%D \module
%D   [       file=mult-aux,
%D        version=2010.08.2,
%D          title=\CONTEXT\ Multilingual Macros,
%D       subtitle=helpers,
%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.

%D A generalization of \MKIV-like inheritance. Just something to play
%D with (interface might change). The code here evolved in an email
%D exchange between me and Wolgang Schuster.

\writestatus{loading}{ConTeXt Multilingual Macros / Helpers}

\registerctxluafile{mult-aux}{1.001}

\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
%
% There can be less {} in the following definitions if we assume \??aa and \c!somecs
%
% todo: \def\detokenized...parameter#1{\detokenize\expandafter\expandafter\expandafter{\csname#1#2\endcsname}} % always root
%
% it might be more efficient to do this at the lua and
%
% watch the push/pop and predefinition of current .. this is needed for nested
% definitions and overloaded defines using the predefined one

\unexpanded\def\doinstallparameterhandler#1#2#3#4#5#6#7%
  {\ifx#2\relax\let#2\empty\fi
   \def#3##1{\csname#4{#1#2}{##1}\endcsname}%
   \def#4##1##2{\ifcsname##1##2\endcsname##1##2\else\expandafter#5\csname##1\s!parent\endcsname{##2}\fi}%
   \def#5##1##2{\ifx##1\relax\s!empty\else#4{##1}{##2}\fi}%
   \def#6##1##2{\csname#4{#1##1}{##2}\endcsname}%
   \def#7##1{\detokenize\expandafter\expandafter\expandafter{\csname#1##1\endcsname}}} % always root

\unexpanded\def\installparameterhandler#1#2%
  {\normalexpanded
     {\doinstallparameterhandler
        {\noexpand#1}% \??aa
        \expandafter\noexpand\csname current#2\endcsname
        \expandafter\noexpand\csname #2parameter\endcsname
        \expandafter\noexpand\csname do#2parameter\endcsname
        \expandafter\noexpand\csname do#2parentparameter\endcsname
        \expandafter\noexpand\csname named#2parameter\endcsname
        \expandafter\noexpand\csname detokenized#2parameter\endcsname}}

\unexpanded\def\doinstallparameterhashhandler#1#2#3#4#5%
  {\ifx#2\relax\let#2\empty\fi
   \def#3##1{#4{#1#2}{##1}}%
   \def#4##1##2{\ifcsname##1##2\endcsname##1\else\expandafter#5\csname##1\s!parent\endcsname{##2}\fi}%
   \def#5##1##2{\ifx##1\relax\else#4{##1}{##2}\fi}}

\unexpanded\def\installparameterhashhandler#1#2%
  {\normalexpanded
     {\doinstallparameterhashhandler
        {\noexpand#1}% \??aa
        \expandafter\noexpand\csname current#2\endcsname
        \expandafter\noexpand\csname #2parameterhash\endcsname
        \expandafter\noexpand\csname do#2parameterhash\endcsname
        \expandafter\noexpand\csname do#2parentparameterhash\endcsname}}

\unexpanded\def\doinstallparametersethandler#1#2#3#4#5%
  {\ifx#2\relax\let#2\empty\fi
   \def#3{\dosetvalue{#1#2}}%        ##1 {##2} (braces are mandate)
   \def#4{\doletvalue{#1#2}}%        ##1 ##2
   \def#5{\doletvalue{#1#2}\empty}}% ##1

\unexpanded\def\installparametersethandler#1#2%
  {\normalexpanded
     {\doinstallparametersethandler
        {\noexpand#1}% \??aa
        \expandafter\noexpand\csname current#2\endcsname
        \expandafter\noexpand\csname set#2parameter\endcsname
        \expandafter\noexpand\csname let#2parameter\endcsname
        \expandafter\noexpand\csname reset#2parameter\endcsname}}

\unexpanded\def\doinstallattributehandler#1#2#3% #1 not used here
  {\def#2##1##2% style color
     {\edef\fontattributehash {#3{##1}}% this name is public
      \edef\colorattributehash{#3{##2}}% this name is public
      \ifx\fontattributehash \empty\else\dosetfontattribute \fontattributehash {##1}\fi
      \ifx\colorattributehash\empty\else\dosetcolorattribute\colorattributehash{##2}\fi}}

\unexpanded\def\installattributehandler#1#2%
  {\normalexpanded
     {\doinstallattributehandler
        {\noexpand#1}% \??aa
        \expandafter\noexpand\csname doset#2attributes\endcsname
        \expandafter\noexpand\csname #2parameterhash\endcsname}}

\let\definehandlerparent\empty

\unexpanded\def\doinstalldefinehandler#1#2#3#4#5#6#7#8%
  {\ifx#4\relax\let#4\empty\fi
   \unexpanded\def#2{\dotripleempty#5}%
   \newtoks#6%
   \newtoks#7%
   \def#5[##1][##2][##3]% [child][parent][settings] | [child][settings] | [child][parent] | [child]
     {\let\saveddefinewhatever#4%
      \edef#4{##1}%
      \the#6% predefine
      \ifthirdargument
        \edef#8{##2}%
        \getparameters[#1#4][\s!parent=#1##2,##3]%
      \else\ifsecondargument
        \doifassignmentelse{##2}
          {\let#8\empty
           \getparameters[#1#4][\s!parent=#3,##2]}
          {\edef#8{##2}%
           \getparameters[#1#4][\s!parent=#1##2]}%
      \else
        \let#8\empty
        \getparameters[#1#4][\s!parent=#3]%
      \fi\fi
      \the#7%
      \let#4\saveddefinewhatever}}

