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+%D \module
+%D   [       file=tabl-tsp,
+%D        version=2000.10.20,
+%D          title=\CONTEXT\ Table Macros,
+%D       subtitle=Splitting,
+%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. See mreadme.pdf for
+%C details.
+
+\writestatus{loading}{ConTeXt Table Macros / Splitting}
+
+%D The code in this file is move here from other places.
+
+\unprotect
+
+% only to be used with single tokens (will be prim)
+
+\ifx\htdp\undefined \def\htdp#1{\dimexpr\ht#1+\dp#1\relax} \fi
+
+%D Although the name resembles floats, and therefore this should be
+%D a page module, we decided to make it core functionality because the
+%D table code depends on it. Othrwise there would be too much
+%D overloading afterwards involved. Actually, the float part is rather
+%D generic and not that related to floats.
+
+% \splitfloat [settings] {\placetable[optional args]{test}} {content}
+
+\definenumber
+  [\??si]
+  [\c!way=\v!by\v!text,
+   \c!conversion=\@@siconversion]
+
+\def\setupfloatsplitting
+  {\dodoubleargument\getparameters[\??si]}
+
+\newif\ifinsidesplitfloat % will become chardef
+
+\newtoks \everysplitfloatsetup
+
+\def\splitfloat
+  {\dosingleempty\dosplitfloat}
+
+\ifx\floatcaptionsuffix\undefined \else
+  \let\floatcaptionsuffix\empty % will become \splitfloatcaptionsuffix
+\fi
+
+\def\extrasplitfloatlines{0}
+
+\def\dosplitfloat[#1]#2% nog dubbele refs
+  {\bgroup
+   \global\setfalse\splitfloatdone
+   \aftergroup\checksplitfloat
+   \insidefloattrue
+   \insidesplitfloattrue
+   \getparameters[\??si][#1]%
+   \resetnumber[\??si]%
+   \def\floatcaptionsuffix{\convertednumber[\??si]}%
+   \let\extrasplitfloatlines\@@silines
+   \the\everysplitfloatsetup
+   \def\splitfloatcommand{#2}%
+   \global\settrue \onlyonesplitofffloat
+   \global\setfalse\somenextplitofffloat
+   \dopushsavedfloats
+   \@@sibefore
+   \let\next} % \bgroup
+
+\def\checksplitfloat
+  {\ifconditional\splitfloatdone\else
+      \blank{\tttf \getmessage\m!floatblocks{13}\empty}\blank
+      \showmessage\m!floatblocks{13}\empty
+   \fi}
+
+\settrue \onlyonesplitofffloat
+\setfalse\somenextplitofffloat
+
+%D When \type {inbetween} is made empty instead of the
+%D default \type {\page}, we will get delayed flushing
+%D and text may continue below the graphic.
+%D
+%D \starttyping
+%D \dorecurse{2}{\input tufte }
+%D
+%D \splitfloat[lines=auto,inbetween=]
+%D   {\placetable{\dorecurse{5}{test\recurselevel\endgraf}}}
+%D   {\bTABLE[split=yes]
+%D    \bTR \bTD 11 \eTD \bTD \input tufte \eTD \eTR
+%D    \bTR \bTD 12 \eTD \bTD \input zapf \eTD \eTR
+%D    \bTR \bTD 13 \eTD \bTD \input bryson \eTD \eTR
+%D    \bTR \bTD 14 \eTD \bTD test  \eTD \eTR
+%D    \bTR \bTD 21 \eTD \bTD \input tufte \eTD \eTR
+%D    \bTR \bTD 22 \eTD \bTD \input zapf \eTD \eTR
+%D    \bTR \bTD 23 \eTD \bTD \input bryson \eTD \eTR
+%D    \bTR \bTD 24 \eTD \bTD test  \eTD \eTR
+%D    \bTR \bTD 31 \eTD \bTD \input tufte \eTD \eTR
+%D    \bTR \bTD 32 \eTD \bTD \input zapf \eTD \eTR
+%D    \bTR \bTD 33 \eTD \bTD \input bryson \eTD \eTR
+%D    \bTR \bTD 34 \eTD \bTD test  \eTD \eTR
+%D    \eTABLE}
+%D
+%D \dorecurse{10}{\input tufte }
+%D \stoptyping
+
+\newconditional\splitfloatdone
+
+\def\dodowithsplitofffloat
+  {\dowithnextbox
+     {\forgetall
+      \dontcomplain
+      \global\settrue\splitfloatdone
