On 21 Apr 2021, at 20:17, Jano Kula <jano.kula@gmail.com>= wrote:

Dear list,

first episode of series on nbsp of XML in lmtx.
Unfortunately, not that catchy as Netflix.

Used= XML input has two types of non-breakable space:
unicode = character
html entitity = (in fact an ugly output of HTML editor)
HTML is = preprocessed with ctx preprocessor (great feature!) and substituted for = unicode char nbsp or tilde.

MWE shows unichar spaces are = non-breakable (see end of the first lines), however they are not = stretchable (see second line of the paragraphs).

Does unicode nbsp have fixed with in = ctx?

When = tilde is the replacement in preprocessor (uncomment first replacement in = preprocessor), xmlfush will display tilde (which is, as character, = non-breakable and unstretchable, no surprise).

Why tilde is displayed?

Replacing or adding nbsp = (tilde) with finalizers have different results, see next episode after = this one is understood.

Thank you,
Jano

MWE (rather use attached file not to = loose invisible characters):

\startbuffer[doc]
<?xml version = "1.0"?>
<document>
= <p>Temperature 20 =C2=B0C 20 =C2=B0C = 20 =C2=B0C 20 =C2=B0C average.</p>
= <p>Altitude 6000&nbsp;m = 6000&nbsp;m 6000&nbsp;m 6000&nbsp;m = average.</p>
</document>
\stopbuffer

\startluacode
function lxml.preprocessor(data)
= -- data =3D string.gsub(data, "&nbsp;", "~")
= -- replacement nbsp invisible in luacode
= data =3D string.gsub(data, "&nbsp;", " ")
return data
end
\stopluacode

\startxmlsetups xml:name
= \xmlsetsetup{\xmldocument}{*}{-}
= \xmlsetsetup{\xmldocument}{document|p}{xml:name:*}
\stopxmlsetups
\xmlregistersetup{xml:name}

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

\startxmlsetups xml:name:p
\parfillskip0pt\xmlflush{#1}\par
\stopxmlsetups

\startTEXpage[offset=3D5mm,width=3D60mm]
\xmlprocessbuffer{xml:name}{doc}{}
\stopTEXpage
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