On Sun, 16 Jan 2011, Wolfgang Schuster wrote:

>
> Am 15.01.2011 um 23:57 schrieb Aditya Mahajan:
>
>> What is the best way to define the equivalent of
>>
>>    \setvalue{\e!start\NAME}{...}
>>
>> in lua.
>>
>>    e_start = ??
>>    context.setvalue(e_start .. name, "...")
>
> \startluacode
> context.setvalue("foo","\\framedtext")
> context.setvalue(table.concat({"start","foo"}),"\\startframedtext")
> context.setvalue(table.concat({"stop" ,"foo"}),"\\stopframedtext" )
> \stopluacode
>
> \starttext
> \foo{foo}
> \startfoo bar\stopfoo
> \stoptext
>
This would just create \startfoo. \setvalue{\e!start foo} creates a 
interface specific command. The code that Hans posted does that. I am 
sorry that this was not clear in the question.

> You can also write “context.setvalue("start".."foo","…")” but table.concat
> looks better

OK.

> but the question is why don’t you use just tex
> to create the start/stop commands.

Because I find it much easier to understand expansion at lua level than at 
TeX level.

Thanks,
Aditya