/
meta-ini.mkiv
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meta-ini.mkiv
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%D \module
%D [ file=meta-ini,
%D version=2008.03.25,
%D title=\METAPOST\ Graphics,
%D subtitle=Initialization,
%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.
% initializations:
%
% - pass settings from tex to mp (delayed expansion)
% - used by context core (and modules)
% - cummulative definitions
% - flushed each graphic
% - can be disabled per instance
% - managed at the tex end
%
% extensions:
%
% - add mp functionality (immediate expansion)
% - cummulative
% - all instances or subset of instances
% - can be disabled per instance
% - managed at the lua/mp end
% - could be managed at the tex end but no real reason and also messy
%
% definitions:
%
% - add mp functionality (delayed expansion)
% - cummulative
% - per instance
% - managed at the tex end
%
% inclusions:
%
% - add mp functionality (delayed expansion)
% - cummulative only when [+]
% - per instance
% - managed at the tex end
%
% order of execution:
%
% definitions
% extensions
% inclusions
% beginfig
% initializations
% graphic
% endfig
% The instance will be implemented stepwise ... I should redo some code in order to
% make the macros look better than they do now.
\writestatus{loading}{MetaPost Graphics / Initializations}
\registerctxluafile{meta-ini}{}
\unprotect
\newtoks \everyMPgraphic % mp % public or not ?
\appendtoks
\restoreendofline % see interferences-001.tex
\to \everyMPgraphic
\def\MPruntimefile {mprun}
\def\currentMPformat {metafun}
\def\defaultMPinstance{metafun}
%installcorenamespace{graphicvariable} % todo
\installcorenamespace{mpinstance}
\installcorenamespace{mpinclusions}
\installcorenamespace{mpdefinitions}
\installcorenamespace{mpgraphic}
\installcorenamespace{mpstaticgraphic}
\installcorenamespace{mpclip}
\newtoks \t_meta_initializations % tex, each
\def \t_meta_inclusions {\csname\??mpinclusions \currentMPinstance\endcsname} % token register
\def \t_meta_definitions {\csname\??mpdefinitions\currentMPinstance\endcsname} % token register
%D The next command is, of course, dedicated to Mojca, who needs it for gnuplot.
%D Anyway, the whole multiple engine mechanism is to keep her gnuplot from
%D interfering.
\unexpanded\def\startMPdefinitions
{\dosinglegroupempty\meta_start_definitions}
\def\meta_start_definitions#1#2\stopMPdefinitions
{\let\m_meta_saved_instance\currentMPinstance
\edef\currentMPinstance{#1}%
\ifx\currentMPinstance\empty
\let\currentMPinstance\defaultMPinstance
\fi
\gtoksapp\t_meta_definitions{#2}%
\let\currentMPinstance\m_meta_saved_instance}
\let\stopMPdefinitions\relax
\unexpanded\def\startMPextensions
{\dosinglegroupempty\meta_start_extensions}
\def\meta_start_extensions#1#2\stopMPextensions % we could use buffers instead
{\clf_setmpextensions{#1}{#2}}
\let\stopMPextensions\relax
\unexpanded\def\startMPinitializations#1\stopMPinitializations % for all instances, when enabled
{\gtoksapp\t_meta_initializations{#1}}
\let\stopMPinitializations\relax
\unexpanded\def\startMPinclusions
{\dosingleempty\meta_start_inclusions}
\unexpanded\def\meta_start_inclusions[#1]%
{\edef\m_meta_option{#1}%
\dosinglegroupempty\meta_start_inclusions_indeed}
\def\meta_start_inclusions_indeed#1#2\stopMPinclusions
{\let\m_meta_saved_instance\currentMPinstance
\edef\currentMPinstance{#1}%
\ifx\currentMPinstance\empty
\let\currentMPinstance\defaultMPinstance
\fi
\ifx\m_meta_option\!!plustoken \else
\global\t_meta_inclusions\emptytoks
\fi
\gtoksapp\t_meta_inclusions{#2}%
\let\currentMPinstance\m_meta_saved_instance}
\let\stopMPinclusions\relax
\unexpanded\def\MPinclusions
{\dosingleempty\meta_inclusions}
\def\meta_inclusions[#1]%
{\edef\m_meta_option{#1}%
