Re: \dorecurse and \recurselevel in Natural Tables

[Aditya Mahajan <adityam@umich.edu>]

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On Thu, 5 Mar 2009, luigi scarso wrote:

> On Thu, Mar 5, 2009 at 12:09 PM, Wolfgang Schuster
> <schuster.wolfgang@googlemail.com> wrote:
>>
>> Am 05.03.2009 um 01:17 schrieb luigi scarso:
>>
>>> \starttext
>>> %%% TeX version
>>> \bTABLE
>>> \dorecurse{5}
>>> {\bTR\expandafter \bTD \recurselevel. \eTD\expandafter
>>>        \bTD \recurselevel  \eTD\eTR}
>>> \eTABLE
>>>
>>> \dorecurse{2}
>>> {\recurselevel. \recurselevel\crlf}
>>
>> And you think it's a good idea to use \expandafter in your document?
> TeX  version, not context ... :)
> btw
> \expandafer is not so bad, if used moderatly .
>
>>
>> \expanded is the tool for users to get this result without knowledge
>> about TeX internals and expansion, this is from core-ntb:
>>
>> % permits \expanded{\bTD ... \eTD}
>>
>> \unexpanded\def\eTR{}
>> \unexpanded\def\eTD{}
>> \unexpanded\def\eTH{}
>> \unexpanded\def\eTN{}
> yes, of course one need to know about \expandafter... so is not so different .
> But it's context style.
>
>>
>>> %%% luatex version
>>> \startluacode
>>>   tprint = function(s) tex.sprint(tex.ctxcatcodes,s) end
>>>   tprint('\\bTABLE')
>>>   for j = 1,5 do
>>>       tprint('\\bTR')
>>>       tprint('\\bTD' .. j .. '.' .. '\\eTD' .. '\\bTD' .. j .. '\\eTD')
>>>       tprint('\\eTR')
>>>   end
>>>   tprint('\\eTABLE')
>>> \stopluacode
>>> \stoptext
>>
>> Nice solution and real alternative for package writers to avoid \expandafter
>> and \expanded but nothing for a normal user, I should keep this in my mind.
> Are you sure ?
> What is a normal user ?
> As soon as you use \dorecurse , you become a programmer .
>
> And sooner or later, everyone become a programmer, because it's
> impossible to write a format that satisfied
> all your needs .

My summary of this thread:
http://randomdeterminism.wordpress.com/2009/03/05/tex-programming-the-past-the-present-and-the-future/

Aditya

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