use of preceding-sibling in xmlsetsetup

use of preceding-sibling in xmlsetsetup

[massifr]

Hello list,
I need a lpath expression to intercept the first p (HTML paragraph) 
after a p of class "incipit". Here's a (not) working example:

\startbuffer[test]
<text>
  <p class="incipit">Dear list,</p>
  <p>this paragraph should not be indented, because it follows the “incipit”
  of the letter.</p>
  <p>This one and the following ones should be indented.</p>
  <p>You may question whether “Dear list,” should be a paragraph of his own,
  but my text is already formatted like that and I can’t do anything 
  about it.</p>
</text>
\stopbuffer

\startxmlsetups xml:somesetups
  \xmlsetsetup{#1}{text}{xml:text}
  \xmlsetsetup{#1}{p}{xml:p}
  \xmlsetsetup{#1}{p[@class='incipit']}{xml:p:noindent}
  % the following lpath expression does not work
  \xmlsetsetup{#1}{p[./preceding-sibling::[-1][@class = 'incipit']]}{xml:p:noindent}
\stopxmlsetups

\xmlregistersetup{xml:somesetups}

\startxmlsetups xml:text
  \indenting[{yes,first,12pt}]
  \xmlflush{#1}
\stopxmlsetups

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

\startxmlsetups xml:p:noindent
  \noindent\xmlflush{#1}\par
\stopxmlsetups

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

Thanks for any help.
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Re: use of preceding-sibling in xmlsetsetup

[massifr]

I've found a better solution:

\startxmlsetups xml:p
  \doif{\xmlattribute{#1}{reverse-sibling::p[1]}{class}}{incipit}{\noindent}%
  \xmlflush{#1}\par
\stopxmlsetups

Still I did not manage to put that rule in a xmlsetsetup.
Tried this:

\xmlsetsetup{#1}{p[reverse-sibling::p[1]/attribute('class') == 'incipit']}{xml:p:noindent}

but it does not work.

> Hello list,
> I need a lpath expression to intercept the first p (HTML paragraph) 
> after a p of class "incipit". Here's a (not) working example:
> 
> \startbuffer[test]
> <text>
>   <p class="incipit">Dear list,</p>
>   <p>this paragraph should not be indented, because it follows the “incipit”
>   of the letter.</p>
>   <p>This one and the following ones should be indented.</p>
>   <p>You may question whether “Dear list,” should be a paragraph of his own,
>   but my text is already formatted like that and I can’t do anything 
>   about it.</p>
> </text>
> \stopbuffer
> 
> \startxmlsetups xml:somesetups
>   \xmlsetsetup{#1}{text}{xml:text}
>   \xmlsetsetup{#1}{p}{xml:p}
>   \xmlsetsetup{#1}{p[@class='incipit']}{xml:p:noindent}
>   % the following lpath expression does not work
>   \xmlsetsetup{#1}{p[./preceding-sibling::[-1][@class = 'incipit']]}{xml:p:noindent}
> \stopxmlsetups
> 
> \xmlregistersetup{xml:somesetups}
> 
> \startxmlsetups xml:text
>   \indenting[{yes,first,12pt}]
>   \xmlflush{#1}
> \stopxmlsetups
> 
> \startxmlsetups xml:p
>   \xmlflush{#1}\par
> \stopxmlsetups
> 
> \startxmlsetups xml:p:noindent
>   \noindent\xmlflush{#1}\par
> \stopxmlsetups
> 
> \starttext
>   \xmlprocessbuffer{main}{test}{}
> \stoptext
> 
> Thanks for any help.

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___________________________________________________________________________________

Re: use of preceding-sibling in xmlsetsetup

[Thomas A. Schmitz]

On 10/14/2015 01:34 PM, massifr@fastwebnet.it wrote:
> I've found a better solution:
>
> \startxmlsetups xml:p
>    \doif{\xmlattribute{#1}{reverse-sibling::p[1]}{class}}{incipit}{\noindent}%
>    \xmlflush{#1}\par
> \stopxmlsetups
>
> Still I did not manage to put that rule in a xmlsetsetup.
> Tried this:
>
> \xmlsetsetup{#1}{p[reverse-sibling::p[1]/attribute('class') == 'incipit']}{xml:p:noindent}
>
> but it does not work.

I'm not sure if the "sibling" part of xpath syntax has been integrated 
into context. The best I can come up with is a hack which may help:

\startbuffer[test]
<text>
   <p class="incipit">Dear list,</p>
   <p>this paragraph should not be indented, because it follows the 
“incipit”
   of the letter.</p>
   <p>This one and the following ones should be indented.</p>
   <p>You may question whether “Dear list,” should be a paragraph of his 
own,
   but my text is already formatted like that and I can’t do anything
   about it.</p>
</text>
\stopbuffer

\startxmlsetups xml:somesetups
   \xmlsetsetup{#1}{text}{xml:text}
   \xmlsetsetup{#1}{p}{xml:p}
\stopxmlsetups

\xmlregistersetup{xml:somesetups}

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

\startxmlsetups xml:p
	\doifelse {\xmlatt {#1} {class}} {incipit}
	  {\noindentation \xmlflush {#1}\par \noindentation}
	  {\xmlflush {#1}\par \indentation}
\stopxmlsetups

\starttext
   \setupindenting [medium, yes]
   \xmlprocessbuffer{main}{test}{}
\stoptext

This will suppress indentation for paragraphs with class "incipit" and 
the following paragraph.

