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% This is a mess.
\def\ptx@label{}%
\def\label#1{%
  \ifcs{ptx@label_user:#1}
    {\ptx@error{Label `#1' already exists. Find another one}}
    {\global\letcs{ptx@label_user:#1}\relax
     \ptx@label_write{ptx@ref_user:#1}\ptx@label
     \ptx@label_write{ptx@ref_chapter:#1}{\usevalue chapter : internalcount }%
     \ptx@label_write{ptx@ref_section:#1}{\usevalue section : beforenumber \usevalue section : internalcount }%
     \ptx@label_write{ptx@ref_subsection:#1}{\usevalue subsection : beforenumber \usevalue subsection : internalcount }%
     \ptx@label_write{ptx@ref_paragraph:#1}{\usevalue paragraph : beforenumber \usevalue paragraph : internalcount }%
     \iffootnote
       \ptx@label_write{ptx@ref_footnote:#1}{\the\ptx@footnote_count}%
     \fi
     \ptx@write_toaux*{\defcs{ptx@ref_page:#1}{\the\pageno}}}%
  }
\def\ptx@label_with#1[#2]{%
  \def\ptx@label{#1}%
  \label{#2}%
  \ignorespaces
  }
\def\ptx@label_and#1[#2]{%
  \label{#2}%
  #1%
  }
\def\ptx@label_withand#1#2[#3]{%
  \ptx@label_with#1[#3]%
  #2%
  }
\newif\ifptx@rerun
\def\ptx@rerun{%
  \unless\ifptx@rerun
    \global\ptx@reruntrue
    \ptx@warn{You need a rerun.}%
  \fi
  }
\def\ptx@label_write#1#2{%
  \unless\ifptx@rerun
    \edef\ptx@temp{#2}%
    \ifcs{#1}
      {\passexpanded{\passexpandedcs{\reverse\iffstring}{#1}}\ptx@temp\ptx@rerun}
      {\ptx@rerun}%
  \fi
  \ptx@write_toaux{\defcs{#1}{#2}}%
  }



\def\ref{%
  \ifnextnospace[
    {\ptx@ref_getpre}
    {\ptx@ref_getpre[]}%
  }
\def\ptx@ref_getpre[#1]{%
  \ifnextnospace[
    {\ptx@ref_getpost{#1}}
    {\ptx@ref_getpost{#1}[]}%
  }
\def\ptx@ref_getpost#1[#2]#3#{%
  \passtrim{#3}{\ptx@ref_do{#1}{#2}}%
  }
\def\ptx@ref_do#1#2#3#4{%
  \ifcs{ptx@ref_user:#4}
    {\ifemptystring{#3}
      {\ptx@ref_typeset{\usecs{ptx@ref_user:#4}}}
      {\ifstring{#3}{page}\ptx@refpage_typeset\ptx@ref_typeset{\usecs{ptx@ref_#3:#4}}}
      {#1}{#2}}
    {??\ptx@rerun}%
  }
\protected\def\ptx@ref_typeset#1#2#3{#2#1#3}
\newcount\ptx@ref_pagerefcount
\protected\def\ptx@refpage_typeset#1#2#3{%
  \global\advance\ptx@ref_pagerefcount1
  \ifcs{ptx@pageref_number:\the\ptx@ref_pagerefcount}
    {\unless\ifnum\usecs{ptx@pageref_number:\the\ptx@ref_pagerefcount}=#1\relax
       #2#1#3%
      \fi}
    {??\ptx@rerun}%
  \expandafter\ptx@pageref_write\expandafter{\the\ptx@ref_pagerefcount}%
  }
\def\ptx@pageref_write#1{%
  \ptx@write_toaux*{\defcs{ptx@pageref_number:#1}{\the\pageno}}%
  }

\let\xref\ref
\def\sref{\unskip\ref[ section~][] section}
\def\Sref{\unskip\ref[ section~][] subsection}
\def\cref{\unskip\ref[ chapitre~][] chapter}
\def\pref{\unskip\ref[ (p.~][)] page}
\def\Pref{\unskip\ref[ p.~][] page}
\def\fref{\unskip\ref[ figure~][]}
\def\Fref#1{\fref{#1}\pref{#1}}
\def\tref{\unskip\ref[ tableau~][]}
\def\Tref#1{\tref{#1}\pref{#1}}
\def\fnref{\unskip\ref[ note~][] footnote}
\def\FNref#1{\fnref{#1}\pref{#1}}
\def\multiref#1"#2"{%
  \passtrim{#1}{\ptx@multiref_loop{first}{#2}}%
  }
\def\ptx@multiref#1#2#3{%
  \ptx@multiref_loop{#2}{#3}{#1}%
  }
\newfor\ptx@multiref_loop{2}#3{%
  \reverse\iffstring{#1}{first}{, }%
  \usecs{#3ref}{#2}%
  \passarguments{}{#2}
  }