Re: [NTG-pdftex] \expanded

11 Dec 2007

      On Tue, Dec 11, 2007 at 05:54:42PM +0100, Taco Hoekwater wrote:
...
Heiko Oberdiek wrote:
...
Patch 885.
I suspect there will be a problem with
\setvalue{begin\expanded{\getvalue{relax}}}
but have not time to delve into that right now.
I suspect this, because \directlua in luatex has similar
problems wrt. the 'current string', and I had to do
introduce a variable to save that, like this:
procedure conv_toks;
     u:str_number;
     {...}
u:=0;
     if str_start_macro(str_ptr)0 then begin
       if str_ptr=u+1 then
         decr(str_ptr)
       else begin {copy old string to the top location}
          i:=0;
          str_room(length(u));
          while i
In pdfTeX 1.40.5 all the primitives (\pdfstrcmp, \pdfescape*, ...)
are surrounded by save_cur_string and restore_cur_string. They
do quite similar:

@dsave_cur_string==if str_start[str_ptr]0 then begin decr(str_ptr); u:=0; end

The initial "u:=0" and the extra "else" case aren't present.
Either the situation in LuaTeX is a little different or
all these primitives would probably need this. But I don't
have any examples that would show the problem.

Yours sincerely
  Heiko 
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