diff --git a/src/mathrendertask.cpp b/src/mathrendertask.cpp
--- a/src/mathrendertask.cpp
+++ b/src/mathrendertask.cpp
@@ -33,21 +33,21 @@
 #include "lib/renderer.h"
 #include "lib/latexrenderer.h"
 
-static const QLatin1String mathTex("\\documentclass%9{standalone}"\
+static const QLatin1String mathTex("\\documentclass%9{minimal}"\
                          "\\usepackage{amsfonts,amssymb}"\
                          "\\usepackage{amsmath}"\
                          "\\usepackage[utf8]{inputenc}"\
+                         "\\usepackage[active,displaymath,textmath,tightpage]{preview}"\
                          "\\usepackage{color}"\
-                         /*
-                         "\\setlength\\textwidth{5in}"\
-                         "\\setlength{\\parindent}{0pt}"\
-                         "\\pagestyle{empty}"\
-                         */
                          "\\begin{document}"\
-                         "\\pagecolor[rgb]{%1,%2,%3}"\
+                         "\\begin{preview}"\
+                         "$"\
+                         "\\colorbox[rgb]{%1,%2,%3}{"\
                          "\\color[rgb]{%4,%5,%6}"\
                          "\\fontsize{%7}{%7}\\selectfont"\
-                         "%8"\
+                         "%8}"\
+                         "$"\
+                         "\\end{preview}"
                          "\\end{document}");
 
 static const QLatin1String eqnHeader("$\\displaystyle %1$");
@@ -82,23 +82,23 @@
     QTemporaryFile texFile(tempDir + QDir::separator() + QLatin1String("cantor_tex-XXXXXX.tex"));
     texFile.open();
 
-    // Verify that standalone.cls available for rendering and could be founded
-    if (!tempDir.contains(QLatin1String("standalone.cls")))
+    // make sure we have preview.sty available
+    if (!tempDir.contains(QLatin1String("preview.cls")))
     {
-        QString file = QStandardPaths::locate(QStandardPaths::AppDataLocation, QLatin1String("latex/standalone.cls"));
+        QString file = QStandardPaths::locate(QStandardPaths::AppDataLocation, QLatin1String("latex/preview.sty"));
 
         if (file.isEmpty())
-            file = QStandardPaths::locate(QStandardPaths::GenericDataLocation, QLatin1String("cantor/latex/standalone.cls"));
+            file = QStandardPaths::locate(QStandardPaths::GenericDataLocation, QLatin1String("cantor/latex/preview.sty"));
 
         if (file.isEmpty())
         {
             result->successful = false;
-            result->errorMessage = QString::fromLatin1("needed for math render standalone.cls file not found in Cantor data directory");
+            result->errorMessage = QString::fromLatin1("LaTeX style file preview.sty not found.");
             finalize(result);
             return;
         }
         else
-            QFile::copy(file, tempDir + QDir::separator() + QLatin1String("standalone.cls"));
+            QFile::copy(file, tempDir + QDir::separator() + QLatin1String("preview.sty"));
     }
     QString expressionTex=mathTex;
 
diff --git a/thirdparty/CMakeLists.txt b/thirdparty/CMakeLists.txt
--- a/thirdparty/CMakeLists.txt
+++ b/thirdparty/CMakeLists.txt
@@ -29,4 +29,4 @@
 add_dependencies(Discount::Lib discount_project-build)
 
 # preview.sty
-install(FILES standalone.cls DESTINATION  ${KDE_INSTALL_DATADIR}/cantor/latex)
+install(FILES preview.sty DESTINATION  ${KDE_INSTALL_DATADIR}/cantor/latex)
diff --git a/thirdparty/README.md b/thirdparty/README.md
--- a/thirdparty/README.md
+++ b/thirdparty/README.md
@@ -14,7 +14,15 @@
 * Better recognition of the mathematical expressions between $...$, $$...$$
 
 
-## standalone.cls
-This file provides the LaTeX class and package 'standalone' ([link](https://ctan.org/tex-archive/macros/latex/contrib/standalone)),
-which allows TeX pictures or other TeX code in sub-files to be compiled standalone or as part of a main document.
-This package is used for the rendering of mathematical LaTeX expressions embedded in the Cantor's worksheet.
+## preview.sty
+This file provides the LaTeX style 'preview' ([link](https://www.ctan.org/tex-archive/macros/latex/contrib/preview)).
+
+The main purpose of the preview package is the extraction of selected
+elements from a LaTeX source, like formulas or graphics, into separate
+pages of a DVI file.  A flexible and convenient interface allows it to
+specify what commands and constructs should be extracted.  This works
+with DVI files postprocessed by either Dvips and Ghostscript or
+dvipng, but it also works when you are using PDFTeX for generating PDF
+files.
+
+This package is used for the rendering of mathematical LaTeX expressions embedded in Cantor's worksheet.
diff --git a/thirdparty/preview.sty b/thirdparty/preview.sty
new file mode 100644
--- /dev/null
+++ b/thirdparty/preview.sty
@@ -0,0 +1,392 @@
+%%
+%% This is file `preview.sty',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% preview.dtx  (with options: `style')
+%% preview.dtx  (with options: `style,active')
+%% 
+%% IMPORTANT NOTICE:
+%% 
+%% For the copyright see the source file.
+%% 
+%% Any modified versions of this file must be renamed
+%% with new filenames distinct from preview.sty.
+%% 
+%% For distribution of the original source see the terms
+%% for copying and modification in the file preview.dtx preview.dtx.
+%% 
+%% This generated file may be distributed as long as the
+%% original source files, as listed above, are part of the
+%% same distribution. (The sources need not necessarily be
+%% in the same archive or directory.)
+%%    The preview style for extracting previews from LaTeX documents.
+%%    Developed as part of AUCTeX <URL:http://www.gnu.org/software/auctex>.
