ltboxes.dtx
% \iffalse meta-comment
%
% Copyright (C) 1993-2020
% The LaTeX3 Project and any individual authors listed elsewhere
% in this file.
%
% This file is part of the LaTeX base system.
% -------------------------------------------
%
% 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
% https://www.latex-project.org/lppl.txt
% and version 1.3c or later is part of all distributions of LaTeX
% version 2008 or later.
%
% This file has the LPPL maintenance status "maintained".
%
% The list of all files belonging to the LaTeX base distribution is
% given in the file `manifest.txt'. See also `legal.txt' for additional
% information.
%
% The list of derived (unpacked) files belonging to the distribution
% and covered by LPPL is defined by the unpacking scripts (with
% extension .ins) which are part of the distribution.
%
% \fi
%
% \iffalse
%%% From File: ltboxes.dtx
%
%<*driver>
% \fi
\ProvidesFile{ltboxes.dtx}
[2019/08/27 v1.3b LaTeX Kernel (Box Commands)]
% \iffalse
\documentclass{ltxdoc}
\GetFileInfo{ltboxes.dtx}
\title{\filename}
\date{\filedate}
\author{David Carlisle\and
Leslie Lamport\and
Frank Mittelbach\and
Chris Rowley}
\begin{document}
\MaintainedByLaTeXTeam{latex}
\maketitle
\DocInput{\filename}
\end{document}
%</driver>
% \fi
%
%
% \changes{v1.1e}{1998/08/17}{(RmS) Minor Documentation fixes.}
% \changes{v1.3b}{2019/08/27}{Various commands made robust}
%
%
%
% \section{\LaTeX\ Box commands}
%
%
% \DescribeMacro\makebox
% |\makebox[|\meta{wid}|][|\meta{pos}|]{|\meta{obj}|}|\\
% Puts \meta{obj} in an |\hbox| of width \meta{wid}, positioned by
% \meta{pos}.
%
% The possible \meta{pos} are:\\
% \begin{tabular}{ll}
% |s| stretched,\\
% |l| flushleft,\\
% |r| flushright,\\
% |c| (default) centred.
% \end{tabular}
%
% If \meta{wid} is missing, then \meta{pos} is also missing and
% \meta{obj} is put in an |\hbox| of its natural width.
%
% |\makebox(|\meta{x}|,|\meta{y}|)[|\meta{pos}|]{|\meta{obj}|}|\\
% Puts \meta{obj} in an |\hbox| of width $x * |\unitlength|$
% and height $y * |\unitlength|$.
% \meta{pos} arguments are
% |s|, |l|, |r| or |c| (default) for stretched, flushleft, flushright
% or centred, and |t| or |b|
% for top, bottom -- or combinations like |tr| or |rb|.
% Default for horizontal and vertical are centered.
% Note that in this picture mode version of |\makebox| a [b] aligns on
% the \emph{bottom} of the text as documented. If you want to align on
% the \emph{baseline} use
% |\makebox( , )[b]{\raisebox{0pt}[\height][0pt]{xyz}}}|
% or |\makebox( , )[b]{\smash{xyz}}|
%
% \DescribeMacro\mbox
% |\mbox{|\meta{obj}|}| The same as |\makebox{|\meta{obj}|}|, but is
% more efficient as no checking for optional arguments is done.
%
% \DescribeMacro\newsavebox
% |\newsavebox{\cmd}| : If |\cmd| is undefined, then defines it
% to be a \TeX\ box register.
%
% \DescribeMacro\savebox
% |\savebox{\cmd}| ... : |\cmd| is defined to be a \TeX\ box register,
% and the '...' are any |\makebox| arguments. It is
% like |\makebox|, except it doesn't produce text but
% saves the value in |\box| |\cmd|.
%
% \DescribeMacro\sbox
% |\sbox{|\meta{cmd}|}{|\meta{obj}|}| is an efficient abbreviation for\\
% |\savebox{|\meta{cmd}|}{|\meta{obj}|}|.
%
% \DescribeEnv{lrbox}
% |\begin{lrbox}{|\meta{cmd}|}|\meta{text}|\end{lrbox}| is equivalent
% to\\
% |\sbox{|\meta{cmd}|}{|\meta{text}|}|\\
% except that any white space at the beginning and end of \meta{text}
% is ignored.
%
% \DescribeMacro\framebox
% |\framebox| ... : like |\makebox|, except it puts a `frame' around
% the box. The frame is made of lines of thickness
% |\fboxrule|, separated by space |\fboxsep| from the
% text -- except for |\framebox(X,Y)| ... , where the
% thickness of the lines is as for the picture environment,
% and there is no separation added.
%
% \DescribeMacro\fbox
% |\fbox{|\meta{obj}|}| is an abbreviation for
% |\framebox{|\meta{obj}|}|.
%
% \DescribeMacro\parbox
% |\parbox[|\meta{pos}|][|\meta{height}|][|\meta{inner-pos}|]{|^^A
% \meta{width}|}{|\meta{text}|}| :
% Makes a box with |\hsize| \meta{width}, positioned by \meta{pos} as
% follows:
% c : |\vcenter| (placed in |$...$| if not in math mode)
% b : |\vbox|
% t : |\vtop|
% default value is c.
% Sets |\hsize| := \meta{width} and calls |\@parboxrestore|, which
% does the following:
% Restores the original definitions of:
%
% \begin{tabular}{l}
% |\par|\\
% |\\|\\
% |\-|\\
% |\'|\\
% | \`|\\
% |\=|
% \end{tabular}
%
% Resets the following parameters:
%
% \begin{tabular}{l@{\quad=\quad}ll}
% |\parindent| & 0pt \\
% |\parskip| & 0pt & added 20 Jan 87\\
% |\linewidth| & |\hsize|\\
% |\@totalleftmargin| & 0pt\\
% |\leftskip| & 0pt\\
% |\rightskip| & 0pt\\
% |\@rightskip| & 0pt\\
% |\parfillskip| & 0pt plus 1fil\\
% |\lineskip| & |\normallineskip|\\
% |\baselineskip| & |\normalbaselineskip|
% \end{tabular}
%
% Calls |\sloppy|
%
% Note: |\@arrayparboxrestore| same as |\@parboxrestore|
% but it doesn't restore |\\|.
