Thanks, Dimitre.
Two questions -
a) Will this work with .Net 2.0?
b) What are the external files : func-scanlDVC.xsl and func-Operators.xsl?
Simon
-----Original Message-----
From: Dimitre Novatchev [mailto:dnovatchev(_at_)gmail(_dot_)com]
Sent: February 3, 2007 2:50 PM
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: Re: [xsl] Calculating cumulative values
On 2/3/07, Andrew Welch <andrew(_dot_)j(_dot_)welch(_at_)gmail(_dot_)com> wrote:
You can just use XPath here, no need for recursion:
<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:copy>
</xsl:template>
However evaluating this XPath expression repeatedly is O(N^2) and will
probably be slow for long lists.
Here is a solution, using the FXSL function
f:scanl1()
This transformation:
<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="../f/func-scanlDVC.xsl"/>
<xsl:import href="../f/func-Operators.xsl"/>
<!-- To be applied on testFunc-scanlDVC3.xml -->
<xsl:output omit-xml-declaration="yes" indent="yes"/>
<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:for-each select="f:scanl1(f:add(), current-group()/@y1)">
<point x="{current-group()[1]/@x}" y="{.}"/>
</xsl:for-each>
</xsl:for-each-group>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
When applied against the originally provided xml document:
<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>
produces the wanted result:
<root id="theroot">
<set id="1">
<point x="1" y="2"/>
<point x="1" y="5"/>
<point x="1" y="5"/>
<point x="1" y="7"/>
<point x="1" y="9"/>
<point x="2" y="3"/>
<point x="2" y="3"/>
<point x="2" y="5"/>
<point x="3" y="2"/>
<point x="3" y="5"/>
<point x="3" y="6"/>
<point x="3" y="8"/>
<point x="3" y="10"/>
</set>
<set id="2">
<point x="1" y="2"/>
<point x="1" y="5"/>
<point x="1" y="5"/>
<point x="1" y="7"/>
<point x="2" y="2"/>
<point x="3" y="2"/>
<point x="3" y="4"/>
<point x="3" y="6"/>
</set>
<set id="n">
<point x="1" y="2"/>
<point x="1" y="5"/>
<point x="1" y="7"/>
<point x="2" y="3"/>
<point x="2" y="3"/>
<point x="2" y="5"/>
<point x="3" y="3"/>
</set>
</root>
--
Cheers,
Dimitre Novatchev
---------------------------------------
Truly great madness cannot be achieved without significant intelligence.
---------------------------------------
To invent, you need a good imagination and a pile of junk
-------------------------------------
You've achieved success in your field when you don't know whether what
you're doing is work or play
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