Extended tex & math support

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-% \iffalse
-%%    The preview style for extracting previews from LaTeX documents.
-%%    Developed as part of AUCTeX <URL:http://www.gnu.org/software/auctex>.
-%
-%     Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006,
-%                   2010 Free Software Foundation
-%
-%     This program is free software; you can redistribute it and/or modify
-%     it under the terms of the GNU General Public License as published by
-%     the Free Software Foundation; either version 3 of the License, or
-%     (at your option) any later version.
-%
-%     This program is distributed in the hope that it will be useful,
-%     but WITHOUT ANY WARRANTY; without even the implied warranty of
-%     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-%     GNU General Public License for more details.
-%
-%     You should have received a copy of the GNU General Public License
-%     along with this program; if not, write to the
-%     Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
-%     Boston, MA 02110-1301  USA
-% \fi
-% \CheckSum{1758}
-% \GetFileInfo{preview.sty}
-% \date{\filedate}
-% \author{David Kastrup\thanks{\texttt{dak@gnu.org}}}
-% \title{The \texttt{preview} Package for \LaTeX\\Version \fileversion}
-% \maketitle
-% \section{Introduction}
-% The main purpose of this package is the extraction of certain
-% environments (most notably displayed formulas) from \LaTeX\ sources
-% as graphics.  This works with DVI files postprocessed by either
-% Dvips and Ghostscript or dvipng, but it also works when you are
-% using PDF\TeX\ for generating PDF files (usually also postprocessed
-% by Ghostscript).
-%
-% Current uses of the package include the \previewlatex\ package for
-% WYSIWYG functionality in the AUC\TeX\ editing environment,
-% generation of previews in LyX, as part of the operation of the
-% ps4pdf package, the tbook XML system and some other tools.
-% 
-% Producing EPS files with Dvips and its derivatives using the
-% \texttt{-E} option is not a good alternative: People make do by
-% fiddling around with |\thispagestyle{empty}| and hoping for the best
-% (namely, that the specified contents will indeed fit on single
-% pages), and then trying to guess the baseline of the resulting code
-% and stuff, but this is at best dissatisfactory.  The preview package
-% provides an easy way to ensure that exactly one page per request
-% gets shipped, with a well-defined baseline and no page decorations.
-% While you still can use the preview package with the `classic'
-% \begin{quote}
-% |dvips -E -i|
-% \end{quote}
-% invocation, there are better ways available that don't rely on Dvips
-% not getting confused by PostScript specials.
-% 
-% For most applications, you'll want to make use of the |tightpage|
-% option.  This will embed the page dimensions into the PostScript or
-% PDF code, obliterating the need to use the |-E -i| options to Dvips.
-% You can then produce all image files with a single run of
-% Ghostscript from a single PDF or PostScript (as opposed to EPS)
-% file.
-% 
-% Various options exist that will pass \TeX\ dimensions and other
-% information about the respective shipped out material (including
-% descender size) into the log file, where external applications might
-% make use of it.
-% 
-% The possibility for generating a whole set of graphics with a single
-% run of Ghostscript (whether from \LaTeX\ or PDF\LaTeX) increases
-% both speed and robustness of applications.  It is also feasible to
-% use dvipng on a DVI file with the options
-% \begin{quote}
-%   |-picky -noghostscript|
-% \end{quote}
-% to omit generating any image file that requires Ghostscript, then
-% let a script generate all missing files using Dvips/Ghostscript.
-% This will usually speed up the process significantly.
-% 
-% \section{Package options}
-% The package is included with the customary
-% \begin{quote}
-% |\usepackage|\oarg{options}|{preview}|
-% \end{quote}
-% You should usually load this package as the last one, since it
-% redefines several things that other packages may also provide.
-% 
-% The following options are available:
-% \begin{description}
-% \item[|active|] is the most essential option.  If this option is not
-%   specified, the |preview| package will be inactive and the document
-%   will be typeset as if the |preview| package were not loaded,
-%   except that all declarations and environments defined by the
-%   package are still legal but have no effect.  This allows defining
-%   previewing characteristics in your document, and only activating
-%   them by calling \LaTeX\ as
-% \begin{quote}
-% \raggedright
-% |latex '\PassOptionsToPackage{active}{preview}| |\input|\marg{filename}|'|
-% \end{quote}
-% \item[|noconfig|] Usually the file |prdefault.cfg| gets loaded
-%   whenever the |preview| package gets activated.  |prdefault.cfg| is
-%   supposed to contain definitions that can cater for otherwise bad
-%   results, for example, if a certain document class would otherwise
-%   lead to trouble.  It also can be used to override any settings
-%   made in this package, since it is loaded at the very end of it.
-%   In addition, there may be configuration files specific for certain
-%   |preview| options like |auctex| which have more immediate needs.
-%   The |noconfig| option suppresses loading of those option files,
-%   too.
-% \item[|psfixbb|] Dvips determines the bounding boxes from the
-%   material in the DVI file it understands.  Lots of PostScript
-%   specials are not part of that.  Since the \TeX\ boxes do not make
-%   it into the DVI file, but merely characters, rules and specials
-%   do, Dvips might include far too small areas.  The option |psfixbb|
-%   will include |/dev/null| as a graphic file in the ultimate upper
-%   left and lower right corner of the previewed box.  This will make
-%   Dvips generate an appropriate bounding box.
-% \item[|dvips|] If this option is specified as a class option or to
-%   other packages, several packages pass things like page size
-%   information to Dvips, or cause crop marks or draft messages
-%   written on pages.  This seriously hampers the usability of
-%   previews.  If this option is specified, the changes will be undone
-%   if possible.
-% \item[|pdftex|] If this option is set, PDF\TeX\ is assumed as the
-%   output driver.  This mainly affects the |tightpage| option.
-% \item[|xetex|] If this option is set, Xe\TeX\ is assumed as the
-%   output driver.  This mainly affects the |tightpage| option.
-% \item[|displaymath|] will make all displayed math environments
-%   subject to preview processing.  This will typically be the most
-%   desired option.
-% \item[|floats|] will make all float objects subject to preview
-%   processing.  If you want to be more selective about what floats to
-%   pass through to a preview, you should instead use the
-%   \cmd{\PreviewSnarfEnvironment} command on the floats you want to
-%   have previewed.
-% \item[|textmath|] will make all text math subject to previews.
-%   Since math mode is used throughly inside of \LaTeX\ even for other
-%   purposes, this works by redefining \cmd\(, \cmd\)
-%   and |$| and the |math| environment (apparently some people use
-%   that).  Only occurences of these text math delimiters in later
-%   loaded packages and in the main document will thus be affected.
-% \item[|graphics|] will subject all \cmd{\includegraphics} commands
-%   to a preview.
-% \item[|sections|] will subject all section headers to a preview.
-% \item[|delayed|] will delay all activations and redefinitions the
-%   |preview| package makes until |\||begin{document}|.  The purpose
-%   of this is to cater for documents which should be subjected to the
-%   |preview| package without having been prepared for it.  You can
-%   process such documents with
-%   \begin{quote}
-%     |latex '\RequirePackage[active,delayed,|\meta{options}|]{preview}|
-%     |\input|\marg{filename}|'|
-%   \end{quote}
-%   This relaxes the requirement to be loading the |preview| package
-%   as last package.
-% \item[\meta{driver}] loads a special driver file
-%   |pr|\meta{driver}|.def|.  The remaining options are implemented
-%   through the use of driver files.
-% \item[|auctex|] This driver will produce fake error messages at the
-%   start and end of every preview environment that enable the Emacs
-%   package \previewlatex\ in connection with AUC\TeX\ to pinpoint
-%   the exact source location where the previews have originated.
-%   Unfortunately, there is no other reliable means of passing the
-%   current \TeX\ input position \emph{in} a line to external
-%   programs.  In order to make the parsing more robust, this option
-%   also switches off quite a few diagnostics that could be
-%   misinterpreted.
-% 
-%   You should not specify this option manually, since it will only be
-%   needed by automated runs that want to parse the pseudo error
-%   messages.  Those runs will then use \cmd{\PassOptionsToPackage} in
-%   order to effect the desired behaviour.  In addition,
-%   |prauctex.cfg| will get loaded unless inhibited by the |noconfig|
-%   option.  This caters for the most frequently encountered
-%   problematic commands.
-% \item[|showlabels|] During the editing process, some people like to
-%   see the label names in their equations, figures and the like.  Now
-%   if you are using Emacs for editing, and in particular
-%   \previewlatex, I'd strongly recommend that you check out the
-%   Ref\TeX\ package which pretty much obliterates the need for this
-%   kind of functionality.  If you still want it, standard \LaTeX\
-%   provides it with the |showkeys| package, and there is also the
-%   less encompassing |showlabels| package.  Unfortunately, since
-%   those go to some pain not to change the page layout and spacing,
-%   they also don't change |preview|'s idea of the \TeX\ dimensions of
-%   the involved boxes.  So if you are using |preview| for determing
-%   bounding boxes, those packages are mostly useless.  The option
-%   |showlabels| offers a substitute for them.
-% \item[|tightpage|] It is not uncommon to want to use the results of
-%   |preview| as graphic images for some other application.  One
-%   possibility is to generate a flurry of EPS files with
-%   \begin{quote}
-%     |dvips -E -i -Pwww -o| \meta{outputfile}|.000| \meta{inputfile}
-%   \end{quote}
-%   However, in case those are to be processed further into graphic
-%   image files by Ghostscript, this process is inefficient since all
-%   of those files need to be processed one by one.  In addition, it
-%   is necessary to extract the bounding box comments from the EPS
-%   files and convert them into page dimension parameters for
-%   Ghostscript in order to avoid full-page graphics.  This is not
-%   even possible if you wanted to use Ghostscript in a~\emph{single}
-%   run for generating the files from a single PostScript file, since
-%   Dvips will in that case leave no bounding box information
-%   anywhere.
-% 
-%   The solution is to use the |tightpage| option.  That way a single
-%   command line like
-%   \begin{quote}
-%     \raggedright
-%     \texttt{gs -sDEVICE=png16m -dTextAlphaBits=4 -r300
-%       -dGraphicsAlphaBits=4 -dSAFER -q -dNOPAUSE
-%       -sOutputFile=\meta{outputfile}\%d.png \meta{inputfile}.ps}
-%   \end{quote}
-%   will be able to produce tight graphics from a single PostScript
-%   file generated with Dvips \emph{without} use of the options
-%   |-E -i|, in a single run.
-%
-%   The |tightpage| option actually also works when using the |pdftex|
-%   option and generating PDF files with PDF\TeX.  The resulting PDF
-%   file has separate page dimensions for every page and can directly
-%   be converted with one run of Ghostscript into image files.
-%
-%   If neither |dvips| or |pdftex| have been specified, the
-%   corresponding option will get autodetected and invoked.
-%
-%   If you need this in a batch environment where you don't want to
-%   use |preview|'s automatic extraction facilities, no problem: just
-%   don't use any of the extraction options, and wrap everything to be
-%   previewed into |preview| environments.  This is how LyX does its
-%   math previews.
