What exactly is lpath?

What exactly is lpath?

[Denis Maier via ntg-context]

Hi everyone
Just a question I've been thinking about from time to time: What exactly is lpath? Is that ConTeXt-specific? Or something more general from Lua? I've of course asked Google, but Lpath seems to a Python-inspired path library for Lua unrelated to XML...
Best,
Denis


> -----Ursprüngliche Nachricht-----
> Von: ntg-context <ntg-context-bounces@ntg.nl> Im Auftrag von Taco
> Hoekwater via ntg-context
> Gesendet: Mittwoch, 3. August 2022 09:09
> An: mailing list for ConTeXt users <ntg-context@ntg.nl>
> Cc: Taco Hoekwater <taco@bittext.nl>; Pablo Rodriguez <oinos@gmx.es>
> Betreff: Re: [NTG-context] issue with lpath
> 
> 
> 
> > On 2 Aug 2022, at 21:14, Pablo Rodriguez via ntg-context <ntg-
> context@ntg.nl> wrote:
> >
> > Dear list,
> >
> >
> > I need an lpath to select the h3 node above, but only the one with "h3
> > + blockquote" as a CSS selector (which could be added the lpath "../h3"
> > after).
> 
> Lpath supports CSS selectors between curly braces as parts, so simply:
> 
>   \xmlsetsetup{#1}{{h3 + blockquote}/../h3} {xml:section}
> 
> should do. The xml-mkiv.pdf manual has lots of other lpath examples as well.
> 
> Best wishes,
> Taco
> 
> —
> Taco Hoekwater              E: taco@bittext.nl
> genderfluid (all pronouns)
> 
> 
> 
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Re: What exactly is lpath?

[Hans Hagen via ntg-context]

On 8/3/2022 9:46 AM, Denis Maier via ntg-context wrote:
> Hi everyone
> Just a question I've been thinking about from time to time: What exactly is lpath? Is that ConTeXt-specific? Or something more general from Lua? I've of course asked Google, but Lpath seems to a Python-inspired path library for Lua unrelated to XML...
it's a bit like xpath ... a way to access arbitrary nodes in a xml tree 
with lokup and access 'patterns'

Hans

-----------------------------------------------------------------
                                           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 / https://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________

Re: What exactly is lpath?

[Denis Maier via ntg-context]

> -----Ursprüngliche Nachricht-----
> Von: ntg-context <ntg-context-bounces@ntg.nl> Im Auftrag von Hans Hagen
> via ntg-context
> Gesendet: Mittwoch, 3. August 2022 10:35
> An: Denis Maier via ntg-context <ntg-context@ntg.nl>
> Cc: Hans Hagen <j.hagen@xs4all.nl>
> Betreff: Re: [NTG-context] What exactly is lpath?
> 
> On 8/3/2022 9:46 AM, Denis Maier via ntg-context wrote:
> > Hi everyone
> > Just a question I've been thinking about from time to time: What exactly is
> lpath? Is that ConTeXt-specific? Or something more general from Lua? I've of
> course asked Google, but Lpath seems to a Python-inspired path library for
> Lua unrelated to XML...
> it's a bit like xpath ... a way to access arbitrary nodes in a xml tree with lokup
> and access 'patterns'

Thanks. That I do know. I was more wondering where that is coming. (My question was probably not that clear.) 
As I couldn't find more about it I guess it's ConTeXt-specific, not something coming from the Lua ecosystem...
Just like Pablo, I'm from time to time reading through the xml-mkiv manual, and I was just wondering if there other places where I can other examples or explanations. (If it were a more general Lua thing for example...)

Denis
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___________________________________________________________________________________

Re: What exactly is lpath?

[Hans Hagen via ntg-context]

On 8/3/2022 4:39 PM, Denis Maier via ntg-context wrote:
>> -----Ursprüngliche Nachricht-----
>> Von: ntg-context <ntg-context-bounces@ntg.nl> Im Auftrag von Hans Hagen
>> via ntg-context
>> Gesendet: Mittwoch, 3. August 2022 10:35
>> An: Denis Maier via ntg-context <ntg-context@ntg.nl>
>> Cc: Hans Hagen <j.hagen@xs4all.nl>
>> Betreff: Re: [NTG-context] What exactly is lpath?
>>
>> On 8/3/2022 9:46 AM, Denis Maier via ntg-context wrote:
>>> Hi everyone
>>> Just a question I've been thinking about from time to time: What exactly is
>> lpath? Is that ConTeXt-specific? Or something more general from Lua? I've of
>> course asked Google, but Lpath seems to a Python-inspired path library for
>> Lua unrelated to XML...
>> it's a bit like xpath ... a way to access arbitrary nodes in a xml tree with lokup
>> and access 'patterns'
> 
> Thanks. That I do know. I was more wondering where that is coming. (My question was probably not that clear.)
> As I couldn't find more about it I guess it's ConTeXt-specific, not something coming from the Lua ecosystem...

indeed, all lua code is written in the context perspective; we used some 
socket code but that was also stripped and parially redone (seemed not 
maintained at that time)

keep in mind that we started with luate xin 2005 so much of the lua code 
had to be written anyway and it also had to be pretty efficient and 
useable in tex; roberto had an example of a simple xml parser and for 
xml i started from that but by now it's quite different and way more 
extensive; we need to be able to handle huge files

so, no dependencies and we keep it that way

> Just like Pablo, I'm from time to time reading through the xml-mkiv manual, and I was just wondering if there other places where I can other examples or explanations. (If it were a more general Lua thing for example...)

the test suite and x-* files ...

Hans


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

Re: What exactly is lpath?

[Pablo Rodriguez via ntg-context]

On 8/3/22 16:39, Denis Maier via ntg-context wrote:
> [...]
> Just like Pablo, I'm from time to time reading through the xml-mkiv
> manual, and I was just wondering if there other places where I can
> other examples or explanations. (If it were a more general Lua thing
> for example...)

Hi Dennis,

my impression is that (at least in my case) the hardest part is to
figure out how XPath actually works.

For that, I wonder whether
https://github.com/sarahalang/Harvard_BeyondTEI_Workshop_SLang2022 may
be helpful.

This is from the LaTeX-Ninja (Sarah A. Lang). But nothing prevents using
it as an exercise for ConTeXt users. I haven’t done it myself.

Just in case it might help,

Pablo
___________________________________________________________________________________
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maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________