Subject: Re: [xsl] XSLT 2.0 courses?|
From: "Imsieke, Gerrit, le-tex gerrit.imsieke@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 21 Sep 2020 10:20:47 -0000
I've been proposing ($a otherwise $b) to meet this requirement: it returns $a unless it's an empty sequence, in which case it returns $b.
For example @price - (@discount otherwise 0)
It's actually implemented in Saxon 10 if you switch syntax extensions on.
Michael Kay Saxonica
On 21 Sep 2020, at 02:34, Pieter Lamers pieter.lamers@xxxxxxxxxxxx <mailto:pieter.lamers@xxxxxxxxxxxx> <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx <mailto:xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>> wrote:
An avid user of ($a, $b) myself, which winks at TransactSQL ISNULL($a, $b) and MySQL IFNULL($a, $b), I do have to remind myself that $a has to be a single item for the /if/else /shortcut to work.
let $a := ('one','two','three') let $b := ('none')
return ($a, $b) will return just the first item in the sequence, 'one', and not 'one','two','three', which might be what you want to achieve in this quasi shorthanded /if/else /construction.
Not that you wouldn't know, Liam, just as a heads up to some others in this audience who might not.
On 19/09/2020 01:54, Liam R. E. Quin liam@xxxxxxxxxxxxxxxx wrote:On Fri, 2020-09-18 at 19:31 +0000, Wendell Piezwapiez@xxxxxxxxxxxxxxx wrote:Hi,
In addition to Liam's list I think there are a couple more vital features one needs to get a taste of in XSLT 2.0 or XSLT 3.0, if one has been subsisting on an XSLT 1.0 diet:
* <xsl:for-each-group> and its uses * temporary trees - * regex support in functions and xsl:analyze-string * tunnel parameters?Yeah, those are all huge, although i think easier to learn than things like ($a, 'none'), which are startling because XSLT 1 didn't have sequences.
For those wondering, ($a, $b, $c, ...) returns the first non-empty non-false item out of $a, $b and $c, so it's a shortcut for <xsl:sequence select="if ($a) then $a else $b" />
On regular expressions - it's huge, but it's also dangerous, as e.g. replace(price div 100, '\.\d*$', '') is not a good way to write math:floor().
An XSLT-3-from-scratch course could easily take a full week and be woefully incomplete. Or totally overwhelming. Or both.
On the other hand, i try & include "don't be afraid of the specs" in the courses i teach, and then not cover every detail. So maybe it's possible.
|<- Previous||Index||Next ->|
|Re: [xsl] XSLT 2.0 courses?, Norm Tovey-Walsh ndw||Thread||Re: [xsl] XSLT 2.0 courses?, Michael Kay mike@xxx|
|Re: [xsl] XSLT 2.0 courses?, Norm Tovey-Walsh ndw||Date||Re: [xsl] XSLT 2.0 courses?, Michael Kay mike@xxx|