Re: [NTG-context] Xml filtering in Lua

16 Nov 2022


      Just a quick question regarding this?
Is xml.filter equivalent to \xmlfilter? If so, how do you pass the match to a command as you'd do with \xmlfilter?

Best,
Denis
...
-----Ursprüngliche Nachricht-----
Von: ntg-context  Im Auftrag von mf via ntg-
context
Gesendet: Mittwoch, 16. November 2022 20:56
An: ntg-context@ntg.nl
Cc: mf 
Betreff: Re: [NTG-context] Xml filtering in Lua
This works:
local metadata = xml.filter (t, '../../topics/topic[@t:id=="' .. ch_id .. '"]')
also this:
local lpath = string.format('../../topics/topic[@t:id=="%s"]', ch_id)
local metadata = xml.filter (t, lpath)
It looks like xml.filter supports only 2 arguments (see lxml-tex.lua), and so it
doesn't let you use string formatting patterns like the "context" command
does.
You can write:
context('the value of @t:id is "%s"', ch_id)
but you can't write:
xml.filter (t, '../../topics/topic[@t:id=="%s"]', ch_id)
Best wishes,
Massi
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-----Ursprüngliche Nachricht-----
Von: ntg-context  Im Auftrag von Thomas A.
Schmitz via ntg-context
Gesendet: Mittwoch, 16. November 2022 20:56
An: mailing list for ConTeXt users 
Cc: Thomas A. Schmitz 
Betreff: Re: [NTG-context] Xml filtering in Lua
On 11/16/22 19:56, mf via ntg-context wrote:
...
local ch_id = t.at["ch:id"]
You're right, of course, using a colon was a stupid idea. When I replace it with
an underscore, you can see that both are in fact identical:
\startbuffer[test]
<document>
   <topics>
      <topic t_id="test1">
  <title>This is the first test</title>
  <date>22/11/16</date>
      </topic>
      <topic t_id="test2">
  <title>This is the second test</title>
  <date>22/11/17</date>
      </topic>
   </topics>
   <chapters>
      <chapter ch_id="test1">
  <content>
    This will be the content of the <emph>first</emph> chapter.
  </content>
      </chapter>
      <chapter ch_id="test2">
   <content>
    This will be the content of the <emph>second</emph> chapter.
   </content>
      </chapter>
   </chapters>
</document>
\stopbuffer
\startxmlsetups xml:testsetups
        \xmlsetsetup{#1}{*}{-}
  \xmlsetsetup{#1}{document|chapters|chapter|content|emph}{xml:
*}
\stopxmlsetups
\xmlregistersetup{xml:testsetups}
\startxmlsetups xml:document
  \xmlflush{#1}
\stopxmlsetups
\startxmlsetups xml:chapters
  \xmlflush{#1}
\stopxmlsetups
\startxmlsetups xml:chapter
  \xmlfunction {#1} {chapter}
%	 \xmlflush {#1}
\stopxmlsetups
\startxmlsetups xml:chapter:content
  \xmltext {#1} {content}
\stopxmlsetups
\startxmlsetups xml:emph
   {\em \xmlflush {#1}}
\stopxmlsetups
\startluacode
function xml.functions.chapter (t)
   local chapter_id = t.at.ch_id
   local other_chapter_id = t.at["ch_id"]
   context (chapter_id)
   context.par ()
   context (other_chapter_id)
   context.par ()
      local metadata = xml.filter (t, '../../topics/topic[@t:id=="%s"]',
ch_id)
      print (inspect(metadata))
      lxml.command(t, ".", "xml:chapter:content")
      context.par ()
end
\stopluacode
\starttext
  \xmlprocessbuffer{main}{test}{}
\stoptext
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Re: [NTG-context] Xml filtering in Lua

denis.maier＠unibe.ch