[NTG-context] Access current element in xmlsetsetup via xml.expressions

[achim at jander.de]

Hello,

I'm trying to build an xmlsetsetup with an own lua function. XML in MKIV
says on pg. 33:

You can also use normal Lua functions as long as you make sure that you pass
the right arguments.

There are a few predefined variables available inside such functions.

list table the list of matches

l number the current index in the list of matches

ll element the current element that matched

order number the position of the root of the path

 

But I can't figure out how to get access to list, ll etc.

My MWE (only for testing the access, is always true):

 

\startbuffer[text]

<para>Dies ist <inline style="sup">ein</inline> xxx<inline
style="sub">zwei</inline> noch ein <inline style="sup">sup</inline>
Test<inline style="sub">sub</inline></para>

\stopbuffer

%\enabletrackers[xml.parse,xml.path]

 

\startluacode

  function xml.expressions.nextnodeatt(e)

                inspect(e)

                inspect(ll)

                return('sub')

  end

\stopluacode

 

\startxmlsetups xml:textsetups

    \xmlsetsetup{#1}{*}{+}

    \xmlsetsetup{#1}{para}{xml:*}

 
\xmlsetsetup{#1}{inline[@style='sup'][xml.expressions.nextnodeatt(ll)=='sub'
]}{xml:sub}

\stopxmlsetups

 

\xmlregistersetup{xml:textsetups}

 

\startxmlsetups xml:para

    \xmlflush{#1}\par

\stopxmlsetups

 

\startxmlsetups xml:sub

    \color[red]{\xmlflush{#1}}

\stopxmlsetups

 

 

\starttext

    \xmlprocessbuffer{main}{text}{}

\stoptext

 

Thanks in advance,

Achim

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