Martin Althoff schrieb am 27.09.2019 um 06:59:
Hi, I am trying to pass variables/data between context and lua. Lua would be
used for
calculations on data coming from context.
Unfortunately I can't figure out what to do. The code below doesn't work, but
is there to
illustrate my idea.
Any help would be much appreciated. Thanks, Martin
\define\question{44}
\defineexpandable\question{44}
\starttext
\startluacode
local points = \question * 92
-- do some calculations with points and return to to context
answer=42
\stopluacode
% lots of Text in between
The answer is \answer
\stoptext
A solution which uses only existing commands in the document.
\startsetups [martin]
\startlua
local points = tonumber(\getvariable{martin}{question}) or 0 ;
points = points * 92 ;
local answer = 42 ;
context.setvariable("martin","points",points) ;
context.setvariable("martin","answer",answer) ;
\stoplua
\stopsetups
\setvariable{martin}{set}{\directsetup{martin}}
\starttext
\setvariables [martin] [question=44]
Points: \getvariable{martin}{points}
The answer is \getvariable{martin}{answer}.
\stoptext
Wolfgang
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