Re: [xsl] Grouping question

[Jeni Tennison <jeni@xxxxxxxxxxxxxxxx>]

Bryan Schnabel wrote:
> While we wait for Jeni to give us the well-thought-out XSLT 1.0
> Meunchian method, here's some fun to consider with XSLT 2.0.
>
> Assuming your input is well formed (not </color>):
> <data>
>   <n color="R">1</n>
>   <n color="R">2</n>
>   <n color="R">3</n>
>   <n color="Y">4</n>
>   <n color="Y">5</n>
>   <n color="Y">6</n>
>   <n color="W">7</n>
>   <n color="W">8</n>
>   <n color="W">9</n>
> </data>
>
> Something like this would work:
>
> <xsl:template match="data">
>  <tables>
>   <xsl:for-each-group select="n" group-by="@color">
>     <xsl:sort select="." />
>      <table>
>       <xsl:for-each select="current-group()">
>        <xsl:if test="position() mod 2">
>         <xsl:variable name="color" select="@color" />
>         <tr>
>          <td>
>           <xsl:value-of select="." />
>          </td>
>          <xsl:if test="following-sibling::n[@color=$color]">
>           <td>
>            <xsl:value-of select="following-sibling::n[@color=$color]" />
>           </td>
>          </xsl:if>
>         </tr>
>        </xsl:if>
>       </xsl:for-each>
>      </table>
>   </xsl:for-each-group>
>  </tables>
> </xsl:template>

You could do the second level of grouping with xsl:for-each-group as
well. I *think* that this is the way to do it...

<xsl:template match="data">
  <tables>
    <xsl:for-each-group select="n" group-by="@color">
      <xsl:sort select="." />
      <table>
        <xsl:for-each-group select="current-group()"
            group-adjacent="ceiling(position() div 2)">
          <tr>
            <td>
              <xsl:value-of select="current-group()[1]" />
            </td>
            <td>
              <xsl:value-of select="current-group()[2]" />
            </td>
          </tr>
        </xsl:for-each-group>
      </table>
    </xsl:for-each-group>
  </tables>
</xsl:template>

Cheers,

Jeni

---
Jeni Tennison
http://www.jenitennison.com/


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