As usual, there are many ways to handle this - here's one possibility. Not
extensively tested....
Basically I for-each through the sorted items once to build a white-space
delimited string of unique ids. I'm then going to do a sort of recursive
apply-templates - each time applying templates to the next item in my list,
and passing as parameters the total so far of c*d and the remaining ids in
the list. I think this means I'm only iterating through the nodes twice,
rather than N-1 times, which is presumably good.
sortsum.xml:
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="sortsum.xslt"?>
<root>
<item>
<a>1</a>
<b>2</b>
<c>2</c>
<d>7</d>
<sort>3</sort>
</item>
<item>
<a>2</a>
<b>3</b>
<c>5</c>
<d>8</d>
<sort>2</sort>
</item>
<item>
<a>3</a>
<b>4</b>
<c>1</c>
<d>2</d>
<sort>4</sort>
</item>
<item>
<a>4</a>
<b>5</b>
<c>2</c>
<d>9</d>
<sort>1</sort>
</item>
</root>
sortsum.xslt:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:output method="html"/>
<xsl:template match="/">
<table border="1" width="100%">
<tbody>
<tr>
<th>a</th><th>b</th><th>c</th><th>d</th><th>sort</th><th>a*b</th><th>c*d</th
<th>sum(c*d)</th>
</tr>
<xsl:variable name="nodelist">
<xsl:for-each select="//item">
<xsl:sort select="sort" data-type="number"/>
<xsl:value-of
select="concat(generate-id(.),' ')"/>
</xsl:for-each>
</xsl:variable>
<xsl:variable name="firstnode"
select="substring-before($nodelist,' ')"/>
<xsl:variable name="followingnodes"
select="substring-after($nodelist,' ')"/>
<xsl:apply-templates select="//item[generate-id(.) =
$firstnode]">
<xsl:with-param name="nodelist"
select="$followingnodes"/>
</xsl:apply-templates>
</tbody>
</table>
</xsl:template>
<xsl:template match="item">
<xsl:param name="totalsofar" select="0"/>
<xsl:param name="nodelist"/>
<tr>
<th>
<xsl:value-of select="a"/>
</th>
<th>
<xsl:value-of select="b"/>
</th>
<th>
<xsl:value-of select="c"/>
</th>
<th>
<xsl:value-of select="d"/>
</th>
<th>
<xsl:value-of select="sort"/>
</th>
<th>
<xsl:value-of select="a*b"/>
</th>
<th>
<xsl:value-of select="c*d"/>
</th>
<th>
<xsl:value-of select="(c*d) + $totalsofar"/>
</th>
<xsl:variable name="firstnode"
select="substring-before($nodelist,' ')"/>
<xsl:variable name="followingnodes"
select="substring-after($nodelist,' ')"/>
<xsl:apply-templates select="//item[generate-id(.) =
$firstnode]">
<xsl:with-param name="nodelist"
select="$followingnodes"/>
<xsl:with-param name="totalsofar" select="(c*d) +
$totalsofar"/>
</xsl:apply-templates>
</tr>
</xsl:template>
</xsl:stylesheet>
And the result is:
a b c d sort a*b c*d sum(c*d)
4 5 2 9 1 20 18 18
2 3 5 8 2 6 40 58
1 2 2 7 3 2 14 72
3 4 1 2 4 12 2 74
A very similar effect could probably be achieved using node-set.
David.
--
David McNally Moody's Investors Service
Software Engineer 99 Church St, NY NY 10007
David(_dot_)McNally(_at_)Moodys(_dot_)com (212) 553-7475
-----Original Message-----
From: Dan Diebolt [mailto:dandiebolt(_at_)yahoo(_dot_)com]
Sent: Wednesday, December 04, 2002 10:53 AM
To: xsl-list-digest(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: [xsl] a*b, sum(c*d), sorted on <sort>
Here is my XML:
<root>
<item><a>1</a><b>2</b><c>2</c><d>7</d><sort>3</sort></item>
<item><a>2</a><b>3</b><c>5</c><d>8</d><sort>2</sort></item>
<item><a>3</a><b>4</b><c>1</c><d>2</d><sort>4</sort></item>
<item><a>4</a><b>5</b><c>2</c><d>9</d><sort>1</sort></item>
</root>
For each <item> I need to produce a row containing
cells for a*b and cumulative c*d where the items
are taken sorted on <sort>:
+-----+----------+
| a*b | sum(c*d) |
+-----+----------+
| 20 | 18 |
+-----+----------+
| 6 | 58 |
+-----+----------+
| 2 | 72 |
+-----+----------+
| 12 | 74 |
+-----+----------+
The above a gross simplification, but I would like to get input from
people on how they would structure the problem as it has a lot
more detail in reality. In a nutshell, I have both recursive and
non-recursive calculations to perform in each row.
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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