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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 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.
\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.
\ifdefined\setnaturalcatcodes \else \let\setnaturalcatcodes\relax \fi
\ifdefined\obeylualines \else \let\obeylualines \relax \fi
\ifdefined\obeyluatokens \else \let\obeyluatokens \relax \fi
%D A few more goodies:
\let\stoplua \relax % tex catcodes
\let\stopluacode\relax % lua catcodes
% It might makes sense to have a \type {\directelua} so that we can avoid
% the \type {\normalexpanded} around \type {\directlua}. Something to discuss
% in the team.
\unexpanded\def\startlua % \stoplua
{\begingroup
\obeylualines
\luat_start_lua_indeed}
\def\luat_start_lua_indeed#1\stoplua
{\normalexpanded{\endgroup\noexpand\directlua{#1}}} % \zerocount is default
\unexpanded\def\startluacode % \stopluacode
{\begingroup
\obeylualines
\obeyluatokens
\luat_start_lua_code_indeed}
\def\luat_start_lua_code_indeed#1\stopluacode
{\normalexpanded{\endgroup\noexpand\directlua{#1}}} % \zerocount is default
%D Some delayed definitions:
\ifdefined\obeylines \else \let\obeylines \relax \fi
\ifdefined\obeyedline \else \let\obeyedline \relax \fi
\ifdefined\obeyspaces \else \let\obeyspaces \relax \fi
\ifdefined\obeyedspace \else \let\obeyedspace \relax \fi
\let\obeylualines\relax
\newtoks\everyluacode
\edef\lua_letter_backslash{\string\\}
\edef\lua_letter_bar {\string\|} \edef\lua_letter_dash {\string\-}
\edef\lua_letter_lparent {\string\(} \edef\lua_letter_rparent {\string\)}
\edef\lua_letter_lbrace {\string\{} \edef\lua_letter_rbrace {\string\}}
\edef\lua_letter_squote {\string\'} \edef\lua_letter_dquote {\string\"}
\edef\lua_letter_n {\string\n} \edef\lua_letter_r {\string\r}
\edef\lua_letter_f {\string\f} \edef\lua_letter_t {\string\t}
\edef\lua_letter_a {\string\a} \edef\lua_letter_b {\string\b}
\edef\lua_letter_v {\string\v} \edef\lua_letter_s {\string\s}
\edef\lua_letter_one {\string\1} \edef\lua_letter_two {\string\2}
\edef\lua_letter_three {\string\3} \edef\lua_letter_four {\string\4}
\edef\lua_letter_five {\string\5} \edef\lua_letter_six {\string\6}
\edef\lua_letter_seven {\string\7} \edef\lua_letter_eight {\string\8}
\edef\lua_letter_nine {\string\9} \edef\lua_letter_zero {\string\0}
\appendtoks
\let\\\lua_letter_backslash
\let\|\lua_letter_bar \let\-\lua_letter_dash
\let\(\lua_letter_lparent \let\)\lua_letter_rparent
\let\{\lua_letter_lbrace \let\}\lua_letter_rbrace
\let\'\lua_letter_squote \let\"\lua_letter_dquote
\let\n\lua_letter_n \let\r\lua_letter_r
\let\f\lua_letter_f \let\t\lua_letter_t
\let\a\lua_letter_a \let\b\lua_letter_b
\let\v\lua_letter_v \let\s\lua_letter_s
\let\1\lua_letter_one \let\2\lua_letter_two
\let\3\lua_letter_three \let\4\lua_letter_four
\let\5\lua_letter_five \let\6\lua_letter_six
\let\7\lua_letter_seven \let\8\lua_letter_eight
\let\9\lua_letter_nine \let\0\lua_letter_zero
\to \everyluacode
\unexpanded\def\obeyluatokens
{\setcatcodetable\luacatcodes
\the\everyluacode}
\edef\luamajorversion{\ctxwrite{_MINORVERSION}}
\edef\luaminorversion{\ctxwrite{_MAJORVERSION}}
%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.
\installcorenamespace{luacode}
\unexpanded\def\luat_start_named_lua_code#1%
{\begingroup
\obeylualines
\obeyluatokens
\csname\??luacode#1\endcsname}
\unexpanded\def\definenamedlua[#1]#2[#3]% no optional arg handling here yet / we could use numbers instead (more efficient)
{\ifcsname\??luacode#1\endcsname \else
\scratchcounter\ctxlua{lua.registername("#1","#3")}%
\normalexpanded{\xdef\csname\??luacode#1\endcsname##1\csname\e!stop#1\v!code\endcsname}%
%{\endgroup\noexpand\directlua\the\scratchcounter{local _ENV=protect("#1\s!data")##1}}%
{\noexpand\normalexpanded{\endgroup\noexpand\directlua\the\scratchcounter{local _ENV=protect("#1\s!data")##1}}}%
\expandafter\edef\csname\e!start#1\v!code\endcsname {\luat_start_named_lua_code{#1}}%
\expandafter\edef\csname #1\v!code\endcsname##1{\noexpand\directlua\the\scratchcounter{local _ENV=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 context("LUA")
%D \stopluacode
%D
%D \startusercode
%D global.context("USER 1")
%D context.par()
%D context("USER 2")
%D context.par()
%D if characters then
%D context("ACCESS directly")
%D elseif global.characters then
%D context("ACCESS via global")
%D else
%D context("NO ACCESS at all")
%D end
%D context.par()
%D if bogus then
%D context("ACCESS directly")
%D elseif global.bogus then
%D context("ACCESS via global")
%D else
%D context("NO ACCESS at all")
%D end
%D context.par()
%D \stopusercode
%D \stopbuffer
%D
%D \typebuffer
%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
\luat_start_lua_parameter_set{#1}}
\def\luat_start_lua_parameter_set#1#2\stopluaparameterset
{\ctxlua{parametersets["#1"]={#2}}%
\endgroup}
\let\stopluaparameterset\relax
\def\luaparameterset#1#2{\ctxlua{parametersets["#1"]={#2} context("#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
\unexpanded\def\ctxluacode
{\begingroup
\obeylualines
\obeyluatokens
\catcode\leftbraceasciicode \plusone
\catcode\rightbraceasciicode\plustwo
\afterassignment\luat_lua_code
\scratchtoks=}
% Hm, are we sure that the \* commands work out okay here? We could probably
% use \setcatcodetable\luacatcodes instead of \obeyluatokens now.
\def\luat_lua_code
{\normalexpanded{\endgroup\noexpand\directlua\expandafter{\the\scratchtoks}}} % \zerocount is default
\protect \endinput
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