\dosinglegroupempty\meta_inclusions_indeed}
\def\meta_inclusions_indeed#1#2%
{\let\m_meta_saved_instance\currentMPinstance
\edef\currentMPinstance{#1}%
\ifx\currentMPinstance\empty
\let\currentMPinstance\defaultMPinstance
\fi
\ifx\m_meta_option\!!plustoken \else
\global\t_meta_inclusions\emptytoks
\fi
\gtoksapp\t_meta_inclusions{#2}%
\let\currentMPinstance\m_meta_saved_instance}
\installcommandhandler \??mpinstance {MPinstance} \??mpinstance
\setupMPinstance
[\s!format=metafun,
\s!extensions=\v!no,
\s!initializations=\v!no,
\c!method=\s!default,
\c!textstyle=,
\c!textcolor=]
\appendtoks
\ifcsname\??mpdefinitions\currentMPinstance\endcsname \else
\expandafter\newtoks\csname\??mpdefinitions\currentMPinstance\endcsname
\fi
\ifcsname\??mpinclusions\currentMPinstance\endcsname \else
\expandafter\newtoks\csname\??mpinclusions\currentMPinstance\endcsname
\fi
\t_meta_definitions\emptytoks % in case we redefine
\t_meta_inclusions \emptytoks % in case we redefine
\to \everydefineMPinstance
\unexpanded\def\resetMPinstance[#1]%
{\writestatus\m!metapost{reset will be implemented when needed}}
\def\meta_analyze_graphicname[#1]%
%{\normalexpanded{\meta_analyze_graphicname_indeed[#1::::]}}
{\normalexpanded{\meta_analyze_graphicname_indeed[#1}::::]}
\def\meta_show_properties_indeed
{\writestatus{metapost}{name: \currentMPgraphicname, instance: \currentMPinstance, format: \currentMPformat}}
\let\meta_show_properties\donothing
\installtextracker
{metapost.properties}
{\let\meta_show_properties\meta_show_properties_indeed}
{\let\meta_show_properties\donothing}
\unexpanded\def\meta_analyze_graphicname_indeed[#1::#2::#3]% instance ::
{\edef\currentMPgraphicname{#2}%
\ifx\currentMPgraphicname\empty
\edef\currentMPgraphicname{#1}%
\let\currentMPinstance\defaultMPinstance
\else\ifcsname\??mpdefinitions#1\endcsname
\edef\currentMPinstance{#1}%
\else
\let\currentMPinstance\defaultMPinstance
\fi\fi
\edef\currentMPformat{\MPinstanceparameter\s!format}%
\meta_show_properties}
\def\currentMPgraphicname{\s!unknown}
\def\currentMPinstance {\defaultMPinstance}
\def\currentMPformat {\currentMPinstance}
\defineMPinstance[metafun] [\s!format=metafun,\s!extensions=\v!yes,\s!initializations=\v!yes]
\defineMPinstance[minifun] [\s!format=minifun,\s!extensions=\v!yes,\s!initializations=\v!yes]
\defineMPinstance[extrafun] [\s!format=metafun,\s!extensions=\v!yes,\s!initializations=\v!yes]
\defineMPinstance[lessfun] [\s!format=metafun]
\defineMPinstance[doublefun] [\s!format=metafun,\s!extensions=\v!yes,\s!initializations=\v!yes,\c!method=\s!double]
\defineMPinstance[binaryfun] [\s!format=metafun,\s!extensions=\v!yes,\s!initializations=\v!yes,\c!method=\s!binary]
\defineMPinstance[decimalfun] [\s!format=metafun,\s!extensions=\v!yes,\s!initializations=\v!yes,\c!method=\s!decimal]
\defineMPinstance[mprun] [\s!format=metafun,\s!extensions=\v!yes,\s!initializations=\v!yes]
\defineMPinstance[metapost] [\s!format=mpost]
\defineMPinstance[nofun] [\s!format=mpost]
\defineMPinstance[doublepost] [\s!format=mpost,\c!method=\s!double]
\defineMPinstance[binarypost] [\s!format=mpost,\c!method=\s!binary]
\defineMPinstance[decimalpost][\s!format=mpost,\c!method=\s!decimal]
%defineMPinstance[megapost] [\s!format=mpost,\c!method=\s!decimal]
\newconditional\c_meta_include_initializations
\def\meta_begin_graphic_group#1%
{\begingroup
\meta_analyze_graphicname[#1]}
\def\meta_end_graphic_group
{\endgroup}
\def\MPaskedfigure{false}
\def\meta_flush_current_initializations
{\ifconditional\c_meta_include_initializations
\the\t_meta_initializations
\fi}
% \theMPrandomseed;}
\def\meta_flush_current_inclusions
{\the\t_meta_inclusions}
\def\meta_flush_current_definitions
{\the\t_meta_definitions}
\def\meta_start_current_graphic