-% 
-%   If the pages under the |tightpage| option are just too tight, you
-%   can adjust by setting the length |\PreviewBorder| to a different
-%   value by using \cmd{\setlength}.  The default value is
-%   |0.50001bp|, which is half of a usual PostScript point, rounded
-%   up.  If you go below this value, the resulting page size may drop
-%   below |1bp|, and Ghostscript does not seem to like that.  If you
-%   need finer control, you can adjust the bounding box dimensions
-%   individually by changing the macro |\PreviewBbAdjust| with the
-%   help of |\renewcommand|.  Its default value is
-%   \begin{quote}
-%     \raggedright
-%     |\newcommand| |\PreviewBbAdjust|
-%       |{-\PreviewBorder| |-\PreviewBorder|
-%       |\PreviewBorder|  |\PreviewBorder}|
-%   \end{quote}
-%   This adjusts the left, lower, right and upper borders by the given
-%   amount.  The macro must contain 4~\TeX\ dimensions after another,
-%   and you may not omit the units if you specify them explicitly
-%   instead of by register.  PostScript points have the unit~|bp|.
-% \item[|lyx|] This option is for the sake of LyX developers.  It will
-%   output a few diagnostics relevant for the sake of LyX' preview
-%   functionality (at the time of writing, mostly implemented for math
-%   insets, in versions of LyX starting with 1.3.0).
-% \item[|counters|] This writes out diagnostics at the start and the
-%   end of previews.  Only the counters changed since the last output
-%   get written, and if no counters changed, nothing gets written at
-%   all.  The list consists of counter name and value, both enclosed
-%   in |{}| braces, followed by a space.  The last such pair is
-%   followed by a colon (|:|) if it is at the start of the preview
-%   snippet, and by a period (|.|) if it is at the end.  The order of
-%   different diagnostics like this being issued depends on the order
-%   of the specification of the options when calling the package.
-% 
-%   Systems like \previewlatex\ use this for keeping counters accurate
-%   when single previews are regenerated.
-% \item[|footnotes|] This makes footnotes render as previews, and only
-%   as their footnote symbol.  A convenient editing feature inside of
-%   Emacs.
-% \end{description}
-% The following options are just for debugging purposes of the package
-% and similar to the corresponding \TeX\ commands they allude to:
-% \begin{description}
-% \item[|tracingall|] causes lots of diagnostic output to appear in
-%   the log file during the preview collecting phases of \TeX's
-%   operation.  In contrast to the similarly named \TeX\ command, it
-%   will not switch to |\errorstopmode|, nor will it change the
-%   setting of |\tracingonline|.
-% \item[|showbox|] This option will show the contents of the boxes
-%   shipped out to the DVI files.  It also sets |\showboxbreadth| and
-%   |\showboxdepth| to their maximum values at the end of loading this
-%   package, but you may reset them if you don't like that.
-% \end{description}
-% \section{Provided Commands}
-% \DescribeEnv{preview} The |preview| environment causes its contents
-% to be set as a single preview image.  Insertions like figures and
-% footnotes (except those included in minipages) will typically lead
-% to error messages or be lost.  In case the |preview| package has not
-% been activated, the contents of this environment will be typeset
-% normally.
-% 
-% \DescribeEnv{nopreview} The |nopreview| environment will cause its
-% contents not to undergo any special treatment by the |preview|
-% package.  When |preview| is active, the contents will be discarded
-% like all main text that does not trigger the |preview| hooks.  When
-% |preview| is not active, the contents will be typeset just like the
-% main text.
-% 
-% Note that both of these environments typeset things as usual when
-% preview is not active.  If you need something typeset conditionally,
-% use the \cmd{\ifPreview} conditional for it.
-% 
-% \DescribeMacro{\PreviewMacro} If you want to make a macro like
-% \cmd{\includegraphics} (actually, this is what is done by the
-% |graphics| option to |preview|) produce a preview image, you put a
-% declaration like
-% \begin{quote}
-% |\PreviewMacro[*[[!]{\includegraphics}|
-% \end{quote}
-% or, more readable,
-% \begin{quote}
-% |\PreviewMacro[{*[][]{}}]{\includegraphics}|
-% \end{quote}
-% into your preamble.  The optional argument to \cmd{\PreviewMacro}
-% specifies the arguments \cmd{\includegraphics} accepts, since this
-% is necessary information for properly ending the preview box.  Note
-% that if you are using the more readable form, you have to enclose
-% the argument in a |[{| and |}]| pair.  The inner braces are
-% necessary to stop any included |[]| pairs from prematurely ending
-% the optional argument, and to make a single |{}|
-% denoting an optional argument not get stripped away by \TeX's
-% argument parsing.
-% 
-% The letters simply mean
-% \begin{description}
-% \item[|*|] indicates an optional |*| modifier, as in
-%   |\includegraphics*|.
-% \item[|[|]^^A]
-%   indicates an optional argument in brackets.  This syntax
-%   is somewhat baroque, but brief.
-% \item[{|[]|}] also indicates an optional argument in brackets.  Be
-%   sure to have encluded the entire optional argument specification
-%   in an additional pair of braces as described above.
-% \item[|!|] indicates a mandatory argument.
-% \item[|\char`{\char`}|] indicates the same.  Again, be sure to have
-%   that additional level of braces around the whole argument
-%   specification.
-% \item[|?|\meta{delimiter}\marg{true case}\marg{false case}] is a
-%   conditional.  The next character is checked against being equal to
-%   \meta{delimiter}.  If it is, the specification \meta{true case} is
-%   used for the further parsing, otherwise \meta{false case} will be
-%   employed.  In neither case is something consumed from the input,
-%   so \marg{true case} will still have to deal with the upcoming
-%   delimiter.
-% \item[|@|\marg{literal sequence}] will insert the given sequence
-%   literally into the executed call of the command.
-% \item[|-|] will just drop the next token.  It will probably be most
-%   often used in the true branch of a |?| specification.
-% \item[|\#|\marg{argument}\marg{replacement}] is a transformation
-%   rule that calls a macro with the given argument and replacement
-%   text on the rest of the argument list.  The replacement is used in
-%   the executed call of the command.  This can be used for parsing
-%   arbitrary constructs.  For example, the |[]| option could manually
-%   be implemented with the option string |?[{#{[#1]}{[{#1}]}}{}|.
-%   PStricks users might enjoy this sort of flexibility.
-% \item[|:|\marg{argument}\marg{replacement}] is again a
-%   transformation rule.  As opposed to |#|, however, the result of
-%   the transformation is parsed again.  You'll rarely need this.
-% \end{description}
-% 
-% There is a second optional argument in brackets that can be used to
-% declare any default action to be taken instead.  This is mostly for
-% the sake of macros that influence numbering: you would want to keep
-% their effects in that respect.  The default action should use |#1|
-% for referring to the original (not the patched) command with the
-% parsed options appended.  Not specifying a second optional argument
-% here is equivalent to specifying~|[#1]|.
-% 
-% \DescribeMacro{\PreviewMacro*} A similar invocation
-% \cmd{\PreviewMacro*} simply throws the macro and all of its
-% arguments declared in the manner above away.  This is mostly useful
-% for having things like \cmd{\footnote} not do their magic on their
-% arguments.  More often than not, you don't want to declare any
-% arguments to scan to \cmd{\PreviewMacro*} since you would want the
-% remaining arguments to be treated as usual text and typeset in that
-% manner instead of being thrown away.  An exception might be, say,
-% sort keys for \cmd{\cite}.
-% 
-% A second optional argument in brackets can be used to declare any
-% default action to be taken instead.  This is for the sake of macros
-% that influence numbering: you would want to keep their effects in
-% that respect.  The default action might use |#1| for referring to
-% the original (not the patched) command with the parsed options
-% appended.  Not specifying a second optional argument here is
-% equivalent to specifying~|[]| since the command usually gets thrown
-% away.
-% 
-% As an example for using this argument, you might want to specify
-% \begin{quote}
-%   |\PreviewMacro*\footnote[{[]}][#1{}]|
-% \end{quote}
-% This will replace a footnote by an empty footnote, but taking any
-% optional parameter into account, since an optional paramter changes
-% the numbering scheme.  That way the real argument for the footnote
-% remains for processing by \previewlatex.
-% 
-% \DescribeMacro{\PreviewEnvironment} The macro
-% \cmd{\PreviewEnvironment} works just as \cmd{\PreviewMacro} does,
-% only for environments.  \DescribeMacro{\PreviewEnvironment*} And the
-% same goes for \cmd{\PreviewEnvironment*} as compared to
-% \cmd{\PreviewMacro*}.
-% 
-% \DescribeMacro{\PreviewSnarfEnvironment} This macro does not typeset
-% the original environment inside of a preview box, but instead
-% typesets just the contents of the original environment inside of the
-% preview box, leaving nothing for the original environment.  This has
-% to be used for figures, for example, since they would
-% \begin{enumerate}
-% \item produce insertion material that cannot be extracted to the
-%   preview properly,
-% \item complain with an error message about not being in outer par
-%   mode.
-% \end{enumerate}
-% 
-% \DescribeMacro{\PreviewOpen}
-% \DescribeMacro{\PreviewClose}
-% Those Macros form a matched preview pair.  This is for macros that
-% behave similar as \cmd{\begin} and \cmd{\end} of an environment.  It
-% is essential for the operation of \cmd{\PreviewOpen} that the macro
-% treated with it will open an additional group even when the preview
-% falls inside of another preview or inside of a |nopreview|
-% environment.  Similarly, the macro treated with \cmd{PreviewClose}
-% will close an environment even when inactive.
-% 
-% \DescribeMacro{\ifPreview} In case you need to know whether
-% |preview| is active, you can use the conditional \cmd{\ifPreview}
-% together with |\else| and |\fi|.
-%
-% \StopEventually{}
-% \section{The Implementation}
-% Here we go: the start is somewhat obtuse since we figure out version
-% number and date from RCS strings.  This should really be done at
-% docstrip time instead.  Takers?
-% \begin{macro}{\pr@version}
-%    \begin{macrocode}
-%<*style>
-%<*!active>
-\NeedsTeXFormat{LaTeX2e} \def\reserved@a #1#2$#3:
-#4${\xdef#1{\reserved@c #2#4 $}} \def\reserved@c #1 #2${#1}
-\begingroup \catcode`\_=12
-\reserved@a\pr@version $Name: release_11_88 $ \ifx\pr@version\@empty
-\reserved@a\pr@version CVS-$Revision: 1.126 $ \endgroup \else
-  \def\next release_{} \lccode`\_=`.
-  \edef\next{\lowercase{\endgroup
-    \def\noexpand\pr@version{\expandafter\next\pr@version}}} \next \fi
-\reserved@a\next $Date: 2010/02/14 16:19:00 $
-\edef\next{\noexpand\ProvidesPackage{preview}%
-  [\next\space \pr@version\space (AUCTeX/preview-latex)]}
-\next
-%    \end{macrocode}
-% \end{macro}
-% Since many parts here will not be needed as long as the package is
-% inactive, we will include them enclosed with |<*active>| and
-% |</active>| guards.  That way, we can append all of this stuff at a
-% place where it does not get loaded if not necessary.
-%
-%\begin{macro}{\ifPreview}
-%  Setting the \cmd{\ifPreview} command should not be done by the
-%  user, so we don't use \cmd{\newif} here.  As a consequence, there
-%  are no \cmd{\Previewtrue} and \cmd{\Previewfalse} commands.
-%    \begin{macrocode}
-\let\ifPreview\iffalse
-%</!active>
-%    \end{macrocode}
-%\end{macro}
-%\begin{macro}{\ifpr@outer}
-%  We don't allow previews inside of previews.  The macro
-%  \cmd{\ifpr@outer} can be used for checking whether we are outside
-%  of any preview code.
