% -*-tex-*-
% /u/macleod/tex/latex/citexp.sty
% from the CITE.STY file .2, 10-May-89 10:51:16, Edit by BEEBE
%
% TeXhax Digest    Friday,  April 21, 1989, Volume 89 : Issue 37
%
% Date: Fri, 14 Apr 89 21:59:44 PDT
% From: Donald_Arseneau@mtsg.ubc.ca
% Subject: Re: Line breaking within a citation
% Keywords: LaTeX, citations
%
% Here is my style file for numeric citations.  Not only
% does it allow line breaks, but it shortens long lists
% of citations to make those breaks unnecessary:
%
% - - - - - - CITEXP.STY - - - - - -
%
%              Replacement for \@citex
%
%     Allow, but strongly discourage, line breaks within a long
%     series of citations.  Compress lists of successive numbers
%     to one number range, e.g., 5,6,7,8,9 --> 5--9.  Compatible
%     with versions of \@cite that use exponents.
%              -- Donald Arseneau  1989
%
\def\@citex[#1]#2{%
\if@filesw \immediate \write \@auxout {\string \citation {#2}}\fi
\@tempcntb\m@ne \let\@h@ld\relax \def\@citea{}%
\@cite{%
  \@for \@citeb:=#2\do {%
    \@ifundefined {b@\@citeb}%
      {\@h@ld\@citea\@tempcntb\m@ne{\bf ?}%
      \@warning {Citation `\@citeb ' on page \thepage \space undefined}}%
%   else
      {\@tempcnta\@tempcntb \advance\@tempcnta\@ne
      \@tempcntb\number\csname b@\@citeb \endcsname \relax
      \ifnum\@tempcnta=\@tempcntb %   Number follows previous--hold on to it
        \ifx\@h@ld\relax
%         % first pair of successives
          \edef \@h@ld{\@citea\csname b@\@citeb\endcsname}%
        \else
%         % compressible list of successives
          \edef\@h@ld{\ifmmode{-}\else--\fi\csname b@\@citeb\endcsname}
        \fi
      \else   %  non-successor--dump what's held and do this one
        \@h@ld\@citea\csname b@\@citeb \endcsname
        \let\@h@ld\relax
      \fi}%
    \def\@citea{,\penalty\@highpenalty\,}%
  }\@h@ld
}{#1}}
%
%
%    Example of alternate \@cite macro using exponents:
%
\def\@cite#1#2{{$^{#1}$\if@tempswa , #2\fi }}