+\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_90 $ \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: 2017/04/24 13:20:00 $
+\edef\next{\noexpand\ProvidesPackage{preview}%
+  [\next\space \pr@version\space (AUCTeX/preview-latex)]}
+\next
+\let\ifPreview\iffalse
+\let\preview@delay=\@gobble
+\let\pr@advise=\@gobbletwo
+\long\def\pr@advise@ship#1#2#3{}
+\def\pr@loadcfg#1{\InputIfFileExists{#1.cfg}{}{}}
+\IfFileExists{luatex85.sty}{\RequirePackage{luatex85}}{}
+\DeclareOption{noconfig}{\let\pr@loadcfg=\@gobble}
+\long\def\pr@addto@front#1#2{%
+  \toks@{#2}\toks@\expandafter{\the\expandafter\toks@#1}%
+  \xdef#1{\the\toks@}}
+\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}
+\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@}}}
+\DeclareOption{delayed}{%
+  \ifPreview \def\preview@delay{\AtBeginDocument}\fi
+}
+\newif\ifpr@fixbb
+\pr@fixbbfalse
+\DeclareOption{psfixbb}{\ifPreview%
+  \pr@fixbbtrue
+  \newbox\pr@markerbox
+  \setbox\pr@markerbox\hbox{\special{psfile=/dev/null}}\fi
+}
+\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}}}}
+\DeclareOption{pdftex}{%
+  \let\pr@graphicstype\tw@}
+\DeclareOption{xetex}{%
+  \let\pr@graphicstype\thr@@}
+\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}%
+}}
+\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
+\DeclareOption{graphics}{%
+  \PreviewMacro[*[[!]{\includegraphics}%]]
+}
+\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
+\DeclareOption{sections}{%
+  \PreviewMacro[!!!!!!*[[!]{\@startsection}%]]
+  \PreviewMacro[*[[!]{\chapter}%]]
+}
+\DeclareOption*
+   {\InputIfFileExists{pr\CurrentOption.def}{}{\OptionNotUsed}}
+\def\PreviewMacro{\@ifstar\pr@starmacro\pr@macro}
+\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}
+\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[]}}
+\def\PreviewOpen{\@ifstar\pr@starmacro\pr@open}
+\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}
+\def\PreviewClose{\@ifstar\pr@starmacro\pr@close}
+\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}
+\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 %]
+ }
+\newcommand{\PreviewSnarfEnvironment}[2][]{%
+  \expandafter\pr@advise
+   \csname #2\endcsname{\pr@snarfafter{#1}}%
+ \expandafter\pr@advise
+   \csname end#2\endcsname{\pr@endsnarf}}
+\let\pr@ship@start\@empty
+\let\pr@ship@end\@empty
+\newenvironment{preview}{\ignorespaces}{\ifhmode\unskip\fi}
+\newenvironment{nopreview}{\ignorespaces}{\ifhmode\unskip\fi}
+\ProcessOptions\relax
+\ifPreview\else\expandafter\endinput\fi
+%%    The preview style for extracting previews from LaTeX documents.
+%%    Developed as part of AUCTeX <URL:http://www.gnu.org/software/auctex>.
+\newif\ifpr@outer
+\pr@outertrue
+\newcount\pr@snippet
+\global\pr@snippet=1
+\def\pr@protect{\ifx\protect\@typeset@protect
+  \ifpr@outer \expandafter\expandafter\expandafter
+     \@secondoftwo\fi\fi\@gobble}
+\def\pr@protect@ship{\pr@protect{\@firstoftwo\pr@startbox}%
+   \@gobbletwo}
+\def\pr@insert{\begingroup\afterassignment\pr@insertii\count@}
+\def\pr@insertii{\endgroup\setbox\pr@box\vbox}
+\def\pr@mark{{\afterassignment}\toks@}
+\def\pr@marks{{\aftergroup\pr@mark\afterassignment}\count@}
+\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}}
+\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
+     }%
+   \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
+}
+\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}
+\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
+\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}}
+\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}]}}
+\expandafter\let\csname pr@parse]\endcsname=\pr@parseit
+\long\def\pr@parse#1\pr@endparse#2#3{%
+  \pr@parseit#1\pr@endparse{#2{#3}}}
+\expandafter\let\csname pr@parse!\endcsname=\pr@parse
+\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@}
+ \long\def\pr@parse@#1#2\pr@endparse#3{%
+   \pr@parseit #2\pr@endparse{#3#1}}
+\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= }
+\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}
+\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}
+\def\pr@endaftergroup#1{#1\aftergroup\pr@endbox}
+\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}
+\renewenvironment{preview}{\begingroup
+   \pr@startbox{\begingroup\aftergroup\pr@endbox}%
+               {\endgroup}%
+   \ignorespaces}%
+   {\ifhmode\unskip\fi\endgroup}
+\renewenvironment{nopreview}{\pr@outerfalse\ignorespaces}%
+  {\ifhmode\unskip\fi}
+\newtoks\pr@output
+\pr@output\output
+\output{%
+  \pr@outerfalse
+  \let\@begindvi\@empty
+  \the\pr@output}
+\let\output\pr@output
+\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}
+\pr@loadcfg{prdefault}
+\endinput
+%%
+%% End of file `preview.sty'.
diff --git a/thirdparty/standalone.cls b/thirdparty/standalone.cls
deleted file mode 100644
--- a/thirdparty/standalone.cls
+++ /dev/null
@@ -1,954 +0,0 @@
-%% Copyright (C) 2011-2012 by Martin Scharrer <martin@scharrer-online.de>
-%% ---------------------------------------------------------------------------
-%% This work may be distributed and/or modified under the
-%% conditions of the LaTeX Project Public License, either version 1.3
-%% of this license or (at your option) any later version.
-%% The latest version of this license is in
-%%   http://www.latex-project.org/lppl.txt
-%% and version 1.3 or later is part of all distributions of LaTeX
-%% version 2005/12/01 or later.
-%%
-%% This work has the LPPL maintenance status `maintained'.
-%%
-%% The Current Maintainer of this work is Martin Scharrer.
-%%
-%% This work consists of the files standalone.dtx and standalone.ins
-%% and the derived filebase standalone.sty, standalone.cls and
-%% standalone.cfg.
