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%D \module
%D [ file=pack-obj,
%D version=1998.01.15,
%D title=\CONTEXT\ Packaging Macros,
%D subtitle=Objects,
%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 Packaging Macros / Objects}
\unprotect
\registerctxluafile{pack-obj}{autosuffix}
%D \macros
%D {setobject,getobject,ifinobject}
%D
%D Boxes can be considered reuable objects. Traditionally once passed to the \DVI\
%D file, such objects cannot be reused. In \PDF\ however, reusing is possible and
%D sometimes even a necessity. Therefore, \CONTEXT\ supports reusable objects and
%D \LUATEX\ has native support for so called box resources.
%D
%D The first application of objects in \CONTEXT\ concerned \METAPOST\ graphics and
%D fill||in form fields. Reusing resources can save lots of bytes and sometimes also
%D runtime.
%D
%D \starttyping
%D \setobject{class}{name}\somebox{}
%D \getobject{class}{name}
%D \stoptyping
%D
%D Here \type {\somebox} can be whatever box specification suits \TEX. Although the
%D implementation in \MKIV\ is somewhat different the principles have not changed.
\installcorenamespace {objects}
\newif \ifinobject
\newbox \b_pack_objects
\mutable\def\objectoffset{1cm} % Still public but use with care!
\newdimen\d_pack_objects_offset \permanent\def\objectmargin{\the\d_pack_objects_offset}
\newdimen\d_pack_objects_width \permanent\def\objectwidth {\the\d_pack_objects_width}
\newdimen\d_pack_objects_height \permanent\def\objectheight{\the\d_pack_objects_height}
\newdimen\d_pack_objects_depth \permanent\def\objectdepth {\the\d_pack_objects_depth}
%D If I have time I will use the unreferenced variant for e.g. mp reuse. This can be
%D rewritten in \LUA\ anyway.
\permanent\protected\def\setreferencedobject #1#2{\begingroup\synctexpause\d_pack_objects_offset\objectoffset\inobjecttrue\dowithnextbox{\pack_objects_set_yes{#1}{#2}}}
\permanent\protected\def\settightreferencedobject #1#2{\begingroup\synctexpause\d_pack_objects_offset\zeropoint \inobjecttrue\dowithnextbox{\pack_objects_set_yes{#1}{#2}}}
\permanent\protected\def\setunreferencedobject #1#2{\begingroup\synctexpause\d_pack_objects_offset\objectoffset\inobjecttrue\dowithnextbox{\pack_objects_set_nop{#1}{#2}}}
\permanent\protected\def\settightunreferencedobject#1#2{\begingroup\synctexpause\d_pack_objects_offset\zeropoint \inobjecttrue\dowithnextbox{\pack_objects_set_nop{#1}{#2}}}
\aliased\let\setobject \setreferencedobject
\aliased\let\settightobject\settightreferencedobject
%D We can get subtle differences in boundingboxes but both methods work ok.
\newconstant\c_pack_objects_offset_mode % 0=tex 1=box
\protected\def\pack_objects_set_yes#1#2%
{\ifcase\c_pack_objects_offset_mode
\ifzeropt\d_pack_objects_offset
\pack_objects_package_nop\nextbox
\else
\pack_objects_package_yes\nextbox
\fi
\else
\pack_objects_package_nop\nextbox
\fi
\clf_registerreferencedobject{#1}{#2}\b_pack_objects\d_pack_objects_offset\c_pack_objects_offset_mode
\synctexresume
\endgroup}
\protected\def\pack_objects_set_nop#1#2%
{\ifcase\c_pack_objects_offset_mode
\ifzeropt\d_pack_objects_offset
\pack_objects_package_nop\nextbox
\else
\pack_objects_package_yes\nextbox
\fi
\else
\pack_objects_package_nop\nextbox
\fi
\clf_registerobject{#1}{#2}\b_pack_objects\d_pack_objects_offset\c_pack_objects_offset_mode
\synctexresume
\endgroup}
\def\pack_objects_package_nop#1% we pack because otherwise \ruledhbox is still tight
{\setbox\b_pack_objects\hpack{\box#1}}
\def\pack_objects_package_yes#1%
{\d_pack_objects_width \dimexpr\wd#1+2\d_pack_objects_offset\relax
\d_pack_objects_height\dimexpr\ht#1+ \d_pack_objects_offset\relax
\d_pack_objects_depth \dimexpr\dp#1+ \d_pack_objects_offset\relax
\setbox\b_pack_objects\hpack{\hskip\d_pack_objects_offset\box#1}%
\wd\b_pack_objects\d_pack_objects_width
\ht\b_pack_objects\d_pack_objects_height
\dp\b_pack_objects\d_pack_objects_depth}
\permanent\protected\def\getobject#1#2%
{\begingroup
\synctexpause
\clf_restoreobject{#1}{#2}%
\ifzeropt\d_pack_objects_offset\else
\d_pack_objects_offset-\d_pack_objects_offset
\pack_objects_package_yes\b_pack_objects
\fi
\box\b_pack_objects
\synctexresume
\endgroup}
%D If needed one can ask for the dimensions of an object with:
%D
%D \starttyping
%D \getobjectdimensions{class}{name}
%D \stoptyping
%D
%D The results are reported in \type {\objectwidth}, \type {\objectheight} and \type
%D {\objectdepth} as well as \type {\objectoffset}.
% \getobjectdimensions #1#2 % defined at the lua end
%D \macros
%D {doifobjectfoundelse,doifobjectreferencefoundelse}
%D
%D To prevent redundant definition of objects, one can use the next tests:
%D
%D \starttyping
%D \doifobjectfoundelse{class}{object}{do then}{do else}
%D \doifobjectreferencefoundelse{class}{object}{do then}{do else}
%D \stoptyping
\immutable\def\defaultobjectreference{0}
\immutable\def\defaultobjectpage {\realfolio}
% \getobjectreference {#1}{#2\csname % define at the lua end
% \getobjectreferencepage {#1}{#2\csname % define at the lua end
% \doifelseobjectfound {#1}{#2} % defined atthe lua end
% \doifelseobjectreferencefound {#1}{#2} % defined atthe lua end
\aliased\let\dogetobjectreference \getobjectreference % for now, will go away
\aliased\let\dogetobjectreferencepage\getobjectreferencepage % for now, will go away
\aliased\let\doifobjectfoundelse \doifelseobjectfound
\aliased\let\doifobjectreferencefoundelse\doifelseobjectreferencefound
%D For the moment here:
\mutable\let\lastpredefinedsymbol\empty % some day we can do more at the lua end
\permanent\protected\def\predefinesymbol[#1]%
{\begingroup
\xdef\lastpredefinedsymbol{#1}%
\settightobject{SYM}{#1}\hbox{\symbol[#1]}% to be checked ... maybe only fitting
\getobjectreference{SYM}{#1}\m_back_object_reference
\clf_registerbackendsymbol{#1}\m_back_object_reference\relax
\endgroup}
\protect \endinput
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