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%D \module
%D [ file=spec-dvi,
%D version=1996.01.25,
%D title=\CONTEXT\ Special Macros,
%D subtitle=Generic \TEX\ Solutions,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA / Hans Hagen \& Ton Otten}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. Non||commercial use is
%C granted.
\unprotect
%D \macros
%D {dostartobject,
%D dostopobject,
%D doinsertobject}
%D {}
%D
%D Reuse of object is not supported by the \DVI\ format. We
%D therefore just duplicate them using boxes.
\startspecials[tex]
\newbox\DVIobjects \newcounter\DVIobjectcounter
\definespecial\dostartobject#1#2#3#4#5%
{\setbox\nextbox=\vbox\bgroup
\def\dodostopobject%
{\egroup
\doglobal\increment\DVIobjectcounter
\global\setbox\DVIobjects=\vbox
{\offinterlineskip
\forgetall
\unvbox\DVIobjects
\setbox\nextbox=\hbox{\box\nextbox}
\wd\nextbox=\!!zeropoint
\dp\nextbox=\!!zeropoint
\ht\nextbox=\!!onepoint
\allowbreak
\box\nextbox}%
\dosetobjectreference{#1}{#2}{\DVIobjectcounter}}}
\definespecial\dostopobject%
{\dodostopobject}
\definespecial\doinsertobject#1#2%
{\bgroup
\dogetobjectreference{#1}{#2}\DVIobjectreference
\splittopskip\!!zeropoint
\setbox0=\copy\DVIobjects
\dimen0=\DVIobjectreference pt
\advance\dimen0 by -\!!onepoint
\setbox2=\vsplit0 to \dimen0
\ifdim\ht0>\!!onepoint
\setbox0=\vsplit0 to \!!onepoint
\fi
\unvbox0\setbox0=\lastbox\unhbox0
\egroup}
\stopspecials
\protect
\endinput
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