[NTG-context] mp inclusions etc

18 Feb 2013

      Hi,

I updated the inclusion mechanism a bit. It's now:

% initializations:
%
% - pass settings from tex to mp (delayed expansion)
% - used by context core (and modules)
% - cummulative definitions
% - flushed each graphic
% - can be disabled per instance
% - managed at the tex end
%
% extensions:
%
% - add mp functionality (immediate expansion)
% - cummulative
% - all instances or subset of instances
% - can be disabled per instance
% - managed at the lua/mp end
% - could be managed at the tex end but no real reason and also messy
%
% definitions:
%
% - add mp functionality (delayed expansion)
% - cummulative
% - per instance
% - managed at the tex end
%
% inclusions:
%
% - add mp functionality (delayed expansion)
% - cummulative only when [+]
% - per instance
% - managed at the tex end
%
% order of execution:
%
%   definitions
%   extensions
%   inclusions
%   beginfig
%     initializations
%     graphic
%   endfig

So, the main differences are:

(1) inclusions bound to default or specific instanced
(2) extensions more flexible

\starttext

\startMPextensions
     color ColorOne   ; ColorOne   := red ;
     color ColorTwo   ; ColorTwo   := green ;
     color ColorThree ; ColorThree := blue ;
\stopMPextensions

\startMPextensions{doublefun}
     color ColorThree ; ColorThree := magenta ;
\stopMPextensions

\startMPinclusions
     def DoWhatever = draw textext("N") ; enddef ;
\stopMPinclusions

\startMPinclusions
     def DoWhatever = draw textext("Y") ; enddef ;
\stopMPinclusions

\startMPinclusions{doublefun}
     def DoWhatever = draw textext("Y") ; enddef ;
\stopMPinclusions

\startMPinclusions[+]{doublefun}
     def DoWhatever = draw textext("YY") ; enddef ;
\stopMPinclusions

\startMPcode{metafun}
     draw fullcircle scaled 1cm withcolor ColorOne   withpen pencircle 
scaled 1mm ;
     draw fullcircle scaled 2cm withcolor ColorTwo   withpen pencircle 
scaled 1mm ;
     draw fullcircle scaled 3cm withcolor ColorThree withpen pencircle 
scaled 1mm ;
     DoWhatever ;
\stopMPcode

\startMPcode{doublefun}
     draw fullcircle scaled 1cm withcolor ColorOne   withpen pencircle 
scaled 1mm ;
     draw fullcircle scaled 2cm withcolor ColorTwo   withpen pencircle 
scaled 1mm ;
     draw fullcircle scaled 3cm withcolor ColorThree withpen pencircle 
scaled 1mm ;
     DoWhatever ;
\stopMPcode

\stoptext

Hans

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                                           Hans Hagen | PRAGMA ADE
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