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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 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.
\writestatus{loading}{ConTeXt Core Macros / Two Pass Data}
%D This is a rather old mechanism which has not changed much over time, apart from
%D adding a few more selectors. This code used to be part of \type {core-uti}. The
%D following examples demonstrate 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
\registerctxluafile{core-two}{}
\permanent\def\immediatesavetwopassdata #1#2#3{\normalexpanded{\noexpand\clf_savetwopassdata{#1}{#3}}}
\permanent\def \lazysavetwopassdata #1#2#3{\normalexpanded{\noexpand\ctxlatecommand{savetwopassdata("#1","#3")}}}
\permanent\let \savetwopassdata \lazysavetwopassdata
\permanent\def \savetaggedtwopassdata#1#2#3#4{\normalexpanded{\noexpand\clf_savetaggedtwopassdata{#1}{#3}{#4}}}
\permanent\def\lazysavetaggedtwopassdata#1#2#3#4{\normalexpanded{\noexpand\ctxlatecommand{savetaggedtwopassdata("#1",'#3',"#4")}}}
% temp hack: needs a proper \starteverytimeluacode
\setfalse\twopassdatafound
\mutable\let\twopassdata \empty
\mutable\let\twopassdatalist\empty
\mutable\let\noftwopassitems\!!zeropoint
\def\syst_twopass_check % can be delegated to lua once obsolete is gone
{\ifempty\twopassdata
\setfalse\twopassdatafound
\else
\settrue\twopassdatafound
\fi}
\permanent\protected\def\definetwopasslist #1{\clf_definetwopasslist{#1}}
\permanent\protected\def\gettwopassdata #1{\edef\twopassdata {\clf_gettwopassdata {#1}}\syst_twopass_check}
\permanent\protected\def\checktwopassdata #1{\edef\twopassdata {\clf_checktwopassdata {#1}}\syst_twopass_check}
\permanent\protected\def\findtwopassdata #1#2{\edef\twopassdata {\clf_findtwopassdata {#1}{#2}}\syst_twopass_check}
\permanent\protected\def\getfirsttwopassdata #1{\edef\twopassdata {\clf_getfirsttwopassdata {#1}}\syst_twopass_check}
\permanent\protected\def\getlasttwopassdata #1{\edef\twopassdata {\clf_getlasttwopassdata {#1}}%
\edef\noftwopassitems{\clf_counttwopassdata {#1}}\syst_twopass_check}
\permanent\protected\def\getnamedtwopassdatalist#1#2{\edef #1{\clf_gettwopassdatalist {#2}}}
\permanent\protected\def\gettwopassdatalist #1{\edef\twopassdatalist{\clf_gettwopassdatalist {#1}}}
\permanent\protected\def\doifelseintwopassdata #1#2{\clf_doifelseintwopassdata{#1}{#2}}
\aliased\let\doifintwopassdataelse\doifelseintwopassdata
\aliased\let\getfromtwopassdata \findtwopassdata
\protect \endinput
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