Thanks to all for the help. I'll work with these suggestions.
Peter
On Fri, May 21, 2010 at 5:50 PM, Imsieke, Gerrit, le-tex
<gerrit(_dot_)imsieke(_at_)le-tex(_dot_)de> wrote:
On 21.05.2010 23:09, Peter Desjardins wrote:
Can anyone point me to an example of that sort of stylesheet? One that
performs several types of grouping during the same pass over a
sequence of elements? Here's an example of the code I'm using. Both of
the grouping operations will work if I use them alone.
<xsl:template match = "body/div">
<xsl:for-each-group select = "current-group()" group-adjacent =
"name()='p' and @class='bulletedlist'">
<xsl:apply-templates select = "." mode = "itemizedlist" />
</xsl:for-each-group>
<!-- How do I perform both of these grouping operations at the
same time? -->
<xsl:for-each-group select = "*" group-starting-with =
"p[(_at_)class='head1']">
<xsl:apply-templates select="." mode="group-level-one"/>
</xsl:for-each-group>
</xsl:template>
It's ok to group in a single pass, but not at the same time. You should use
nested groupings. Section hierarchy (group-starting-with) comes first, then
the sections' contents will be grouped according to whether they are list
items or not.
Here's a sample XHTML body as input:
===========8<-----------------------
<?xml version="1.0" encoding="utf-8"?>
<body>
<p>pre</p>
<p class="bulletedlist">one</p>
<p class="bulletedlist">two</p>
<p class="bulletedlist">three</p>
<h5>This is h5</h5>
<h4>Attribution</h4>
<p>...</p>
<h3>Preface</h3>
<p class="orderedlist">1. one</p>
<p class="orderedlist">2. two</p>
<p class="bulletedlist">one</p>
<p class="bulletedlist">two</p>
<p class="bulletedlist">three</p>
<p class="orderedlist">3. three</p>
<h4>[Preface]</h4>
<p>...</p>
<h3>INTRODUCTION</h3>
<p>...</p>
<p class="bulletedlist">one</p>
<p class="bulletedlist">two</p>
<h5>baz</h5>
<p>foo</p>
</body>
===========8<-----------------------
Here's a stylesheet to process the input
===========8<-----------------------
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:xs="http://www.w3.org/2001/XMLSchema";
xmlns:my="my"
version="2.0"
exclude-result-prefixes="my xs"
>
<xsl:output method="xml" indent="yes" />
<xsl:template match="/">
<xsl:apply-templates/>
</xsl:template>
<xsl:template match="body">
<xsl:copy>
<xsl:sequence select="my:hierarchize(*)" />
</xsl:copy>
</xsl:template>
<xsl:function name="my:hierarchize" as="element(*)*">
<xsl:param name="nodes" as="element(*)*" />
<xsl:for-each-group select="$nodes"
group-starting-with="*[my:isHeading(.)][
my:hlevel(.) le min(
(
for $ph in (
preceding-sibling::*
intersect $nodes[my:isHeading(.)]
)
return my:hlevel($ph),
6
)
)
]">
<xsl:choose>
<xsl:when test="my:isHeading(.)">
<div class="level{my:hlevel(.)}">
<title>
<!-- please note that node() are all nodes of the context
item, which is the group's first element, i.e., the
heading: -->
<xsl:copy-of select="node()" />
</title>
<!-- will be called recursively: -->
<xsl:sequence
select="my:hierarchize(current-group()[position() gt 1])" />
</div>
</xsl:when>
<xsl:otherwise>
<!-- until no heading is in the nodes to process.
Then start processing the lists: -->
<xsl:sequence select="my:listify(current-group())" />
</xsl:otherwise>
</xsl:choose>
</xsl:for-each-group>
</xsl:function>
<xsl:function name="my:listify" as="element(*)*">
<xsl:param name="nodes" as="element(*)*" />
<xsl:for-each-group select="$nodes"
group-adjacent="boolean(self::p[(_at_)class='bulletedlist'])">
<xsl:choose>
<xsl:when test="current-grouping-key()">
<itemizedlist>
<xsl:sequence select="current-group()" />
</itemizedlist>
</xsl:when>
<xsl:otherwise>
<xsl:sequence select="current-group()" />
</xsl:otherwise>
</xsl:choose>
</xsl:for-each-group>
</xsl:function>
<xsl:function name="my:isHeading" as="xs:boolean">
<xsl:param name="elt" as="element(*)" />
<xsl:value-of select="matches(local-name($elt), '^h\d$')" />
</xsl:function>
<xsl:function name="my:hlevel" as="xs:double">
<xsl:param name="elt" as="element(*)" />
<xsl:value-of select="number(replace(local-name($elt), '^h(\d)$', '$1'))"
/>
</xsl:function>
</xsl:stylesheet>
===========8<-----------------------
Gerrit
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