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Re: grouping, sorting, splitting

2005-04-19 10:49:56
Many thanks to everyone who replied to help me out, the whole
pipelining things has been like a bright light in a dark corner.

Thanks again,
Stephen

On 4/19/05, Mukul Gandhi <mukul_gandhi(_at_)yahoo(_dot_)com> wrote:
I found another bug in my stylesheet.. (there was a
wrong <tr> tag appearing)..

Following is the modified stylesheet -

<?xml version="1.0"?>
<xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="1.0">

<xsl:output method="html" indent="yes" />

<xsl:key name="by-date" match="entry" use="@date" />

<xsl:template match="/page">
    <html>
      <head>
        <title/>
      </head>
      <body>
        <table>
          <xsl:for-each select="entry[generate-id() =
generate-id(key('by-date', @date)[1])]">
            <xsl:for-each select="key('by-date',
@date)">
              <xsl:sort select="title" />
              <xsl:if test="(position() = 1) or
((position() - 1) mod 3 = 0)">
                <xsl:variable name="pos"
select="position()" />
                <xsl:call-template name="generateTRs">
                  <xsl:with-param name="node-set"
select="key('by-date', @date)[position() >=
$pos][position() <= ($pos + 2)]" />
                </xsl:call-template>
              </xsl:if>
            </xsl:for-each>
            <!-- a dummy row -->
            <tr>
              <td>-</td><td>-</td><td>-</td>
            </tr>
          </xsl:for-each>
        </table>
      </body>
    </html>
</xsl:template>

<xsl:template name="generateTRs">
    <xsl:param name="node-set" />

    <tr>
      <xsl:for-each select="$node-set">
        <td>
          <xsl:value-of select="title" />
        </td>
      </xsl:for-each>
      <xsl:call-template name="generateRemainingTDs">
         <xsl:with-param name="n" select="3 -
count($node-set)" />
      </xsl:call-template>
    </tr>
</xsl:template>

<xsl:template name="generateRemainingTDs">
    <xsl:param name="n" />

    <xsl:if test="$n > 0">
      <td/>
      <xsl:call-template name="generateRemainingTDs">
        <xsl:with-param name="n" select="$n - 1" />
      </xsl:call-template>
    </xsl:if>
</xsl:template>

</xsl:stylesheet>

For e.g., when it is applied to XML -

<page>
  <entry date="2005-04-15">
    <title>foo</title>
  </entry>
  <entry date="2005-04-15">
    <title>bar</title>
  </entry>
  <entry date="2005-04-15">
    <title>baz</title>
  </entry>
  <entry date="2004-04-15">
    <title>a</title>
  </entry>
  <entry date="2004-04-15">
    <title>b</title>
  </entry>
  <entry date="2004-02-05">
    <title>c</title>
  </entry>
  <entry date="2003-04-15">
    <title>d</title>
  </entry>
  <entry date="2003-04-15">
    <title>e</title>
  </entry>
  <entry date="2003-02-05">
    <title>f</title>
  </entry>
  <entry date="2002-02-05">
    <title>g</title>
  </entry>
</page>

The output produced is -

<html>
   <head>
      <meta http-equiv="Content-Type"
content="text/html; charset=UTF-8">
      <title></title>
   </head>
   <body>
      <table>
         <tr>
            <td>foo</td>
            <td>bar</td>
            <td>baz</td>
         </tr>
         <tr>
            <td>-</td>
            <td>-</td>
            <td>-</td>
         </tr>
         <tr>
            <td>a</td>
            <td>b</td>
            <td></td>
         </tr>
         <tr>
            <td>-</td>
            <td>-</td>
            <td>-</td>
         </tr>
         <tr>
            <td>c</td>
            <td></td>
            <td></td>
         </tr>
         <tr>
            <td>-</td>
            <td>-</td>
            <td>-</td>
         </tr>
         <tr>
            <td>d</td>
            <td>e</td>
            <td></td>
         </tr>
         <tr>
            <td>-</td>
            <td>-</td>
            <td>-</td>
         </tr>
         <tr>
            <td>f</td>
            <td></td>
            <td></td>
         </tr>
         <tr>
            <td>-</td>
            <td>-</td>
            <td>-</td>
         </tr>
         <tr>
            <td>g</td>
            <td></td>
            <td></td>
         </tr>
         <tr>
            <td>-</td>
            <td>-</td>
            <td>-</td>
         </tr>
      </table>
   </body>
</html>

Regards,
Mukul


--- David Carlisle <davidc(_at_)nag(_dot_)co(_dot_)uk> wrote:

Actually we just said that it's better (for your
brain, if not for your
computer) to do it in two passes. I did explictly
note that since the
sorting criterion is pretty simple in this case, you
could probaby do it
in one pass.

David


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