Re: syntax for numbercommand and \gobbleoneargument

[Hans Hagen <pragma@wxs.nl>]

Sanjoy Mahajan wrote:
> This minimal file [case 1]:
>
> \setuphead[chapter][numbercommand={\gobbleoneargument}
> ]
> \starttext
> \chapter{One}
> \stoptext
>
> fails.  Whereas if the first two lines are replaced by [case 2]:
>   
in this case the command is

"{\gobbleoneargument} "

and

{\gobbleoneargument} {some text}

will fail because gobble runs into an }

> \setuphead[chapter][numbercommand={\gobbleoneargument},
> ]
>   
in this case the command is

{\gobbleoneargument"

and

\gobbleoneargument{some text}

work sok
> or [case 3]:
>
> \setuphead[chapter][numbercommand={\gobbleoneargument}]
>
> then it's fine.  Is this a bug or a feature of TeX's tricky spacing
> rules?  And how can I think about ConTeXt's parsing in way that the
> difference between cases 1 and 2,3 is obvious?
>   
idem

it's

[key=value]

[key=value, nextkey=nextvalue]

(spaces are dropped after the comma) so in 

[key=value ,nextkey=nextvalue]

the comma before the , is part of key's value 





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