%
% \DescribeEnv{minipage}
% |minipage| : Similar to |\parbox|, except it also
% makes this look like a page by setting
%
% |\textwidth| == |\columnwidth| == box width
%
% changes footnotes by redefining:\\%
% |\@mpfn| == mpfootnote \\
% |\thempfn| == |\thempfootnote|\\
% |\@footnotetext| == |\@mpfootnotetext|
%
% resets the following list environment parameters:\\
% |\@listdepth| == |\@mplistdepth|\\
% where |\@mplistdepth| is initialized to zero,
%
% and executes |\@minipagerestore| to allow the document
% style to reset any other parameters it desires.
% It sets |@minipage| true, and resets |\everypar| to set
% it false. This switch keeps |\addvspace| from putting space
% at the top of a minipage.
%
% Change added 24 May 89: |\minipage| sets |@minipage| globally;
% |\endminipage| resets it false.
%
%
% \DescribeMacro\rule
% |\rule[|\meta{raised}|]{|\meta{width}|}{|\meta{height}|}| :
% Makes a $\meta{width}*\meta{height}$ rule, raised \meta{raised}.
%
% \DescribeMacro\underline
% |\underline{|\meta{text}|}| : Makes an underlined hbox with
% \meta{text} in it.
%
% \DescribeMacro\raisebox
% |\raisebox{|\meta{distance}|}[|\meta{height}|][|\meta{depth}^^A
% |]{|\meta{box}|}| :\\
% Raises \meta{box} up by \meta{distance} length (down if
% \meta{distance} negative). Makes \TeX\ think that the new box extends
% \meta{height} above the line and \meta{depth} below, for a total
% vertical length of \meta{height}+\meta{depth}. Default values of
% \meta{height} \& \meta{depth} = actual height and depth of box in new
% position.
%
% \StopEventually{}
%
% \changes{v0.1e}{1994/03/02}{Remove need for drv file}
% \changes{v0.1e}{1994/03/02}{Add 2ekernel module}
% \changes{v1.0a}{1994/03/07}{Unify format with other Kernel files}
% \changes{v1.0f}{1994/05/11}
% {Superfluous braces removed from several commands}
% \changes{v1.0j}{1994/10/18}
% {stuff from ltpatch done}
% \changes{v1.0p}{1994/11/09}
% {more colour changes\ldots}
% \changes{v1.0q}{1994/11/17}
% {\cs{@tempa} to \cs{reserved@a}}
% \changes{v1.0t}{1995/05/07}{Use \cs{hb@xt@}}
% \changes{v1.0w}{1995/10/16}{Clarify makebox description}
% \begin{macrocode}
%<*2ekernel>
\message{boxes,}
% \end{macrocode}
%
% \begin{macro}{\makebox}
% \changes{v0.1a}{1993/12/03}
% {modified}
% |\makebox| User level command just looks for optional |[| or |(|.
% \changes{v1.1h}{2015/01/08}{Make Robust (latexrelease)}
% \begin{macrocode}
%</2ekernel>
%<latexrelease>\IncludeInRelease{2015/01/01}%
%<latexrelease> {\makebox}{Make \makebox robust}%
%<*2ekernel|latexrelease>
\DeclareRobustCommand\makebox{%
\leavevmode
\@ifnextchar(%)
\@makepicbox
{\@ifnextchar[\@makebox\mbox}}%
%</2ekernel|latexrelease>
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000/00/00}%
%<latexrelease> {\makebox}{Make \makebox robust}%
%<latexrelease>\def\makebox{%
%<latexrelease> \leavevmode
%<latexrelease> \@ifnextchar(%)
%<latexrelease> \@makepicbox
%<latexrelease> {\@ifnextchar[\@makebox\mbox}}%
%<latexrelease>\expandafter\let\csname makebox \endcsname\@undefined
%<latexrelease>\EndIncludeInRelease
%<*2ekernel>
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\mbox}
% \changes{v0.1a}{1993/12/03}
% {extra group}
% \changes{v1.0j}{1994/10/18}
% {\cs{long} added}
% The basic horizontal box command for \LaTeX.
% \begin{macrocode}
\DeclareRobustCommand\mbox[1]{\leavevmode\hbox{#1}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@makebox}
% \changes{v0.1a}{1993/12/03}
% {default changed from x to c}
% Look for a possible second optional argument (defaults to |c|).
% \begin{macrocode}
\def\@makebox[#1]{%
\@ifnextchar [{\@imakebox[#1]}{\@imakebox[#1][c]}}
% \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\@begin@tempboxa}
% \changes{v0.1a}{1993/12/03}
% {macro added}
% \changes{v0.1b}{1993/12/08}
% {Extra braces for color support
% (braces removed from other macros)}
% \changes{v1.0f}{1994/05/11}
% {Use new \cs{color@setgroup} concept.}
% Helper macro for supporting |\height|, |\width| etc. Grab |#1| into
% |\@tempboxa| and measure it.
