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%D \module
%D [ file=luat-ini,
%D version=2005.08.11,
%D title=\CONTEXT\ Lua Macros,
%D subtitle=Initialization,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright=PRAGMA]
%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 Lua Macros / Initialization}
\unprotect
%D Loading lua code can be done using \type {startup.lua}. The following
%D method uses the \TEX\ input file locator of kpse. At least we need to
%D use that way of loading when we haven't yet define our own code, which
%D we keep outside the format. We will keep code outside \TEX\ files as
%D much as possible.
\ifx\setnaturalcatcodes\undefined \let\setnaturalcatcodes\relax \fi
\ifx\obeylualines \undefined \let\obeylualines \relax \fi
\ifx\obeyluatokens \undefined \let\obeyluatokens \relax \fi
%D A few more goodies:
\long\def\dostartlua
{\begingroup
\obeylualines
\dodostartlua}
\long\def\dodostartlua#1\stoplua
{\normalexpanded{\endgroup\noexpand\directlua\zerocount{#1}}}
\long\def\dostartluacode
{\begingroup
\obeylualines
\obeyluatokens
\dodostartluacode}
\long\def\dodostartluacode#1\stopluacode
{\normalexpanded{\endgroup\noexpand\directlua\zerocount{#1}}}
\unexpanded\def\startlua {\dostartlua } % tex catcodes
\unexpanded\def\startluacode{\dostartluacode} % lua catcodes
%D Some delayed definitions:
\ifx\obeylines \undefined \let\obeylines \relax \fi
\ifx\obeyedline \undefined \let\obeyedline \relax \fi
\ifx\obeyspaces \undefined \let\obeyspaces \relax \fi
\ifx\obeyedspace \undefined \let\obeyedspace \relax \fi
\let\obeylualines\relax
\newtoks\everyluacode
\edef\lualetterbackslash{\string\\}
\edef\lualetterbar {\string\|} \edef\lualetterdash {\string\-}
\edef\lualetterlparent {\string\(} \edef\lualetterrparent {\string\)}
\edef\lualetterlbrace {\string\{} \edef\lualetterrbrace {\string\}}
\edef\lualettersquote {\string\'} \edef\lualetterdquote {\string\"}
\edef\lualettern {\string\n} \edef\lualetterr {\string\r}
\edef\lualetterf {\string\f} \edef\lualettert {\string\t}
\edef\lualettera {\string\a} \edef\lualetterb {\string\b}
\edef\lualetterv {\string\v} \edef\lualetters {\string\s}
\edef\lualetterone {\string\1} \edef\lualettertwo {\string\2}
\edef\lualetterthree {\string\3} \edef\lualetterfour {\string\4}
\edef\lualetterfive {\string\5} \edef\lualettersix {\string\6}
\edef\lualetterseven {\string\7} \edef\lualettereight {\string\8}
\edef\lualetternine {\string\9} \edef\lualetterzero {\string\0}
\appendtoks
\let\\\lualetterbackslash
\let\|\lualetterbar \let\-\lualetterdash
\let\(\lualetterlparent \let\)\lualetterrparent
\let\{\lualetterlbrace \let\}\lualetterrbrace
\let\'\lualettersquote \let\"\lualetterdquote
\let\n\lualettern \let\r\lualetterr
\let\f\lualetterf \let\t\lualettert
\let\a\lualettera \let\b\lualetterb
\let\v\lualetterv \let\s\lualetters
\let\1\lualetterone \let\2\lualettertwo
\let\3\lualetterthree \let\4\lualetterfour
\let\5\lualetterfive \let\6\lualettersix
\let\7\lualetterseven \let\8\lualettereight
\let\9\lualetternine \let\0\lualetterzero
\to \everyluacode
\def\obeyluatokens
{\setcatcodetable \luacatcodes
\the\everyluacode}
%D \macros
%D {definenamedlua}
%D
%D We provide an interface for defining instances:
\def\s!lua{lua} \def\v!code{code} \def\!!name{name} \def\s!data{data}
%D Beware: because \type {\expanded} is een convert command, the error
%D message will show \type{<inserted text>} as part of the message.
