I am looking for a clean way to do the following using XSLT.
Convert this source:
<para>blah blah</para>
<list>num1</list>
<list>num2</list>
<list>num3</list>
<para>blah blah</para>
<list>num1</list>
<list>num2</list>
<para>blah blah blah blah blah</para>
To this output:
<p>blah blah</p>
<ol>
<li>num1</li>
<li>num2</li>
<li>num3</li>
</ol>
<p>blah blah</p>
<ol>
<li>num1</li>
<li>num2</li>
</ol>
<p>blah blah blah blah blah</p>
Keep in mind I do not know exactly how many <list>
's there will be.
So far I have this:
<xsl:template match="para">
<p><xsl:value-of select="." /></p>
</xsl:template>
<xsl:template match="list">
<ol><li><xsl:value-of select="." /></li></ol>
</xsl:template>
But my output looks like this:
<p>blah blah</p>
<ol><li>num1</li></ol>
<ol><li>num2</li></ol>
<ol><li>num3</li></ol>
<p>blah blah</p>
<ol><li>num1</li></ol>
<ol><li>num2</li></ol>
<p>blah blah blah blah blah</p>
I know why I am getting duplicate <ol>
elements, but I do not know how to stop it. Quite a brain teaser.
Any help would be greatly appreciated.
This XSLT 1.0 stylesheet:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="node()">
<xsl:apply-templates select="node()[1]|following-sibling::node()[1]"/>
</xsl:template>
<xsl:template match="para">
<p>
<xsl:value-of select="."/>
</p>
<xsl:apply-templates select="following-sibling::node()[1]"/>
</xsl:template>
<xsl:template match="list[preceding-sibling::node()[1][not(self::list)]]">
<ol>
<xsl:call-template name="makeList"/>
</ol>
<xsl:apply-templates select="following-sibling::node()
[not(self::list)][1]"/>
</xsl:template>
<xsl:template match="list" name="makeList">
<li>
<xsl:value-of select="."/>
</li>
<xsl:apply-templates select="following-sibling::node()[1]
[self::list]"/>
</xsl:template>
</xsl:stylesheet>
Output:
<p>blah blah</p>
<ol>
<li>num1</li>
<li>num2</li>
<li>num3</li>
</ol>
<p>blah blah</p>
<ol>
<li>num1</li>
<li>num2</li>
</ol>
<p>blah blah blah blah blah</p>
Note: Fine grained traversal.
Edit: Compact code.
XSLT 2.0 has tools especially for this kind of Operations:
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="xml">
<xsl:for-each-group select="*" group-adjacent="boolean(self::list)">
<xsl:choose>
<xsl:when test="current-grouping-key()">
<ol>
<xsl:apply-templates select="current-group()"/>
</ol>
</xsl:when>
<xsl:otherwise>
<xsl:apply-templates select="current-group()"/>
</xsl:otherwise>
</xsl:choose>
</xsl:for-each-group>
</xsl:template>
<xsl:template match="para">
<p>
<xsl:apply-templates/>
</p>
</xsl:template>
<xsl:template match="list">
<li>
<xsl:apply-templates/>
</li>
</xsl:template>
</xsl:stylesheet>
With this XML:
<xml>
<para>blah blah</para>
<list>num1</list>
<list>num2</list>
<list>num3</list>
<para>blah blah</para>
<list>num1</list>
<list>num2</list>
<para>blah blah blah blah blah</para>
</xml>
You'll get the desired Output:
<p>blah blah</p>
<ol>
<li>num1</li>
<li>num2</li>
<li>num3</li>
</ol>
<p>blah blah</p>
<ol>
<li>num1</li>
<li>num2</li>
</ol>
<p>blah blah blah blah blah</p>
You should read up on for-each-group at http://www.w3.org/TR/xslt20/#xsl-for-each-group
This transformation :
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output omit-xml-declaration="yes" indent="yes"/>
<xsl:key name="kFollowing" match="list"
use="generate-id(preceding-sibling::para[1])"/>
<xsl:template match="node()|@*" name="identity">
<xsl:copy>
<xsl:apply-templates select="node()|@*"/>
</xsl:copy>
</xsl:template>
<xsl:template match="para">
<p>
<xsl:apply-templates/>
</p>
<xsl:variable name="vFol"
select="key('kFollowing',generate-id())"/>
<xsl:if test="$vFol">
<ol>
<xsl:apply-templates mode="copy"
select="key('kFollowing',generate-id())"/>
</ol>
</xsl:if>
</xsl:template>
<xsl:template match="list" mode="copy">
<li><xsl:value-of select="."/></li>
</xsl:template>
<xsl:template match="list"/>
</xsl:stylesheet>
when applied on the following XML document (wrapping the provided input in a single top element):
<t>
<para>blah blah</para>
<list>num1</list>
<list>num2</list>
<list>num3</list>
<para>blah blah</para>
<list>num1</list>
<list>num2</list>
<para>blah blah blah blah blah</para>
</t>
produces the wanted, correct result :
<t>
<p>blah blah</p>
<ol>
<li>num1</li>
<li>num2</li>
<li>num3</li>
</ol>
<p>blah blah</p>
<ol>
<li>num1</li>
<li>num2</li>
</ol>
<p>blah blah blah blah blah</p>
</t>
UPDATE : The OP has indicated in a comment that now he wants a solution where any non- list
element can delimit a group of adjacent list
siblings.
Here is the solution to the changed question :
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output omit-xml-declaration="yes" indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:key name="kFollowing" match="list"
use="generate-id(preceding-sibling::*[not(self::list)][1])"/>
<xsl:template match="node()|@*" name="identity">
<xsl:copy>
<xsl:apply-templates select="node()|@*"/>
</xsl:copy>
</xsl:template>
<xsl:template match="*[not(self::list) and following-sibling::*[1][self::list]]">
<xsl:call-template name="identity"/>
<xsl:variable name="vFol"
select="key('kFollowing',generate-id())"/>
<xsl:if test="$vFol">
<ol>
<xsl:apply-templates mode="copy"
select="key('kFollowing',generate-id())"/>
</ol>
</xsl:if>
</xsl:template>
<xsl:template match="list" mode="copy">
<li><xsl:value-of select="."/></li>
</xsl:template>
<xsl:template match="list"/>
</xsl:stylesheet>
When this transformation is applied on the following XML document (Note that the separating elements have now random names):
<t>
<bara>blah blah</bara>
<list>num1</list>
<list>num2</list>
<list>num3</list>
<vara>blah blah</vara>
<list>num1</list>
<list>num2</list>
<dara>blah blah blah blah blah</dara>
</t>
the wanted, correct result is produced :
<t>
<bara>blah blah</bara>
<ol>
<li>num1</li>
<li>num2</li>
<li>num3</li>
</ol>
<vara>blah blah</vara>
<ol>
<li>num1</li>
<li>num2</li>
</ol>
<dara>blah blah blah blah blah</dara>
</t>
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