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Re: [xsl] grouping, sorting, splitting


Subject: Re: [xsl] grouping, sorting, splitting
From: beowulf <carisenda@xxxxxxxxx>
Date: Tue, 19 Apr 2005 18:49:56 +0100

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@xxxxxxxxx> 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@xxxxxxxxx> 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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