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%D The following bunch of macros come from plain \TEX\ by
%D Don Knuth and deal with basic alignment. We just include
%D them here so that they can be used if needed. Normally,
%D \CONTEXT\ users will fall back on one of the three table
%D environments.
%D
%D The hidden names are somewhat adapted and we use other
%D local variables.
\writestatus{loading}{ConTeXt Table Macros / Plain Tabular}
\unprotect
\newif \if@@plnusetab
\newif \if@@plncr
\newbox \@@plntabs
\newbox \@@plntabsyet
\newbox \@@plntabsdone
\newdimen \@@plntabdimen
\def\cleartabs % visible
{\global\setbox\@@plntabsyet\null
\setbox\@@plntabs\null}
\def\settabs % visible
{\setbox\@@plntabs\null
\futurelet\next\@@plnsettabs}
\def\tabalign % visible
{\@@plnusetabtrue\@@plnmaketabbox}
\let\+\tabalign % no outer here (can be overloaded)
\def\@@plnsettabs
{\ifx\next\+%
\def\nxt{\afterassignment\@@plnsettab\let\nxt}%
\else
\let\nxt\@@plnsetcols
\fi
\let\next\relax
\nxt}
\def\@@plnsettab
{\let\nxt\relax
\@@plnusetabfalse\@@plnmaketabbox}
\def\@@plnsetcols#1\columns
{\scratchcounter#1%
\@@plntabdimen\hsize
\loop
\ifnum\scratchcounter>\zerocount \@nother
\repeat}
\def\@nother
{\scratchdimen\@@plntabdimen
\divide\scratchdimen\scratchcounter
\setbox\@@plntabs\hbox{\hbox to\scratchdimen{}\unhbox\@@plntabs}%
\advance\@@plntabdimen-\scratchdimen
\advance\scratchcounter\minusone}
\def\@@plnmaketabbox
{\begingroup
\global\setbox\@@plntabsyet\copy\@@plntabs
\global\setbox\@@plntabsdone\null
\def\cr
{\@@plncrtrue\crcr\egroup\egroup
\if@@plnusetab\unvbox\zerocount\lastbox\fi\endgroup
\setbox\@@plntabs\hbox{\unhbox\@@plntabsyet\unhbox\@@plntabsdone}}%
\setbox\zerocount\vbox\bgroup\@@plncrfalse
\ialign\bgroup&\@@plnbegintabbox##\@@plnendtabbox\crcr}
\def\@@plnbegintabbox
{\setbox\zerocount\hbox\bgroup}
\def\@@plnendtabbox
{\if@@plncr
\egroup % now \box\zerocount holds the column
\else
\hss\egroup
\global\setbox\@@plntabsyet\hbox
{\unhbox\@@plntabsyet\global\setbox\plusone\lastbox}% now \box\plusone holds its size
\ifvoid\plusone
\global\setbox\plusone\hbox to\wd\zerocount{}%
\else
\setbox\zerocount\hbox to\wd\plusone{\unhbox\zerocount}%
\fi
\global\setbox\@@plntabsdone\hbox{\box\plusone\unhbox\@@plntabsdone}%
\fi
\box\zerocount}
\protect \endinput
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