[NTG-context] XML processing instructions

[Duncan Hothersall]

Apologies, there are two rogue * in the lxml.preprocessor code, but even
when they are removed it doesn't work.

On Mon, 2 May 2022 at 08:19, Duncan Hothersall <dh at capdm.com> wrote:

> I have a big set of existing XML books (held in a derivative of DocBook)
> which I'm looking to start processing directly with ConTeXt. (Up to now I
> have a system which converts the XML into ConTeXt code which is then
> processed, but this is inefficient and lots of the code is now unsupported.)
>
> I've had some success producing output, but my first real sticking point
> has come with processing instructions. The existing XML contains lots of
> processing instructions of the form
> <?capdm whatever?>, some of which can be conditional and introduce new
> data etc. But I'd be happy at this stage if I could just process the most
> basic one of them, which is used to introduce a line stop in a running
> paragraph of text.
>
> My best guess at how to do this was to use the lxml.preprocessor function
> to convert the processing instruction into an element, and then process the
> element as normal. But (a) my attempt didn't work, and (b) there may well
> be a better way.
>
> Minimal working example below, except that obviously the processing
> instruction bit doesn't work!
>
> Thanks for any help or insights.
>
> Duncan
>
>
> MWE:
> ------
>
> \startbuffer[demo]
> <book>
>   <para>A paragraph with<?capdm force_line_stop?>a processing
> instruction.</para>
> </book>
> \stopbuffer
>
> \startxmlsetups xml:demo:base
>  \xmlsetsetup{#1}{*}{xml:demo:*}
> \stopxmlsetups
> \xmlregisterdocumentsetup{demo}{xml:demo:base}
>
> \startxmlsetups xml:demo:book
>  \xmlflush{#1}
> \stopxmlsetups
>
> \startxmlsetups xml:demo:para
>  \xmlflush{#1}\endgraf
> \stopxmlsetups
>
> \startluacode
>  function lxml.preprocessor(data,settings)
>   return string.find(data,"<?capdm *force_line_stop?>")
>    and string.gsub(data,"<?capdm
> *force_line_stop?>","<capdmlinestop></capdmlinestop/>")
>    or data
>  end
> \stopluacode
>
> \startxmlsetups xml:demo:capdmlinestop
>  \crlf
>  \xmlflush{#1}
> \stopxmlsetups
>
> \setupbodyfont[modern]
> \starttext
> \xmlprocessbuffer{demo}{demo}{}
> \stoptext
>
> ------
>


-- 
Duncan Hothersall, Operations Director
CAPDM Limited - Online Program Enablers
0131 677 2400  www.capdm.com
Registered in Scotland: SC168970       VAT: 682 846 983
Registered address: 20 Forth Street Edinburgh EH1 3LH UK
<https://maps.google.com/?q=22+Forth+Street,+Edinburgh,+EH1+3LH,+UK&entry=gmail&source=g>

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