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%D \module
%D [ file=meta-tex,
%D version=2006.06.07,
%D title=\CONTEXT\ Support Macros,
%D subtitle=\METAPOST\ fast text insertion,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright=\PRAGMA]
%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 Many thanks to Fabrice Popineau and Taco Hoekwater in helping me
%D figure out some aspects of the text inclusion method implemented
%D here. The following code is derived from a more advanced (and to
%D be used) mechanism where \TEX, \METAPOST\ and \LUA\ play together.
%D Much of this mechanism was written with running live DVD's of
%D the Dave Matthews band in the background (or the corner of my
%D screen).
\unprotect
\newwrite\TeXtextwrite
\def\openTeXtexts {\immediate\openout \TeXtextwrite\currentTeXtext.mpb\relax}
\def\closeTeXtexts{\immediate\closeout\TeXtextwrite}
\def\currentTeXtext{\jobname-mpgraph}
\initializeboxstack\currentTeXtext
\newtoks\collectedmptexts
\long\def\startTeXtexts#1\stopTeXtexts
{\global\collectedmptexts\expandafter{\the\collectedmptexts#1}}
\def\dostartTeXtexts
{\global\setfalse\TeXtextdone
\startnointerference
\the\everyMPTEXgraphic
\openTeXtexts
\ifrunMPgraphics
\initializeboxstack\currentTeXtext
\else
\global\let\openTeXtexts\relax
\global\let\finishTeXtexts\closeTeXtexts
\fi}
\def\dostopTeXtexts
{\ifrunMPgraphics
\closeTeXtexts
\fi
\stopnointerference}
\let\finishTeXtexts\relax
\appendtoks
\finishTeXtexts
\to \everystoptext
\newconditional\TeXtextdone
% \long\def\TeXtext#1%
% {\dowithnextboxcontent
% {\setnormalcatcodes}
% {\global\settrue\TeXtextdone
% \immediate\write\TeXtextwrite{savetxt(#1,\the\wd\nextbox,\the\ht\nextbox,\the\dp\nextbox);}%
% \savebox\currentTeXtext{#1}{\box\nextbox}}
% \hbox}
\long\def\TeXtext
{\dosingleempty\doTeXtext}
\long\def\doTeXtext[#1]#2#3%
{\begingroup
\setbox\nextbox\hbox
{\setnormalcatcodes
\newlinechar=`\^^M
\everyeof\emptytoks
%\def\ascii{#3}%
%\scantokens\expandafter{\ascii}}%
\scantokens{#3}}%
\global\settrue\TeXtextdone
\edef\currenttextxt{\number#2}%
\executeifdefined{textext::#1}{\getvalue{textext::depth}}%
\savebox\currentTeXtext\currenttextxt{\box\nextbox}%
\endgroup}
\setvalue{textext::depth}{\immediate\write\TeXtextwrite{savetxt(\currenttextxt,\the\nextboxwd,\the\nextboxht,\the\nextboxdp) shifted (0,-\the\nextboxdp);}}
\setvalue{textext::nodepth}{\immediate\write\TeXtextwrite{savetxt(\currenttextxt,\the\nextboxwd,\the\nextboxht,\the\nextboxdp);}}
\setvalue{textext::d}{\getvalue{textext::depth}}
\setvalue{textext::n}{\getvalue{textext::nodepth}}
\newbox\mptextbox
\definefontsynonym[MPtxtfont][texnansi-lmtt10] \loadmapfile[lm-texnansi.map]
\definefont[localMPtxtfont][MPtxtfont at 10bp]
\ifx\getTeXtext\undefined
% this took a while to figure out
% \def\getTeXtext
% {\localMPtxtfont
% \setbox\mptextbox\hbox{\foundbox\currentTeXtext{\number\nofTeXtexts}}%
