Re: redefining xmlsetups inside a XML document - mf via ntg-context

From: mf via ntg-context <ntg-context@ntg.nl>
To: Hans Hagen <j.hagen@xs4all.nl>,
	mailing list for ConTeXt users <ntg-context@ntg.nl>
Cc: mf <massifr@fastwebnet.it>
Subject: Re: redefining xmlsetups inside a XML document
Date: Tue, 22 Mar 2022 15:23:37 +0100	[thread overview]
Message-ID: <70329b93-6ac9-a87f-be4b-860dd43b1e6e@fastwebnet.it> (raw)
In-Reply-To: <96fc7edb-8a9b-4ffe-3e10-fadd15ed130a@xs4all.nl>

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I found the solution I was looking for. The command to run is still

context --environment=nested-xmlsetup.tex --forcexml nested-xmlsetup.xhtml

In the <script> element there's some tex code, which redefines the 
xmlsetups for <p> and <i> elements, coloring the first ones in red and 
the second ones in blue.

The key command is

\xmlsetsetup{\xmldocument}{p|i}{myHtml:*}

where \xmldocument instead of #1 applies the myHtml:* setups to the 
whole XHTML document and not only to the <script> element identified by #1.

I tried also this, to prevent redefining the setups of <html>, <head>, 
<script> elements:

\xmlsetsetup{\xmlfirst{\xmldocument}{body}}{p|i}{myHtml:*}

but it doesn't work, since \xmldocument seems to be the actual document 
instead of an id pointing to its root element.

Massi

Il 10/03/22 17:52, Hans Hagen ha scritto:
> On 3/10/2022 4:59 PM, mf via ntg-context wrote:
>> Hello,
>> I'm trying to add new templates (xmlsetups) from the XML document itself.
>>
>> See the attached MWE.
>>
>> - the XML document is a simple XHTML file
>>
>> - in the "head" element there's a "script" element with the "type" 
>> attribute set to "text/vnd.context", whose contents are then passed to 
>> \xmlcontext
>>
>> - the "body" element has a "data-xmlsetups" attribute whose value 
>> should tell which xmlsetups is to be applied on the body contents 
>> (it's defined in the "script" element above)
>>
>> If it worked, the resulting PDF should show the body element, followed 
>> by a "Hello world!" paragraph written in red.
>> But it does not work, because there's something I'm missing in the 
>> redefinition and application of xmlsetups.
>>
>> To try the MWE, type:
>>
>> context --environment=nested-xmlsetup.tex --forcexml 
>> nested-xmlsetup.xhtml
>      <script type="text/vnd.context">
>        \startxmlsetups myHtml
>         \xmlsetsetup{#1}{p}{myHtml:p}
>         % you're missing this
>         \xmlsetup{#1}{xml:process}
>         % which is
>         %  \xmlregistereddocumentsetups{#1}{#1}
>         %  \xmlmain{#1}
>        \stopxmlsetups
> 
>        \startxmlsetups myHtml:p
>           \dontleavehmode\red\xmlflush{#1}\par
>        \stopxmlsetups
>      </script>
> 

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[-- Attachment #3: nested-xmlsetup.tex --]
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\startxmlsetups html
  \xmlsetsetup{#1}{{html|head}}{html:flush}
  \xmlsetsetup{#1}{{html head script}}{html:script:context}
  \xmlsetsetup{#1}{{html body}}{html:body}
  \xmlsetsetup{#1}{p|i}{html:*}
\stopxmlsetups

\startxmlsetups html:flush
  \xmlflush{#1}
\stopxmlsetups

\startluacode
function xml.functions.parseScript(s)
  local mimetype = s and s.at and s.at.type
  if mimetype and mimetype == "text/vnd.context" then
    lxml.context(s)
  end
end
\stopluacode

\startxmlsetups html:script:context
  \xmlfunction{#1}{parseScript}
\stopxmlsetups

\startxmlsetups html:body
  \starttext
    \xmlflush{#1}
  \stoptext
\stopxmlsetups

% default setup for paragraphs
\startxmlsetups html:p
  \dontleavehmode\xmlflush{#1}\par
\stopxmlsetups

% default setup for italic inlines
\startxmlsetups html:i
  {\it\xmlflush{#1}}%
\stopxmlsetups

\xmlregistersetup{html}

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