-%    \begin{macrocode}
-%<*active>
-\newif\ifpr@outer
-\pr@outertrue
-%</active>
-%    \end{macrocode}
-%\end{macro}
-%
-%\begin{macro}{\preview@delay}
-%  The usual meaning of \cmd{\preview@delay} is to just echo its
-%  argument in normal |preview| operation.  If |preview| is inactive,
-%  it swallows its argument.  If the |delayed| option is active, the
-%  contents will be passed to the \cmd{\AtBeginDocument} hook.
-%\begin{macro}{\pr@advise}
-%  The core macro for modifying commands is \cmd{\pr@advise}.  You
-%  pass it the original command name as first argument and what should
-%  be executed before the saved original command as second argument.
-%\begin{macro}{\pr@advise@ship}
-%  The most often used macro for modifying commands is
-%  \cmd{\pr@advise@ship}.  It receives three arguments.  The first is
-%  the macro to modify, the second specifies some actions to be done
-%  inside of a box to be created before the original macro gets
-%  executed, the third one specifies actions after the original macro
-%  got executed.
-%\begin{macro}{\pr@loadcfg}
-%  The macro \cmd{\pr@loadcfg} is used for loading in configuration
-%  files, unless disabled by the |noconfig| option.
-%    \begin{macrocode}
-%<*!active>
-\let\preview@delay=\@gobble
-\let\pr@advise=\@gobbletwo
-\long\def\pr@advise@ship#1#2#3{}
-\def\pr@loadcfg#1{\InputIfFileExists{#1.cfg}{}{}}
-\DeclareOption{noconfig}{\let\pr@loadcfg=\@gobble}
-%    \end{macrocode}
-%\begin{macro}{\pr@addto@front}
-%  This adds code globally to the front of a macro.
-%    \begin{macrocode}
-\long\def\pr@addto@front#1#2{%
-  \toks@{#2}\toks@\expandafter{\the\expandafter\toks@#1}%
-  \xdef#1{\the\toks@}}
-%    \end{macrocode}
-% \end{macro}
-% These commands get more interesting when |preview| is active:
-%    \begin{macrocode}
-\DeclareOption{active}{%
-  \let\ifPreview\iftrue
-  \def\pr@advise#1{%
-    \expandafter\pr@adviseii\csname pr@\string#1\endcsname#1}%
-  \long\def\pr@advise@ship#1#2#3{\pr@advise#1{\pr@protect@ship{#2}{#3}}}%
-  \let\preview@delay\@firstofone}
-%    \end{macrocode}
-% \end{macro}
-% \end{macro}
-% \end{macro}
-% \end{macro}
-% 
-% \begin{macro}{\pr@adviseii}
-%   Now \cmd{\pr@advise} needs its helper macro.  In order to avoid
-%   recursive definitions, we advise only macros that are not yet
-%   advised.  Or, more exactly, we throw away the old advice and only
-%   take the new one.  We use e\TeX's \cmd{\protected} where available
-%   for some extra robustness.
-%    \begin{macrocode}
-\long\def\pr@adviseii#1#2#3{\preview@delay{%
-  \ifx#1\relax \let#1#2\fi
-  \toks@{#3#1}%
-  \ifx\@undefined\protected \else \protected\fi
-  \long\edef#2{\the\toks@}}}
-%    \end{macrocode}
-%\end{macro}
-%
-% The |delayed| option is easy to implement: this is \emph{not} done
-% with \cmd{\let} since at the course of document processing, \LaTeX\
-% redefines \cmd{\AtBeginDocument} and we want to follow that
-% redefinition.
-%    \begin{macrocode}
-\DeclareOption{delayed}{%
-  \ifPreview \def\preview@delay{\AtBeginDocument}\fi
-}
-%    \end{macrocode}
-%
-%\begin{macro}{\ifpr@fixbb}
-%  Another conditional.  \cmd{\ifpr@fixbb} tells us whether we want to
-%  surround the typeset materials with invisible rules so that Dvips
-%  gets the bounding boxes right for, say, pure PostScript inclusions.
-%
-%  If you are installing this on an operating system different from
-%  the one |preview| has been developed on, you might want to redefine
-%  |\pr@markerbox| in your |prdefault.cfg| file to use a file known to
-%  be empty, like |/dev/null| is under Unix.  Make this redefinition
-%  depend on \cmd{\ifpr@fixbb} since only then |\pr@markerbox| will be
-%  defined.
-%    \begin{macrocode}
-\newif\ifpr@fixbb
-\pr@fixbbfalse
-\DeclareOption{psfixbb}{\ifPreview%
-  \pr@fixbbtrue
-  \newbox\pr@markerbox
-  \setbox\pr@markerbox\hbox{\special{psfile=/dev/null}}\fi
-}
-%    \end{macrocode}
-% \end{macro}
-% \begin{macro}{\pr@graphicstype}
-%   The |dvips| option redefines the |bop-hook| to reset the page
-%   size.
-%    \begin{macrocode}
-\let\pr@graphicstype=\z@
-\DeclareOption{dvips}{%
-  \let\pr@graphicstype\@ne
-  \preview@delay{\AtBeginDvi{%
-      \special{!/preview@version(\pr@version)def}
-      \special{!userdict begin/preview-bop-level 0 def%
-      /bop-hook{/preview-bop-level dup load dup 0 le{/isls false def%
-          /vsize 792 def/hsize 612 def}if 1 add store}bind def%
-      /eop-hook{/preview-bop-level dup load dup 0 gt{1 sub}if
-        store}bind def end}}}}
-%    \end{macrocode}
-% The |pdftex| option just sets \cmd{\pr@graphicstype}.
-%    \begin{macrocode}
-\DeclareOption{pdftex}{%
-  \let\pr@graphicstype\tw@}
-%    \end{macrocode}
-% And so does the |xetex| option.
-%    \begin{macrocode}
-\DeclareOption{xetex}{%
-  \let\pr@graphicstype\thr@@}
-%</!active>
-%    \end{macrocode}
-% \end{macro}
-% \subsection{The internals}
-%
-% Those are only needed if |preview| is active.
-%    \begin{macrocode}
-%<*active>
-%    \end{macrocode}
-% \begin{macro}{\pr@snippet}
-%   \cmd{\pr@snippet} is the current snippet number.  We need a
-%   separate counter to \cmd{\c@page} since several other commands
-%   might fiddle with the page number.
-%    \begin{macrocode}
-\newcount\pr@snippet
-\global\pr@snippet=1
-%    \end{macrocode}
-% \end{macro}
-% \begin{macro}{\pr@protect}
-%   This macro gets one argument which is unpacked and executed in
-%   typesetting situations where we are not yet inside of a preview.
-%    \begin{macrocode}
-\def\pr@protect{\ifx\protect\@typeset@protect
-  \ifpr@outer \expandafter\expandafter\expandafter
-     \@secondoftwo\fi\fi\@gobble}
-%    \end{macrocode}
-% \end{macro}
-% \begin{macro}{\pr@protect@ship}
-%   Now for the above mentioned \cmd{\pr@protect@ship}.  This gets
-%   three arguments.  The first is what to do at the beginning of the
-%   preview, the second what to do at the end, the third is the macro
-%   where we stored the original definition.
-%
-%   In case we are not in a typesetting situation,
-%   \cmd{\pr@protect@ship} leaves the stored macro to fend for its
-%   own.  No better or worse protection than the original.  And we
-%   only do anything different when \cmd{\ifpr@outer} turns out to be
-%   true.
-%    \begin{macrocode}
-\def\pr@protect@ship{\pr@protect{\@firstoftwo\pr@startbox}%
-   \@gobbletwo}
-%    \end{macrocode}
-% \end{macro}
-% \begin{macro}{\pr@insert}
-% \begin{macro}{\pr@mark}
-% \begin{macro}{\pr@marks}
-%   We don't want insertions to end up on our lists.  So we disable
-%   them right now by replacing them with the following:
-%    \begin{macrocode}
-\def\pr@insert{\begingroup\afterassignment\pr@insertii\count@}
-\def\pr@insertii{\endgroup\setbox\pr@box\vbox}
-%    \end{macrocode}
-% Similar things hold for marks.
-%    \begin{macrocode}
-\def\pr@mark{{\afterassignment}\toks@}
-\def\pr@marks{{\aftergroup\pr@mark\afterassignment}\count@}
-%    \end{macrocode}
-% \end{macro}
-% \end{macro}
-% \end{macro}
-% \begin{macro}{\pr@box}
-% \begin{macro}{\pr@startbox}
-%   Previews will be stored in \cmd{\box}\cmd{\pr@box}.
-%   \cmd{\pr@startbox} gets two arguments: code to execute immediately
-%   before the following stuff, code to execute afterwards.  You have
-%   to cater for \cmd{\pr@endbox} being called at the right time
-%   yourself.  We will use a \cmd{\vsplit} on the box later in order
-%   to remove any leading glues, penalties and similar stuff.  For
-%   this reason we start off the box with an optimal break point.
-%    \begin{macrocode}
-\newbox\pr@box
-\long\def\pr@startbox#1#2{%
-  \ifpr@outer
-    \toks@{#2}%
-    \edef\pr@cleanup{\the\toks@}%
-    \setbox\pr@box\vbox\bgroup
-    \break
-    \pr@outerfalse\@arrayparboxrestore
-    \let\insert\pr@insert
-    \let\mark\pr@mark
-    \let\marks\pr@marks
-    \expandafter\expandafter\expandafter
-    \pr@ship@start
-    \expandafter\@firstofone
-  \else
-     \expandafter \@gobble
-  \fi{#1}}
-%    \end{macrocode}
-% \end{macro}
-% \end{macro}
-% \begin{macro}{\pr@endbox}
-%   Cleaning up also is straightforward.  If we have to watch the
-%   bounding \TeX\ box, we want to remove spurious skips.  We also
-%   want to unwrap a possible single line paragraph, so that the box
-%   is not full line length.  We use \cmd{\vsplit} to clean up leading
-%   glue and stuff, and we make some attempt of removing trailing
-%   ones.  After that, we wrap up the box including possible material
-%   from \cmd{\AtBeginDvi}.  If the |psfixbb| option is active, we
-%   adorn the upper left and lower right corners with copies of
-%   \cmd{\pr@markerbox}.  The first few lines cater for \LaTeX\ hiding
-%   things like like the code for \cmd{\paragraph} in \cmd{\everypar}.
-%    \begin{macrocode}
-\def\pr@endbox{%
-   \let\reserved@a\relax
-   \ifvmode \edef\reserved@a{\the\everypar}%
-      \ifx\reserved@a\@empty\else
-            \dimen@\prevdepth
-            \noindent\par
-            \setbox\z@\lastbox\unskip\unpenalty
-            \prevdepth\dimen@
-            \setbox\z@\hbox\bgroup\penalty-\maxdimen\unhbox\z@
-              \ifnum\lastpenalty=-\maxdimen\egroup
-              \else\egroup\box\z@ \fi\fi\fi
-   \ifhmode \par\unskip\setbox\z@\lastbox
-     \nointerlineskip\hbox{\unhbox\z@\/}%
-   \else \unskip\unpenalty\unskip \fi
-   \egroup
-   \setbox\pr@box\vbox{%
-       \baselineskip\z@skip \lineskip\z@skip \lineskiplimit\z@
-       \@begindvi
-       \nointerlineskip
-       \splittopskip\z@skip\setbox\z@\vsplit\pr@box to\z@
-       \unvbox\z@
-       \nointerlineskip
-       %\color@setgroup
-       \box\pr@box
-       %\color@endgroup
-     }%
-%    \end{macrocode}
-% \begin{macro}{\pr@ship@end}
-%   \label{sec:prshipend}At this point, \cmd{\pr@ship@end} gets
-%   called.  You must not under any circumstances change |\box\pr@box|
-%   in any way that would add typeset material at the front of it,
-%   except for PostScript header specials, since the front of
-%   |\box\pr@box| may contain stuff from \cmd{\AtBeginDvi}.