{\begingroup
\meta_enable_include
\the\everyMPgraphic
\edef\p_initializations{\MPinstanceparameter\s!initializations}%
\ifx\p_initializations\v!yes
\settrue \c_meta_include_initializations
\else
\setfalse\c_meta_include_initializations
\fi
\edef\p_setups{\MPinstanceparameter\c!setups}%
\ifx\p_setups\empty \else
\setups[\p_setups]%
\fi
\useMPinstancestyleparameter\c!textstyle}
\def\meta_set_current_color
{\useMPinstancecolorparameter\c!textcolor}
\def\meta_stop_current_graphic
{\global\t_meta_definitions\emptytoks
\global\t_meta_inclusions\emptytoks
\endgroup}
\def\meta_process_graphic_start
{\pushMPboundingbox
\setbox\b_meta_graphic\hpack\bgroup}
\def\meta_process_graphic_stop
{\egroup
\meta_place_graphic
\popMPboundingbox}
\unexpanded\def\meta_process_graphic_instance#1%
{\edef\currentMPinstance{#1}%
\ifx\currentMPinstance\empty
\let\currentMPinstance\defaultMPinstance
\fi
\edef\currentMPformat{\MPinstanceparameter\s!format}%
\meta_process_graphic}
\unexpanded\def\meta_process_graphic#1% todo: extensions and inclusions outside beginfig
{\meta_start_current_graphic
\forgetall
\edef\p_extensions{\MPinstanceparameter\s!extensions}%
\meta_process_graphic_start
\normalexpanded{\noexpand\clf_mpgraphic
instance {\currentMPinstance}%
format {\currentMPformat}%
data {#1;}%
initializations {\meta_flush_current_initializations}%
\ifx\p_extensions\v!yes
extensions {\clf_getmpextensions{\currentMPinstance}}% goes through tex again
\fi
inclusions {\meta_flush_current_inclusions}%
definitions {\meta_flush_current_definitions}%
figure {\MPaskedfigure}%
method {\MPinstanceparameter\c!method}%
namespace {\??graphicvariable\currentmpvariableclass:}%
\relax}%
\meta_process_graphic_stop
\meta_stop_current_graphic}
\let\meta_process_graphic_figure_start\relax
\let\meta_process_graphic_figure_stop \relax
\unexpanded\def\processMPfigurefile#1% special case: obeys beginfig .. endfig and makes pages
{\begingroup
\let\normal_meta_process_graphic_start\meta_process_graphic_start
\let\normal_meta_process_graphic_stop \meta_process_graphic_stop
\let\meta_process_graphic_start\relax
\let\meta_process_graphic_stop \relax
\def\meta_process_graphic_figure_start{\startTEXpage[\c!offset=\v!overlay,\c!align=]\normal_meta_process_graphic_start}%
\def\meta_process_graphic_figure_stop {\normal_meta_process_graphic_stop\stopTEXpage}
\def\MPaskedfigure{all}%
\meta_process_graphic{input "#1" ;}%
\endgroup}
%D Calling up previously defined graphics.
% \def\includeMPgraphic#1% gets expanded !
% {\ifcsname\??mpgraphic#1\endcsname
% \csname\??mpgraphic#1\endcsname ; % ; is safeguard
% \fi}
%
% \unexpanded\def\meta_enable_include % public
% {\let\meta_handle_use_graphic \thirdofthreearguments
% \let\meta_handle_reusable_graphic\thirdofthreearguments}
%
% but ... we want this too:
%
% \startuseMPgraphic{x}
% draw textext("\externalfigure[foo.pdf]") ;
% \stopuseMPgraphic
%
% \useMPgraphic{x}
%
% so we cannot overload unless we let back to the original meanings each graphic
% ... a better solution is:
\def\includeMPgraphic#1% gets expanded !
{\ifcsname\??mpgraphic#1\endcsname
\doubleexpandafter\fourthoffourarguments\lastnamedcs ; % ; is safeguard
\fi}
\let\meta_enable_include\relax
%D Drawings (stepwise built):
\newif\ifMPdrawingdone \MPdrawingdonefalse
\unexpanded\def\finalizeMPdrawing
{\MPdrawingdonetrue}
\let\MPdrawingdata\empty
\unexpanded\def\resetMPdrawing
{\glet\MPdrawingdata\empty
\global\MPdrawingdonefalse}
\unexpanded\def\pushMPdrawing
{\globalpushmacro\MPdrawingdata
\glet\MPdrawingdata\empty}
\unexpanded\def\popMPdrawing
{\globalpopmacro\MPdrawingdata}
\unexpanded\def\getMPdrawing
{\ifMPdrawingdone
\expandafter\meta_process_graphic\expandafter{\MPdrawingdata}% is this expansion still needed?
