xml syntax for \externalfigure

xml syntax for \externalfigure

[Thomas A. Schmitz]

Hi all,

I'm pulling my hair - thought this was easy, but turns out to be more difficult. The \externalfigure command can take a width and/or a height parameter, and context will be happy to take either one into account. I'm trying to translate that into xml syntax. Here's a minimal example that I can't make work. If anyone can explain what to do here, I might be able to work this out (or will be back with more questions :-)

\startbuffer[test]
<a>
  <externalfigure height="1cm" resource="hacker"/>
</a>
\stopbuffer

\startxmlsetups xml:testsetups
\xmlsetsetup{\xmldocument}{a|externalfigure}{xml:*}
\stopxmlsetups

\xmlregistersetup{xml:testsetups}

\startxmlsetups xml:a
  \xmlflush{#1}\par
\stopxmlsetups 

\startxmlsetups xml:externalfigure
  \externalfigure[\xmlatt{#1}{resource}]
                 [\doifnotempty{\xmlatt{#1}{height}}{height=\xmlatt{#1}{height}}]
\stopxmlsetups

\starttext
\xmlprocessbuffer{main}{test}{}
\stoptext 

The "height" attribute is not taken into account - why? 

All best

Thomas
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Re: xml syntax for \externalfigure

[Aditya Mahajan]

On Fri, 3 Jun 2011, Thomas A. Schmitz wrote:

> Hi all,
>
> I'm pulling my hair - thought this was easy, but turns out to be more difficult. The \externalfigure command can take a width and/or a height parameter, and context will be happy to take either one into account. I'm trying to translate that into xml syntax. Here's a minimal example that I can't make work. If anyone can explain what to do here, I might be able to work this out (or will be back with more questions :-)
>
> \startbuffer[test]
> <a>
>  <externalfigure height="1cm" resource="hacker"/>
> </a>
> \stopbuffer
>
> \startxmlsetups xml:testsetups
> \xmlsetsetup{\xmldocument}{a|externalfigure}{xml:*}
> \stopxmlsetups
>
> \xmlregistersetup{xml:testsetups}
>
> \startxmlsetups xml:a
>  \xmlflush{#1}\par
> \stopxmlsetups
>
> \startxmlsetups xml:externalfigure
>  \externalfigure[\xmlatt{#1}{resource}]
>                 [\doifnotempty{\xmlatt{#1}{height}}{height=\xmlatt{#1}{height}}]
> \stopxmlsetups

(untested)

\exeternalfigure[...][height=\doifemptyelse{\xmlatt{#1}{height}}{fit}{\xmlatt{#1}{height}}]

Aditya
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___________________________________________________________________________________

Re: xml syntax for \externalfigure

[Thomas A. Schmitz]

On Jun 3, 2011, at 9:57 PM, Aditya Mahajan wrote:

> (untested)
> 
> \exeternalfigure[...][height=\doifemptyelse{\xmlatt{#1}{height}}{fit}{\xmlatt{#1}{height}}]
> 
> Aditya

Hmm, almost... Gives the dreaded "Missing number, treated as zero" error. But your "fit" gave me an idea: this works:

[height=\xmlattdef{#1}{height}{fit}]

but only if I have a real dimension as in height="5cm". What if I want to define something like height="0.4" and want this to be the equivalent of height=0.4\textheight ? This of course doesn't work:

[height=\xmlattdef{#1}{height}{fit}\textheight]

since it will expand to "fit\textheight" as a default option. Any suggestions?

Thomas
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___________________________________________________________________________________

Re: xml syntax for \externalfigure

[Thomas A. Schmitz]

On Jun 3, 2011, at 10:19 PM, Thomas A. Schmitz wrote:

> Hmm, almost... Gives the dreaded "Missing number, treated as zero" error. But your "fit" gave me an idea: this works:
> 
> [height=\xmlattdef{#1}{height}{fit}]
> 
> but only if I have a real dimension as in height="5cm". What if I want to define something like height="0.4" and want this to be the equivalent of height=0.4\textheight ? This of course doesn't work:
> 
> [height=\xmlattdef{#1}{height}{fit}\textheight]
> 
> since it will expand to "fit\textheight" as a default option. Any suggestions?
> 
> Thomas

Answering my own question: this isn't pretty, but it does what I need at this moment:

\startxmlsetups xml:externalfigure
	\doifemptyelse {\xmlatt{#1}{heigth}}
	{\externalfigure[\xmlatt{#1}{resource}]
		       [width=\xmlatt{#1}{width}\textwidth]}
	{\externalfigure[\xmlatt{#1}{resource}]
		       [height=\xmlatt{#1}{height}\textheight]}
\stopxmlsetups

So I'll leave it at that...

