Re: atpage || number comparing

[Hans Hagen <pragma@wxs.nl>]

On 15-5-2012 14:28, Peter Schorsch wrote:
> Hi,
>
> it tried to do a \atpage command that results
> a) some page =>  nothing
> b) different page =>  pagenumber with some text (e.g. "auf Seite XY")
>
> \def\atPage[#1]%
> 	{\doifnot{\at[#1]}{\currentpage}%
> 	{\at[#1]}%
> 	}
>
> My problem with this is, that the \doifnot always results as not equal;
> it is like the types mismatch as if I exchange \at[#1] with a pure
> number the comparing works. If so, how can the types be corrected?
>
> Additionally - if possible - I would like to add case that the referred
> page is on the other page but in duplex mode adjacent to the actual
> page. Is that possible to do this? I unluckily dont know how to make
> working simple calculation in tex code.
>
> To be complete I found in the file strc-ref.mkiv some notes about a
> planed \atpage command:
>
> %D A still very rudimentary|/|experimental forward|/|backward
> %D reference mechanism is provided by the macro \type{\atpage}:
> %D
> %D \starttyping
> %D ... \somewhere{backward text}{forward text}[someref] ...
> %D ... \atpage[someref] ...
> %D \stoptyping
> %D
> %D In future versions there will be more sophisticated
>
> % 0 = no page reference
> % 1 = same page
> % 2 = preceding page
> % 3 = following page
> % 4 = backward, same page (todo)
> % 5 = forward, same page  (todo)
>
> But that level of the ambient tex is still out of my scope.

that comment can be deleted as \atpage is defined earlier on

anyhow, you can use

\startbuffer
\starttabulate[|l|l|l|l|]
     \NC one   \NC \atpage[one]   \NC \somewhere{(see before)}{(see 
later)}[one]   \NC \NR
     \NC two   \NC \atpage[two]   \NC \somewhere{(see before)}{(see 
later)}[two]   \NC \NR
     \NC three \NC \atpage[three] \NC \somewhere{(see before)}{(see 
later)}[three] \NC \NR
\stoptabulate
\stopbuffer

\starttext

     \section[one]  {One}   \getbuffer \page
     \section[two]  {Two}   \getbuffer \page
     \section[three]{Three} \getbuffer \page

\stoptext

the next variant (same functionality) is somewhat better

\unprotect

\unexpanded\def\somewhere#1#2#3[#4]% #dummy gobbles space around #2
   {\doifreferencefoundelse{#4}%
 
{\strc_references_by_reference_page_state{#4}{\goto{#1}[#4]}{}{\goto{#2}[#4]}}
      {[#4]}}

\protect




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                                           Hans Hagen | PRAGMA ADE
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