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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
else :
& ditto & tostring(s) & ditto
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
else :
& ditto & tostring(s) & ditto
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 ;
def message expr t =
if t <> "" : lua.mp.report(t) fi ;
enddef ;
% a few helpers
% A few helpers:
vardef isarray suffix a =
lua.mp.isarray(str a)
enddef ;
vardef prefix suffix a =
lua.mp.prefix(str a)
enddef ;
vardef dimensions suffix a =
lua.mp.dimensions(str a)
enddef ;
% More access
def getdimen(expr k) = lua.mp._get_dimen_(k) enddef ;
def getcount(expr k) = lua.mp._get_count_(k) enddef ;
def gettoks (expr k) = lua.mp._get_toks_ (k) enddef ;
def setdimen(expr k, v) = lua.mp._set_dimen_(k,v) enddef ;
def setcount(expr k, v) = lua.mp._set_count_(k,v) enddef ;
def settoks (expr k, v) = lua.mp._set_toks_ (k,v) enddef ;
% vardef getdimen(expr k) = save getdimen ; lua.mp.getdimen(k) enddef ;
% vardef getcount(expr k) = save getcount ; lua.mp.getcount(k) enddef ;
% vardef gettoks (expr k) = save gettoks ; lua.mp.gettoks (k) enddef ;
% vardef setdimen(expr k,v) = save setdimen ; lua.mp.setdimen(k,v) enddef ;
% vardef setcount(expr k,v) = save setcount ; lua.mp.setcount(k,v) enddef ;
% vardef settoks (expr k,v) = save settoks ; lua.mp.settoks (k,v) enddef ;
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