% \begin{macrocode}
\long\def\@begin@tempboxa#1#2{%
\begingroup
\setbox\@tempboxa#1{\color@begingroup#2\color@endgroup}%
\def\width{\wd\@tempboxa}%
\def\height{\ht\@tempboxa}%
\def\depth{\dp\@tempboxa}%
\let\totalheight\@ovri
\totalheight\height
\advance\totalheight\depth}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@end@tempboxa}
% \changes{v0.1a}{1993/12/03}
% {macro added}
% End the group started by |\@begin@tempboxa|, so that the scope of
% |\height| only includes the `length' argument to the user-command.
% \begin{macrocode}
\let\@end@tempboxa\endgroup
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\bm@c}
% \begin{macro}{\bm@l}
% \begin{macro}{\bm@r}
% \begin{macro}{\bm@s}
% \begin{macro}{\bm@t}
% \begin{macro}{\bm@b}
% \changes{v0.1a}{1993/12/03}
% {macros added}
% Set up spacing.
% \begin{macrocode}
\def\bm@c{\hss\unhbox\@tempboxa\hss}
\def\bm@l{\unhbox\@tempboxa\hss}\let\bm@t\bm@l
\def\bm@r{\hss\unhbox\@tempboxa}\let\bm@b\bm@r
\def\bm@s{\unhbox\@tempboxa}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@imakebox}
% \changes{v0.1a}{1993/12/03}
% {macro modified}
% Internal form of |\makebox|.
% \begin{macrocode}
\long\def\@imakebox[#1][#2]#3{%
\@begin@tempboxa\hbox{#3}%
\setlength\@tempdima{#1}% support calc
\hb@xt@\@tempdima{\csname bm@#2\endcsname}%
\@end@tempboxa}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@makepicbox}
% \changes{v0.1a}{1993/12/03}
% {macro modified}
% Picture mode form of |\makebox|.
% \begin{macrocode}
\def\@makepicbox(#1,#2){%
\@ifnextchar[{\@imakepicbox(#1,#2)}{\@imakepicbox(#1,#2)[]}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@imakepicbox}
% picture mode version
% \begin{macrocode}
\long\def\@imakepicbox(#1,#2)[#3]#4{%
\vbox to#2\unitlength
{\let\mb@b\vss \let\mb@l\hss\let\mb@r\hss
\let\mb@t\vss
\@tfor\reserved@a :=#3\do{%
\if s\reserved@a
\let\mb@l\relax\let\mb@r\relax
\else
\expandafter\let\csname mb@\reserved@a\endcsname\relax
\fi}%
\mb@t
\hb@xt@ #1\unitlength{\mb@l #4\mb@r}%
\mb@b
% \end{macrocode}
% This kern ensures that a |b| option aligns on the bottom of the
% text rather than the baseline. this is the documented behaviour in
% the \LaTeX Book. The kern is removed in compatibility mode.
% \begin{macrocode}
\kern\z@}}
% \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\set@color}
% \changes{v0.1a}{1993/12/03}
% {macro added}
% \changes{v0.1a}{1993/12/03}
% {color support}
% This macro is initially a no-op, but the colour package will redefine
% it to insert a |\special|.
% \begin{macrocode}
\let\set@color\relax
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\color@begingroup}
% \changes{v1.0b}{1994/03/14}
% {macro added for colour support}
% \begin{macro}{\color@endgroup}
% \changes{v1.0b}{1994/03/14}
% {macro added for colour support}
% \begin{macro}{\color@setgroup}
% \changes{v1.0f}{1994/05/11}
% {macro added for colour support}
% \begin{macro}{\normalcolor}
% \changes{v1.0g}{1994/05/12}
% {macro added for colour support}
% \begin{macro}{\color@hbox}
% \changes{v1.0n}{1994/11/05}
% {macro added for colour support}
% \begin{macro}{\color@vbox}
% \changes{v1.0r}{1994/11/18}
% {macro added for colour support}
% \begin{macro}{\color@endbox}
% \changes{v1.0n}{1994/11/05}
% {macro added for colour support}
% These macros are initially a no-op, but the colour package will
% redefine them to be |\begingroup|, |\endgroup|,
% |\begingroup\set@color|,\\ |\hbox\bgroup\color@begingroup|,
% |\color@endgroup\egroup|.
% and \meta{set to main document colour} respectively.
% \begin{macrocode}
\let\color@begingroup\relax
\let\color@endgroup\relax
\let\color@setgroup\relax
\let\normalcolor\relax
\let\color@hbox\relax
\let\color@vbox\relax
\let\color@endbox\relax
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\newsavebox}
% \changes{v0.1a}{1993/12/03}
% {Pass the whole of arg 1 to \cs{@ifdefinable}}
% Allocate a new `savebox'.
% \begin{macrocode}
\def\newsavebox#1{\@ifdefinable{#1}{\newbox#1}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\savebox}
% Save |#1| in a box register.
% \changes{v1.1h}{2015/01/08}{Make Robust (latexrelease)}
% \begin{macrocode}
%</2ekernel>
%<latexrelease>\IncludeInRelease{2015/01/01}%
%<latexrelease> {\savebox}{Make \savebox robust}%
%<*2ekernel|latexrelease>
\DeclareRobustCommand\savebox[1]{%
\@ifnextchar(%)
{\@savepicbox#1}{\@ifnextchar[{\@savebox#1}{\sbox#1}}}%
%</2ekernel|latexrelease>
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000/00/00}%
%<latexrelease> {\savebox}{Make \savebox robust}%
%<latexrelease>\def\savebox#1{%
%<latexrelease> \@ifnextchar(%)
%<latexrelease> {\@savepicbox#1}{\@ifnextchar[{\@savebox#1}{\sbox#1}}}%
%<latexrelease>\expandafter\let\csname savebox \endcsname\@undefined
%<latexrelease>\EndIncludeInRelease
%<*2ekernel>
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\sbox}
% \changes{v0.1a}{1993/12/03}
% {extra group}
% \changes{v0.1a}{1993/12/03}
% {color support}
% \changes{v1.0b}{1994/03/14}
% {Use \cs{color@setgroup}}
% \changes{v1.0j}{1994/10/18}
% {\cs{long} added}
% Save |#1| in a box register.
