> On 4 May 2022, at 22:10, Duncan Hothersall via ntg-context
> <ntg-context@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
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