-%   \cmd{\pr@ship@end} contains two types of code additions: stuff
-%   that adds to |\box\pr@box|, like the |labels| option does, and
-%   stuff that measures out things or otherwise takes a look at the
-%   finished |\box\pr@box|, like the |auctex| or |showbox| option do.
-%   The former should use \cmd{pr@addto@front} for adding to this
-%   hook, the latter use \cmd{g@addto@macro} for adding at the end of
-%   this hook.
-%
-%   Note that we shift the output box up by its height via
-%   \cmd{\voffset}.  This has three reasons: first we make sure that
-%   no package-inflicted non-zero value of \cmd{\voffset} or
-%   \cmd{\hoffset} will have any influence on the positioning of our
-%   box.  Second we shift the box such that its basepoint will exactly
-%   be at the (1in,1in)~mark defined by \TeX.  That way we can
-%   properly take ascenders into account.  And the third reason is
-%   that \TeX\ treats a \cmd{\hbox} and a \cmd{\vbox} differently with
-%   regard to the treating of its depth.  Shifting \cmd{\voffset} and
-%   \cmd{\hoffset} can be inhibited by setting |\pr@offset@override|.
-%    \begin{macrocode}
-   \pr@ship@end
-   {\let\protect\noexpand
-   \ifx\pr@offset@override\@undefined
-     \voffset=-\ht\pr@box
-     \hoffset=\z@
-   \fi
-   \c@page=\pr@snippet
-   \pr@shipout
-   \ifpr@fixbb\hbox{%
-     \dimen@\wd\pr@box
-     \@tempdima\ht\pr@box
-     \@tempdimb\dp\pr@box
-     \box\pr@box
-     \llap{\raise\@tempdima\copy\pr@markerbox\kern\dimen@}%
-     \lower\@tempdimb\copy\pr@markerbox}%
-   \else \box\pr@box \fi}%
-   \global\advance\pr@snippet\@ne
-   \pr@cleanup
-}
-%    \end{macrocode}
-% \end{macro}
-% \end{macro}
-% Oh, and we kill off the usual meaning of \cmd{\shipout} in case
-% somebody makes a special output routine.  The following test is
-% pretty much the same as in |everyshi.sty|.  One of its implications
-% is that if someone does a \cmd{\shipout} of a \emph{void} box,
-% things will go horribly wrong.
-% \begin{macro}{\shipout}
-%    \begin{macrocode}
-\let\pr@shipout=\shipout
-\def\shipout{\deadcycles\z@\bgroup\setbox\z@\box\voidb@x
-  \afterassignment\pr@shipoutegroup\setbox\z@}
-\def\pr@shipoutegroup{\ifvoid\z@ \expandafter\aftergroup\fi \egroup}
-%    \end{macrocode}
-% \end{macro}
-% \subsection{Parsing commands}
-% \begin{macro}{\pr@parseit}
-% \begin{macro}{\pr@endparse}
-% \begin{macro}{\pr@callafter}
-%   The following stuff is for parsing the arguments of commands we
-%   want to somehow surround with stuff.  Usage is
-%   \begin{quote}
-%     \cmd{\pr@callafter}\meta{aftertoken}\meta{parsestring}\cmd{\pr@endparse}\\
-%     \qquad\meta{macro}\meta{parameters}
-%   \end{quote}
-%   \meta{aftertoken} is stored away and gets executed once parsing
-%   completes, with its first argument being the parsed material.
-%   \meta{parsestring} would be, for example for the
-%   \cmd{\includegraphics} macro, |*[[!|, an optional |*| argument
-%   followed by two optional arguments enclosed in |[]|, followed by
-%   one mandatory argument.
-%
-%   For the sake of a somewhat more intuitive syntax, we now support
-%   also the syntax |{*[]{}}| in the optional argument.  Since \TeX\
-%   strips redundant braces, we have to write |[{{}}]| in this syntax
-%   for a single mandatory argument.  Hard to avoid.  We use an
-%   unusual character for ending the parsing.  The implementation is
-%   rather trivial.
-%    \begin{macrocode}
-\def\pr@parseit#1{\csname pr@parse#1\endcsname}
-\let\pr@endparse=\@percentchar
-\def\next#1{%
-\def\pr@callafter{%
-  \afterassignment\pr@parseit
-  \let#1= }}
-\expandafter\next\csname pr@parse\pr@endparse\endcsname
-%    \end{macrocode}
-% \end{macro}
-% \end{macro}
-% \end{macro}
-% \begin{macro}{\pr@parse*}
-%   Straightforward, same mechanism \LaTeX\ itself employs.  We take
-%   some care not to pass potential |#| tokens unprotected through
-%   macros.
-%    \begin{macrocode}
-\long\expandafter\def\csname pr@parse*\endcsname#1\pr@endparse#2{%
-  \begingroup\toks@{#1\pr@endparse{#2}}%
-  \edef\next##1{\endgroup##1\the\toks@}%
-  \@ifstar{\next{\pr@parse@*}}{\next\pr@parseit}}
-%    \end{macrocode}
-% \end{macro}
-% \begin{macro}{\pr@parse[}
-% \begin{macro}{\pr@brace}
-%   Copies optional parameters in brackets if present.  The additional
-%   level of braces is necessary to ensure that braces the user might
-%   have put to hide a~|]| bracket in an optional argument don't get
-%   lost.  There will be no harm if such braces were not there at the
-%   start.
-%    \begin{macrocode}
-\long\expandafter\def\csname pr@parse[\endcsname#1\pr@endparse#2{%
-  \begingroup\toks@{#1\pr@endparse{#2}}%
-  \edef\next##1{\endgroup##1\the\toks@}%
-  \@ifnextchar[{\next\pr@bracket}{\next\pr@parseit}}
-\long\def\pr@bracket#1\pr@endparse#2[#3]{%
-   \pr@parseit#1\pr@endparse{#2[{#3}]}}
-%    \end{macrocode}
-% \end{macro}
-% \end{macro}
-% \begin{macro}{\pr@parse]}
-%   This is basically a do-nothing, so that we may use the syntax
-%   |{*[][]!}| in the optional argument instead of the more concise
-%   but ugly |*[[!| which confuses the brace matchers of editors.
-%    \begin{macrocode}
-\expandafter\let\csname pr@parse]\endcsname=\pr@parseit
-%    \end{macrocode}
-% \end{macro}
-% \begin{macro}{\pr@parse}
-% \begin{macro}{\pr@parse!}
-%   Mandatory arguments are perhaps easiest to parse.
-%    \begin{macrocode}
-\long\def\pr@parse#1\pr@endparse#2#3{%
-  \pr@parseit#1\pr@endparse{#2{#3}}}
-\expandafter\let\csname pr@parse!\endcsname=\pr@parse
-%    \end{macrocode}
-% \end{macro}
-% \end{macro}
-% \begin{macro}{\pr@parse?}
-% \begin{macro}{\pr@parsecond}
-%   This does an explicit call of |\@ifnextchar| and forks into the
-%   given two alternatives as a result.
-%    \begin{macrocode}
-\long\expandafter\def\csname pr@parse?\endcsname#1#2\pr@endparse#3{%
-  \begingroup\toks@{#2\pr@endparse{#3}}%
-  \@ifnextchar#1{\pr@parsecond\@firstoftwo}%
-                {\pr@parsecond\@secondoftwo}}
-\def\pr@parsecond#1{\expandafter\endgroup
-  \expandafter\expandafter\expandafter\pr@parseit
-  \expandafter#1\the\toks@}
-%    \end{macrocode}
-% \end{macro}
-% \end{macro}
-% \begin{macro}{\pr@parse@}
-%   This makes it possible to insert literal material into the
-%   argument list.
-%    \begin{macrocode}
- \long\def\pr@parse@#1#2\pr@endparse#3{%
-   \pr@parseit #2\pr@endparse{#3#1}}
-%    \end{macrocode}
-% \end{macro}
-% \begin{macro}{\pr@parse-}
-%   This will just drop the next token.
-%    \begin{macrocode}
-\long\expandafter\def\csname pr@parse-\endcsname
-  #1\pr@endparse#2{\begingroup
-  \toks@{\endgroup\pr@parseit #1\pr@endparse{#2}}%
-  {\aftergroup\the\aftergroup\toks@ \afterassignment}%
-  \let\next= }
-%    \end{macrocode}
-% \end{macro}
-% \begin{macro}{\pr@parse:}
-%   The following is a transform rule.  A macro is being defined with
-%   the given argument list and replacement, and the transformed
-%   version replaces the original.  The result of the transform is
-%   still subject to being parsed.
-%    \begin{macrocode}
-\long\expandafter\def\csname pr@parse:\endcsname
-  #1#2#3\pr@endparse#4{\begingroup
-    \toks@{\endgroup \pr@parseit#3\pr@endparse{#4}}%
-    \long\def\next#1{#2}%
-    \the\expandafter\toks@\next}
-%    \end{macrocode}
-% \end{macro}
-% \edef\next{\noexpand\begin{macro}{\noexpand
-%    \pr@parse\string#}}
-% \next
-%   Another transform rule, but this passes the transformed material
-%   into the token list.
-%    \begin{macrocode}
-\long\expandafter\def\csname pr@parse#\endcsname
-  #1#2#3\pr@endparse#4{\begingroup
-    \toks@{#4}%
-    \long\edef\next##1{\toks@{\the\toks@##1}}%
-    \toks@{\endgroup \pr@parseit#3\pr@endparse}%
-    \long\def\reserved@a#1{{#2}}%
-    \the\expandafter\next\reserved@a}
-%</active>
-%    \end{macrocode}
-% \end{macro}
-%
-% \subsection{Selection options}
-% The |displaymath| option.  The |equation| environments in AMS\LaTeX\
-% already do too much before our hook gets to interfere, so we hook
-% earlier.  Some juggling is involved to ensure we get the original
-% |\everydisplay| tokens only once and where appropriate.
-%
-% The incredible hack with |\dt@ptrue| is necessary for working around
-% bug `amslatex/3425'.
-%    \begin{macrocode}
-%<*!active>
-\begingroup
-\catcode`\*=11
-\@firstofone{\endgroup
-\DeclareOption{displaymath}{%
-  \preview@delay{\toks@{%
-      \pr@startbox{\noindent$$%
-        \aftergroup\pr@endbox\@gobbletwo}{$$}\@firstofone}%
-    \everydisplay\expandafter{\the\expandafter\toks@
-      \expandafter{\the\everydisplay}}}%
-  \pr@advise@ship\equation{\begingroup\aftergroup\pr@endbox
-    \def\dt@ptrue{\m@ne=\m@ne}\noindent}%
-    {\endgroup}%
-  \pr@advise@ship\equation*{\begingroup\aftergroup\pr@endbox
-    \def\dt@ptrue{\m@ne=\m@ne}\noindent}%
-    {\endgroup}%
-  \PreviewOpen[][\def\dt@ptrue{\m@ne=\m@ne}\noindent#1]\[%
-  \PreviewClose\]%
-  \PreviewEnvironment[][\noindent#1]{eqnarray}%
-  \PreviewEnvironment[][\noindent#1]{eqnarray*}%
-  \PreviewEnvironment{displaymath}%
-}}
-%    \end{macrocode}
-%
-% The |textmath| option.  Some folderol in order to define the active
-% |$|
-% math mode delimiter.  \cmd\pr@textmathcheck is used for checking
-% whether we have a single |$| or double |$$|.