% \begin{macrocode}
\DeclareRobustCommand\sbox[2]{\setbox#1\hbox{%
\color@setgroup#2\color@endgroup}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@savebox}
% \changes{v0.1a}{1993/12/03}
% {default c not x}
% Look for second optional argument.
% \begin{macrocode}
\def\@savebox#1[#2]{%
\@ifnextchar [{\@isavebox#1[#2]}{\@isavebox#1[#2][c]}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@isavebox}
% \changes{v0.1a}{1993/12/03}
% {extra group}
% \changes{v0.1a}{1993/12/03}
% {color support}
% \changes{v1.0b}{1994/03/14}
% {Use \cs{color@setgroup}}
% \changes{v1.0d}{1994/04/15}
% {Added missing procent character.}
% \changes{v1.0v}{1995/07/20}
% {Use \cs{sbox}}
% \begin{macrocode}
\long\def\@isavebox#1[#2][#3]#4{%
\sbox#1{\@imakebox[#2][#3]{#4}}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@savepicbox}
% Picture mode version of |\savebox|.
% \begin{macrocode}
\def\@savepicbox#1(#2,#3){%
\@ifnextchar[%]
{\@isavepicbox#1(#2,#3)}{\@isavepicbox#1(#2,#3)[]}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@isavepicbox}
% \changes{v0.1a}{1993/12/03}
% {extra group}
% \changes{v1.0b}{1994/03/14}
% {Use \cs{color@setgroup}}
% \changes{v1.0l}{1994/10/25}
% {missing percent (moved from ltpatch)}
% \changes{v1.0v}{1995/07/20}
% {Use \cs{sbox}}
% Picture mode version of |\savebox|.
% \begin{macrocode}
\long\def\@isavepicbox#1(#2,#3)[#4]#5{%
\sbox#1{\@imakepicbox(#2,#3)[#4]{#5}}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\lrbox}
% \changes{v0.1a}{1993/12/03}
% {macro added}
% \changes{v0.1a}{1993/12/03}
% {color support}
% \changes{v0.1b}{1993/12/08}
% {move \cs{@endpefalse} out of the inner group}
% \changes{v1.0b}{1994/03/14}
% {Use \cs{color@setgroup}}
% |lrbox|: the new environment form of |\sbox|. Use |\aftergroup| tricks
% to enable a \emph{local} assignment to be made to the box, in a way
% that it still has an effect \emph{outside} the |lrbox| environment.
% \begin{macrocode}
\def\lrbox#1{%
\edef\reserved@a{%
\endgroup
\setbox#1\hbox{%
\begingroup\aftergroup}%
\def\noexpand\@currenvir{\@currenvir}%
\def\noexpand\@currenvline{\on@line}}%
\reserved@a
\@endpefalse
\color@setgroup
\ignorespaces}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\endlrbox}
% \changes{v0.1a}{1993/12/03}
% {macro added}
% End the |lrbox| environment.
% \begin{macrocode}
\def\endlrbox{\unskip\color@endgroup}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\usebox}
% unchanged
% \begin{macrocode}
\DeclareRobustCommand\usebox[1]{\leavevmode\copy #1\relax}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\frame}
%
% The following definition of |\frame| was written by Pavel Curtis
% (Extra space removed 14 Jan 88)
% RmS 92/08/24: Replaced occurrence of |\@halfwidth| by |\@wholewidth|
% \begin{macrocode}
\DeclareRobustCommand\frame[1]{%
\leavevmode
\hbox{%
\hskip-\@wholewidth
\vbox{%
\vskip-\@wholewidth
\hrule \@height\@wholewidth
\hbox{%
\vrule\@width\@wholewidth
#1%
\vrule\@width\@wholewidth}%
\hrule\@height\@wholewidth
\vskip-\@wholewidth}%
\hskip-\@wholewidth}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\fboxrule}
% \begin{macro}{\fboxsep}
% user level parameters,
% \begin{macrocode}
\newdimen\fboxrule
\newdimen\fboxsep
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\fbox}
% Abbreviated framed box command.
% \changes{v0.1a}{1993/12/03}
% {extra group}
% \changes{v1.0g}{1994/05/12}
% {New definition, merged with \cs{framebox}}
% \changes{v1.0i}{1994/06/01}
% {New version, using \cs{@frameb@x}}
% \changes{v1.0j}{1994/10/18}
% {\cs{long} added}
% \changes{v1.0k}{1994/10/24}
% {Inner braces added (to fix latex/1061)}
% \changes{v1.0s}{1995/04/27}
% {Move \cs{leavevmode} for graphics/1512}
% \begin{macrocode}
\DeclareRobustCommand\fbox[1]{%
\leavevmode
\setbox\@tempboxa\hbox{%
\color@begingroup
\kern\fboxsep{#1}\kern\fboxsep
\color@endgroup}%
\@frameb@x\relax}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\framebox}
% Framed version of |\makebox|.
% \changes{v1.0g}{1994/05/12}
% {Merged \cs{fbox} and \cs{framebox}}
% \changes{v1.0i}{1994/06/01}
% {New version, so \cs{width} is correct in \cs{framebox}}
% \changes{v1.1h}{2015/01/08}{Make Robust (latexrelease)}
% \begin{macrocode}
%</2ekernel>
%<latexrelease>\IncludeInRelease{2015/01/01}%
%<latexrelease> {\framebox}{Make \framebox robust}%
%<*2ekernel|latexrelease>
\DeclareRobustCommand\framebox{%
\@ifnextchar(%)
\@framepicbox{\@ifnextchar[\@framebox\fbox}}%
%</2ekernel|latexrelease>
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000/00/00}%
%<latexrelease> {\framebox}{Make \framebox robust}%
%<latexrelease>\def\framebox{%
%<latexrelease> \@ifnextchar(%)
%<latexrelease> \@framepicbox{\@ifnextchar[\@framebox\fbox}}%
%<latexrelease>\expandafter\let\csname framebox \endcsname\@undefined
%<latexrelease>\EndIncludeInRelease
%<*2ekernel>
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@framebox}
% Deal with optional arguments.
