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%D \module
%D [ file=core-two, % moved from core-uti
%D version=1997.03.31,
%D title=\CONTEXT\ Core Macros,
%D subtitle=Two Pass Data,
%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 Core Macros / Two Pass Data}
%D This is a rather old mechanism which has not changed much over
%D time, apart from adding a few more selectors. This code used
%D to be part of \type {core-uti}. The following examples demonstrate
%D the interface.
%D
%D \startbuffer
%D \definetwopasslist{test-1}
%D
%D \gettwopassdatalist{test-1} [\twopassdatalist=]
%D \checktwopassdata {test-1} [\twopassdata=]
%D \checktwopassdata {test-1} [\twopassdata=]
%D \gettwopassdata {test-1} [\twopassdata=]
%D \gettwopassdata {test-1} [\twopassdata=]
%D
%D \definetwopasslist{test-2}
%D
%D \lazysavetwopassdata{test-2}{1}{x}
%D \lazysavetwopassdata{test-2}{2}{y}
%D \lazysavetwopassdata{test-2}{3}{z}
%D
%D \gettwopassdatalist{test-2} [\twopassdatalist=x,y,z]
%D \checktwopassdata {test-2} [\twopassdata=x]
%D \checktwopassdata {test-2} [\twopassdata=x]
%D \gettwopassdata {test-2} [\twopassdata=x]
%D \gettwopassdata {test-2} [\twopassdata=y]
%D \gettwopassdata {test-2} [\twopassdata=z]
%D \gettwopassdata {test-2} [\twopassdata=]
%D
%D \definetwopasslist{test-3}
%D
%D \lazysavetaggedtwopassdata{test-3}{1}{x}{a}
%D \lazysavetaggedtwopassdata{test-3}{2}{y}{b}
%D \lazysavetaggedtwopassdata{test-3}{3}{z}{c}
%D
%D \findtwopassdata{test-3}{x} [\twopassdata=a]
%D \findtwopassdata{test-3}{y} [\twopassdata=b]
%D \findtwopassdata{test-3}{z} [\twopassdata=c]
%D \findtwopassdata{test-3}{w} [\twopassdata=]
%D
%D \definetwopasslist{test-4}
%D
%D \lazysavetwopassdata{test-4}{1}{A}
%D \lazysavetwopassdata{test-4}{2}{B}
%D \lazysavetwopassdata{test-4}{3}{C}
%D
%D \getfirsttwopassdata{test-4} [\twopassdata=A]
%D \getlasttwopassdata {test-4} [\twopassdata=C]
%D \getfirsttwopassdata{test-4} [\twopassdata=A]
%D \getlasttwopassdata {test-4} [\twopassdata=C]
%D \getfromtwopassdata {test-4}{1} [\twopassdata=A]
%D \getfromtwopassdata {test-4}{3} [\twopassdata=C]
%D \getfromtwopassdata {test-4}{2} [\twopassdata=B]
%D \stopbuffer
%D
%D \getbuffer \typebuffer
\unprotect
\let\alltwopasslists\empty
\let\twopassentry \empty
\let\twopassdata \empty
\let\twopassdatalist\empty
\newif\iftwopassdatafound
\let\savetwopassdata \gobblethreearguments
\let\lazysavetwopassdata \gobblethreearguments
\let\savetaggedtwopassdata \gobblefourarguments
\let\lazysavetaggedtwopassdata\gobblefourarguments
\let\twopassentry \gobblethreearguments % permits loading a MK II file
\let\loadtwopassdata\relax % permits loading a MK II file
\let\definetwopasslist\gobbleoneargument
\def\gettwopassdata #1{\let\twopassdata \empty \twopassdatafoundfalse}
\def\checktwopassdata #1{\let\twopassdata \empty \twopassdatafoundfalse}
\def\findtwopassdata #1#2{\let\twopassdata \empty \twopassdatafoundfalse}
\def\getlasttwopassdata #1{\let\twopassdata \empty \twopassdatafoundfalse}
\def\getfromtwopassdata #1#2{\let\twopassdata \empty \twopassdatafoundfalse}
\def\gettwopassdatalist #1{\let\twopassdatalist\empty \twopassdatafoundfalse}
\def\getnamedtwopassdatalist#1#2{\let#1 \empty \twopassdatafoundfalse}
\def\doifelseintwopassdata #1#2{\secondoftwoarguments}
\loadmarkfile{core-two}
\protect \endinput
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