Grouping should liberate you from looking ahead or behind. So instead of
matching the first <ph outputclass="x">, you'd match <p> (or more
generally '*[ph[@outputclass]]') and do the group-adjacent grouping for
the child nodes, like this:
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="3.0">
<xsl:template match="*[ph[@outputclass]]">
<xsl:copy>
<xsl:apply-templates select="@*" mode="#current"/>
<xsl:for-each-group select="node()"
group-adjacent="string(self::ph/@outputclass)">
<xsl:choose>
<xsl:when test="current-grouping-key()">
<xsl:element name="{current-grouping-key()}">
<xsl:value-of select="current-group()"
separator=""/>
</xsl:element>
</xsl:when>
<xsl:otherwise>
<xsl:apply-templates select="current-group()"
mode="#current"/>
</xsl:otherwise>
</xsl:choose>
</xsl:for-each-group>
</xsl:copy>
</xsl:template>
<xsl:mode on-no-match="shallow-copy"/>
</xsl:stylesheet>
This is not shorter in terms of lines of code than what you suggested.
In terms of performance, it could be a bit more efficient than your
solution, depending on the cost of identifying the first
ph[@output-class] and its following siblings, compared to the cost of
identifying a parent of ph[@output-class] and selecting its children.
But as I wanted to say above, in terms of idiomatic XSLT 2+ purity, I'd
always prefer a solution that doesn't look along the preceding/following
axes, even when it is done just once for selecting the for-each-group
population.
Gerrit
On 05.02.2020 23:29, Eliot Kimber ekimber(_at_)contrext(_dot_)com wrote:
In my XML I can have adjacent elements that should be processed as a unit,
where the adjacent elements all have the same value for a given attribute.
Other elements with the same attribute could be following siblings but
separated by other elements or text nodes, i.e.:
<p>Text <ph outputclass="x">1</ph><ph outputclass="x">2</ph> more text <ph
outputclass="x">New sequence</ph></p>
Where the rendered result should combine the first two <ph> elements but not
the third, i.e.:
<p>Text <x>12</x> more text <x>New sequence</x></p>
Processing is applied to the first element in the document with the @outputclass value
"x" and then I want to grab any immediately following siblings with the same
@outputclass value and no intervening text or element nodes.
My solution is to use for-each-group like so:
<xsl:variable name="this" as="element()" select="."/>
<xsl:variable name="adjacent-sibs" as="element()+">
<xsl:for-each-group select="($this, $this/following-sibling::node())"
group-adjacent="string(@outputclass)">
<xsl:if test=". is $this">
<xsl:sequence select="current-group()"/>
</xsl:if>
</xsl:for-each-group>
</xsl:variable>
Which works, but I'm thinking there must be a more compact way to do the same
selection, but the formulation is escaping me.
Is there a more compact or more efficient way to make this selection of only
immediately-adjacent following siblings?
Thanks,
E.
--
Eliot Kimber
http://contrext.com
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