[NTG-context] eating up &

[Peter Rolf]

Hans van der Meer wrote:
> I want to do something with & in tables (making it an active column
> separator).
> Now I have a macro with two arguments for parameters in Context style:
> 
> \def\starttablex{\dodoubleargument\dostarttablex}
                            ^^^^^^^^
Shouldn't this be \dodoubleempty for optional arguments?

Peter

> \def\dostarttablex[#1][#2]{%
> 
> Now for input: \starttable[][] & ... all is well,
> but for input: \starttable[]   & ... the ampersand appears to be eaten
> up by the double argument expansion.
> 
> How can I prevent that, letting & end the parameter scanning and using
> it as the first input?
> 
> Hans van der Meer
> 
> 
> 
> 
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