-%%
-\NeedsTeXFormat{LaTeX2e}
-\ProvidesClass{standalone}[%
-    2015/07/15
-    v1.2
-    Class to compile TeX sub-files standalone]
-\newif\ifstandalone
-\standalonetrue
-\newif\ifstandalonebeamer
-\standalonebeamerfalse
-\let\onlyifstandalone\@firstofone
-\let\IfStandalone\@firstoftwo
-\def\sa@border@left{0.50001bp}
-\let\sa@border@right\sa@border@left
-\let\sa@border@top\sa@border@left
-\let\sa@border@bottom\sa@border@left
-\def\rem@bp#1bp\relax#2\@nnil{#1}%
-\def\default@bp#1#2{%
-    \begingroup
-    \afterassignment\remove@to@nnil
-    \dimen@ #2bp\relax\@nnil
-    \expandafter
-    \endgroup
-    \expandafter
-    \def\expandafter#1\expandafter{\the\dimen@}%
-}
-\def\sa@readborder#1 #2 #3 #4 #5\@nnil{%
-    \ifx\\#2#3#4\\%
-        \default@bp\sa@border@left{#1}%
-        \let\sa@border@right\sa@border@left
-        \let\sa@border@top\sa@border@left
-        \let\sa@border@bottom\sa@border@left
-    \else
-    \ifx\\#4\\%
-        \default@bp\sa@border@left{#1}%
-        \let\sa@border@right\sa@border@left
-        \default@bp\sa@border@top{#2}%
-        \let\sa@border@bottom\sa@border@top
-    \else
-        \default@bp\sa@border@left{#1}%
-        \default@bp\sa@border@bottom{#2}%
-        \default@bp\sa@border@right{#3}%
-        \default@bp\sa@border@top{#4}%
-    \fi\fi
-}%
-\expandafter\ifx\csname ifluatex\endcsname\relax
-    \IfFileExists{ifluatex.sty}{\@firstoftwo}{\@secondoftwo}{%
-        \RequirePackage{ifluatex}
-    }{
-        \begingroup
-        \expandafter\ifx\csname directlua\endcsname\relax
-            \endgroup
-            \expandafter\let\csname ifluatex\expandafter\endcsname\csname iffalse\endcsname
-        \else
-            \endgroup
-            \expandafter\let\csname ifluatex\expandafter\endcsname\csname iftrue\endcsname
-        \fi
-    }
-\fi
-\expandafter\ifx\csname ifpdf\endcsname\relax
-    \IfFileExists{ifpdf.sty}{\@firstoftwo}{\@secondoftwo}{%
-        \RequirePackage{ifpdf}
-    }{
-        \begingroup
-        \expandafter\ifx\csname pdfoutput\endcsname\relax
-            \endgroup
-            \expandafter\let\csname ifpdf\expandafter\endcsname\csname iffalse\endcsname
-        \else
-            \endgroup
-            \ifnum\pdfoutput<1
-                \expandafter\let\csname ifpdf\expandafter\endcsname\csname iffalse\endcsname
-            \else
-                \expandafter\let\csname ifpdf\expandafter\endcsname\csname iftrue\endcsname
-            \fi
-        \fi
-    }
-\fi
-\expandafter\ifx\csname ifxetex\endcsname\relax
-    \IfFileExists{ifxetex.sty}{\@firstoftwo}{\@secondoftwo}{%
-        \RequirePackage{ifxetex}
-    }{
-        \begingroup
-        \expandafter\ifx\csname XeTeXrevision\endcsname\relax
-            \endgroup
-            \expandafter\let\csname ifxetex\expandafter\endcsname\csname iffalse\endcsname
-        \else
-            \endgroup
-            \expandafter\let\csname ifxetex\expandafter\endcsname\csname iftrue\endcsname
-        \fi
-    }
-\fi
-\let\sa@classoptionslist\@classoptionslist
-\RequirePackage{xkeyval}
-\newif\ifsa@preview
-\newif\ifsa@crop
-\newif\ifsa@multi
-\newif\ifsa@multido
-\newif\ifsa@varwidth
-\newif\ifsa@ignorerest
-\newif\ifsa@ignoreempty
-\newif\ifsa@tikz
-\newif\ifsa@pstricks
-\newif\ifsa@convert
-\newif\ifsa@float
-\newif\ifsa@math
-\let\sa@beamertrue\standalonebeamertrue
-\let\sa@beamerfalse\standalonebeamerfalse
-\def\sa@clsoption{%
-    \define@key{standalone.cls}%
-}
-\sa@clsoption{border}{%
-    \sa@readborder#1 {} {} {} {} \@nnil
-}
-\sa@clsoption{margin}{%
-    \sa@readborder#1 {} {} {} {} \@nnil
-}
-\def\sa@boolean#1#2{%
-    \sa@boolorvalue{#1}{#2}%
-        {\ClassError{standalone}{Invalid value '#2' for boolean key '#1'}{}}%
-}
-\def\sa@boolorvalue#1#2{%
-    \begingroup
-    \edef\@tempa{#2}%
-    \def\@tempb{true}%
-    \ifx\@tempa\@tempb
-        \endgroup
-        \csname sa@#1true\endcsname
-        \expandafter\@gobble
-    \else
-    \def\@tempb{false}%
-    \ifx\@tempa\@tempb
-        \endgroup
-        \csname sa@#1false\endcsname
-        \expandafter\expandafter
-        \expandafter\@gobble
-    \else
-        \endgroup
-        \expandafter\expandafter
-        \expandafter\@firstofone
-    \fi\fi
-}
-\sa@clsoption{preview}[true]{%
-    \sa@boolean{preview}{#1}%
-    \ifsa@preview
-        \setkeys{standalone.cls}{crop=false,float=false}%
-    \fi
-}
-\sa@previewtrue
-\sa@clsoption{crop}[true]{%
-    \sa@boolean{crop}{#1}%
-    \ifsa@crop
-        \setkeys{standalone.cls}{preview=false,float=false}%
-    \fi
-}
-\sa@clsoption{ignorerest}[true]{%