-% In the latter case, we enter display math (this sort of display math
-% is not allowed inside of \LaTeX\ because of inconsistent spacing,
-% but surprisingly many people use it nevertheless).  Strictly
-% speaking, this is incorrect, since not every
-% |$$| actually means display math.  For example, |\hbox{$$}| will
-% because of restricted horizontal mode rather yield an empty text
-% math formula.  Since our implementation moved the sequence inside of
-% a |\vbox|, the interpretation will change.  People should just not
-% enter rubbish like that.
-%    \begin{macrocode}
-\begingroup
-\def\next#1#2{%
-  \endgroup
-  \DeclareOption{textmath}{%
-    \PreviewEnvironment{math}%
-    \preview@delay{\ifx#1\@undefined \let#1=$%$
-      \fi\catcode`\$=\active
-      \ifx\xyreuncatcodes\@undefined\else
-        \edef\next{\catcode`@=\the\catcode`@\relax}%
-        \makeatother\expandafter\xyreuncatcodes\next\fi}%
-    \pr@advise@ship\(\pr@endaftergroup{}% \)
-    \pr@advise@ship#1{\@firstoftwo{\let#1=#2%
-        \futurelet\reserved@a\pr@textmathcheck}}{}}%
-  \def\pr@textmathcheck{\expandafter\pr@endaftergroup
-    \ifx\reserved@a#1{#2#2}\expandafter\@gobbletwo\fi#2}}
-\lccode`\~=`\$
-\lowercase{\expandafter\next\expandafter~}%
-  \csname pr@\string$%$
-  \endcsname
-%</!active>
-%    \end{macrocode}
-% \begin{macro}{\pr@endaftergroup}
-%   This justs ends the box after the group opened by |#1| is closed
-%   again.
-%    \begin{macrocode}
-%<*active>
-\def\pr@endaftergroup#1{#1\aftergroup\pr@endbox}
-%</active>
-%    \end{macrocode}
-% \end{macro}
-%
-% The |graphics| option.
-%    \begin{macrocode}
-%<*!active>
-\DeclareOption{graphics}{%
-  \PreviewMacro[*[[!]{\includegraphics}%]]
-}
-%    \end{macrocode}
-% The |floats| option.  The complications here are merely to spare us
-% bug reports about broken document classes that use |\let| on
-% |\endfigure| and similar.  Notable culprits that have not been
-% changed in years in spite of reports are |elsart.cls| and
-% |IEEEtran.cls|.  Complain when you are concerned.
-%    \begin{macrocode}
-\def\pr@floatfix#1#2{\ifx#1#2%
-  \ifx#1\@undefined\else
-  \PackageWarningNoLine{preview}{%
-Your document class has a bad definition^^J
-of \string#1, most likely^^J
-\string\let\string#1=\string#2^^J
-which has now been changed to^^J
-\string\def\string#1{\string#2}^^J
-because otherwise subsequent changes to \string#2^^J
-(like done by several packages changing float behaviour)^^J
-can't take effect on \string#1.^^J
-Please complain to your document class author}%
-  \def#1{#2}\fi\fi}
-\begingroup
-\def\next#1#2{\endgroup
-  \DeclareOption{floats}{%
-    \pr@floatfix\endfigure\end@float
-    \pr@floatfix\endtable\end@float
-    \pr@floatfix#1\end@dblfloat
-    \pr@floatfix#2\end@dblfloat
-    \PreviewSnarfEnvironment[![]{@float}%]
-    \PreviewSnarfEnvironment[![]{@dblfloat}%]
-  }}
-\expandafter\next\csname endfigure*\expandafter\endcsname
-  \csname endtable*\endcsname
-%    \end{macrocode}
-%  The |sections| option.  Two optional parameters might occur in
-%  |memoir.cls|.
-%    \begin{macrocode}
-\DeclareOption{sections}{%
-  \PreviewMacro[!!!!!!*[[!]{\@startsection}%]]
-  \PreviewMacro[*[[!]{\chapter}%]]
-}
-%    \end{macrocode}
-% We now interpret any further options as driver files we load.  Note
-% that these driver files are loaded even when |preview| is not
-% active.  The reason is that they might define commands (like
-% \cmd{\PreviewCommand}) that should be available even in case of an
-% inactive package.  Large parts of the |preview| package will not
-% have been loaded in this case: you have to cater for that.
-%    \begin{macrocode}
-\DeclareOption*
-   {\InputIfFileExists{pr\CurrentOption.def}{}{\OptionNotUsed}}
-%    \end{macrocode}
-%
-% \subsection{Preview attaching commands}
-% \begin{macro}{\PreviewMacro}
-%   As explained above. Detect possible |*| and call appropriate
-%   macro.
-%    \begin{macrocode}
-\def\PreviewMacro{\@ifstar\pr@starmacro\pr@macro}
-%    \end{macrocode}
-% The version without |*| is now rather straightforward.
-% \begin{macro}{\pr@macro}
-% \begin{macro}{\pr@domacro}
-% \begin{macro}{\pr@macroii}
-% \begin{macro}{\pr@endmacro}
-%    \begin{macrocode}
-\long\def\pr@domacro#1#2{%
-   \long\def\next##1{#2}%
-   \pr@callafter\next#1]\pr@endparse}
-\newcommand\pr@macro[1][]{%
-   \toks@{\pr@domacro{#1}}%
-   \long\edef\next[##1]##2{%
-    \noexpand\pr@advise@ship{##2}{\the\toks@{##1\noexpand\pr@endbox}}{}}%
-   \@ifnextchar[\next\pr@macroii}
-\def\pr@macroii{\next[##1]}
-\long\def\pr@endmacro#1{#1\pr@endbox}
-%    \end{macrocode}
-% \end{macro}
-% \end{macro}
-% \end{macro}
-% \end{macro}
-% \end{macro}
-% \begin{macro}{PreviewMacro*}
-% \begin{macro}{\pr@protect@domacro}
-% \begin{macro}{\pr@starmacro}
-%   The version with |*| has to parse the arguments, then throw them
-%   away.  Some internal macros first, then the interface call.
-%    \begin{macrocode}
-\long\def\pr@protect@domacro#1#2{\pr@protect{%
-    \long\def\next##1{#2}%
-    \pr@callafter\next#1]\pr@endparse}}
-\newcommand\pr@starmacro[1][]{\toks@{\pr@protect@domacro{#1}}%
-    \long\edef\next[##1]##2{%
-      \noexpand\pr@advise##2{\the\toks@{##1}}}%
-    \@ifnextchar[\next{\next[]}}
-%    \end{macrocode}
-% \end{macro}
-% \end{macro}
-% \end{macro}
-% \begin{macro}{\PreviewOpen}
-%   As explained above. Detect possible |*| and call appropriate macro.
-%    \begin{macrocode}
-\def\PreviewOpen{\@ifstar\pr@starmacro\pr@open}
-%    \end{macrocode}
-% The version without |*| is now rather straightforward.
-% \begin{macro}{\pr@open}
-%    \begin{macrocode}
-\newcommand\pr@open[1][]{%
-   \toks@{\pr@domacro{#1}}%
-   \long\edef\next[##1]##2{%
-     \noexpand\pr@advise##2{\begingroup
-     \noexpand\pr@protect@ship
-        {\the\toks@{\begingroup\aftergroup\noexpand\pr@endbox##1}}%
-        {\endgroup}}}%
-   \@ifnextchar[\next\pr@macroii}
-%    \end{macrocode}
-% \end{macro}
-% \end{macro}
-% \begin{macro}{\PreviewClose}
-%   As explained above. Detect possible |*| and call appropriate
-%   macro.
-%    \begin{macrocode}
-\def\PreviewClose{\@ifstar\pr@starmacro\pr@close}
-%    \end{macrocode}
-% The version without |*| is now rather straightforward.
-% \begin{macro}{\pr@close}
-%    \begin{macrocode}
-\newcommand\pr@close[1][]{%
-  \toks@{\pr@domacro{#1}}%
-  \long\edef\next[##1]##2{%
-   \noexpand\pr@advise{##2}{\the\toks@{##1\endgroup}}}%
-   \@ifnextchar[\next\pr@macroii}
-%    \end{macrocode}
-% \end{macro}
-% \end{macro}
-% \begin{macro}{\PreviewEnvironment}
-%   Actually, this ignores any syntax argument.  But don't tell
-%   anybody.  Except for the |*|~variant, it respects (actually
-%   ignores) any argument!  Of course, we'll need to deactivate
-%   |\end{|\meta{environment}|}| as well.
-%    \begin{macrocode}
-\def\PreviewEnvironment{\@ifstar\pr@starenv\pr@env}
-\newcommand\pr@starenv[1][]{\toks@{\pr@starmacro[{#1}]}%
-  \long\edef\next##1##2{%
-    \the\toks@[{##2}]##1}%
-  \begingroup\pr@starenvii}
-\newcommand\pr@starenvii[2][]{\endgroup
-  \expandafter\next\csname#2\endcsname{#1}%
-  \expandafter\pr@starmacro\csname end#2\endcsname}
-\newcommand\pr@env[1][]{%
-   \toks@{\pr@domacro{#1}}%
-   \long\edef\next[##1]##2{%
-   \noexpand\expandafter\noexpand\pr@advise@ship
-     \noexpand\csname##2\noexpand\endcsname{\the\toks@
-      {\begingroup\aftergroup\noexpand\pr@endbox##1}}{\endgroup}}%
-   \@ifnextchar[\next\pr@macroii %]
- }
-%    \end{macrocode}
-% \end{macro}
-% \begin{macro}{\PreviewSnarfEnvironment}
-%   This is a nuisance since we have to advise \emph{both} the
-%   environment and its end.
-%    \begin{macrocode}
-\newcommand{\PreviewSnarfEnvironment}[2][]{%
-  \expandafter\pr@advise
-   \csname #2\endcsname{\pr@snarfafter{#1}}%
- \expandafter\pr@advise
-   \csname end#2\endcsname{\pr@endsnarf}}
-%</!active>
-%    \end{macrocode}
-% \end{macro}
-% \begin{macro}{\pr@snarfafter}
-% \begin{macro}{\pr@startsnarf}
-% \begin{macro}{\pr@endsnarf}
-%   Ok, this looks complicated, but we have to start a group in order
-%   to be able to hook \cmd{\pr@endbox} into the game only when
-%   \cmd{\ifpr@outer} has triggered the start.  And we need to get our
-%   start messages out before parsing the arguments.
-%    \begin{macrocode}
-%<*active>
-\let\pr@endsnarf\relax
-\long\def\pr@snarfafter#1{\ifpr@outer
-     \pr@ship@start
-     \let\pr@ship@start\relax
-     \let\pr@endsnarf\endgroup
-   \else
-     \let\pr@endsnarf\relax
-   \fi
-  \pr@protect{\pr@callafter\pr@startsnarf#1]\pr@endparse}}
-\def\pr@startsnarf#1{#1\begingroup
-   \pr@startbox{\begingroup\aftergroup\pr@endbox}{\endgroup}%
-   \ignorespaces}
-%</active>
-%    \end{macrocode}
-% \end{macro}
-% \end{macro}
-% \end{macro}
-% \begin{macro}{\pr@ship@start}
-% \begin{macro}{\pr@ship@end}
-%   The hooks \cmd{\pr@ship@start} and \cmd{\pr@ship@end} can be added
-%   to by option files by the help of the \cmd{\g@addto@macro} command
-%   from \LaTeX, and by the \cmd{\pr@addto@front} command from
-%   |preview.sty| itself.  They are called just before starting to
-%   process some preview, and just after it.  Here is the policy for
-%   adding to them: \cmd{\pr@ship@start} is called inside of the vbox
-%   |\pr@box| before typeset material gets produced.  It is, however,
-%   preceded by a break command that is intended for usage in
-%   \cmd{\vsplit}, so that any following glue might disappear.  In
-%   case you want to add any material on the list, you have to precede
-%   it with \cmd{\unpenalty} and have to follow it with \cmd{\break}.
