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Re: [xsl] A grouping question ?
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Subject: Re: [xsl] A grouping question ? From: Jeni Tennison <jeni@xxxxxxxxxxxxxxxx> Date: Fri, 31 Oct 2003 13:25:45 +0000 |
Hi Emilio,
> I have a XML file such as:
>
> <Content>
> <Paragraph bullet='false'>
> <Text txt='Hello World'/>
> </Paragraph>
> <Paragraph bullet='true'>
> <Text txt='First Bulleted Hello World'/>
> </Paragraph>
> <Paragraph bullet='true'>
> <Text txt='Second Bulleted Hello World'/>
> </Paragraph>
> <Paragraph bullet='false'>
> <Text txt='A normal line of text'/>
> </Paragraph>
> <Paragraph bullet='true'>
> <Text txt='Another bulleted line'/>
> </Paragraph>
> <Paragraph bullet='true'>
> <Text txt='A second bulleted line'/>
> </Paragraph>
> </Content>
>
> And I want an HTML output like the following:
>
> <html>
> <p>Hello World</p>
> <ul>
> <li>First Bulleted Hello World</li>
> <li>Second Bulleted Hello World</li>
> </ul>
> <p>A normal line of text</p>
> <ul>
> <li>Another bulleted line</li>
> <li>A second bulleted line</li>
> </ul>
> </html>
This *is* a grouping problem, though you're right that it's not a
"normal" one. In fact, it's very similar to Dave Holden's "flattening"
problem, and I'd approach it the same way, by stepping through the
<Paragraph> elements one by one:
<xsl:template match="Content">
<html>
<!-- only apply templates to first Paragraph -->
<xsl:apply-templates select="Paragraph[1]" />
</html>
</xsl:template>
<xsl:template match="Paragraph[@bullet = 'false']">
<!-- create p element -->
<p>
<xsl:apply-templates />
</p>
<!-- step on to next Paragraph element -->
<xsl:apply-templates select="following-sibling::Paragraph[1]" />
</xsl:template>
<xsl:template match="Paragraph[@bullet = 'true']">
<!-- create ul element -->
<ul>
<!-- populate by applying templates in item mode -->
<xsl:apply-templates select="." mode="item" />
</ul>
<!-- step on to next non-bulleted Paragraph -->
<xsl:apply-templates
select="following-sibling::Paragraph[@bullet = 'false'][1]" />
</xsl:template>
<xsl:template match="Paragraph[@bullet = 'true']" mode="item">
<!-- create list item -->
<li>
<xsl:apply-templates />
</li>
<!-- step on to next Paragraph -->
<xsl:apply-templates select="following-sibling::Paragraph[1]"
mode="item" />
</xsl:template>
<!-- do nothing -->
<xsl:template match="Paragraph[@bullet = 'false']" mode="item" />
<xsl:template match="Text">
<xsl:value-of select="@txt" />
</xsl:template>
It's a lot easier in XSLT 2.0:
<xsl:template match="Content">
<html>
<xsl:for-each-group select="Paragraph"
group-adjacent="@bullet">
<xsl:choose>
<xsl:when test="@bullet = 'false'">
<xsl:apply-templates select="current-group()" />
</xsl:when>
<xsl:otherwise>
<ul>
<xsl:apply-templates select="current-group()" />
</ul>
</xsl:otherwise>
</xsl:choose>
</xsl:for-each-group>
</html>
</xsl:template>
<xsl:template match="Paragraph[@bullet = 'false']">
<p><xsl:apply-templates /></p>
</xsl:template>
<xsl:template match="Paragraph[@bullet = 'true']">
<li><xsl:apply-templates /></li>
</xsl:template>
<xsl:template match="Text">
<xsl:value-of select="@txt" />
</xsl:template>
Cheers,
Jeni
---
Jeni Tennison
http://www.jenitennison.com/
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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