-    \sa@boolean{ignorerest}{#1}%
-}
-\sa@clsoption{ignoreempty}[true]{%
-    \sa@boolean{ignoreempty}{#1}%
-}
-\sa@clsoption{multi}[true]{%
-    \sa@boolorvalue{multi}{#1}{\sa@multitrue\AtBeginDocument{\standaloneenv{#1}}}%
-}
-\sa@clsoption{multido}[true]{%
-    \sa@boolean{multido}{#1}%
-    \ifsa@multido
-        \setkeys{standalone.cls}{multi=samultido}%
-    \fi
-}
-\sa@clsoption{math}[true]{%
-    \sa@boolean{math}{#1}%
-    \ifsa@math
-        \setkeys{standalone.cls}{multi=true,ignoreempty=true,border=0.50001bp}%
-    \fi
-}
-\AtBeginDocument{\ifsa@math\sa@math\fi}
-\def\sa@math{%
-    \standaloneenv{math}%
-    \def\({\begingroup\math}%
-    \def\){\endmath\endgroup}%
-    \def\[{\(\displaystyle}%
-    \def\]{\)}%
-    \def\displaymath{\math\displaystyle}%
-    \def\enddisplaymath{\endmath}%
-    \newcommand*\multimathsep{%
-        \endmath
-        \math
-        \let\\\multimathsep
-    }%
-    \newenvironment{multimath}{%
-        \math
-        \let\\\multimathsep
-    }{%
-        \endmath
-    }%
-    \newcommand*\multidisplaymathsep{%
-        \endmath
-        \math\displaystyle
-        \let\\\multidisplaymathsep
-    }%
-    \newenvironment{multidisplaymath}{%
-        \math\displaystyle
-        \let\\\multidisplaymathsep
-    }{%
-        \endmath
-    }%
-}
-\sa@clsoption{varwidth}[true]{%
-    \sa@boolorvalue{varwidth}{#1}{\sa@varwidthtrue\def\sa@width{#1}}%
-    \ifsa@varwidth
-        \def\sa@varwidth{\varwidth{\sa@width}}%
-        \def\sa@endvarwidth{\endvarwidth}%
-    \else
-        \let\sa@varwidth\@empty
-        \let\sa@endvarwidth\@empty
-    \fi
-}
-\let\sa@varwidth\@empty
-\let\sa@endvarwidth\@empty
-\sa@clsoption{tikz}[true]{%
-    \sa@boolean{tikz}{#1}%
-    \ifsa@tikz
-        \setkeys{standalone.cls}{multi=tikzpicture,varwidth=false}%
-    \fi
-}
-\sa@clsoption{pstricks}[true]{%
-    \sa@boolean{pstricks}{#1}%
-    \ifsa@pstricks
-        \setkeys{standalone.cls}{multi=pspicture,varwidth=false}%
-    \fi
-}
-\sa@clsoption{beamer}[true]{%
-    \sa@boolean{beamer}{#1}%
-    \ifstandalonebeamer
-        \def\sa@class{beamer}%
-        \setkeys{standalone.cls}{preview=false,crop=false,varwidth=false}%
-    \else
-        \begingroup
-        \def\@tempa{beamer}%
-        \ifx\@tempa\sa@class
-            \endgroup
-            \def\sa@class{article}%
-        \else
-            \endgroup
-        \fi
-    \fi
-}
-\sa@clsoption{class}{%
-    \def\sa@class{#1}%
-}
-\def\sa@class{article}
-\sa@clsoption{float}[true]{%
-    \sa@boolean{float}{#1}%
-    \ifsa@float
-        \let\@float\sa@origfloat
-        \let\end@float\sa@origendfloat
-    \else
-        \ifx\@float\sa@nofloat\else
-            \let\sa@origfloat\@float
-        \fi
-        \ifx\end@float\sa@endnofloat\else
-            \let\sa@origendfloat\end@float
-        \fi
-        \let\@float\sa@nofloat
-        \let\end@float\sa@endnofloat
-    \fi
-}
-\def\sa@nofloat#1{%
-    \def\@captype{#1}%
-    \trivlist\item[]%
-    \@ifnextchar[{%
-        \begingroup
-        \def\@tempa[####1]{%
-            \endgroup
-        }\@tempa
-    }{}%
-}
-\def\sa@endnofloat{%
-    \endtrivlist
-}
-\sa@clsoption{convert}[]{%
-    \setkeys{standalone.cls/convert}{true,#1}%
-}
-\sa@clsoption{disable@convert}[]{%
-    \typeout{Disable conversion}
-    \sa@convertfalse
-    \let\sa@converttrue\relax
-}
-\def\sa@convertoption{%
-    \define@key{standalone.cls/convert}%
-}
-\def\sa@convertvar#1#2{%
-    \define@key{standalone.cls/convert}{#1}{%
-        \@namedef{sa@convert@#1}{##1}%
-    }%
-    \@namedef{sa@convert@#1}{#2}%
-}
-\sa@convertoption{true}[]{%
-    \sa@converttrue
-}
-\sa@convertoption{false}[]{%
-    \sa@convertfalse
-}
-\sa@convertoption{png}[]{%
-    \setkeys{standalone.cls/convert}{true,outext={.png}}%
-}
-\sa@clsoption{png}[]{%
-    \setkeys{standalone.cls/convert}{png,#1}%
-}
-\sa@convertoption{realmainfile}[]{%
-    \RequirePackage{currfile-abspath}%
-    \getmainfile
-    \let\sa@convert@mainfile\themainfile
-}
-\sa@convertoption{jpg}[]{%
-    \setkeys{standalone.cls/convert}{true,outext={.jpg}}%
-}
-\sa@clsoption{jpg}[]{%
-    \setkeys{standalone.cls/convert}{jpg,#1}%
-}
-\sa@convertoption{gif}[]{%
-    \setkeys{standalone.cls/convert}{true,outext={.gif}}%
-}
-\sa@clsoption{gif}[]{%
-    \setkeys{standalone.cls/convert}{gif,#1}%
-}
-\sa@convertoption{onfailure}{%
-    \begingroup
-    \edef\@tempa{#1}%
-    \def\@tempb{error}%
-    \ifx\@tempa\@tempb
-        \endgroup
-        \let\sa@convert@failuremsg\ClassError
-    \else
-    \def\@tempb{warning}%
-    \ifx\@tempa\@tempb
-        \endgroup
