[NTG-pdftex] [ pdftex-Patches-469 ] \currentexpansionmode + \ifalignscanning - \ifinedef

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Patches item #469, was opened at 2006-01-12 02:39
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Morten Høgholm (morten)
Assigned to: Nobody (None)
Summary: \currentexpansionmode + \ifalignscanning - \ifinedef

Initial Comment:
Here's a patch made against pdftex-1.40.0-alpha-20060111.  It 
removes the \ifinedef primitive for a different primitive, namely 
\currentexpansionmode. This read-only register is 0 when doing 
regular typesetting, 1 when inside \edef or \xdef and 2 in other 
cases of full expansion with scan_toks. It could possibly be 
extended to distinguish between \marks and \write etc. Comments 
more than welcome on this one!

I have also added an \ifalignscanning test. It is true whenever TeX 
is looking for \noalign etc. so is most useful for a 
\stopalignscanning function defined as 
  \def\stopalignscanning{\ifalignscanning\relax\fi}


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