TeX expansion within lua

[Marco Patzer <homerow@lavabit.com>]

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?


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.


Marco

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