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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:
string mfun_lua_bs ; mfun_lua_bs := "[===[" ;
string mfun_lua_es ; mfun_lua_es := "]===]" ;
vardef mlib_luas_luacall(text t) =
runscript("" for s = t :
if string s :
& s
% & mfun_lua_bs & s & mfun_lua_es
elseif numeric s :
& decimal s
elseif boolean s :
& if s : "true" else : "false" fi
elseif pair s :
& mfun_pair_to_table(s)
elseif path s :
& mfun_path_to_table(s)
elseif rgbcolor s :
& mfun_rgb_to_table(s)
elseif cmykcolor s :
& mfun_cmyk_to_table(s)
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
% & mfun_lua_bs & s & mfun_lua_es
% elseif numeric s :
% & decimal s
% elseif boolean s :
% & if s : "true" else : "false" fi
% elseif pair s :
% & mfun_pair_to_table(s)
% elseif path s :
% & mfun_path_to_table(s)
% elseif rgbcolor s :
% & mfun_rgb_to_table(s)
% elseif cmykcolor s :
% & mfun_cmyk_to_table(s)
% else :
% & ditto & tostring(s) & ditto
% fi endfor & ")"
% )
% enddef ;
newinternal mfun_luas_b ;
def mlib_luas_luadone =
exitif numeric begingroup mfun_luas_b := 1 ; endgroup ;
enddef ;
vardef mlib_luas_lualist(expr c)(text t) =
interim mfun_luas_b := 0 ;
runscript(c & for s = t :
if mfun_luas_b = 0 :
"("
% hide(mfun_luas_b := 1)
mlib_luas_luadone
else :
","
fi
&
if string s :
mfun_lua_bs & s & mfun_lua_es
elseif numeric s :
decimal s
elseif boolean s :
if s : "true" else : "false" fi
elseif pair s :
mfun_pair_to_table(s)
elseif path s :
mfun_path_to_table(s)
elseif rgbcolor s :
mfun_rgb_to_table(s)
elseif cmykcolor s :
mfun_cmyk_to_table(s)
else :
ditto & tostring(s) & ditto
fi & endfor if mfun_luas_b = 0 : "()" else : ")" fi
)
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 =
lua.mp.report(tostring(t)) ;
enddef ;
% Modes:
vardef texmode (expr s) = lua.mp("mode", s) enddef ;
vardef systemmode(expr s) = lua.mp("systemmode",s) enddef ;
% A few helpers
vardef isarray suffix a = lua.mp.isarray (str a) enddef ;
vardef prefix suffix a = lua.mp.prefix (str a) enddef ;
vardef dimension suffix a = lua.mp.dimension(str a) enddef ;
% More access
vardef getmacro(expr k) = lua.mp._get_macro_(k) enddef ;
vardef getdimen(expr k) = lua.mp._get_dimen_(k) enddef ;
vardef getcount(expr k) = lua.mp._get_count_(k) enddef ;
vardef gettoks (expr k) = lua.mp._get_toks_ (k) enddef ;
def setmacro(expr k,v) = lua.mp._set_macro_(k,v) 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 positionpath (expr name) = lua.mp.positionpath (name) enddef ;
vardef positioncurve (expr name) = lua.mp.positioncurve (name) enddef ;
vardef positionxy (expr name) = lua.mp.positionxy (name) enddef ;
vardef positionpxy (expr name) = lua.mp.positionpxy (name) enddef ;
vardef positionwhd (expr name) = lua.mp.positionwhd (name) enddef ;
vardef positionpage (expr name) = lua.mp.positionpage (name) enddef ;
vardef positionregion(expr name) = lua.mp.positionregion(name) enddef ;
vardef positionbox (expr name) = lua.mp.positionbox (name) enddef ;
vardef positionanchor = lua.mp.positionanchor() enddef ;
let wdpart = redpart ;
let htpart = greenpart ;
let dppart = bluepart ;
vardef positioninregion =
currentpicture := currentpicture shifted - positionxy(positionanchor) ;
enddef ;
vardef positionatanchor(expr name) =
currentpicture := currentpicture shifted - positionxy(name) ;
enddef ;
vardef texvar(expr name) = lua.mp.texvar(name) enddef ;
vardef texstr(expr name) = lua.mp.texstr(name) enddef ;
%D New experimental feature for Alan-The-Number-Cruncher:
% \startMPcode{doublefun}
% path p ; p := (
% for i=1 upto 20000 :
% origin randomized 10000 ..
% endfor cycle
% ) xysized (TextWidth,TextHeight) ;
% draw for i inpath p:
% pointof i .. controls (leftof i) and (rightof i) ..
% endfor cycle ;
% \stopMPcode
% def inpath suffix p =
% = 1 step 1 until lua.mp.mf_path_length(str p)
% enddef ;
% def inpath suffix p =
% % = 1 step 1 until lua.mp.mf_path_length(str p)
% = 1 step 1 until (begingroup save n ; n := lua.mp.mf_path_length(str p) ; if n = 0 : 1 else : n fi endgroup)
% enddef ;
def inpath suffix p = % permits p[0]
= 1 step 1 until
begingroup
save mfun_inpath_r,mfun_inpath_n ; path mfun_inpath_r ;
mfun_inpath_r = p ;
mfun_inpath_n := lua.mp.mf_path_length(str mfun_inpath_r) ;
if mfun_inpath_n = 0 : 1 else : mfun_inpath_n fi
endgroup
enddef ;
vardef pointof primary i = lua.mp.mf_path_point(i) enddef ;
vardef leftof primary i = lua.mp.mf_path_left (i) enddef ;
vardef rightof primary i = lua.mp.mf_path_right(i) enddef ;
extra_endfig := extra_endfig & " lua.mp.mf_path_reset() ; " ;
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