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%D \module
%D [ file=supp-ali,
%D version=2000.4.17,
%D title=\CONTEXT\ Support Macros,
%D subtitle=Alignment,
%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.
%D Yet undocumented.
% 0 = centered
% 1 = left in before
% 2 = right in before
% 3 = left in after
% 4 = right in after
\unprotect
\chardef\characteralignmentmode=4
\let\afterassignwidth \!!zeropoint
\let\beforeassignwidth\!!zeropoint
\def\alignmentcharacter{.}
\let\alignmentclass\s!default % can be used to handle multiple mixed ones
\def\setfirstpasscharacteralign%
{\popcharacteralign
\expanded{\dosetfirstpasscharacteralign{\alignmentcharacter}}}
\def\dosetfirstpasscharacteralign#1%
{\def\checkalignment##1%
{\popcharacteralign
\setbox\scratchbox=\hbox{#1}%
\edef\characterassignwidth{\the\wd\scratchbox}%
\setbox\scratchbox=\hbox{}%
\docheckalignment#1##1#1\relax\relax
\scratchdimen=-\wd\scratchbox
\setbox\scratchbox=\hbox{##1}%
\advance\scratchdimen by \wd\scratchbox
\ifdim\scratchdimen>\beforeassignwidth\relax
\edef\beforeassignwidth{\the\scratchdimen}%
\fi
\ifdim\scratchdimen=\!!zeropoint
\setbox\scratchbox=\hbox{##1}%
\scratchdimen=\wd\scratchbox
\ifnum\characteralignmentmode=0
% do nothing
\else\ifnum\characteralignmentmode<3
\advance\scratchdimen by \characterassignwidth
\ifdim\scratchdimen>\beforeassignwidth\relax
\edef\beforeassignwidth{\the\scratchdimen}%
\fi
\else
\ifdim\scratchdimen>\afterassignwidth\relax
\edef\afterassignwidth{\the\scratchdimen}%
\fi
\fi\fi
\fi
\pushcharacteralign}%
\def\docheckalignment##1#1##2##3\relax%
{\ifx##2\relax
\setbox\scratchbox=\hbox{##1}%
\ifdim\wd\scratchbox>\afterassignwidth
\edef\afterassignwidth{\the\wd\scratchbox}%
\fi
\else
\docheckalignment##2##3\relax
\fi}}
\def\setsecondpasscharacteralign%
{\popcharacteralign
\expanded{\dosetsecondpasscharacteralign{\alignmentcharacter}}}
\def\dosetsecondpasscharacteralign#1%
{\def\checkalignment##1%
{\popcharacteralign
\setbox\scratchbox=\hbox{#1}%
\edef\characterassignwidth{\the\wd\scratchbox}%
\setbox\scratchbox=\hbox{}%
\docheckalignment#1##1#1\relax\relax
\scratchdimen=\wd\scratchbox
\setbox\scratchbox=\hbox{##1}%
\ifdim\scratchdimen=\wd\scratchbox
\ifcase\characteralignmentmode
\noindent\box\scratchbox
\else
\noindent\hbox
{\dontcomplain
\hbox to \beforeassignwidth
{\ifcase\characteralignmentmode\or
\box\scratchbox\hss
\or
\hss\box\scratchbox\hskip\characterassignwidth
\or
\hss\rlap{\box\scratchbox}%
\or
\hss\rlap{\hbox to \afterassignwidth{\hss\box\scratchbox}}%
\fi}%
\hskip\afterassignwidth}%
\fi
\else
\noindent\hbox
{\hbox to \beforeassignwidth
{\hss\box\scratchbox\hskip-\scratchdimen}%
\hskip\afterassignwidth}%
\fi}%
\def\docheckalignment##1#1##2##3\relax%
{\ifx##2\relax
\setbox\scratchbox=\hbox{##1}%
\else
\docheckalignment##2##3\relax
\fi}}
% provide a means to use multiple alignments mixed
\def\pushcharacteralign%
{\setxvalue{@cac@\alignmentclass}{\noexpand\do
{\afterassignwidth}{\beforeassignwidth}{\alignmentcharacter}}}
\def\popcharacteralign%
{\def\do##1##2##3%
{\def\afterassignwidth {##1}%
\def\beforeassignwidth {##2}%
\def\alignmentcharacter{##3}}%
\getvalue{@cac@\alignmentclass}}
\long\def\startcharacteralign#1\stopcharacteralign%
{\bgroup
\setfirstpasscharacteralign #1%
\setsecondpasscharacteralign#1%
\egroup}
\protect \endinput
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