Re: [xsl] Navigating <xsl:for-each-group> groups

Subject: Re: [xsl] Navigating <xsl:for-each-group> groups
From: "Wendell Piez wapiez@xxxxxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 16 Nov 2015 23:14:43 -0000

Or (the same again)

preceding-sibling::*[current-group() intersect .]

or more explicitly

preceding-sibling::*[exists(current-group() intersect .]

These are getting at the set backwards, and will depend on things
being kept in relative (document) order. While this is a neat trick,
the check against position() inside for-each select="current-group()"
is more robust since it will work whatever group you have, however
composed in whatever order given.

<xsl:for-each-group ...>

<xsl:variable name="this-group" select="current-group()"/>
  <xsl:apply-templates select="$this-group" mode="group-member">
    <xsl:with-param name="group" select="$this-group"/>

Then the receiving template in mode "group-member" knows to compare
position() inside $group for relative position within the group.

(And this will work as long as you apply templates to all of them at once.)

Kind of a fun problem.

Cheers, Wendell

On Mon, Nov 16, 2015 at 5:25 AM, Martin Honnen martin.honnen@xxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> Michael MC<ller-Hillebrand mmh@xxxxxxxxx wrote:
>>> Am 13.11.2015 um 15:54 schrieb Rick Quatro rick@xxxxxxxxxxxxxx
>>> <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>:
>>> As I am processing a for-each-group, I want to check some of the elements
>>> within the group that are before or after the current node. I can use
>>> preceding-sibling and following-sibling axes, but it doesn't seem like
>>> these
>>> are restricted to the current-group. Is there a good way to query what is
>>> before or after the current node of a group, while insuring that the
>>> query
>>> stays within the group? Thanks. -Rick
>> I would understand your requirement in a way that might be solved by using
>> something like this:
>> preceding-sibling::*[. = current-group()]
>> following-sibling::*[. = current-group()]
>> I.e. limit the result of your lookup along the preceding-sibling and
>> following-sibling axes to the current group.
> But he did a
>   <xsl:for-each-group select="*" group-starting-with="one">
> If he had
>   <xsl:for-each-group select="*" group-by=".">
> then your comparison would make sense.
> Or did you want to use the `is` operator e.g.
>   preceding-sibling::*[some $item in current-group() satisfies . is $item]
> ?

Wendell Piez |
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