-%   You have make sure that under no circumstances any other legal
-%   breakpoints appear before that, and your material should
-%   contribute no nonzero dimensions to the page.  For the policies of
-%   the \cmd{\pr@ship@end} hook, see the description on
-%   page~\pageref{sec:prshipend}.
-%    \begin{macrocode}
-%<*!active>
-\let\pr@ship@start\@empty
-\let\pr@ship@end\@empty
-%    \end{macrocode}
-% \end{macro}
-% \end{macro}
-% \begin{environment}{preview}
-% \begin{environment}{nopreview}
-%   First we write the definitions of these environments when
-%   |preview| is inactive.  We will redefine them if |preview| gets
-%   activated.
-%    \begin{macrocode}
-\newenvironment{preview}{\ignorespaces}{\ifhmode\unskip\fi}
-\newenvironment{nopreview}{\ignorespaces}{\ifhmode\unskip\fi}
-%    \end{macrocode}
-% \end{environment}
-% \end{environment}
-%
-% We now process the options and finish in case we are not active.
-%    \begin{macrocode}
-\ProcessOptions\relax
-\ifPreview\else\expandafter\endinput\fi
-%</!active>
-%    \end{macrocode}
-% Now for the redefinition of the |preview| and |endpreview|
-% environments:
-%    \begin{macrocode}
-%<*active>
-\renewenvironment{preview}{\begingroup
-   \pr@startbox{\begingroup\aftergroup\pr@endbox}%
-               {\endgroup}%
-   \ignorespaces}%
-   {\ifhmode\unskip\fi\endgroup}
-\renewenvironment{nopreview}{\pr@outerfalse\ignorespaces}%
-  {\ifhmode\unskip\fi}
-%    \end{macrocode}
-% We use the normal output routine, but hijack it a bit for our
-% purposes to preserve \cmd{\AtBeginDvi} hooks and not get previews
-% while in output: that could become rather ugly.
-%
-% The main work of disabling normal output relies on a \cmd{\shipout}
-% redefinition.
-% \begin{macro}{\pr@output}
-%    \begin{macrocode}
-\newtoks\pr@output
-\pr@output\output
-\output{%
-  \pr@outerfalse
-  \let\@begindvi\@empty
-  \the\pr@output}
-\let\output\pr@output
-%    \end{macrocode}
-% \end{macro}
-% \begin{macro}{\pr@typeinfos}
-%   Then we have some document info that style files might want to
-%   output.
-%    \begin{macrocode}
-\def\pr@typeinfos{\typeout{Preview: Fontsize \f@size pt}%
-  \ifnum\mag=\@m\else\typeout{Preview: Magnification \number\mag}\fi
-  \ifx\pdfoutput\@undefined
-    \ifx\XeTeXversion\@undefined \else
-      % FIXME: The message should not be emitted if XeTeX does not produce
-      % PDF.  There does not seem to be a primitive for that, though.
-      \typeout{Preview: PDFoutput 1}%
-    \fi
-  \else
-    \ifx\pdfoutput\relax \else
-      \ifnum\pdfoutput>\z@
-        \typeout{Preview: PDFoutput 1}%
-      \fi
-    \fi
-  \fi
-}
-\AtBeginDocument{\pr@typeinfos}
-%    \end{macrocode}
-% \end{macro}
-% And at the end we load the default configuration file, so that it
-% may override settings from this package:
-%    \begin{macrocode}
-\pr@loadcfg{prdefault}
-%</active>
-%</style>
-%    \end{macrocode}
-%
-% \section{The option files}
-% \subsection{The \texttt{auctex} option}
-% The AUC\TeX\ option will cause error messages to spew.  We want them
-% on the terminal, but we don't want \LaTeX\ to stop its automated
-% run.  We delay \cmd{\nonstopmode} in case the user has any
-% pseudo-interactive folderol like reading in of file names in his
-% preamble.  Because we are so good-hearted, we will not break this as
-% long as the document has not started, but after that we need the
-% error message mechanism operative.
-%
-% The |\nofiles| command here tries to avoid clobbering input files
-% used for references and similar.  It will come too late if you call
-% the package with \cmd{\AtBeginDocument}, so you'll need to issue
-% |\nofiles| yourself in that case.  Previously, this was done
-% unconditionally in the main style file, but since we don't know what
-% the package may be used for, this was inappropriate.
-%
-% So here is the contents of the |prauctex.def| file:
-%    \begin{macrocode}
-%<auctex>\ifPreview\else\expandafter\endinput\fi
-%<auctex>\nofiles
-%<auctex>\preview@delay{\nonstopmode}
-%    \end{macrocode}
-% Ok, here comes creative error message formatting.  It turns out a
-% sizable portion of the runtime is spent in I/O.  Making the error
-% messages short is an advantage.  It is not possible to convince
-% \TeX\ to make shorter error messages than this: \TeX\ always wants
-% to include context.  This is about the shortest \ae sthetic one we
-% can muster.
-%    \begin{macrocode}
-%<auctex>\begingroup
-%<auctex>\lccode`\~=`\-
-%<auctex>\lccode`\{=`\<
-%<auctex>\lccode`\}=`\>
-%<auctex>\lowercase{\endgroup
-%<auctex>  \def\pr@msgi{{~}}}
-%<auctex>\def\pr@msgii{Preview:
-%<auctex>   Snippet \number\pr@snippet\space}
-%<auctex>\begingroup
-%<auctex>\catcode`\-=13
-%<auctex>\catcode`\<=13
-%<auctex>\@firstofone{\endgroup
-%<auctex>\def\pr@msg#1{{%
-%<auctex>   \let<\pr@msgi
-%<auctex>   \def-{\pr@msgii#1}%
-%<auctex>   \errhelp{Not a real error.}%
-%<auctex>   \errmessage<}}}
-%<auctex>\g@addto@macro\pr@ship@start{\pr@msg{started}}
-%<auctex>\g@addto@macro\pr@ship@end{\pr@msg{ended.%
-%<auctex>  (\number\ht\pr@box+\number\dp\pr@box x\number\wd\pr@box)}}
-%    \end{macrocode}
-% This looks pretty baffling, but it produces something short and
-% semi-graphical, namely |<-><->|.  That is a macro |<| that expands
-% into |<->|, where |<| and |>| are the braces around an
-% \cmd{\errmessage} argument and |-| is a macro expanding to the full
-% text of the error message.  Cough cough.  You did not really want to
-% know, did you?
-%
-% Since over/underfull boxes are about the messiest things to parse,
-% we disable them by setting the appropriate badness limits and making
-% the variables point to junk.  We also disable other stuff.  While we
-% set \cmd{\showboxbreadth} and \cmd{\showboxdepth} to indicate as
-% little diagnostic output as possible, we keep them operative, so
-% that the user retains the option of debugging using this stuff.  The
-% other variables concerning the generation of warnings and
-% daignostics, however, are more often set by commonly employed
-% packages and macros such as \cmd{\sloppy}.  So we kill them off for
-% good.
-%    \begin{macrocode}
-%<auctex>\hbadness=\maxdimen
-%<auctex>\newcount\hbadness
-%<auctex>\vbadness=\maxdimen
-%<auctex>\let\vbadness=\hbadness
-%<auctex>\hfuzz=\maxdimen
-%<auctex>\newdimen\hfuzz
-%<auctex>\vfuzz=\maxdimen
-%<auctex>\let\vfuzz=\hfuzz
-%<auctex>\showboxdepth=-1
-%<auctex>\showboxbreadth=-1
-%    \end{macrocode}
-% Ok, now we load a possible configuration file.
-%    \begin{macrocode}
-%<auctex>\pr@loadcfg{prauctex}
-%    \end{macrocode}
-% And here we cater for several frequently used commands in
-% |prauctex.cfg|:
-%    \begin{macrocode}
-%<auccfg>\PreviewMacro*[[][#1{}]\footnote
-%<auccfg>\PreviewMacro*[?[{@{[]}}{}][#1]\item
-%<auccfg>\PreviewMacro*\emph
-%<auccfg>\PreviewMacro*\textrm
-%<auccfg>\PreviewMacro*\textit
-%<auccfg>\PreviewMacro*\textsc
-%<auccfg>\PreviewMacro*\textsf
-%<auccfg>\PreviewMacro*\textsl
-%<auccfg>\PreviewMacro*\texttt
-%<auccfg>\PreviewMacro*\textcolor
-%<auccfg>\PreviewMacro*\mbox
-%<auccfg>\PreviewMacro*[][#1{}]\author
-%<auccfg>\PreviewMacro*[][#1{}]\title
-%<auccfg>\PreviewMacro*\and
-%<auccfg>\PreviewMacro*\thanks
-%<auccfg>\PreviewMacro*[][#1{}]\caption
-%<auccfg>\preview@delay{\@ifundefined{pr@\string\@startsection}{%
-%<auccfg>  \PreviewMacro*[!!!!!!*][#1{}]\@startsection}{}}
-%<auccfg>\preview@delay{\@ifundefined{pr@\string\chapter}{%
-%<auccfg>  \PreviewMacro*[*][#1{}]\chapter}{}}
-%<auccfg>\PreviewMacro*\index
-%    \end{macrocode}
-%
-% \subsection{The \texttt{lyx} option}
-% The following is the option providing LyX with info for its preview
-% implementation.
-%    \begin{macrocode}
-%<lyx>\ifPreview\else\expandafter\endinput\fi
-%<lyx>\pr@loadcfg{prlyx}
-%<lyx>\g@addto@macro\pr@ship@end{\typeout{Preview:
-%<lyx>  Snippet \number\pr@snippet\space
-%<lyx>  \number\ht\pr@box\space \number\dp\pr@box \space\number\wd\pr@box}}
-%    \end{macrocode}
-%
-% \subsection{The \texttt{counters} option}
-% This outputs a checkpoint.  We do this by saving all counter
-% registers in backup macros starting with |\pr@c@| in their name.  A
-% checkpoint first writes out all changed counters (previously
-% unchecked counters are not written out unless different from zero),
-% then saves all involved counter values.  \LaTeX\ tracks its counters
-% in the global variable \cmd{\cl@ckpt}.
-%    \begin{macrocode}
-%<counters>\ifPreview\else\expandafter\endinput\fi
-%<counters>\def\pr@eltprint#1{\expandafter\@gobble\ifnum\value{#1}=0%
-%<counters>  \csname pr@c@#1\endcsname\else\relax
-%<counters>  \space{#1}{\arabic{#1}}\fi}
-%<counters>\def\pr@eltdef#1{\expandafter\xdef
-%<counters>  \csname pr@c@#1\endcsname{\arabic{#1}}}
-%<counters>\def\pr@ckpt#1{{\let\@elt\pr@eltprint\edef\next{\cl@@ckpt}%
-%<counters>  \ifx\next\@empty\else\typeout{Preview: Counters\next#1}%
-%<counters>  \let\@elt\pr@eltdef\cl@@ckpt\fi}}
-%<counters>\pr@addto@front\pr@ship@start{\pr@ckpt:}
-%<counters>\pr@addto@front\pr@ship@end{\pr@ckpt.}
-%    \end{macrocode}
-%
-% \subsection{Debugging options}
-% Those are for debugging the operation of |preview|, and thus are
-% mostly of interest for people that want to use |preview| for their
-% own purposes.  Since debugging output is potentially confusing to
-% the error message parsing from AUC\TeX, you should not turn on
-% |\tracingonline| or switch from |\nonstopmode| unless you are
-% certain your package will never be used with \previewlatex.