% \begin{macrocode}
\def\@framebox[#1]{%
\@ifnextchar[%]
{\@iframebox[#1]}%
{\@iframebox[#1][c]}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@iframebox}
% The handling the optional arguments.
% \changes{v1.0i}{1994/06/01}
% {New version, so \cs{width} is correct in \cs{framebox}}
% \changes{v1.0j}{1994/10/18}
% {\cs{leavevmode} moved to \cs{@frameb@x}}
% \changes{v1.0s}{1995/04/27}
% {Move \cs{leavevmode} for graphics/1512}
% In order to set the whole box, including the frame to the
% specified dimension, we first determine that dimension
% from the natural size of the text, |#3|.
% calculated width.
% \begin{macrocode}
\long\def\@iframebox[#1][#2]#3{%
\leavevmode
\@begin@tempboxa\hbox{#3}%
\setlength\@tempdima{#1}%
\setbox\@tempboxa\hb@xt@\@tempdima
{\kern\fboxsep\csname bm@#2\endcsname\kern\fboxsep}%
\@frameb@x{\kern-\fboxrule}%
\@end@tempboxa}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@frameb@x}
% Common part of |\framebox| and |\fbox|. |#1| is a negative kern
% in the |\framebox| case so that the vertical rules do not add to the
% width of the box.
% \changes{v1.0i}{1994/06/01}
% {Macro added.}
% \changes{v1.0j}{1994/10/18}
% {\cs{leavevmode} added}
% \changes{v1.0s}{1995/04/27}
% {Move \cs{leavevmode} for graphics/1512}
% \begin{macrocode}
\def\@frameb@x#1{%
\@tempdima\fboxrule
\advance\@tempdima\fboxsep
\advance\@tempdima\dp\@tempboxa
\hbox{%
\lower\@tempdima\hbox{%
\vbox{%
\hrule\@height\fboxrule
\hbox{%
\vrule\@width\fboxrule
#1%
\vbox{%
\vskip\fboxsep
\box\@tempboxa
\vskip\fboxsep}%
#1%
\vrule\@width\fboxrule}%
\hrule\@height\fboxrule}%
}%
}%
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@framepicbox}
% Picture mode version.
% \begin{macrocode}
\def\@framepicbox(#1,#2){%
\@ifnextchar[{\@iframepicbox(#1,#2)}{\@iframepicbox(#1,#2)[]}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@iframepicbox}
% Picture mode version.
% \begin{macrocode}
\long\def\@iframepicbox(#1,#2)[#3]#4{%
\frame{\@imakepicbox(#1,#2)[#3]{#4}}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\parbox}
% \changes{v0.1a}{1993/12/03}
% {Redefined to support extra optional arguments}
% \changes{v0.1d}{1993/12/15}
% {Changed default from `c' to `s'}
% The main vertical-box command for \LaTeX.
% \changes{v1.1h}{2015/01/08}{Make Robust (latexrelease)}
% \begin{macrocode}
%</2ekernel>
%<latexrelease>\IncludeInRelease{2015/01/01}%
%<latexrelease> {\parbox}{Make \parbox robust}%
%<*2ekernel|latexrelease>
\DeclareRobustCommand\parbox{%
\@ifnextchar[%]
\@iparbox
{\@iiiparbox c\relax[s]}}%
%</2ekernel|latexrelease>
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000/00/00}%
%<latexrelease> {\parbox}{Make \parbox robust}%
%<latexrelease>\def\parbox{%
%<latexrelease> \@ifnextchar[%]
%<latexrelease> \@iparbox
%<latexrelease> {\@iiiparbox c\relax[s]}}%
%<latexrelease>\expandafter\let\csname parbox \endcsname\@undefined
%<latexrelease>\EndIncludeInRelease
%<*2ekernel>
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@iparbox}
% \changes{v0.1d}{1993/12/15}
% {Changed default from `c' to `s'}
% Optional argument handling.
% \begin{macrocode}
\def\@iparbox[#1]{%
\@ifnextchar[%]
{\@iiparbox{#1}}%
{\@iiiparbox{#1}\relax[s]}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@iiparbox}
% Optional argument handling.
% \begin{macrocode}
\def\@iiparbox#1[#2]{%
\@ifnextchar[%]
{\@iiiparbox{#1}{#2}}%
{\@iiiparbox{#1}{#2}[#1]}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@iiiparbox}
% \begin{macro}{\@parboxto}
% \changes{v1.0j}{1994/10/18}
% {Macro added to remove misuse of \cs{@empty}}
% \changes{v0.1b}{1993/12/08}
% {\cs{endgraf} added due to extra group in \cs{@begin@tempboxa}}
% \changes{v1.0y}{1996/06/10}
% {(DPC) Changed \cs{endgraf} to \cs{@@par}}
% \changes{v1.1f}{1999/04/27}
% {(CAR) Changed \cs{@empty} to \cs{relax} as flag for natural
% width: pr/2975}
% \changes{v1.1g}{2006/05/18}
% {Ensure \cs{@parboxto} holds the value of \cs{@tempdimb} not the
% register itself (pr/3867)}
% The internal version of |\parbox|.