+      \chardef\nodelocationmode\zerocount % bypass auto-renumbering
+      \incrementnumber[\??si]%
+      \ifcase\rawnumber[\??si]\or \ifconditional\onlyonesplitofffloat
+        \let\floatcaptionsuffix\empty
+      \fi \fi
+      \bgroup
+      \ifconditional\somenextplitofffloat
+        \settrue\retainfloatnumber
+\notesenabledfalse % best here, experimental, brrr; test with note in caption
+      \else
+        \setfalse\retainfloatnumber
+      \fi
+      \splitfloatcommand{\box\nextbox}%
+      \egroup
+      \ifconditional\somenextplitofffloat
+        \doifelsenothing\@@siinbetween
+          {\ifconditional\splitfloatfirstdone\else\page\fi}
+          \@@siinbetween
+      \else
+        \@@siafter
+        \dopopsavedfloats
+        \doflushsavedfloats
+      \fi
+      \global\settrue\splitfloatfirstdone}%
+   \vbox}
+
+\def\nodowithsplitofffloat
+  {\dowithnextbox
+     {\forgetall
+      \dontcomplain
+      \box\nextbox % maybe an option to unvbox
+      \global\settrue\splitfloatfirstdone}%
+   \vbox}
+
+\def\dochecksplitofffloat#1% box
+  {\ifinsidesplitfloat
+     \ifdim\ht#1=\zeropoint
+       \global\setfalse\somenextplitofffloat
+     \else
+       \global\settrue \somenextplitofffloat
+       \global\setfalse\onlyonesplitofffloat
+     \fi
+   \fi}
+
+\def\analyzesplitfloatcaption#1% depends on page-flt
+  {\doif\extrasplitfloatlines\v!auto
+     {\bgroup
+      \settrue\retainfloatnumber
+      \chardef\nodelocationmode\zerocount
+      \forcelocalfloats
+      \setuplocalfloats[\c!before=,\c!after=,\c!inbetween=]%
+      \splitfloatcommand{\hbox to \wd#1{\strut}}% dummy line
+      \setbox\scratchbox\vbox{\flushlocalfloats}%
+      \getnoflines{\ht\scratchbox}%
+      \resetlocalfloats
+      \advance\noflines\minusone % compensate dummy line
+      \expanded{\egroup\noexpand\edef\noexpand\extrasplitfloatlines{\the\noflines}}}}
+
+% \def\analyzesplitfloatcaption#1%
+%   {\edef\extrasplitfloatlines{11}}
+
+\def\dowithsplitofffloat % nextbox
+  {\ifinsidesplitfloat
+     \expandafter\dodowithsplitofffloat
+   \else
+     \expandafter\nodowithsplitofffloat
+   \fi}
+
+\def\doifnotinsidesplitfloat
+  {\ifinsidesplitfloat\expandafter\gobbleoneargument\fi}
+
+%D Some defaults:
+
+\setupfloatsplitting
+  [\c!conversion=\v!character, % \v!romannumerals
+   \c!lines=3,
+   \c!before=,
+   \c!inbetween=\page,
+   \c!after=]
+
+%D Table splitter, on top of previous code:
+
+\newbox\tsplitcontent
+\newbox\tsplitresult
+\newbox\tsplithead
+\newbox\tsplitnext
+\newbox\tsplittail
+
+\def\resettsplit{% only \def's starting a a new line are seen by the dep checker
+   \def\tsplitminimumfreelines{0}%
+   \def\tsplitminimumfreespace{0pt}%
+   \setbox\tsplitcontent  \vbox{}%
+   \setbox\tsplitresult   \vbox{}%
+   \setbox\tsplithead     \vbox{}%
+   \setbox\tsplitnext     \vbox{}%
+   \setbox\tsplittail     \vbox{}%
+   \let\tsplitbeforeresult\donothing
+   \let\tsplitafterresult \donothing
+   \let\tsplitinbetween   \donothing
+   \let\tsplitbefore      \donothing
+   \let\tsplitafter       \donothing
+   \let\postprocesstsplit \donothing
+}
+
+\resettsplit
+
+% todo: keep tail to rest, so we need a lookahead
+
+\newconditional\splitfloatfirstdone
+
+\def\handletsplit
+  {\analyzesplitfloatcaption\tsplitcontent
+   \global\setfalse\splitfloatfirstdone
+   \testpagesync % new, sync, but still tricky
