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From: Hans Hagen <pragma@wxs.nl>
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Subject: Re: (pdfe)TeX register clash?
Date: Fri, 16 Nov 2001 09:41:38 +0100
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At 08:07 PM 11/15/2001 -0500, F. Miller Maley wrote:
>Hans Hagen wrote:
> > Context offers \newcount and \newbox (although the implementation is
> > adapted to etex's >256 register count; i don't use the original etex 
> macros).
> >
> > So, there must be something else going on. How does the macro that uses 
> the
> > counter look? Maybe there is some unsafe testing going on there (lookahead
> > problem).
>
>Thank you, this answers my question, and made me realize where my bug was.
>Things are now working as expected, but perhaps there is a better solution
>than the hack I came up with.  My real question is this:
>
>Suppose I want to format something (a table, a section title) differently
>depending on whether it appears on a left or right page.  I promise that
>the two formats (left/right) will behave the same with regard to page
>breaking.  What is the cleanest way to do this?
>
>My idea was to (1) use the cross-reference mechanism to make a self-reference,
>(2) extract the page number from the reference into a counter and (3) test it
>with \ifodd.  Step (2) was a bit tricky, and my solution unfortunately relies
>on ConTeXt internal macros (\doifreferencefoundelse, etc.).

there are two ways to do this:

\getpagestatus after which you can use \ifrightpage ....

watch out, \getpagestatus inserts a node

you can also try : \doifrightpageelse{...}{...}, but here you need to 
insert the \signalrightpage node yourself.

These mechanisms may merge some day. Both adapt themselves to 
single/doublesides and use two pass data (which is more efficient than 
references)

Concerning references:

\doifreferencefoundelse{blabla}
   {.... \currentrealreference holds the pagenumber which you can test on odd}
   {...}

Hans
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                                   Hans Hagen | PRAGMA ADE | pragma@wxs.nl
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