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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}{}
%D \macros
%D {setobject,getobject,ifinobject}
%D
%D Boxes can be considered reuable objects. Traditionally once passed
%D to the \DVI\ file, such objects cannot be reused. In \PDF\ however,
%D reusing is possible and sometimes even a necessity. Therefore,
%D \CONTEXT\ supports reusable objects and \LUATEX\ has native support
%D for so called box resources.
%D
%D The first application of objects in \CONTEXT\ concerned \METAPOST\
%D graphics and fill||in form fields. Reusing resources can save lots
%D of bytes and sometimes also 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.
%D Although the implementation in \MKIV\ is somewhat different the
%D principles have not changed.
\installcorenamespace {objects}
\newif \ifinobject
\newbox \objectbox
\def\objectoffset{1cm}
\newdimen\objectoff \def\objectmargin{\the\objectoff}
\newdimen\objectwd \def\objectwidth {\the\objectwd}
\newdimen\objectht \def\objectheight{\the\objectht}
\newdimen\objectdp \def\objectdepth {\the\objectdp}
%D If I have time I will use the unreferenced variant for e.g. mp reuse. This can be
%D rewritten in \LUA\ anyway.
\unexpanded\def\setreferencedobject #1#2{\begingroup\synctexpause\objectoff\objectoffset\inobjecttrue\dowithnextbox{\pack_objects_set_yes{#1}{#2}}}
\unexpanded\def\settightreferencedobject #1#2{\begingroup\synctexpause\objectoff\zeropoint \inobjecttrue\dowithnextbox{\pack_objects_set_yes{#1}{#2}}}
\unexpanded\def\setunreferencedobject #1#2{\begingroup\synctexpause\objectoff\objectoffset\inobjecttrue\dowithnextbox{\pack_objects_set_nop{#1}{#2}}}
\unexpanded\def\settightunreferencedobject#1#2{\begingroup\synctexpause\objectoff\zeropoint \inobjecttrue\dowithnextbox{\pack_objects_set_nop{#1}{#2}}}
\let\setobject \setreferencedobject
\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
\unexpanded\def\pack_objects_set_yes#1#2%
{\ifcase\c_pack_objects_offset_mode
\ifzeropt\objectoff
\pack_objects_package_nop\nextbox
\else
\pack_objects_package_yes\nextbox
\fi
\else
\pack_objects_package_nop\nextbox
\fi
\clf_registerreferencedobject{#1}{#2}\objectbox\objectoff\c_pack_objects_offset_mode
\synctexresume
\endgroup}
\unexpanded\def\pack_objects_set_nop#1#2%
{\ifcase\c_pack_objects_offset_mode
\ifzeropt\objectoff
\pack_objects_package_nop\nextbox
\else
\pack_objects_package_yes\nextbox
\fi
\else
\pack_objects_package_nop\nextbox
\fi
\clf_registerobject{#1}{#2}\objectbox\objectoff\c_pack_objects_offset_mode
\synctexresume
\endgroup}
\def\pack_objects_package_nop#1% we pack because otherwise \ruledhbox is still tight
{\setbox\objectbox\hpack{\box#1}}
\def\pack_objects_package_yes#1%
{\objectwd\dimexpr\wd#1+2\objectoff\relax
\objectht\dimexpr\ht#1+ \objectoff\relax
\objectdp\dimexpr\dp#1+ \objectoff\relax
\setbox\objectbox\hpack
{\hskip\objectoff
\box#1}%
\wd\objectbox\objectwd
\ht\objectbox\objectht
\dp\objectbox\objectdp}
\unexpanded\def\getobject#1#2%
{\begingroup
\synctexpause
\clf_restoreobject{#1}{#2}%
\ifzeropt\objectoff\else
\objectoff-\objectoff
\pack_objects_package_yes\objectbox
\fi
\box\objectbox
\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}.
\unexpanded\def\getobjectdimensions#1#2%
{\clf_getobjectdimensions{#1}{#2}}
%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
\def\defaultobjectreference{0}
\def\defaultobjectpage {\realfolio}
\unexpanded\def\dogetobjectreference {\clf_getobjectreference}
\unexpanded\def\dogetobjectreferencepage {\clf_getobjectreferencepage}
\unexpanded\def\doifelseobjectfound {\clf_doifelseobject}
\unexpanded\def\doifelseobjectreferencefound{\clf_doifelseobjectreference}
\let\doifobjectfoundelse \doifelseobjectfound
\let\doifobjectreferencefoundelse\doifelseobjectreferencefound
%D For the moment here:
\let\lastpredefinedsymbol\empty % some day we can do more at the lua end
\unexpanded\def\predefinesymbol[#1]%
{\begingroup
\xdef\lastpredefinedsymbol{#1}%
\settightobject{SYM}{#1}\hbox{\symbol[#1]}% to be checked ... maybe only fitting
\dogetobjectreference{SYM}{#1}\m_back_object_reference
\clf_registerbackendsymbol{#1}\m_back_object_reference\relax
\endgroup}
\protect \endinput
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