+     [\tsplitminimumfreelines]
+     [\dimexpr\tsplitminimumfreespace+\extrasplitfloatlines\lineheight\relax]%
+   \setbox\scratchbox\vbox{\tsplitinbetween}%
+   \edef\tsplitinbetweenheight{\the\htdp\scratchbox}% etex
+   \!!doneafalse
+   \doloop
+     {\ifinsidecolumns
+        % brrr, assumes empty columns
+        \global\setfalse\splitfloatfirstdone
+        \scratchdimen\textheight
+        \!!donectrue
+      \else
+        \ifconditional\splitfloatfirstdone
+          \scratchdimen\textheight
+          \!!donectrue
+        \else\ifdim\pagegoal<\maxdimen
+          \scratchdimen\dimexpr\pagegoal-\pagetotal\relax
+          \!!donecfalse
+        \else
+          \scratchdimen\textheight
+          \!!donectrue
+        \fi\fi
+      \fi
+      \scratchdimen\dimexpr\scratchdimen-\tsplitinbetweenheight-\tsplitminimumfreespace-\extrasplitfloatlines\lineheight\relax
+      \ifdim\htdp\tsplittail>\zeropoint
+        \advance\scratchdimen-\htdp\tsplittail
+      \fi
+      \setbox\tsplitresult\vbox
+        {\ifdim\ht\tsplithead>\zeropoint
+           \unvcopy\tsplithead
+           \tsplitinbetween
+         \fi}%
+      \if!!donea\else\ifdim\ht\tsplitnext>\zeropoint
+        \setbox\tsplithead\box\tsplitnext
+      \fi\fi
+      \!!doneatrue
+      \ifdim\ht\tsplitresult>\zeropoint
+        \!!donedtrue  % table head
+      \else
+        \!!donedfalse % no tablehead
+      \fi
+      \splittopskip\zeropoint
+      \doloop
+        {\setbox\scratchbox\vsplit\tsplitcontent to \onepoint % \lineheight
+         \setbox\scratchbox\vbox{\unvbox\scratchbox}%
+         \ifdim\dimexpr\scratchdimen-\htdp\scratchbox-\htdp\tsplitresult\relax>\zeropoint
+           \setbox\tsplitresult\vbox
+             {\unvbox\tsplitresult
+              \tsplitinbetween
+              \unvbox\scratchbox}%
+           \ifvoid\tsplitcontent \exitloop \fi
+         \else\if!!doned
+           % we only have a tablehead so far
+           \setbox\tsplitresult\vbox{\unvbox\tsplitresult\unvbox\scratchbox}%
+           \exitloop
+         \else\if!!donec
+           % we have text height available, but the (one) cell is too
+           % large to fit, so, in order to avoid loops/deadcycles we do:
+           \setbox\tsplitresult\vbox
+             {\unvbox\tsplitresult
+              \tsplitinbetween
+              \unvbox\scratchbox}%
+           \exitloop
+         \else
+           \setbox\tsplitcontent\vbox
+             {\unvbox\scratchbox
+              \tsplitinbetween
+              \ifvoid\tsplitcontent\else\unvbox\tsplitcontent\fi}%
+           \exitloop
+         \fi\fi\fi
+         \!!donedfalse
+         \!!donecfalse}%
+      \postprocesstsplit
+      \dochecksplitofffloat\tsplitcontent
+      \ifvoid\tsplitcontent
+        \setbox\tsplitresult\vbox
+          {\unvbox\tsplitresult
+           \tsplitinbetween
+           \unvcopy\tsplittail}%
+        \dowithsplitofffloat{\tsplitbeforeresult\box\tsplitresult\tsplitafterresult}%
+        \doifnotinsidesplitfloat\tsplitafter
+        \endgraf
+        \exitloop
+      \else
+        % hack
+        \ifdim\pagegoal<\maxdimen
+          \global\pagegoal\dimexpr\pagegoal+\lineheight\relax % etex
+        \fi
+        % brrr
+        \ifdim\ht\tsplitresult>\zeropoint
+          \setbox\tsplitresult\vbox
+            {\unvbox\tsplitresult