% \begin{macrocode}
\let\@parboxto\@empty
\long\def\@iiiparbox#1#2[#3]#4#5{%
\leavevmode
\@pboxswfalse
\setlength\@tempdima{#4}%
\@begin@tempboxa\vbox{\hsize\@tempdima\@parboxrestore#5\@@par}%
\ifx\relax#2\else
\setlength\@tempdimb{#2}%
\edef\@parboxto{to\the\@tempdimb}%
\fi
\if#1b\vbox
\else\if #1t\vtop
\else\ifmmode\vcenter
\else\@pboxswtrue $\vcenter
\fi\fi\fi
\@parboxto{\let\hss\vss\let\unhbox\unvbox
\csname bm@#3\endcsname}%
\if@pboxsw \m@th$\fi
\@end@tempboxa}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \changes{v1.0c}{1994/04/12}
% {Remove \cs{@acci}, now defined in ltplain.dtx}
% \changes{v1.0c}{1994/04/12}
% {Remove \cs{@dischyph}, now defined in ltinit.dtx}
%
% \begin{macro}{\@arrayparboxrestore}
% Restore various paragraph parameters.
%
% The rational for allowing two normally global flags to be set
% locally here was stated originally by
% Donald Arsenau and extended by Chris Rowley.
% It is because these flags are only set globally to
% true by section commands, and these should never appear within
% boxes or, indeed, in any group; and they are only ever
% set globally to false when they are definitely true.
%
% If anyone is unhappy with this argument then both flags should be
% treated as in |\set@nobreak|; otherwise this command will be
% redundant.
% \changes{v1.1a}{1996/10/24}{Added local settings of flags: dangerous!!}
% \begin{macrocode}
%</2ekernel>
%<latexrelease>\IncludeInRelease{2017-04-15}%
%<latexrelease> {\normallineskiplimit}
%<latexrelease> {reset \lineskiplimit}%
%<*2ekernel|latexrelease>
\def\@arrayparboxrestore{%
\let\if@nobreak\iffalse
\let\if@noskipsec\iffalse
\let\par\@@par
\let\-\@dischyph
% \end{macrocode}
% Redefined accents to allow changes in font encoding
% \changes{v1.0h}{1994/05/13}
% {New accent system, use \cs{let} not \cs{def}}
% \begin{macrocode}
\let\'\@acci\let\`\@accii\let\=\@acciii
\parindent\z@ \parskip\z@skip
\everypar{}%
\linewidth\hsize
\@totalleftmargin\z@
\leftskip\z@skip \rightskip\z@skip \@rightskip\z@skip
\parfillskip\@flushglue
\lineskip\normallineskip
% \end{macrocode}
% \changes{v1.3a}{2017/03/29}
% {Reset \cs{lineskiplimit}}
% \begin{macrocode}
\lineskiplimit\normallineskiplimit
% \end{macrocode}
%
% \begin{macrocode}
\baselineskip\normalbaselineskip
\sloppy}
%</2ekernel|latexrelease>
% \end{macrocode}
%
% \begin{macrocode}
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000-00-00}%
%<latexrelease> {\normallineskiplimit}
%<latexrelease> {reset \lineskiplimit}%
%<latexrelease>\def\@arrayparboxrestore{%
%<latexrelease> \let\if@nobreak\iffalse
%<latexrelease> \let\if@noskipsec\iffalse
%<latexrelease> \let\par\@@par
%<latexrelease> \let\-\@dischyph
%<latexrelease> \let\'\@acci\let\`\@accii\let\=\@acciii
%<latexrelease> \parindent\z@ \parskip\z@skip
%<latexrelease> \everypar{}%
%<latexrelease> \linewidth\hsize
%<latexrelease> \@totalleftmargin\z@
%<latexrelease> \leftskip\z@skip \rightskip\z@skip \@rightskip\z@skip
%<latexrelease> \parfillskip\@flushglue \lineskip\normallineskip
%<latexrelease> \baselineskip\normalbaselineskip
%<latexrelease> \sloppy}
%<latexrelease>\EndIncludeInRelease
%<*2ekernel>
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\parboxrestore}
% Restore various paragraph parameters, and also |\\|.
% \begin{macrocode}
\def\@parboxrestore{\@arrayparboxrestore\let\\\@normalcr}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\if@minipage}
% Switch that is true at the start of a minipage.
% \changes{v1.0z}{1996/07/26}{put \cs{global} into definition}
% \begin{macrocode}
\def\@minipagefalse{\global\let\if@minipage\iffalse}
\def\@minipagetrue {\global\let\if@minipage\iftrue}
\@minipagefalse
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\minipage}
% \changes{v0.1a}{1993/12/03}
% {Redefined to support extra optional arguments}
% \changes{v0.1d}{1993/12/15}
% {extra space removed.}
% \changes{v0.1d}{1993/12/15}
% {Changed default from `c' to `s'}
% Essentially an environment form of |\parbox|.
% \begin{macrocode}
\def\minipage{%
\@ifnextchar[%]
\@iminipage
{\@iiiminipage c\relax[s]}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@iminipage}
% \changes{v0.1d}{1993/12/15}
% {Changed default from `c' to `s'}
% Optional argument handling.
% \begin{macrocode}
\def\@iminipage[#1]{%
\@ifnextchar[%]
{\@iiminipage{#1}}%
{\@iiiminipage{#1}\relax[s]}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@iiminipage}
% Optional argument handling.
% \begin{macrocode}
\def\@iiminipage#1[#2]{%
\@ifnextchar[%]
{\@iiiminipage{#1}{#2}}%
{\@iiiminipage{#1}{#2}[#1]}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@iiiminipage}
% \changes{v1.0e}{1994/04/21}
% {Extra \cs{bgroup} for colour}
% \changes{v1.0f}{1994/05/11}
% {Use new \cs{color@setgroup} concept.}
% Internal form of |minipage|.
