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%D \module
%D [ file=mult-aux,
%D version=2010.08.2,
%D title=\CONTEXT\ Multilingual Macros,
%D subtitle=Definitions,
%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 A generalization of \MKIV-like inheritance. Just something to play
%D with (interface might change).
\unprotect
%D \starttyping
%D \unprotect
%D \def\????aa{@@@@aa}
%D
%D \installparameterhandler \????aa {whatever}
%D \installsetuphandler \????aa {whatever}
%D \installdefinehandler \????aa {whatever} \????aa % #3 == defaultroot
%D \installattributehandler \????aa {whatever}
%D
%D % \installcommandhandler \????aa {whatever} \????aa
%D \protect
%D
%D % \whateverparameter \c!test
%D % \whateverparameterhash \c!test
%D % \namedwhateverparameter \mycurrentwhatever \c!test
%D % \dosetwhateverattributes \c!style \c!color
%D % \everydefinewhatever (sets \currentwhatever)
%D % \everypresetwhatever (can be used to reset parameters as we can redefine)
%D % \everysetupwhatever (sets \currentwhatever)
%D
%D \starttext
%D \definewhatever[first] \definewhatever[second][first]
%D test: \def\currentwhatever{first} \whateverparameter{method} \par
%D \setupwhatever [method=unset] test: \def\currentwhatever{first} \whateverparameter{method} \par
%D \setupwhatever[first] [method=first] test: \def\currentwhatever{first} \whateverparameter{method} \par
%D test: \def\currentwhatever{second} \whateverparameter{method} \par
%D \setupwhatever[second][method=second] test: \def\currentwhatever{second} \whateverparameter{method} \par
%D \stoptext
%D \stoptyping
% problem: every* could clash
% faster but assumes \c!always
%
% \unexpanded\def\doinstallparameterhandler#1#2#3#4#5#6#7#8#9% \??aa {whatever} \current..
% {\def#3##1{\csname#6{#1#2}##1\endcsname}%
% \def#4##1{#7{#1#2}##1}%
% \def#5##1##2{\csname#6{#1##2}##1\endcsname}%
% \def#6##1##2{\ifcsname##1##2\endcsname##1##2\else\expandafter#8\csname##1\s!parent\endcsname##2\fi}%
% \def#7##1##2{\ifcsname##1##2\endcsname ##1\else\expandafter#9\csname##1\s!parent\endcsname##2\fi}%
% \def#8##1##2{\ifx##1\relax\s!empty\else#6{##1}##2\fi}%
% \def#9##1##2{\ifx##1\relax \else#7{##1}##2\fi}}
\unexpanded\def\doinstallparameterhandler#1#2#3#4#5#6#7#8#9% \??aa {whatever} \current..
{\def#3##1{\csname#6{#1#2}{##1}\endcsname}%
\def#4##1{#7{#1#2}{##1}}%
\def#5##1##2{\csname#6{#1##1}{##2}\endcsname}%
\def#6##1##2{\ifcsname##1##2\endcsname##1##2\else\expandafter#8\csname##1\s!parent\endcsname{##2}\fi}%
\def#7##1##2{\ifcsname##1##2\endcsname ##1\else\expandafter#9\csname##1\s!parent\endcsname{##2}\fi}%
\def#8##1##2{\ifx##1\relax\s!empty\else#6{##1}{##2}\fi}%
\def#9##1##2{\ifx##1\relax \else#7{##1}{##2}\fi}}
% todo: \def\detokenized...parameter#1{\detokenize\expandafter\expandafter\expandafter{\csname#1#2\endcsname}} % always root
\def\installparameterhandler#1#2%
{\normalexpanded
{\doinstallparameterhandler
{\noexpand#1}% \??aa
\expandafter\noexpand\csname current#2\endcsname
\expandafter\noexpand\csname #2parameter\endcsname % can move
\expandafter\noexpand\csname #2parameterhash\endcsname % can move
\expandafter\noexpand\csname named#2parameter\endcsname % can move
\expandafter\noexpand\csname do#2parameter\endcsname
\expandafter\noexpand\csname do#2parameterhash\endcsname
\expandafter\noexpand\csname do#2parentparameter\endcsname
\expandafter\noexpand\csname do#2parentparameterhash\endcsname}}
% faster but assumes \c!always
%
% \unexpanded\def\doinstallattributehandler#1#2#3% #1 not used here
% {\expandafter\def\csname doset#2attributes\endcsname##1##2% style color
% {\edef\fontattributehash {#3##1}%
% \edef\colorattributehash{#3##2}%
% \ifx\fontattributehash \empty\else\dosetfontattribute \fontattributehash ##1\fi
% \ifx\colorattributehash\empty\else\dosetcolorattribute\colorattributehash##2\fi}}
\unexpanded\def\doinstallattributehandler#1#2#3% #1 not used here
{\expandafter\def\csname doset#2attributes\endcsname##1##2% style color
{\edef\fontattributehash {#3{##1}}%
\edef\colorattributehash{#3{##2}}%
\ifx\fontattributehash \empty\else\dosetfontattribute \fontattributehash {##1}\fi
\ifx\colorattributehash\empty\else\dosetcolorattribute\colorattributehash{##2}\fi}}
\def\installattributehandler#1#2%
{\normalexpanded
{\doinstallattributehandler
{\noexpand#1}% \??aa
{\noexpand#2}% whatever
\expandafter\noexpand\csname #2parameterhash\endcsname}}
\unexpanded\def\doinstalldefinehandler#1#2#3#4#5#6#7%
{\unexpanded\expandafter\def\csname define#2\endcsname{\dodoubleempty#5}%
\expandafter\newtoks\csname everydefine#2\endcsname
\def#5[##1][##2]%
{\edef#4{##1}%
\the#6% predefine
\ifsecondargument
\getparameters[#1#4][\s!parent=#1,##2]%
\else
\getparameters[#1#4][\s!parent=#3]%
\fi
\the#7}}
\def\installdefinehandler#1#2#3%
{\normalexpanded
{\doinstalldefinehandler
{\noexpand#1}% \??aa
{#2}% whatever
{#3}% root
\expandafter\noexpand\csname current#2\endcsname
\expandafter\noexpand\csname dodefine#2\endcsname
\expandafter\noexpand\csname everypreset#2\endcsname
\expandafter\noexpand\csname everydefine#2\endcsname}}
\unexpanded\def\doinstallsetuphandler#1#2#3#4#5%
{\unexpanded\expandafter\def\csname setup#2\endcsname{\dodoubleempty#4}%
\expandafter\newtoks\csname everysetup#2\endcsname
\def#4[##1][##2]%
{\ifsecondargument
\def\docommand####1% we will have a simple one as well
{\edef#3{##1#1}%
\getparameters[#1#3][##2]%
\the#5}%
\processcommalist[##1]\docommand
\else
\let#3\empty
\getparameters[#1][##1]%
\the#5%
\fi}}
\def\installsetuphandler#1#2%
{\normalexpanded
{\doinstallsetuphandler
{\noexpand#1}% \??aa
{#2}% whatever
\expandafter\noexpand\csname current#2\endcsname
\expandafter\noexpand\csname dosetup#2\endcsname
\expandafter\noexpand\csname everysetup#2\endcsname}}
\def\installcommandhandler#1#2#3% \??self name \??parent (can be \??self)
{\installparameterhandler{#1}{#2}%
\installdefinehandler {#1}{#2}#3%
\installsetuphandler {#1}{#2}%
\installattributehandler{#1}{#2}}
\protect
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