Re: [xsl] XSLT 4: xsl:template/@select

["BR Chrisman brchrisman@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

ohhh xsl:mode enclosing templates.. I use that a lot in generated
stylesheets... it just makes so much sense.... looking forward to
that!

On Mon, May 18, 2020 at 11:52 AM Graydon graydon@xxxxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> On Mon, May 18, 2020 at 05:04:12PM -0000, Michael Kay mike@xxxxxxxxxxxx
scripsit:
> > I didn't want to create messy scoping rules for variables, e.g.
> >
> > <xsl:template match="type(xs:integer)" mode="increment" select=".+1"/>
> >
> > is fine, but
> >
> > <xsl:template match="type(xs:integer)" mode="increment"
select=".+$delta">
> >   <xsl:param name="delta" as="xs:integer"/>
> > </xsl:template>
> >
> > feels a bit weird.
>
> I can't speak to feel at all, and I have no knowledge of how difficult
> it makes the scoping rules to implement, but that second example is to
> me obviously ever so much more useful.  It implies one could do things
> like perform a simple numbering pass and then have one template that
> went through and attached all the appropriate names -- part, chapter,
> section, etc. -- on a second pass by matching the numbers, with the text
> provided by parameter.
>
> > We had similar issues with xsl:iterate - the reason xsl:on-completion
comes first is to avoid creating custom rules for variable scoping.
> >
> > Using params in match patterns gets even more interesting - useful, but
hairy:
> >
> > <xsl:template match="para[@class=$class]">
> >   <xsl:param name="class"/>
> >   ...
> > </xsl:template>
>
> I cannot tell you how many times I have wanted to be able to do that.
>
> There's -- I think there is -- an appropriate caution with template
> predicates so that you have templates to match every possible, rather
> than every expected, case.  Being able to stuff all of that logic into
> whatever singular thing assigns the value to $class, rather than
> distributing it over a bunch of templates' individual predicates, would
> be extremely helpful.
>
> (And yes it starts to be a special case of XPath macros, but I would
> like those, too.)
>
> --
> Graydon Saunders  | graydonish@xxxxxxxxx
> CC&s oferC)ode, C0isses swC! mC&g.
> -- Deor  ("That passed, so may this.")