%% hypernat.sty v1.0b (C) 2001 Jens Berger
%%
%%  This packages makes the hyperref package and the natbib package
%%  with options `numbers' and `sort&compress' work together. This
%%  means, that the citations (e.g [3,2,1]) will be compressed to
%%  [1-3], where the `1' and the `3' are (color-)linked to the
%%  bibliography.
%%
%%  The changes I made here are suggested (in August 2000) for the
%%  next natbib release.
%%
%%  This package will disappear from CTAN, when natbib will do
%%  the job by himself.
%%
%%  Load this package after natbib and hyperref!
%%
%%  Please make sure that you are using at least natbib v7.0!
%%
%% Changes
%%
%%   v1.0b 2001/07/09 anchor for all citations in the list added 
%%                    to make backref options working (bug reported by Günter Keusen)
%%   v1.0a 2001/01/22 \noexpand for some \hyper@natlinkend added 
%%                    (bug reported by Frank Meißen), hypernat.sty 
%%                    is working now for `dvips --> ps2pdf' or `dvips -> Distiller'
%%
\ProvidesPackage{hypernat}[2001/07/09 v1.0b hyperref and natbib compatibility (jb)]
\AtBeginDocument{\def\NAT@sort{2}}
\def\NAT@citexnum[#1][#2]#3{%
  \NAT@sort@cites{#3}%
  \let\@citea\@empty
   \@cite{\def\NAT@num{-1}\let\NAT@last@yr\relax\let\NAT@nm\@empty
    \@for\@citeb:=\NAT@cite@list\do
    {\edef\@citeb{\expandafter\@firstofone\@citeb}%
     \if@filesw\immediate\write\@auxout{\string\citation{\@citeb}}\fi
     \@ifundefined{b@\@citeb\@extra@b@citeb}{%
       {\reset@font\bfseries?}
        \NAT@citeundefined\PackageWarning{natbib}%
       {Citation `\@citeb' on page \thepage \space undefined}}%
     {\let\NAT@last@num\NAT@num\let\NAT@last@nm\NAT@nm
      \NAT@parse{\@citeb}%
      \ifNAT@longnames\@ifundefined{bv@\@citeb\@extra@b@citeb}{%
        \let\NAT@name=\NAT@all@names
        \global\@namedef{bv@\@citeb\@extra@b@citeb}{}}{}%
      \fi
      \ifNAT@full\let\NAT@nm\NAT@all@names\else
        \let\NAT@nm\NAT@name\fi
      \ifNAT@swa
       \ifnum\NAT@ctype>1\relax\@citea
        \hyper@natlinkstart{\@citeb\@extra@b@citeb}%
            \ifnum\NAT@ctype=2\relax\NAT@test{\NAT@ctype}%
            \else\NAT@alias
            \fi\hyper@natlinkend\else
       \ifnum\NAT@sort>1
         \begingroup\catcode`\_=8
            \ifcat _\ifnum\z@<0\NAT@num _\else A\fi
              \global\let\NAT@nm=\NAT@num \else \gdef\NAT@nm{-2}\fi
            \ifcat _\ifnum\z@<0\NAT@last@num _\else A\fi
              \global\@tempcnta=\NAT@last@num \global\advance\@tempcnta by\@ne
              \else \global\@tempcnta\m@ne\fi
         \endgroup
% v0.1b anchor added to make backref's working, watch for errors!
         \ifnum\NAT@nm=\@tempcnta
         \ifHy@backref\hyper@natlinkstart{\@citeb\@extra@b@citeb}\hyper@natlinkend\fi
           \ifx\NAT@last@yr\relax
%             \edef\NAT@last@yr{\@citea \mbox{\noexpand\citenumfont{\NAT@num}}}%
            %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
               \edef\NAT@last@yr{\@citea \mbox{\noexpand%
                    \hyper@natlinkstart{\@citeb\@extra@b@citeb}%
                      \noexpand\citenumfont{\NAT@num}%
                    \noexpand\hyper@natlinkend}%
               }%
            %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
           \else
%             \edef\NAT@last@yr{--\penalty\@m\mbox{\noexpand\citenumfont{\NAT@num}}}%
            %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
             \edef\NAT@last@yr{--\penalty\@m\mbox{\noexpand%
                  \hyper@natlinkstart{\@citeb\@extra@b@citeb}%
                    \noexpand\citenumfont{\NAT@num}%
                  \noexpand\hyper@natlinkend}%
             }%
            %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
           \fi
         \else
%           \NAT@last@yr \@citea \mbox{\citenumfont{\NAT@num}}%
           %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
           \NAT@last@yr \@citea \mbox{%
                \hyper@natlinkstart{\@citeb\@extra@b@citeb}%
                    \citenumfont{\NAT@num}%
                \hyper@natlinkend}%
           %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
           \let\NAT@last@yr\relax
         \fi
       \else
         \@citea \mbox{\hyper@natlinkstart{\@citeb\@extra@b@citeb}%
           {\citenumfont{\NAT@num}}\hyper@natlinkend}%
       \fi
       \fi
       \def\@citea{\NAT@sep\penalty\@m\NAT@space}%
      \else
        \ifcase\NAT@ctype\relax
          \ifx\NAT@last@nm\NAT@nm \NAT@yrsep\penalty\@m\NAT@space\else
          \@citea \NAT@test{1}\ \NAT@@open
          \if*#1*\else#1\ \fi\fi \NAT@mbox{%
          \hyper@natlinkstart{\@citeb\@extra@b@citeb}%
          {\citenumfont{\NAT@num}}\hyper@natlinkend}%
          \def\@citea{\NAT@@close\NAT@sep\penalty\@m\ }%
        \or\@citea
          \hyper@natlinkstart{\@citeb\@extra@b@citeb}%
           \NAT@test{\NAT@ctype}\hyper@natlinkend
          \def\@citea{\NAT@sep\penalty\@m\ }%
        \or\@citea
          \hyper@natlinkstart{\@citeb\@extra@b@citeb}%
           \NAT@test{\NAT@ctype}\hyper@natlinkend
          \def\@citea{\NAT@sep\penalty\@m\ }%
        \or\@citea
          \hyper@natlinkstart{\@citeb\@extra@b@citeb}%
           \NAT@alias\hyper@natlinkend
          \def\@citea{\NAT@sep\penalty\@m\ }%
        \fi
      \fi
      }}%
      \ifnum\NAT@sort>1\relax\NAT@last@yr\fi
      \ifNAT@swa\else\ifnum\NAT@ctype=0\if*#2*\else
      \NAT@cmt#2\fi \NAT@@close\fi\fi}{#1}{#2}%
}
\endinput