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%D \module
%D [ file=mp-luas.mpiv,
%D version=2014.04.14,
%D title=\CONTEXT\ \METAPOST\ graphics,
%D subtitle=\LUA,
%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.
if known context_luas : endinput ; fi ;
% When I prototyped the runscript primitive I was just thinking of a usage like
% the original \directlua primitive in luatex: genererate something and pipe
% that back to metapost, and have access to some internals. Instead of compiling
% the code a the metapost end here we delegate that to the lua end. Only strings
% get passed. Of course in the end the real usage got a bit beyong the intended
% usage. So, in addition to some definitions here there are and will be use in
% other metafun modules too. Of course in retrospect I should have done this five
% years earlier.
boolean context_luas ; context_luas := true ;
% First variant:
%
% let lua = runscript ;
%
% Second variant:
%
% vardef lua (text t) =
% runscript(for s = t : s & endfor "")
% enddef;
%
% Third variant:
%
% vardef lua (text t) =
% runscript("" for s = t :
% if string s :
% & s
% elseif numeric s :
% & decimal s
% elseif boolean s :
% & if s : "true" else "false" fi
% fi endfor)
% enddef;
%
% Fourth variant:
vardef mlib_luas_luacall(text t) =
runscript("" for s = t :
if string s :
& s
elseif numeric s :
& decimal s
elseif boolean s :
& if s : "true" else : "false" fi
fi endfor
)
enddef ;
vardef mlib_luas_lualist(expr c)(text t) =
save b ; boolean b ; b := false ;
runscript(c & "(" for s = t :
if b :
& ","
else :
hide(b := true)
fi
if string s :
& ditto & s & ditto
elseif numeric s :
& decimal s
elseif boolean s :
& if s : "true" else : "false" fi
fi endfor & ")"
)
enddef ;
def luacall = mlib_luas_luacall enddef ; % why no let
vardef lualist@#(text t) = mlib_luas_lualist(str @#)(t) enddef ;
string mlib_luas_s ; % saves save/restore
vardef lua@#(text t) =
mlib_luas_s := str @# ;
if length(mlib_luas_s) > 0 :
mlib_luas_lualist(mlib_luas_s,t)
else :
mlib_luas_luacall(t)
fi
enddef ;
vardef MP@#(text t) =
mlib_luas_lualist("MP." & str @#,t)
enddef ;
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