\fi}
\def\startMPdrawing
{\dosingleempty\meta_start_drawing}
\def\meta_start_drawing[#1]#2\stopMPdrawing
{\relax
\bgroup
\meta_enable_include
\doifelse{#1}{-}{\convertargument#2\to\asciia}{\def\asciia{#2}}%
\xdef\MPdrawingdata{\MPdrawingdata\asciia}%
\egroup}
\let\stopMPdrawing\relax
\def\MPdrawing#1%
{\relax
\bgroup
\meta_enable_include
\xdef\MPdrawingdata{\MPdrawingdata#1}%
\egroup}
\unexpanded\def\startMPclip#1#2\stopMPclip % todo: store at the lua end or just store less
{\setgvalue{\??mpclip#1}{#2}}
\let\stopMPclip\relax
\unexpanded\def\meta_grab_clip_path#1#2#3#4% #4 is alternative (called in backend code)
{\begingroup
\edef\width {#2}% \let\overlaywidth \width
\edef\height{#3}% \let\overlayheight\height
\d_overlay_width #2\onebasepoint
\d_overlay_height#3\onebasepoint
\edef\currentMPclip{#1}%
\ifcsname\??mpclip\currentMPclip\endcsname
\meta_grab_clip_path_indeed
\ifx\MPclippath\empty
\xdef\MPclippath{#4}%
\fi
\else
\xdef\MPclippath{#4}%
\fi
\endgroup}
\def\meta_grab_clip_path_indeed
{\meta_start_current_graphic
\normalexpanded{\noexpand\clf_mpsetclippath
instance {\currentMPinstance}%
format {\currentMPformat}%
data {\csname\??mpclip\currentMPclip\endcsname}%
initializations {\meta_flush_current_initializations}%
useextensions {\MPinstanceparameter\s!extensions}%
inclusions {\meta_flush_current_inclusions}%
method {\MPinstanceparameter\c!method}%
\relax}%
\meta_stop_current_graphic}
%D Since we want lables to follow the document settings, we also set the font
%D related variables.
\unexpanded\def\MPfontsizehskip#1%
{\dontleavehmode
\begingroup
\definedfont[#1]%
\hskip\clf_currentdesignsize\scaledpoint\relax
\endgroup}
\definefontsynonym[MetafunDefault][Regular*default]
\startMPinitializations % scale is not yet ok
defaultfont:="\truefontname{MetafunDefault}";
% defaultscale:=\the\bodyfontsize/10pt; % only when hard coded 10pt
% defaultscale:=1;
\stopMPinitializations
%D A signal that we're in combined \CONTEXT||\METAFUN mode:
\startMPextensions
string contextversion;
contextversion:="\contextversion"; % expanded
minute:=\the\normaltime mod 60;
hour:=\the\normaltime div 60;
year:=\the\normalyear;
month:=\the\normalmonth;
\stopMPextensions
%D \macros
%D {setupMPvariables}
%D
%D When we build collections of \METAPOST\ graphics, like background and buttons,
%D the need for passing settings arises. By (mis|)|using the local prefix that
%D belongs to \type {\framed}, we get a rather natural interface to backgrounds. To
%D prevent conflicts, we will use the \type {-} in \METAPOST\ specific variables,
%D like:
%D
%D \starttyping
%D \setupMPvariables[meta:button][size=20pt]
%D \stoptyping
% \lineheight 2pt 2 \scratchcounter red 0.4 .5\bodyfontsize
%
% see cont-loc for test code
%D Currently the inheritance of backgrounds does not work and we might drop it
%D anyway (too messy)
\newbox\b_meta_variable_box
\let \currentmpvariableclass \empty
\let \m_meta_current_variable \empty
\let \m_meta_current_variable_template\empty
\installcorenamespace{graphicvariable}
\def\meta_prepare_variable_default{\MPcolor{black}} % just to be sure we use a color but ...
\unexpanded\def\setupMPvariables
{\dodoubleempty\meta_setup_variables}
\def\meta_setup_variables[#1][#2]%
{\ifsecondargument
\getrawparameters[\??graphicvariable#1:][#2]%
\else
\getrawparameters[\??graphicvariable:][#1]%
\fi}
\unexpanded\def\presetMPvariable
{\dodoubleargument\meta_preset_variable}
\def\meta_preset_variable[#1][#2=#3]%
{\ifcsname\??graphicvariable#1:#2\endcsname \else
\setvalue{\??graphicvariable#1:#2}{#3}%
\fi}
\def\MPrawvar#1#2% no checking
{\begincsname\??graphicvariable#1:#2\endcsname}
\def\MPvariable#1% todo: could be a framed chain
{\begincsname\??graphicvariable\currentmpvariableclass:#1\endcsname}
\unexpanded\def\useMPvariables
{\dodoubleargument\meta_use_variables}
\def\meta_use_variables[#1][#2]%
{\edef\currentmpvariableclass{#1}%
\meta_prepare_variables{#2}}
\unexpanded\def\meta_prepare_variables#1%
