[NTG-context] TeX capacity exceeded - in Lua block - why?

Hans Hagen pragma at wxs.nl
Thu Jul 16 10:27:48 CEST 2015


On 7/16/2015 10:20 AM, Procházka Lukáš Ing. - Pontex s. r. o. wrote:
> Hello,
>
> why this code:
>
> ----
> \def\GG{\ifmmode G_G\else$\GG$\fi}

because in math mode \GG expands \GG which expands \GG ....

maybe you mean:

\def\GG{\ifmmode G_G\else$GG$\fi}

> \starttext
>    \GG $\GG$ % OK
>    \startitemize[][]
>      \sym{\GG} \GG % OK
>    \stopitemize
>
>    \startluacode
>      context.startitemize()
>        context.sym([[\GG]])
>        context("Abc")
>      context.stopitemize()
>    \stopluacode
> \stoptext
> ----
>
> fails with:
>
> "
> ....
> tex error       > tex error on line 14 in file
> d://Lukas/Docs/Ull-Gra/Test/Abr.mkiv: ! TeX capacity exceeded, sorry
> [input stack size=10000]
>
>
> \GG ->\ifmmode G_G\else $\GG
>                               $\fi
> \GG ->\ifmmode G_G\else $\GG
>                               $\fi
> \GG ->\ifmmode G_G\else $\GG
>                               $\fi
> \GG ->\ifmmode G_G\else $\GG
>                               $\fi
> \GG ->\ifmmode G_G\else $\GG
>                               $\fi
> \GG ->\ifmmode G_G\else $\GG
>                               $\fi
> ....
> l.14   \stopluacode
> ....
> "
>
> I need to call "\GG" from within Lua, and the real macro name is created
> run-time (contrary to this MNWE; so to be \GG, \HH, \Fik etc. - the name
> is obtained from a Lua table as a string).
>
> I cannot understand why all TeX calls are OK but the problem appears in
> Lua block...
>
> Best regards,
>
> Lukas
>
>
>
>
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