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+% \iffalse meta-comment
+%
+% Copyright 1993-2016
+% 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 2005/12/01 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
+%%
+%% File `alltt.dtx'.
+%% Copyright (C) 1987 by Leslie Lamport
+%% Copyright (C) 1994--1997 LaTeX3 project, Johannes Braams
+%% all rights reserved.
+%%
+%<*dtx>
+\ProvidesFile{alltt.dtx}
+%</dtx>
+%<package>\NeedsTeXFormat{LaTeX2e}
+%<package>\ProvidesPackage{alltt}
+%<driver>\ProvidesFile{alltt.drv}
+%\ProvidesFile{alltt.dtx}
+ [1997/06/16 v2.0g defines alltt environment]
+%
+%<*driver>
+\documentclass{ltxdoc}
+\begin{document}
+\providecommand{\Lenv}[1]{\textsf{#1}}
+\providecommand{\pkg}[1]{\texttt{#1}}
+\providecommand{\file}[1]{\texttt{#1}}
+\DocInput{alltt.dtx}
+\end{document}
+%</driver>
+% \fi
+%
+% \changes{v2.0g}{1997/06/16}{A few documentation fixes (PR 2520)}
+% \changes{v2.0d}{1995/04/02}{A few documentation fixes (PR 1517)}
+%
+% \GetFileInfo{alltt.dtx}
+% \title{The \texttt{alltt} environment\thanks{This file
+% has version number \fileversion, last
+% revised \filedate.}}
+% \author{Johannes Braams}
+% \date{\filedate}
+% \MaintainedByLaTeXTeam{latex}
+% \maketitle
+%
+% \begin{abstract}
+% This package defines the \Lenv{alltt} environment, which is like
+% the \Lenv{verbatim} environment except that |\|, |{|, and |}|
+% have their usual meanings.
+%
+% Thus, other commands and environments can appear within an
+% \Lenv{alltt} environment.
+% \end{abstract}
+%
+% \section{Introduction}
+%
+% \DescribeEnv{alltt}
+% Here are some things you may want to do in an \Lenv{alltt}
+% environment:
+% \begin{itemize}
+% \item Change fonts--e.g., by typing |{\em emphasized text\/}|
+%
+% \item Insert text from a file \file{foo.tex} by typing
+% |\input{foo}|. Beware that each |<return>| starts a new line, so
+% if \file{foo.tex} ends with a |<return>| you can wind up with an
+% extra blank line if you're not careful.
+%
+% \item Insert a math formula. Note that |$| just produces a dollar
+% sign, so you'll have to type |\(...\)| or |\[...\]|. Also, |^|
+% and |_| just produce their characters; use |\sp| or |\sb| for
+% super- and subscripts, as in |\(x\sp{2}\)|.
+% \end{itemize}
+%
+% \StopEventually{}
+%
+% \section{The Implementation}
+%
+% \begin{macrocode}
+%<*package>
+% \end{macrocode}
+%
+% \begin{environment}{alltt}
+% The \Lenv{alltt} environment is similar to the \Lenv{verbatim}
+% environment, except that |\|, |{| and |}| have their usual
+% behaviour.
+% \changes{v2.0b}{1994/10/29}{Added a missing \cs{dospecials}}
+% \changes{v2.0c}{1995/01/27}{Reset \cs{dospecials} after its changed
+% version is executed}
+% \changes{v2.0e}{1995/05/13}{brought definition up to date with the
+% verbatim environment}
+% \changes{v2.0e}{1995/05/13}{Save and restore (in math mode) the
+% definition of the \texttt{'} character}
+% \begin{macrocode}
+\begingroup
+\lccode`\~=`\'
+\lowercase{\endgroup
+\newenvironment{alltt}{%
+ \trivlist
+ \item\relax
+ \if@minipage
+ \else
+ \vskip\parskip
+ \fi
+ \leftskip\@totalleftmargin
+ \rightskip\z@skip
+ \parindent\z@
+ \parfillskip\@flushglue
+ \parskip\z@skip
+ \@@par
+ \@tempswafalse
+ \def\par{%
+ \if@tempswa
+ \leavevmode\null\@@par\penalty\interlinepenalty
+ \else
+ \@tempswatrue
+ \ifhmode\@@par\penalty\interlinepenalty\fi
+ \fi}
+ \obeylines
+ \verbatim@font
+ \let\org@prime~%
+ \@noligs
+% \end{macrocode}
+% \changes{v2.0f}{1995/07/24}{Added setting of the \cs{catcode} of the
+% \texttt{'} character}
+% \begin{macrocode}
+ \everymath\expandafter{\the\everymath
+ \catcode`\'=12 \let~\org@prime}
+ \everydisplay\expandafter{\the\everydisplay
+ \catcode`\'=12 \let~\org@prime}
+ \let\org@dospecials\dospecials
+ \g@remfrom@specials{\\}
+ \g@remfrom@specials{\{}
+ \g@remfrom@specials{\}}
+ \let\do\@makeother
+ \dospecials
+ \let\dospecials\org@dospecials
+ \frenchspacing\@vobeyspaces
+ \everypar \expandafter{\the\everypar \unpenalty}}
+{\endtrivlist}}
+% \end{macrocode}
+% \end{environment}
+%
+% \begin{macro}{\g@remfrom@specials}
+% In the old implementation of the \pkg{alltt} package a fixed
+% |\dospecials| was used. However nowadays the |\dospecials|
+% command might contain more special characters at run-time then as
+% was defined in the format. Therefore we remove the necessary
+% special character from |\dospecials| at the start of the
+% \Lenv{alltt} environment. For this we need a macro. Remember that
+% the list of special characters in |\dospecials| contains the
+% control sequence |\do| between the characters. We use that to
+% check whether a character has to be removed.
+%
+% The macro |\g@remfrom@specials| takes one argument, the chracter
+% to be removed from the list.
+% \begin{macrocode}
+\def\g@remfrom@specials#1{%
+% \end{macrocode}
+% We build up a new list in |\@new@speicals|.
+% \begin{macrocode}
+ \def\@new@specials{}
+% \end{macrocode}
+% The command |\@remove| compares its argument with the argument of\\
+% |\g@remfrom@specials|.
+% \begin{macrocode}
+ \def\@remove##1{%
+ \ifx##1#1\else
+% \end{macrocode}
+% When they are not the same the argument of |\@remove| is added
+% (together with |\do|) to the new list.
+% \begin{macrocode}
+ \g@addto@macro\@new@specials{\do ##1}\fi}
+% \end{macrocode}
+% Now we |\let| |\do| be equal to |\@remove| and execute
+% |\dospecials|.
+% \begin{macrocode}
+ \let\do\@remove\dospecials
+% \end{macrocode}
+% All that's left is to make |\dospecials| point to the new list.
+% \begin{macrocode}
+ \let\dospecials\@new@specials
+ }
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macrocode}
+%</package>
+% \end{macrocode}
+%
+% \Finale
+\endinput