[NTG-context] XML: calculations on attribute values before output

Duncan Hothersall dh at capdm.com
Thu May 5 10:37:43 CEST 2022


Thanks so much Taco, that opens the door to a lot for me. It's a tricky
learning curve.

Just in case anyone else is copying code in future for CALS, there's a tiny
tweak to the rows calculation, it should be (t.at.morerows or 0) + 1.

I see a route to solving lots of other problems here too. Thanks again.

Duncan

On Thu, 5 May 2022 at 08:21, Taco Hoekwater <taco at bittext.nl> wrote:

>
>
> > On 4 May 2022, at 22:10, Duncan Hothersall via ntg-context <
> ntg-context at ntg.nl> wrote:
> >
> > Hi.
> >
> > I'm processing an XML table and need to set a row span. Because we use a
> variant of the CALS table model, spans are defined by an attribute saying
> how many *additional* rows should be spanned, as opposed to how many *in
> total*. So to translate this into TABLE \bTD[nr=X] syntax I need to add 1.
> >
> > I'm guessing this is very easily doable (in lua?) but I've tried various
> permutations and can't work it out. If anyone could give me a pointer that
> would be great.
> >
> > (In reality I'm going to need to handle lots of other conversions of
> attribute values into \bTD[...] commands, so if there's a generalised way
> of doing that sort of thing, or even better if someone has already tackled
> CALS tables in this way, that would also be great!)
>
> Not CALS, but I do a lot of HTML table processing. I find it all much
> easier on the lua side, because there the
> attributes are just in a table entry of the argument node t ( t.at ):
>
> set up a lua function in the setups:
>
> \startxmlsetups xml:demo:base
>  \xmlsetsetup{#1}{*}{xml:demo:*}
>  \xmlsetfunction {\xmldocument}{entry}{userdata.xmlfunctions.entry}
> \stopxmlsetups
>
> and then add this lua code:
>
> \startluacode
> userdata.xmlfunctions = {}
> function userdata.xmlfunctions.entry (t)
>   local rows = (t.at.morerows or 1) + 1
>   context.bTD({nr=rows})
>   lxml.flush(t)
>   context.eTD()
> end
> \stopluacode
>
> All of the tex-side commands also exist in lua, in the lxml and/or xml
> table, e.g.:
>
> direct output flushing:
>   lxml.flush(t)
>   lxml.all(t, ‘entry’)
>
> filter for processing:
>   for b in xml.collected(lxml.getid(t),'../row/entry') do … end
>
>
> (those are the ones I use a lot, there are many more)
>
> Best wishes,
> Taco



-- 
Duncan Hothersall, Operations Director
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