-        \let\sa@convert@failuremsg\ClassWarning
-    \else
-    \def\@tempb{info}%
-    \ifx\@tempa\@tempb
-        \endgroup
-        \let\sa@convert@failuremsg\ClassInfo
-    \else
-    \def\@tempb{ignore}%
-    \ifx\@tempa\@tempb
-        \endgroup
-        \def\sa@convert@failuremsg##1##2##3{}%
-        \let\sa@convert@notfoundmsg\@gobbletwo
-    \else
-        \let\on@line\@empty
-        \ClassError{standalone}{Invalid value '\@tempa' for the 'onfailure' option.\MessageBreak
-                                Valid values: 'error', 'warning', 'info', 'ignore'}{}%
-        \endgroup
-    \fi\fi\fi\fi
-}
-\let\sa@convert@failuremsg\ClassWarning
-\let\sa@convert@notfoundmsg\ClassWarning
-\sa@convertoption{defgsdevice}{%
-    \sa@defgsdevice#1\relax\relax
-}
-\def\sa@defgsdevice#1#2{%
-    \@namedef{sa@gsdevice@#1}{#2}%
-}
-\@namedef{sa@gsdevice@.jpg}{jpeg}%
-\@namedef{sa@gsdevice@.png}{png16m}%
-\sa@convertoption{command}{%
-    \def\sa@convert@command{#1}%
-}
-\sa@convertoption{pdf2svg}[]{%
-    \def\sa@convert@command{pdf2svg \infile\space\outfile}%
-    \sa@convertvar{outext}{.svg}
-}
-\sa@convertoption{imagemagick}[]{%
-    \def\sa@convert@command{\convertexe\space -density \density\space \infile\space \ifx\size\empty\else -resize \size\fi\space -quality 90 \outfile}%
-    \let\sa@convert@pageoffset\m@ne
-}
-\sa@convertoption{ghostscript}[]{%
-    \def\sa@convert@command{\gsexe\space -dSAFER -dBATCH -dNOPAUSE -sDEVICE=\gsdevice\space -r\density\space -sOutputFile=\outfile\space \infile}%
-    \let\sa@convert@pageoffset\z@
-}
-\sa@convertvar{latexoptions}{ -shell-escape }
-\sa@convertvar{subjobname}{\jobname}
-\sa@convertvar{mainfile}{\jobname}
-\sa@convertvar{quote}{}
-\let\sa@convert@quote\relax
-\sa@convertvar{size}{}
-\sa@convertvar{inname}{\subjobname}
-\sa@convertvar{infile}{\inname\inext}
-\sa@convertvar{outext}{.png}
-\sa@convertvar{outname}{\inname}
-\sa@convertvar{outfile}{\outname\ifsa@multi\sa@multi@pagemark\fi\outext}
-\def\sa@multi@pagemark{-\percent0d}%
-\sa@convertvar{density}{300}
-\sa@convertvar{gsdevice}{%
-    \expandafter\ifx\csname sa@gsdevice@\outext\endcsname\relax
-        \expandafter\@gobble\outext
-    \else
-        \csname sa@gsdevice@\outext\endcsname
-    \fi
-}
-\ifluatex
-    \sa@convertvar{latex}{lualatex}
-    \sa@convertvar{inext}{.pdf}
-    \sa@convertvar{precommand}{}
-    \setkeys{standalone.cls/convert}{imagemagick}
-\else
-\ifpdf
-    \sa@convertvar{latex}{pdflatex}
-    \sa@convertvar{inext}{.pdf}
-    \sa@convertvar{precommand}{}
-    \setkeys{standalone.cls/convert}{imagemagick}
-\else
-\ifxetex
-    \sa@convertvar{latex}{xelatex}
-    \sa@convertvar{inext}{.pdf}
-    \sa@convertvar{precommand}{}
-    \setkeys{standalone.cls/convert}{imagemagick}
-\else
-    \sa@convertvar{latex}{latex}
-    \sa@convertvar{inext}{.ps}
-    \sa@convertvar{precommand}{dvips \jobname.dvi}
-    \setkeys{standalone.cls/convert}{ghostscript}
-\fi\fi\fi
-\begingroup
-\ifluatex
-  \csname @tempswa\directlua{
-      if os.type == "windows" then
-        tex.sprint("true")
-      else
-        tex.sprint("false")
-      end
-    }\endcsname
-\else
-    \IfFileExists{/dev/null}{\@tempswafalse}{\@tempswatrue}%
-\fi
-\if@tempswa
-    \endgroup
-    \sa@convertvar{convertexe}{imgconvert}
-    \sa@convertvar{gsexe}{gswin32c}
-\else
-    \endgroup
-    \sa@convertvar{convertexe}{convert}
-    \sa@convertvar{gsexe}{gs}
-\fi
-\newcommand*\standaloneenv[1]{%
-    \begingroup
-    \edef\@tempa{\endgroup\noexpand\@for\noexpand\@tempa:=\zap@space#1 \@empty}%
-    \@tempa\do{\expandafter\@standaloneenv\expandafter{\@tempa}}%
-    \setkeys{standalone.cls}{multi}%
-}
-\@onlypreamble\standaloneenv
-\newcommand*{\standaloneconfig}{\setkeys{standalone.cls}}
-\let\@standaloneenv\@gobble
-\newcount\sa@internal
-\newcounter{sapage}
-\let\standalone\empty
-\let\endstandalone\relax
-\def\sa@width{\linewidth}
-\InputIfFileExists{standalone.cfg}{}{}
-\begingroup
-\def\@tempa{\endgroup\setkeys*{standalone.cls}}
-\expandafter\expandafter\expandafter\@tempa
-\expandafter\expandafter\expandafter{\csname opt@standalone.cls\endcsname}
-\let\@classoptionslist\XKV@rm
-\disable@keys{standalone.cls}{crop,preview,class,beamer,ignorerest}
-\AtBeginDocument{%
-    \disable@keys{standalone.cls}{multi}%
-}
-\expandafter\expandafter\expandafter\LoadClass
-\expandafter\expandafter\expandafter[%
-\expandafter\@classoptionslist
-\expandafter]\expandafter{\sa@class}
-\ifsa@ignorerest
-    \def\sa@startignore{\sa@boxit}
-\else
-    \let\sa@startignore\relax
-\fi
-\ifsa@ignorerest
-    \def\sa@stopignore{\endsa@boxit}
