Am 25.01.2011 um 09:00 schrieb Procházka Lukáš Ing. - Pontex s. r. o.:
> Thank you, Wolfgang, this works better.
>
> Actually I need to use '%' in the condition and that fails:
>
> ---
> ...
> \startrawsetups layer
> % The value of 'n' is used here to set the appropriate background,
> % = n-th page of a PDF, and also to draw a filled rectangle on
> % the left or right side (depending on whether n is even or odd)
>
> % The code bellow fails
>
> \startluacode
> print("N=", n)
>
> if n % 2 == 1 then
>
> else
>
> end
> \stopluacode
> \stoprawsetups
> ...
> ---
>
> with:
>
> ---
> ! LuaTeX error <main ctx instance>:1: 'then' expected near 'else'.
> ---
>
> So like '%' was still treated as TeX comment char.
>
> How to enable '%'?
You can’t use % in the luacode environment when you write it inside
of another environment because TeX can change the meaning of % but
this should works (untested):
\startbuffer[lualayer]
% …
\startluacode
…
\stopluacode
\stopbuffer
\doifmode{foo}{\ctxluabuffer[lualayer]}
Wolfgang
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