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+% \iffalse meta-comment
+%
+% Copyright 1993-2017
+% 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
+%%
+%
+%
+% \changes{v2.1a}{1994/03/10}{Update for \LaTeXe}
+%
+% \DoNotIndex{\@cclvi,\@cclv,\@gobble,\@gobbletwo,\@ifnextchar}
+% \DoNotIndex{\@M,\@tempboxa,\advance,\alloc,\begingroup,\bgroup}
+% \DoNotIndex{\box,\count@,\def,\do,\docdate,\egroup,\endgroup}
+% \DoNotIndex{\fi,\filedate,\fileversion,\font,\fontdimen,\global}
+% \DoNotIndex{\ifinner,\ifnum,\immediate,\let,\long,\loop,\m@ne}
+% \DoNotIndex{\noexpand,\relax,\repeat,\scriptfont}
+% \DoNotIndex{\scriptscriptfont,\setbox,\sixt@@n,\space,\textfont}
+% \DoNotIndex{\toks,\toksdef,\write,\xdef,\z@}%
+%
+%
+%\title{The file \texttt{syntonly.dtx} for use with
+% \LaTeXe.\thanks{This file has version
+% number \fileversion, dated \filedate.}\\[2pt]
+% It contains the code for \texttt{syntonly.sty}}
+% \author{Frank Mittelbach \and Rainer Sch\"opf}
+%
+%
+% \MaintainedByLaTeXTeam{latex}
+% \maketitle
+%
+% This package implements the |\syntaxonly| declaration for \LaTeXe.
+% This command can be used in the preamble for running a document
+% through \LaTeX{} without actually getting any output.
+%
+% \StopEventually{}
+%
+%
+% \section{Identification}
+%
+% We identify the package and its current version.
+% \changes{v2.1b}{1995/04/22}{Removed surplus \cs{typeout} lines}
+% \changes{v2.1c}{1996/06/14}{Rearrange \cs{GetFileInfo} usage.}
+% \changes{v2.1d}{1998/08/17}{(RmS) Minor documentation fixes.}
+%
+% \begin{macrocode}
+%<package>\ProvidesPackage{syntonly}
+%<*dtx>
+ \ProvidesFile{syntonly.dtx}
+%</dtx>
+%<*package|dtx>
+ [2017/06/30 v2.1e Standard LaTeX2e package]
+%</package|dtx>
+% \end{macrocode}
+%
+%\iffalse
+%
+% \section{The documentation driver file}
+%
+% The next bit of code contains the documentation driver file for
+% \TeX{}, i.e., the file that will produce the documentation you are
+% currently reading. It will be extracted from this file by the \dst{}
+% program.
+% \begin{macrocode}
+%<*driver>
+\documentclass{ltxdoc}
+\GetFileInfo{syntonly.dtx}
+\providecommand\dst{\expandafter{\normalfont\scshape docstrip}}
+\begin{document}
+ \DocInput{syntonly.dtx}
+\end{document}
+%</driver>
+% \end{macrocode}
+%\fi
+%
+%
+% \section{Implementation}
+%
+% \begin{macrocode}
+%<*package>
+% \end{macrocode}
+%
+% \begin{macro}{\dummyft@}
+% First of all we need to define the `dummy' font.
+% \begin{macrocode}
+\font\dummyft@=dummy \relax
+% \end{macrocode}
+% \end{macro}
+% \changes{v2.1b}{1995/05/25}{Removed unneeded fontdimen settings for
+% dummyft@}
+%
+% \begin{macro}{\ifsyntax@}
+% Now we can define the `syntax only' feature. We define a switch
+% |\if@syntax| so that any macro can always find out if it
+% is really supposed to typeset text. Its default is to run in
+% normal mode.
+% \begin{macrocode}
+\newif\ifsyntax@
+\syntax@false
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\syntaxonly}
+% The |\syntaxonly| macro sets up everything for syntax
+% checking.
+% \begin{macrocode}
+\def\syntaxonly{%
+% \end{macrocode}
+% First of all it sets the |syntax@| switch to \texttt{true}.
+% \begin{macrocode}
+ \syntax@true
+% \end{macrocode}
+% Then it globally sets all fonts to the dummy font. These are:
+% the current font outside math mode,
+% \begin{macrocode}
+ \global\dummyft@
+% \end{macrocode}
+% and the $3\times16$ math fonts for the $16$ math \emph{groups}.
+% We use a loop to set these.
+% \begin{macrocode}
+ \count@\sixt@@n
+ \loop
+ \ifnum\count@ >\z@
+ \advance\count@\m@ne
+ \global\textfont\count@\dummyft@
+ \global\scriptfont\count@\dummyft@
+ \global\scriptscriptfont\count@\dummyft@
+ \repeat
+% \end{macrocode}
+% Since all font changes occur either via |\selectfont| (in
+% text or |\mathversion| (for math mode) it is sufficient
+% to change these to no-ops. In addition we must prevent
+% the loading of math fonts, this is done by making
+% |\getanddefine@fonts| a no-op.