\long\def\dostartnamedluacode#1%
{\begingroup
\obeylualines
\obeyluatokens
\csname dodostartnamed#1\v!code\endcsname}
\unexpanded\def\definenamedlua[#1]#2[#3]% no optional arg handling here yet
{\ifcsname dodostartnamed#1\v!code\endcsname\else
\scratchcounter\ctxlua{lua.registername("#1","#3")}%
\normalexpanded{\long\edef\csname dodostartnamed#1\v!code\endcsname##1\csname\e!stop#1\v!code\endcsname}%
{\endgroup\noexpand\directlua\the\scratchcounter{protect("#1\s!data")##1}}%
\long\expandafter\def \csname\e!start#1\v!code\endcsname {\dostartnamedluacode{#1}}%
\long\expandafter\edef\csname #1\v!code\endcsname##1{\noexpand\directlua\the\scratchcounter{protect("#1\s!data")##1}}%
\fi}
%D We predefine a few.
% \definenamedlua[module][module instance] % not needed
\definenamedlua[user] [private user instance]
\definenamedlua[third] [third party module instance]
\definenamedlua[isolated][isolated instance]
%D In practice this works out as follows:
%D
%D \startbuffer
%D \startluacode
%D tex.print("LUA")
%D \stopluacode
%D
%D \startusercode
%D global.tex.print("USER 1")
%D tex.print("USER 2")
%D if characters then
%D tex.print("ACCESS")
%D else
%D tex.print("NO ACCESS")
%D end
%D \stopusercode
%D \stopbuffer
%D
%D \typebuffer \getbuffer
%D We need a way to pass strings safely to \LUA\ without the
%D need for tricky escaping. Compare:
%D
%D \starttyping
%D \ctxlua {something("anything tricky can go here")}
%D \ctxlua {something([\luastringsep[anything tricky can go here]\luastringsep])}
%D \stoptyping
\def\luastringsep{===} % this permits \typefile{self} otherwise nested b/e sep problems
\edef\!!bs{[\luastringsep[}
\edef\!!es{]\luastringsep]}
%D We have a the following available as primitive so there is no need
%D for it:
%D
%D \starttyping
%D \long\edef\luaescapestring#1{\!!bs#1\!!es}
%D \stoptyping
\def\setdocumentfilename #1#2{\ctxlua{document.setfilename(#1,"#2")}}
\def\setdocumentargument #1#2{\ctxlua{document.setargument("#1","#2")}}
\def\setdocumentargumentdefault#1#2{\ctxlua{document.setdefaultargument("#1","#2")}}
\def\getdocumentfilename #1{\ctxlua{document.getfilename("#1")}}
\def\getdocumentargument #1{\ctxlua{document.getargument("#1")}}
\def\getdocumentargumentdefault#1#2{\ctxlua{document.getargument("#1","#2")}}
\def\doifdocumentargumentelse #1{\doifsomethingelse{\getdocumentargument{#1}}}
\def\doifdocumentargument #1{\doifsomething {\getdocumentargument{#1}}}
\def\doifnotdocumentargument #1{\doifnothing {\getdocumentargument{#1}}}
\def\doifdocumentfilenameelse #1{\doifsomethingelse{\getdocumentfilename{#1}}}
\def\doifdocumentfilename #1{\doifsomething {\getdocumentfilename{#1}}}
\def\doifnotdocumentfilename #1{\doifnothing {\getdocumentfilename{#1}}}
\let\doifelsedocumentargument\doifdocumentargumentelse
%D A handy helper:
\def\luaexpanded#1{\luaescapestring\expandafter{\normalexpanded{#1}}}
%D Experimental:
\unexpanded\def\startluaparameterset[#1]%
{\begingroup
\obeylualines
\obeyluatokens
\dostartluaparameterset{#1}}
\long\def\dostartluaparameterset#1#2\stopluaparameterset
{\ctxlua{parametersets["#1"]={#2}}%
\endgroup}
\def\luaparameterset#1#2{\ctxlua{parametersets["#1"]={#2} tex.sprint("#1")}}
% todo: \mergeparameterset
% usage:
%
% \startluaparameterset [u3d:myset:display:1]
% toolbar=false,
% tree=true
% \stopluaparameterset
%
% option=u3d:myset:display:1
%
% or:
%
% option=\luaparameterset{u3d:myset:display:1}{toolbar=false,tree=true}
%D A Handy helper:
\def\luaconditional#1{\ifcase#1tru\else fals\fi e}
%D Goodie:
%D
%D \starttyping
%D \ctxluacode{context("%0.5f",1/3)}
%D \stoptyping
\long\def\ctxluacode
{\begingroup
\obeylualines
\obeyluatokens
\catcode\leftbraceasciicode \plusone
\catcode\rightbraceasciicode\plustwo
\afterassignment\doctxluacode
\scratchtoks=}
\def\doctxluacode
{\normalexpanded{\endgroup\noexpand\directlua\zerocount\expandafter{\the\scratchtoks}}}
\protect \endinput
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