-%
-% \paragraph{The \texttt{showbox} option} will generate diagnostic
-% output for every produced box.  It does not delay the resetting of
-% the |\showboxbreadth| and |\showboxdepth| parameters so that you can
-% still change them after the loading of the package.  It does,
-% however, move them to the end of the package loading, so that they
-% will not be affected by the |auctex| option.
-%    \begin{macrocode}
-%<showbox>\ifPreview\else\expandafter\endinput\fi
-%<showbox>\AtEndOfPackage{%
-%<showbox>  \showboxbreadth\maxdimen
-%<showbox>  \showboxdepth\maxdimen}
-%<showbox>\g@addto@macro\pr@ship@end{\showbox\pr@box}
-%    \end{macrocode}
-%
-% \paragraph{The \texttt{tracingall} option} is for the really heavy
-% diagnostic stuff.  For the reasons mentioned above, we do not want
-% to change the setting of the interaction mode, nor of the
-% |tracingonline| flag.  If the user wants them different, he should
-% set them outside of the preview boxes.
-%    \begin{macrocode}
-%<tracingall>\ifPreview\else\expandafter\endinput\fi
-%<tracingall>\pr@addto@front\pr@ship@start{\let\tracingonline\count@
-%<tracingall>  \let\errorstopmode\@empty\tracingall}
-%    \end{macrocode}
-%
-% \subsection{Supporting conversions}
-% It is not uncommon to want to use the results of |preview| as
-% images.  One possibility is to generate a flurry of EPS files with
-% \begin{quote}
-%   |dvips -E -i -Ppdf -o| \meta{outputfile}|.000| \meta{inputfile}
-% \end{quote}
-% However, in case those are to be processed further into graphic
-% image files by Ghostscript, this process is inefficient.  One cannot
-% use Ghostscript in a single run for generating the files, however,
-% since one needs to set the page size (or full size pages will be
-% produced).  The |tightpage| option will set the page dimensions at
-% the start of each PostScript page so that the output will be sized
-% appropriately.  That way, a single pass of Dvips followed by a
-% single pass of Ghostscript will be sufficient for generating all
-% images.
-%
-% You will have to specify the output driver to be used, either
-% |dvips| or |pdftex|.
-%
-% \begin{macro}{\PreviewBorder}
-% \begin{macro}{\PreviewBbAdjust}
-%   We start this off with the user tunable parameters which get
-%   defined even in the case of an inactive package, so that
-%   redefinitions and assignments to them will always work:
-%    \begin{macrocode}
-%<tightpage>\ifx\PreviewBorder\@undefined
-%<tightpage>  \newdimen\PreviewBorder
-%<tightpage>  \PreviewBorder=0.50001bp
-%<tightpage>\fi
-%<tightpage>\ifx\PreviewBbAdjust\@undefined
-%<tightpage>  \def\PreviewBbAdjust{-\PreviewBorder -\PreviewBorder
-%<tightpage>    \PreviewBorder \PreviewBorder}
-%<tightpage>\fi
-%    \end{macrocode}
-% \end{macro}
-% \end{macro}
-% Here is stuff used for parsing this:
-%    \begin{macrocode}
-%<tightpage>\ifPreview\else\expandafter\endinput\fi
-%<tightpage>\def\pr@nextbb{\edef\next{\next\space\number\dimen@}%
-%<tightpage>  \expandafter\xdef\csname pr@bb@%
-%<tightpage>    \romannumeral\count@\endcsname{\the\dimen@}%
-%<tightpage>  \advance\count@\@ne\ifnum\count@<5
-%<tightpage>  \afterassignment\pr@nextbb\dimen@=\fi}
-%    \end{macrocode}
-% And here is the stuff that we fudge into our hook.  Of course, we
-% have to do it in a box, and we start this box off with our special.
-% There is one small consideration here: it might come before any
-% |\AtBeginDvi| stuff containing header specials.  It turns out Dvips
-% rearranges this amicably: header code specials get transferred to
-% the appropriate header section, anyhow, so this ensures that we come
-% right after the bop section.  We insert the 7~numbers here: the
-% 4~bounding box adjustments, and the 3~\TeX\ box dimensions.  In case
-% the box adjustments have changed since the last time, we write them
-% out to the console.
-%    \begin{macrocode}
-%<tightpage>\ifnum\pr@graphicstype=\z@
-%<tightpage>  \ifcase
-%<tightpage>    \ifx\XeTeXversion\@undefined
-%<tightpage>      \ifx\pdfoutput\@undefined \@ne\fi
-%<tightpage>      \ifx\pdfoutput\relax \@ne\fi
-%<tightpage>      \ifnum\pdfoutput>\z@ \tw@\fi \@ne
-%<tightpage>    \else \thr@@\fi
-%<tightpage>  \or \ExecuteOptions{dvips}\relax
-%<tightpage>  \or \ExecuteOptions{pdftex}\relax
-%<tightpage>  \or \ExecuteOptions{xetex}\relax\fi\fi
-%<tightpage>\global\let\pr@bbadjust\@empty
-%<tightpage>\pr@addto@front\pr@ship@end{\begingroup
-%<tightpage>  \let\next\@gobble
-%<tightpage>  \count@\@ne\afterassignment\pr@nextbb
-%<tightpage>  \dimen@\PreviewBbAdjust
-%<tightpage>  \ifx\pr@bbadjust\next
-%<tightpage>  \else \global\let\pr@bbadjust\next
-%<tightpage>  \typeout{Preview: Tightpage \pr@bbadjust}%
-%<tightpage>  \fi\endgroup}
-%<tightpage>\ifcase\pr@graphicstype
-%<tightpage>\or
-%<tightpage>  \g@addto@macro\pr@ship@end{\setbox\pr@box\hbox{%
-%<tightpage>    \special{ps::\pr@bbadjust\space
-%<tightpage>      \number\ifdim\ht\pr@box>\z@ \ht\pr@box
-%<tightpage>             \else \z@
-%<tightpage>             \fi \space
-%<tightpage>      \number\ifdim\dp\pr@box>\z@ \dp\pr@box
-%<tightpage>             \else \z@
-%<tightpage>             \fi \space
-%<tightpage>      \number\ifdim\wd\pr@box>\z@ \wd\pr@box
-%<tightpage>             \else \z@
-%<tightpage>             \fi}\box\pr@box}}
-%<tightpage>\or
-%<tightpage>  \g@addto@macro\pr@ship@end{{\dimen@\ht\pr@box
-%<tightpage>    \ifdim\dimen@<\z@ \dimen@\z@\fi
-%<tightpage>    \advance\dimen@\pr@bb@iv
-%<tightpage>    \dimen@ii=\dimen@
-%<tightpage>    \global\pdfvorigin\dimen@
-%<tightpage>    \dimen@\dp\pr@box
-%<tightpage>    \ifdim\dimen@<\z@ \dimen@\z@\fi
-%<tightpage>    \advance\dimen@-\pr@bb@ii
-%<tightpage>    \advance\dimen@\dimen@ii
-%<tightpage>    \global\pdfpageheight\dimen@
-%<tightpage>    \dimen@\wd\pr@box
-%<tightpage>    \ifdim\dimen@<\z@ \dimen@=\z@\fi
-%<tightpage>    \advance\dimen@-\pr@bb@i
-%<tightpage>    \advance\dimen@\pr@bb@iii
-%<tightpage>    \global\pdfpagewidth\dimen@
-%<tightpage>    \global\pdfhorigin-\pr@bb@i}}
-%<tightpage>\or
-%<tightpage>  \g@addto@macro\pr@ship@end{\dimen@\ht\pr@box
-%<tightpage>    \ifdim\dimen@<\z@ \dimen@\z@\fi
-%<tightpage>    \advance\dimen@\pr@bb@iv
-%<tightpage>    \dimen@ii=\dimen@
-%<tightpage>    \voffset=-1in
-%<tightpage>    \advance\voffset\dimen@
-%<tightpage>    \advance\voffset-\ht\pr@box
-%<tightpage>    \dimen@\dp\pr@box
-%<tightpage>    \ifdim\dimen@<\z@ \dimen@\z@\fi
-%<tightpage>    \advance\dimen@-\pr@bb@ii
-%<tightpage>    \advance\dimen@\dimen@ii
-%<tightpage>    \global\pdfpageheight\dimen@
-%<tightpage>    \global\paperheight\dimen@
-%<tightpage>    \dimen@\wd\pr@box
-%<tightpage>    \ifdim\dimen@<\z@ \dimen@=\z@\fi
-%<tightpage>    \advance\dimen@-\pr@bb@i
-%<tightpage>    \advance\dimen@\pr@bb@iii
-%<tightpage>    \global\pdfpagewidth\dimen@
-%<tightpage>    \hoffset=-1in
-%<tightpage>    \advance\hoffset-\pr@bb@i
-%<tightpage>    \let\pr@offset@override\@empty}
-%<tightpage>\fi
-%    \end{macrocode}
-% Ok, here comes the beef.  First we fish the 7~numbers from the file
-% with |token| and convert them from \TeX~|sp| to PostScript points.
-%    \begin{macrocode}
-%<tightpage>\ifnum\pr@graphicstype=\@ne
-%<tightpage>\preview@delay{\AtBeginDvi{%
-%    \end{macrocode}
-% Backwards-compatibility. Once we are certain that dvipng-1.6 or
-% later is widely used, the three following specials can be exchanged
-% for the simple |\special{!/preview@tightpage true def}|
-%    \begin{macrocode}
-%<tightpage>  \special{!/preview@tightpage true def (%
-%<tightpage>     compatibility PostScript comment for dvipng<=1.5 }
-%<tightpage>  \special{!userdict begin/bop-hook{%
-%<tightpage>     7{currentfile token not{stop}if 
-%<tightpage>       65781.76 div DVImag mul}repeat
-%<tightpage>       72 add 72 2 copy gt{exch}if 4 2 roll
-%<tightpage>       neg 2 copy lt{exch}if dup 0 gt{pop 0 exch}%
-%<tightpage>       {exch dup 0 lt{pop 0}if}ifelse 720 add exch 720 add
-%<tightpage>       3 1 roll
-%<tightpage>       4{5 -1 roll add 4 1 roll}repeat 
-%<tightpage>     <</PageSize[5 -1 roll 6 index sub 5 -1 roll 5 index sub]%
-%<tightpage>       /PageOffset[7 -2 roll [1 1 dtransform exch]%
-%<tightpage>       {0 ge{neg}if exch}forall]>>setpagedevice%
-%<tightpage>       //bop-hook exec}bind def end}
-%<tightpage>  \special{!userdict (some extra code to avoid 
-%<tightpage>     dvipng>=1.6 unknown special:
-%<tightpage>       7{currentfile token not{stop}if 65781.76 div })) pop}
-%    \end{macrocode}
-% The ``userdict'' at the start of the last special is also there to
-% avoid an unknown special in dvipng<=1.6. This is the end of the
-% backwards-compatibility code.
