[NTG-context] Dynamic document variables from metadata

Thangalin thangalin at gmail.com
Sun Jan 2 20:15:08 CET 2022


Thank you, Hans.

Updates are in place:

https://github.com/DaveJarvis/keenwrite/releases
https://github.com/DaveJarvis/keenwrite-themes/releases

On Sun, Jan 2, 2022 at 3:11 AM Hans Hagen <j.hagen at xs4all.nl> wrote:

> On 1/2/2022 2:54 AM, Thangalin via ntg-context wrote:
> > Happy New Year!
> >
> > How would you implement a mechanism that takes arbitrary XHTML <meta>
> > tags and produces document variables? Consider:
> >
> >      <meta name="journal" content="Nature" />
> >
> > After running XML setups, the following would write "Nature":
> >
> >      \documentvariable{journal}
> >
> > The tricky part is doing this without pre-defining them. Here's a short,
> > self-contained example to help demonstrate:
> >
> > |\startbuffer[xdoc] <html> <head> <meta content="Milena Marić Einstein"
> > name="author"/> <meta content="Annalen der Physik" name="journal"/>
> > </head> <body> </body> </html> \stopbuffer \startxmlsetups xml:xhtml
> > \xmlsetsetup{\xmldocument}{*}{-}
> > \xmlsetsetup{\xmldocument}{html|body}{xml:*}
> > \xmlsetsetup{\xmldocument}{head}{xml:meta} \stopxmlsetups
> > \xmlregistersetup{xml:xhtml} \startxmlsetups xml:html
> > % "author" is a special setup, not generalized
> > \xmlfilter{#1}{/head/meta[@name='author']/command(xml:author)} % What
> > goes here to make this dynamic?
> > %\xmlfilter{#1}{/head/meta[@name='journal']/command(xml:journal)}
> > \xmlflush{#1} \stopxmlsetups \startxmlsetups xml:author
> > \setupdocument[author={\xmlatt{#1}{content}}]
> > \setupdocument[metadata:author={\xmlatt{#1}{content}}]
> > \setupinteraction[author={\documentvariable{author}}] \stopxmlsetups %
> > How can this be generalized? %\startxmlsetups xml:journal
> > %\setupdocument[journal={\xmlatt{#1}{content}}] %\stopxmlsetups
> > \startxmlsetups xml:body \startdocument Author:
> > \documentvariable{author} \par Journal: \documentvariable{journal}
> > \stopdocument \stopxmlsetups \xmlprocessbuffer{main}{xdoc}{}|
> \startxmlsetups xml:setdocumentvariable
>    \setupdocument[\xmlatt{#1}{name}={\xmlatt{#1}{content}}]
> \stopxmlsetups
>
> \startxmlsetups xml:author
>    \setupdocument[author={\xmlatt{#1}{content}}]
>    \setupdocument[metadata:author={\xmlatt{#1}{content}}]
>    \setupinteraction[author={\documentvariable{author}}]
> \stopxmlsetups
>
> \startxmlsetups xml:html
>    \xmlfilter{#1}{/head/meta/command(xml:setdocumentvariable)}
>    \xmlfilter{#1}{/head/meta[@name='author']/command(xml:author)}
>    \startdocument
>    \xmlflush{#1}
>    \stopdocument
> \stopxmlsetups
>
>
>
> -----------------------------------------------------------------
>                                            Hans Hagen | PRAGMA ADE
>                Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>         tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
> -----------------------------------------------------------------
>
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