{\processcommalist[#1]\meta_prepare_variable}
\unexpanded\def\meta_prepare_variable#1%
{\edef\m_meta_current_variable_template
{\??graphicvariable\currentmpvariableclass:#1}%
\edef\m_meta_current_variable
{\ifcsname\m_meta_current_variable_template\endcsname
\lastnamedcs
\fi}%
\ifx\m_meta_current_variable\empty
\expandafter\meta_prepare_variable_nop
\else
\expandafter\meta_prepare_variable_yes
\fi}
\unexpanded\def\meta_prepare_instance_variables
{\expandafter\processcommalist\expandafter[\m_meta_instance_variables]\meta_prepare_instance_variable}
\unexpanded\def\meta_prepare_instance_variable#1%
{\edef\m_meta_current_variable_template
{\??graphicvariable\currentmpvariableclass:#1}%
\edef\m_meta_current_variable
{\ifcsname\m_meta_current_variable_template\endcsname
\lastnamedcs
\else\ifcsname\??graphicvariable\currentMPgraphicname:#1\endcsname
\lastnamedcs
\fi\fi}%
\ifx\m_meta_current_variable\empty
\expandafter\meta_prepare_variable_nop
\else
\expandafter\meta_prepare_variable_yes
\fi}
\def\meta_prepare_variable_nop
{\expandafter \let\csname\m_meta_current_variable_template\endcsname\meta_prepare_variable_default}
\def\meta_prepare_variable_color
{\expandafter\edef\csname\m_meta_current_variable_template\endcsname{\MPcolor\m_meta_current_variable}}
\def\meta_prepare_variable_number
{\expandafter\edef\csname\m_meta_current_variable_template\endcsname{\number\m_meta_current_variable}}% also accepts 0.number
\def\meta_prepare_variable_dimension
{\expandafter\edef\csname\m_meta_current_variable_template\endcsname{\the\dimexpr\m_meta_current_variable}}
\startmkivmode
\def\meta_prepare_variable_yes
{\defconvertedcommand\ascii\m_meta_current_variable % otherwise problems
\doifelsecolor \ascii % with 2\bodyfontsize
{\meta_prepare_variable_color}
{\begingroup
\setbox\b_meta_variable_box\hpack{\scratchdimen\m_meta_current_variable sp}%
\ifzeropt\wd\b_meta_variable_box
\endgroup\meta_prepare_variable_number
\else
\endgroup\meta_prepare_variable_dimension
\fi}}
\stopmkivmode
\startlmtxmode
\def\meta_prepare_variable_yes
{\ifchkdim\m_meta_current_variable\or
\meta_prepare_variable_dimension
\else\ifchknum\m_meta_current_variable\or
\meta_prepare_variable_number
\else
\doifelsecolor\m_meta_current_variable
\meta_prepare_variable_color
\meta_prepare_variable_dimension
\fi\fi}
\stoplmtxmode
% \def\meta_prepare_variable_yes
% {\expandafter\edef\csname\m_meta_current_variable_template\endcsname
% {\clf_prepareMPvariable {\m_meta_current_variable}}}
\let\MPvar \MPvariable
\let\setMPvariables\setupMPvariables
%D \macros
%D {startuniqueMPgraphic, uniqueMPgraphic}
%D
%D This macros is probably of most use to myself, since I like to use graphics that
%D adapt themselves. The next \METAPOST\ kind of graphic is both unique and reused
%D when possible.
%D
%D \starttyping
%D \defineoverlay[example][\uniqueMPgraphic{test}]
%D
%D \startuniqueMPgraphic {test}
%D draw unitsquare xscaled \overlaywidth yscaled \overlayheight ;
%D \stopuniqueMPgraphic
%D \stoptyping
\def\overlaystamp % watch the \MPcolor, since colors can be redefined
{\the\d_overlay_width :%
\the\d_overlay_height :%
\the\d_overlay_depth :%
\the\d_overlay_offset :%
\the\d_overlay_linewidth:%
\MPcolor\overlaycolor :% % todo, expand once \m_overlaycolor
\MPcolor\overlaylinecolor} % todo, expand once \m_overlaylinecolor
%D A better approach is to let additional variables play a role in determining the
%D uniqueness. In the next macro, the second, optional, argument is used to
%D guarantee the uniqueness, as well as prepare variables for passing them to
%D \METAPOST.
%D
%D \starttyping
%D \startuniqueMPgraphic{meta:hash}{gap,angle,...}
%D \stoptyping
%D
%D The calling macro also accepts a second argument. For convenient use in overlay
%D definitions, we use \type {{}} instead of \type {[]}.
%D
%D \starttyping
%D \uniqueMPgraphic{meta:hash}{gap=10pt,angle=30}
%D \stoptyping
\newcount\c_meta_object_counter
\newbox \b_meta_graphic
% hm, isn't this already done elsewhere?
