%D \module
%D   [       file=core-two, % moved from core-uti
%D        version=1997.03.31, % stripped down 2023-03-21
%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.

%D The public interface is replaced by datasets and two pass data is now private
%D to the engine. For the moment we keep some commands commented. The unused
%D (second) argument is an inheritance from \MKII. If needed we can bring back
%D a compatible interface.

\writestatus{loading}{ConTeXt Core Macros / Two Pass Data}

\unprotect

\registerctxluafile{core-two}{autosuffix}

% %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
%
% %D The next code can be simplified (read: defined at the \LUA\ end) but we never use this
% %D mechanism which has been replaced by datasets so it's not worth the effort.
%
% \permanent\def\immediatesavetwopassdata   #1#2#3{\expanded{\noexpand\clf_savetwopassdata{#1}{#3}}}
% \permanent\def     \lazysavetwopassdata   #1#2#3{\expanded{\noexpand\ctxlatecommand{savetwopassdata("#1","#3")}}}
% \permanent\let         \savetwopassdata          \lazysavetwopassdata
% \permanent\def    \savetaggedtwopassdata#1#2#3#4{\expanded{\noexpand\clf_savetaggedtwopassdata{#1}{#3}{#4}}}
% \permanent\def\lazysavetaggedtwopassdata#1#2#3#4{\expanded{\noexpand\ctxlatecommand{savetaggedtwopassdata("#1","#3","#4")}}}
%
% % temp hack: needs a proper \starteverytimeluacode
%
% \newconditional\twopassdatafound
%
% \mutable\lettonothing\twopassdata
% \mutable\lettonothing\twopassdatalist
%
% \mutable\let\noftwopassitems\!!zeropoint
%
% \def\syst_twopass_check % can be delegated to lua once obsolete is gone
%   {\ifempty\twopassdata
%      \twopassdatafound\conditionalfalse
%    \else
%      \twopassdatafound\conditionaltrue
%    \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