Thomas
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Re: xml syntax for \externalfigure

[Hans Hagen]

On 3-6-2011 10:19, Thomas A. Schmitz wrote:
>
> On Jun 3, 2011, at 9:57 PM, Aditya Mahajan wrote:
>
>> (untested)
>>
>> \exeternalfigure[...][height=\doifemptyelse{\xmlatt{#1}{height}}{fit}{\xmlatt{#1}{height}}]
>>
>> Aditya
>
> Hmm, almost... Gives the dreaded "Missing number, treated as zero" error. But your "fit" gave me an idea: this works:
>
> [height=\xmlattdef{#1}{height}{fit}]
>
> but only if I have a real dimension as in height="5cm". What if I want to define something like height="0.4" and want this to be the equivalent of height=0.4\textheight ? This of course doesn't work:
>
> [height=\xmlattdef{#1}{height}{fit}\textheight]
>
> since it will expand to "fit\textheight" as a default option. Any suggestions?

something (slow):

\expdoifelse
   {\xmlattdef{#1}{height}{fit}
   {fit}
   {\xmlatt{#1}{height}\textheight}

(of you define a lua helper)

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
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___________________________________________________________________________________

Re: xml syntax for \externalfigure

[Thomas A. Schmitz]

On Jun 3, 2011, at 10:50 PM, Hans Hagen wrote:

> On 3-6-2011 10:19, Thomas A. Schmitz wrote:
>> 
>> Hmm, almost... Gives the dreaded "Missing number, treated as zero" error. But your "fit" gave me an idea: this works:
>> 
>> [height=\xmlattdef{#1}{height}{fit}]
>> 
>> but only if I have a real dimension as in height="5cm". What if I want to define something like height="0.4" and want this to be the equivalent of height=0.4\textheight ? This of course doesn't work:
>> 
>> [height=\xmlattdef{#1}{height}{fit}\textheight]
>> 
>> since it will expand to "fit\textheight" as a default option. Any suggestions?
> 
> something (slow):
> 
> \expdoifelse
>  {\xmlattdef{#1}{height}{fit}
>  {fit}
>  {\xmlatt{#1}{height}\textheight}
> 
> (of you define a lua helper)
> 
Ah, expdoifelse is for "expanded doifelse," right? Any examples for such a lua helper? Sounds good, but I still haven't been able to understand how to mix xml and lua code.

Thanks!

Thomas
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___________________________________________________________________________________

Re: xml syntax for \externalfigure

[Peter Münster]

On Fri, Jun 03 2011, Thomas A. Schmitz wrote:

> Ah, expdoifelse is for "expanded doifelse," right? Any examples for such a lua
> helper? Sounds good, but I still haven't been able to understand how to mix
> xml and lua code.

\startluacode
function my_externalfigure(file, t)
    local args_present
    for k, v in pairs(t) do
        if v == "" then
            t[k] = nil
        else
            args_present = true
        end
    end
    context.externalfigure({file}, args_present and t)
end
\stopluacode

\startxmlsetups xml:externalfigure
  \ctxlua{my_externalfigure("\xmlatt{#1}{resource}",
    {width = "\xmlatt{#1}{width}", height = "\xmlatt{#1}{height}"})}
\stopxmlsetups

My first idea was "\expanded{\externalfigure[...][\doif...]}" but it
does not work...

-- 
           Peter
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Re: xml syntax for \externalfigure

[Hans Hagen]

On 4-6-2011 12:14, Peter Münster wrote:
> On Fri, Jun 03 2011, Thomas A. Schmitz wrote:
>
>> Ah, expdoifelse is for "expanded doifelse," right? Any examples for such a lua
>> helper? Sounds good, but I still haven't been able to understand how to mix
>> xml and lua code.
>
> \startluacode
> function my_externalfigure(file, t)
>      local args_present
>      for k, v in pairs(t) do
>          if v == "" then
>              t[k] = nil
>          else
>              args_present = true
>          end
>      end
>      context.externalfigure({file}, args_present and t)
> end
> \stopluacode
>
> \startxmlsetups xml:externalfigure
>    \ctxlua{my_externalfigure("\xmlatt{#1}{resource}",
>      {width = "\xmlatt{#1}{width}", height = "\xmlatt{#1}{height}"})}
> \stopxmlsetups
>
> My first idea was "\expanded{\externalfigure[...][\doif...]}" but it
> does not work...

you can consider passing #1 and using lxml.att at the lua end or go even 
further and pop in your own finalizer

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | 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
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___________________________________________________________________________________

Re: xml syntax for \externalfigure

[Thomas A. Schmitz]

On Jun 4, 2011, at 12:14 AM, Peter Münster wrote:

> \startluacode
> function my_externalfigure(file, t)
>    local args_present
>    for k, v in pairs(t) do
>        if v == "" then
>            t[k] = nil
>        else
>            args_present = true
>        end
>    end
>    context.externalfigure({file}, args_present and t)
> end
> \stopluacode
> 
> \startxmlsetups xml:externalfigure
>  \ctxlua{my_externalfigure("\xmlatt{#1}{resource}",
>    {width = "\xmlatt{#1}{width}", height = "\xmlatt{#1}{height}"})}
> \stopxmlsetups
> 
> My first idea was "\expanded{\externalfigure[...][\doif...]}" but it
> does not work...

Thanks a lot Peter, i will have to play with this tomorrow (just came home from a short trip).

Thomas
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