From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.comp.tex.context/91954 Path: news.gmane.org!not-for-mail From: luigi scarso Newsgroups: gmane.comp.tex.context Subject: Re: TeX capacity exceeded - in Lua block - why? 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boundary=047d7bb04822e7b0cc051afa566c --047d7bb04822e7b0cc051afa566c Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Thu, Jul 16, 2015 at 10:55 AM, Proch=C3=A1zka Luk=C3=A1=C5=A1 Ing. - Pon= tex s. r. o. < LPr@pontex.cz> wrote: > Hello, > > On Thu, 16 Jul 2015 10:27:48 +0200, Hans Hagen wrote: > > On 7/16/2015 10:20 AM, Proch=C3=A1zka Luk=C3=A1=C5=A1 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 .... >> > > I want to just pass G_G in math mode, so it seems to me that "\ifmmode > G_G..." does the check. > > The macro should write G + "lower index G" for both math and non-math > scope. > > And, in non math scope, the macro should just enclose itself by $...$ (or > \m{...})... > > And, this works well in TeX code: > > ---- > \def\GG{\ifmmode G_G\else$\GG$\fi} > > \starttext > \GG $\GG$ > \startitemize[][] > \sym{\GG} \GG > \sym{$\GG$} $\GG$ > \sym{\m{\GG}} \m{\GG} > \item End > \stopitemize > \stoptext > ---- > > So how to rewrite the itemization into Lua? > > maybe you mean: >> >> \def\GG{\ifmmode G_G\else$GG$\fi} >> > > ... Could be \def\GG{\ifmmode G_G\else$G_G$\fi}, too, but why not > \def\GG{\ifmmode G_G\else$\GG$\fi} (seems to me be simpler as the macro > definition - which may be more complicated - appears only once)? > >> >>> \def\GG{\ifmmode G_G\else$\GG$\fi} means "define the macro \GG as G_G if mmmod is true, else as \GG " It's clear that you always are in a situation where mmod is true, then \GG is replaced with G_G but as soon as you fall into "mmod not true" then you have infinite recursion. --=20 luigi --047d7bb04822e7b0cc051afa566c Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable


On Thu, Jul 16, 2015 at 10:55 AM, Proch=C3=A1zka Luk=C3=A1=C5=A1 Ing. -= Pontex s. r. o. <LPr@pontex.cz> wrote:
Hell= o,

On Thu, 16 Jul 2015 10:27:48 +0200, Hans Hagen <pragma@wxs.nl> wrote:

On 7/16/2015 10:20 AM, Proch=C3=A1zka Luk=C3=A1=C5=A1 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 ....

 I want to just pass G_G in math mode, so it seems to me that "\ifmmode= G_G..." does the check.

The macro should write G + "lower index G" for both math and non-= math scope.

And, in non math scope, the macro should just enclose itself by $...$ (or \= m{...})...

And, this works well in TeX code:

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

 \starttext
=C2=A0 \GG $\GG$
=C2=A0 \startitemize[][]
=C2=A0 =C2=A0 \sym{\GG} \GG
=C2=A0 =C2=A0 \sym{$\GG$} $\GG$
=C2=A0 =C2=A0 \sym{\m{\GG}} \m{\GG}
=C2=A0 =C2=A0 \item End
=C2=A0 \stopitemize
\stoptext
----

So how to rewrite the itemization into Lua?

maybe you mean:

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

 ... Could be \def\GG{\ifmmode G_G\else$G_G$\fi}, too, but why not \def\GG{\= ifmmode G_G\else$\GG$\fi} (seems to me be simpler as the macro definition -= which may be more complicated - appears only once)?



=C2=A0\def\= GG{\ifmmode G_G\else$\GG$\fi}
means "define the macro \GG as= G_G if mmmod is true,
else as \GG "
It's clea= r that you =C2=A0always are in a situation where mmod is true, then \GG is = replaced with =C2=A0G_G
but as soon as you fall into "mmod n= ot true" then you have infinite recursion.

-= -
luigi
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