Dear Experts,
I've been aggregating numbers in XSLT 1.0 using the preceding-sibling:: axis
for nodes with the same parent. I now need to aggregate all the values that
precede the context node, even if they have different parents. For this I
added another attribute using the preceding:: axis (see XSLT 1.0 Stylesheet
below). Unfortunately, the transform is starting to groan under the weight
of all these O(n^2) operations. I have revisited an earlier solution
suggested by Dimitre Novatchev (see XSLT 2.0 Stylesheet below) that uses
FXSL. However, I'm not clear how I can adapt it to meet the new
requirements. Specifically, I would like to:
a) generate attribute y3 that is a cumulative value based on all preceding
<point> elements
b) copy y1 from the input to the output
Sincerely, Simon
---------------------------------------------
XSLT 2.0 Stylesheet
---------------------------------------------
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:f="http://fxsl.sf.net/"
exclude-result-prefixes="f">
<xsl:import href="fxsl-xslt2/f/func-scanlDVC.xsl"/>
<xsl:import href="fxsl-xslt2/f/func-Operators.xsl"/>
<xsl:template match="node()|@*">
<xsl:copy>
<xsl:apply-templates select="node()|@*"/>
</xsl:copy>
</xsl:template>
<xsl:template match="set">
<xsl:copy>
<xsl:copy-of select="@*"/>
<xsl:for-each-group select="point" group-by="@x">
<xsl:sort select="current-grouping-key()" data-type="number"/>
<xsl:for-each select="f:scanl1(f:add(), current-group()/@y1)">
<point x="{current-group()[1]/@x}" y2="{.}"/>
</xsl:for-each>
</xsl:for-each-group>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
---------------------------------------------
XSLT 1.0 Stylesheet
---------------------------------------------
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="node()|@*">
<xsl:copy>
<xsl:apply-templates select="node()|@*"/>
</xsl:copy>
</xsl:template>
<xsl:template match="point">
<xsl:copy>
<xsl:copy-of select="@*"/>
<xsl:attribute name="y2">
<xsl:value-of select="sum(./@y1|preceding-sibling::point[(_at_)x =
current()/@x]/@y1)"/>
</xsl:attribute>
<xsl:attribute name="y3">
<xsl:value-of select="sum(./@y1|preceding::point[(_at_)x =
current()/@x]/@y1)"/>
</xsl:attribute>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
---------------------------------------------
Input
---------------------------------------------
<root id="theroot">
<set id="1">
<point x="1" y1="2" />
<point x="1" y1="3" />
<point x="1" y1="0" />
<point x="1" y1="2" />
<point x="1" y1="2" />
<point x="2" y1="3" />
<point x="2" y1="0" />
<point x="2" y1="2" />
<point x="3" y1="2" />
<point x="3" y1="3" />
<point x="3" y1="1" />
<point x="3" y1="2" />
<point x="3" y1="2" />
</set>
<set id="2">
<point x="1" y1="2" />
<point x="1" y1="3" />
<point x="1" y1="0" />
<point x="1" y1="2" />
<point x="2" y1="2" />
<point x="3" y1="2" />
<point x="3" y1="2" />
<point x="3" y1="2" />
</set>
<set id="n">
<point x="1" y1="2" />
<point x="1" y1="3" />
<point x="1" y1="2" />
<point x="2" y1="3" />
<point x="2" y1="0" />
<point x="2" y1="2" />
<point x="3" y1="3" />
</set>
</root>
---------------------------------------------
Desired Output
---------------------------------------------
<root id="theroot">
<set id="1">
<point x="1" y1="2" y2="2" y3="2"/>
<point x="1" y1="3" y2="5" y3="5"/>
<point x="1" y1="0" y2="5" y3="5"/>
<point x="1" y1="2" y2="7" y3="7"/>
<point x="1" y1="2" y2="9" y3="9"/>
<point x="2" y1="3" y2="3" y3="3"/>
<point x="2" y1="0" y2="3" y3="3"/>
<point x="2" y1="2" y2="5" y3="5"/>
<point x="3" y1="2" y2="2" y3="2"/>
<point x="3" y1="3" y2="5" y3="5"/>
<point x="3" y1="1" y2="6" y3="6"/>
<point x="3" y1="2" y2="8" y3="8"/>
<point x="3" y1="2" y2="10" y3="10"/>
</set>
<set id="2">
<point x="1" y1="2" y2="2" y3="11"/>
<point x="1" y1="3" y2="5" y3="14"/>
<point x="1" y1="0" y2="5" y3="14"/>
<point x="1" y1="2" y2="7" y3="16"/>
<point x="2" y1="2" y2="2" y3="7"/>
<point x="3" y1="2" y2="2" y3="12"/>
<point x="3" y1="2" y2="4" y3="14"/>
<point x="3" y1="2" y2="6" y3="16"/>
</set>
<set id="n">
<point x="1" y1="2" y2="2" y3="18"/>
<point x="1" y1="3" y2="5" y3="21"/>
<point x="1" y1="2" y2="7" y3="23"/>
<point x="2" y1="3" y2="3" y3="10"/>
<point x="2" y1="0" y2="3" y3="10"/>
<point x="2" y1="2" y2="5" y3="12"/>
<point x="3" y1="3" y2="3" y3="19"/>
</set>
</root>
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