Thomas
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___________________________________________________________________________________

Re: use of preceding-sibling in xmlsetsetup

[mf]

Thank you for your answer, Thomas.
I tried something similar (putting a \noindentation at the end of the
"incipit" paragraph, but it failed if I put a \blank after that).

The sibling part
In the book of the history of luatex (v 0.50) it is said that the
sibling functions would not be implemented soon, but at least 3 methods
have been implemented. From the release notes 8/5/2010 (http://wiki.con
textgarden.net/Context_2010.05.08):
"implement following-sibling(), preceding-sibling() and reverse-
sibling() lpath methods"

If you search for "sibling" in the mailing list archive, you find a
pair of threads. I've found no other documentation.

"reverse-sibling" is ConTeXt specific and very useful: it's a "reversed
preceding-sibling", so that you find the nearest sibling at index [1].
I've used it successfully in a \doif statement, but I failed in
translating it in a \xmlsetsetup statement, to tell ConTeXt: "this
setup is for an element p whose nearest preceding sibling p has class
'incipit'".

Massi

Il giorno gio, 15/10/2015 alle 22.27 +0200, Thomas A. Schmitz ha
scritto:
> On 10/14/2015 01:34 PM, massifr@fastwebnet.it wrote:
> > I've found a better solution:
> > 
> > \startxmlsetups xml:p
> >    \doif{\xmlattribute{#1}{reverse-
> > sibling::p[1]}{class}}{incipit}{\noindent}%
> >    \xmlflush{#1}\par
> > \stopxmlsetups
> > 
> > Still I did not manage to put that rule in a xmlsetsetup.
> > Tried this:
> > 
> > \xmlsetsetup{#1}{p[reverse-sibling::p[1]/attribute('class') ==
> > 'incipit']}{xml:p:noindent}
> > 
> > but it does not work.
> 
> I'm not sure if the "sibling" part of xpath syntax has been
> integrated 
> into context. The best I can come up with is a hack which may help:
> 
> \startbuffer[test]
> <text>
>    <p class="incipit">Dear list,</p>
>    <p>this paragraph should not be indented, because it follows the 
> “incipit”
>    of the letter.</p>
>    <p>This one and the following ones should be indented.</p>
>    <p>You may question whether “Dear list,” should be a paragraph of
> his 
> own,
>    but my text is already formatted like that and I can’t do anything
>    about it.</p>
> </text>
> \stopbuffer
> 
> \startxmlsetups xml:somesetups
>    \xmlsetsetup{#1}{text}{xml:text}
>    \xmlsetsetup{#1}{p}{xml:p}
> \stopxmlsetups
> 
> \xmlregistersetup{xml:somesetups}
> 
> \startxmlsetups xml:text
>    \xmlflush{#1}
> \stopxmlsetups
> 
> \startxmlsetups xml:p
> 	\doifelse {\xmlatt {#1} {class}} {incipit}
> 	  {\noindentation \xmlflush {#1}\par \noindentation}
> 	  {\xmlflush {#1}\par \indentation}
> \stopxmlsetups
> 
> \starttext
>    \setupindenting [medium, yes]
>    \xmlprocessbuffer{main}{test}{}
> \stoptext
> 
> This will suppress indentation for paragraphs with class "incipit"
> and 
> the following paragraph.
> 
> Thomas
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___________________________________________________________________________________

Re: use of preceding-sibling in xmlsetsetup

[Thomas A. Schmitz]

On 10/17/2015 11:19 AM, mf wrote:
> "reverse-sibling" is ConTeXt specific and very useful: it's a "reversed
> preceding-sibling", so that you find the nearest sibling at index [1].
> I've used it successfully in a \doif statement, but I failed in
> translating it in a \xmlsetsetup statement, to tell ConTeXt: "this
> setup is for an element p whose nearest preceding sibling p has class
> 'incipit'".

In that case, why don't you show the code where you've used it 
successfully and maybe we can take it from there.

Thomas
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___________________________________________________________________________________

Re: use of preceding-sibling in xmlsetsetup

[Hans Hagen]

On 10/20/2015 11:48 AM, massifr@fastwebnet.it wrote:
> Here's the (complete) code:
>
> \startbuffer[test]
> <text>
>    <p class="incipit">Dear list,</p>
>    <p class="dopo-incipit">this paragraph should not be indented, because it follows the “incipit”
>    of the letter.</p>
>    <p>This one and the following ones should be indented.</p>
>    <p>You may question whether “Dear list,” should be a paragraph of his own,
>    but my text is already formatted like that and I can’t do anything
>    about it.</p>
> </text>
> \stopbuffer
>
> \startxmlsetups xml:somesetups
>    \xmlsetsetup{#1}{text}{xml:text}
>    \xmlsetsetup{#1}{p}{xml:p}
>    \xmlsetsetup{#1}{p[@class='incipit']}{xml:p:noindent}
>    % the following lpath expression does not work
>    % \xmlsetsetup{#1}{p[reverse-sibling::p[1]/attribute('class') == 'incipit']}{xml:p:noindent}
> \stopxmlsetups