\unexpanded\def\meta_obey_box_depth
{\setbox\b_meta_graphic\hpack\bgroup
\raise\MPlly\box\b_meta_graphic
\egroup}
\unexpanded\def\meta_ignore_box_depth
{\normalexpanded
{\meta_obey_box_depth % hence the \unexpanded
\wd\b_meta_graphic\the\wd\b_meta_graphic
\ht\b_meta_graphic\the\ht\b_meta_graphic
\dp\b_meta_graphic\the\dp\b_meta_graphic}}
\unexpanded\def\meta_obey_box_origin
{\setbox\b_meta_graphic\hpack\bgroup
\kern\MPllx\raise\MPlly\box\b_meta_graphic
\egroup}
\unexpanded\def\obeyMPboxdepth {\let\meta_relocate_box\meta_obey_box_depth }
\unexpanded\def\ignoreMPboxdepth{\let\meta_relocate_box\meta_ignore_box_depth}
\unexpanded\def\obeyMPboxorigin {\let\meta_relocate_box\meta_obey_box_origin }
\unexpanded\def\normalMPboxdepth{\let\meta_relocate_box\relax }
\let\meta_relocate_box\relax
\unexpanded\def\meta_place_graphic % the converter also displaces so in fact we revert
{\meta_relocate_box
\box\b_meta_graphic}
\unexpanded\def\meta_reuse_box#1#2#3#4#5% space delimiting would save some tokens
{\MPllx#2\MPlly#3\MPurx#4\MPury#5%
\hpack{\forcecolorhack\getobject{MP}{#1}}} % else no proper color intent
\unexpanded\def\meta_use_box
{\setunreferencedobject{MP}}
\def\meta_handle_unique_graphic#1#2#3% when there are too many, we can store data at the lua end, although,
{\begingroup % when there are that many they're probably not that unique anyway
\edef\currentmpvariableclass{#1}%
\extendMPoverlaystamp{#2}% incl prepare
\ifcsname\??mpgraphic\overlaystamp:#1\endcsname
\lastnamedcs
\else
\meta_enable_include % redundant
\global\advance\c_meta_object_counter\plusone
\meta_use_box{\number\c_meta_object_counter}\hpack{\meta_process_graphic{#3}}% was vbox, graphic must end up as hbox
\setxvalue{\??mpgraphic\overlaystamp:#1}{\meta_reuse_box{\number\c_meta_object_counter}{\the\MPllx}{\the\MPlly}{\the\MPurx}{\the\MPury}}%
\csname\??mpgraphic\overlaystamp:#1\endcsname\empty
\fi
\endgroup}
\unexpanded\def\startuniqueMPgraphic
{\dodoublegroupempty\meta_start_unique_graphic}
\def\meta_start_unique_graphic#1%
{\normalexpanded{\meta_start_unique_graphic_indeed{#1}}}
\unexpanded\def\meta_start_unique_graphic_indeed#1#2#3\stopuniqueMPgraphic
{\setgvalue{\??mpgraphic#1}{\meta_handle_unique_graphic{#1}{#2}{#3}}}
\let\stopuniqueMPgraphic\relax
\unexpanded\def\uniqueMPgraphic
{\dodoublegroupempty\meta_unique_graphic}
\def\meta_unique_graphic#1#2%
{\meta_begin_graphic_group{#1}%
% \setupMPvariables[\currentMPgraphicname][#2]%
\setupMPvariables[#1][#2]%
\csname\??mpgraphic#1\endcsname\empty
\meta_end_graphic_group}
\def\meta_handle_use_graphic#1#2#3%
{\begingroup
\edef\currentmpvariableclass{#1}%
\edef\m_meta_instance_variables{#2}%
\ifx\m_meta_instance_variables\empty \else
\meta_prepare_instance_variables
\fi
\meta_enable_include % redundant
\meta_process_graphic{#3}%
\endgroup}
\unexpanded\def\startuseMPgraphic
{\dodoublegroupempty\meta_start_use_graphic}
% \def\meta_start_use_graphic#1#2#3\stopuseMPgraphic
% {\setgvalue{\??mpgraphic#1}{\meta_handle_use_graphic{#1}{#2}{#3}}}
%
% better, expansion of #1:
%
% \def\meta_start_use_graphic#1#2#3\stopuseMPgraphic
% %{\setgvalue{\??mpgraphic#1}{\meta_handle_use_graphic{#1}{#2}{#3}}}
% %{\setxvalue{\??mpgraphic#1}{\noexpand\meta_handle_use_graphic{#1}{\normalunexpanded{#2}}{\normalunexpanded{#3}}}}
% {\expandafter\gdef\csname\??mpgraphic#1\expandafter\endcsname\expandafter{\expandafter\meta_handle_use_graphic\expandafter{\normalexpanded{#1}}{#2}{#3}}}
%
% cleaner:
\def\meta_start_use_graphic#1%
{\normalexpanded{\meta_start_use_graphic_indeed{#1}}}
\unexpanded\def\meta_start_use_graphic_indeed#1#2#3\stopuseMPgraphic
{\setgvalue{\??mpgraphic#1}{\meta_handle_use_graphic{#1}{#2}{#3}}}
\let\stopuseMPgraphic\relax
