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\ProvidesPackage{stackengine}
[2013/06/12 v1.0
Stacking text and objects in convenient ways]
% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either version 1.3
% 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.
%
% This work has the LPPL maintenance status `maintained'.
%
% The Current Maintainer of this work is Steven B. Segletes.
%
% V1.0 Initial release.
\usepackage{calc}
\usepackage{readarray}
\newcounter{stackindex}
\newlength\Sstackgap
\newlength\Lstackgap
\newlength\boxshift
\newlength\stack@tmplength
\global\newlength\stackedboxwidth
\newsavebox\addedbox
\newsavebox\anchorbox
\newsavebox\stackedbox
\newcommand\stackgap{\if S\stacktype\the\Sstackgap\else\the\Lstackgap\fi}
\global\Sstackgap=3pt % SHORTSTACKING GAP BETWEEN ITEMS (SAME AS \shortstack)
\global\Lstackgap=\baselineskip % LONGSTACKING GAP BETWEEN ITEMS (def. \baselineskip)
\def\useanchorwidth{F}% T= FORCE BOX WIDTH TO ANCHOR-WIDTH
\def\quietstack{F}% T = SUPPRESS OUTPUT OF ALL COMMANDS
% (USE \usebox{\stackedbox} TO RETRIEVE)
\def\stackalignment{c}% l, c, or r for left, center or right alignment
\def\stacktype{S}% S for constant gap shortstack;
% L for constant baselineskip longstack
\def\usestackstrut{T}%
%\stackengine{\Sstackgap or \Lstackgap or \stackgap or stacklength}
% {anchor}
% {item}
% {O or U}
% {\stackalignment or l or c or r}
% {\quietstack or T or F}
% {\useanchorwidth or T or F}
% {\stacktype or S or L}
\newcommand*\stackengine[8]{%
\sbox{\stackedbox}{%
\sbox{\anchorbox}{#2}%
\sbox{\addedbox}{#3}%
\settowidth{\stackedboxwidth}{#2}%
\if F#7%
\ifdim\wd\addedbox>\stackedboxwidth%
\settowidth{\stackedboxwidth}{#3}%
\fi%
\fi%
\setlength{\boxshift}{#1}%
\if L#8%
\if U#4%
\setlength{\boxshift}{-\boxshift}%
\fi%
\else%
\if U#4%
\setlength{\boxshift}{-\dp\anchorbox -\ht\addedbox -\boxshift}%
\else%
\setlength{\boxshift}{\ht\anchorbox +\dp\addedbox +\boxshift}%
\fi%
\fi%
\if c#5%
\hspace{.5\stackedboxwidth}%
\hspace{-.5\wd\anchorbox}%
\usebox{\anchorbox}%
\hspace{-.5\wd\anchorbox}%
\hspace{-.5\wd\addedbox}%
\raisebox{\boxshift}{#3}%
\hspace{-.5\wd\addedbox}%
\hspace{.5\stackedboxwidth}%
\else%
\if l#5%
\usebox{\anchorbox}%
\hspace{-\wd\anchorbox}%
\raisebox{\boxshift}{#3}%
\hspace{-\wd\addedbox}%
\hspace{\stackedboxwidth}%
\else%
\if r#5%
\hspace{\stackedboxwidth}%
\hspace{-\wd\anchorbox}%
\usebox{\anchorbox}%
\hspace{-\wd\addedbox}%
\raisebox{\boxshift}{#3}%
\fi%
\fi%
\fi%
}%
\if F#6\usebox{\stackedbox}\fi%
}
\newcommand*\stackunder[3][\stackgap]{%
\stackengine{#1}{#2}{#3}{U}{\stackalignment}{\quietstack}{\useanchorwidth}%
{\stacktype}}
\newcommand*\stackon[3][\stackgap]{%
\stackengine{#1}{#2}{#3}{O}{\stackalignment}{\quietstack}{\useanchorwidth}%
{\stacktype}}
\newcommand*\Shortstack[2][\stackalignment]{%
\getargsC{#2}%
\setcounter{stackindex}{1}%
\sbox{\stackedbox}{\argi}%
\whiledo{\thestackindex < \narg}{%
\stepcounter{stackindex}%
\stackengine{\Sstackgap}{\csname arg\roman{stackindex}\endcsname}%
{\usebox{\stackedbox}}{O}{#1}{T}{\useanchorwidth}{S}%
}%
\if F\quietstack\usebox{\stackedbox}\fi%
}
\newcommand*\Shortunderstack[2][\stackalignment]{%
\getargsC{#2}%
\setcounter{stackindex}{\narg}%
\sbox{\stackedbox}{\csname arg\roman{stackindex}\endcsname}%
\whiledo{\thestackindex > 1}{%
