emacs/code/elpa/auctex-13.2.1/latex/preview.sty

%%
%% 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:https://www.gnu.org/software/auctex/>.
\NeedsTeXFormat{LaTeX2e}
\def\pr@version{13.2}
\def\pr@date{2023/01/17}
\ProvidesPackage{preview}[\pr@date\space \pr@version\space (AUCTeX/preview-latex)]
\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:https://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
}
\def\pr@@shipout{\deadcycles\z@\bgroup\setbox\z@\box\voidb@x
  \afterassignment\pr@shipoutegroup\setbox\z@}
\def\pr@shipoutegroup{\ifvoid\z@ \expandafter\aftergroup\fi \egroup}
\ifx\shipout\@undefined
  \begingroup
  \catcode`\:=10
  \catcode`\_=10
  \ifx\tex_shipout:D\@undefined
    \PackageError{preview}{Cannot find \protect\shipout\space primitive}%
    {preview needs to replace the \protect\shipout\space primitive with
      its own routine to do its work.  Due to packages or formats
      interfering, it cannot be identified.  Please report this.}
  \else
    \global\let\pr@shipout=\tex_shipout:D
    \global\let\tex_shipout:D=\pr@@shipout
  \fi
  \endgroup
\else
  \let\pr@shipout=\shipout
  \let\shipout=\pr@@shipout
\fi
\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'.