-\else
-    \let\sa@stopignore\relax
-\fi
-\ifsa@multido
-\RequirePackage{multido}
-\let\sa@orig@multido@\multido@
-\renewcommand{\multido@}[6]{%
-  \sa@stopignore
-  \sa@orig@multido@{#1}{#2}{#3}{#4}{#5}{%
-    \sa@startignore
-    \begin{samultido}%
-      \let\multido@\sa@orig@multido@
-      #6%
-    \end{samultido}%
-    \sa@stopignore
-  }%
-  \sa@startignore
-}
-\fi
-\ifsa@convert
-\ifx\sa@convert@quote\relax
-\begingroup
-\@tempswafalse
-\expandafter\ifx\csname pdftexbanner\endcsname\relax
-    \@tempswatrue
-\else
-\def\MiKTeX{MiKTeX}
-\@onelevel@sanitize\MiKTeX
-\expandafter\def\expandafter\testmiktex\expandafter#\expandafter1\MiKTeX#2\relax{%
-        \ifx\empty#2\empty
-             \@tempswafalse
-        \else
-             \@tempswatrue
-        \fi
-}
-\expandafter\expandafter
-\expandafter\testmiktex\expandafter\pdftexbanner\MiKTeX\relax\relax
-
-\fi
-\expandafter
-\endgroup
-\if@tempswa
-\def\sa@convert@quote{"}
-\else
-\def\sa@convert@quote{'}
-\fi
-\fi
-\fi
-\ifsa@varwidth
-    \RequirePackage{varwidth}
-\fi
-\ifsa@tikz
-    \RequirePackage{tikz}
-\fi
-\ifsa@pstricks
-    \RequirePackage{pstricks}
-\fi
-\ifsa@preview
-\RequirePackage{preview}
-\ifsa@multi\else
-    \@ifundefined{endstandalone}{%
-        \renewenvironment{standalone}
-            {\preview\sa@varwidth}
-            {\sa@endvarwidth\endpreview}
-    }{}% TODO: Add info message?
-\fi
-\def\PreviewBbAdjust{-\sa@border@left\space -\sa@border@bottom\space \sa@border@right\space \sa@border@top}%
-\def\@standaloneenv#1{%
-    \expandafter\ifx\csname sa@orig@#1\endcsname\relax
-        \expandafter\let\csname sa@orig@#1\expandafter\endcsname\csname #1\endcsname
-        \expandafter\let\csname sa@orig@end#1\expandafter\endcsname\csname end#1\endcsname
-    \fi
-    \expandafter\def\csname #1\endcsname{%
-        \ifnum\sa@internal=0
-            \addtocounter{sapage}\@ne
-            \preview
-            \sa@varwidth
-        \fi
-        \advance\sa@internal\@ne
-        \csname sa@orig@#1\endcsname
-    }%
-    \expandafter\def\csname end#1\endcsname{%
-        \csname sa@orig@end#1\endcsname
-        \advance\sa@internal\m@ne
-        \ifnum\sa@internal=0
-            \sa@endvarwidth
-            \endpreview
-        \fi
-    }%
-}%
-\fi
-\ifsa@crop
-\newbox\sa@box
-\pagestyle{empty}
-\hoffset=-72.27pt
-\voffset=-72.27pt
-\topmargin=0pt
-\headheight=0pt
-\headsep=0pt
-\marginparsep=0pt
-\marginparwidth=0pt
-\footskip=0pt
-\marginparpush=0pt
-\oddsidemargin=0pt
-\evensidemargin=0pt
-\topskip=0pt
-\textheight=\maxdimen
-\def\sa@boxit{%
-    \setbox\sa@box\hbox\bgroup\color@setgroup\sa@varwidth
-}%
-\def\endsa@boxit{%
-    \sa@endvarwidth\color@endgroup\egroup
-}%
-\renewenvironment{standalone}{%
-    \ifsa@multi
-        \sa@startignore
-    \else
-        \sa@boxit
-    \fi
-}{%
-    \ifsa@multi
-        \sa@stopignore
-    \else
-        \endsa@boxit
-        \sa@handlebox
-    \fi
-}
-\ifsa@multi\else
-    \sa@ignorerestfalse
-\fi
-\ifsa@ignorerest
-    \def\@standaloneenv#1{%
-        \expandafter\ifx\csname sa@orig@#1\endcsname\relax
-            \expandafter\let\csname sa@orig@#1\expandafter\endcsname\csname #1\endcsname
-            \expandafter\let\csname sa@orig@end#1\expandafter\endcsname\csname end#1\endcsname
-        \fi
-        \expandafter\def\csname #1\endcsname{%
-            \ifnum\sa@internal=0
-                \addtocounter{sapage}\@ne
-                \edef\@tempa{\endgroup
-                    \noexpand\endsa@boxit
-                    \begingroup
-                    \def\noexpand\@currenvir{\@currenvir}%
-                    \def\noexpand\@currenvline{\@currenvline}%
-                }%
-                \@tempa
-                \sa@boxit
-            \fi
-            \advance\sa@internal\@ne
-            \csname sa@orig@#1\endcsname
-        }%
-        \expandafter\def\csname end#1\endcsname{%
-            \csname sa@orig@end#1\endcsname
-            \advance\sa@internal\m@ne
-            \ifnum\sa@internal=0
-                \endsa@boxit
-                \sa@handlebox
-                \aftergroup\sa@boxit
-            \fi
-        }%
-    }%
-\else
-    \def\@standaloneenv#1{%
-        \expandafter\ifx\csname sa@orig@#1\endcsname\relax
-            \expandafter\let\csname sa@orig@#1\expandafter\endcsname\csname #1\endcsname
-            \expandafter\let\csname sa@orig@end#1\expandafter\endcsname\csname end#1\endcsname
-        \fi
-        \expandafter\def\csname #1\endcsname{%
-            \ifnum\sa@internal=0
-                \addtocounter{sapage}\@ne
-                \sa@boxit
