[NTG-pdftex] [ pdftex-Patches-466 ] \primitive and \ifprimitive

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Patches item #466, was opened at 2006-01-07 17:22
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Category: Primitives
Group: v1.40.0
Status: Open
>Resolution: Accepted
Priority: 4
Submitted By: Taco Hoekwater (taco)
Assigned to: Martin Schröder (oneiros)
Summary: \primitive and \ifprimitive

Initial Comment:
This patch implements two new primitives:

  \primitive \par

This will run the 'primitive' command \par, even if it 
has been re- or undefined in the meantime. \primitive
is not expandable, because it may be asked to execute
unexpandable primitives as well as expandable ones.

If you supply a nonexistant primitive, it will be 
ignored (no error is raised).

The second primitive is a new type of \if:

  \ifprimitive \par ... \else .. \fi

returns true if the current meaning of \par is the
'primitive' command \par.


The patch is against alpha-20051226, i hope that is not 
too old (?). I expect to do at least one minor update 
during the beta cycle, after the pdftex code is 
flattened. It was quite a struggle to make this 
change file work ok, and as a result, there are 
a few ugly web hacks.


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