\unexpanded\def\startusableMPgraphic % redundant but handy
{\dodoublegroupempty\meta_start_usable_graphic}
% \def\meta_start_usable_graphic#1#2#3\stopusableMPgraphic
% {\setgvalue{\??mpgraphic#1}{\meta_handle_use_graphic{#1}{#2}{#3}}}
\def\meta_start_usable_graphic#1%
{\normalexpanded{\meta_start_usable_graphic_indeed{#1}}}
\unexpanded\def\meta_start_usable_graphic_indeed#1#2#3\stopusableMPgraphic
{\setgvalue{\??mpgraphic#1}{\meta_handle_use_graphic{#1}{#2}{#3}}}
\let\stopusableMPgraphic\relax
\def\meta_handle_reusable_graphic#1#2#3%
{\begingroup
\edef\currentmpvariableclass{#1}%
\edef\m_meta_instance_variables{#2}%
\ifx\m_meta_instance_variables\empty \else
\meta_prepare_instance_variables
\fi
\meta_enable_include % redundant
\global\advance\c_meta_object_counter\plusone
\meta_use_box{\number\c_meta_object_counter}\hpack{\meta_process_graphic{#3}}% was vbox, graphic must end up as hbox
\setxvalue{\??mpgraphic#1}{\meta_reuse_box{\number\c_meta_object_counter}{\the\MPllx}{\the\MPlly}{\the\MPurx}{\the\MPury}}%
\csname\??mpgraphic#1\endcsname\empty
\endgroup}
\unexpanded\def\startreusableMPgraphic
{\dodoublegroupempty\meta_start_reusable_graphic}
% \def\meta_start_reusable_graphic#1#2#3\stopreusableMPgraphic
% {\setgvalue{\??mpgraphic#1}{\meta_handle_reusable_graphic{#1}{#2}{#3}}}
\def\meta_start_reusable_graphic#1%
{\normalexpanded{\meta_start_reusable_graphic_indeed{#1}}}
\unexpanded\def\meta_start_reusable_graphic_indeed#1#2#3\stopreusableMPgraphic
{\setgvalue{\??mpgraphic#1}{\meta_handle_reusable_graphic{#1}{#2}{#3}}}
\let\stopreusableMPgraphic\relax
\unexpanded\def\useMPgraphic
{\dodoublegroupempty\meta_use_graphic}
% \def\meta_use_graphic#1#2%
% {\meta_begin_graphic_group{#1}%
% %\doifsomething{#2}{\setupMPvariables[\currentMPgraphicname][#2]}%
% \doifsomething{#2}{\setupMPvariables[#1][#2]}%
% \csname\??mpgraphic#1\endcsname\empty
% \meta_end_graphic_group}
\def\meta_use_graphic#1#2%
{\meta_begin_graphic_group{#1}%
\ifcsname\??mpgraphic#1\endcsname
\edef\usedMPgraphicname{#1}%
\else\ifcsname\??mpgraphic\currentMPgraphicname\endcsname
\let\usedMPgraphicname\currentMPgraphicname
\else
\let\usedMPgraphicname\empty
\fi\fi
\ifx\usedMPgraphicname\empty
% message
\else
\doifsomething{#2}{\setupMPvariables[\usedMPgraphicname][#2]}%
\csname\??mpgraphic\usedMPgraphicname\endcsname
\fi
\meta_end_graphic_group}
\let\reuseMPgraphic \useMPgraphic % we can save a setup here if needed
\let\reusableMPgraphic\reuseMPgraphic % we can save a setup here if needed
%D \macros
%D {startuniqueMPpagegraphic,uniqueMPpagegraphic}
%D
%D Experimental.
\def\m_meta_page_prefix{\doifelseoddpage oe}
% \def\overlaypagestamp
% {\m_meta_page_prefix:\overlaywidth:\overlayheight:\overlaydepth:\MPcolor\overlaycolor:\MPcolor\overlaylinecolor}
\def\overlaypagestamp
{\m_meta_page_prefix :%
\the\d_overlay_width :%
\the\d_overlay_height :%
\the\d_overlay_depth :%
\the\d_overlay_offset :%
\the\d_overlay_linewidth:%
\MPcolor\overlaycolor :%
\MPcolor\overlaylinecolor}
\unexpanded\def\startuniqueMPpagegraphic
{\dodoublegroupempty\meta_start_unique_page_graphic}
% \def\meta_start_unique_page_graphic#1#2#3\stopuniqueMPpagegraphic % inefficient, double storage
% {\setgvalue{\??mpgraphic o:#1}{\meta_handle_unique_graphic{o:#1}{#2}{#3}}% % but these also keep the state
% \setgvalue{\??mpgraphic e:#1}{\meta_handle_unique_graphic{e:#1}{#2}{#3}}} % and meaning will be redefined
\def\meta_start_unique_page_graphic#1%
{\normalexpanded{\meta_start_unique_page_graphic_indeed{#1}}}
\unexpanded\def\meta_start_unique_page_graphic_indeed#1#2#3\stopuniqueMPpagegraphic % inefficient, double storage
{\setgvalue{\??mpgraphic o:#1}{\meta_handle_unique_graphic{o:#1}{#2}{#3}}% % but these also keep the state
