From: Aditya Mahajan <adityam@umich.edu>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: TeX expansion within lua
Date: Tue, 4 Sep 2012 11:28:56 -0400 (EDT) [thread overview]
Message-ID: <alpine.LNX.2.02.1209041127010.21943@ybpnyubfg.ybpnyqbznva> (raw)
In-Reply-To: <20120904171243.3f70b4a6@homerow>
On Tue, 4 Sep 2012, Marco Patzer wrote:
> Hi,
>
> please have a look at the following example:
>
> \starttext
>
> \def\cmd{%
> \def\mymacro{Foobar}
> \newtoks\mytoks
> \mytoks={mytoks}}
>
> \startluacode
> context.cmd()
> context.mymacro()
> -- this fails
> -- context(tex.toks.mytoks)
> \stopluacode
>
> -- this works
> \startluacode
> context(tex.toks.mytoks)
> \stopluacode
>
> \stoptext
>
> Why does the first call to tex.toks.mytoks fail?
>
> Apparently the luacode environment has to be closed for cmd to be
> expanded. I guess that the call to mymacro() succeeds is a quirk due
> to the face that the macro is expanded later, in contrast to tokens,
> dimens and counters.
>
> Is there a command I can use within Lua to expand a macro
> immediately or to expand the pending macros to be able to access the
> values like the token register in the example?
Instead of
context(tex.toks.mytoks)
use
context(function () context(tex.toks.mytoks) end)
See the ConTeXt Lua Document manual for explanation.
>
> Another question which is related:
>
> Is there a way to access the contents of the macro from within Lua
> like counters and token registers?
>
> \starttext
>
> \newtoks\mytoks
> \mytoks={Foobar}
>
> \startluacode
> local tok = tex.toks.mytoks
>
> -- something like this is what I have in mind
> -- local mac = tex.macros.somemacro
> \stopluacode
>
> \stoptext
>
> I am just interested in a text string, not a box with typeset
> material. I guess that's more difficult, since macros are expanded
> and not just simply read.
AFAIK, this is not possible.
Aditya
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next prev parent reply other threads:[~2012-09-04 15:28 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-04 15:12 Marco Patzer
2012-09-04 15:28 ` Aditya Mahajan [this message]
2012-09-04 16:54 ` Marco Patzer
2012-09-04 17:06 ` Martin Schröder
2012-09-04 17:40 ` Marco Patzer
2012-09-04 17:53 ` Wolfgang Schuster
2012-09-04 18:11 ` Marco Patzer
2012-09-04 18:25 ` Wolfgang Schuster
2012-09-04 18:58 ` Marco Patzer
2012-09-05 9:18 ` Hans Hagen
2012-09-05 9:42 ` Marco Patzer
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