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%D \module
%D [ file=prop-ini,
%D version=2003.04.20,
%D title=\CONTEXT\ Property Macros,
%D subtitle=Initialization,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA / Hans Hagen \& Ton Otten}]
%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 Property Macros / initialization}
%D Welcome to the third alternative of this yet undocumented module,
%D which means that there is no public interface yet!
\unprotect
\newcount\propertylevel
\def\currentpropertylevel {\csname\??py:l:\currentpropertytype\endcsname} % counter
\def\previouspropertylevel{\csname\??py:p:\currentpropertytype\endcsname} % counter
\def\currentproperty {\csname\??py:c:\number\currentpropertylevel \endcsname} % string
\def\previousproperty {\csname\??py:c:\number\previouspropertylevel\endcsname} % string
% more efficient:
\def\currentproperty {\csname\??py:c:\number\propertylevel\endcsname} % string
\def\currentpropertytype {\csname\??py\currentproperty\c!type\endcsname}
\def\docheckproperty % watch the s instead of e
{\csname\s!check\currentpropertytype property\endcsname
\global\expandafter\let\csname\??py\s!check\currentproperty\endcsname\empty}
\def\checkproperty[#1]%
{\bgroup
\def\currentproperty{#1}%
\csname\??py\s!check\currentproperty\endcsname
\egroup}
\unexpanded\def\property[#1]%
{\groupedcommand{\dostartproperty{#1}}\dostopproperty}
\unexpanded\def\startproperty[#1]%
{\dostartproperty{#1}}
\unexpanded\def\stopproperty
{\dostopproperty}
\def\dostartgproperty
{\begingroup\dostartproperty}
\def\dostopgproperty
{\dostopproperty\endgroup}
\def\dostartproperty#1% evt pack: {current}{level}{
{\global\advance\propertylevel\plusone
\@EAEAEA\xdef\currentproperty{#1}%
\global\advance\previouspropertylevel\plusone
\global\advance\currentpropertylevel\plusone
\csname\??py\s!check\currentproperty\endcsname
\csname\s!start\currentpropertytype\s!property\endcsname}
\def\dostopproperty
{\csname\s!stop\currentpropertytype\s!property\endcsname
\global\advance\currentpropertylevel\minusone
\global\advance\previouspropertylevel\minusone
\global\advance\propertylevel\minusone}
\def\defineproperty
{\dotripleempty\dodefineproperty}
\def\defineproperty
{\dotripleempty\dodefineproperty}
\def\dodefineproperty[#1]%
{\ifundefined{\??py#1\c!global}%
\expandafter\dododefineproperty
\else
\expandafter\nododefineproperty
\fi[#1]}
% due to initializations/counters, definitions are always global
%
% global : yes : ungrouped
% no : grouped
% method : command : define commands
% none : no commands
\def\dododefineproperty[#1][#2][#3]% global ! ! !
{\getgparameters[\??py#1][\c!global=\v!no,\c!type=#2,\c!method=\v!none,#3]% global ! ! ! !
\expandafter\newcount\csname\??py:l:#2\endcsname % current level
\expandafter\newcount\csname\??py:p:#2\endcsname % previous level
\global\csname\??py:p:#2\endcsname\minusone
\global\expandafter\expandafter\let\csname\??py:c:0\endcsname\empty
\letgvalue{\??py\s!check#1}\docheckproperty
\doifelsevalue{\??py#1\c!method}\v!command
{\doifelsevalue{\??py#1\c!global}\v!yes
{\setgvalue{\e!start#1}{\dostartproperty{#1}}%
\letgvalue{\e!stop #1}\dostopproperty}%
{\setgvalue{\e!start#1}{\dostartgproperty{#1}}%
\letgvalue{\e!stop #1}\dostopgproperty}}%
{\doifelsevalue{\??py#1\c!global}\v!yes
{\setgvalue{\e!start#2}[##1]{\dostartproperty{##1}}%
\letgvalue{\e!stop #2}\dostopproperty}%
{\setgvalue{\e!start#2}[##1]{\dostartgproperty{##1}}%
\letgvalue{\e!stop #2}\dostopgproperty}}}
\def\nododefineproperty[#1][#2][#3]%
{}
\def\doifelseproperty#1{\doifdefinedelse{\??py#1\c!global}}
\def\setupproperty
{\dodoubleempty\dosetupproperty}
\def\dosetupproperty[#1][#2]% local
{\ifsecondargument
\getparameters[\??py#1][#2]%
\else
\getparameters[\??py][#1]%
\fi}
\letvalue{\??py\s!empty}\empty
% beware, normally \*parameter concerns the current one
\def\propertyparameter#1#2% expands to #1 when not defined (see \define...)
{\csname\??py
\ifcsname\??py#1#2\endcsname
#1#2%
\else\ifcsname\??py\csname\??py#1\c!type\endcsname#2\endcsname
\csname\??py#1\c!type\endcsname#2%
\else
\s!empty
\fi\fi
\endcsname}
\def\currentpropertyparameter % self and class
{\propertyparameter\currentproperty}
\def\checkedpropertyparameter#1% only self
{\executeifdefined{\??py\currentproperty#1}}
\def\definepropertyhandler#1{\setvalue{\??py*#1}}
\def\propertyhandler #1{\getvalue{\??py*#1}}
\protect \endinput
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