Subject: Re: Grouping a sequence of elements in different ways in the same stylesheet
From: Peter Desjardins <peter.desjardins.us@xxxxxxxxx>
Date: Mon, 24 May 2010 11:53:43 -0400
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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.imsieke@xxxxxxxxx> 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[@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="$nodes"
> group-adjacent="boolean(self::p[@class='bulletedlist'])">
> <xsl:choose>
> <xsl:when test="current-grouping-key()">
> <itemizedlist>
> <xsl:sequence select="current-group()" />
> </itemizedlist>
> </xsl:when>
> <xsl:otherwise>
> <xsl:sequence select="current-group()" />
> </xsl:otherwise>
> </xsl:choose>
> </xsl:for-each-group>
> </xsl:function>
>
> <xsl:function name="my:isHeading" as="xs:boolean">
> <xsl:param name="elt" as="element(*)" />
> <xsl:value-of select="matches(local-name($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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