> Why tilde is displayed?

Wouldn't the simple answer not be: because XML is not TeX?

dr. Hans van der Meer


> 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 °C 20 °C 20 °C 20 °C average.</p>
>         <p>Altitude 6000&amp;nbsp;m 6000&amp;nbsp;m 6000&amp;nbsp;m 6000&amp;nbsp;m average.</p>
> </document>
> \stopbuffer
> 
> \startluacode
> function lxml.preprocessor(data)
>     -- data = string.gsub(data, "&amp;nbsp;", "~")
>     -- replacement nbsp invisible in luacode
>     data = string.gsub(data, "&amp;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=5mm,width=60mm]
> \xmlprocessbuffer{xml:name}{doc}{}
> \stopTEXpage
> <xml-and-space-preprocessor.tex>___________________________________________________________________________________
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