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+%D \module
+%D [ file=anch-pgr, % moved from anch-pgr (1999.08.01)
+%D version=2011.12.19, % 1999.08.01,
+%D title=\CONTEXT\ Anchoring Macros,
+%D subtitle=Table Extensions,
+%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 Anchoring Macros / Table Extensions}
+
+%D Beware, the code in this module is somewhat weird and experimental
+%D and might be dropped or become a loadable module.
+
+\unprotect
+
+%D \macros
+%D {GFC, GTC, GSC}
+%D
+%D The next macros extend tables and tabulation with
+%D backgrounds and position related features. Areas are
+%D specified with symbolic names, and symbolic references to
+%D the graphics involved. Each table has its own namespace.
+
+\newconditional\tablehaspositions
+\newcount\noftabpositions
+\newtoks \posXCtoks
+
+\def\dotablebpos{\bpos}
+\def\dotableepos{\epos}
+
+\def\tbPOSprefix
+ {tbp:\number\noftabpositions:}
+
+\def\tablepos
+ {\normalexpanded{\global\posXCtoks\emptytoks\the\posXCtoks}}
+
+\let\tabulatepos\tablepos
+
+\def\dodododoGSC[#1:#2]%
+ {\remappositionframed{#2}{\tbPOSprefix#1}%
+ \dotablebpos{\tbPOSprefix#1}%
+ \doglobal\appendtoks\@EA\dotableepos\@EA{\tbPOSprefix#1}\to\posXCtoks}
+
+\def\dododoGSC[#1:#2:#3]%
+ {\doglobal\appendtoks\dodododoGSC[#1:#2]\to\posXCtoks\NC}
+
+\def\dodoGSC[#1]%
+ {\def\docommand##1{\dododoGSC[##1:##1]}%
+ \processcommalist[#1]\docommand}
+
+\def\dodododoGFC[#1:#2:#3]%
+ {\remappositionframed{#2}{\tbPOSprefix#1}%
+ \dotablebpos{\tbPOSprefix#1}}
+
+\def\dododoGFC[#1]%
+ {\def\docommand##1{\dodododoGFC[##1:##1]}%
+ \processcommalist[#1]\docommand}
+
+\def\dodoGFC[#1]%
+ {\doglobal\appendtoks\dododoGFC[#1]\to\posXCtoks\NC}
+
+\def\dododododoGTC[#1:#2]%
+ {\dotableepos{\tbPOSprefix#1}}
+
+\def\dodododoGTC[#1]%
+ {\def\docommand##1{\dododododoGTC[##1:##1]}%
+ \processcommalist[#1]\docommand}
+
+\def\dododoGTC[#1]%
+ {\doglobal\appendtoks\dodododoGTC[#1]\to\posXCtoks}
+
+\def\dodoGTC[#1]%
+ {\doglobal\appendtoks\dododoGTC[#1]\to\posXCtoks\NC}
+
+\def\dodododoXC[#1#2]%
+ {\if#1>\dodoGFC [#2:#2]\else
+ \if#1+\dodoGFC [#2:#2]\else
+ \if#1<\dodoGTC [#2:#2]\else
+ \if#1-\dodoGTC [#2:#2]\else
+ \if#1=\dodoGSC [#2:#2]\else
+ \dodoGSC[#1#2:#1#2]\fi\fi\fi\fi\fi}
+
+\def\dododoXC#1%
+ {\dodododoXC[#1]}
+
+\def\dodoXC[#1]%
+ {{\let\NC\relax\processcommalist[#1]\dododoXC}}
+
+\def\@@checktablepositionstate
+ {\iftrialtypesetting
+ \global\settrue\tablehaspositions
+ \firstargumentfalse
+ \fi}
+
+\def\doGSC[#1]{\@@checktablepositionstate\iffirstargument\dodoGSC[#1]\else\expandafter\NC\fi}
+\def\doGFC[#1]{\@@checktablepositionstate\iffirstargument\dodoGFC[#1]\else\expandafter\NC\fi}
+\def\doGTC[#1]{\@@checktablepositionstate\iffirstargument\dodoGTC[#1]\else\expandafter\NC\fi}
+\def\doXC [#1]{\@@checktablepositionstate\iffirstargument\dodoXC [#1]\else\expandafter\fi\NC}
+
+\def\tbGSC{\dosingleempty\doGSC}
+\def\tbGFC{\dosingleempty\doGFC}
+\def\tbGTC{\dosingleempty\doGTC}
+\def\tbXC {\dosingleempty\doXC }
+
+%D The amount of code to support tables and tabulation is
+%D rather minimalistic.