\setgvalue{\??mpgraphic e:#1}{\meta_handle_unique_graphic{e:#1}{#2}{#3}}} % and meaning will be redefined
\let\stopuniqueMPpagegraphic\relax
\unexpanded\def\uniqueMPpagegraphic
{\dodoublegroupempty\meta_unique_page_graphic}
\def\meta_unique_page_graphic#1#2%
{\meta_begin_graphic_group{#1}%
\let\overlaystamp\overlaypagestamp
% \setupMPvariables[\m_meta_page_prefix:\currentMPgraphicname][#2]% prefix is new here
\setupMPvariables[\m_meta_page_prefix:#1][#2]% prefix is new here
\csname\??mpgraphic\m_meta_page_prefix:#1\endcsname\empty
\meta_end_graphic_group}
%D One way of defining a stamp is:
%D
%D \starttyping
%D \def\extendMPoverlaystamp#1%
%D {\def\docommand##1%
%D {\edef\overlaystamp{\overlaystamp:\MPvariable{##1}}}%
%D \processcommalist[#1]\docommand}
%D \stoptyping
%D
%D Since we need to feed \METAPOST\ with expanded dimensions, we introduce a
%D dedicated expansion engine. We redefine \type {\extendMPoverlaystamp} to
\unexpanded\def\extendMPoverlaystamp#1%
{\processcommalist[#1]\meta_extend_overlay_stamp}
\def\meta_extend_overlay_stamp#1%
{\meta_prepare_instance_variable{#1}%
\edef\overlaystamp{\overlaystamp:\MPvariable{#1}}}
\unexpanded\def\getMPdata {\clf_getMPdata}
\let\rawMPdata \clf_getMPdata
\unexpanded\def\getMPstored{\clf_getMPstored}
\let\rawMPstored \clf_getMPstored
%D We need this trick because we need to make sure that the tex scanner sees
%D newlines and does not quit. Also, we do need to flush the buffer under a normal
%D catcode regime in order to expand embedded tex macros. As usual with buffers,
%D \type {#1} can be a list.
\unexpanded\def\processMPbuffer
{\dosingleempty\meta_process_buffer}
\def\meta_process_buffer[#1]%
{\meta_begin_graphic_group{#1}%
\meta_process_graphic{\clf_feedback{\currentMPgraphicname}}%
\meta_end_graphic_group}
\unexpanded\def\runMPbuffer
{\dosingleempty\meta_run_buffer}
\def\meta_run_buffer[#1]% processing only
{\startnointerference\meta_process_buffer[#1]\stopnointerference}
%D \macros
%D {startMPenvironment, resetMPenvironment}
%D
%D In order to synchronize the main \TEX\ run and the runs local to \METAPOST,
%D environments can be passed.
\unexpanded\def\startMPenvironment
{\begingroup
\catcode\endoflineasciicode \ignorecatcode
\dosingleempty\meta_start_environment}
\def\meta_start_environment[#1]#2\stopMPenvironment
{\endgroup
\edef\m_meta_option{#1}
\ifx\m_meta_option\s!reset
\resetMPenvironment % reset mp toks
\else\ifx\m_meta_option\v!global
#2% % use in main doc too
\else\ifx\m_meta_option\!!plustoken
#2% % use in main doc too
\fi\fi\fi
\clf_mptexset{\detokenize{#2}}}
\let\stopMPenvironment\relax
\unexpanded\def\resetMPenvironment
{\clf_mptexreset}
\unexpanded\def\useMPenvironmentbuffer[#1]%
{\clf_mptexsetfrombuffer{#1}}
%D This command takes \type {[reset]} as optional argument.
%D
%D \starttyping
%D \startMPenvironment
%D \setupbodyfont[pos,14.4pt]
%D \stopMPenvironment
%D
%D \startMPcode
%D draw btex \sl Hans Hagen etex scaled 5 ;
%D \stopMPcode
%D \stoptyping
%D
%D The most simple case:
\unexpanded\def\startMPcode
{\dosinglegroupempty\meta_start_code}
\def\meta_start_code
{\iffirstargument
\expandafter\meta_start_code_instance
\else
\expandafter\meta_start_code_standard
\fi}
\def\meta_start_code_instance#1#2\stopMPcode
{\begingroup
\edef\currentMPinstance{#1}%
\let\currentMPgraphicname\empty
\edef\currentMPformat{\MPinstanceparameter\s!format}%
\meta_enable_include
\meta_process_graphic{#2}%
\endgroup}
\def\meta_start_code_standard#1#2\stopMPcode
{\begingroup
\let\currentMPinstance\defaultMPinstance
\let\currentMPgraphicname\empty
\edef\currentMPformat{\MPinstanceparameter\s!format}%
\meta_process_graphic{#2}%
\endgroup}