xml in lua advice ?

xml in lua advice ?

[Taco Hoekwater]

Hi,

Is there a more elegant way to feed an xml tree into a context() command
that what I have below?


\startluacode
function xml.functions.heading(t)
   context.section("{")
   lxml.flush(t)
   context("}")
end
\stopluacode

The subtree in ’t’ could have embedded xml tags that should be processed, 
so just stripping it clean will not do.

(this is not about \section as such, I just needed an example. \startsection
would be more modern, but it would not help fix the issue )

Thanks for any help,

Taco




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Re: xml in lua advice ?

[Hans Hagen]

On 9/19/2018 2:50 PM, Taco Hoekwater wrote:
> Hi,
> 
> Is there a more elegant way to feed an xml tree into a context() command
> that what I have below?
> 
> 
> \startluacode
> function xml.functions.heading(t)
>     context.section("{")
>     lxml.flush(t)
>     context("}")
> end
> \stopluacode
> 
> The subtree in ’t’ could have embedded xml tags that should be processed,
> so just stripping it clean will not do.
> 
> (this is not about \section as such, I just needed an example. \startsection
> would be more modern, but it would not help fix the issue )
it actually depends on what you do ... anyway here is some insight (as 
xml-tex old-timer you'll probably recognize the madness)

% \enabletrackers[context*]

\starttext

% here is your missing mwe

\startbuffer[test]
<document>
     <section>some <b>bold</b> title</section>
</document>
\stopbuffer

% this will assume xml and relate some handlers

\setuphead[section]
   [coding=xml,
    xmlsetup=xml:flush]

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

% comment this one for your amusement

\startxmlsetups xml:b
     {\bf \xmlflush{#1}}
\stopxmlsetups

% here is the magic: you pass a reference

\startluacode
function xml.finalizers.heading(t)
     context.formatted.section("main::%i",t[1].ix)
end
\stopluacode

% this loads only (can happen at the lua end ... you can sort that out)

\xmlloadbuffer{main}{test}{}

% this indexes the nodes (the ix keys, basically all these #1 argumehnts 
in setups use that trickery)

\xmladdindex{main}

% to be sure

\xmlsetsetup{main}{b}{xml:b}

% now we filter / apply your finalizer

\xmlfilter{main}{section/heading()}

% done

\stoptext




-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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___________________________________________________________________________________

Re: xml in lua advice ?

[mf]

My 2 cents:

local xmlflush = lxml.flush

local function text_or_xml(...)
  for i,v in ipairs(arg) do
    if "table" == type(v) then
      xmlflush(v)
    else
      context(v)
    end
  end
end

function xml.functions.heading(t)
  text_or_xml( "\\section{" , t , "}" )
end

Massimiliano

Il giorno mer, 19/09/2018 alle 15.56 +0200, Hans Hagen ha scritto:
> On 9/19/2018 2:50 PM, Taco Hoekwater wrote:
> > Hi,
> > 
> > Is there a more elegant way to feed an xml tree into a context()
> > command
> > that what I have below?
> > 
> > 
> > \startluacode
> > function xml.functions.heading(t)
> >     context.section("{")
> >     lxml.flush(t)
> >     context("}")
> > end
> > \stopluacode
> > 
> > The subtree in ’t’ could have embedded xml tags that should be
> > processed,
> > so just stripping it clean will not do.
> > 
> > (this is not about \section as such, I just needed an example.
> > \startsection
> > would be more modern, but it would not help fix the issue )
> 
> it actually depends on what you do ... anyway here is some insight
> (as 
> xml-tex old-timer you'll probably recognize the madness)
> 
> % \enabletrackers[context*]
> 
> \starttext
> 
> % here is your missing mwe
> 
> \startbuffer[test]
> <document>
>      <section>some <b>bold</b> title</section>
> </document>
> \stopbuffer
> 
> % this will assume xml and relate some handlers
> 
> \setuphead[section]
>    [coding=xml,
>     xmlsetup=xml:flush]
> 
> \startxmlsetups xml:flush
>      \xmlflush{#1}
> \stopxmlsetups
> 
> % comment this one for your amusement
> 
> \startxmlsetups xml:b
>      {\bf \xmlflush{#1}}
> \stopxmlsetups
> 
> % here is the magic: you pass a reference
> 
> \startluacode
> function xml.finalizers.heading(t)
>      context.formatted.section("main::%i",t[1].ix)
> end
> \stopluacode
> 
> % this loads only (can happen at the lua end ... you can sort that
> out)
> 
> \xmlloadbuffer{main}{test}{}
> 
> % this indexes the nodes (the ix keys, basically all these #1
> argumehnts 
> in setups use that trickery)
> 
> \xmladdindex{main}
> 
> % to be sure
> 
> \xmlsetsetup{main}{b}{xml:b}
> 
> % now we filter / apply your finalizer
> 
> \xmlfilter{main}{section/heading()}
> 
> % done
> 
> \stoptext
> 
> 
> 
> 
> -----------------------------------------------------------------
>                                            Hans Hagen | PRAGMA ADE
>                Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>         tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
> -----------------------------------------------------------------
> _____________________________________________________________________
> ______________
> If your question is of interest to others as well, please add an
> entry to the Wiki!
> 
> maillist : ntg-context@ntg.nl / 
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> _____________________________________________________________________
> ______________

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: xml in lua advice ?

[Taco Hoekwater]

Hi,

> it actually depends on what you do ... anyway here is some insight (as xml-tex old-timer you'll probably recognize the madness)

What I am mostly trying to do is to have as much of the xml processing in lua 
as possible.

> 
> % \enabletrackers[context*]
> 
> \starttext
> 
> % here is your missing mwe

Yes, sorry about that. My question was intended to be more of an
documentation-related one. 

Using your MWE as guideline, my minimal file looks like this:

% BEGIN ENVIRONMENT
\startluacode
function xml.functions.document(t) 
   lxml.flush(t) 
end
function xml.functions.b(t)
   context.start()
   context.bf()
   lxml.flush(t)
   context.stop()
   context("{}")
end
function xml.functions.section(t)
  context.section("{")
  lxml.flush(t)
  context("}")
end
\stopluacode

\startxmlsetups mysetups % to be converted to lua later
  \xmlsetfunction {main}{document}{xml.functions.document}
  \xmlsetfunction {main}{section} {xml.functions.section}  
  \xmlsetfunction {main}{b}       {xml.functions.b}
\stopxmlsetups

\xmlregistersetup{mysetups} % to be converted to lua later
 
% XML normally in separate file
\starttext
\startbuffer[test]
<document>
   <section>some <b>bold</b> title</section>
</document>
\stopbuffer

\xmlprocessbuffer{main}{test}{}

\stoptext
% END EXAMPLE


I know it would be simple to write e.g.

  \startsetups xml:section
    \section{\xmlflush{#1}}
  \stopsetups

but I was aiming for a simple, clean-looking CLD as style setup of the XML 
document. I doubt I could explain your MWE to one of my coworkers, as I 
hardly understand it myself :)

What I was really hoping for was something like the fictional:

  function xml.functions.section(t)
    context.section(lxml.process_into_context_string(t))
  end

or some CLD extension so that it would actually understand

  function xml.functions.section(t)
    context.section(lxml.flush(t))
  end

I hope this makes more sense now. Unless something magical is possible,
it seems my best bet is to stick with \startsetups instead of lua for
these cases, just to make sure I can explain to the rest of the office
what is going on.

Thanks,
Taco





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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________