[luatex] First (optional?) arguments of tex.getcount and friends.

Paul Isambert zappathustra at free.fr
Tue May 10 16:04:09 CEST 2011

Le 10/05/2011 15:44, Taco Hoekwater a écrit :
> On 05/10/2011 03:42 PM, Paul Isambert wrote:
>> Hello all,
>> I have noticed that the function tex.getcount() and similar can take any
>> number of arguments and ignore them all but the last. E.g.:
>> \directlua{
>> texio.write_nl(tex.getcount("a string", nothing, node.new(11), 55, 0))
>> }
>> returns "1", i.e. the value of count 0, ignoring the string, the nil
>> value, the node, and the number.
>> Is that normal? Am I missing something? My LuaTeX is 0.71.
> I am not surprised: lua pushes the arguments on a stack, and then the
> getcount function takes the topmost entry. I could add an explicit
> test for the number of arguments, but that is a bit of wasted effort,
> in Hans' and my opinion.

Well, that could be useful in the quite unlikely situation where you 
pass several arguments to a function whose definition and number of 
arguments might change and you expect it to discard the last ones if 
necessary. Admittedly not worth the test.

Thanks for the explanation,

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