+
+\let\tabulatepos\tablepos
+
+\def\tabulatenormalpos
+ {\iftrialtypesetting
+ % nothing
+ \else\ifconditional\tablehaspositions
+ \hss\tabulatepos\hss
+ \else
+ % nothing
+ \fi\fi}
+
+\def\tabulateequalpos
+ {\iftrialtypesetting
+ \tabulateEQ
+ \else\ifconditional\tablehaspositions
+ \tabulateEQpos
+ \else
+ \tabulateEQ
+ \fi\fi}
+
+\def\tabulateEQpos
+ {\setbox\scratchbox\hbox{\tabulateEQ}%
+ \hbox to \wd\scratchbox{\hss\kern\zeropoint\tabulatepos\hss}%
+ \hskip-\wd\scratchbox
+ \box\scratchbox}
+
+\appendtoks
+ \global\advance\noftabpositions\plusone
+ \global\setfalse\tablehaspositions
+\to \everytabulate
+
+% We need to handle paragraphs as well.
+
+\let\doflushtabulateepos\relax
+
+\def\dotabulatebpos
+ {\bpos}
+
+\def\dotabulateepos#1%
+ {\ifvoid\tablebox\tabulatecolumn
+ \epos{#1}%
+ \glet\doflushtabulateepos\relax
+ \else
+ \gdef\doflushtabulateepos{\epos{#1}}%
+ \fi}
+
+\def\flushtabulatesplitbox
+ {\box\tabulatebox
+ \iftrialtypesetting\else\ifconditional\tablehaspositions\doflushtabulateepos\fi\fi}
+
+\appendtoks
+ \let\dotablebpos\dotabulatebpos
+ \let\dotableepos\dotabulateepos
+ \glet\doflushtabulateepos\relax
+\to \everytabulate
+
+%D In order to prevent potential clashes with abbreviations,
+%D postpone the mapping.
+
+\appendtoks
+ \let\GSC\tbGSC
+ \let\GFC\tbGFC
+ \let\GTC\tbGTC
+ \let\XC \tbXC
+\to \everytabulate
+
+%D \macros
+%D {definepositionframed}
+%D
+%D The next example show how to provide backgrounds to table
+%D cells. First we define some framed backgrounds.
+%D
+%D \startbuffer
+%D \definepositionframed[x][background=color,backgroundcolor=red]
+%D \definepositionframed[y][background=color,backgroundcolor=green]
+%D \definepositionframed[z][background=color,backgroundcolor=blue]
+%D \stopbuffer
+%D
+%D \typebuffer
+%D
+%D % \getbuffer
+%D
+%D \startbuffer
+%D \starttabulate[|c|c|c|]
+%D \GFC[f:x] this is a small \NC table \NC in which we \NC \FR
+%D \NC will demonstrate \GFC[g:z] that this \GTC[g] positioning \NC \MR
+%D \GSC[e:y] mechanism also \GTC[f] works quite well \NC in tables \NC \LR
+%D \stoptabulate
+%D \stopbuffer
+%D
+%D The table itself defines three areas (a, b and~c) using
+%D these frames.
+%D
+%D \typebuffer
+%D % \getbuffer
+%D
+%D Tables (based on \TABLE) are supported by:
+
+\def\normalTABLEsimplebar {\unskip\!ttRightGlue&\tablepos&} % |
+\def\normalTABLEcomplexbar{\unskip\!ttRightGlue&\omit\tablepos\!ttAlternateVrule} % \|
+\def\normalTABLEquote {\unskip\!ttRightGlue&\omit\tablepos&} % "
+
+\appendtoks
+ \global\advance\noftabpositions\plusone
+ \global\setfalse\tablehaspositions
+\to \everytable
+
+%D Since we don't want nameclashes:
+
+\appendtoks
+ \let\GSC\tbGSC
+ \let\GFC\tbGFC
+ \let\GTC\tbGTC
+ \let\XC \tbXC
+\to \everytable
+
+%D In the previous example, we could have provided an overlay to
+%D the framed definition. A more direct approach is demonstrated
+%D below:
+%D
+%D \startbuffer
+%D \def\cw#1{\color[white]{#1}}
+%D
+%D \startMPpositiongraphic{tableshade}
+%D initialize_area(\MPpos{\MPvar{from}},\MPpos{\MPvar{to}}) ;
+%D color c ; c := \MPvar{color} ;
+%D linear_shade(pxy,0,.4c,.9c) ;
+%D anchor_area(\MPanchor{\MPvar{from}}) ;
+%D \stopMPpositiongraphic
+%D
+%D \setMPpositiongraphic{b:x}{tableshade}{from=b:x,to=e:x,color=red}
+%D \setMPpositiongraphic{b:y}{tableshade}{from=b:y,to=e:y,color=green}
+%D \setMPpositiongraphic{b:z}{tableshade}{from=b:z,to=e:z,color=blue}
+%D \stopbuffer