% \setbox\scratchbox\hbox{\MPtextdata}%
% \edef\mpwd{\the\dimexpr\MPtextsize\dimexpr\wd\scratchbox/10\relax\relax}%
% \edef\mpht{\the\dimexpr\MPtextsize\dimexpr\ht\scratchbox/10\relax\relax}%
% \setbox\mptextbox\hbox{\raise\dp\mptextbox\box\mptextbox}%
% \dp\mptextbox\zeropoint
% \scale[\c!width=\mpwd,\c!height=\mpht]{\box\mptextbox}}%
\def\getTeXtext
{\localMPtxtfont
\setbox\mptextbox\hbox{\foundbox\currentTeXtext{\number\nofTeXtexts}}%
\setbox\scratchbox\hbox{\MPtextdata}%
\edef\mpwd{\the\dimexpr\MPtextsize\dimexpr\wd\scratchbox/10\relax\relax}%
\edef\mpht{\the\dimexpr\MPtextsize\dimexpr\ht\scratchbox/10\relax\relax}%
\setbox\mptextbox\hbox{\raise\dp\mptextbox\box\mptextbox}%
\dp\mptextbox\zeropoint
\scale[\c!width=\mpwd,\c!height=\mpht]{\box\mptextbox}}
\fi
\setvalue{handleMPtext00001}% only height in tag (00001)
{\setbox\scratchbox\hbox
{\obeyMPspecials
\edef\nofTeXtexts{\number\MPtextnumber}%
\getTeXtext}%
\setbox\scratchbox\hbox
{\hskip\lastMPmoveX\onebasepoint\raise\lastMPmoveY\onebasepoint
\box\scratchbox}%
\ht\scratchbox\zeropoint
\dp\scratchbox\zeropoint
\wd\scratchbox\zeropoint
\box\scratchbox}
\startMPextensions
string txtfile ; txtfile := "\currentTeXtext.mpb" ;
string txtfont ; txtfont := "\truefontname{MPtxtfont}" ;
string txtpref ; txtpref := "00001::::" ;
\stopMPextensions
% \long\def\filtersometxt#1\sometxt#2#3#4%
% {\ifx#3\empty
% \else
% \increment\txtcounter
% \TeXtext\txtcounter{#2}%
% \expandafter\filtersometxt
% \fi#3#4}
\long\def\dodofiltersometxt#1#2#3%
{\ifx#2\empty
\else
\increment\txtcounter
\TeXtext\txtcounter{#1}%
\expandafter\filtersometxt
\fi#2#3}
\long\def\redofiltersometxt[#1]#2%
{\increment\txtcounter
\TeXtext[#1]\txtcounter{#2}%
\filtersometxt}
\long\def\filtersometxt#1\sometxt
{\doifnextcharelse[\redofiltersometxt\dodofiltersometxt}
% \filtersometxt abc\sometxt{def};hij\sometxt{klm};\sometxt{}\empty\relax
\long\def\flushTeXtexts#1%
{\newcounter\txtcounter
\dostartTeXtexts
\the\collectedmptexts
\filtersometxt#1\sometxt{}\empty\relax
\dostopTeXtexts
\ifconditional\TeXtextdone
\immediate\write\MPwrite{loadtxts ; txtnext := 0 ;}%
\global\collectedmptexts\emptytoks
\fi
\newcounter\txtcounter}
% \long\def\sometxt#1{sometxt(nexttxt)} % to be used in mp definitions, no ; here
\long\def\sometxt #1#{\dosometxt} % grab optional [args]
\long\def\dosometxt#1{sometxt(nexttxt)} % to be used in mp definitions, no ; here
% we redefine the writer:
\long\def\writecheckedMPgraphic#1%
{\ifforceMPTEXgraphic
\global\MPTEXgraphictrue
\else
\global\MPTEXgraphicfalse
\edef\ascii{#1}\convertcommand\ascii\to\MPascii
\the\MPTEXgraphicchecks\relax % \relax is end condition!
\fi
\flushMPTEXgraphic% % verbatimtex etc
\flushTeXtexts{#1}% added
\writeMPgraphic{#1}} % potential optimization: pass \ascii
\protect \endinput
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