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%D \module
%D [ file=syst-lua,
%D version=2008.01.25,
%D title=\CONTEXT\ System Macros,
%D subtitle=Helper macros based on \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.
\registerctxluafile{syst-lua}{}
\unprotect
\def\expdoifelse#1#2{\clf_doifelsesame{#1}{#2}}
\def\expdoif #1#2{\clf_doifsame {#1}{#2}}
\def\expdoifnot #1#2{\clf_doifnotsame {#1}{#2}}
%D Here is variant using a brainwave of the 12\high{+} hour \quotation {Long Road
%D Out of Eden}\footnote {Eden being Backo\TeX\ 2018, where the virtues of the \type
%D {\expanded} primitive were mentioned in talks.} trip. For now I don't really see
%D other useful applications.
\ifdefined\immediateassignment
\def\expandeddoif#1#2%
{\immediateassignment\edef\m_syst_string_one{#1}%
\immediateassignment\edef\m_syst_string_two{#2}%
\ifx\m_syst_string_one\m_syst_string_two
\expandafter\firstofoneargument
\else
\expandafter\gobbleoneargument
\fi}
\def\expandeddoifnot#1#2%
{\immediateassignment\edef\m_syst_string_one{#1}%
\immediateassignment\edef\m_syst_string_two{#2}%
\ifx\m_syst_string_one\m_syst_string_two
\expandafter\gobbleoneargument
\else
\expandafter\firstofoneargument
\fi}
\def\expandeddoifelse#1#2%
{\immediateassignment\edef\m_syst_string_one{#1}%
\immediateassignment\edef\m_syst_string_two{#2}%
\ifx\m_syst_string_one\m_syst_string_two
\expandafter\firstoftwoarguments
\else
\expandafter\secondoftwoarguments
\fi}
\fi
% \testfeatureonce{100000}{\doifelse{hello world}{here i am}{}} % 0.3
% \testfeatureonce{100000}{\expandabledoifelse{hello world}{here i am}{}} % 1.5
\def\expdoifelsecommon#1#2{\clf_doifelsecommon{#1}{#2}}
\def\expdoifelseinset #1#2{\clf_doifelseinset {#1}{#2}}
\def\expdoifcommonelse\expdoifelsecommon
\def\expdoifinsetelse \expdoifelseinset
% we define these here, just in case ...
\def\luastringsep{===} % this permits \typefile{self} otherwise nested b/e sep problems
\edef\!!bs{[\luastringsep[}
\edef\!!es{]\luastringsep]}
\unexpanded\def\writestatus#1#2{\clf_writestatus{#1}{#2}}
% A handy helper:
% \def\luaexpr#1{\ctxlua{context(tostring(#1))}} % more efficient:
% We can omit the tex.ctxcatcodes here as nowadays we seldom
% change the regime at the \TEX\ end:
\def\luaexpr#1{\ctxlua{tex.print(tostring(#1))}} % no use is shortcutting has to be compiled
% helpers:
\def\ui_fo #1{#1}
\def\ui_go #1{}
\def\ui_ft#1#2{#1}
\def\ui_st#1#2{#2}
%D But as we only use write 16 we could as well do all in \LUA\
%D and ignore the rest. Okay, we still can do writes here but only
%D when not blocked.
\let\syst_write_execute\clf_execute % always {...}
\protect \endinput
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