tlb-mathcallbacks-001.lvt

\input{test2e}
\documentclass{minimal}
\begin{document}
\START
\ifx\directlua\undefined\END\expandafter\stop\fi
\directlua{
  luatexbase.add_to_callback('pre_mlist_to_hlist_filter', function(mlist)
    texio.write_nl'pre_mlist_to_hlist_filter called'
    return mlist
  end, 'test')
}
\[ 1 \]
\directlua{
  luatexbase.add_to_callback('mlist_to_hlist', function(...)
    texio.write_nl'mlist_to_hlist called'
    return node.mlist_to_hlist(...)
  end, 'test')
}%
\[ 1 \]%
\directlua{
  luatexbase.remove_from_callback('mlist_to_hlist', 'test')
}
\[ 1 \]
\directlua{
  luatexbase.add_to_callback('mlist_to_hlist', function(...)
    texio.write_nl'new mlist_to_hlist called'
    return node.mlist_to_hlist(...)
  end, 'test')
}%
\[ 1 \]
\END
\end{document}