+% \begin{macrocode}
+ \global\let\selectfont\relax
+ \global\let\mathversion\@gobble
+ \global\let\getanddefine@fonts\@gobbletwo
+% \end{macrocode}
+% We prevent \TeX{} from complaining about the dummy font
+% having no characters.
+% \begin{macrocode}
+ \tracinglostchars\z@
+% \end{macrocode}
+% Then we disable the output routine, and set |\frenchspacing|
+% (which is slightly faster than |\nonfrenchspacing|).
+% Finally we set |\hbadness| to $10000$ to avoid overfull box
+% messages.
+% \begin{macrocode}
+ \nopages@
+ \frenchspacing
+ \hbadness\@M}
+% \end{macrocode}
+% \end{macro}
+%
+% \changes{v2.1b}{1995/05/25}{Removed non-outer newtoks@: newtoks is no
+% longer outer}
+%
+% \begin{macro}{\nopages@}
+% \changes{v1.0b}{1990/01/14}{Rewrite of the \cs{nopages@} macro to
+% correctly handle footnote insertions, floats and marginpars.}
+% The |\nopages@| macro disables the \LaTeX{} output routine.
+% To this end we define a very simple output routine that empties
+% the output \emph{and} footnote boxes (remember that the latter
+% are insertions.
+% \begin{macrocode}
+\def\nopages@{%
+ \output {\setbox\z@\box\@cclv
+ \setbox\z@\box\footins
+ \deadcycles\z@}%
+% \end{macrocode}
+% Then we protect it against definition by a style file.
+% \changes{v2.1b}{1995/05/25}{newtoks is no longer outer}
+% \begin{macrocode}
+ \newtoks\output
+% \end{macrocode}
+% But this is not enough: normally the \LaTeX{} output routine
+% is responsible for dealing with floating objects.
+% We therefore also redefine the internal macros for handling
+% floats and marginpars.
+% \begin{macrocode}
+ \def\@xfloat##1[##2]{%
+% \end{macrocode}
+% There are a few things that have to be retained:
+% the definition of |\@captype| since it is used by the
+% |\caption| command,
+% \changes{v1.0c}{1990/01/16}{Definition of \cs{@captype} added.}
+% \begin{macrocode}
+ \def\@captype{##1}%
+% \end{macrocode}
+% the error message issued when not in outer paragraph mode,
+% \begin{macrocode}
+ \ifinner\@parmoderr\fi
+% \end{macrocode}
+% and the |\@parboxrestore| command for the body of the
+% float. This is necessary since it restores the original
+% definitions of important commands like |\par| or |\\|.
+% \begin{macrocode}
+ \setbox\@tempboxa\vbox\bgroup\@parboxrestore}%
+% \end{macrocode}
+% |\end@float| must now only close the brace:
+% \begin{macrocode}
+ \let\end@float\egroup
+% \end{macrocode}
+% The above would be enough also for two-column floats with the
+% kernel algorithm. However with the refined algorithm inside
+% \texttt{fixlxt2e} this doesn't any longer work, so there we also
+% need to explicitly overwrite the end macro for two-column floats
+% (the begin is still okay as it resolves to |\@xfloat| eventually).
+% \begin{macrocode}
+ \let\end@dblfloat\egroup
+% \end{macrocode}
+% The redefinition of the |\marginpar| command is a bit more
+% complicated since we have to check for the optional argument.
+% First we redefine the command itself:
+% \begin{macrocode}
+ \def\marginpar{\ifinner\@parmoderr\fi
+% \end{macrocode}
+% We open a group so that everything gathered in a temporary box
+% can easily be thrown away by closing it again (see below).
+% \begin{macrocode}
+ \begingroup \@ifnextchar [\@xmpar\@ympar}
+% \end{macrocode}
+% |\@xmpar| and |\@ympar| are now defined similar to
+% |\@xfloat| above.
+% If an optional argument is present |\@xmpar| typesets
+% it in a temporary box that is thrown away later.
+% Then it calls up |\@ympar| to process |\marginpar|'s
+% argument.
+% \changes{v1.0d}{1990/01/21}{Added forgotten \cs{vbox}.}
+% \begin{macrocode}
+ \long\def\@xmpar[##1]{%
+ \setbox\@tempboxa\vbox{\@parboxrestore ##1}\@ympar}%
+% \end{macrocode}
+% |\@ympar| gathers its argument in the same temporary box
+% and throws away its contents by closing the group opened up in
+% |\marginpar| above.
+% \changes{v1.0d}{1990/01/21}{Added forgotten \cs{vbox}.}
+% \begin{macrocode}
+ \long\def\@ympar##1{%
+ \setbox\@tempboxa\vbox{\@parboxrestore ##1}\endgroup}%
+% \end{macrocode}
+% And that's all we had to do.
+% \begin{macrocode}
+}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\@preamblecmds}
+% We disable the use of the |\syntaxonly| command after
+% |\begin{document}|
+% \begin{macrocode}
+\@onlypreamble\syntaxonly
+%</package>
+% \end{macrocode}
+% \end{macro}
+%
+% \Finale
+
+\endinput