+%D
+%D \typebuffer \getbuffer
+%D
+%D The definition of the table looks about the same as the
+%D previous one:
+%D
+%D \startbuffer
+%D \starttable[|c|c|c|]
+%D \GFC[b:z] \cw{this is a small} \NC \cw{table} \NC in which we \NC \FR
+%D \NC \cw{will demonstrate} \GFC[c:y] \cw{that this} \GTC[c] \cw{positioning} \NC \MR
+%D \GSC[a:x] \cw{mechanism also} \GTC[b] \cw{works quite well} \NC in tables \NC \LR
+%D \stoptable
+%D \stopbuffer
+%D
+%D \typebuffer
+%D
+%D \getbuffer
+
+% \definepositionframed[w][background=color,backgroundcolor=yellow]
+% \definepositionframed[x][background=color,backgroundcolor=red]
+% \definepositionframed[y][background=color,backgroundcolor=green]
+% \definepositionframed[z][background=color,backgroundcolor=blue]
+%
+% \starttabulate[|c|c|c|]
+% \NC this is a small \NC table \NC in which we \NC \FR
+% \NC will demonstrate \NC that this \NC positioning \NC \MR
+% \NC mechanism also \NC works quite well \NC in tables \NC \LR
+% \stoptabulate
+%
+% \starttabulate[|c|c|c|]
+% \GFC[f:x] this is a small \GTC table \NC in which we \NC \FR
+% \NC will demonstrate \GFC[g:z] that this \GTC[g] positioning \NC \MR
+% \GSC[e:y] mechanism also \GTC[f] works quite well \NC in tables \NC \LR
+% \stoptabulate
+%
+% \starttabulate[|c|c|c|]
+% \GFC[f:x,d:w] this is a small \GTC[d] table \NC in which we \NC \FR
+% \NC will demonstrate \GFC[g:z] that this \GTC[g] positioning \NC \MR
+% \GSC[e:y] mechanism also \GTC[f] works quite well \NC in tables \NC \LR
+% \stoptabulate
+%
+% \starttabulate[|c|c|c|]
+% \XC[+f:x] this is a small \XC table \NC in which we \NC \FR
+% \NC will demonstrate \XC[+g:z] that this \XC[-g] positioning \NC \MR
+% \XC[=e:y] mechanism also \XC[-f] works quite well \NC in tables \NC \LR
+% \stoptabulate
+%
+% \starttabulate[|c|c|c|]
+% \XC[+f:x,+d:w] this is a small \XC[-d] table \NC in which we \NC \FR
+% \NC will demonstrate \XC[+g:z] that this \XC[-g] positioning \NC \MR
+% \XC[=e:y] mechanism also \XC[-f] works quite well \NC in tables \NC \LR
+% \stoptabulate
+
+% evt [b:x]
+%
+% \definepositionframed[x][background=color,fillcolor=red]
+% \definepositionframed[y][background=color,fillcolor=green]
+% \definepositionframed[z][background=color,fillcolor=blue]
+
+\def\remappositionframed#1#2% from to
+ {\copyposition{b:#1}{b:#2}%
+ \copyposition{e:#1}{e:#2}%
+ \dosetpositionaction{b:#2}{\dopositionaction{b:#1}}}
+
+\unexpanded\def\definepositionframed
+ {\dodoubleargument\dodefinepositionframed}
+
+\def\dodefinepositionframed[#1][#2]%
+ {\dosetpositionaction{b:#1}{\dopositionframed[#1][#2]}}
+
+\def\positionframed
+ {\dodoubleempty\dopositionframed}
+
+\def\dopositionframed[#1][#2]%
+ {\bgroup
+ \setbox\scratchbox\hbox
+ {\dimen0=\MPx{e:#1}%
+ \advance\dimen0 -\MPx{b:#1}%
+ \dimen2=\MPy{b:#1}%
+ \advance\dimen2 -\MPy{e:#1}%
+ \advance\dimen2 \MPd{e:#1}%
+ \lower\dimen2\hbox
+ {\advance\dimen2 \MPh{b:#1}%
+ \framed
+ [\c!width=\dimen0,\c!height=\dimen2,
+ \c!offset=\v!overlay,#2]{}}}%
+ \smashedbox\scratchbox
+ \egroup}
+
+% \def\sethdistances#1%
+% {\hbox{\lpos{ml:#1}\hpos{mh:#1}{\strut}\rpos{mr:#1}}}
+%
+% \def\gethdistances#1%
+% {\scratchdimen\MPx{mh:#1}%
+% \advance\scratchdimen -\MPx{ml#1}%
+% \edef\lefthdistance{\the\scratchdimen}%
+% \scratchdimen\MPx{mr:#1}%
+% \advance\scratchdimen -\MPx{mh:#1}%
+% \edef\righthdistance{\the\scratchdimen}}
+
+\protect \endinput
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