-%    \begin{macrocode}
-%<tightpage>  \special{!userdict begin/bop-hook{%
-%<tightpage>  preview-bop-level 0 le{%
-%<tightpage>     7{currentfile token not{stop}if
-%<tightpage>       65781.76 div DVImag mul}repeat
-%    \end{macrocode}
-% Next we produce the horizontal part of the bounding box as
-% \[ (1\mathrm{in},1\mathrm{in}) +
-% \bigl(\min(|\wd\pr@box|,0),\max(|\wd\pr@box|,0)\bigr) \]
-% and roll it to the bottom of the stack:
-%    \begin{macrocode}
-%<tightpage>     72 add 72 2 copy gt{exch}if 4 2 roll
-%    \end{macrocode}
-% Next is the vertical part of the bounding box.  Depth counts in
-% negatively, and we again take $\min$ and $\max$ of possible extents
-% in the vertical direction, limited by 0.  720 corresponds to
-% $10\,\mathrm{in}$ and is the famous $1\,\mathrm{in}$ distance away
-% from the edge of letterpaper.
-%    \begin{macrocode}
-%<tightpage>     neg 2 copy lt{exch}if dup 0 gt{pop 0 exch}%
-%<tightpage>     {exch dup 0 lt{pop 0}if}ifelse 720 add exch 720 add
-%<tightpage>     3 1 roll
-%    \end{macrocode}
-% Ok, we now have the bounding box on the stack in the proper order
-% llx, lly, urx, ury.  We add the adjustments:
-%    \begin{macrocode}
-%<tightpage>    4{5 -1 roll add 4 1 roll}repeat
-%    \end{macrocode}
-% The page size is calculated as the appropriate differences, the page
-% offset consists of the coordinates of the lower left corner, with
-% those coordinates negated that would be reckoned positive in the
-% device coordinate system.
-%    \begin{macrocode}
-%<tightpage>     <</PageSize[5 -1 roll 6 index sub 5 -1 roll 5 index sub]%
-%<tightpage>       /PageOffset[7 -2 roll [1 1 dtransform exch]%
-%<tightpage>       {0 ge{neg}if exch}forall]>>setpagedevice}if%
-%    \end{macrocode}
-% So we now bind the old definition of |bop-hook| into our new
-% definition and finish it.
-%    \begin{macrocode}
-%<tightpage>     //bop-hook exec}bind def end}}}
-%<tightpage>\fi
-%    \end{macrocode}
-%
-% \subsection{The \texttt{showlabels} option}
-% During the editing process, some people like to see the label names
-% in their equations, figures and the like.  Now if you are using
-% Emacs for editing, and in particular \previewlatex, I'd strongly
-% recommend that you check out the Ref\TeX\ package which pretty much
-% obliterates the need for this kind of functionality.  If you still
-% want it, standard \LaTeX\ provides it with the |showkeys| package,
-% and there is also the less encompassing |showlabels| package.
-% Unfortunately, since those go to some pain not to change the page
-% layout and spacing, they also don't change |preview|'s idea of the
-% \TeX\ dimensions of the involved boxes.
-%
-% So those packages are mostly useless.  So we present here an
-% alternative hack that will get the labels through.
-% \begin{macro}{\pr@labelbox}
-%   This works by collecting them into a separate box which we then
-%   tack to the right of the previews.
-%    \begin{macrocode}
-%<showlabels>\ifPreview\else\expandafter\endinput\fi
-%<showlabels>\newbox\pr@labelbox
-%    \end{macrocode}
-% \end{macro}
-% \begin{macro}{\pr@label}
-%   We follow up with our own definition of the \cmd{\label} macro
-%   which will be active only in previews.  The original definition is
-%   stored in |\pr@@label|.  |\pr@lastlabel| contains the last typeset
-%   label in order to avoid duplication in certain environments, and
-%   we keep the stuff in |\pr@labelbox|.
-%    \begin{macrocode}
-%<showlabels>\def\pr@label#1{\pr@@label{#1}%
-%    \end{macrocode}
-%   Ok, now we generate the box, by placing the label below any existing
-%   stuff.
-%    \begin{macrocode}
-%<showlabels>   \ifpr@setbox\z@{#1}%
-%<showlabels>     \global\setbox\pr@labelbox\vbox{\unvbox\pr@labelbox
-%<showlabels>      \box\z@}\egroup\fi}
-%    \end{macrocode}
-% \end{macro}
-% \begin{macro}{\ifpr@setbox}
-%   |\ifpr@setbox| receives two arguments, |#1| is the box into which
-%   to set a label, |#2| is the label text itself.  If a label needs
-%   to be set (if it is not a duplicate in the current box, and is
-%   nonempty, and we are in the course of typesetting and so on), we
-%   are left in a true conditional and an open group with the preset
-%   box.  If nothing should be set, no group is opened, and we get
-%   into skipping to the closing of the conditional.  Since
-%   |\ifpr@setbox| is a macro, you should not place the call to it
-%   into conditional text, since it will not pair up with |\fi| until
-%   being expanded.
-%
-%   We have some trickery involved here.  |\romannumeral\z@| expands
-%   to empty, and will also remove everything between the two of them
-%   that also expands to empty, like a chain of |\fi|.
-%    \begin{macrocode}
-%<showlabels>\def\ifpr@setbox#1#2{%
-%<showlabels>  \romannumeral%
-%<showlabels>  \ifx\protect\@typeset@protect\ifpr@outer\else
-%    \end{macrocode}
-%   Ignore empty labels\dots
-%    \begin{macrocode}
-%<showlabels>   \z@\bgroup
-%<showlabels>   \protected@edef\next{#2}\@onelevel@sanitize\next
-%<showlabels>   \ifx\next\@empty\egroup\romannumeral\else
-%    \end{macrocode}
-%   and labels equal to the last one.
-%    \begin{macrocode}
-%<showlabels>   \ifx\next\pr@lastlabel\egroup\romannumeral\else
-%<showlabels>   \global\let\pr@lastlabel\next
-%<showlabels>   \setbox#1\pr@boxlabel\pr@lastlabel
-%<showlabels>   \expandafter\expandafter\romannumeral\fi\fi\fi\fi
-%<showlabels>   \z@\iffalse\iftrue\fi}
-%    \end{macrocode}
-% \end{macro}
-% \begin{macro}{\pr@boxlabel}
-%   Now the actual typesetting of a label box is done.  We use a small
-%   typewriter font inside of a framed box (the default frame/box
-%   separating distance is a bit large).
-%    \begin{macrocode}
-%<showlabels>\def\pr@boxlabel#1{\hbox{\normalfont
-%<showlabels>   \footnotesize\ttfamily\fboxsep0.4ex\relax\fbox{#1}}}
-%    \end{macrocode}
-% \end{macro}
-% \begin{macro}{\pr@maketag}
-%   And here is a version for |amsmath| equations.  They look better
-%   when the label is right beside the tag, so we place it there, but
-%   augment |\box\pr@labelbox| with an appropriate placeholder.
-%    \begin{macrocode}
-%<showlabels>\def\pr@maketag#1{\pr@@maketag{#1}%
-%<showlabels>  \ifpr@setbox\z@{\df@label}%
-%<showlabels>      \global\setbox\pr@labelbox\vbox{%
-%<showlabels>         \hrule\@width\wd\z@\@height\z@
-%<showlabels>         \unvbox\pr@labelbox}%
-%    \end{macrocode}
-%   Set the width of the box to empty so that the label placement gets
-%   not disturbed, then append it.
-%    \begin{macrocode}
-%<showlabels>        \wd\z@\z@\box\z@ \egroup\fi}
-%    \end{macrocode}
-% \end{macro}
-% \begin{macro}{\pr@lastlabel}
-%   Ok, here is how we activate this: we clear out box and label info
-%    \begin{macrocode}
-%<showlabels>\g@addto@macro\pr@ship@start{%
-%<showlabels>  \global\setbox\pr@labelbox\box\voidb@x
-%<showlabels>  \xdef\pr@lastlabel{}%
-%    \end{macrocode}
-%   The definitions above are global because we might be in any amount
-%   of nesting.  We then reassign the appropriate labelling macros:
-%    \begin{macrocode}
-%<showlabels>  \global\let\pr@@label\label \let\label\pr@label
-%<showlabels>  \global\let\pr@@maketag\maketag@@@
-%<showlabels>  \let\maketag@@@\pr@maketag
-%<showlabels>}
-%    \end{macrocode}
-% \end{macro}
-% Now all we have to do is to add the stuff to the box in question.
-% The stuff at the front works around a bug in |ntheorem.sty|.
-%    \begin{macrocode}
-%<showlabels>\pr@addto@front\pr@ship@end{%
-%<showlabels>   \ifx \label\pr@label \global\let\label\pr@@label \fi
-%<showlabels>   \ifx \maketag@@@\pr@maketag
-%<showlabels>        \global\let\maketag@@@\pr@@maketag \fi
-%<showlabels>   \ifvoid\pr@labelbox
-%<showlabels>   \else \setbox\pr@box\hbox{%
-%<showlabels>         \box\pr@box\,\box\pr@labelbox}%
-%<showlabels>   \fi}
-%    \end{macrocode}
-% \subsection{The \texttt{footnotes} option}
-% This is rather simplistic right now.  It overrides the default
-% footnote action (which is to disable footnotes altogether for better
-% visibility).
-%    \begin{macrocode}
-%<footnotes>\PreviewMacro[[!]\footnote %]
-%    \end{macrocode}
-%
-% \section{Various driver files}
-% The installer, in case it is missing.  If it is to be used via
-% |make|, we don't specify an installation path, since
-% \begin{quote}
-%   |make install|
-% \end{quote}
-% is supposed to cater for the installation itself.
-%    \begin{macrocode}
-%<installer> \input docstrip
-%<installer&make> \askforoverwritefalse
-%<installer> \generate{
-%<installer>    \file{preview.drv}{\from{preview.dtx}{driver}}
-%<installer&!make>    \usedir{tex/latex/preview}
-%<installer>    \file{preview.sty}{\from{preview.dtx}{style}
-%<installer>                       \from{preview.dtx}{style,active}}
-%<installer>    \file{prauctex.def}{\from{preview.dtx}{auctex}}
-%<installer>    \file{prauctex.cfg}{\from{preview.dtx}{auccfg}}
-%<installer>    \file{prshowbox.def}{\from{preview.dtx}{showbox}}
-%<installer>    \file{prshowlabels.def}{\from{preview.dtx}{showlabels}}
-%<installer>    \file{prtracingall.def}{\from{preview.dtx}{tracingall}}
-%<installer>    \file{prtightpage.def}{\from{preview.dtx}{tightpage}}
-%<installer>    \file{prlyx.def}{\from{preview.dtx}{lyx}}
-%<installer>    \file{prcounters.def}{\from{preview.dtx}{counters}}
-%<installer>    \file{prfootnotes.def}{\from{preview.dtx}{footnotes}}
-%<installer> }
-%<installer> \endbatchfile
-%    \end{macrocode}
-% And here comes the documentation driver.
-%    \begin{macrocode}
-%<driver> \documentclass{ltxdoc}
-%<driver> \usepackage{preview}
-%<driver> \let\ifPreview\relax
-%<driver> \newcommand\previewlatex{\texttt{preview-latex}}
-%<driver> \begin{document}
-%<driver> \DocInput{preview.dtx}
-%<driver> \end{document}
-%    \end{macrocode}
-% \Finale{}
-% \iffalse
-% Local Variables: 
-% mode: doctex
-% TeX-master: "preview.drv"
-% End: 
-% \fi