-            \fi
-            \advance\sa@internal\@ne
-            \csname sa@orig@#1\endcsname
-        }%
-        \expandafter\def\csname end#1\endcsname{%
-            \csname sa@orig@end#1\endcsname
-            \advance\sa@internal\m@ne
-            \ifnum\sa@internal=0
-                \endsa@boxit
-                \sa@handlebox
-            \fi
-        }%
-    }%
-\fi
-\def\sa@handlebox{%
-    \ifcase
-        0%
-        \ifsa@ignoreempty
-            \ifdim\wd\sa@box=\z@
-            \ifdim\ht\sa@box=\z@
-            \ifdim\dp\sa@box=\z@
-                1%
-            \fi\fi\fi
-        \fi
-    \relax
-    \sbox\sa@box{%
-        \hskip\sa@border@left
-        \@tempdima=\ht\sa@box
-        \advance\@tempdima\sa@border@top\relax
-        \ht\sa@box=\@tempdima
-        \@tempdima=\dp\sa@box
-        \advance\@tempdima\sa@border@bottom\relax
-        \dp\sa@box=\@tempdima
-        \raise\dp\sa@box
-            \box\sa@box
-        \hskip\sa@border@right
-    }%
-    \sa@placebox
-    \fi
-}
-\ifcase0%
-    \ifpdf\else\ifluatex\else\ifxetex\else 1\fi\fi\fi
-  \relax
-    \def\sa@placebox{%
-        \newpage
-        \global\pdfpagewidth=\wd\sa@box
-        \global\pdfpageheight=\ht\sa@box
-        \global\paperwidth=\wd\sa@box
-        \global\paperheight=\ht\sa@box
-        \global\hsize=\wd\sa@box
-        \global\vsize=\ht\sa@box
-        \global\@colht=\ht\sa@box
-        \global\@colroom=\ht\sa@box
-        \noindent\usebox\sa@box
-        \newpage
-    }
-  \else
-    \def\sa@placebox{%
-        \global\paperwidth=\wd\sa@box
-        \global\paperheight=\ht\sa@box
-        \global\@colht=\maxdimen
-        \global\@colroom=\maxdimen
-        \global\hsize=\maxdimen
-        \global\vsize=\maxdimen
-        \sa@papersize
-        \ifsa@multi
-        \begingroup
-        \@tempdima0.99626\paperwidth
-        \@tempdimb0.99626\paperheight
-        \edef\@tempc{\strip@pt\@tempdima}%
-        \edef\@tempd{\strip@pt\@tempdimb}%
-        \advance\@tempdima by .998pt
-        \advance\@tempdimb by .998pt
-        \def\strip@float##1.##2\relax{##1}%
-        \edef\@tempa{\expandafter\strip@float\the\@tempdima\relax}%
-        \edef\@tempb{\expandafter\strip@float\the\@tempdimb\relax}%
-        \special{ps::%
-            \@percentchar\@percentchar PageBoundingBox: 0 0 \@tempa\space\@tempb^^J%
-            \@percentchar\@percentchar HiResPageBoundingBox: 0 0 \@tempc\space\@tempd^^J%
-            \@percentchar\@percentchar BeginPageSetup^^J%
-            << /PageSize [\@tempc\space\@tempd]
-            >> setpagedevice^^J%<<
-            0 0 bop^^J%
-            \@percentchar\@percentchar EndPageSetup}%
-        \endgroup
-        \fi
-        \topskip=0pt
-        \noindent\sa@ps@content
-        \newpage
-    }
-\def\sa@ps@content{%
-    \noindent\usebox\sa@box
-    \global\def\sa@ps@content{%
-        \@tempdima\sa@yoffset
-        \advance\@tempdima-\topskip
-        \dp\sa@box\z@
-        \ht\sa@box\z@
-        \noindent\lower\@tempdima\copy\sa@box
-    }%
-}
-\def\sa@papersize{%
-    \global\let\sa@papersize\relax
-    \special{papersize=\the\paperwidth,\the\paperheight}%
-    \global\sa@yoffset=\paperheight
-    \special{ps::%
-        \@percentchar\@percentchar HiResBoundingBox: 0 0 \the\paperwidth\space\the\paperheight^^J%
-    }%
-}
-\newlength\sa@yoffset
-\fi
-\fi
-\ifstandalonebeamer
-\newenvironment{standaloneframe}{%
-  \@ifnextchar<%
-    {\@standaloneframe}%
-    {\@@standaloneframe{}}%
-}{\end{frame}}%
-\def\@standaloneframe<#1>{%
-    \@@standaloneframe{<#1>}%
-}
-\def\@@standaloneframe#1{%
-  \@ifnextchar[%]
-    {\@@@standaloneframe{#1}}%
-    {\@@@standaloneframe{#1}[]}%
-}%
-\def\@@@standaloneframe#1[{%
-  \@ifnextchar<%
-    {\@@@@standaloneframe{#1}[}%
-    {\@@@@@@standaloneframe{#1}[}%
-}%
-\def\@@@@standaloneframe#1[#2]{%
-  \@ifnextchar[%]
-    {\@@@@@standaloneframe{#1}{#2}}%
-    {\begin{frame}#1[#2][environment=standaloneframe]}%
-}%
-\def\@@@@@standaloneframe#1#2[#3]{%
-    \begin{frame}#1[#2][environment=standaloneframe,#3]%
-}%
-\def\@@@@@@standaloneframe#1[#2]{%
-    \begin{frame}#1[environment=standaloneframe,#2]%
-}%
-\fi
-\expandafter\ifx\csname sa@internal@run\endcsname\relax\else
-    \AtEndDocument{%
-        \immediate\write\@mainaux{\gdef\noexpand\sa@multi@numpages{\arabic{sapage}}}%
-    }
-    \sa@convertfalse
-\fi
-\ifsa@convert
-\let\sa@convert@stop\stop
-\begingroup
-\let\on@line\@gobble
-\def\sa@convert#1{%
-    \IfFileExists{\outfile}{%
-        \edef\filemodbefore{\csname pdffilemoddate\endcsname{\outfile}}%
-    }{%