% \changes{v1.1a}{1996/10/24}{Use it or lose it (@setminpage): Frank
% will want to lose it}
% \begin{macrocode}
\def\@iiiminipage#1#2[#3]#4{%
\leavevmode
\@pboxswfalse
\setlength\@tempdima{#4}%
\def\@mpargs{{#1}{#2}[#3]{#4}}%
\setbox\@tempboxa\vbox\bgroup
\color@begingroup
\hsize\@tempdima
\textwidth\hsize \columnwidth\hsize
\@parboxrestore
\def\@mpfn{mpfootnote}\def\thempfn{\thempfootnote}\c@mpfootnote\z@
\let\@footnotetext\@mpfootnotetext
\let\@listdepth\@mplistdepth \@mplistdepth\z@
\@minipagerestore
\@setminipage}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@minipagerestore}
% Hook so that other styles can reset other commands in a minipage.
% \begin{macrocode}
\let\@minipagerestore=\relax
% \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\endminipage}
% \changes{LaTeX209}{1992/08/14}
% {(RmS) replaced \cs{vskip}-\cs{lastskip} by \cs{unskip}
% (proposed by FMi)}
% \changes{v1.0e}{1994/04/21}
% {Extra \cs{egroup} for colour}
% \changes{v1.0f}{1994/05/11}
% {Use new \cs{color@setgroup} concept.}
% \changes{v1.0n}{1994/11/05}
% {Colour resetting for footnotes moved to here: as for main
% page.}
% \begin{macrocode}
\def\endminipage{%
\par
\unskip
\ifvoid\@mpfootins\else
\vskip\skip\@mpfootins
\normalcolor
\footnoterule
\unvbox\@mpfootins
\fi
\@minipagefalse %% added 24 May 89
\color@endgroup
\egroup
\expandafter\@iiiparbox\@mpargs{\unvbox\@tempboxa}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@mplistdepth}
% \begin{macro}{\@mpfootins}
% Versions of |\@listdepth| and |\footins| local to minipage.
% \begin{macrocode}
\newcount\@mplistdepth
\newinsert\@mpfootins
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@mpfootnotetext}
% Minipage version of |\@footnotetext|.
%
% Final |\strut| added 27 Mar 89, on suggestion by Don Hosek
% \changes{LaTeX2.09}{1991/09/29}{(RmS) added \cs{reset@font}}
% \changes{LaTeX2.09}{1992/11/26}{(RmS) added protection for \cs{edef}}
% \changes{v0.1a}{1994/03/07}{Extra group for colour}
% \changes{v1.0e}{1994/04/21}
% {Extra \cs{endgraf} for colour}
% \changes{v1.0f}{1994/05/11}
% {Use new \cs{color@setgroup} concept.}
% \changes{v1.0f}{1994/05/11}
% {Use new \cs{normalcolor} and \cs{@finalstrut}.}
% \changes{v1.0m}{1994/11/04}
% {Added \cs{protected@edef}. ASAJ.}
% \changes{v1.0n}{1994/11/05}
% {Colour resetting for footnotes moved to endminipage: as for main
% page.}
% \changes{v1.0o}{1994/11/05}
% {Colour groups restored here.}
% \begin{macrocode}
\long\def\@mpfootnotetext#1{%
\global\setbox\@mpfootins\vbox{%
\unvbox\@mpfootins
\reset@font\footnotesize
\hsize\columnwidth
\@parboxrestore
\protected@edef\@currentlabel
{\csname p@mpfootnote\endcsname\@thefnmark}%
\color@begingroup
\@makefntext{%
\rule\z@\footnotesep\ignorespaces#1\@finalstrut\strutbox}%
\color@endgroup}}
% \end{macrocode}
% \end{macro}
%
% \begin{macrocode}
\newif\if@pboxsw
% \end{macrocode}
%
% \begin{macro}{\rule}
% Draw a rule of the specified size.
% \changes{v1.1h}{2015/01/08}{Make Robust (latexrelease)}
% \begin{macrocode}
%</2ekernel>
%<latexrelease>\IncludeInRelease{2015/01/01}%
%<latexrelease> {\rule}{Make \rule robust}%
%<*2ekernel|latexrelease>
\DeclareRobustCommand\rule{\@ifnextchar[\@rule{\@rule[\z@]}}%
%</2ekernel|latexrelease>
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000/00/00}%
%<latexrelease> {\rule}{Make \rule robust}%
%<latexrelease>\def\rule{\@ifnextchar[\@rule{\@rule[\z@]}}%
%<latexrelease>\expandafter\let\csname rule \endcsname\@undefined
%<latexrelease>\EndIncludeInRelease
%<*2ekernel>
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@rule}
% Internal form of |\rule|.
% \changes{v1.1c}{1998/06/04}{Support calc-expressions}
% \begin{macrocode}
\def\@rule[#1]#2#3{%
\leavevmode
\hbox{%
\setlength\@tempdima{#1}%
\setlength\@tempdimb{#2}%
\setlength\@tempdimc{#3}%
\advance\@tempdimc\@tempdima
\vrule\@width\@tempdimb\@height\@tempdimc\@depth-\@tempdima}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@underline}
% Saved primitive |\underline|.
% \begin{macrocode}
\let\@@underline\underline
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\underline}
% \LaTeX\ version works outside math.
% \task{???}{why the second `relax in `underline ?}
% \begin{macrocode}
\DeclareRobustCommand\underline[1]{%
\relax
\ifmmode\@@underline{#1}%
\else $\@@underline{\hbox{#1}}\m@th$\relax\fi}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\raisebox}
% \changes{v0.1a}{1993/12/03}
% {redefined to support \cs{height}}
% \changes{v1.0s}{1995/04/27}
% {Move \cs{leavevmode} for graphics/1512}
% Raise a box, and change its vertical dimensions.