+             \tsplitinbetween
+             \unvcopy\tsplittail}%
+          \dowithsplitofffloat{\tsplitbeforeresult\box\tsplitresult\tsplitafterresult}%
+          \doifnotinsidesplitfloat\tsplitafter
+          \endgraf
+        \fi
+        \ifinsidecolumns
+          \doifnotinsidesplitfloat\goodbreak
+        \else
+          \doifnotinsidesplitfloat\page
+        \fi
+      \fi}%
+   \global\setfalse\splitfloatfirstdone} % we can use this one for tests
+
+\protect \endinput
+
+% test cases
+
+% \setupTABLE[split=repeat]
+%
+% \input tufte \endgraf
+% \splitfloat[lines=11]
+%   {\placetable{\dorecurse{10}{test\recurselevel\endgraf}}}
+%   {\bTABLE\dorecurse{100}{\bTR \bTD test \eTD \eTR}\eTABLE}
+% \input tufte \page
+%
+% \input tufte \endgraf
+% \splitfloat[lines=0]
+%   {}
+%   {\bTABLE\dorecurse{100}{\bTR \bTD test \eTD \eTR}\eTABLE}
+% \input tufte \endgraf \page
+%
+% \input tufte \endgraf
+% \bTABLE\dorecurse{100}{\bTR \bTD test \eTD \eTR}\eTABLE
+% \input tufte \page
+
+% \setuptabulate[split=yes]
+%
+% \input tufte \endgraf
+% \splitfloat[lines=11]
+%   {\placetable{\dorecurse{10}{test\recurselevel\endgraf}}}
+%   {\starttabulate\dorecurse{200}{\NC test \NC test \NC \NR}\stoptabulate}
+% \input tufte \page
+%
+% \input tufte \endgraf
+% \splitfloat[lines=0]
+%   {}
+%   {\starttabulate\dorecurse{200}{\NC test \NC test \NC \NR}\stoptabulate}
+% \input tufte \page
+%
+% \input tufte \endgraf
+% \starttabulate\dorecurse{200}{\NC test \NC test \NC \NR}\stoptabulate
+% \input tufte \page
+
+% \setuptables[split=yes]
+%
+% \newtoks\TestToks
+%
+% \TestToks\emptytoks
+% \appendtoks\starttablehead\to\TestToks
+% \dorecurse{3}{\appendtoks\VL head \VL head \VL \SR\to\TestToks}
+% \appendtoks\stoptablehead\to\TestToks
+% \appendtoks\starttabletail\to\TestToks
+% \dorecurse{3}{\appendtoks\VL tail \VL tail \VL \SR\to\TestToks}
+% \appendtoks\stoptabletail\to\TestToks
+% \appendtoks\starttables[|c|c|]\to\TestToks
+% \dorecurse{100}{\appendtoks\VL test \VL test \VL \SR\to\TestToks}
+% \appendtoks\stoptables\to\TestToks
+%
+% \input tufte \endgraf
+% \splitfloat[lines=auto] % [lines=11]
+%   {\placetable{\dorecurse{10}{test\recurselevel\endgraf}}}
+%   {\the\TestToks}
+% \input tufte \page
+%
+% \input tufte \endgraf
+% \splitfloat[lines=0]
+%   {}
+%   {\the\TestToks}
+% \input tufte \page
+%
+% \input tufte \endgraf
+% \the\TestToks
+% \input tufte \page
+%
+% multiple floats
+%
+% \starttext
+%   \dorecurse{3}{\input tufte } \endgraf
+%   \dorecurse{5}{\placefigure{}{\framed[height=.5\textheight]{}}}
+%   \splitfloat[lines=auto,inbetween=]
+%     {\placetable{\dorecurse{5}{test\recurselevel\endgraf}}}
+%     {\bTABLE[split=yes]
+%      \bTR \bTD 11 \eTD \bTD \input tufte \eTD \eTR
+%      \bTR \bTD 12 \eTD \bTD \input zapf \eTD \eTR
+%      \bTR \bTD 13 \eTD \bTD \input bryson \eTD \eTR
+%      \bTR \bTD 14 \eTD \bTD test  \eTD \eTR
+%      \bTR \bTD 21 \eTD \bTD \input tufte \eTD \eTR
+%      \bTR \bTD 22 \eTD \bTD \input zapf \eTD \eTR
+%      \bTR \bTD 23 \eTD \bTD \input bryson \eTD \eTR
+%      \bTR \bTD 24 \eTD \bTD test  \eTD \eTR
+%      \bTR \bTD 31 \eTD \bTD \input tufte \eTD \eTR
+%      \bTR \bTD 32 \eTD \bTD \input zapf \eTD \eTR
+%      \bTR \bTD 33 \eTD \bTD \input bryson \eTD \eTR
+%      \bTR \bTD 34 \eTD \bTD test  \eTD \eTR
+%      \eTABLE}
+%   \dorecurse{10}{\input tufte }
+% \stoptext