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% backref.4ht (2021-12-20-13:57), generated from tex4ht-4ht.tex
% Copyright 2021 TeX Users Group
%
% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either
% version 1.3c 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 1.3c 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 the TeX4ht Project <http://tug.org/tex4ht>.
%
% If you modify this program, changing the
% version identification would be appreciated.
\immediate\write-1{version 2021-12-20-13:57}
% patch command that inserts backlink destinations
\pend:defI\Hy@backout{%
% prevent duplicate backlink on the same page
\ifcsname bk##1\thepage\endcsname\else%
% insert link to the page
\html:addr\Link-{}{x\last:haddr}\EndLink%
% save link to the .xref file
\Tag{)Q##1\thepage}{x\last:haddr}%
% we need to save the link destination in .xref file
% too, otherwise \Link command would issue warning
\Tag{)Qx\last:haddr}{\FileNumber}%
\fi%
% declare this backlink destination as used, so we don't
% declare another one with the same name
\expandafter\def\csname bk##1\thepage\endcsname{}%
}
% redefine macro that puts out backlinks
\def\:tempa#1#2#3{%
% test if we saved link to the current bibitem and page
\ifTag{)Q\current:back:desc#1}{%
\Link{\LikeRef{)Q\current:back:desc#1}}{}#1\EndLink%
}%
{#1}% print just page number if there is no saved link
}%
\HLet\backrefxxx\:tempa
% save current bibkey for use in \backrefxxx
\pend:defI\BR@backref{\def\current:back:desc{##1}}
\Hinput{backref}
\endinput
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