\xmlsetsetup{#1}{p/reverse-sibling::p[1][@class=='incipit']/following-sibling::p[1]}{xml:p:noindent}

or

\xmlsetsetup{#1}{p/reverse-sibling::p[position()==1 and 
@class=='incipit']/following-sibling::p[1]}{xml:p:noindent}

> \xmlregistersetup{xml:somesetups}
>
> \startxmlsetups xml:text
>    \indenting[{yes,first,12pt}]
>    \xmlflush{#1}
> \stopxmlsetups
>
> \startxmlsetups xml:p
>    \doif{\xmlattribute{#1}{reverse-sibling::p[1]}{class}}{incipit}{\noindent}
>    \xmlflush{#1}\par
> \stopxmlsetups
>
> \startxmlsetups xml:p:noindent
>    \noindent\xmlflush{#1}\par
> \stopxmlsetups
>
> \starttext
>    \xmlprocessbuffer{main}{test}{}
> \stoptext
>
> It's the example of the original message of this thread, with the
> modifications posted in the second message.
>
> In the \startxmlsetups section I tried to put that condition in a
> \xmlsetsetup, but I commented it out because it did not work.
>
> Here's where I found an example with reverse-sibling:
> https://www.mail-archive.com/ntg-context%40ntg.nl/msg77364.html
> I was searching for "sibling" in the mailing list archive to see whether
> "sibling expressions" had been implemented.
>
> Greetings,
> Massi
>
>>> On 10/17/2015 11:19 AM, mf wrote:
>>>> "reverse-sibling" is ConTeXt specific and very useful: it's a "reversed
>>>> preceding-sibling", so that you find the nearest sibling at index [1].
>>>> I've used it successfully in a \doif statement, but I failed in
>>>> translating it in a \xmlsetsetup statement, to tell ConTeXt: "this
>>>> setup is for an element p whose nearest preceding sibling p has class
>>>> 'incipit'".
>>>
>>> In that case, why don't you show the code where you've used it
>>> successfully and maybe we can take it from there.
>>>
>>> Thomas
>>>
>
> ___________________________________________________________________________________
> 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://tex.aanhet.net
> archive  : http://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________
>


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___________________________________________________________________________________

Re: use of preceding-sibling in xmlsetsetup

[massifr]

Here's the (complete) code:

\startbuffer[test]
<text>
  <p class="incipit">Dear list,</p>
  <p class="dopo-incipit">this paragraph should not be indented, because it follows the “incipit”
  of the letter.</p>
  <p>This one and the following ones should be indented.</p>
  <p>You may question whether “Dear list,” should be a paragraph of his own,
  but my text is already formatted like that and I can’t do anything 
  about it.</p>
</text>
\stopbuffer
 
\startxmlsetups xml:somesetups
  \xmlsetsetup{#1}{text}{xml:text}
  \xmlsetsetup{#1}{p}{xml:p}
  \xmlsetsetup{#1}{p[@class='incipit']}{xml:p:noindent}
  % the following lpath expression does not work
  % \xmlsetsetup{#1}{p[reverse-sibling::p[1]/attribute('class') == 'incipit']}{xml:p:noindent}
\stopxmlsetups

\xmlregistersetup{xml:somesetups}

\startxmlsetups xml:text
  \indenting[{yes,first,12pt}]
  \xmlflush{#1}
\stopxmlsetups

\startxmlsetups xml:p
  \doif{\xmlattribute{#1}{reverse-sibling::p[1]}{class}}{incipit}{\noindent}
  \xmlflush{#1}\par
\stopxmlsetups
 
\startxmlsetups xml:p:noindent
  \noindent\xmlflush{#1}\par
\stopxmlsetups

\starttext
  \xmlprocessbuffer{main}{test}{}
\stoptext
 
It's the example of the original message of this thread, with the 
modifications posted in the second message.

In the \startxmlsetups section I tried to put that condition in a
\xmlsetsetup, but I commented it out because it did not work.
 
Here's where I found an example with reverse-sibling:
https://www.mail-archive.com/ntg-context%40ntg.nl/msg77364.html
I was searching for "sibling" in the mailing list archive to see whether
"sibling expressions" had been implemented.

Greetings,
Massi

> > On 10/17/2015 11:19 AM, mf wrote:
> > > "reverse-sibling" is ConTeXt specific and very useful: it's a "reversed
> > > preceding-sibling", so that you find the nearest sibling at index [1].
> > > I've used it successfully in a \doif statement, but I failed in
> > > translating it in a \xmlsetsetup statement, to tell ConTeXt: "this
> > > setup is for an element p whose nearest preceding sibling p has class
> > > 'incipit'".
> > 
> > In that case, why don't you show the code where you've used it 
> > successfully and maybe we can take it from there.
> > 
> > Thomas
> > 

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