content of xml node (element) in lua

[Jano Kula <jano.kula@gmail.com>]

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Hello!

Processing XML I want to manipulate content of XML elements inside Lua.

I can define the Lua function xml.functions.name(t), where processing
happens, and use the command \xmlfunction{#1}{name} to pass the current
node #1 from ctx to lua as described in the xml-mkiv.pdf manual. To access
the element content xml.text(t,"/element") Lua function is used.

However, using the same function xml.text("#1",/element) directly inside
Lua doesn't work for me. Node #1 is available, but not the content of
/element.

\startluacode
    local node = "#1"
    local content = xml.text("#1","/color")
    context.par() context("node: ") context(node)
    context.par() context("lua: ")  context(content)
\stopluacode

MWE (mkiv, beta) attached.

I haven't found an example, so is it even possible? If so, which way is
more efficient?

Thanks,
Jano

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\startbuffer[doc]
<?xml version "1.0"?>
<document>
    <section title="First">
        <color>red</color>
        text1
    </section>
    <section title="Second">
        <color>blue</color>
        text2
    </section>
</document>
\stopbuffer

\startluacode
function xml.functions.name(t)
    local content = xml.text(t,"/color")
    context.par() context("function: ") context(content)
end

\stopluacode

\startxmlsetups xml:name
    \xmlsetsetup{\xmldocument}{*}{-}
    \xmlsetsetup{\xmldocument}{document|section}{xml:name:*}
\stopxmlsetups

\xmlregistersetup{xml:name}

\startxmlsetups xml:name:document
    \xmlflush{#1}
\stopxmlsetups

\startxmlsetups xml:name:section
    \startsection[title=\xmlatt{#1}{title}]
    % ctx function
    \xmlfunction{#1}{name}
    % lua only
    \startluacode
        local node = "#1"
        local content = xml.text("#1","/color")
        context.par() context("node: ") context(node)
        context.par() context("lua: ")  context(content)
    \stopluacode
    \stopsection
\stopxmlsetups

\starttext

\xmlprocessbuffer{xml:name}{doc}{}

\stoptext

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