
% Version 1.0 1996/06/10
%
% This file is based on `tsipa.sty' for TSIPA created by
%   KOBAYASHI Hajime, FUKUI Rei and SHIRAKAWA Shun.
%

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{exaccent}[1996/06/10 extended accent Version 1.0]

{\slshape\xdef\@slshapename{\f@shape}}
{\itshape\xdef\@itshapename{\f@shape}}

\newcommand\upperaccent{\@ifnextchar[{\upper@accent a\empty}%
  {\upper@accent a\empty[\z@]}}
\newcommand\Upperaccent{\@ifnextchar[{\upper@accent b\empty}%
  {\upper@accent b\empty[\z@]}}
\newcommand\loweraccent{\@ifnextchar[{\lower@accent a\empty}%
  {\lower@accent a\empty[\z@]}}
\newcommand\Loweraccent{\@ifnextchar[{\lower@accent b\empty}%
  {\lower@accent b\empty[\z@]}}

\def\upper@accent#1#2[#3]#4#5{{\leavevmode
  \setbox\z@\hbox{#5}\setbox\@ne\hbox{#2%
    \if a#1\char#4\else#4\fi}%
  \ifx\empty#5\empty\box\@ne\else
  \@getaccshift \let\c@lcshift\@pshift
  \dimen\z@\ht\@ne
  \ifdim\ht\@ne>1ex \advance\dimen\z@ -1ex \else
  \ifdim\ht\@ne=\z@ \dimen\z@\dp\@ne \fi\fi
  \vbox{\hsize\wd\z@\offinterlineskip
    \hb@xt@\z@{\@accshift{#3}\hb@xt@\wd\z@{%
     \hss\vbox to \dimen\z@{\hbox{\box\@ne}\vss}\hss}\hss}
    \kern#3
    \hbox{#5}}\fi}}

\def\lower@accent#1#2[#3]#4#5{{\leavevmode
  \setbox\z@\hbox{#5}\setbox\@ne\hbox{#2%
    \if a#1\char#4\else#4\fi}%
  \ifx\empty#5\empty\box\@ne\else
  \@getaccshift \let\c@lcshift\s@bshift
  \dimen\z@\ht\@ne
  \ifdim\ht\@ne>1ex \advance\dimen\z@ -1.1ex \else
  \ifdim\ht\@ne=\z@ \dimen\z@\dp\@ne \fi\fi
  \vtop{\hsize\wd\z@\offinterlineskip
    \hbox{#5}
    \kern#3
    \hbox{\@accshift{#3}\hb@xt@\wd\z@{%
      \hss\vbox to \dimen\z@{\hbox{\box\@ne}\vss}\hss}}}\fi}}

\newcommand\@getaccshift{\def\@accshift##1{}%
  \ifx\f@shape\@slshapename\let\@accshift\@accshiftsl\fi
  \ifx\f@shape\@itshapename\let\@accshift\@accshiftsl\fi}

\newcommand\@accshiftsl[1]{\c@lcshift{#1}\kern-.16667\dimen\@ne}

\newcommand\@pshift[1]{%
  \dimen\@ne-\ht\z@          % get height of the box to be accented
  \advance\dimen\@ne -#1%    % add margin between the letter and accent
  \ifdim\ht\@ne>1ex
    \advance\dimen\@ne 1ex\else
  \ifdim\ht\@ne=\z@
    \advance\dimen\@ne -\dp\@ne\fi\fi}
    
\newcommand\s@bshift[1]{%
  \dimen\@ne\dp\z@                % get depth of the box to be accented
  \ifdim\ht\@ne>\z@
    \advance\dimen\@ne \ht\@ne\fi % add ht of the accent
  \ifdim\ht\@ne>1ex
    \advance\dimen\@ne #1\fi}     % add margin between the letter and accent

\endinput