% \changes{v1.1h}{2015/01/08}{Make Robust (latexrelease)}
% \begin{macrocode}
%</2ekernel>
%<latexrelease>\IncludeInRelease{2015/01/01}%
%<latexrelease> {\raisebox}{Make \raisebox robust}%
%<*2ekernel|latexrelease>
\DeclareRobustCommand\raisebox[1]{%
\leavevmode
\@ifnextchar[{\@rsbox{#1}}{\@irsbox{#1}[]}}
%</2ekernel|latexrelease>
%<latexrelease>\EndIncludeInRelease
%<latexrelease>\IncludeInRelease{0000/00/00}%
%<latexrelease> {\raisebox}{Make \raisebox robust}%
%<latexrelease>\def\raisebox#1{%
%<latexrelease> \leavevmode
%<latexrelease> \@ifnextchar[{\@rsbox{#1}}{\@irsbox{#1}[]}}
%<latexrelease>\expandafter\let\csname raisebox \endcsname\@undefined
%<latexrelease>\EndIncludeInRelease
%<*2ekernel>
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@rsbox}
% Optional argument handling.
% \begin{macrocode}
\def\@rsbox#1[#2]{%
\@ifnextchar[{\@iirsbox{#1}[#2]}{\@irsbox{#1}[#2]}}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@argrsbox}
% \changes{v0.1a}{1993/12/03}
% {macro removed}
% ...
% \end{macro}
%
% \begin{macro}{\@irsbox}
% \changes{v0.1a}{1993/12/03}
% {redefined to support \cs{height}}
% \changes{v0.1b}{1993/12/08}
% {fix typo}
% \changes{v0.1c}{1993/12/09}
% {fix another typo}
% \changes{v0.1f}{1994/03/03}
% {Replaced a missing \cs{else}}
% \changes{v1.0s}{1995/04/27}
% {Move \cs{leavevmode} for graphics/1512}
% \changes{v1.0u}{1995/05/17}
% {Removed surplus braces}
% Internal version of |\raisebox| (less than two optional args).
% \begin{macrocode}
\long\def\@irsbox#1[#2]#3{%
\@begin@tempboxa\hbox{#3}%
\setlength\@tempdima{#1}%
\ifx\\#2\\\else\setlength\@tempdimb{#2}\fi
\setbox\@tempboxa\hbox{\raise\@tempdima\box\@tempboxa}%
\ifx\\#2\\\else\ht\@tempboxa\@tempdimb\fi
\box\@tempboxa
\@end@tempboxa}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@iirsbox}
% \changes{v0.1a}{1993/12/03}
% {redefined to support \cs{height}}
% \changes{v1.0s}{1995/04/27}
% {Move \cs{leavevmode} for graphics/1512}
% Internal version of |\raisebox| (two optional args).
% \begin{macrocode}
\long\def\@iirsbox#1[#2][#3]#4{%
\@begin@tempboxa\hbox{#4}%
\setlength\@tempdima{#1}%
\setlength\@tempdimb{#2}%
\setlength\dimen@{#3}%
\setbox\@tempboxa\hbox{\raise\@tempdima\box\@tempboxa}%
\ht\@tempboxa\@tempdimb
\dp\@tempboxa\dimen@
\box\@tempboxa
\@end@tempboxa}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@finalstrut}
% This macro adds a special strut the \emph{depth} of the box given as
% |#1|, and height and width 0pt. It is used for ensuring that the
% last line of a paragraph has the correct depth in `p' columns of
% tables and in footnotes. In vertical mode nothing is done, as adding
% the strut (as done in 2.09) would start a new paragraph. It would be
% possible to inspect |\prevdepth| to check the depth of the
% just-completed paragraph, but we do not do that here.
% \changes{v1.0g}{1994/05/12}
% {macro added}
% Actually we do even less now, skip the vmode test as it broke tabular
% `p' columns.
% \changes{v1.0p}{1994/11/09}
% {Revert \cs{finalstrut} to 2.09 equivalent (from ltpatch)}.
% \changes{v1.0x}{1995/10/31}
% {Add \cs{nobreak} in horiz mode to allow hyphenation.
% internal/1931}
%
% The |\nobreak| was added (1995/10/31) to allow hyphenation of the
% final word of the paragraph.
% \begin{macrocode}
\def\@finalstrut#1{%
\unskip\ifhmode\nobreak\fi\vrule\@width\z@\@height\z@\@depth\dp#1}
% \end{macrocode}
% \end{macro}
%
%
% \subsection{Some low-level constructs}
%
% The following commands are basically inherited from plain \TeX.
%
% \begin{macro}{\leftline}
% \begin{macro}{\rightline}
% \begin{macro}{\centerline}
% \begin{macro}{\@@line}
% These macros place text on a full line either centred or left or
% right adjusted.
% \begin{macrocode}
\def\@@line{\hb@xt@\hsize}
\DeclareRobustCommand\leftline[1]{\@@line{#1\hss}}
\DeclareRobustCommand\rightline[1]{\@@line{\hss#1}}
\DeclareRobustCommand\centerline[1]{\@@line{\hss#1\hss}}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
%
% \begin{macro}{\rlap}
% \begin{macro}{\llap}
% These macros place text to the left or right of the current
% reference point without taking up space.
% \end{macro}
% \begin{macrocode}
\DeclareRobustCommand\rlap[1]{\hb@xt@\z@{#1\hss}}
\DeclareRobustCommand\llap[1]{\hb@xt@\z@{\hss#1}}
% \end{macrocode}
% \end{macro}
%
% \begin{macrocode}
%</2ekernel>
% \end{macrocode}
%
% \Finale
\endinput
%
% \Finale
%