-    \IfFileExists{\outname\outext}{%
-        \edef\filemodbefore{\csname pdffilemoddate\endcsname{\outname\outext}}%
-    }{%
-    \IfFileExists{\outname-0\outext}{%
-        \edef\filemodbefore{\csname pdffilemoddate\endcsname{\outname-0\outext}}%
-    }{%
-    \IfFileExists{\outname-1\outext}{%
-        \edef\filemodbefore{\csname pdffilemoddate\endcsname{\outname-1\outext}}%
-    }{%
-        \def\filemodbefore{}%
-    }}}}%
-    \edef\@tempa{\jobname}%
-    \edef\@tempb{\sa@convert@subjobname}%
-    \@onelevel@sanitize\@tempa
-    \@onelevel@sanitize\@tempb
-    \@tempswafalse
-    \ifx\@tempa\@tempb
-        \@tempswatrue
-        \edef\infile@filemodbefore{\csname pdffilemoddate\endcsname{\infile}}%
-    \else
-        \global\let\sa@convert@stop\relax
-    \fi
-    \immediate\write18{\sa@convert@latex\space\sa@convert@latexoptions\space
-        -jobname \sa@convert@quote\sa@convert@subjobname\sa@convert@quote\space
-        \sa@convert@quote\string\expandafter\string\def\string\csname\space
-        sa@internal@run\string\endcsname{1}\string\input{\sa@convert@mainfile}\sa@convert@quote}%
-    \begingroup
-    \gdef\sa@multi@numpages{1}%
-    \IfFileExists{\sa@convert@subjobname.aux}{%
-        \globaldefs=\m@ne
-        \@@input\sa@convert@subjobname.aux\relax
-        \globaldefs=\z@
-        \xdef\sa@multi@numpages{\sa@multi@numpages}%
-    }{}%
-    \endgroup
-    \setcounter{sapage}{\sa@multi@numpages}%
-    \addtocounter{sapage}\sa@convert@pageoffset
-    \ifnum\c@sapage=\z@
-        \def\sa@multi@pagemark{}%
-        \edef\sa@lastoutfile{\outfile}%
-    \else
-        \@tempcnta\z@
-        \loop\ifnum\value{sapage}>0
-            \advance\@tempcnta\@ne
-            \divide\c@sapage by 10\relax
-        \repeat
-        \edef\sa@multi@pagemark{-\percent0\the\@tempcnta d}%
-        \begingroup
-        \setcounter{sapage}{\sa@multi@numpages}%
-        \addtocounter{sapage}\sa@convert@pageoffset
-        \def\sa@multi@pagemark{-\arabic{sapage}}%
-        \xdef\sa@lastoutfile{\outfile}%
-        \endgroup
-    \fi
-    \if@tempswa
-        \edef\infile@filemodafter{\csname pdffilemoddate\endcsname{\infile}}%
-        \ifx\infile@filemodbefore\infile@filemodafter
-            \global\let\sa@convert@stop\relax
-        \fi
-    \fi
-    \edef\sa@convert@precommand{\sa@convert@precommand}%
-    \ifx\sa@convert@precommand\@empty\else
-        \immediate\write18{\sa@convert@precommand}%
-    \fi
-    \immediate\write18{\sa@convert@command}%
-    \@tempswafalse
-    \IfFileExists{\sa@lastoutfile}{%
-        \edef\filemodafter{\csname pdffilemoddate\endcsname{\sa@lastoutfile}}%
-        \ifx\filemodbefore\filemodafter
-            \expandafter\ifx\csname pdffilemoddate\endcsname\relax\else
-                \sa@convert@failuremsg{standalone}{#1}{}%
-            \fi
-        \else
-            \typeout{Class standalone:^^JOutput written on \sa@lastoutfile.}%
-        \fi
-    }{%
-        \sa@convert@failuremsg{standalone}{#1}{}%
-    }%
-}
-\let\subjobname\sa@convert@subjobname
-\let\mainfile\sa@convert@mainfile
-\let\infile\sa@convert@infile
-\let\inext\sa@convert@inext
-\let\inname\sa@convert@inname
-\let\gsdevice\sa@convert@gsdevice
-\let\convertexe\sa@convert@convertexe
-\let\gsexe\sa@convert@gsexe
-\let\density\sa@convert@density
-\let\size\sa@convert@size
-\let\outext\sa@convert@outext
-\let\outname\sa@convert@outname
-\let\outfile\sa@convert@outfile
-\let\percent\@percentchar
-\let\quote\sa@convert@quote
-\ifcase0%
-    \expandafter\ifx\csname pdfshellescape\endcsname\relax
-    \ifeof18 \else 3\fi
-    \else\the\pdfshellescape\fi
-\relax% 0
-    \sa@convert@failuremsg
-        {standalone}{Shell escape disabled! Cannot convert file '\infile'.}{}%
-    \global\let\sa@convert@stop\relax
-\or% 1
-    \sa@convert{Conversion unsuccessful!\MessageBreak
-                There might be something wrong with your\MessageBreak
-                conversation software or the file permissions!}%
-\else% 2 or 3
-    \sa@convert{Conversion failed! Please ensure that shell escape\MessageBreak is enabled (e.g. use '-shell-escape').}%
-\fi
-\endgroup
-\expandafter\sa@convert@stop
-\fi
-\begingroup
-\toks@\expandafter{%
-    \document
-    \sa@cls@afterbegindocument
-}
-\xdef\document{\the\toks@}%
-\toks@\expandafter{%
-    \expandafter
-    \sa@cls@beforeenddocument
-    \enddocument
-}
-\xdef\enddocument{\the\toks@}%
-\endgroup
-\def\sa@cls@afterbegindocument{\standalone\ignorespaces}
-\def\sa@cls@beforeenddocument{\ifhmode\unskip\fi\endstandalone}
-\endinput
-%%
-%% End of file `standalone.cls'.