\unexpanded\def\installdefinehandler#1#2#3%
  {\normalexpanded
     {\doinstalldefinehandler
        {\noexpand#1}% \??aa
        \expandafter\noexpand\csname define#2\endcsname
        {\noexpand#3}% root
        \expandafter\noexpand\csname current#2\endcsname
        \expandafter\noexpand\csname d@define#2\endcsname
        \expandafter\noexpand\csname everypreset#2\endcsname
        \expandafter\noexpand\csname everydefine#2\endcsname
        \expandafter\noexpand\csname current#2parent\endcsname}}

\unexpanded\def\doinstallsetuphandler#1#2#3#4#5#6%
  {\ifx#3\relax\let#3\empty\fi
   \unexpanded\def#2{\dodoubleempty#4}%
   \unexpanded\def#6{\getparameters[#1#3]}%
   \newtoks#5%
   \def#4[##1][##2]% maybe helper
     {\let\savedsetupwhatever#3%
      \ifsecondargument
        \def\docommand####1% we will have a simple one as well
          {\edef#3{####1}%
           \getparameters[#1#3][##2]%
           \the#5}%
        \processcommalist[##1]\docommand
      \else
        \let#3\empty
        \getparameters[#1][##1]%
        \the#5%
      \fi
      \let#3\savedsetupwhatever}}

\unexpanded\def\installsetuphandler#1#2%
  {\normalexpanded
     {\doinstallsetuphandler
        {\noexpand#1}% \??aa
        \expandafter\noexpand\csname setup#2\endcsname
        \expandafter\noexpand\csname current#2\endcsname
        \expandafter\noexpand\csname d@setup#2\endcsname
        \expandafter\noexpand\csname everysetup#2\endcsname
        \expandafter\noexpand\csname setupcurrent#2\endcsname}}

\unexpanded\def\doinstallswitchsetuphandler#1#2#3#4#5#6%
  {\ifx#3\relax\let#3\empty\fi
   \unexpanded\def#2{\dodoubleempty#4}%
   \unexpanded\def#6{\getparameters[#1#3]}%
   \newtoks#5%
   \def#4[##1][##2]% maybe helper
     {\ifsecondargument % no commalist here
        \let\savedsetupwhatever#3%
        \edef#3{##1}%
        \getparameters[#1#3][##2]%
        \the#5%
        \let#3\savedsetupwhatever
      \else\iffirstargument
        \doifassignmentelse{##1}
          {\let\savedsetupwhatever#3%
           \let#3\empty
           \getparameters[#1][##1]%
           \the#5%
           \let#3\savedsetupwhatever}
          {\edef#3{##1}% this will catch reset
           \the#5}%
      \else
        \let#3\empty
        \the#5%
      \fi\fi}}

\unexpanded\def\installswitchsetuphandler#1#2%
  {\normalexpanded
     {\doinstallswitchsetuphandler
        {\noexpand#1}% \??aa
        \expandafter\noexpand\csname setup#2\endcsname
        \expandafter\noexpand\csname current#2\endcsname
        \expandafter\noexpand\csname d@setup#2\endcsname
        \expandafter\noexpand\csname everysetup#2\endcsname
        \expandafter\noexpand\csname setupcurrent#2\endcsname}}

\unexpanded\def\installcommandhandler#1#2#3% \??self name \??parent (can be \??self)
  {\installparameterhandler    {#1}{#2}%
   \installparameterhashhandler{#1}{#2}%
   \installparametersethandler {#1}{#2}%
   \installdefinehandler       {#1}{#2}{#3}%
   \installsetuphandler        {#1}{#2}%
   \installattributehandler    {#1}{#2}}

\unexpanded\def\installswitchcommandhandler#1#2#3% \??self name \??parent (can be \??self)
  {\installparameterhandler    {#1}{#2}%
   \installparameterhashhandler{#1}{#2}%
   \installparametersethandler {#1}{#2}%
   \installdefinehandler       {#1}{#2}{#3}%
   \installswitchsetuphandler  {#1}{#2}%
   \installattributehandler    {#1}{#2}}

\unexpanded\def\installnamespace#1%
  {\setvalue{????#1}{@@@@#1}}

% \enabletrackers[interfaces.namespaces,context.flush]
%
% \definenamespace
%   [xy]
%   [type=module,
%    comment=test module,
%    version=1,
%    name=test,
%    style=yes,
%    command=yes,
%    setup=list,
%    set=yes,
%    parent=xy]
%
% \unprotect
% \getparameters
%   [\????xy]
%   [text=]
% \protect
%
% \definetest[one]
%
% \starttext
%
%   “\testparameter{text}”
%
%   \setuptest[text=foo]
%
%   “\testparameter{text}”
%
%   \setuptest[one][text=bar]
%
%   “\testparameter{text}”
%
% \stoptext

\unexpanded\def\definenamespace
  {\dodoubleargument\dodefinenamespace}

\def\dodefinenamespace[#1][#2]% namespace settings
  {\ctxlua{interfaces.namespaces.define(\!!bs#1\!!es,\!!bs#2\!!es)}}

\def\listnamespaces
  {\ctxlua{interfaces.namespaces.list()}}

%D Helper:
%D
%D \starttyping
%D \showparentchain{@@am}{left}
%D \stoptyping

\def\doshowparentchain#1%
  {#1 => %
   \ifcsname#1\s!parent\endcsname
      \expandafter\doshowparentchain\csname#1\s!parent\endcsname
   \fi}

\def\showparentchain#1#2%
  {\writestatus\m!system{chain: [ \doshowparentchain{#1#2}]}}

\protect