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%D \module
%D [ file=supp-ali,
%D version=2000.04.17,
%D title=\CONTEXT\ Support Macros,
%D subtitle=Alignment,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%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
% \starttabulate[|cg{.}|cg{,}|cg{,}|]
% \NC period \NC comma \NC comma \NC\NR
% \NG 100.000,00 \NG 100.000,00 \NG 100,00 \NC\NR
% \NG 10.000,00 \NG 10.000,00 \NG 1000,00 \NC\NR
% \NG 100,00 \NG 100,00 \NG 10,00 \NC\NR
% \NG 100,00 \NG 100,00 \NG 10,00 \NC\NR
% \NG 10\\ \NG 10\\ \NG 0,00 \NC\NR
% \NG 10 \NG 10 \NG 0,00 \NC\NR
% \NG 10 \NG 10 \NG 0,00 \NC\NR
% \stoptabulate
\chardef\characteralignmentmode=4
\chardef\characteralignmentslot=1
\newtoks\@@characteralignlst
\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
\let\\\empty
\setbox\scratchbox\hbox{#1}%
\edef\characterassignwidth{\the\wd\scratchbox}%
\setbox\scratchbox\emptyhbox
\docheckalignment##1#1\relax\relax
\scratchdimen-\wd\scratchbox
\setbox\scratchbox\hbox{\ignorespaces##1\unskip}%
\advance\scratchdimen \wd\scratchbox
\ifdim\scratchdimen>\beforeassignwidth\relax
\edef\beforeassignwidth{\the\scratchdimen}%
\fi
\ifdim\scratchdimen=\zeropoint
\setbox\scratchbox\hbox{\ignorespaces##1\unskip}%
\scratchdimen\wd\scratchbox
\ifcase\characteralignmentmode
% do nothing
\else\ifnum\characteralignmentmode<\plusthree
\advance\scratchdimen \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{\ignorespaces##1\unskip}%
\ifdim\wd\scratchbox>\afterassignwidth
\edef\afterassignwidth{\the\wd\scratchbox}%
\fi
\else
\docheckalignment##2##3\relax\relax
\fi}}
\def\setsecondpasscharacteralign
{\popcharacteralign
\expanded{\dosetsecondpasscharacteralign{\alignmentcharacter}}}
\def\dosetsecondpasscharacteralign#1%
{\def\checkalignment##1%
{\popcharacteralign
\let\\\empty % beware, no grouping
\setbox\scratchbox\hbox{#1}%
\edef\characterassignwidth{\the\wd\scratchbox}%
\setbox\scratchbox\emptyhbox
% new 12,34 vs 10\\ where 10 aligns on 12 if #1 = ,
\ifcase\characteralignmentslot
\docheckalignment##1#1\relax\relax
\scratchdimen\wd\scratchbox
\setbox\scratchbox\hbox{\ignorespaces##1\unskip}%
\else
\def\\{#1}%
\expanded{\docheckalignment##1#1\relax\relax}%
\scratchdimen\wd\scratchbox
\setbox\scratchbox\hbox{\def\\{\hphantom{#1}}\ignorespaces##1\unskip}%
\fi
\noindent
\ifdim\scratchdimen=\wd\scratchbox
\ifcase\characteralignmentmode
\box\scratchbox
\else
\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
\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{\ignorespaces##1\unskip}%
\else
\docheckalignment##2##3\relax\relax
\fi}}
% provide a means to use multiple alignments mixed
\def\pushcharacteralign
{\ifcsname @cac@\alignmentclass\endcsname\else
\doglobal\appendetoks\noexpand\do{\alignmentclass}\to\@@characteralignlst
\fi
\setxvalue{@cac@\alignmentclass}{\noexpand\do
{\afterassignwidth}{\beforeassignwidth}{\alignmentcharacter}}}
\def\popcharacteralign
{\def\do##1##2##3%
{\def\afterassignwidth {##1}%
\def\beforeassignwidth {##2}%
\def\alignmentcharacter{##3}}%
\executeifdefined{@cac@\alignmentclass}\donothing}
\def\resetcharacteralign % does not work well nested
{\def\do##1{\global\letbeundefined{@cac@##1}}% global !
\the\@@characteralignlst
\global\@@characteralignlst\emptytoks}
\long\def\startcharacteralign#1\stopcharacteralign
{\bgroup
\setfirstpasscharacteralign #1%
\setsecondpasscharacteralign#1%
\egroup}
\protect \endinput
|
