Re: unpacking percent-escaped URI components

Im surprised that there is not the inverse of encode-for-uri() but I do not
find anything the XPath 3.1 functions and operators.

Cheers,

E.
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From: Graydon graydon@xxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Monday, November 7, 2022 at 4:00 PM
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx <xsl-list@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re:  unpacking percent-escaped URI components
[External Email]

On Mon, Nov 07, 2022 at 09:36:47PM -0000, Martin Honnen martin.honnen@xxxxxx
scripsit:
> On 11/7/2022 10:29 PM, Martin Honnen martin.honnen@xxxxxx wrote:
> > On 11/7/2022 9:55 PM, Graydon graydon@xxxxxxxxx wrote:
> > > Unpacking RFC 4122 percent-escaped strings for code points less than
> > > 256 is straightforward --
> > >
> > > tokenize($value,'%')[normalize-space()] ! local:H2D(.) !
> > > codepoints-to-string(.)
> > >
> > > where local:H2D is a hex-digits-to-decimal-integer function.
> > >
> > > When the escaped value goes above 255, as with U+201C and U+201D, ,
> > > the escapes start being multi-octet UTF-8, so %E2%80%9C and %E2%80%9D.
> > >
> > > Is there a useful way to turn those multi-octet escapes back into
single
> > > characters in XPath or XSLT?
> > >
> > I wonder whether with Saxon PE or EE you can use e.g.
> >
> > (tokenize($value,'%')[normalize-space()] ! local:H2D(.)) =>
> > saxon:octets-to-hexBinary() => saxon:hexBinary-to-string('UTF8')
> >
> Yes, now tested e.g.
>
>   (226, 128,  156, 226, 128,  157) => saxon:octets-to-hexBinary() =>
> saxon:hexBinary-to-string('UTF8')
>
> gives 

I am impressed!

(And only feeling a little bit like a cabbage.)

Thank you!

--
Graydon Saunders | graydonish@xxxxxxxxx
^fs oferiode, pisses swa mfg.
-- Deor ("That passed, so may this.")