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%% This is file `fbox.sty',
%%
%% Copyright (C) 2019
%% Herbert Voss <hvoss@tug.org>
%%
%% It may be distributed and/or modified under the
%% conditions of the LaTeX Project Public License, either version 1.3c
%% 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 1.3c or later is part of all distributions of LaTeX
%% version 2005/12/01 or later.
%
% $Id: fbox.sty 946 2019-03-08 12:08:22Z herbert $
%
% -------------------------------------
\ProvidesPackage{fbox}[2019/03/00 v. 0.01 allow parts of the frame (hv)]
%
\let\orig@fbox\fbox
\def\fb@lowerc@se#1{\lowercase{\edef\@tempa{#1}}}
%
\long\def\fbox{\@ifnextchar[\FBox@i\orig@fbox}
%
\def\FBox@i[#1]{%
\ifx\relax#1\relax
\@tempcntb=15
\else
\@tempcntb=\z@
\fb@lowerc@se{#1}%
\expandafter\FBox@ii\@tempa\@nil\relax
\fi
\FBox@iii
}
\def\FBox@ii#1#2\@nil{%
\ifx#1t\advance\@tempcntb by 8% top
\else
\ifx#1l\advance\@tempcntb by 4% left
\else
\ifx#1r\advance\@tempcntb by 2% right
\else
\ifx#1b\advance\@tempcntb by 1% bottom
\fi\fi\fi\fi
\if\relax#2\relax\def\next{}\else\def\next{\FBox@ii#2\@nil}\fi
\next
}
\def\FBox@iii#1{%
\leavevmode
\setbox\@tempboxa\hbox{%
\color@begingroup
\kern\fboxsep{#1}\kern\fboxsep
\color@endgroup}%
\@FrameB@x\relax}
%
\def\@FrameB@x#1{%
\@tempdima\fboxrule
\advance\@tempdima\fboxsep
\advance\@tempdima\dp\@tempboxa
\hbox{%
\lower\@tempdima\hbox{%
\vbox{%
\ifnum\the\@tempcntb>8\relax
\advance\@tempcntb by -8
\hrule\@height\fboxrule % top
\fi
\hbox{%
\ifnum\@tempcntb>3
\advance\@tempcntb by -4
\vrule\@width\fboxrule
\fi % left
#1%
\vbox{%
\vskip\fboxsep
\box\@tempboxa
\vskip\fboxsep}%
#1%
\ifnum\@tempcntb>1\vrule\@width\fboxrule\fi}% right
\ifodd\@tempcntb\hrule\@height\fboxrule\fi}% bottom
}%
}%
}
\endinput
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