An interesting default for recurselevel in xetex

An interesting default for recurselevel in xetex

[Aditya Mahajan]

Hi,

Guess what happens when you run this with xetex

\starttext\recurselevel\stoptext

This is a side effect of the definition of \dofastrecurse. After using 
\dofastrecurse, the default value of recurselevel is 
\number\fastrecursecounter rather than 0. I don't think that this will 
have any side effects.

Aditya
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Re: An interesting default for recurselevel in xetex

[Hans Hagen]

Aditya Mahajan wrote:
> Hi,
> 
> Guess what happens when you run this with xetex
> 
> \starttext\recurselevel\stoptext
> 
> This is a side effect of the definition of \dofastrecurse. After using 
> \dofastrecurse, the default value of recurselevel is 
> \number\fastrecursecounter rather than 0. I don't think that this will 
> have any side effects.

no, it's just the last value; of course i can set it to zero

recurselevel is also known inside \doloop so there it makes sense to 
have it afterrwards (or when using \exitloop in any case)

Hans

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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
      tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
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Re: An interesting default for recurselevel in xetex

[Aditya Mahajan]

On Sun, 23 Aug 2009, Hans Hagen wrote:

> Aditya Mahajan wrote:
>> Hi,
>> 
>> Guess what happens when you run this with xetex
>> 
>> \starttext\recurselevel\stoptext
>> 
>> This is a side effect of the definition of \dofastrecurse. After using 
>> \dofastrecurse, the default value of recurselevel is 
>> \number\fastrecursecounter rather than 0. I don't think that this will have 
>> any side effects.
>
> no, it's just the last value; of course i can set it to zero
>
>
> recurselevel is also known inside \doloop so there it makes sense to have it 
> afterrwards (or when using \exitloop in any case)

Both \dorecurse and \doloop leave the value of \recurselevel to its 
previous value. \dofastrecurse does not and sets it to the last value.

\starttext
\recurselevel

\dorecurse{6}{Hello }
\recurselevel

\doloop{\ifnum\recurselevel>6\relax \exitloop\else again  \fi}
\recurselevel

\dofastrecurse{1}{6}{1}{and again}
\recurselevel
\stoptext

I do not think that any change is needed (One shouldn't use \recurselevel 
outside a recursion macro anyways). I was just surprised to find that 
recurselevel was defaulting to such a weird value in xetex.

Aditya
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Re: An interesting default for recurselevel in xetex

[Hans Hagen]

Aditya Mahajan wrote:

> I do not think that any change is needed (One shouldn't use 
> \recurselevel outside a recursion macro anyways). I was just surprised 
> to find that recurselevel was defaulting to such a weird value in xetex.

also in luatex but that will probably change once we have more direct 
access at the lua end

anyhow, here's teh way out

\def\dodofastrecurse
   {\ifnum\fastrecursecounter>\lastrecursecounter
      \let\recurselevel\!!zerocount
    \else
      \fastrecursebody
      \advance\fastrecursecounter\steprecursecounter
      \expandafter\dodofastrecurse
    \fi}


Hans


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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
      tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
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