\addtocounter{stackindex}{-1}%
\stackengine{\Sstackgap}{\csname arg\roman{stackindex}\endcsname}%
{\usebox{\stackedbox}}{U}{#1}{T}{\useanchorwidth}{S}%
}%
\if F\quietstack\usebox{\stackedbox}\fi%
}
\newcommand*\Longstack[2][\stackalignment]{%
\getargsC{#2}%
\setcounter{stackindex}{1}%
\sbox{\stackedbox}{\argi}%
\whiledo{\thestackindex < \narg}{%
\stepcounter{stackindex}%
\stackengine{\Lstackgap}{\csname arg\roman{stackindex}\endcsname}%
{\usebox{\stackedbox}}{O}{#1}{T}{\useanchorwidth}{L}%
}%
\if F\quietstack\usebox{\stackedbox}\fi%
}
\newcommand*\Longunderstack[2][\stackalignment]{%
\getargsC{#2}%
\setcounter{stackindex}{\narg}%
\sbox{\stackedbox}{\csname arg\roman{stackindex}\endcsname}%
\whiledo{\thestackindex > 1}{%
\addtocounter{stackindex}{-1}%
\stackengine{\Lstackgap}{\csname arg\roman{stackindex}\endcsname}%
{\usebox{\stackedbox}}{U}{#1}{T}{\useanchorwidth}{L}%
}%
\if F\quietstack\usebox{\stackedbox}\fi%
}
\newcommand*\tllap[2][\Lstackgap]{%
\stackengine{#1}{}{#2}{O}{r}{\quietstack}{T}{L}%
}
\newcommand*\tclap[2][\Lstackgap]{%
\stackengine{#1}{}{#2}{O}{c}{\quietstack}{T}{L}%
}
\newcommand*\trlap[2][\Lstackgap]{%
\stackengine{#1}{}{#2}{O}{l}{\quietstack}{T}{L}%
}
\newcommand*\bllap[2][\Lstackgap]{%
\stackengine{#1}{}{#2}{U}{r}{\quietstack}{T}{L}%
}
\newcommand*\bclap[2][\Lstackgap]{%
\stackengine{#1}{}{#2}{U}{c}{\quietstack}{T}{L}%
}
\newcommand*\brlap[2][\Lstackgap]{%
\stackengine{#1}{}{#2}{U}{l}{\quietstack}{T}{L}%
}
\newcommand*\stackanchor[3][\stackgap]{%
\setlength{\stack@tmplength}{#1}%
\setlength{\stack@tmplength}{.5\stack@tmplength}%
\if T\usestackstrut%
\if S\stacktype\addtolength{\stack@tmplength}%
{.5\ht\strutbox-.5\dp\strutbox}\fi%
\fi%
\stackengine{\stack@tmplength}{}{#2}{O}{\stackalignment}{T}{F}{\stacktype}%
\if T\usestackstrut%
\if S\stacktype\addtolength{\stack@tmplength}%
{-\ht\strutbox+\dp\strutbox}\fi%
\fi%
\stackengine{\stack@tmplength}{\usebox{\stackedbox}}{#3}{U}%
{\stackalignment}{\quietstack}{F}{\stacktype}%
}
\newcommand*\belowbaseline[2][\stackgap]{%
\stackengine{#1}{}{#2}{U}{\stackalignment}{\quietstack}{F}%
{\stacktype}}
\newcommand*\topinset[4]{\stack@inset{#1}{#2}{#3}{#4}{O}}
\newcommand*\bottominset[4]{\stack@inset{#1}{#2}{#3}{#4}{U}}
\newcommand*\stack@inset[5]{%
\ifthenelse{\equal{#3}{}}
{\setlength{\stack@tmplength}{0pt}}%
{\setlength{\stack@tmplength}{#3}}%
\ifthenelse{\equal{#4}{}}{\def\stack@tmp{0pt}}{\def\stack@tmp{#4}}%
\def\stack@lroffset{\rule{\stack@tmp}{0pt}}%
\addtolength{\stack@tmplength}{\heightof{#1}}%
\stackengine{-\stack@tmplength}{#2}{\stack@lroffset#1\stack@lroffset}%
{#5}{\stackalignment}{\quietstack}{\useanchorwidth}{S}%
}
\newcommand*\savestack[2]{%
\global\edef\sv@name{\stack@macro@name{#1}}%
\@ifundefined{\sv@name content}{%
\expandafter\newsavebox\expandafter{\csname\sv@name content\endcsname}%
}{}%
\expandafter\sbox\csname\sv@name content\endcsname{#2}%
\protected@edef#1{\usebox{\csname\sv@name content\endcsname}}%
}
% Following 3 lines thanks to Prof. Enrico Gregorio, from:
% http://tex.stackexchange.com/questions/42318/
% removing-a-backslash-from-a-character-sequence
\begingroup\lccode`\|=`\\
\lowercase{\endgroup\def\removebs#1{\if#1|\else#1\fi}}
\newcommand{\stack@macro@name}[1]{\expandafter\removebs\string#1}
%
\endinput
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